// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include "common/assert.h"
#include "common/common_types.h"
#include "common/file_util.h"
#include "common/logging/log.h"
#include "common/scope_exit.h"
#include "common/string_util.h"
#include "core/hle/kernel/client_session.h"
#include "core/hle/result.h"
#include "core/hle/service/fs/archive.h"
#include "core/hle/service/fs/fs_user.h"
#include "core/settings.h"

////////////////////////////////////////////////////////////////////////////////////////////////////
// Namespace FS_User

using Kernel::SharedPtr;
using Kernel::ServerSession;

namespace Service {
namespace FS {

static u32 priority = -1; ///< For SetPriority and GetPriority service functions

static ArchiveHandle MakeArchiveHandle(u32 low_word, u32 high_word) {
    return (u64)low_word | ((u64)high_word << 32);
}

static void Initialize(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    // TODO(Link Mauve): check the behavior when cmd_buff[1] isn't 32, as per
    // http://3dbrew.org/wiki/FS:Initialize#Request
    cmd_buff[1] = RESULT_SUCCESS.raw;
}

/**
 * FS_User::OpenFile service function
 *  Inputs:
 *      1 : Transaction
 *      2 : Archive handle lower word
 *      3 : Archive handle upper word
 *      4 : Low path type
 *      5 : Low path size
 *      6 : Open flags
 *      7 : Attributes
 *      8 : (LowPathSize << 14) | 2
 *      9 : Low path data pointer
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 *      3 : File handle
 */
static void OpenFile(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    ArchiveHandle archive_handle = MakeArchiveHandle(cmd_buff[2], cmd_buff[3]);
    auto filename_type = static_cast<FileSys::LowPathType>(cmd_buff[4]);
    u32 filename_size = cmd_buff[5];
    FileSys::Mode mode;
    mode.hex = cmd_buff[6];
    u32 attributes = cmd_buff[7]; // TODO(Link Mauve): do something with those attributes.
    u32 filename_ptr = cmd_buff[9];
    FileSys::Path file_path(filename_type, filename_size, filename_ptr);

    LOG_DEBUG(Service_FS, "path=%s, mode=%u attrs=%u", file_path.DebugStr().c_str(), mode.hex,
              attributes);

    ResultVal<std::shared_ptr<File>> file_res =
        OpenFileFromArchive(archive_handle, file_path, mode);
    cmd_buff[1] = file_res.Code().raw;
    if (file_res.Succeeded()) {
        std::shared_ptr<File> file = *file_res;
        auto sessions = ServerSession::CreateSessionPair(file->GetName(), file);
        file->ClientConnected(std::get<Kernel::SharedPtr<Kernel::ServerSession>>(sessions));
        cmd_buff[3] = Kernel::g_handle_table
                          .Create(std::get<Kernel::SharedPtr<Kernel::ClientSession>>(sessions))
                          .MoveFrom();
    } else {
        cmd_buff[3] = 0;
        LOG_ERROR(Service_FS, "failed to get a handle for file %s", file_path.DebugStr().c_str());
    }
}

/**
 * FS_User::OpenFileDirectly service function
 *  Inputs:
 *      1 : Transaction
 *      2 : Archive ID
 *      3 : Archive low path type
 *      4 : Archive low path size
 *      5 : File low path type
 *      6 : File low path size
 *      7 : Flags
 *      8 : Attributes
 *      9 : (ArchiveLowPathSize << 14) | 0x802
 *      10 : Archive low path
 *      11 : (FileLowPathSize << 14) | 2
 *      12 : File low path
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 *      3 : File handle
 */
static void OpenFileDirectly(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    auto archive_id = static_cast<FS::ArchiveIdCode>(cmd_buff[2]);
    auto archivename_type = static_cast<FileSys::LowPathType>(cmd_buff[3]);
    u32 archivename_size = cmd_buff[4];
    auto filename_type = static_cast<FileSys::LowPathType>(cmd_buff[5]);
    u32 filename_size = cmd_buff[6];
    FileSys::Mode mode;
    mode.hex = cmd_buff[7];
    u32 attributes = cmd_buff[8]; // TODO(Link Mauve): do something with those attributes.
    u32 archivename_ptr = cmd_buff[10];
    u32 filename_ptr = cmd_buff[12];
    FileSys::Path archive_path(archivename_type, archivename_size, archivename_ptr);
    FileSys::Path file_path(filename_type, filename_size, filename_ptr);

    LOG_DEBUG(Service_FS, "archive_id=0x%08X archive_path=%s file_path=%s, mode=%u attributes=%u",
              static_cast<u32>(archive_id), archive_path.DebugStr().c_str(),
              file_path.DebugStr().c_str(), mode.hex, attributes);

    ResultVal<ArchiveHandle> archive_handle = OpenArchive(archive_id, archive_path);
    if (archive_handle.Failed()) {
        LOG_ERROR(Service_FS,
                  "failed to get a handle for archive archive_id=0x%08X archive_path=%s",
                  static_cast<u32>(archive_id), archive_path.DebugStr().c_str());
        cmd_buff[1] = archive_handle.Code().raw;
        cmd_buff[3] = 0;
        return;
    }
    SCOPE_EXIT({ CloseArchive(*archive_handle); });

