// Copyright 2020 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef SRC_TINT_LANG_WGSL_WRITER_AST_PRINTER_HELPER_TEST_H_
#define SRC_TINT_LANG_WGSL_WRITER_AST_PRINTER_HELPER_TEST_H_

#include <memory>
#include <utility>

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

namespace tint::wgsl::writer {

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

    ~TestHelperBase() override = default;

    /// Builds and returns a ASTPrinter from the program.
    /// @param resolve if true, the program will be resolved before returning
    /// @note The generator is only built once. Multiple calls to Build() will
    /// return the same ASTPrinter without rebuilding.
    /// @return the built generator
    ASTPrinter& Build(bool resolve = true) {
        if (gen_) {
            return *gen_;
        }
        if (resolve) {
            program = std::make_unique<Program>(resolver::Resolve(*this));
        } else {
            program = std::make_unique<Program>(std::move(*this));
        }
        if (!program->IsValid()) {
            ADD_FAILURE() << program->Diagnostics();
        }
        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_;
};
using TestHelper = TestHelperBase<testing::Test>;

template <typename T>
using TestParamHelper = TestHelperBase<testing::TestWithParam<T>>;

}  // namespace tint::wgsl::writer

#endif  // SRC_TINT_LANG_WGSL_WRITER_AST_PRINTER_HELPER_TEST_H_