const std = @import("std");
const Allocator = std.mem.Allocator;
const assert = std.debug.assert;

const data_structures = @import("../library.zig");
const UnpinnedArray = data_structures.UnpinnedArray;
const BlockList = data_structures.BlockList;
const enumFromString = data_structures.enumFromString;

const lexer = @import("lexer.zig");

const Compilation = @import("../Compilation.zig");
const write = Compilation.write;
const logln = Compilation.logln;
const Token = Compilation.Token;

pub const Result = struct {
    main_node_index: Node.Index,
    time: u64,
};

pub const Logger = enum {
    file,
    token_errors,
    symbol_declaration,
    node_creation,
    node_creation_detailed,
    main_node,
    container_members,
    block,
    assign,
    suffix,
    precedence,
    @"switch",
    pointer_like_type_expression,
    switch_case,
    consume_token,

    pub var bitset = std.EnumSet(Logger).initMany(&.{
        .file,
        .token_errors,
        .symbol_declaration,
        .node_creation,
        // .node_creation_detailed,
        .main_node,
        .container_members,
        .block,
        .assign,
        .suffix,
        .precedence,
        .@"switch",
        .pointer_like_type_expression,
        .switch_case,
        .consume_token,
    });
};

// TODO: pack it to be more efficient
pub const Node = struct {
    left: Node.Index,
    right: Node.Index,
    token: Token.Index,
    id: Id,

    pub const List = BlockList(@This(), enum {});
    pub usingnamespace List.Index;

    pub const Range = struct {
        start: u32,
        end: u32,
    };

    pub const Id = enum {
        main,
        identifier,
        number,
        @"return",
        function_declaration_no_arguments,
        container_declaration,
        string_literal,
        constant_symbol_declaration,
        variable_symbol_declaration,
        assign,
        @"comptime",
        node_list,
        @"while",
        function_prototype,
        function_definition,
        keyword_noreturn,
        keyword_true,
        number_literal,
        @"unreachable",
        field_access,
        comptime_block,
        block,
        unsigned_integer_type,
        signed_integer_type,
        slice_type,
        array_type,
        argument_declaration,
        intrinsic,
        ssize_type,
        usize_type,
        void_type,
        call,
        pointer_type,
        dot_literal,
        address_of,
        pointer_dereference,
        keyword_false,
        compare_equal,
        compare_not_equal,
        compare_less,
        compare_greater,
        compare_less_equal,
        compare_greater_equal,
        @"if",
        if_else,
        @"switch",
        switch_case,
        enum_type,
        enum_field,
        extern_qualifier,
        export_qualifier,
        add,
        sub,
        mul,
        div,
        mod,
        bit_and,
        bit_xor,
        expression_group,
        bit_or,
        shift_left,
        shift_right,
        add_assign,
        sub_assign,
        mul_assign,
        div_assign,
        mod_assign,
        discarded_assign,
        bool_type,
        named_argument,
        optional_type,
        container_field,
        struct_type,
        container_literal,
        container_field_initialization,
        array_index_initialization,
        boolean_not,
        null_literal,
        if_else_payload,
        if_payload,
        discard,
        slice,
        range,
        negation,
        anonymous_container_literal,
        anonymous_array_literal,
        array_literal,
        indexed_access,
        calling_convention,
        assembly_register,
        assembly_statement,
        // assembly_block,
        for_condition,
        for_loop,
        undefined,
        zero_terminated,
        null_terminated,
        const_expression,
        many_pointer_expression,
        optional_unwrap,
        anonymous_empty_literal,
        empty_container_literal_guess,
        break_expression,
        character_literal,
        function_attribute_naked,
        function_attribute_cc,
        symbol_attribute_extern,
        symbol_attribute_export,
        symbol_attributes,
        metadata,
        test_declaration,
        all_errors,
        error_union,
        catch_expression,
        try_expression,
        error_type,
        error_field,
        assembly_code_expression,
        assembly_instruction,
        assembly_code_block,
        bool_and,
        bool_or,
        payload,
        catch_payload,
        bitfield_type,
        comptime_expression,
    };
};

const Error = error{
    unexpected_token,
    not_implemented,
    OutOfMemory,
};

const Analyzer = struct {
    lexer: lexer.Result,
    token_i: Token.Index,
    token_buffer: *Token.Buffer,
    nodes: *Node.List,
    node_lists: *UnpinnedArray(UnpinnedArray(Node.Index)),
    source_file: []const u8,
    allocator: Allocator,
    my_allocator: *data_structures.MyAllocator,
    suffix_depth: usize = 0,

    fn expectToken(analyzer: *Analyzer, expected_token_id: Token.Id) !Token.Index {
        const token_i = analyzer.token_i;
        const token_id = analyzer.peekToken();
        const is_expected_token = token_id == expected_token_id;
        if (is_expected_token) {
            analyzer.consumeToken();
            const result = token_i;
            return result;
        } else {
            const file_offset = analyzer.getTokenOffset(token_i);
            const file_chunk = analyzer.source_file[file_offset..];
            try write(.panic, "Unexpected token ");
            try write(.panic, @tagName(token_id));
            try write(.panic, " when expected ");
            try write(.panic, @tagName(expected_token_id));
            try write(.panic, "\n");
            try write(.panic, "File chunk:\n\n```\n");
            try write(.panic, file_chunk);
            try write(.panic, "\n```\n");
            // std.debug.print("Unexpected token {s} when expected {s}\n| |\n v \n```\n{s}\n```", .{ @tagName(token_id), @tagName(expected_token_id), file_chunk });
            @breakpoint();
            return error.unexpected_token;
        }
    }

    fn getTokenOffset(analyzer: *Analyzer, token_index: Token.Index) u32 {
        const index = Token.unwrap(token_index);
        assert(index < analyzer.token_buffer.length);
        const offset = analyzer.token_buffer.offsets[index];
        return offset;
    }

    fn peekTokenAhead(analyzer: *Analyzer, ahead_offset: u32) Token.Id {
        const token_index = Token.addInt(analyzer.token_i, ahead_offset);
        const index = Token.unwrap(token_index);
        assert(index < analyzer.token_buffer.length);
        const token = analyzer.token_buffer.ids[index];
        return token;
    }

    fn peekToken(analyzer: *Analyzer) Token.Id {
        const token = analyzer.peekTokenAhead(0);
        return token;
    }

    fn hasTokens(analyzer: *Analyzer) bool {
        const token_end = analyzer.getTokenEnd();
        return Token.unwrap(analyzer.token_i) < token_end;
    }

    fn getTokenEnd(analyzer: *const Analyzer) u32 {
        return @intFromEnum(Token.addInt(analyzer.lexer.offset, analyzer.lexer.count));
    }

    fn consumeToken(analyzer: *Analyzer) void {
        analyzer.consumeTokens(1);
    }

    fn consumeTokens(analyzer: *Analyzer, token_count: u32) void {
        assert(Token.unwrap(Token.addInt(analyzer.token_i, token_count)) <= analyzer.getTokenEnd());
        // log(.parser, .consume_token, "Consuming {} {s}: ", .{ token_count, if (token_count == 1) "token" else "tokens" });

        for (0..token_count) |i_usize| {
            const i: u32 = @intCast(i_usize);
            const token_id = analyzer.peekTokenAhead(i);
            _ = token_id; // autofix
            const token_index = Token.addInt(analyzer.token_i, i);
            const token_bytes = analyzer.bytes(token_index);
            _ = token_bytes; // autofix
            // log(.parser, .consume_token, "{s}, '{s}'", .{ @tagName(token_id), token_bytes });
        }

        // log(.parser, .consume_token, "\n", .{});
        analyzer.token_i = Token.addInt(analyzer.token_i, token_count);
    }

    fn bytes(analyzer: *const Analyzer, token_index: Token.Index) []const u8 {
        const index = Token.unwrap(token_index);
        assert(index < analyzer.token_buffer.length);
        const offset = analyzer.token_buffer.offsets[index];
        const len = analyzer.token_buffer.lengths[index];
        const slice = analyzer.source_file[offset..][0..len];
        return slice;
    }

    fn symbolDeclaration(analyzer: *Analyzer) anyerror!Node.Index {
        const first = analyzer.token_i;
        const mutability_node_id: Node.Id = switch (analyzer.peekToken()) {
            .fixed_keyword_var => .variable_symbol_declaration,
            .fixed_keyword_const => .constant_symbol_declaration,
            else => |t| @panic(@tagName(t)),
        };
        analyzer.consumeToken();
        const declaration_name_token = try analyzer.expectToken(.identifier);
        const declaration_name = analyzer.bytes(declaration_name_token);
        _ = declaration_name; // autofix
        // logln(.parser, .symbol_declaration, "Starting parsing declaration \"{s}\"", .{declaration_name});