    ResultVal<std::shared_ptr<File>> file_res =
        OpenFileFromArchive(*archive_handle, file_path, mode);
    cmd_buff[1] = file_res.Code().raw;
    if (file_res.Succeeded()) {
        std::shared_ptr<File> file = *file_res;
        auto sessions = ServerSession::CreateSessionPair(file->GetName(), file);
        file->ClientConnected(std::get<Kernel::SharedPtr<Kernel::ServerSession>>(sessions));
        cmd_buff[3] = Kernel::g_handle_table
                          .Create(std::get<Kernel::SharedPtr<Kernel::ClientSession>>(sessions))
                          .MoveFrom();
    } else {
        cmd_buff[3] = 0;
        LOG_ERROR(Service_FS, "failed to get a handle for file %s mode=%u attributes=%u",
                  file_path.DebugStr().c_str(), mode.hex, attributes);
    }
}

/*
 * FS_User::DeleteFile service function
 *  Inputs:
 *      2 : Archive handle lower word
 *      3 : Archive handle upper word
 *      4 : File path string type
 *      5 : File path string size
 *      7 : File path string data
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 */
static void DeleteFile(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    ArchiveHandle archive_handle = MakeArchiveHandle(cmd_buff[2], cmd_buff[3]);
    auto filename_type = static_cast<FileSys::LowPathType>(cmd_buff[4]);
    u32 filename_size = cmd_buff[5];
    u32 filename_ptr = cmd_buff[7];

    FileSys::Path file_path(filename_type, filename_size, filename_ptr);

    LOG_DEBUG(Service_FS, "type=%u size=%u data=%s", static_cast<u32>(filename_type), filename_size,
              file_path.DebugStr().c_str());

    cmd_buff[1] = DeleteFileFromArchive(archive_handle, file_path).raw;
}

/*
 * FS_User::RenameFile service function
 *  Inputs:
 *      2 : Source archive handle lower word
 *      3 : Source archive handle upper word
 *      4 : Source file path type
 *      5 : Source file path size
 *      6 : Dest archive handle lower word
 *      7 : Dest archive handle upper word
 *      8 : Dest file path type
 *      9 : Dest file path size
 *      11: Source file path string data
 *      13: Dest file path string
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 */
static void RenameFile(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    ArchiveHandle src_archive_handle = MakeArchiveHandle(cmd_buff[2], cmd_buff[3]);
    auto src_filename_type = static_cast<FileSys::LowPathType>(cmd_buff[4]);
    u32 src_filename_size = cmd_buff[5];
    ArchiveHandle dest_archive_handle = MakeArchiveHandle(cmd_buff[6], cmd_buff[7]);
    ;
    auto dest_filename_type = static_cast<FileSys::LowPathType>(cmd_buff[8]);
    u32 dest_filename_size = cmd_buff[9];
    u32 src_filename_ptr = cmd_buff[11];
    u32 dest_filename_ptr = cmd_buff[13];

    FileSys::Path src_file_path(src_filename_type, src_filename_size, src_filename_ptr);
    FileSys::Path dest_file_path(dest_filename_type, dest_filename_size, dest_filename_ptr);

    LOG_DEBUG(Service_FS,
              "src_type=%u src_size=%u src_data=%s dest_type=%u dest_size=%u dest_data=%s",
              static_cast<u32>(src_filename_type), src_filename_size,
              src_file_path.DebugStr().c_str(), static_cast<u32>(dest_filename_type),
              dest_filename_size, dest_file_path.DebugStr().c_str());

    cmd_buff[1] = RenameFileBetweenArchives(src_archive_handle, src_file_path, dest_archive_handle,
                                            dest_file_path)
                      .raw;
}

/*
 * FS_User::DeleteDirectory service function
 *  Inputs:
 *      2 : Archive handle lower word
 *      3 : Archive handle upper word
 *      4 : Directory path string type
 *      5 : Directory path string size
 *      7 : Directory path string data
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 */
static void DeleteDirectory(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    ArchiveHandle archive_handle = MakeArchiveHandle(cmd_buff[2], cmd_buff[3]);
    auto dirname_type = static_cast<FileSys::LowPathType>(cmd_buff[4]);
    u32 dirname_size = cmd_buff[5];
    u32 dirname_ptr = cmd_buff[7];

    FileSys::Path dir_path(dirname_type, dirname_size, dirname_ptr);

    LOG_DEBUG(Service_FS, "type=%u size=%u data=%s", static_cast<u32>(dirname_type), dirname_size,
              dir_path.DebugStr().c_str());

    cmd_buff[1] = DeleteDirectoryFromArchive(archive_handle, dir_path).raw;
}

/*
 * FS_User::DeleteDirectoryRecursively service function
 *  Inputs:
 *      0 : Command header 0x08070142
 *      1 : Transaction
 *      2 : Archive handle lower word
 *      3 : Archive handle upper word
 *      4 : Directory path string type
 *      5 : Directory path string size
 *      7 : Directory path string data
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 */
static void DeleteDirectoryRecursively(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    ArchiveHandle archive_handle = MakeArchiveHandle(cmd_buff[2], cmd_buff[3]);
    auto dirname_type = static_cast<FileSys::LowPathType>(cmd_buff[4]);
    u32 dirname_size = cmd_buff[5];
    u32 dirname_ptr = cmd_buff[7];

    FileSys::Path dir_path(dirname_type, dirname_size, dirname_ptr);

