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// This file is part of the 64k demo project.
// It tests the ShaderComposer utility.

#include "gpu/effects/shader_composer.h"
#include <cassert>
#include <iostream>
#include <string>

void test_composition() {
    std::cout << "Testing Shader Composition..." << std::endl;
    auto& sc = ShaderComposer::Get();
    
    sc.RegisterSnippet("math", "fn add(a: f32, b: f32) -> f32 { return a + b; }");
    sc.RegisterSnippet("util", "fn square(a: f32) -> f32 { return a * a; }");
    
    std::string main_code = "fn main() { let x = add(1.0, square(2.0)); }";
    std::string result = sc.Compose({"math", "util"}, main_code);
    
    // Verify order and presence
    assert(result.find("Snippet: math") != std::string::npos);
    assert(result.find("Snippet: util") != std::string::npos);
    assert(result.find("Main Code") != std::string::npos);
    
    size_t pos_math = result.find("Snippet: math");
    size_t pos_util = result.find("Snippet: util");
    size_t pos_main = result.find("Main Code");
    
    assert(pos_math < pos_util);
    assert(pos_util < pos_main);
    
    std::cout << "Composition logic verified." << std::endl;
}

int main() {
    test_composition();
    std::cout << "--- ALL SHADER COMPOSER TESTS PASSED ---" << std::endl;
    return 0;
}