        // logln(.parser, .symbol_declaration, "Current token: {}", .{analyzer.peekToken()});

        const metadata_node_index = switch (analyzer.peekToken()) {
            .operator_colon => blk: {
                const colon = try analyzer.expectToken(.operator_colon);
                const type_node_index = if (analyzer.peekToken() != .operator_colon) try analyzer.typeExpression() else .null;
                const attribute_node_index: Node.Index = if (analyzer.peekToken() == .operator_colon) b: {
                    analyzer.consumeToken();

                    var list = UnpinnedArray(Node.Index){};
                    while (analyzer.peekToken() != .operator_assign) {
                        const identifier = try analyzer.expectToken(.identifier);
                        const identifier_name = analyzer.bytes(identifier);

                        const attribute_node = inline for (@typeInfo(Compilation.Debug.Declaration.Global.Attribute).Enum.fields) |enum_field| {
                            if (data_structures.byte_equal(identifier_name, enum_field.name)) {
                                const attribute = @field(Compilation.Debug.Declaration.Global.Attribute, enum_field.name);
                                const attribute_node = switch (attribute) {
                                    .@"export",
                                    .@"extern",
                                    => try analyzer.addNode(.{
                                        .id = @field(Node.Id, "symbol_attribute_" ++ @tagName(attribute)),
                                        .token = identifier,
                                        .left = .null,
                                        .right = .null,
                                    }),
                                };
                                break attribute_node;
                            }
                        } else @panic(identifier_name);
                        try list.append(analyzer.my_allocator, attribute_node);

                        switch (analyzer.peekToken()) {
                            .operator_assign => {},
                            .operator_comma => analyzer.consumeToken(),
                            else => |t| @panic(@tagName(t)),
                        }
                    }

                    break :b try analyzer.nodeList(list);
                } else .null;

                break :blk try analyzer.addNode(.{
                    .id = .metadata,
                    .token = colon,
                    .left = type_node_index,
                    .right = attribute_node_index,
                });
            },
            else => Node.Index.null,
        };

        _ = try analyzer.expectToken(.operator_assign);

        const init_node_index = try analyzer.expression();

        const init_node = analyzer.nodes.get(init_node_index);
        switch (init_node.id) {
            .function_definition => {},
            else => _ = try analyzer.expectToken(.operator_semicolon),
        }

        // TODO:
        const declaration = Node{
            .id = mutability_node_id,
            .token = first,
            .left = metadata_node_index,
            .right = init_node_index,
        };

        // logln(.parser, .symbol_declaration, "Adding declaration \"{s}\" with init node of type: {s}", .{ declaration_name, @tagName(init_node.id) });

        return try analyzer.addNode(declaration);
    }

    fn function(analyzer: *Analyzer) !Node.Index {
        const token = analyzer.token_i;
        assert(analyzer.peekToken() == .fixed_keyword_fn);
        analyzer.consumeToken();
        const function_prototype = try analyzer.functionPrototype();
        const is_comptime = false;
        _ = is_comptime;
        return switch (analyzer.peekToken()) {
            .operator_left_brace => try analyzer.addNode(.{
                .id = .function_definition,
                .token = token,
                .left = function_prototype,
                .right = try analyzer.block(),
            }),
            .operator_semicolon => function_prototype,
            else => |t| @panic(@tagName(t)),
        };
    }

    fn functionPrototype(analyzer: *Analyzer) !Node.Index {
        const token = analyzer.token_i;
        var attribute_and_return_type_node_list = UnpinnedArray(Node.Index){};

        while (analyzer.peekToken() != .operator_left_parenthesis) {
            const identifier = try analyzer.expectToken(.identifier);
            const identifier_name = analyzer.bytes(identifier);

            const attribute_node = inline for (@typeInfo(Compilation.Function.Attribute).Enum.fields) |enum_field| {
                if (data_structures.byte_equal(identifier_name, enum_field.name)) {
                    const attribute = @field(Compilation.Function.Attribute, enum_field.name);
                    const attribute_node = switch (attribute) {
                        .naked => try analyzer.addNode(.{
                            .id = @field(Node.Id, "function_attribute_" ++ @tagName(attribute)),
                            .token = identifier,
                            .left = .null,
                            .right = .null,
                        }),
                        .cc => try analyzer.addNode(.{
                            .id = .function_attribute_cc,
                            .token = identifier,
                            .left = b: {
                                _ = try analyzer.expectToken(.operator_left_parenthesis);
                                const cc = try analyzer.expression();
                                _ = try analyzer.expectToken(.operator_right_parenthesis);
                                break :b cc;
                            },
                            .right = .null,
                        }),
                        else => |t| @panic(@tagName(t)),
                    };
                    break attribute_node;
                }
            } else @panic(identifier_name);

            try attribute_and_return_type_node_list.append(analyzer.my_allocator, attribute_node);

            if (analyzer.peekToken() == .operator_comma) analyzer.consumeToken();
        }

        assert(analyzer.peekToken() == .operator_left_parenthesis);

        const arguments = try analyzer.argumentList(.operator_left_parenthesis, .operator_right_parenthesis);
        const return_type = try analyzer.typeExpression();
        try attribute_and_return_type_node_list.append(analyzer.my_allocator, return_type);

        const function_prototype = try analyzer.addNode(.{
            .id = .function_prototype,
            .token = token,
            .left = arguments,
            .right = try analyzer.nodeList(attribute_and_return_type_node_list),
        });

        return function_prototype;
    }

    fn argumentList(analyzer: *Analyzer, maybe_start_token: ?Token.Id, end_token: Token.Id) !Node.Index {
        if (maybe_start_token) |start_token| {
            _ = try analyzer.expectToken(start_token);
        }

        var list = UnpinnedArray(Node.Index){};

        while (analyzer.peekToken() != end_token) {
            const identifier_token = analyzer.token_i;
            switch (analyzer.peekToken()) {
                .identifier, .discard => analyzer.consumeToken(),
                else => |t| @panic(@tagName(t)),
            }
            _ = try analyzer.expectToken(.operator_colon);
            const type_expression = try analyzer.typeExpression();

            if (analyzer.peekToken() == .operator_comma) {
                analyzer.consumeToken();
            }

            try list.append(analyzer.my_allocator, try analyzer.addNode(.{
                .id = .argument_declaration,
                .token = identifier_token,
                .left = type_expression,
                .right = Node.Index.null,
            }));
        }

        _ = try analyzer.expectToken(end_token);

        if (list.length != 0) {
            return try analyzer.nodeList(list);
        } else {
            return Node.Index.null;
        }
    }

    fn assignExpressionStatement(analyzer: *Analyzer) !Node.Index {
        const result = try analyzer.assignExpression();
        _ = try analyzer.expectToken(.operator_semicolon);
        return result;
    }

    fn block(analyzer: *Analyzer) anyerror!Node.Index {
        const left_brace = try analyzer.expectToken(.operator_left_brace);
        var list = UnpinnedArray(Node.Index){};

        while (analyzer.peekToken() != .operator_right_brace) {
            const first_statement_token = analyzer.peekToken();
            // logln(.parser, .block, "First statement token: {s}", .{@tagName(first_statement_token)});
            const statement_index = switch (first_statement_token) {
                else => try analyzer.assignExpressionStatement(),

                .fixed_keyword_while => try analyzer.whileExpression(),
                .fixed_keyword_switch => try analyzer.switchExpression(),
                .fixed_keyword_if => try analyzer.ifExpression(),
                .fixed_keyword_for => try analyzer.forExpression(),
                .fixed_keyword_const,
                .fixed_keyword_var,
                => try analyzer.symbolDeclaration(),
            };

            try list.append(analyzer.my_allocator, statement_index);
        }

        _ = try analyzer.expectToken(.operator_right_brace);

        return try analyzer.addNode(.{
            .id = .block,
            .token = left_brace,
            .left = try analyzer.nodeList(list),
            .right = Node.Index.null,
        });
    }

    fn whileExpression(analyzer: *Analyzer) anyerror!Node.Index {
        const while_identifier_index = try analyzer.expectToken(.fixed_keyword_while);

        _ = try analyzer.expectToken(.operator_left_parenthesis);
        // TODO:
        const while_condition = try analyzer.expression();
        _ = try analyzer.expectToken(.operator_right_parenthesis);

        const while_block = try analyzer.block();

        return analyzer.addNode(.{
            .id = .@"while",
            .token = while_identifier_index,
            .left = while_condition,
            .right = while_block,
        });
    }

    fn switchExpression(analyzer: *Analyzer) anyerror!Node.Index {
        // logln(.parser, .@"switch", "Parsing switch...", .{});
        const switch_token = analyzer.token_i;
        analyzer.consumeToken();
        _ = try analyzer.expectToken(.operator_left_parenthesis);
        const switch_expression = try analyzer.expression();
        _ = try analyzer.expectToken(.operator_right_parenthesis);
        // logln(.parser, .@"switch", "Parsed switch expression...", .{});
        _ = try analyzer.expectToken(.operator_left_brace);

        var list = UnpinnedArray(Node.Index){};

        while (analyzer.peekToken() != .operator_right_brace) {
            const case_token = analyzer.token_i;
            // logln(.parser, .@"switch", "Parsing switch case...", .{});
            const case_node = switch (analyzer.peekToken()) {
                .fixed_keyword_else => blk: {
                    analyzer.consumeToken();
                    break :blk Node.Index.null;
                },
                else => blk: {
                    var array_list = UnpinnedArray(Node.Index){};
                    while (true) {
                        const switch_case_node = try analyzer.expression();
                        try array_list.append(analyzer.my_allocator, switch_case_node);
                        switch (analyzer.peekToken()) {
                            .operator_comma => analyzer.consumeToken(),
                            .operator_switch_case => break,
                            else => {},
                        }
                    }

                    break :blk switch (array_list.length) {
                        0 => unreachable,
                        1 => array_list.pointer[0],
                        else => try analyzer.nodeList(array_list),
                    };
                },
            };
            _ = try analyzer.expectToken(.operator_switch_case);
            const is_left_brace = analyzer.peekToken() == .operator_left_brace;
            const expr = switch (is_left_brace) {
                true => try analyzer.block(),
                false => try analyzer.assignExpression(),
            };

