// 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.
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// 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
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#include <array>

#include "gtest/gtest.h"
#include "src/dawn/native/EnumMaskIterator.h"
#include "src/utils/compiler.h"

namespace dawn::native {

enum class TestAspect : uint8_t {
    Color = 1,
    Depth = 2,
    Stencil = 4,
};

template <>
struct EnumBitmaskSize<TestAspect> {
    static constexpr unsigned value = 3;
};

}  // namespace dawn::native

template <>
struct wgpu::IsWGPUBitmask<dawn::native::TestAspect> {
    static constexpr bool enable = true;
};

namespace dawn::native {

static_assert(EnumBitmaskSize<TestAspect>::value == 3);

TEST(EnumMaskIteratorTests, None) {
    for ([[maybe_unused]] TestAspect aspect : IterateEnumMask(static_cast<TestAspect>(0))) {
        // Silence a -Wunreachable-code-loop-increment
        if ((0)) {
            continue;
        }
        FAIL();
    }
}

TEST(EnumMaskIteratorTests, All) {
    std::array expected = {
        TestAspect::Color,
        TestAspect::Depth,
        TestAspect::Stencil,
    };
    uint32_t i = 0;
    TestAspect aspects = TestAspect::Color | TestAspect::Depth | TestAspect::Stencil;
    for (TestAspect aspect : IterateEnumMask(aspects)) {
        DAWN_UNSAFE_TODO(EXPECT_EQ(aspect, expected[i++]));
    }
}

TEST(EnumMaskIteratorTests, Partial) {
    std::array expected = {TestAspect::Color, TestAspect::Stencil};
    uint32_t i = 0;
    TestAspect aspects = TestAspect::Stencil | TestAspect::Color;
    for (TestAspect aspect : IterateEnumMask(aspects)) {
        DAWN_UNSAFE_TODO(EXPECT_EQ(aspect, expected[i++]));
    }
}

}  // namespace dawn::native