    LOG_DEBUG(Service_FS, "type=%u size=%u data=%s", static_cast<u32>(dirname_type), dirname_size,
              dir_path.DebugStr().c_str());

    cmd_buff[1] = DeleteDirectoryRecursivelyFromArchive(archive_handle, dir_path).raw;
}

/*
 * FS_User::CreateFile service function
 *  Inputs:
 *      0 : Command header 0x08080202
 *      2 : Archive handle lower word
 *      3 : Archive handle upper word
 *      4 : File path string type
 *      5 : File path string size
 *      7-8 : File size
 *      10: File path string data
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 */
static void CreateFile(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    ArchiveHandle archive_handle = MakeArchiveHandle(cmd_buff[2], cmd_buff[3]);
    auto filename_type = static_cast<FileSys::LowPathType>(cmd_buff[4]);
    u32 filename_size = cmd_buff[5];
    u64 file_size = ((u64)cmd_buff[8] << 32) | cmd_buff[7];
    u32 filename_ptr = cmd_buff[10];

    FileSys::Path file_path(filename_type, filename_size, filename_ptr);

    LOG_DEBUG(Service_FS, "type=%u size=%llu data=%s", static_cast<u32>(filename_type), file_size,
              file_path.DebugStr().c_str());

    cmd_buff[1] = CreateFileInArchive(archive_handle, file_path, file_size).raw;
}

/*
 * FS_User::CreateDirectory service function
 *  Inputs:
 *      2 : Archive handle lower word
 *      3 : Archive handle upper word
 *      4 : Directory path string type
 *      5 : Directory path string size
 *      8 : Directory path string data
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 */
static void CreateDirectory(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    ArchiveHandle archive_handle = MakeArchiveHandle(cmd_buff[2], cmd_buff[3]);
    auto dirname_type = static_cast<FileSys::LowPathType>(cmd_buff[4]);
    u32 dirname_size = cmd_buff[5];
    u32 dirname_ptr = cmd_buff[8];

    FileSys::Path dir_path(dirname_type, dirname_size, dirname_ptr);

    LOG_DEBUG(Service_FS, "type=%u size=%d data=%s", static_cast<u32>(dirname_type), dirname_size,
              dir_path.DebugStr().c_str());

    cmd_buff[1] = CreateDirectoryFromArchive(archive_handle, dir_path).raw;
}

/*
 * FS_User::RenameDirectory service function
 *  Inputs:
 *      2 : Source archive handle lower word
 *      3 : Source archive handle upper word
 *      4 : Source dir path type
 *      5 : Source dir path size
 *      6 : Dest archive handle lower word
 *      7 : Dest archive handle upper word
 *      8 : Dest dir path type
 *      9 : Dest dir path size
 *      11: Source dir path string data
 *      13: Dest dir path string
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 */
static void RenameDirectory(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    ArchiveHandle src_archive_handle = MakeArchiveHandle(cmd_buff[2], cmd_buff[3]);
    auto src_dirname_type = static_cast<FileSys::LowPathType>(cmd_buff[4]);
    u32 src_dirname_size = cmd_buff[5];
    ArchiveHandle dest_archive_handle = MakeArchiveHandle(cmd_buff[6], cmd_buff[7]);
    auto dest_dirname_type = static_cast<FileSys::LowPathType>(cmd_buff[8]);
    u32 dest_dirname_size = cmd_buff[9];
    u32 src_dirname_ptr = cmd_buff[11];
    u32 dest_dirname_ptr = cmd_buff[13];

    FileSys::Path src_dir_path(src_dirname_type, src_dirname_size, src_dirname_ptr);
    FileSys::Path dest_dir_path(dest_dirname_type, dest_dirname_size, dest_dirname_ptr);

    LOG_DEBUG(
        Service_FS, "src_type=%u src_size=%u src_data=%s dest_type=%u dest_size=%u dest_data=%s",
        static_cast<u32>(src_dirname_type), src_dirname_size, src_dir_path.DebugStr().c_str(),
        static_cast<u32>(dest_dirname_type), dest_dirname_size, dest_dir_path.DebugStr().c_str());

    cmd_buff[1] = RenameDirectoryBetweenArchives(src_archive_handle, src_dir_path,
                                                 dest_archive_handle, dest_dir_path)
                      .raw;
}

/**
 * FS_User::OpenDirectory service function
 *  Inputs:
 *      1 : Archive handle low word
 *      2 : Archive handle high word
 *      3 : Low path type
 *      4 : Low path size
 *      7 : (LowPathSize << 14) | 2
 *      8 : Low path data pointer
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 *      3 : Directory handle
 */
static void OpenDirectory(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    ArchiveHandle archive_handle = MakeArchiveHandle(cmd_buff[1], cmd_buff[2]);
    auto dirname_type = static_cast<FileSys::LowPathType>(cmd_buff[3]);
    u32 dirname_size = cmd_buff[4];
    u32 dirname_ptr = cmd_buff[6];

    FileSys::Path dir_path(dirname_type, dirname_size, dirname_ptr);

    LOG_DEBUG(Service_FS, "type=%u size=%u data=%s", static_cast<u32>(dirname_type), dirname_size,
              dir_path.DebugStr().c_str());