            // logln(.parser, .switch_case, "Comma token: \n```\n{s}\n```\n", .{analyzer.source_file[analyzer.tokens[analyzer.token_i].start..]});
            _ = try analyzer.expectToken(.operator_comma);

            const node = try analyzer.addNode(.{
                .id = .switch_case,
                .token = case_token,
                .left = case_node,
                .right = expr,
            });

            try list.append(analyzer.my_allocator, node);
        }

        _ = try analyzer.expectToken(.operator_right_brace);

        return try analyzer.addNode(.{
            .id = .@"switch",
            .token = switch_token,
            .left = switch_expression,
            .right = try analyzer.nodeList(list),
        });
    }

    fn parsePayload(analyzer: *Analyzer) !Node.Index {
        _ = try analyzer.expectToken(.operator_bar);
        const main_token = analyzer.token_i;
        switch (analyzer.peekToken()) {
            .identifier,
            .discard,
            => analyzer.consumeToken(),
            else => |t| @panic(@tagName(t)),
        }

        _ = try analyzer.expectToken(.operator_bar);

        return try analyzer.addNode(.{
            .id = .payload,
            .token = main_token,
            .left = .null,
            .right = .null,
        });
    }

    fn ifExpression(analyzer: *Analyzer) anyerror!Node.Index {
        const if_token = analyzer.token_i;
        analyzer.consumeToken();

        _ = try analyzer.expectToken(.operator_left_parenthesis);
        const if_condition = try analyzer.expression();
        _ = try analyzer.expectToken(.operator_right_parenthesis);

        const payload = if (analyzer.peekToken() == .operator_bar) try analyzer.parsePayload() else Node.Index.null;

        const if_taken_expression = try analyzer.expression();

        const if_node = try analyzer.addNode(.{
            .id = .@"if",
            .token = if_token,
            .left = if_condition,
            .right = if_taken_expression,
        });

        const result = switch (analyzer.peekToken()) {
            .fixed_keyword_else => blk: {
                analyzer.consumeToken();

                break :blk try analyzer.addNode(.{
                    .id = .if_else,
                    .token = if_token,
                    .left = if_node,
                    .right = try analyzer.expression(),
                });
            },
            else => if_node,
        };

        if (payload == .null) {
            return result;
        } else {
            return try analyzer.addNode(.{
                .id = switch (result == if_node) {
                    true => .if_payload,
                    false => .if_else_payload,
                },
                .token = if_token,
                .left = result,
                .right = payload,
            });
        }
    }

    fn forExpression(analyzer: *Analyzer) !Node.Index {
        const token = try analyzer.expectToken(.fixed_keyword_for);
        _ = try analyzer.expectToken(.operator_left_parenthesis);

        var for_expression_list = UnpinnedArray(Node.Index){};

        while (analyzer.peekToken() != .operator_right_parenthesis) {
            const expression_token = analyzer.token_i;
            const first = try analyzer.expression();

            const node_index = switch (analyzer.peekToken()) {
                .operator_dot => switch (analyzer.peekTokenAhead(1)) {
                    .operator_dot => blk: {
                        analyzer.consumeTokens(2);

                        break :blk try analyzer.addNode(.{
                            .id = .range,
                            .token = expression_token,
                            .left = first,
                            .right = switch (analyzer.peekToken()) {
                                .operator_right_parenthesis, .operator_comma => Node.Index.null,
                                else => try analyzer.expression(),
                            },
                        });
                    },
                    else => |t| @panic(@tagName(t)),
                },
                .operator_right_parenthesis,
                .operator_comma,
                => first,
                else => |t| @panic(@tagName(t)),
            };

            try for_expression_list.append(analyzer.my_allocator, node_index);

            switch (analyzer.peekToken()) {
                .operator_comma => analyzer.consumeToken(),
                .operator_right_parenthesis => {},
                else => |t| @panic(@tagName(t)),
            }
        }

        _ = try analyzer.expectToken(.operator_right_parenthesis);

        _ = try analyzer.expectToken(.operator_bar);

        var payload_nodes = UnpinnedArray(Node.Index){};

        while (analyzer.peekToken() != .operator_bar) {
            const payload_token = analyzer.token_i;
            const id: Node.Id = switch (analyzer.peekToken()) {
                .identifier => .identifier,
                .discard => .discard,
                else => |t| @panic(@tagName(t)),
            };

            analyzer.consumeToken();

            switch (analyzer.peekToken()) {
                .operator_bar => {},
                .operator_comma => analyzer.consumeToken(),
                else => |t| @panic(@tagName(t)),
            }

            try payload_nodes.append(analyzer.my_allocator, try analyzer.addNode(.{
                .id = id,
                .token = payload_token,
                .left = Node.Index.null,
                .right = Node.Index.null,
            }));
        }

        _ = try analyzer.expectToken(.operator_bar);

        if (payload_nodes.length != for_expression_list.length) {
            unreachable;
        }

        const for_condition_node = try analyzer.addNode(.{
            .id = .for_condition,
            .token = token,
            .left = try analyzer.nodeList(for_expression_list),
            .right = try analyzer.nodeList(payload_nodes),
        });

        const for_content_node = switch (analyzer.peekToken()) {
            .operator_left_brace => try analyzer.block(),
            else => blk: {
                const for_content_expression = try analyzer.expression();
                _ = try analyzer.expectToken(.operator_semicolon);
                break :blk for_content_expression;
            },
        };

        const for_node = try analyzer.addNode(.{
            .id = .for_loop,
            .token = token,
            .left = for_condition_node,
            .right = for_content_node,
        });

        return for_node;
    }

    fn breakExpression(analyzer: *Analyzer) !Node.Index {
        const t = try analyzer.expectToken(.fixed_keyword_break);
        const node_index = try analyzer.addNode(.{
            .id = .break_expression,
            .token = t,
            .left = Node.Index.null,
            .right = Node.Index.null,
        });
        return node_index;
    }

    fn assignExpression(analyzer: *Analyzer) !Node.Index {
        const left = try analyzer.expression();
        const expression_token = analyzer.token_i;
        const expression_id: Node.Id = switch (analyzer.peekToken()) {
            .operator_semicolon, .operator_comma, .operator_right_brace, .identifier => return left,
            .operator_assign => .assign,
            .operator_add_assign => .add_assign,
            .operator_sub_assign => .sub_assign,
            .operator_mul_assign => .mul_assign,
            .operator_div_assign => .div_assign,
            .operator_mod_assign => .mod_assign,
            else => |t| @panic(@tagName(t)),
        };
        analyzer.consumeToken();
        const right = try analyzer.expression();

        const node = Node{
            .id = expression_id,
            .token = expression_token,
            .left = left,
            .right = right,
        };

        // logln(.parser, .assign, "assign:\nleft: {}.\nright: {}", .{ node.left, node.right });
        return try analyzer.addNode(node);
    }

    fn parseAsmOperand(analyzer: *Analyzer) !Node.Index {
        const token = analyzer.token_i;
        const result = switch (analyzer.peekToken()) {
            .identifier => try analyzer.addNode(.{
                .id = .assembly_register,
                .token = blk: {
                    analyzer.consumeToken();
                    break :blk token;
                },
                .left = Node.Index.null,
                .right = Node.Index.null,
            }),
            .number_literal => blk: {
                analyzer.consumeToken();
                break :blk analyzer.addNode(.{
                    .id = .number_literal,
                    .token = token,
                    .left = Node.Index.null,
                    .right = Node.Index.null,
                });
            },
            .operator_left_brace => blk: {
                analyzer.consumeToken();
                const result = try analyzer.expression();
                _ = try analyzer.expectToken(.operator_right_brace);
                break :blk result;
            },
            else => |t| @panic(@tagName(t)),
        };
        return result;
    }

    fn compilerIntrinsic(analyzer: *Analyzer) !Node.Index {
        const intrinsic_token = try analyzer.expectToken(.intrinsic);
        _ = try analyzer.expectToken(.operator_left_parenthesis);
        const intrinsic_name = analyzer.bytes(intrinsic_token)[1..];

