// Step 72 TDD Test: End-to-end pipeline
//
// Tests the full Whetstone pipeline:
// 1. Python source → parse → infer → validate → optimize → generate Python
// 2. Python source → parse → project to C++ → generate C++
// 3. C++ source → parse → infer → generate C++
// 4. Parse with constant expressions → verify folding occurs
// 5. Pipeline with diagnostics (parser errors flow through)
// 6. Round-trip: Python source → AST → Python output preserves semantics

#include <iostream>
#include <string>
#include <cassert>
#include "Pipeline.h"

int main() {
    int passed = 0;
    int failed = 0;
    Pipeline pipeline;

    // --- Test 1: Python source → full pipeline → Python output ---
    {
        std::string source = R"(
def greet(name):
    return name
)";
        auto result = pipeline.run(source, "python", "python");
        assert(result.success && "Pipeline should succeed");
        assert(result.ast != nullptr && "AST should be produced");
        assert(!result.generatedCode.empty() && "Generated code should not be empty");
        assert(result.generatedCode.find("def ") != std::string::npos &&
               "Python output should contain 'def'");

        // Should have inferred @Reclaim(Tracing) for Python
        bool foundTracing = false;
        for (const auto& s : result.suggestions) {
            if (s.strategy == "Tracing") foundTracing = true;
        }
        assert(foundTracing && "Should infer @Reclaim(Tracing) for Python");

        std::cout << "Test 1 PASS: Python → full pipeline → Python output" << std::endl;
        ++passed;
    }

    // --- Test 2: Python → project to C++ → generate C++ ---
    {
        std::string source = R"(
def add(a, b):
    return a
)";
        auto result = pipeline.run(source, "python", "cpp");
        assert(result.success && "Pipeline should succeed");
        assert(!result.generatedCode.empty() && "C++ code should be generated");

        std::cout << "Test 2 PASS: Python → project to C++ → C++ output" << std::endl;
        ++passed;
    }

    // --- Test 3: C++ source → parse → infer → generate C++ ---
    {
        std::string source = R"(
int compute() {
    return 42;
}
)";
        auto result = pipeline.run(source, "cpp", "cpp");
        assert(result.success && "Pipeline should succeed for C++ source");
        assert(result.ast != nullptr && "AST should be produced from C++");

        // Should infer RAII for C++
        bool foundRAII = false;
        for (const auto& s : result.suggestions) {
            if (s.strategy == "RAII") foundRAII = true;
        }
        assert(foundRAII && "Should infer @Lifetime(RAII) for C++");

        std::cout << "Test 3 PASS: C++ → parse → infer → generate C++" << std::endl;
        ++passed;
    }

    // --- Test 4: Constant folding in pipeline ---
    {
        // Build an AST manually with a foldable expression
        Module mod("m1", "Test", "python");
        Function* fn = new Function("f1", "calc");
        Return* ret = new Return();
        ret->id = "r1";
        BinaryOperation* binOp = new BinaryOperation("b1", "+");
        IntegerLiteral* left = new IntegerLiteral("i1", 10);
        IntegerLiteral* right = new IntegerLiteral("i2", 20);
        binOp->setChild("left", left);
        binOp->setChild("right", right);
        ret->setChild("value", binOp);
        fn->addChild("body", ret);
        mod.addChild("functions", fn);

        // Run transform engine
        TransformEngine engine;
        engine.setRoot(&mod);
        auto foldResult = engine.constantFolding();

        assert(foldResult.applied && "Constant folding should apply");

        // Generate and verify the folded value appears
        PythonGenerator gen;
        std::string output = gen.generate(&mod);
        assert(output.find("30") != std::string::npos &&
               "Folded constant 10+20=30 should appear in output");

        std::cout << "Test 4 PASS: Constant folding produces correct generated output" << std::endl;
        ++passed;

        delete right;
        delete left;
        delete binOp;
        delete ret;
        delete fn;
    }

    // --- Test 5: Pipeline results include parse diagnostics ---
    {
        // Even valid Python should produce a result with empty diagnostics
        std::string source = "def f():\n    return 1\n";
        auto result = pipeline.run(source, "python", "python");
        assert(result.success && "Pipeline should succeed");
        // Parse diagnostics available (may be empty for valid source)
        // Just verify the pipeline carried them through
        assert(result.ast != nullptr && "Valid source should produce AST");

        std::cout << "Test 5 PASS: Parse diagnostics flow through pipeline" << std::endl;
        ++passed;
    }

    // --- Test 6: Pipeline with annotation validation ---
    {
        // Create AST with @Deallocate(Explicit) but no deallocation
        Module mod("m1", "Test", "cpp");
        Function* fn = new Function("f1", "leak");
        DeallocateAnnotation* anno = new DeallocateAnnotation();
        anno->id = "a1";
        anno->strategy = "Explicit";
        fn->addChild("annotations", anno);
        Variable* var = new Variable("v1", "ptr");
        fn->addChild("body", var);
        mod.addChild("functions", fn);

        // Validate
        AnnotationValidator validator;
        auto diags = validator.validate(&mod);
        bool foundMissing = false;
        for (const auto& d : diags) {
            if (d.message.find("Missing Intent") != std::string::npos)
                foundMissing = true;
        }
        assert(foundMissing && "Should detect missing deallocation intent");

        // Post-optimization invariant check
        StrategyValidator stratValidator;
        auto violations = stratValidator.validateInvariants(&mod);
        bool foundLeak = false;
        for (const auto& v : violations) {
            if (v.category == "leak") foundLeak = true;
        }
        assert(foundLeak && "Should detect leak in invariant check");

        std::cout << "Test 6 PASS: Annotation + invariant validation in pipeline" << std::endl;
        ++passed;

        delete var;
        delete anno;
        delete fn;
    }

    // --- Summary ---
    std::cout << "\n=== Step 72 Results: " << passed << " passed, " << failed << " failed ===" << std::endl;
    return failed > 0 ? 1 : 0;
}