    ResultVal<std::shared_ptr<Directory>> dir_res =
        OpenDirectoryFromArchive(archive_handle, dir_path);
    cmd_buff[1] = dir_res.Code().raw;
    if (dir_res.Succeeded()) {
        std::shared_ptr<Directory> directory = *dir_res;
        auto sessions = ServerSession::CreateSessionPair(directory->GetName(), directory);
        directory->ClientConnected(std::get<Kernel::SharedPtr<Kernel::ServerSession>>(sessions));
        cmd_buff[3] = Kernel::g_handle_table
                          .Create(std::get<Kernel::SharedPtr<Kernel::ClientSession>>(sessions))
                          .MoveFrom();
    } else {
        LOG_ERROR(Service_FS, "failed to get a handle for directory type=%d size=%d data=%s",
                  dirname_type, dirname_size, dir_path.DebugStr().c_str());
    }
}

/**
 * FS_User::OpenArchive service function
 *  Inputs:
 *      1 : Archive ID
 *      2 : Archive low path type
 *      3 : Archive low path size
 *      4 : (LowPathSize << 14) | 2
 *      5 : Archive low path
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 *      2 : Archive handle lower word (unused)
 *      3 : Archive handle upper word (same as file handle)
 */
static void OpenArchive(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    auto archive_id = static_cast<FS::ArchiveIdCode>(cmd_buff[1]);
    auto archivename_type = static_cast<FileSys::LowPathType>(cmd_buff[2]);
    u32 archivename_size = cmd_buff[3];
    u32 archivename_ptr = cmd_buff[5];
    FileSys::Path archive_path(archivename_type, archivename_size, archivename_ptr);

    LOG_DEBUG(Service_FS, "archive_id=0x%08X archive_path=%s", static_cast<u32>(archive_id),
              archive_path.DebugStr().c_str());

    ResultVal<ArchiveHandle> handle = OpenArchive(archive_id, archive_path);
    cmd_buff[1] = handle.Code().raw;
    if (handle.Succeeded()) {
        cmd_buff[2] = *handle & 0xFFFFFFFF;
        cmd_buff[3] = (*handle >> 32) & 0xFFFFFFFF;
    } else {
        cmd_buff[2] = cmd_buff[3] = 0;
        LOG_ERROR(Service_FS,
                  "failed to get a handle for archive archive_id=0x%08X archive_path=%s",
                  static_cast<u32>(archive_id), archive_path.DebugStr().c_str());
    }
}

/**
 * FS_User::CloseArchive service function
 *  Inputs:
 *      0 : 0x080E0080
 *      1 : Archive handle low word
 *      2 : Archive handle high word
 *  Outputs:
 *      0 : ??? TODO(yuriks): Verify return header
 *      1 : Result of function, 0 on success, otherwise error code
 */
static void CloseArchive(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    ArchiveHandle archive_handle = MakeArchiveHandle(cmd_buff[1], cmd_buff[2]);
    cmd_buff[1] = CloseArchive(archive_handle).raw;
}

/*
* FS_User::IsSdmcDetected service function
*  Outputs:
*      1 : Result of function, 0 on success, otherwise error code
*      2 : Whether the Sdmc could be detected
*/
static void IsSdmcDetected(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    cmd_buff[1] = 0;
    cmd_buff[2] = Settings::values.use_virtual_sd ? 1 : 0;
}

/**
 * FS_User::IsSdmcWriteable service function
 *  Outputs:
 *      0 : Command header 0x08180000
 *      1 : Result of function, 0 on success, otherwise error code
 *      2 : Whether the Sdmc is currently writeable
 */
static void IsSdmcWriteable(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    cmd_buff[1] = RESULT_SUCCESS.raw;
    // If the SD isn't enabled, it can't be writeable...else, stubbed true
    cmd_buff[2] = Settings::values.use_virtual_sd ? 1 : 0;

    LOG_DEBUG(Service_FS, " (STUBBED)");
}

/**
 * FS_User::FormatSaveData service function,
 * formats the SaveData specified by the input path.
 *  Inputs:
 *      0  : 0x084C0242
 *      1  : Archive ID
 *      2  : Archive path type
 *      3  : Archive path size
 *      4  : Size in Blocks (1 block = 512 bytes)
 *      5  : Number of directories
 *      6  : Number of files
 *      7  : Directory bucket count
 *      8  : File bucket count
 *      9  : Duplicate data
 *      10 : (PathSize << 14) | 2
 *      11 : Archive low path
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 */
static void FormatSaveData(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();
    LOG_WARNING(Service_FS, "(STUBBED)");

    auto archive_id = static_cast<FS::ArchiveIdCode>(cmd_buff[1]);
    auto archivename_type = static_cast<FileSys::LowPathType>(cmd_buff[2]);
    u32 archivename_size = cmd_buff[3];
    u32 archivename_ptr = cmd_buff[11];
    FileSys::Path archive_path(archivename_type, archivename_size, archivename_ptr);

    LOG_DEBUG(Service_FS, "archive_path=%s", archive_path.DebugStr().c_str());

    if (archive_id != FS::ArchiveIdCode::SaveData) {
        LOG_ERROR(Service_FS, "tried to format an archive different than SaveData, %u",
                  static_cast<u32>(archive_id));
        cmd_buff[1] = ResultCode(ErrorDescription::FS_InvalidPath, ErrorModule::FS,
                                 ErrorSummary::InvalidArgument, ErrorLevel::Usage)
                          .raw;
        return;
    }

    if (archive_path.GetType() != FileSys::LowPathType::Empty) {
        // TODO(Subv): Implement formatting the SaveData of other games
        LOG_ERROR(Service_FS, "archive LowPath type other than empty is currently unsupported");
        cmd_buff[1] = UnimplementedFunction(ErrorModule::FS).raw;
        return;
    }