        const intrinsic_id = inline for (@typeInfo(Compilation.IntrinsicId).Enum.fields) |enum_field| {
            if (data_structures.byte_equal(enum_field.name, intrinsic_name)) {
                break @field(Compilation.IntrinsicId, enum_field.name);
            }
        } else @panic(intrinsic_name);

        var list = UnpinnedArray(Node.Index){};

        if (intrinsic_id == .@"asm") {
            const backtick = try analyzer.expectToken(.operator_backtick);
            var instruction_list = UnpinnedArray(Node.Index){};

            while (analyzer.peekToken() != .operator_backtick) {
                const instruction_token = analyzer.token_i;
                const instruction_name = try analyzer.identifierNode();

                var operand_list = UnpinnedArray(Node.Index){};
                while (analyzer.peekToken() != .operator_semicolon) {
                    const node = switch (analyzer.peekToken()) {
                        .identifier => try analyzer.addNode(.{
                            .id = .assembly_register,
                            .token = b: {
                                const t = analyzer.token_i;
                                analyzer.consumeToken();
                                break :b t;
                            },
                            .left = .null,
                            .right = .null,
                        }),
                        .number_literal => try analyzer.addNode(.{
                            .id = .number_literal,
                            .token = b: {
                                const t = analyzer.token_i;
                                analyzer.consumeToken();
                                break :b t;
                            },
                            .left = Node.Index.null,
                            .right = Node.Index.null,
                        }),
                        .operator_left_brace => b: {
                            const left_brace = try analyzer.expectToken(.operator_left_brace);
                            const code_expression = try analyzer.expression();
                            _ = try analyzer.expectToken(.operator_right_brace);

                            break :b try analyzer.addNode(.{
                                .id = .assembly_code_expression,
                                .token = left_brace,
                                .left = code_expression,
                                .right = .null,
                            });
                        },
                        else => |t| @panic(@tagName(t)),
                    };
                    switch (analyzer.peekToken()) {
                        .operator_comma => analyzer.consumeToken(),
                        .operator_semicolon => {},
                        else => |t| @panic(@tagName(t)),
                    }
                    try operand_list.append(analyzer.my_allocator, node);
                }

                analyzer.consumeToken();

                const instruction = try analyzer.addNode(.{
                    .id = .assembly_instruction,
                    .token = instruction_token,
                    .left = instruction_name,
                    .right = try analyzer.nodeList(operand_list),
                });

                try instruction_list.append(analyzer.my_allocator, instruction);
            }

            _ = try analyzer.expectToken(.operator_backtick);
            _ = try analyzer.expectToken(.operator_right_parenthesis);

            const assembly_block = try analyzer.addNode(.{
                .id = .assembly_code_block,
                .token = backtick,
                .left = try analyzer.nodeList(instruction_list),
                .right = .null,
            });
            try list.append(analyzer.my_allocator, assembly_block);

            const intrinsic = try analyzer.addNode(.{
                .id = .intrinsic,
                .token = intrinsic_token,
                .left = try analyzer.nodeList(list),
                .right = @enumFromInt(@intFromEnum(intrinsic_id)),
            });

            return intrinsic;
        } else {
            while (analyzer.peekToken() != .operator_right_parenthesis) {
                const parameter = try analyzer.expression();
                try list.append(analyzer.my_allocator, parameter);

                switch (analyzer.peekToken()) {
                    .operator_comma => analyzer.consumeToken(),
                    .operator_right_parenthesis => continue,
                    else => |t| @panic(@tagName(t)),
                }
            }

            // Consume the right parenthesis
            analyzer.consumeToken();
        }

        return try analyzer.addNode(.{
            .id = .intrinsic,
            .token = intrinsic_token,
            .left = try analyzer.nodeList(list),
            .right = @enumFromInt(@intFromEnum(intrinsic_id)),
        });
    }

    fn expression(analyzer: *Analyzer) anyerror!Node.Index {
        return try analyzer.expressionPrecedence(0);
    }

    const PrecedenceOperator = enum {
        compare_equal,
        compare_not_equal,
        compare_less,
        compare_greater,
        compare_less_equal,
        compare_greater_equal,
        add,
        sub,
        mul,
        div,
        mod,
        bit_and,
        bit_xor,
        bit_or,
        bool_and,
        bool_or,
        shift_left,
        shift_right,
        @"catch",
    };

    const operator_precedence = std.EnumArray(PrecedenceOperator, i32).init(.{
        .compare_equal = 30,
        .compare_not_equal = 30,
        .compare_less = 30,
        .compare_greater = 30,
        .compare_less_equal = 30,
        .compare_greater_equal = 30,
        .add = 60,
        .sub = 60,
        .mul = 70,
        .div = 70,
        .mod = 70,
        .bit_and = 40,
        .bit_xor = 40,
        .bit_or = 40,
        .bool_or = 10,
        .bool_and = 20,
        .shift_left = 50,
        .shift_right = 50,
        .@"catch" = 40,
    });

    const operator_associativity = std.EnumArray(PrecedenceOperator, Associativity).init(.{
        .compare_equal = .none,
        .compare_not_equal = .none,
        .compare_less = .none,
        .compare_greater = .none,
        .compare_less_equal = .none,
        .compare_greater_equal = .none,
        .add = .left,
        .sub = .left,
        .bit_and = .left,
        .bit_xor = .left,
        .bit_or = .left,
        .bool_and = .left,
        .bool_or = .left,
        .mul = .left,
        .div = .left,
        .mod = .left,
        .shift_left = .left,
        .shift_right = .left,
        .@"catch" = .left,
    });

    const operator_node_id = std.EnumArray(PrecedenceOperator, Node.Id).init(.{
        .compare_equal = .compare_equal,
        .compare_not_equal = .compare_not_equal,
        .compare_greater = .compare_greater,
        .compare_less = .compare_less,
        .compare_greater_equal = .compare_greater_equal,
        .compare_less_equal = .compare_less_equal,
        .add = .add,
        .sub = .sub,
        .bit_and = .bit_and,
        .bit_xor = .bit_xor,
        .bit_or = .bit_or,
        .bool_and = .bool_and,
        .bool_or = .bool_or,
        .mul = .mul,
        .div = .div,
        .mod = .mod,
        .shift_left = .shift_left,
        .shift_right = .shift_right,
        .@"catch" = .catch_expression,
    });

    fn expressionPrecedence(analyzer: *Analyzer, minimum_precedence: i32) !Node.Index {
        assert(minimum_precedence >= 0);
        var result = try analyzer.prefixExpression();
        // if (result != .null) {
        // const prefix_node = analyzer.nodes.get(result);
        // logln(.parser, .precedence, "Prefix: {s}", .{@tagName(prefix_node.id)});
        // }

        var banned_precedence: i32 = -1;

        while (analyzer.hasTokens()) {
            const token = analyzer.peekToken();
            // logln("Looping in expression precedence with token {}", .{token});
            const operator: PrecedenceOperator = switch (token) {
                .operator_semicolon,
                .operator_right_parenthesis,
                .operator_right_brace,
                .operator_right_bracket,
                .operator_comma,
                .operator_colon,
                .operator_assign,
                .operator_add_assign,
                .operator_sub_assign,
                .operator_mul_assign,
                .operator_div_assign,
                .operator_mod_assign,
                .operator_dot,
                .operator_switch_case,
                .fixed_keyword_const,
                .fixed_keyword_var,
                .fixed_keyword_return,
                .fixed_keyword_if,
                .fixed_keyword_else,
                .identifier,
                .discard,
                => break,
                .operator_compare_equal => .compare_equal,
                .operator_compare_not_equal => .compare_not_equal,
                .operator_compare_less => .compare_less,
                .operator_compare_greater => .compare_greater,
                .operator_compare_less_equal => .compare_less_equal,
                .operator_compare_greater_equal => .compare_greater_equal,
                .operator_add => .add,
                .operator_minus => .sub,
                .operator_asterisk => .mul,
                .operator_div => .div,
                .operator_mod => .mod,
                .operator_ampersand => .bit_and,
                .operator_bar => .bit_or,
                .operator_xor => .bit_xor,
                .fixed_keyword_and => .bool_and,
                .fixed_keyword_or => .bool_or,
                .operator_shift_left => .shift_left,
                .operator_shift_right => .shift_right,
                .fixed_keyword_catch => .@"catch",
                else => |t| @panic(@tagName(t)),
            };

