// Copyright 2017 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "gtest/gtest.h"

#include "dawn/EnumClassBitmasks.h"

namespace dawn {

enum class Color : uint32_t {
    R = 1,
    G = 2,
    B = 4,
    A = 8,
};

template <>
struct IsDawnBitmask<Color> {
    static constexpr bool enable = true;
};

TEST(BitmaskTests, BasicOperations) {
    Color test1 = Color::R | Color::G;
    ASSERT_EQ(1u | 2u, static_cast<uint32_t>(test1));

    Color test2 = test1 ^ (Color::R | Color::A);
    ASSERT_EQ(2u | 8u, static_cast<uint32_t>(test2));

    Color test3 = test2 & Color::A;
    ASSERT_EQ(8u, static_cast<uint32_t>(test3));

    Color test4 = ~test3;
    ASSERT_EQ(~uint32_t(8), static_cast<uint32_t>(test4));
}

TEST(BitmaskTests, AssignOperations) {
    Color test1 = Color::R;
    test1 |= Color::G;
    ASSERT_EQ(1u | 2u, static_cast<uint32_t>(test1));

    Color test2 = test1;
    test2 ^= (Color::R | Color::A);
    ASSERT_EQ(2u | 8u, static_cast<uint32_t>(test2));

    Color test3 = test2;
    test3 &= Color::A;
    ASSERT_EQ(8u, static_cast<uint32_t>(test3));
}

TEST(BitmaskTests, BoolConversion) {
    bool test1 = Color::R | Color::G;
    ASSERT_TRUE(test1);

    bool test2 = Color::R & Color::G;
    ASSERT_FALSE(test2);

    bool test3 = Color::R ^ Color::G;
    ASSERT_TRUE(test3);

    if (Color::R & ~Color::R) {
        ASSERT_TRUE(false);
    }
}

TEST(BitmaskTests, ThreeOrs) {
    Color c = Color::R | Color::G | Color::B;
    ASSERT_EQ(7u, static_cast<uint32_t>(c));
}

TEST(BitmaskTests, ZeroOrOneBits) {
    Color zero = static_cast<Color>(0);
    ASSERT_TRUE(HasZeroOrOneBits(zero));
    ASSERT_TRUE(HasZeroOrOneBits(Color::R));
    ASSERT_TRUE(HasZeroOrOneBits(Color::G));
    ASSERT_TRUE(HasZeroOrOneBits(Color::B));
    ASSERT_TRUE(HasZeroOrOneBits(Color::A));
    ASSERT_FALSE(HasZeroOrOneBits(static_cast<Color>(Color::R | Color::G)));
    ASSERT_FALSE(HasZeroOrOneBits(static_cast<Color>(Color::G | Color::B)));
    ASSERT_FALSE(HasZeroOrOneBits(static_cast<Color>(Color::B | Color::A)));
}

}  // namespace dawn