    FileSys::ArchiveFormatInfo format_info;
    format_info.duplicate_data = cmd_buff[9] & 0xFF;
    format_info.number_directories = cmd_buff[5];
    format_info.number_files = cmd_buff[6];
    format_info.total_size = cmd_buff[4] * 512;

    cmd_buff[1] = FormatArchive(ArchiveIdCode::SaveData, format_info).raw;
}

/**
 * FS_User::FormatThisUserSaveData service function
 *  Inputs:
 *      0: 0x080F0180
 *      1  : Size in Blocks (1 block = 512 bytes)
 *      2  : Number of directories
 *      3  : Number of files
 *      4  : Directory bucket count
 *      5  : File bucket count
 *      6  : Duplicate data
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 */
static void FormatThisUserSaveData(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    FileSys::ArchiveFormatInfo format_info;
    format_info.duplicate_data = cmd_buff[6] & 0xFF;
    format_info.number_directories = cmd_buff[2];
    format_info.number_files = cmd_buff[3];
    format_info.total_size = cmd_buff[1] * 512;

    cmd_buff[1] = FormatArchive(ArchiveIdCode::SaveData, format_info).raw;

    LOG_TRACE(Service_FS, "called");
}

/**
 * FS_User::GetFreeBytes service function
 *  Inputs:
 *      0: 0x08120080
 *      1: Archive handle low word
 *      2: Archive handle high word
 *  Outputs:
 *      1: Result of function, 0 on success, otherwise error code
 *      2: Free byte count low word
 *      3: Free byte count high word
 */
static void GetFreeBytes(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    ArchiveHandle archive_handle = MakeArchiveHandle(cmd_buff[1], cmd_buff[2]);
    ResultVal<u64> bytes_res = GetFreeBytesInArchive(archive_handle);

    cmd_buff[1] = bytes_res.Code().raw;
    if (bytes_res.Succeeded()) {
        cmd_buff[2] = (u32)*bytes_res;
        cmd_buff[3] = *bytes_res >> 32;
    } else {
        cmd_buff[2] = 0;
        cmd_buff[3] = 0;
    }
}

/**
 * FS_User::CreateExtSaveData service function
 *  Inputs:
 *      0 : 0x08510242
 *      1 : Media type (NAND / SDMC)
 *      2 : Low word of the saveid to create
 *      3 : High word of the saveid to create
 *      4 : Unknown
 *      5 : Number of directories
 *      6 : Number of files
 *      7-8 : Size limit
 *      9 : Size of the SMDH icon
 *      10: (SMDH Size << 4) | 0x0000000A
 *      11: Pointer to the SMDH icon for the new ExtSaveData
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 */
static void CreateExtSaveData(Service::Interface* self) {
    // TODO(Subv): Figure out the other parameters.
    u32* cmd_buff = Kernel::GetCommandBuffer();
    MediaType media_type = static_cast<MediaType>(cmd_buff[1] & 0xFF);
    u32 save_low = cmd_buff[2];
    u32 save_high = cmd_buff[3];
    u32 icon_size = cmd_buff[9];
    VAddr icon_buffer = cmd_buff[11];

    LOG_WARNING(
        Service_FS,
        "(STUBBED) savedata_high=%08X savedata_low=%08X cmd_buff[3]=%08X "
        "cmd_buff[4]=%08X cmd_buff[5]=%08X cmd_buff[6]=%08X cmd_buff[7]=%08X cmd_buff[8]=%08X "
        "icon_size=%08X icon_descriptor=%08X icon_buffer=%08X",
        save_high, save_low, cmd_buff[3], cmd_buff[4], cmd_buff[5], cmd_buff[6], cmd_buff[7],
        cmd_buff[8], icon_size, cmd_buff[10], icon_buffer);

    FileSys::ArchiveFormatInfo format_info;
    format_info.number_directories = cmd_buff[5];
    format_info.number_files = cmd_buff[6];
    format_info.duplicate_data = false;
    format_info.total_size = 0;
    cmd_buff[1] =
        CreateExtSaveData(media_type, save_high, save_low, icon_buffer, icon_size, format_info).raw;
}

/**
 * FS_User::DeleteExtSaveData service function
 *  Inputs:
 *      0 : 0x08520100
 *      1 : Media type (NAND / SDMC)
 *      2 : Low word of the saveid to create
 *      3 : High word of the saveid to create
 *      4 : Unknown
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 */
static void DeleteExtSaveData(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();
    MediaType media_type = static_cast<MediaType>(cmd_buff[1] & 0xFF);
    u32 save_low = cmd_buff[2];
    u32 save_high = cmd_buff[3];
    u32 unknown = cmd_buff[4]; // TODO(Subv): Figure out what this is

