005 glob with variants

// Test: Glob patterns combined with |variant syntax
//
// Variants are NOT just for different targets (GPU/CPU/WASM).
// They're for ANY alternative implementation:
//
//   ~proc sort|zig(reference)   - obviously correct, slow
//   ~proc sort|zig(optimized)   - fast, complex, needs verification
//
// This enables PROPERTY TESTING:
//   For random inputs, reference == optimized
//
// Syntax forms:
//   ~proc event|target              - target variant (gpu, js, wasm)
//   ~proc event|target(qualifier)   - qualified variant (zig(reference))
//   ~proc event.*|variant           - glob + variant combined

// === USE CASE 1: Property Testing ===

~pub event sort { items: []i32 }
| sorted []i32

// Reference implementation - simple, obviously correct
~proc sort|zig(reference) {
    // Bubble sort - O(n²) but trivially correct
    var result = items;
    for (0..result.len) |i| {
        for (i + 1..result.len) |j| {
            if (result[j] < result[i]) {
                const tmp = result[i];
                result[i] = result[j];
                result[j] = tmp;
            }
        }
    }
    return .{ .sorted = result };
}

// Optimized implementation - complex, needs testing
~proc sort|zig(optimized) {
    // Introsort with median-of-three pivot - fast but subtle
    return .{ .sorted = std.sort.sort(items) };
}

// Property test: both variants produce same output
// ~test(sort variants equivalent) {
//     const input = random_array(1000);
//     ~sort|zig(reference) = (items: input)
//     | sorted ref |>
//         sort|zig(optimized)(items: input)
//         | sorted opt |> assert.eq(ref.items, opt.items)
// }


// === USE CASE 2: Target-Specific Implementations ===

~[transform]pub event image.transform.* {
    event_name: []const u8,
    pixels: []u8,
    width: u32,
    height: u32,
}
| transformed []u8

~proc image.transform.*|cpu {
    return .{ .transformed = pixels };
}

~proc image.transform.*|gpu {
    // GLSL compute shader dispatch
    return .{ .transformed = pixels };
}

~proc image.transform.*|wasm {
    // WebAssembly-friendly, no SIMD
    return .{ .transformed = pixels };
}


// === USE CASE 3: Glob + Variant + Property Test ===

// ALL image transforms can be property-tested:
// ~test(image.transform.* cpu == gpu) {
//     ~image.transform.blur|cpu = (pixels: test_image, ...)
//     | transformed cpu_result |>
//         image.transform.blur|gpu(pixels: test_image, ...)
//         | transformed gpu_result |>
//             assert.pixels_close(cpu_result.pixels, gpu_result.pixels, epsilon: 0.001)
// }