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

#include <gtest/gtest.h>

#include <array>
#include <cstring>
#include <type_traits>

namespace Bigfoot
{
class FileFixture: public ::testing::Test
{
  public:
    File m_file {eastl::string_view {"Fixture/file"}};
    File m_nonExistent {eastl::string_view {"Fixture/bigfoot"}};
    File m_writeScratchFile {eastl::string_view {"Fixture/scratch"}};

  protected:
    void SetUp() override
    {
        m_writeScratchFile.Delete();
    }
};

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

TEST_F(FileFixture, IsRelative_ShouldReturnTrueOnRelativeFile)
{
    EXPECT_TRUE(m_file.IsRelative());
}

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

TEST_F(FileFixture, IsRelative_ShouldReturnFalseOnAbsoluteFile)
{
    EXPECT_FALSE(m_file.ToAbsolute().IsRelative());
}

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

TEST_F(FileFixture, IsAbsolute_ShouldReturnTrueOnAbsoluteFile)
{
    EXPECT_TRUE(m_file.ToAbsolute().IsAbsolute());
}

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

TEST_F(FileFixture, IsAbsolute_ShouldReturnFalseOnRelativeFile)
{
    EXPECT_FALSE(m_file.IsAbsolute());
}

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

TEST_F(FileFixture, Exists_ShouldReturnTrueOnExistingFile)
{
    EXPECT_TRUE(m_file.Exists());
}

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

TEST_F(FileFixture, Exists_ShouldReturnFalseOnNonExistingFile)
{
    EXPECT_FALSE(m_nonExistent.Exists());
}

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

TEST_F(FileFixture, GetPath_ShouldReturnThePath)
{
    EXPECT_STREQ(m_file.GetPath().data(), "Fixture/file");
}

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

TEST_F(FileFixture, ToAbsolute_ShouldReturnTheAbsolutePath)
{
    EXPECT_STREQ(std::filesystem::absolute("Fixture/file").string().c_str(), m_file.ToAbsolute().GetPath().data());
}

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

TEST_F(FileFixture, ToRelative_ShouldReturnTheRelativePath)
{
    EXPECT_STREQ(std::filesystem::relative("Fixture/file").string().c_str(), m_file.ToRelative().GetPath().data());
}

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

TEST_F(FileFixture, GetSize_ShouldReturnZeroForAnEmptyFile)
{
    EXPECT_EQ(m_file.GetSize(), 0);
}

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

TEST_F(FileFixture, GetSize_ShouldReturnTheFileSize)
{
    constexpr eastl::string_view content = "Hello, Sasquatch!";
    m_writeScratchFile.Write({std::bit_cast<const std::byte*>(content.data()), content.size()}, 0);

    EXPECT_EQ(m_writeScratchFile.GetSize(), content.size());
}

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

TEST_F(FileFixture, Read_ShouldReturnTheRequestedBytesAtTheGivenOffset)
{
    constexpr eastl::string_view content = "Hello, Sasquatch!";
    m_writeScratchFile.Write({std::bit_cast<const std::byte*>(content.data()), content.size()}, 0);

    const eastl::vector<std::byte> data = m_writeScratchFile.Read(7, 10);
    ASSERT_EQ(data.size(), 10);
    EXPECT_EQ(std::memcmp(data.data(), "Sasquatch!", data.size()), 0);
}

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

TEST_F(FileFixture, Write_ShouldCreateTheFileWithTheGivenContent)
{
    constexpr eastl::string_view content = "Hello, Sasquatch!";
    m_writeScratchFile.Write({std::bit_cast<const std::byte*>(content.data()), content.size()}, 0);

    const eastl::vector<std::byte> data = m_writeScratchFile.Read(0, m_writeScratchFile.GetSize());
    ASSERT_EQ(data.size(), content.size());
    EXPECT_EQ(std::memcmp(data.data(), content.data(), data.size()), 0);
}

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

TEST_F(FileFixture, Write_ShouldNotTouchContentOutsideTheWrittenRange)
{
    constexpr eastl::string_view initial = "Hello, Sasquatch!";
    m_writeScratchFile.Write({std::bit_cast<const std::byte*>(initial.data()), initial.size()}, 0);

    constexpr eastl::string_view patch = "BIGFOOT";
    m_writeScratchFile.Write({std::bit_cast<const std::byte*>(patch.data()), patch.size()}, 7);

    const eastl::vector<std::byte> data = m_writeScratchFile.Read(0, m_writeScratchFile.GetSize());
    ASSERT_EQ(data.size(), initial.size());
    EXPECT_EQ(std::memcmp(data.data(), "Hello, ", 7), 0);
    EXPECT_EQ(std::memcmp(data.data() + 7, "BIGFOOT", 7), 0);
    EXPECT_EQ(std::memcmp(data.data() + 14, "ch!", 3), 0);
}

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

TEST_F(FileFixture, Write_ShouldRoundTripArbitraryData)
{
    struct Payload
    {
        int m_intValue;
        double m_doubleValue;
        std::array<char, 4> m_tag;

        bool operator==(const Payload&) const = default;
    };

    constexpr Payload payload {.m_intValue = 42, .m_doubleValue = 3.14, .m_tag = {'B', 'I', 'G', 'F'}};
    m_writeScratchFile.Write({std::bit_cast<const std::byte*>(&payload), sizeof(payload)}, 0);

    const eastl::vector<std::byte> data = m_writeScratchFile.Read(0, m_writeScratchFile.GetSize());
    ASSERT_EQ(data.size(), sizeof(Payload));
    EXPECT_EQ(*std::bit_cast<const Payload*>(data.data()), payload);
}

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

TEST_F(FileFixture, Delete_ShouldRemoveTheFile)
{
    constexpr std::byte payload {1};

    m_writeScratchFile.Write({&payload, 1}, 0);
    ASSERT_TRUE(m_writeScratchFile.Exists());

    m_writeScratchFile.Delete();
    EXPECT_FALSE(m_writeScratchFile.Exists());
}

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

TEST_F(FileFixture, Delete_ShouldDoNothingWhenTheFileDoesNotExist)
{
    ASSERT_FALSE(m_writeScratchFile.Exists());
    m_writeScratchFile.Delete();
    EXPECT_FALSE(m_writeScratchFile.Exists());
}
}   // namespace Bigfoot