    LOG_WARNING(Service_FS, "(STUBBED) save_low=%08X save_high=%08X media_type=%08X unknown=%08X",
                save_low, save_high, cmd_buff[1] & 0xFF, unknown);

    cmd_buff[1] = DeleteExtSaveData(media_type, save_high, save_low).raw;
}

/**
 * FS_User::CardSlotIsInserted service function.
 *  Inputs:
 *      0 : 0x08210000
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 *      2 : Whether there is a game card inserted into the slot or not.
 */
static void CardSlotIsInserted(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();
    cmd_buff[1] = RESULT_SUCCESS.raw;
    cmd_buff[2] = 0;
    LOG_WARNING(Service_FS, "(STUBBED) called");
}

/**
 * FS_User::DeleteSystemSaveData service function.
 *  Inputs:
 *      0 : 0x08570080
 *      1 : High word of the SystemSaveData id to delete
 *      2 : Low word of the SystemSaveData id to delete
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 */
static void DeleteSystemSaveData(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();
    u32 savedata_high = cmd_buff[1];
    u32 savedata_low = cmd_buff[2];

    cmd_buff[1] = DeleteSystemSaveData(savedata_high, savedata_low).raw;
}

/**
 * FS_User::CreateSystemSaveData service function.
 *  Inputs:
 *      0 : 0x08560240
 *      1 : u8 MediaType of the system save data
 *      2 : SystemSaveData id to create
 *      3 : Total size
 *      4 : Block size
 *      5 : Number of directories
 *      6 : Number of files
 *      7 : Directory bucket count
 *      8 : File bucket count
 *      9 : u8 Whether to duplicate data or not
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 */
static void CreateSystemSaveData(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();
    u32 savedata_high = cmd_buff[1];
    u32 savedata_low = cmd_buff[2];

    LOG_WARNING(
        Service_FS,
        "(STUBBED) savedata_high=%08X savedata_low=%08X cmd_buff[3]=%08X "
        "cmd_buff[4]=%08X cmd_buff[5]=%08X cmd_buff[6]=%08X cmd_buff[7]=%08X cmd_buff[8]=%08X "
        "cmd_buff[9]=%08X",
        savedata_high, savedata_low, cmd_buff[3], cmd_buff[4], cmd_buff[5], cmd_buff[6],
        cmd_buff[7], cmd_buff[8], cmd_buff[9]);

    cmd_buff[1] = CreateSystemSaveData(savedata_high, savedata_low).raw;
}

/**
 * FS_User::CreateLegacySystemSaveData service function.
 *  This function appears to be obsolete and seems to have been replaced by
 *  command 0x08560240 (CreateSystemSaveData).
 *
 *  Inputs:
 *      0 : 0x08100200
 *      1 : SystemSaveData id to create
 *      2 : Total size
 *      3 : Block size
 *      4 : Number of directories
 *      5 : Number of files
 *      6 : Directory bucket count
 *      7 : File bucket count
 *      8 : u8 Duplicate data
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 */
static void CreateLegacySystemSaveData(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();
    u32 savedata_id = cmd_buff[1];

    LOG_WARNING(
        Service_FS,
        "(STUBBED) savedata_id=%08X cmd_buff[3]=%08X "
        "cmd_buff[4]=%08X cmd_buff[5]=%08X cmd_buff[6]=%08X cmd_buff[7]=%08X cmd_buff[8]=%08X "
        "cmd_buff[9]=%08X",
        savedata_id, cmd_buff[3], cmd_buff[4], cmd_buff[5], cmd_buff[6], cmd_buff[7], cmd_buff[8],
        cmd_buff[9]);

    cmd_buff[0] = IPC::MakeHeader(0x810, 0x1, 0);
    // With this command, the SystemSaveData always has save_high = 0 (Always created in the NAND)
    cmd_buff[1] = CreateSystemSaveData(0, savedata_id).raw;
}

/**
 * FS_User::InitializeWithSdkVersion service function.
 *  Inputs:
 *      0 : 0x08610042
 *      1 : Used SDK Version
 *      2 : ProcessId Header
 *      3 : placeholder for ProcessId
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 */
static void InitializeWithSdkVersion(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    const u32 version = cmd_buff[1];
    self->SetVersion(version);

    if (cmd_buff[2] == IPC::CallingPidDesc()) {
        LOG_WARNING(Service_FS, "(STUBBED) called, version: 0x%08X", version);
        cmd_buff[1] = RESULT_SUCCESS.raw;
    } else {
        LOG_ERROR(Service_FS, "ProcessId Header must be 0x20");
        cmd_buff[1] = ResultCode(ErrorDescription::OS_InvalidBufferDescriptor, ErrorModule::OS,
                                 ErrorSummary::WrongArgument, ErrorLevel::Permanent)
                          .raw;
    }
}

/**
 * FS_User::SetPriority service function.
 *  Inputs:
 *      0 : 0x08620040
 *      1 : priority
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 */
static void SetPriority(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    priority = cmd_buff[1];

    cmd_buff[1] = RESULT_SUCCESS.raw;

    LOG_DEBUG(Service_FS, "called priority=0x%X", priority);
}

/**
 * FS_User::GetPriority service function.
 *  Inputs:
 *      0 : 0x08630000
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 *      2 : priority
 */
static void GetPriority(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    if (priority == -1) {
        LOG_INFO(Service_FS, "priority was not set, priority=0x%X", priority);
    }

    cmd_buff[1] = RESULT_SUCCESS.raw;
    cmd_buff[2] = priority;

