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

#pragma once

#include <memory>
#include <string>

#include "common/common_types.h"

#include "core/file_sys/archive_backend.h"
#include "core/hle/kernel/session.h"
#include "core/hle/result.h"

namespace FileSys {
class DirectoryBackend;
class FileBackend;
}

/// The unique system identifier hash, also known as ID0
extern const std::string SYSTEM_ID;
/// The scrambled SD card CID, also known as ID1
extern const std::string SDCARD_ID;

namespace Service {
namespace FS {

/// Supported archive types
enum class ArchiveIdCode : u32 {
    RomFS               = 0x00000003,
    SaveData            = 0x00000004,
    ExtSaveData         = 0x00000006,
    SharedExtSaveData   = 0x00000007,
    SystemSaveData      = 0x00000008,
    SDMC                = 0x00000009,
    SDMCWriteOnly       = 0x0000000A,
    SaveDataCheck       = 0x2345678A,
};

/// Media types for the archives
enum class MediaType : u32 {
    NAND     = 0,
    SDMC     = 1
};

typedef u64 ArchiveHandle;

class File : public Kernel::Session {
public:
    File(std::unique_ptr<FileSys::FileBackend>&& backend, const FileSys::Path& path);
    ~File();

    std::string GetName() const override { return "Path: " + path.DebugStr(); }
    ResultVal<bool> SyncRequest() override;

    FileSys::Path path; ///< Path of the file
    u32 priority; ///< Priority of the file. TODO(Subv): Find out what this means
    std::unique_ptr<FileSys::FileBackend> backend; ///< File backend interface
};

class Directory : public Kernel::Session {
public:
    Directory(std::unique_ptr<FileSys::DirectoryBackend>&& backend, const FileSys::Path& path);
    ~Directory();

    std::string GetName() const override { return "Directory: " + path.DebugStr(); }
    ResultVal<bool> SyncRequest() override;

    FileSys::Path path; ///< Path of the directory
    std::unique_ptr<FileSys::DirectoryBackend> backend; ///< File backend interface
};

/**
 * Opens an archive
 * @param id_code IdCode of the archive to open
 * @param archive_path Path to the archive, used with Binary paths
 * @return Handle to the opened archive
 */
ResultVal<ArchiveHandle> OpenArchive(ArchiveIdCode id_code, FileSys::Path& archive_path);

/**
 * Closes an archive
 * @param handle Handle to the archive to close
 */
ResultCode CloseArchive(ArchiveHandle handle);

/**
 * Registers an Archive type, instances of which can later be opened using its IdCode.
 * @param factory File system backend interface to the archive
 * @param id_code Id code used to access this type of archive
 */
ResultCode RegisterArchiveType(std::unique_ptr<FileSys::ArchiveFactory>&& factory, ArchiveIdCode id_code);

/**
 * Open a File from an Archive
 * @param archive_handle Handle to an open Archive object
 * @param path Path to the File inside of the Archive
 * @param mode Mode under which to open the File
 * @return The opened File object as a Session
 */
ResultVal<Kernel::SharedPtr<File>> OpenFileFromArchive(ArchiveHandle archive_handle,
        const FileSys::Path& path, const FileSys::Mode mode);

/**
 * Delete a File from an Archive
 * @param archive_handle Handle to an open Archive object
 * @param path Path to the File inside of the Archive
 * @return Whether deletion succeeded
 */
ResultCode DeleteFileFromArchive(ArchiveHandle archive_handle, const FileSys::Path& path);

/**
 * Rename a File between two Archives
 * @param src_archive_handle Handle to the source Archive object
 * @param src_path Path to the File inside of the source Archive
 * @param dest_archive_handle Handle to the destination Archive object
 * @param dest_path Path to the File inside of the destination Archive
 * @return Whether rename succeeded
 */
ResultCode RenameFileBetweenArchives(ArchiveHandle src_archive_handle, const FileSys::Path& src_path,
                                     ArchiveHandle dest_archive_handle, const FileSys::Path& dest_path);

/**
 * Delete a Directory from an Archive
 * @param archive_handle Handle to an open Archive object
 * @param path Path to the Directory inside of the Archive
 * @return Whether deletion succeeded
 */
ResultCode DeleteDirectoryFromArchive(ArchiveHandle archive_handle, const FileSys::Path& path);