            // logln(.parser, .precedence, "Precedence operator: {s}", .{@tagName(operator)});

            const precedence = operator_precedence.get(operator);
            if (precedence < minimum_precedence) {
                // logln(.parser, .precedence, "Breaking for minimum_precedence", .{});
                break;
            }

            if (precedence == banned_precedence) {
                unreachable;
            }

            const operator_token = analyzer.token_i;
            analyzer.consumeToken();

            const right = if (token == .fixed_keyword_catch and analyzer.peekToken() == .operator_bar) b: {
                const payload = try analyzer.parsePayload();
                const r_node = try analyzer.expressionPrecedence(precedence + 1);
                break :b try analyzer.addNode(.{
                    .id = .catch_payload,
                    .token = operator_token,
                    .left = payload,
                    .right = r_node,
                });
            } else try analyzer.expressionPrecedence(precedence + 1);

            const node_id = operator_node_id.get(operator);

            result = try analyzer.addNode(.{
                .id = node_id,
                .token = operator_token,
                .left = result,
                .right = right,
            });

            const associativity = operator_associativity.get(operator);

            if (associativity == .none) {
                banned_precedence = precedence;
            }
        }

        return result;
    }

    fn prefixExpression(analyzer: *Analyzer) !Node.Index {
        const token = analyzer.token_i;
        // logln("Prefix...", .{});
        const node_id: Node.Id = switch (analyzer.peekToken()) {
            else => |pref| {
                _ = pref;
                return try analyzer.primaryExpression();
            },
            .operator_bang => .boolean_not,
            .operator_minus => .negation,
            .fixed_keyword_try => .try_expression,
            // .tilde => |t| @panic(@tagName(t)),
        };

        return try analyzer.addNode(.{
            .id = node_id,
            .token = blk: {
                analyzer.consumeToken();
                break :blk token;
            },
            .left = try analyzer.prefixExpression(),
            .right = Node.Index.null,
        });
    }

    fn primaryExpression(analyzer: *Analyzer) !Node.Index {
        const token = analyzer.token_i;
        const result = switch (analyzer.peekToken()) {
            .identifier => switch (analyzer.peekTokenAhead(1)) {
                // TODO: tags
                // .operator_colon => unreachable,
                else => try analyzer.curlySuffixExpression(),
            },
            .string_literal,
            .character_literal,
            .number_literal,
            .intrinsic,
            .fixed_keyword_true,
            .fixed_keyword_false,
            .fixed_keyword_unreachable,
            .fixed_keyword_null,
            .fixed_keyword_switch,
            .operator_dot,
            .operator_left_parenthesis,
            .keyword_signed_integer,
            .keyword_unsigned_integer,
            .fixed_keyword_ssize,
            .fixed_keyword_usize,
            .fixed_keyword_enum,
            .fixed_keyword_struct,
            .discard,
            .fixed_keyword_undefined,
            .operator_left_bracket,
            .fixed_keyword_const,
            .fixed_keyword_var,
            .fixed_keyword_error,
            => try analyzer.curlySuffixExpression(),
            .fixed_keyword_fn => try analyzer.function(),
            .fixed_keyword_return => try analyzer.addNode(.{
                .id = .@"return",
                .token = blk: {
                    analyzer.consumeToken();
                    break :blk token;
                },
                .left = try analyzer.expression(),
                .right = Node.Index.null,
            }),
            .fixed_keyword_break => try analyzer.breakExpression(),
            // todo:?
            .operator_left_brace => try analyzer.block(),
            .fixed_keyword_if => try analyzer.ifExpression(),
            .fixed_keyword_bitfield => try analyzer.processContainerType(.fixed_keyword_bitfield),
            .operator_dollar => blk: {
                analyzer.consumeToken();
                const t = try analyzer.typeExpression();
                break :blk try analyzer.addNode(.{
                    .id = .comptime_expression,
                    .token = token,
                    .left = t,
                    .right = .null,
                });
            },
            else => |id| @panic(@tagName(id)),
        };

        return result;
    }

    fn curlySuffixExpression(analyzer: *Analyzer) !Node.Index {
        const left = try analyzer.typeExpression();

        return switch (analyzer.peekToken()) {
            .operator_left_brace => try analyzer.containerLiteral(left),
            else => left,
        };
    }

    fn noReturn(analyzer: *Analyzer) !Node.Index {
        const token_i = analyzer.token_i;
        assert(analyzer.peekToken() == .fixed_keyword_noreturn);
        analyzer.consumeToken();
        return try analyzer.addNode(.{
            .id = .keyword_noreturn,
            .token = token_i,
            .left = Node.Index.null,
            .right = Node.Index.null,
        });
    }

    fn boolLiteral(analyzer: *Analyzer) !Node.Index {
        return try analyzer.addNode(.{
            .id = switch (analyzer.peekToken()) {
                .fixed_keyword_true => .keyword_true,
                .fixed_keyword_false => .keyword_false,
                else => unreachable,
            },
            .token = blk: {
                const token_i = analyzer.token_i;
                analyzer.consumeToken();
                break :blk token_i;
            },
            .left = Node.Index.null,
            .right = Node.Index.null,
        });
    }

    const PointerOrArrayTypeExpectedExpression = enum {
        single_pointer_type,
        many_pointer_type,
        array_or_slice_type,
    };

    fn parseTermination(analyzer: *Analyzer) !Node.Index {
        _ = try analyzer.expectToken(.operator_colon);
        const token_i = analyzer.token_i;
        const token = analyzer.peekToken();
        const termination_id: Node.Id = switch (token) {
            .fixed_keyword_null => .null_terminated,
            .number_literal => switch (std.zig.parseNumberLiteral(analyzer.bytes(token_i))) {
                .int => |integer| switch (integer) {
                    0 => .zero_terminated,
                    else => @panic("Invalid number literal terminator"),
                },
                else => @panic("Invalid number literal terminator"),
            },
            else => |t| @panic(@tagName(t)),
        };

        const termination_node_index = try analyzer.addNode(.{
            .id = termination_id,
            .token = token_i,
            .left = Node.Index.null,
            .right = Node.Index.null,
        });
        analyzer.consumeToken();

        return termination_node_index;
    }

    fn pointerOrArrayTypeExpression(analyzer: *Analyzer, expected: PointerOrArrayTypeExpectedExpression) !Node.Index {
        const first = analyzer.token_i;

        var list = UnpinnedArray(Node.Index){};

        const expression_type: Node.Id = switch (expected) {
            .single_pointer_type => blk: {
                analyzer.consumeToken();

                break :blk .pointer_type;
            },
            .many_pointer_type => blk: {
                try list.append(analyzer.my_allocator, try analyzer.addNode(.{
                    .id = .many_pointer_expression,
                    .token = analyzer.token_i,
                    .left = Node.Index.null,
                    .right = Node.Index.null,
                }));
                _ = try analyzer.expectToken(.operator_left_bracket);
                _ = try analyzer.expectToken(.operator_ampersand);
                switch (analyzer.peekToken()) {
                    .operator_right_bracket => {},
                    .operator_colon => try list.append(analyzer.my_allocator, try analyzer.parseTermination()),
                    else => |t| @panic(@tagName(t)),
                }
                _ = try analyzer.expectToken(.operator_right_bracket);

                break :blk .pointer_type;
            },
            .array_or_slice_type => blk: {
                _ = try analyzer.expectToken(.operator_left_bracket);
                switch (analyzer.peekToken()) {
                    .operator_right_bracket => {
                        analyzer.consumeToken();
                        break :blk .slice_type;
                    },
                    .operator_colon => {
                        try list.append(analyzer.my_allocator, try analyzer.parseTermination());
                        _ = try analyzer.expectToken(.operator_right_bracket);
                        break :blk .slice_type;
                    },
                    else => {
                        const length_expression = try analyzer.expression();
                        try list.append(analyzer.my_allocator, length_expression);

                        switch (analyzer.peekToken()) {
                            .operator_right_bracket => {},
                            .operator_colon => try list.append(analyzer.my_allocator, try analyzer.parseTermination()),
                            else => |t| @panic(@tagName(t)),
                        }

                        _ = try analyzer.expectToken(.operator_right_bracket);

                        break :blk .array_type;
                    },
                }
            },
        };

        if (expression_type != .array_type) {
            const const_node = switch (analyzer.peekToken()) {
                .fixed_keyword_const => try analyzer.addNode(.{
                    .id = .const_expression,
                    .token = analyzer.token_i,
                    .left = Node.Index.null,
                    .right = Node.Index.null,
                }),
                else => Node.Index.null,
            };
            analyzer.consumeTokens(@intFromBool(analyzer.peekToken() == .fixed_keyword_const));

            if (const_node != .null) {
                try list.append(analyzer.my_allocator, const_node);
            }
        } else {
            assert(list.length > 0);
        }

        const type_expression = try analyzer.typeExpression();
        assert(type_expression != .null);
        try list.append(analyzer.my_allocator, type_expression);

        const node_list = try analyzer.nodeList(list);

        const node = Node{
            .id = expression_type,
            .token = first,
            .left = node_list,
            .right = Node.Index.null,
        };

