// Copyright 2020 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#include "DiscIO/VolumeDisc.h"

#include <optional>
#include <string>

#include "Common/CommonTypes.h"
#include "DiscIO/Enums.h"

namespace DiscIO
{
std::string VolumeDisc::GetGameID(const Partition& partition) const
{
  char id[6];

  if (!Read(0, sizeof(id), reinterpret_cast<u8*>(id), partition))
    return std::string();

  return DecodeString(id);
}

Country VolumeDisc::GetCountry(const Partition& partition) const
{
  // The 0 that we use as a default value is mapped to Country::Unknown and Region::Unknown
  const u8 country_byte = ReadSwapped<u8>(3, partition).value_or(0);
  const Region region = GetRegion();
  const std::optional<u16> revision = GetRevision();

  if (CountryCodeToRegion(country_byte, GetVolumeType(), region, revision) != region)
    return TypicalCountryForRegion(region);

  return CountryCodeToCountry(country_byte, GetVolumeType(), region, revision);
}

Region VolumeDisc::RegionCodeToRegion(std::optional<u32> region_code) const
{
  if (!region_code)
    return Region::Unknown;

  const Region region = static_cast<Region>(*region_code);
  return region <= Region::NTSC_K ? region : Region::Unknown;
}

std::string VolumeDisc::GetMakerID(const Partition& partition) const
{
  char maker_id[2];

  if (!Read(0x4, sizeof(maker_id), reinterpret_cast<u8*>(&maker_id), partition))
    return std::string();

  return DecodeString(maker_id);
}

std::optional<u16> VolumeDisc::GetRevision(const Partition& partition) const
{
  std::optional<u8> revision = ReadSwapped<u8>(7, partition);
  return revision ? *revision : std::optional<u16>();
}

std::string VolumeDisc::GetInternalName(const Partition& partition) const
{
  char name[0x60];
  if (!Read(0x20, sizeof(name), reinterpret_cast<u8*>(&name), partition))
    return std::string();

  return DecodeString(name);
}

std::string VolumeDisc::GetApploaderDate(const Partition& partition) const
{
  char date[16];

  if (!Read(0x2440, sizeof(date), reinterpret_cast<u8*>(&date), partition))
    return std::string();

  return DecodeString(date);
}

std::optional<u8> VolumeDisc::GetDiscNumber(const Partition& partition) const
{
  return ReadSwapped<u8>(6, partition);
}

}  // namespace DiscIO