/*********************************************************************
 * \file   UUID.cpp
 *
 * \author Romain BOULLARD
 * \date   October 2025
 *********************************************************************/
#include <System/UUID/UUID.hpp>

#include <ankerl/unordered_dense.h>

#include <gtest/gtest.h>

namespace Bigfoot
{
class UUIDFixture: public ::testing::Test
{
  protected:
    UUID m_a;
    UUID m_b {"47183823-2574-4bfd-b411-99ed177d3e43"};
    UUID m_c {"4bfd-b411-99ed177d3e43"};

    std::array<std::byte, 16> m_raw {
      std::byte {0},
      std::byte {1},
      std::byte {2},
      std::byte {3},
      std::byte {4},
      std::byte {5},
      std::byte {6},
      std::byte {7},
      std::byte {8},
      std::byte {9},
      std::byte {10},
      std::byte {11},
      std::byte {12},
      std::byte {13},
      std::byte {14},
      std::byte {15},
    };
    UUID m_d {m_raw};
};

/****************************************************************************************/

TEST_F(UUIDFixture, DumpingRawAndConstructAnUUIDWithItShouldGiveTheSameUUID)
{
    std::span<const std::byte, UUID::UUID_BYTE_SIZE> raw = m_a;
    EXPECT_EQ(m_a, UUID {raw});

    raw = m_b;
    EXPECT_EQ(m_b, UUID {raw});

    raw = m_d;
    EXPECT_EQ(m_d, UUID {raw});
}

/****************************************************************************************/

TEST_F(UUIDFixture, ValidIDFromStringShouldBeEqualToString)
{
    EXPECT_EQ(static_cast<std::string>(m_b), "47183823-2574-4bfd-b411-99ed177d3e43");
}

/****************************************************************************************/

TEST_F(UUIDFixture, InvalidIDFromStringShouldNotBeEqualToString)
{
    EXPECT_NE(static_cast<std::string>(m_c), "4bfd-b411-99ed177d3e43");
}

/****************************************************************************************/

TEST_F(UUIDFixture, NullIDStringShouldBeEqualToNullIDString)
{
    EXPECT_EQ(static_cast<std::string>(UUID::NULL_UUID), "00000000-0000-0000-0000-000000000000");
}

/****************************************************************************************/

TEST_F(UUIDFixture, DefaultConstructedIDShouldBeValid)
{
    EXPECT_TRUE(m_a);
}

/****************************************************************************************/

TEST_F(UUIDFixture, StringConstructedIDFromAValidStringShouldBeValid)
{
    EXPECT_TRUE(m_b);
}

/****************************************************************************************/

TEST_F(UUIDFixture, StringConstructedIDFromAnInvalidStringShouldBeInvalid)
{
    EXPECT_FALSE(m_c);
}

/****************************************************************************************/

TEST_F(UUIDFixture, RawConstructedIDShouldBeValid)
{
    EXPECT_TRUE(m_d);
}

/****************************************************************************************/

TEST_F(UUIDFixture, ConstructingFromRawShouldAlwaysGiveTheSameUUID)
{
    EXPECT_EQ(m_d, UUID {"00010203-0405-0607-0809-0a0b0c0d0e0f"});
}

/****************************************************************************************/

TEST_F(UUIDFixture, NullIDShouldNotBeValid)
{
    EXPECT_FALSE(UUID::NULL_UUID);
}

/****************************************************************************************/

TEST_F(UUIDFixture, IDShouldBeEqualToItself)
{
    EXPECT_EQ(m_a, m_a);
}

/****************************************************************************************/

TEST_F(UUIDFixture, IDConstructedFromOtherIDShouldBeEqual)
{
    EXPECT_EQ(m_a, UUID {m_a});
}

/****************************************************************************************/

TEST_F(UUIDFixture, IDCopiedFromOtherIDShouldBeEqual)
{
    const UUID m_aDuplicate = m_a;
    EXPECT_EQ(m_a, m_aDuplicate);
}

/****************************************************************************************/

TEST_F(UUIDFixture, ValidIDsShouldNotBeEqualToNullID)
{
    EXPECT_NE(m_a, UUID::NULL_UUID);
    EXPECT_NE(m_b, UUID::NULL_UUID);
    EXPECT_NE(m_d, UUID::NULL_UUID);
}

/****************************************************************************************/

TEST_F(UUIDFixture, InvalidIDsShouldBeEqualToNullID)
{
    EXPECT_EQ(m_c, UUID::NULL_UUID);
}

/****************************************************************************************/

TEST_F(UUIDFixture, GeneratingFiveMillionUniqueID)
{
    ankerl::unordered_dense::set<UUID> m_ids;

    for (std::uint32_t index = 0; index < 5'000'000; ++index)
    {
        EXPECT_TRUE(m_ids.insert(UUID {}).second);
    }
}

/****************************************************************************************/

TEST_F(UUIDFixture, Raw_ShouldGiveBackTheRawDataOfTheID)
{
    std::span<const std::byte, UUID::UUID_BYTE_SIZE> d = m_d;
    std::span<const std::byte, UUID::UUID_BYTE_SIZE> raw = m_raw;

    for (std::uint32_t i = 0; i < UUID::UUID_BYTE_SIZE; ++i)
    {
        EXPECT_EQ(d[i], raw[i]);
    }
}
}   // namespace Bigfoot