    LOG_DEBUG(Service_FS, "called priority=0x%X", priority);
}

/**
 * FS_User::GetArchiveResource service function.
 *  Inputs:
 *      0 : 0x08490040
 *      1 : Media type
 *  Outputs:
 *      1 : Result of function, 0 on success, otherwise error code
 *      2 : Sector byte-size
 *      3 : Cluster byte-size
 *      4 : Partition capacity in clusters
 *      5 : Available free space in clusters
 */
static void GetArchiveResource(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    LOG_WARNING(Service_FS, "(STUBBED) called Media type=0x%08X", cmd_buff[1]);

    cmd_buff[1] = RESULT_SUCCESS.raw;
    cmd_buff[2] = 512;
    cmd_buff[3] = 16384;
    cmd_buff[4] = 0x80000; // 8GiB capacity
    cmd_buff[5] = 0x80000; // 8GiB free
}

/**
 * FS_User::GetFormatInfo service function.
 *  Inputs:
 *      0 : 0x084500C2
 *      1 : Archive ID
 *      2 : Archive path type
 *      3 : Archive path size
 *      4 : (PathSize << 14) | 2
 *      5 : Archive low path
 *  Outputs:
 *      0 : 0x08450140
 *      1 : Result of function, 0 on success, otherwise error code
 *      2 : Total size
 *      3 : Number of directories
 *      4 : Number of files
 *      5 : Duplicate data
 */
static void GetFormatInfo(Service::Interface* self) {
    u32* cmd_buff = Kernel::GetCommandBuffer();

    auto archive_id = static_cast<FS::ArchiveIdCode>(cmd_buff[1]);
    auto archivename_type = static_cast<FileSys::LowPathType>(cmd_buff[2]);
    u32 archivename_size = cmd_buff[3];
    u32 archivename_ptr = cmd_buff[5];
    FileSys::Path archive_path(archivename_type, archivename_size, archivename_ptr);

    LOG_DEBUG(Service_FS, "archive_path=%s", archive_path.DebugStr().c_str());

    cmd_buff[0] = IPC::MakeHeader(0x0845, 5, 0);

    auto format_info = GetArchiveFormatInfo(archive_id, archive_path);

    if (format_info.Failed()) {
        LOG_ERROR(Service_FS, "Failed to retrieve the format info");
        cmd_buff[1] = format_info.Code().raw;
        return;
    }

    cmd_buff[1] = RESULT_SUCCESS.raw;
    cmd_buff[2] = format_info->total_size;
    cmd_buff[3] = format_info->number_directories;
    cmd_buff[4] = format_info->number_files;
    cmd_buff[5] = format_info->duplicate_data;
}

