// Copyright 2018 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#include "DiscIO/WIABlob.h"

#include <memory>

#include "Common/CommonTypes.h"
#include "Common/File.h"
#include "Common/Logging/Log.h"
#include "Common/StringUtil.h"
#include "Common/Swap.h"

#include "DiscIO/VolumeWii.h"

namespace DiscIO
{
WIAFileReader::WIAFileReader(File::IOFile file, const std::string& path) : m_file(std::move(file))
{
  m_valid = Initialize(path);
}

WIAFileReader::~WIAFileReader() = default;

bool WIAFileReader::Initialize(const std::string& path)
{
  if (!m_file.Seek(0, SEEK_SET) || !m_file.ReadArray(&m_header_1, 1))
    return false;

  if (m_header_1.magic != WIA_MAGIC)
    return false;

  const u32 version = Common::swap32(m_header_1.version);
  const u32 version_compatible = Common::swap32(m_header_1.version_compatible);
  if (WIA_VERSION < version_compatible || WIA_VERSION_READ_COMPATIBLE > version)
  {
    ERROR_LOG(DISCIO, "Unsupported WIA version %s in %s", VersionToString(version).c_str(),
              path.c_str());
    return false;
  }

  if (Common::swap64(m_header_1.wia_file_size) != m_file.GetSize())
  {
    ERROR_LOG(DISCIO, "File size is incorrect for %s", path.c_str());
    return false;
  }

  if (Common::swap32(m_header_1.header_2_size) < sizeof(WIAHeader2))
    return false;

  if (!m_file.ReadArray(&m_header_2, 1))
    return false;

  const u32 chunk_size = Common::swap32(m_header_2.chunk_size);
  if (chunk_size % VolumeWii::GROUP_TOTAL_SIZE != 0)
    return false;

  return true;
}

std::unique_ptr<WIAFileReader> WIAFileReader::Create(File::IOFile file, const std::string& path)
{
  std::unique_ptr<WIAFileReader> blob(new WIAFileReader(std::move(file), path));
  return blob->m_valid ? std::move(blob) : nullptr;
}

bool WIAFileReader::Read(u64 offset, u64 size, u8* out_ptr)
{
  if (offset + size <= sizeof(WIAHeader2::disc_header))
  {
    std::memcpy(out_ptr, m_header_2.disc_header.data() + offset, size);
    return true;
  }

  // Not implemented
  return false;
}

std::string WIAFileReader::VersionToString(u32 version)
{
  const u8 a = version >> 24;
  const u8 b = (version >> 16) & 0xff;
  const u8 c = (version >> 8) & 0xff;
  const u8 d = version & 0xff;

  if (d == 0 || d == 0xff)
    return StringFromFormat("%u.%02x.%02x", a, b, c);
  else
    return StringFromFormat("%u.%02x.%02x.beta%u", a, b, c, d);
}
}  // namespace DiscIO