// Copyright 2009 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#include <cstddef>
#include <cstring>
#include <locale>
#include <map>
#include <memory>
#include <string>
#include <utility>
#include <vector>

#include "Common/Align.h"
#include "Common/Assert.h"
#include "Common/CommonTypes.h"
#include "Common/Logging/Log.h"
#include "Common/MsgHandler.h"
#include "Common/StringUtil.h"
#include "DiscIO/Blob.h"
#include "DiscIO/Enums.h"
#include "DiscIO/Volume.h"
#include "DiscIO/VolumeWad.h"

namespace DiscIO
{
CVolumeWAD::CVolumeWAD(std::unique_ptr<IBlobReader> reader) : m_reader(std::move(reader))
{
  _assert_(m_reader);

  // Source: http://wiibrew.org/wiki/WAD_files
  ReadSwapped(0x00, &m_hdr_size, PARTITION_NONE);
  ReadSwapped(0x08, &m_cert_size, PARTITION_NONE);
  ReadSwapped(0x10, &m_tick_size, PARTITION_NONE);
  ReadSwapped(0x14, &m_tmd_size, PARTITION_NONE);
  ReadSwapped(0x18, &m_data_size, PARTITION_NONE);

  m_offset = Common::AlignUp(m_hdr_size, 0x40) + Common::AlignUp(m_cert_size, 0x40);
  m_tmd_offset = Common::AlignUp(m_hdr_size, 0x40) + Common::AlignUp(m_cert_size, 0x40) +
                 Common::AlignUp(m_tick_size, 0x40);
  m_opening_bnr_offset =
      m_tmd_offset + Common::AlignUp(m_tmd_size, 0x40) + Common::AlignUp(m_data_size, 0x40);

  if (m_tmd_size > 1024 * 1024 * 4)
  {
    ERROR_LOG(DISCIO, "TMD is too large: %u bytes", m_tmd_size);
    return;
  }

  std::vector<u8> tmd_buffer(m_tmd_size);
  Read(m_tmd_offset, m_tmd_size, tmd_buffer.data());
  m_tmd.SetBytes(std::move(tmd_buffer));
}

CVolumeWAD::~CVolumeWAD()
{
}

bool CVolumeWAD::Read(u64 offset, u64 length, u8* buffer, const Partition& partition) const
{
  if (partition != PARTITION_NONE)
    return false;

  return m_reader->Read(offset, length, buffer);
}

Region CVolumeWAD::GetRegion() const
{
  if (!m_tmd.IsValid())
    return Region::UNKNOWN_REGION;
  return m_tmd.GetRegion();
}

Country CVolumeWAD::GetCountry(const Partition& partition) const
{
  if (!m_tmd.IsValid())
    return Country::COUNTRY_UNKNOWN;

  u8 country_code = static_cast<u8>(m_tmd.GetTitleId() & 0xff);
  if (country_code == 2)  // SYSMENU
    return TypicalCountryForRegion(GetSysMenuRegion(m_tmd.GetTitleVersion()));

  return CountrySwitch(country_code);
}

IOS::ES::TMDReader CVolumeWAD::GetTMD(const Partition& partition) const
{
  return m_tmd;
}

std::string CVolumeWAD::GetGameID(const Partition& partition) const
{
  return m_tmd.GetGameID();
}

std::string CVolumeWAD::GetMakerID(const Partition& partition) const
{
  char temp[2];
  if (!Read(0x198 + m_tmd_offset, 2, (u8*)temp, partition))
    return "00";

  // Some weird channels use 0x0000 in place of the MakerID, so we need a check here
  const std::locale& c_locale = std::locale::classic();
  if (!std::isprint(temp[0], c_locale) || !std::isprint(temp[1], c_locale))
    return "00";

  return DecodeString(temp);
}

bool CVolumeWAD::GetTitleID(u64* buffer, const Partition& partition) const
{
  return ReadSwapped(m_offset + 0x01DC, buffer, partition);
}

u16 CVolumeWAD::GetRevision(const Partition& partition) const
{
  if (!m_tmd.IsValid())
    return 0;

  return m_tmd.GetTitleVersion();
}

Platform CVolumeWAD::GetVolumeType() const
{
  return Platform::WII_WAD;
}

std::map<Language, std::string> CVolumeWAD::GetLongNames() const
{
  if (!m_tmd.IsValid() || !IOS::ES::IsChannel(m_tmd.GetTitleId()))
    return {};

  std::vector<u8> name_data(NAMES_TOTAL_BYTES);
  if (!Read(m_opening_bnr_offset + 0x9C, NAMES_TOTAL_BYTES, name_data.data()))
    return std::map<Language, std::string>();
  return ReadWiiNames(name_data);
}

std::vector<u32> CVolumeWAD::GetBanner(int* width, int* height) const
{
  *width = 0;
  *height = 0;

  u64 title_id;
  if (!GetTitleID(&title_id))
    return std::vector<u32>();

  return GetWiiBanner(width, height, title_id);
}

BlobType CVolumeWAD::GetBlobType() const
{
  return m_reader->GetBlobType();
}

u64 CVolumeWAD::GetSize() const
{
  return m_reader->GetDataSize();
}

u64 CVolumeWAD::GetRawSize() const
{
  return m_reader->GetRawSize();
}

}  // namespace