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// GEN_BUILD:CONDITION(tint_build_glsl_validator)

#ifndef SRC_TINT_LANG_GLSL_WRITER_HELPER_TEST_H_
#define SRC_TINT_LANG_GLSL_WRITER_HELPER_TEST_H_

#include <string>

#include "gtest/gtest.h"
#include "src/tint/lang/core/ir/builder.h"
#include "src/tint/lang/glsl/validate/validate.h"
#include "src/tint/lang/glsl/writer/writer.h"
#include "src/tint/utils/text/string.h"

namespace tint::glsl::writer {

/// Base helper class for testing the GLSL generator implementation.
template <typename BASE>
class GlslWriterTestHelperBase : 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()};
    /// The GLSL version
    Version version{};

  protected:
    /// Generated GLSL
    Output output_;

    /// Run the writer on the IR module and validate the result.
    /// @param options the writer options
    /// @returns the success or failure
    Result<SuccessType> Generate(Options options = {}) {
        mod.enable_validation_asserts = true;

        options.entry_point_name = "main";
        auto result = writer::Generate(mod, options);
        TINT_CHECK_RESULT(result);
        output_ = result.Get();

        core::ir::Function::PipelineStage stage = core::ir::Function::PipelineStage::kUndefined;
        for (auto* func : mod.functions) {
            if (func->IsEntryPoint()) {
                stage = func->Stage();
                break;
            }
        }
        TINT_ASSERT(stage != core::ir::Function::PipelineStage::kUndefined);

        auto validate_res = glsl::validate::Validate(output_.glsl, stage);
        if (validate_res != Success) {
            size_t line_num = 1;

            std::stringstream err;
            err << "GLSLang was expected to succeed, but failed:\n\n";
            for (auto line : Split(output_.glsl, "\n")) {
                err << line_num++ << ": " << line << "\n";
            }
            err << "\n\n" << validate_res.Failure();
            return Failure(err.str());
        }

        return Success;
    }

    /// @returns the glsl header string
    std::string GlslHeader() const {
        std::stringstream ver;
        ver << "#version " << version.major_version << version.minor_version << "0";
        if (version.IsES()) {
            ver << " es";
        }
        ver << "\n";
        return ver.str();
    }
};

/// Test class
using GlslWriterTest = GlslWriterTestHelperBase<testing::Test>;

/// Test param class
template <typename T>
using GlslWriterTestWithParam = GlslWriterTestHelperBase<testing::TestWithParam<T>>;

}  // namespace tint::glsl::writer

#endif  // SRC_TINT_LANG_GLSL_WRITER_HELPER_TEST_H_