/**
 * Create a File in an Archive
 * @param archive_handle Handle to an open Archive object
 * @param path Path to the File inside of the Archive
 * @param file_size The size of the new file, filled with zeroes
 * @return File creation result code
 */
ResultCode CreateFileInArchive(ArchiveHandle archive_handle, const FileSys::Path& path, u64 file_size);

/**
 * Create a Directory from an Archive
 * @param archive_handle Handle to an open Archive object
 * @param path Path to the Directory inside of the Archive
 * @return Whether creation of directory succeeded
 */
ResultCode CreateDirectoryFromArchive(ArchiveHandle archive_handle, const FileSys::Path& path);

/**
 * Rename a Directory between two Archives
 * @param src_archive_handle Handle to the source Archive object
 * @param src_path Path to the Directory inside of the source Archive
 * @param dest_archive_handle Handle to the destination Archive object
 * @param dest_path Path to the Directory inside of the destination Archive
 * @return Whether rename succeeded
 */
ResultCode RenameDirectoryBetweenArchives(ArchiveHandle src_archive_handle, const FileSys::Path& src_path,
                                          ArchiveHandle dest_archive_handle, const FileSys::Path& dest_path);

/**
 * Open a Directory from an Archive
 * @param archive_handle Handle to an open Archive object
 * @param path Path to the Directory inside of the Archive
 * @return The opened Directory object as a Session
 */
ResultVal<Kernel::SharedPtr<Directory>> OpenDirectoryFromArchive(ArchiveHandle archive_handle,
        const FileSys::Path& path);

/**
 * Get the free space in an Archive
 * @param archive_handle Handle to an open Archive object
 * @return The number of free bytes in the archive
 */
ResultVal<u64> GetFreeBytesInArchive(ArchiveHandle archive_handle);

/**
 * Erases the contents of the physical folder that contains the archive
 * identified by the specified id code and path
 * @param id_code The id of the archive to format
 * @param format_info Format information about the new archive
 * @param path The path to the archive, if relevant.
 * @return ResultCode 0 on success or the corresponding code on error
 */
ResultCode FormatArchive(ArchiveIdCode id_code, const FileSys::ArchiveFormatInfo& format_info, const FileSys::Path& path = FileSys::Path());

/**
 * Retrieves the format info about the archive of the specified type and path.
 * The format info is supplied by the client code when creating archives.
 * @param id_code The id of the archive
 * @param archive_path The path of the archive, if relevant
 * @return The format info of the archive, or the corresponding error code if failed.
 */
ResultVal<FileSys::ArchiveFormatInfo> GetArchiveFormatInfo(ArchiveIdCode id_code, FileSys::Path& archive_path);

/**
 * Creates a blank SharedExtSaveData archive for the specified extdata ID
 * @param media_type The media type of the archive to create (NAND / SDMC)
 * @param high The high word of the extdata id to create
 * @param low The low word of the extdata id to create
 * @param icon_buffer VAddr of the SMDH icon for this ExtSaveData
 * @param icon_size Size of the SMDH icon
 * @param format_info Format information about the new archive
 * @return ResultCode 0 on success or the corresponding code on error
 */
ResultCode CreateExtSaveData(MediaType media_type, u32 high, u32 low, VAddr icon_buffer, u32 icon_size, const FileSys::ArchiveFormatInfo& format_info);

/**
 * Deletes the SharedExtSaveData archive for the specified extdata ID
 * @param media_type The media type of the archive to delete (NAND / SDMC)
 * @param high The high word of the extdata id to delete
 * @param low The low word of the extdata id to delete
 * @return ResultCode 0 on success or the corresponding code on error
 */
ResultCode DeleteExtSaveData(MediaType media_type, u32 high, u32 low);

/**
 * Deletes the SystemSaveData archive folder for the specified save data id
 * @param high The high word of the SystemSaveData archive to delete
 * @param low The low word of the SystemSaveData archive to delete
 * @return ResultCode 0 on success or the corresponding code on error
 */
ResultCode DeleteSystemSaveData(u32 high, u32 low);

/**
 * Creates the SystemSaveData archive folder for the specified save data id
 * @param high The high word of the SystemSaveData archive to create
 * @param low The low word of the SystemSaveData archive to create
 * @return ResultCode 0 on success or the corresponding code on error
 */
ResultCode CreateSystemSaveData(u32 high, u32 low);

/// Initialize archives
void ArchiveInit();

/// Shutdown archives
void ArchiveShutdown();

} // namespace FS
} // namespace Service
