003 stdlib runtime import

// Test 995: User programs cannot import stdlib modules at runtime yet
//
// BUG: User programs SHOULD be able to import stdlib modules like $std/parser
//      and use them at runtime, but can't because ~build.requires isn't implemented
//
// CURRENT: Backend compiles output_emitted.zig with bare `zig build-exe`
//          This doesn't set up module imports, so @import("parser") fails
//
// EXPECTED: Once ~build.requires is implemented:
//   1. User declares: ~build.requires { ... set up parser module ... }
//   2. Backend generates build.zig with module configuration
//   3. Final compilation has modules available
//   4. User code can actually call parser.source_event.handler()
//
// Related: docs/BUILD_REQUIRES.md

~import "$std/parser"

const std = @import("std");

~event test_parser_runtime {}
| success {}

~proc test_parser_runtime {
    const allocator = std.heap.page_allocator;

    // This code is CORRECT but won't work until ~build.requires is implemented
    const test_source =
        \\~event hello {}
        \\| done {}
    ;

    // Call parser at USER RUNTIME (not comptime)
    const result = parser.source_event.handler(.{
        .source = test_source,
        .file_name = "test.kz",
        .allocator = allocator,
    });

    switch (result) {
        .parsed => |p| {
            std.debug.print("SUCCESS! Parsed {} items at runtime\n", .{p.ast.ast.items.len});
        },
        .parse_error => |e| {
            std.debug.print("Parse error: {s}\n", .{e.message});
        },
    }

    return .{ .success = .{} };
}

~test_parser_runtime()
| success |> _