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+/* 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 "backends/cloud/cloudicon.h"
+
+#include "common/array.h"
+#include "common/singleton.h"
+#include "common/str-array.h"
+#include "common/events.h"
+
+namespace GUI {
+
+class CommandReceiver;
+
+}
+
+namespace Cloud {
+
+// The actual indexes in CloudManager's array
+enum StorageID {
+	kStorageNoneId = 0,
+	kStorageDropboxId = 1,
+	kStorageOneDriveId = 2,
+	kStorageGoogleDriveId = 3,
+	kStorageBoxId = 4,
+
+	kStorageTotal
+};
+
+class CloudManager : public Common::Singleton<CloudManager>, public Common::EventSource {
+	static const char *const kStoragePrefix;
+
+	struct StorageConfig {
+		Common::String name, username;
+		uint64 usedBytes;
+		Common::String lastSyncDate;
+	};
+
+	Common::Array<StorageConfig> _storages;
+	uint _currentStorageIndex;
+	Storage *_activeStorage;
+	Common::Array<Storage *> _storagesToRemove;
+
+	CloudIcon _icon;
+
+	void loadStorage();
+
+	Common::String getStorageConfigName(uint32 index) const;
+
+	/** Frees memory used by storages which failed to connect. */
+	void freeStorages();
+
+	/** Calls the error callback with a special "no storage connected" message. */
+	void passNoStorageConnected(Networking::ErrorCallback errorCallback) const;
+
+	/**
+	 * Common::EventSource interface
+	 *
+	 * The cloud manager registers itself as an event source even if does not
+	 * actually produce events as a mean to be polled periodically by the GUI
+	 * or engine code.
+	 *
+	 * The periodical polling is used to update the OSD icon indicating
+	 * background sync activity.
+	 */
+	virtual bool pollEvent(Common::Event &event) override;
+
+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);
+
+	/** Adds storage in the list of storages to remove later. */
+	void removeStorage(Storage *storage);
+
+	/**
+	 * 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);
+
+	/** Returns whether there are any requests running. */
+	bool isWorking() const;
+
+	/** Returns whether LocalWebserver is available to use for auth. */
+	static bool couldUseLocalServer();
+
+	///// SavesSyncRequest-related /////
+
+	/** Returns whether there is a SavesSyncRequest running. */
+	bool isSyncing() const;
+
+	/** Returns a number in [0, 1] range which represents current sync downloading progress (1 = complete). */
+	double getSyncDownloadingProgress() const;
+
+	/** Returns a number in [0, 1] range which represents current sync progress (1 = complete). */
+	double getSyncProgress() const;
+
+	/** Returns an array of saves names which are not yet synced (thus cannot be used). */
+	Common::Array<Common::String> getSyncingFiles() const;
+
+	/** Cancels running sync. */
+	void cancelSync() const;
+
+	/** Sets SavesSyncRequest's target to given CommandReceiver. */
+	void setSyncTarget(GUI::CommandReceiver *target) const;
+
+	/** Shows a "cloud disabled" icon for three seconds. */
+	void showCloudDisabledIcon();
+
+	///// DownloadFolderRequest-related /////
+
+	/** Starts a folder download. */
+	bool startDownload(Common::String remotePath, Common::String localPath) const;
+
+	/** Cancels running download. */
+	void cancelDownload() const;
+
+	/** Sets FolderDownloadRequest's target to given CommandReceiver. */
+	void setDownloadTarget(GUI::CommandReceiver *target) const;
+
+	/** Returns whether there is a FolderDownloadRequest running. */
+	bool isDownloading() const;
+
+	/** Returns a number in [0, 1] range which represents current download progress (1 = complete). */
+	double getDownloadingProgress() const;
+
+	/** Returns a number of bytes that is downloaded in current download progress. */
+	uint64 getDownloadBytesNumber() const;
+
+	/** Returns a total number of bytes to be downloaded in current download progress. */
+	uint64 getDownloadTotalBytesNumber() const;
+
+	/** Returns download speed of current download progress. */
+	uint64 getDownloadSpeed() const;
+
+	/** Returns remote directory path. */
+	Common::String getDownloadRemoteDirectory() const;
+
+	/** Returns local directory path. */
+	Common::String getDownloadLocalDirectory() const;
+};
+
+/** Shortcut for accessing the connection manager. */
+#define CloudMan        Cloud::CloudManager::instance()
+
+} // End of namespace Cloud
+
+#endif