        // logln(.parser, .pointer_like_type_expression, "ARRAY START\n===========", .{});
        // for (list.slice()) |ni| {
        // const n = analyzer.nodes.get(ni);
        // logln(.parser, .pointer_like_type_expression, "{s} node element: {s}", .{ @tagName(expression_type), @tagName(n.id) });
        // }
        // logln(.parser, .pointer_like_type_expression, "ARRAY END\n=========", .{});

        const node_index = try analyzer.addNode(node);
        // logln(.parser, .pointer_like_type_expression, "Pointer end", .{});

        switch (analyzer.peekToken()) {
            .operator_comma,
            .operator_right_parenthesis,
            .operator_left_brace,
            .operator_assign,
            .operator_semicolon,
            => return node_index,
            else => |t| @panic(@tagName(t)),
        }

        return node_index;
    }

    fn typeExpression(analyzer: *Analyzer) anyerror!Node.Index {
        const first = analyzer.token_i;
        return switch (analyzer.peekToken()) {
            else => try analyzer.errorUnionExpression(),
            .operator_optional => blk: {
                analyzer.consumeToken();
                break :blk try analyzer.addNode(.{
                    .id = .optional_type,
                    .token = first,
                    .left = try analyzer.typeExpression(),
                    .right = Node.Index.null,
                });
            },
            .operator_ampersand => try analyzer.pointerOrArrayTypeExpression(.single_pointer_type),
            .operator_left_bracket => switch (analyzer.peekTokenAhead(1)) {
                .operator_ampersand => try analyzer.pointerOrArrayTypeExpression(.many_pointer_type),
                .operator_asterisk => @panic("Meant to use ampersand?"),
                else => try analyzer.pointerOrArrayTypeExpression(.array_or_slice_type),
            },
        };
    }

    fn errorUnionExpression(analyzer: *Analyzer) !Node.Index {
        const initial = analyzer.token_i;
        if (analyzer.peekToken() == .operator_asterisk and analyzer.peekTokenAhead(1) == .operator_bang) {
            const asterisk = try analyzer.expectToken(.operator_asterisk);
            analyzer.consumeToken();
            const type_node = try analyzer.suffixExpression();

            const all_errors_node = try analyzer.addNode(.{
                .id = .all_errors,
                .token = asterisk,
                .left = .null,
                .right = .null,
            });

            const error_union = try analyzer.addNode(.{
                .id = .error_union,
                .token = asterisk,
                // All errors
                .left = all_errors_node,
                .right = type_node,
            });
            return error_union;
        } else {
            const suffix_expression = try analyzer.suffixExpression();

            return switch (analyzer.peekToken()) {
                .operator_bang => try analyzer.addNode(.{
                    .id = .error_union,
                    .token = blk: {
                        analyzer.consumeToken();
                        break :blk initial;
                    },
                    .left = suffix_expression,
                    .right = try analyzer.typeExpression(),
                }),
                else => suffix_expression,
            };
        }
    }

    fn suffixExpression(analyzer: *Analyzer) !Node.Index {
        analyzer.suffix_depth += 1;
        defer analyzer.suffix_depth -= 1;
        var result = try analyzer.primaryTypeExpression();

        while (true) {
            const suffix_operator = try analyzer.suffixOperator(result);
            if (suffix_operator != .null) {
                result = suffix_operator;
            } else {
                if (analyzer.peekToken() == .operator_left_parenthesis) {
                    const left_parenthesis = analyzer.token_i;
                    analyzer.consumeToken();

                    var expression_list = UnpinnedArray(Node.Index){};
                    // logln(.parser, .suffix, "[DEPTH={}] Initializating suffix call-like expression", .{analyzer.suffix_depth});
                    while (analyzer.peekToken() != .operator_right_parenthesis) {
                        const current_token = analyzer.token_i;
                        // logln(.parser, .suffix, "[DEPTH={}] First token: {s}", .{ analyzer.suffix_depth, @tagName(analyzer.tokens[current_token].id) });
                        var parameter = try analyzer.expression();
                        // const parameter_node = analyzer.nodes.items[parameter.unwrap()];
                        // logln(.parser, .suffix, "[DEPTH={}] Parameter node: {s}", .{ analyzer.suffix_depth, @tagName(parameter_node.id) });
                        if (analyzer.peekToken() == .operator_assign) {
                            analyzer.consumeToken();

                            parameter = try analyzer.addNode(.{
                                .id = .named_argument,
                                .token = current_token,
                                .left = parameter,
                                .right = try analyzer.expression(),
                            });
                        }

                        try expression_list.append(analyzer.my_allocator, parameter);

                        switch (analyzer.peekToken()) {
                            .operator_right_parenthesis => {},
                            .operator_comma => analyzer.consumeToken(),
                            .operator_colon, .operator_right_brace, .operator_right_bracket => unreachable,
                            .operator_dot => @panic("Unexpected period"), //panic("[DEPTH={}] Unexpected period", .{analyzer.suffix_depth}),
                            else => |t| @panic(@tagName(t)),
                        }
                    }

                    // logln(.parser, .suffix, "[DEPTH={}] Ending suffix call-like expression", .{analyzer.suffix_depth});
                    // logln(.parser, .suffix, "Callee node: {s}", .{@tagName(analyzer.nodes.get(result).id)});

                    _ = try analyzer.expectToken(.operator_right_parenthesis);
                    // const is_comma = analyzer.tokens[analyzer.token_i].id == .comma;
                    result = try analyzer.addNode(.{
                        .id = .call,
                        .token = left_parenthesis,
                        .left = result,
                        .right = try analyzer.nodeList(expression_list),
                    });
                } else {
                    return result;
                }
            }
        }

        unreachable;
    }

    fn containerLiteral(analyzer: *Analyzer, type_node: Node.Index) anyerror!Node.Index {
        const token = try analyzer.expectToken(.operator_left_brace);

        var list = UnpinnedArray(Node.Index){};

        const InitializationType = enum {
            anonymous,
            array_indices,
            container_field_names,
            empty_literal,
            empty_container_literal_guess,
            empty_array_literal,
        };

        var current_initialization: ?InitializationType = null;

        while (analyzer.peekToken() != .operator_right_brace) {
            const start_token = analyzer.token_i;
            const iteration_initialization_type: InitializationType = switch (analyzer.peekToken()) {
                .operator_dot => switch (analyzer.peekTokenAhead(1)) {
                    .identifier => switch (analyzer.peekTokenAhead(2)) {
                        .operator_assign => blk: {
                            analyzer.consumeTokens(3);
                            const field_expression_initializer = try analyzer.expression();

                            const field_initialization = try analyzer.addNode(.{
                                .id = .container_field_initialization,
                                .token = start_token,
                                .left = field_expression_initializer,
                                .right = Node.Index.null,
                            });

                            try list.append(analyzer.my_allocator, field_initialization);
                            switch (analyzer.peekToken()) {
                                .operator_comma => analyzer.consumeToken(),
                                else => {},
                            }

                            break :blk .container_field_names;
                        },
                        else => |t| @panic(@tagName(t)),
                    },
                    else => blk: {
                        try list.append(analyzer.my_allocator, try analyzer.anonymousExpression());
                        _ = try analyzer.expectToken(.operator_comma);
                        break :blk .anonymous;
                    },
                },
                .string_literal,
                .identifier,
                .number_literal,
                .intrinsic,
                .fixed_keyword_if,
                => blk: {
                    const field_expression_initializer = try analyzer.expression();
                    switch (analyzer.peekToken()) {
                        .operator_comma => analyzer.consumeToken(),
                        else => {},
                    }

                    try list.append(analyzer.my_allocator, field_expression_initializer);
                    break :blk .anonymous;
                },
                else => |t| @panic(@tagName(t)),
            };

            if (current_initialization) |ci| {
                if (ci != iteration_initialization_type) {
                    unreachable;
                }
            }

            current_initialization = iteration_initialization_type;
        }

        _ = try analyzer.expectToken(.operator_right_brace);

        const initialization: InitializationType = current_initialization orelse switch (type_node) {
            .null => .empty_literal,
            else => switch (analyzer.nodes.get(type_node).id) {
                .identifier, .call => .empty_container_literal_guess,
                .array_type => .empty_array_literal,
                else => |t| @panic(@tagName(t)),
            },
        };

        return try analyzer.addNode(.{
            .id = switch (type_node) {
                .null => switch (initialization) {
                    .container_field_names => .anonymous_container_literal,
                    .empty_literal => .anonymous_empty_literal,
                    .anonymous => .anonymous_array_literal,
                    else => |t| @panic(@tagName(t)),
                },
                else => switch (initialization) {
                    .container_field_names => .container_literal,
                    .empty_container_literal_guess => .empty_container_literal_guess,
                    .anonymous => .array_literal,
                    .empty_array_literal => .array_literal,
                    else => |t| @panic(@tagName(t)),
                },
            },
            .token = token,
            .left = type_node,
            .right = try analyzer.nodeList(list),
        });
    }

    fn discardNode(analyzer: *Analyzer) !Node.Index {
        const token = analyzer.token_i;
        assert(analyzer.peekToken() == .discard);
        analyzer.consumeToken();
        return try analyzer.addNode(.{
            .id = .discard,
            .token = token,
            .left = Node.Index.null,
            .right = Node.Index.null,
        });
    }

