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#ifndef SRC_TINT_LANG_MSL_WRITER_HELPER_TEST_H_
#define SRC_TINT_LANG_MSL_WRITER_HELPER_TEST_H_

#include <iostream>
#include <string>

#include "gtest/gtest.h"
#include "src/tint/lang/core/ir/builder.h"
#include "src/tint/lang/core/ir/validator.h"
#include "src/tint/lang/msl/validate/validate.h"
#include "src/tint/lang/msl/writer/writer.h"

namespace tint::msl::writer {

/// Metal header declaration
constexpr auto kMetalHeader = R"(#include <metal_stdlib>
using namespace metal;
)";

/// Metal array declaration
constexpr auto kMetalArray = R"(template<typename T, size_t N>
struct tint_array {
  const constant T& operator[](size_t i) const constant { return elements[i]; }
  device T& operator[](size_t i) device { return elements[i]; }
  const device T& operator[](size_t i) const device { return elements[i]; }
  thread T& operator[](size_t i) thread { return elements[i]; }
  const thread T& operator[](size_t i) const thread { return elements[i]; }
  threadgroup T& operator[](size_t i) threadgroup { return elements[i]; }
  const threadgroup T& operator[](size_t i) const threadgroup { return elements[i]; }
  T elements[N];
};

)";

/// Base helper class for testing the MSL writer implementation.
template <typename BASE>
class MslWriterTestHelperBase : public BASE {
  public:
    /// The test module.
    core::ir::Module mod;
    /// The test builder.
    core::ir::Builder b{mod};
    /// The type manager.
    core::type::Manager& ty{mod.Types()};

  protected:
    /// Validation errors
    std::string err_;

    /// Generated MSL
    Output output_;

    /// Run the writer on the IR module and validate the result.
    /// @returns true if generation and validation succeeded
    bool Generate() {
        Options options;
        auto result = writer::Generate(mod, options);
        if (result != Success) {
            err_ = result.Failure().reason.Str();
            return false;
        }
        output_ = result.Get();

#if TINT_BUILD_IS_MAC
        auto msl_validation =
            validate::ValidateUsingMetal(output_.msl, validate::MslVersion::kMsl_2_3);
        if (msl_validation.failed) {
            err_ = msl_validation.output;
            return false;
        }
#endif

        return true;
    }

    /// @returns the metal header string
    std::string MetalHeader() const { return kMetalHeader; }
    /// @return the metal array string
    std::string MetalArray() const { return kMetalArray; }
};

/// Printer tests
using MslWriterTest = MslWriterTestHelperBase<testing::Test>;

/// Printer param tests
template <typename T>
using MslWriterTestWithParam = MslWriterTestHelperBase<testing::TestWithParam<T>>;

}  // namespace tint::msl::writer

#endif  // SRC_TINT_LANG_MSL_WRITER_HELPER_TEST_H_