const Interface::FunctionInfo FunctionTable[] = {
    {0x000100C6, nullptr, "Dummy1"},
    {0x040100C4, nullptr, "Control"},
    {0x08010002, Initialize, "Initialize"},
    {0x080201C2, OpenFile, "OpenFile"},
    {0x08030204, OpenFileDirectly, "OpenFileDirectly"},
    {0x08040142, DeleteFile, "DeleteFile"},
    {0x08050244, RenameFile, "RenameFile"},
    {0x08060142, DeleteDirectory, "DeleteDirectory"},
    {0x08070142, DeleteDirectoryRecursively, "DeleteDirectoryRecursively"},
    {0x08080202, CreateFile, "CreateFile"},
    {0x08090182, CreateDirectory, "CreateDirectory"},
    {0x080A0244, RenameDirectory, "RenameDirectory"},
    {0x080B0102, OpenDirectory, "OpenDirectory"},
    {0x080C00C2, OpenArchive, "OpenArchive"},
    {0x080D0144, nullptr, "ControlArchive"},
    {0x080E0080, CloseArchive, "CloseArchive"},
    {0x080F0180, FormatThisUserSaveData, "FormatThisUserSaveData"},
    {0x08100200, CreateLegacySystemSaveData, "CreateLegacySystemSaveData"},
    {0x08110040, nullptr, "DeleteSystemSaveData"},
    {0x08120080, GetFreeBytes, "GetFreeBytes"},
    {0x08130000, nullptr, "GetCardType"},
    {0x08140000, nullptr, "GetSdmcArchiveResource"},
    {0x08150000, nullptr, "GetNandArchiveResource"},
    {0x08160000, nullptr, "GetSdmcFatfsError"},
    {0x08170000, IsSdmcDetected, "IsSdmcDetected"},
    {0x08180000, IsSdmcWriteable, "IsSdmcWritable"},
    {0x08190042, nullptr, "GetSdmcCid"},
    {0x081A0042, nullptr, "GetNandCid"},
    {0x081B0000, nullptr, "GetSdmcSpeedInfo"},
    {0x081C0000, nullptr, "GetNandSpeedInfo"},
    {0x081D0042, nullptr, "GetSdmcLog"},
    {0x081E0042, nullptr, "GetNandLog"},
    {0x081F0000, nullptr, "ClearSdmcLog"},
    {0x08200000, nullptr, "ClearNandLog"},
    {0x08210000, CardSlotIsInserted, "CardSlotIsInserted"},
    {0x08220000, nullptr, "CardSlotPowerOn"},
    {0x08230000, nullptr, "CardSlotPowerOff"},
    {0x08240000, nullptr, "CardSlotGetCardIFPowerStatus"},
    {0x08250040, nullptr, "CardNorDirectCommand"},
    {0x08260080, nullptr, "CardNorDirectCommandWithAddress"},
    {0x08270082, nullptr, "CardNorDirectRead"},
    {0x082800C2, nullptr, "CardNorDirectReadWithAddress"},
    {0x08290082, nullptr, "CardNorDirectWrite"},
    {0x082A00C2, nullptr, "CardNorDirectWriteWithAddress"},
    {0x082B00C2, nullptr, "CardNorDirectRead_4xIO"},
    {0x082C0082, nullptr, "CardNorDirectCpuWriteWithoutVerify"},
    {0x082D0040, nullptr, "CardNorDirectSectorEraseWithoutVerify"},
    {0x082E0040, nullptr, "GetProductInfo"},
    {0x082F0040, nullptr, "GetProgramLaunchInfo"},
    {0x08300182, nullptr, "CreateExtSaveData"},
    {0x08310180, nullptr, "CreateSharedExtSaveData"},
    {0x08320102, nullptr, "ReadExtSaveDataIcon"},
    {0x08330082, nullptr, "EnumerateExtSaveData"},
    {0x08340082, nullptr, "EnumerateSharedExtSaveData"},
    {0x08350080, nullptr, "DeleteExtSaveData"},
    {0x08360080, nullptr, "DeleteSharedExtSaveData"},
    {0x08370040, nullptr, "SetCardSpiBaudRate"},
    {0x08380040, nullptr, "SetCardSpiBusMode"},
    {0x08390000, nullptr, "SendInitializeInfoTo9"},
    {0x083A0100, nullptr, "GetSpecialContentIndex"},
    {0x083B00C2, nullptr, "GetLegacyRomHeader"},
    {0x083C00C2, nullptr, "GetLegacyBannerData"},
    {0x083D0100, nullptr, "CheckAuthorityToAccessExtSaveData"},
    {0x083E00C2, nullptr, "QueryTotalQuotaSize"},
    {0x083F00C0, nullptr, "GetExtDataBlockSize"},
    {0x08400040, nullptr, "AbnegateAccessRight"},
    {0x08410000, nullptr, "DeleteSdmcRoot"},
    {0x08420040, nullptr, "DeleteAllExtSaveDataOnNand"},
    {0x08430000, nullptr, "InitializeCtrFileSystem"},
    {0x08440000, nullptr, "CreateSeed"},
    {0x084500C2, GetFormatInfo, "GetFormatInfo"},
    {0x08460102, nullptr, "GetLegacyRomHeader2"},
    {0x08470180, nullptr, "FormatCtrCardUserSaveData"},
    {0x08480042, nullptr, "GetSdmcCtrRootPath"},
    {0x08490040, GetArchiveResource, "GetArchiveResource"},
    {0x084A0002, nullptr, "ExportIntegrityVerificationSeed"},
    {0x084B0002, nullptr, "ImportIntegrityVerificationSeed"},
    {0x084C0242, FormatSaveData, "FormatSaveData"},
    {0x084D0102, nullptr, "GetLegacySubBannerData"},
    {0x084E0342, nullptr, "UpdateSha256Context"},
    {0x084F0102, nullptr, "ReadSpecialFile"},
    {0x08500040, nullptr, "GetSpecialFileSize"},
    {0x08510242, CreateExtSaveData, "CreateExtSaveData"},
    {0x08520100, DeleteExtSaveData, "DeleteExtSaveData"},
    {0x08530142, nullptr, "ReadExtSaveDataIcon"},
    {0x085400C0, nullptr, "GetExtDataBlockSize"},
    {0x08550102, nullptr, "EnumerateExtSaveData"},
    {0x08560240, CreateSystemSaveData, "CreateSystemSaveData"},
    {0x08570080, DeleteSystemSaveData, "DeleteSystemSaveData"},
    {0x08580000, nullptr, "StartDeviceMoveAsSource"},
    {0x08590200, nullptr, "StartDeviceMoveAsDestination"},
    {0x085A00C0, nullptr, "SetArchivePriority"},
    {0x085B0080, nullptr, "GetArchivePriority"},
    {0x085C00C0, nullptr, "SetCtrCardLatencyParameter"},
    {0x085D01C0, nullptr, "SetFsCompatibilityInfo"},
    {0x085E0040, nullptr, "ResetCardCompatibilityParameter"},
    {0x085F0040, nullptr, "SwitchCleanupInvalidSaveData"},
    {0x08600042, nullptr, "EnumerateSystemSaveData"},
    {0x08610042, InitializeWithSdkVersion, "InitializeWithSdkVersion"},
    {0x08620040, SetPriority, "SetPriority"},
    {0x08630000, GetPriority, "GetPriority"},
    {0x08640000, nullptr, "GetNandInfo"},
    {0x08650140, nullptr, "SetSaveDataSecureValue"},
    {0x086600C0, nullptr, "GetSaveDataSecureValue"},
    {0x086700C4, nullptr, "ControlSecureSave"},
    {0x08680000, nullptr, "GetMediaType"},
    {0x08690000, nullptr, "GetNandEraseCount"},
    {0x086A0082, nullptr, "ReadNandReport"},
    {0x087A0180, nullptr, "AddSeed"},
    {0x088600C0, nullptr, "CheckUpdatedDat"},
};

////////////////////////////////////////////////////////////////////////////////////////////////////
// Interface class

Interface::Interface() {

    priority = -1;
    Register(FunctionTable);
}

} // namespace FS
} // namespace Service