    fn processContainerType(analyzer: *Analyzer, maybe_token_id: ?Token.Id) !Node.Index {
        const token_i = if (maybe_token_id) |tid| try analyzer.expectToken(tid) else analyzer.token_i;
        assert(Token.unwrap(analyzer.token_i) < analyzer.token_buffer.length);
        const token_id = maybe_token_id orelse .fixed_keyword_struct;
        const container_type: Compilation.ContainerType = switch (token_id) {
            .fixed_keyword_struct => .@"struct",
            .fixed_keyword_enum => .@"enum",
            .fixed_keyword_bitfield => .bitfield,
            else => unreachable,
        };

        const node_id: Node.Id = switch (token_id) {
            .fixed_keyword_struct => .struct_type,
            .fixed_keyword_enum => .enum_type,
            .fixed_keyword_bitfield => .bitfield_type,
            else => unreachable,
        };

        const parameters_node = if (analyzer.hasTokens() and analyzer.peekToken() == .operator_left_parenthesis) b: {
            analyzer.consumeToken();
            var list = UnpinnedArray(Node.Index){};
            while (analyzer.peekToken() != .operator_right_parenthesis) {
                const parameter_node = try analyzer.expression();
                try list.append(analyzer.my_allocator, parameter_node);
                switch (analyzer.peekToken()) {
                    .operator_comma => analyzer.consumeToken(),
                    else => {},
                }
            }

            analyzer.consumeToken();

            break :b try analyzer.nodeList(list);
        } else Node.Index.null;

        if (maybe_token_id) |_| _ = try analyzer.expectToken(.operator_left_brace);
        var node_list = UnpinnedArray(Node.Index){};

        while (analyzer.hasTokens() and analyzer.peekToken() != .operator_right_brace) {
            const first = analyzer.token_i;
            // logln(.parser, .container_members, "First token for container member: {s}", .{@tagName(analyzer.peekToken())});

            const member_node_index: Node.Index = switch (analyzer.peekToken()) {
                .fixed_keyword_comptime => switch (analyzer.peekTokenAhead(1)) {
                    .operator_left_brace => b: {
                        analyzer.consumeToken();
                        const comptime_block = try analyzer.block();

                        break :b try analyzer.addNode(.{
                            .id = .@"comptime",
                            .token = first,
                            .left = comptime_block,
                            .right = Node.Index.null,
                        });
                    },
                    else => |t| @panic(@tagName(t)),
                },
                .identifier => b: {
                    analyzer.consumeToken();

                    switch (container_type) {
                        .@"struct",
                        .bitfield,
                        => {
                            _ = try analyzer.expectToken(.operator_colon);

                            const field_type = try analyzer.typeExpression();

                            const field_default_node = if (analyzer.peekToken() == .operator_assign) f: {
                                analyzer.consumeToken();
                                const default_index = try analyzer.expression();
                                const default_node = analyzer.nodes.get(default_index);
                                assert(default_node.id != .node_list);
                                break :f default_index;
                            } else Node.Index.null;

                            _ = try analyzer.expectToken(.operator_comma);

                            const field_node = try analyzer.addNode(.{
                                .id = .container_field,
                                .token = first,
                                .left = field_type,
                                .right = field_default_node,
                            });

                            break :b field_node;
                        },
                        .@"enum" => {
                            const value_associated = switch (analyzer.peekToken()) {
                                .operator_comma => Node.Index.null,
                                else => value: {
                                    analyzer.consumeToken();
                                    break :value try analyzer.expression();
                                },
                            };

                            _ = try analyzer.expectToken(.operator_comma);

                            const enum_field_node = try analyzer.addNode(.{
                                .id = .enum_field,
                                .token = first,
                                .left = value_associated,
                                .right = Node.Index.null,
                            });

                            break :b enum_field_node;
                        },
                    }
                },
                .fixed_keyword_const, .fixed_keyword_var => try analyzer.symbolDeclaration(),
                .fixed_keyword_test => try analyzer.testDeclaration(),
                else => |t| @panic(@tagName(t)),
            };

            const member_node = analyzer.nodes.get(member_node_index);
            // logln(.parser, .container_members, "Container member {s}", .{@tagName(member_node.id)});
            assert(member_node.id != .identifier);

            try node_list.append(analyzer.my_allocator, member_node_index);
        }

        if (maybe_token_id) |_| _ = try analyzer.expectToken(.operator_right_brace);

        // for (node_list.slice(), 0..) |member_node_index, index| {
        //     _ = index; // autofix
        //     const member_node = analyzer.nodes.get(member_node_index);
        //     if (member_node.id == .identifier) {
        //         const token_offset = analyzer.getTokenOffset(member_node.token);
        //         _ = token_offset; // autofix
        //         // std.debug.print("Node index #{} (list index {}):\n```\n{s}\n```\n", .{ Node.unwrap(member_node_index), index, analyzer.source_file[token_offset..] });
        //         // std.debug.print("ID: {s}\n", .{analyzer.bytes(member_node.token)});
        //         unreachable;
        //     }
        // }

        return try analyzer.addNode(.{
            .id = node_id,
            .token = token_i,
            .left = try analyzer.nodeList(node_list),
            .right = parameters_node,
        });
    }

    fn testDeclaration(analyzer: *Analyzer) !Node.Index {
        const test_token = try analyzer.expectToken(.fixed_keyword_test);
        const name_node: Node.Index = if (analyzer.peekToken() == .string_literal) try analyzer.addNode(.{
            .id = .string_literal,
            .token = b: {
                const index = analyzer.token_i;
                analyzer.consumeToken();
                break :b index;
            },
            .left = .null,
            .right = .null,
        }) else .null;
        const test_block = try analyzer.block();
        return try analyzer.addNode(.{
            .token = test_token,
            .id = .test_declaration,
            .left = test_block,
            .right = name_node,
        });
    }

    fn primaryTypeExpression(analyzer: *Analyzer) anyerror!Node.Index {
        const token_i = analyzer.token_i;
        const token = analyzer.peekToken();

        return try switch (token) {
            .fixed_keyword_fn => blk: {
                analyzer.consumeToken();
                break :blk analyzer.functionPrototype();
            },
            .string_literal => blk: {
                analyzer.consumeToken();
                break :blk analyzer.addNode(.{
                    .id = .string_literal,
                    .token = token_i,
                    .left = Node.Index.null,
                    .right = Node.Index.null,
                });
            },
            .character_literal => blk: {
                analyzer.consumeToken();
                break :blk analyzer.addNode(.{
                    .id = .character_literal,
                    .token = token_i,
                    .left = Node.Index.null,
                    .right = Node.Index.null,
                });
            },
            .number_literal => blk: {
                analyzer.consumeToken();
                break :blk analyzer.addNode(.{
                    .id = .number_literal,
                    .token = token_i,
                    .left = Node.Index.null,
                    .right = Node.Index.null,
                });
            },
            .identifier => analyzer.identifierNode(),
            .discard => try analyzer.discardNode(),
            .fixed_keyword_noreturn => analyzer.noReturn(),
            .fixed_keyword_true, .fixed_keyword_false => analyzer.boolLiteral(),
            .fixed_keyword_undefined => analyzer.addNode(.{
                .id = .undefined,
                .token = blk: {
                    analyzer.consumeToken();
                    break :blk token_i;
                },
                .left = Node.Index.null,
                .right = Node.Index.null,
            }),
            .fixed_keyword_null => analyzer.addNode(.{
                .id = .null_literal,
                .token = blk: {
                    analyzer.consumeToken();
                    break :blk token_i;
                },
                .left = Node.Index.null,
                .right = Node.Index.null,
            }),
            .fixed_keyword_unreachable => analyzer.addNode(.{
                .id = .@"unreachable",
                .token = blk: {
                    analyzer.consumeToken();
                    break :blk token_i;
                },
                .left = Node.Index.null,
                .right = Node.Index.null,
            }),
            .intrinsic => analyzer.compilerIntrinsic(),
            .fixed_keyword_bool => analyzer.addNode(.{
                .id = .bool_type,
                .token = blk: {
                    analyzer.consumeToken();
                    break :blk token_i;
                },
                .left = Node.Index.null,
                .right = Node.Index.null,
            }),
            .keyword_unsigned_integer, .keyword_signed_integer => |signedness| analyzer.addNode(.{
                .id = switch (signedness) {
                    .keyword_unsigned_integer => .unsigned_integer_type,
                    .keyword_signed_integer => .signed_integer_type,
                    else => unreachable,
                },
                .token = blk: {
                    analyzer.consumeToken();
                    break :blk token_i;
                },
                .left = @enumFromInt(@as(u32, try std.fmt.parseInt(u16, b: {
                    const slice = analyzer.bytes(token_i)[1..];
                    if (slice.len == 0) unreachable;
                    break :b slice;
                }, 10))),
                .right = Node.Index.null,
            }),
            .fixed_keyword_usize, .fixed_keyword_ssize => |size_type| analyzer.addNode(.{
                .id = switch (size_type) {
                    .fixed_keyword_usize => .usize_type,
                    .fixed_keyword_ssize => .ssize_type,
                    else => unreachable,
                },
                .token = blk: {
                    analyzer.consumeToken();
                    break :blk token_i;
                },
                .left = Node.Index.null,
                .right = Node.Index.null,
            }),
            .fixed_keyword_void => analyzer.addNode(.{
                .id = .void_type,
                .token = blk: {
                    analyzer.consumeToken();
                    break :blk token_i;
                },
                .left = Node.Index.null,
                .right = Node.Index.null,
            }),
            .fixed_keyword_switch => try analyzer.switchExpression(),
            .operator_dot => try analyzer.anonymousExpression(),
            .fixed_keyword_enum, .fixed_keyword_struct => try analyzer.processContainerType(token),
            .operator_left_parenthesis => blk: {
                analyzer.consumeToken();
                const expr = try analyzer.expression();
                _ = try analyzer.expectToken(.operator_right_parenthesis);
                break :blk expr;
            },
            .fixed_keyword_error => blk: {
                analyzer.consumeToken();
                const backing_type: Node.Index = if (analyzer.peekToken() == .operator_left_parenthesis) b: {
                    analyzer.consumeToken();
                    const type_node = try analyzer.typeExpression();
                    _ = try analyzer.expectToken(.operator_right_parenthesis);
                    break :b type_node;
                } else Node.Index.null;

