//------------------------------------------------------------------------------
/*
    This file is part of clio: https://github.com/XRPLF/clio
    Copyright (c) 2025, the clio developers.

    Permission to use, copy, modify, and distribute this software for any
    purpose with or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.

    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL,  DIRECT,  INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================

#include "data/impl/OutputFile.hpp"
#include "util/Shasum.hpp"
#include "util/TmpFile.hpp"

#include <gtest/gtest.h>

#include <cstddef>
#include <cstdint>
#include <fstream>
#include <ios>
#include <iterator>
#include <numbers>
#include <string>
#include <vector>

using namespace data::impl;

struct OutputFileTest : ::testing::Test {
    TmpFile tmpFile = TmpFile::empty();

    std::string
    readFileContents() const
    {
        std::ifstream ifs(tmpFile.path, std::ios::binary);
        return std::string{std::istreambuf_iterator<char>{ifs}, std::istreambuf_iterator<char>{}};
    }
};

TEST_F(OutputFileTest, ConstructorOpensFile)
{
    OutputFile const file(tmpFile.path);
    EXPECT_TRUE(file.isOpen());
}

TEST_F(OutputFileTest, NonExistingFile)
{
    std::string const invalidPath = "/invalid/nonexistent/directory/file.dat";
    OutputFile const file(invalidPath);
    EXPECT_FALSE(file.isOpen());
}

TEST_F(OutputFileTest, WriteBasicTypes)
{
    uint32_t const intValue = 0x12345678;
    double const doubleValue = std::numbers::pi;
    char const charValue = 'A';
    {
        OutputFile file(tmpFile.path);

        file.write(intValue);
        file.write(doubleValue);
        file.write(charValue);
    }

    std::string contents = readFileContents();
    EXPECT_EQ(contents.size(), sizeof(intValue) + sizeof(doubleValue) + sizeof(charValue));

    auto* data = reinterpret_cast<char const*>(contents.data());
    EXPECT_EQ(*reinterpret_cast<uint32_t const*>(data), intValue);
    EXPECT_EQ(*reinterpret_cast<double const*>(data + sizeof(intValue)), doubleValue);
    EXPECT_EQ(*(data + sizeof(intValue) + sizeof(doubleValue)), charValue);
}

TEST_F(OutputFileTest, WriteArray)
{
    std::vector<uint32_t> const data = {0x11111111, 0x22222222, 0x33333333, 0x44444444};

    {
        OutputFile file(tmpFile.path);
        file.write(data.data(), data.size() * sizeof(uint32_t));
    }

    std::string contents = readFileContents();
    EXPECT_EQ(contents.size(), data.size() * sizeof(uint32_t));

    auto* readData = reinterpret_cast<uint32_t const*>(contents.data());
    for (size_t i = 0; i < data.size(); ++i) {
        EXPECT_EQ(readData[i], data[i]);
    }
}

TEST_F(OutputFileTest, WriteRawData)
{
    std::string const testData = "Hello, World!";
    {
        OutputFile file(tmpFile.path);
        file.writeRaw(testData.data(), testData.size());
    }

    std::string const contents = readFileContents();
    EXPECT_EQ(contents, testData);
}

TEST_F(OutputFileTest, WriteMultipleChunks)
{
    std::string chunk1 = "First chunk";
    std::string chunk2 = "Second chunk";
    std::string chunk3 = "Third chunk";

    {
        OutputFile file(tmpFile.path);

        file.writeRaw(chunk1.data(), chunk1.size());
        file.writeRaw(chunk2.data(), chunk2.size());
        file.writeRaw(chunk3.data(), chunk3.size());
    }

    std::string const contents = readFileContents();
    EXPECT_EQ(contents, chunk1 + chunk2 + chunk3);
}

TEST_F(OutputFileTest, HashOfEmptyFile)
{
    OutputFile const file(tmpFile.path);
    ASSERT_TRUE(file.isOpen());

    // Hash of empty file should match SHA256 of empty string
    EXPECT_EQ(file.hash(), util::sha256sum(""));
}

TEST_F(OutputFileTest, HashAfterWriting)
{
    std::string const testData = "Hello, World!";
    {
        OutputFile file(tmpFile.path);
        file.writeRaw(testData.data(), testData.size());

        // Hash should match SHA256 of the written data
        EXPECT_EQ(file.hash(), util::sha256sum(testData));
    }
}

TEST_F(OutputFileTest, HashProgressesWithWrites)
{
    std::string const part1 = "Hello, ";
    std::string const part2 = "World!";
    std::string const combined = part1 + part2;

    OutputFile file(tmpFile.path);
    ASSERT_TRUE(file.isOpen());

    EXPECT_EQ(file.hash(), util::sha256sum(""));

    file.writeRaw(part1.data(), part1.size());
    EXPECT_EQ(file.hash(), util::sha256sum(part1));

    file.writeRaw(part2.data(), part2.size());
    EXPECT_EQ(file.hash(), util::sha256sum(combined));
}