/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/

#ifndef CLOUD_CLOUDMANAGER_H
#define CLOUD_CLOUDMANAGER_H

#include "backends/cloud/storage.h"
#include "common/array.h"
#include "common/singleton.h"
#include "common/str-array.h"

namespace GUI {

class CommandReceiver;

}

namespace Cloud {

// The actual indexes in CloudManager's array
enum StorageID {
	kStorageNoneId = 0,
	kStorageDropboxId = 1,
	kStorageOneDriveId = 2,
	kStorageGoogleDriveId = 3,

	kStorageTotal
};

class CloudManager : public Common::Singleton<CloudManager> {
	static const char *const kStoragePrefix;

	struct StorageConfig {
		Common::String name, username;
		uint64 usedBytes;
		Common::String lastSyncDate;
	};

	Common::Array<StorageConfig> _storages;
	uint _currentStorageIndex;
	Storage *_activeStorage;

	void printBool(Cloud::Storage::BoolResponse response) const;

	void loadStorage();

	Common::String getStorageConfigName(uint32 index) const;

public:
	CloudManager();
	virtual ~CloudManager();

	/**
	 * Loads all information from configs and creates current Storage instance.
	 *
	 * @note It's called once on startup in scummvm_main().
	 */
	void init();

	/**
	 * Saves all information into configuration file.
	 */
	void save();

	/**
	 * Replace active Storage.
	 * @note this method automatically saves the changes with ConfMan.
	 *
	 * @param	storage Cloud::Storage to replace active storage with.
	 * @param	index   one of Cloud::StorageID enum values to indicate what storage type is replaced.	 
	 */
	void replaceStorage(Storage *storage, uint32 index);

	/**
	 * Returns active Storage, which could be used to interact
	 *  with cloud storage.
	 *
	 * @return	active Cloud::Storage or null, if there is no active Storage.
	 */
	Cloud::Storage *getCurrentStorage() const;

	/**
	 * Return active Storage's index.
	 *
	 * @return	active Storage's index.
	 */
	uint32 getStorageIndex() const;

	/**
	 * Return Storages names as list.
	 *
	 * @return	a list of Storages names.
	 */
	Common::StringArray listStorages() const;

	/**
	 * Changes the storage to the one with given index.
	 *
	 * @param	new Storage's index.
	 */
	bool switchStorage(uint32 index);

	/**
	 * Return username used by Storage.
	 *
	 * @param	Storage's index.
	 * @returns	username or "" if index is invalid (no such Storage).
	 */
	Common::String getStorageUsername(uint32 index);

	/**
	 * Return space used by Storage.
	 *
	 * @param	Storage's index.
	 * @returns	used space in bytes or 0 if index is invalid (no such Storage).
	 */
	uint64 getStorageUsedSpace(uint32 index);

	/**
	 * Return Storage's last sync date.
	 *
	 * @param	Storage's index.
	 * @returns	last sync date or "" if index is invalid (no such Storage).
				It also returns "" if there never was any sync
				or if storage is syncing right now.
	 */
	Common::String getStorageLastSync(uint32 index);

	/**
	 * Set Storage's username.
	 * Automatically saves changes to the config.
	 *
	 * @param	index	Storage's index.
	 * @param	name	username to set
	 */
	void setStorageUsername(uint32 index, Common::String name);

	/**	
	 * Set Storage's used space field.
	 * Automatically saves changes to the config.
	 *
	 * @param	index	Storage's index.
	 * @param	used	value to set
	 */
	void setStorageUsedSpace(uint32 index, uint64 used);

	/**
	 * Set Storage's last sync date.
	 * Automatically saves changes to the config.
	 *
	 * @param	index	Storage's index.
	 * @param	date	date to set
	 */
	void setStorageLastSync(uint32 index, Common::String date);

	/**
	 * Replace Storage which has given index with a
	 * storage created with given code.
	 *
	 * @param	index	Storage's index
	 * @param	code	OAuth2 code received from user
	 */
	void connectStorage(uint32 index, Common::String code);

	/** Returns ListDirectoryResponse with list of files. */
	Networking::Request *listDirectory(Common::String path, Storage::ListDirectoryCallback callback, Networking::ErrorCallback errorCallback, bool recursive = false);

	/** Returns Common::Array<StorageFile> with list of files, which were not downloaded. */
	Networking::Request *downloadFolder(Common::String remotePath, Common::String localPath, Storage::FileArrayCallback callback, Networking::ErrorCallback errorCallback, bool recursive = false);

	/** Return the StorageInfo struct. */
	Networking::Request *info(Storage::StorageInfoCallback callback, Networking::ErrorCallback errorCallback);

	/** Returns storage's saves directory path with the trailing slash. */
	Common::String savesDirectoryPath();

	/**
	 * Starts saves syncing process in currently active storage if there is any.
	 */
	SavesSyncRequest *syncSaves(Cloud::Storage::BoolCallback callback = nullptr, Networking::ErrorCallback errorCallback = nullptr);

	/**
	 * Starts feature testing (the one I'm working on currently). (Temporary)
	 */
	void testFeature();

	/** Returns whether there are any requests running. */
	bool isWorking();

	///// SavesSyncRequest-related /////

	/** Returns whether there is a SavesSyncRequest running. */
	bool isSyncing();

	/** Returns a number in [0, 1] range which represents current sync downloading progress (1 = complete). */
	double getSyncDownloadingProgress();

	/** Returns a number in [0, 1] range which represents current sync progress (1 = complete). */
	double getSyncProgress();

	/** Returns an array of saves names which are not yet synced (thus cannot be used). */
	Common::Array<Common::String> getSyncingFiles();

	/** Cancels running sync. */
	void cancelSync();

	/** Sets SavesSyncRequest's target to given CommandReceiver. */
	void setSyncTarget(GUI::CommandReceiver *target);

	///// DownloadFolderRequest-related /////

	/** Starts a folder download. */
	bool startDownload(Common::String remotePath, Common::String localPath);

	/** Cancels running download. */
	void cancelDownload();

	/** Sets FolderDownloadRequest's target to given CommandReceiver. */
	void setDownloadTarget(GUI::CommandReceiver *target);

	/** Returns whether there is a FolderDownloadRequest running. */
	bool isDownloading();

	/** Returns a number in [0, 1] range which represents current download progress (1 = complete). */
	double getDownloadingProgress();

	/** Returns remote directory path. */
	virtual Common::String getDownloadRemoteDirectory();

	/** Returns local directory path. */
	virtual Common::String getDownloadLocalDirectory();
};

/** Shortcut for accessing the connection manager. */
#define CloudMan		Cloud::CloudManager::instance()

} // End of namespace Cloud

#endif