                _ = try analyzer.expectToken(.operator_left_brace);
                var list = UnpinnedArray(Node.Index){};

                while (analyzer.peekToken() != .operator_right_brace) {
                    const tok_i = analyzer.token_i;
                    const t_id = analyzer.peekToken();
                    const identifier = switch (t_id) {
                        .identifier => try analyzer.identifierNode(),
                        else => |t| @panic(@tagName(t)),
                    };

                    const value_associated = switch (analyzer.peekToken()) {
                        .operator_comma => Node.Index.null,
                        else => value: {
                            analyzer.consumeToken();
                            break :value try analyzer.expression();
                        },
                    };
                    _ = try analyzer.expectToken(.operator_comma);

                    const error_field_node = try analyzer.addNode(.{
                        .id = .error_field,
                        .token = tok_i,
                        .left = identifier,
                        .right = value_associated,
                    });

                    try list.append(analyzer.my_allocator, error_field_node);
                }

                analyzer.consumeToken();

                break :blk try analyzer.addNode(.{
                    .id = .error_type,
                    .token = token_i,
                    .left = try analyzer.nodeList(list),
                    .right = backing_type,
                });
            },
            else => |t| switch (t) {
                .identifier => @panic(analyzer.bytes(token_i)),
                else => @panic(@tagName(t)),
            },
        };
    }

    fn anonymousExpression(analyzer: *Analyzer) !Node.Index {
        const token_i = analyzer.token_i;
        _ = try analyzer.expectToken(.operator_dot);
        return switch (analyzer.peekToken()) {
            .identifier => try analyzer.addNode(.{
                .id = .dot_literal,
                .token = blk: {
                    analyzer.consumeToken();
                    break :blk token_i;
                },
                .left = Node.Index.null,
                .right = Node.Index.null,
            }),
            .operator_left_brace => try analyzer.containerLiteral(Node.Index.null),
            else => |t| @panic(@tagName(t)),
        };
    }

    // TODO:
    fn suffixOperator(analyzer: *Analyzer, left: Node.Index) !Node.Index {
        const token = analyzer.token_i;
        const result: Node.Index = switch (analyzer.peekToken()) {
            .operator_left_bracket => blk: {
                analyzer.consumeToken();
                const index_expression = try analyzer.expression();

                if (analyzer.peekToken() == .operator_dot and analyzer.peekTokenAhead(1) == .operator_dot) {
                    analyzer.consumeTokens(2);
                    const range_end_expression = switch (analyzer.peekToken()) {
                        .operator_right_bracket => Node.Index.null,
                        else => try analyzer.expression(),
                    };

                    _ = try analyzer.expectToken(.operator_right_bracket);

                    break :blk try analyzer.addNode(.{
                        .id = .slice,
                        .token = token,
                        .left = left,
                        .right = try analyzer.addNode(.{
                            .id = .range,
                            .token = token,
                            .left = index_expression,
                            .right = range_end_expression,
                        }),
                    });
                } else {
                    _ = try analyzer.expectToken(.operator_right_bracket);
                    break :blk try analyzer.addNode(.{
                        .id = .indexed_access,
                        .token = token,
                        .left = left,
                        .right = index_expression,
                    });
                }
            },
            .operator_dot => switch (analyzer.peekTokenAhead(1)) {
                .identifier => try analyzer.addNode(.{
                    .id = .field_access,
                    .token = blk: {
                        analyzer.consumeToken();
                        break :blk token;
                    },
                    .left = left,
                    .right = try analyzer.addNode(.{
                        .id = .identifier,
                        .token = blk: {
                            const t = analyzer.token_i;
                            analyzer.consumeToken();
                            break :blk t;
                        },
                        .left = Node.Index.null,
                        .right = Node.Index.null,
                    }),
                }),
                .operator_dot => Node.Index.null,
                .operator_ampersand => try analyzer.addNode(.{
                    .id = .address_of,
                    .token = blk: {
                        analyzer.consumeTokens(2);
                        break :blk token;
                    },
                    .left = left,
                    .right = Node.Index.null,
                }),
                .operator_at => try analyzer.addNode(.{
                    .id = .pointer_dereference,
                    .token = blk: {
                        analyzer.consumeTokens(2);
                        break :blk token;
                    },
                    .left = left,
                    .right = Node.Index.null,
                }),
                .operator_optional => try analyzer.addNode(.{
                    .id = .optional_unwrap,
                    .token = blk: {
                        analyzer.consumeToken();
                        break :blk token;
                    },
                    .left = left,
                    .right = blk: {
                        const t = analyzer.token_i;
                        analyzer.consumeToken();
                        break :blk Node.wrap(Token.unwrap(t));
                    },
                }),
                else => |t| @panic(@tagName(t)),
            },
            else => Node.Index.null,
        };

        return result;
    }

    fn addNode(analyzer: *Analyzer, node: Node) !Node.Index {
        const node_index = try analyzer.nodes.append(analyzer.my_allocator, node);
        // logln(.parser, .node_creation, "Adding node #{} {s} to file #{} (left: {}, right: {})", .{ Node.unwrap(node_index), @tagName(node.id), File.unwrap(analyzer.file_index), switch (node.left) {
        //     .null => 0xffff_ffff,
        //     else => Node.unwrap(node.left),
        // }, switch (node.right) {
        //     .null => 0xffff_ffff,
        //     else => Node.unwrap(node.right),
        // }});
        // if (Logger.bitset.contains(.node_creation_detailed)) {
        //     const chunk_start = analyzer.lexer.offsets.items[node.token];
        //     const chunk_end = analyzer.lexer.offsets.items[node.token + 1];
        //     const chunk_from_start = analyzer.source_file[chunk_start..];
        //     const end = @min(200, chunk_end - chunk_start);
        //     const chunk = chunk_from_start[0..end];
        //     logln(.parser, .node_creation, "[SOURCE]: ```\n{s}\n```\n", .{chunk});
        // }

        // if (node.id == .identifier) {
        //     logln("Node identifier: {s}", .{analyzer.bytes(node.token)});
        // }
        return node_index;
    }

    fn nodeList(analyzer: *Analyzer, node_list: UnpinnedArray(Node.Index)) !Node.Index {
        const index = analyzer.node_lists.length;
        try analyzer.node_lists.append(analyzer.my_allocator, node_list);
        return try analyzer.addNode(.{
            .id = .node_list,
            .token = Token.wrap(0),
            .left = @enumFromInt(index),
            .right = Node.Index.null,
        });
    }

    fn identifierNode(analyzer: *Analyzer) !Node.Index {
        const identifier_token = analyzer.token_i;
        const t = analyzer.peekToken();
        assert(t == .identifier);
        analyzer.consumeToken();
        return try analyzer.addNode(.{
            .id = .identifier,
            .token = identifier_token,
            .left = Node.Index.null,
            .right = Node.Index.null,
        });
    }
};

// Here it is assumed that left brace is consumed
pub fn analyze(allocator: Allocator, my_allocator: *data_structures.MyAllocator, lexer_result: lexer.Result, source_file: []const u8, token_buffer: *Token.Buffer, node_list: *Node.List, node_lists: *UnpinnedArray(UnpinnedArray(Node.Index))) !Result {
    const start = std.time.Instant.now() catch unreachable;
    var analyzer = Analyzer{
        .lexer = lexer_result,
        .token_buffer = token_buffer,
        .source_file = source_file,
        // .file_index = file_index,
        .token_i = lexer_result.offset,
        .allocator = allocator,
        .my_allocator = my_allocator,
        .nodes = node_list,
        .node_lists = node_lists,
    };
    const main_node_index = try analyzer.processContainerType(null);

    const end = std.time.Instant.now() catch unreachable;

    return .{
        .main_node_index = main_node_index,
        .time = end.since(start),
    };
}

pub const SymbolDeclaration = struct {
    type_node: Node.Index,
    initialization_node: Node.Index,
    mutability_token: Token.Index,
};

const Associativity = enum {
    none,
    left,
};