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#ifndef SRC_TINT_LANG_MSL_WRITER_AST_PRINTER_HELPER_TEST_H_
#define SRC_TINT_LANG_MSL_WRITER_AST_PRINTER_HELPER_TEST_H_

#include <memory>
#include <string>
#include <utility>

#include "gtest/gtest.h"
#include "src/tint/lang/msl/writer/ast_printer/ast_printer.h"
#include "src/tint/lang/wgsl/program/program_builder.h"
#include "src/tint/lang/wgsl/resolver/resolve.h"

namespace tint::msl::writer {

/// Helper class for testing
template <typename BASE>
class TestHelperBase : public BASE, public ProgramBuilder {
  public:
    TestHelperBase() = default;
    ~TestHelperBase() override = default;

    /// @returns the default generator options for SanitizeAndBuild(), if no explicit options are
    /// provided.
    static Options DefaultOptions() {
        Options opts;
        opts.disable_robustness = true;
        return opts;
    }

    /// Builds and returns a ASTPrinter from the program.
    /// @note The generator is only built once. Multiple calls to Build() will
    /// return the same ASTPrinter without rebuilding.
    /// @return the built generator
    ASTPrinter& Build() {
        if (gen_) {
            return *gen_;
        }
        if (!IsValid()) {
            ADD_FAILURE() << "ProgramBuilder is not valid: " << Diagnostics();
        }
        program = std::make_unique<Program>(resolver::Resolve(*this));
        if (!program->IsValid()) {
            ADD_FAILURE() << program->Diagnostics();
        }
        gen_ = std::make_unique<ASTPrinter>(*program);
        return *gen_;
    }

    /// Builds the program, runs the program through the transform::Msl sanitizer
    /// and returns a ASTPrinter from the sanitized program.
    /// @param options The MSL generator options.
    /// @note The generator is only built once. Multiple calls to Build() will
    /// return the same ASTPrinter without rebuilding.
    /// @return the built generator
    ASTPrinter& SanitizeAndBuild(const Options& options = DefaultOptions()) {
        if (gen_) {
            return *gen_;
        }
        if (!IsValid()) {
            ADD_FAILURE() << "ProgramBuilder is not valid: " << Diagnostics();
        }
        program = std::make_unique<Program>(resolver::Resolve(*this));
        if (!program->IsValid()) {
            ADD_FAILURE() << program->Diagnostics();
        }

        auto result = Sanitize(*program, options);
        if (!result.program.IsValid()) {
            ADD_FAILURE() << result.program.Diagnostics();
        }
        *program = std::move(result.program);
        gen_ = std::make_unique<ASTPrinter>(*program);
        return *gen_;
    }

    /// The program built with a call to Build()
    std::unique_ptr<Program> program;

  private:
    std::unique_ptr<ASTPrinter> gen_;
};

/// Test helper
using TestHelper = TestHelperBase<testing::Test>;

/// Param test helper
template <typename T>
using TestParamHelper = TestHelperBase<testing::TestWithParam<T>>;

}  // namespace tint::msl::writer

#endif  // SRC_TINT_LANG_MSL_WRITER_AST_PRINTER_HELPER_TEST_H_