/**
 * @file ft.h File Transfer API
 * @ingroup core
 *
 * gaim
 *
 * Gaim 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifndef _GAIM_FT_H_
#define _GAIM_FT_H_

/**************************************************************************/
/** Data Structures                                                       */
/**************************************************************************/
typedef struct _GaimXfer GaimXfer;

#include "account.h"

/**
 * Types of file transfers.
 */
typedef enum
{
	GAIM_XFER_UNKNOWN = 0,  /**< Unknown file transfer type. */
	GAIM_XFER_SEND,         /**< File sending.               */
	GAIM_XFER_RECEIVE       /**< File receiving.             */

} GaimXferType;

/**
 * The different states of the xfer.
 */
typedef enum
{
	GAIM_XFER_STATUS_UNKNOWN = 0,   /**< Unknown, the xfer may be null. */
	GAIM_XFER_STATUS_NOT_STARTED,   /**< It hasn't started yet. */
	GAIM_XFER_STATUS_ACCEPTED,      /**< Receive accepted, but destination file not selected yet */
	GAIM_XFER_STATUS_STARTED,       /**< gaim_xfer_start has been called. */
	GAIM_XFER_STATUS_DONE,          /**< The xfer completed successfully. */
	GAIM_XFER_STATUS_CANCEL_LOCAL,  /**< The xfer was canceled by us. */
	GAIM_XFER_STATUS_CANCEL_REMOTE  /**< The xfer was canceled by the other end, or we couldn't connect. */
} GaimXferStatusType;

/**
 * File transfer UI operations.
 *
 * Any UI representing a file transfer must assign a filled-out
 * GaimXferUiOps structure to the gaim_xfer.
 */
typedef struct
{
	void (*new_xfer)(GaimXfer *xfer);
	void (*destroy)(GaimXfer *xfer);
	void (*add_xfer)(GaimXfer *xfer);
	void (*update_progress)(GaimXfer *xfer, double percent);
	void (*cancel_local)(GaimXfer *xfer);
	void (*cancel_remote)(GaimXfer *xfer);

} GaimXferUiOps;

/**
 * A core representation of a file transfer.
 */
struct _GaimXfer
{
	guint ref;                    /**< The reference count.                 */
	GaimXferType type;            /**< The type of transfer.               */

	GaimAccount *account;         /**< The account.                        */

	char *who;                    /**< The person on the other end of the
	                                   transfer.                           */

	char *filename;               /**< The name sent over the network.     */
	char *local_filename;         /**< The name on the local hard drive.   */
	size_t size;                  /**< The size of the file.               */

	FILE *dest_fp;                /**< The destination file pointer.       */

	char *remote_ip;              /**< The remote IP address.              */
	int local_port;               /**< The local port.                     */
	int remote_port;              /**< The remote port.                    */

	int fd;                       /**< The socket file descriptor.         */
	int watcher;                  /**< Watcher.                            */

	size_t bytes_sent;            /**< The number of bytes sent.           */
	size_t bytes_remaining;       /**< The number of bytes remaining.      */

	GaimXferStatusType status;    /**< File Transfer's status.             */

	/* I/O operations. */
	struct
	{
		void (*init)(GaimXfer *xfer);
		void (*request_denied)(GaimXfer *xfer);
		void (*start)(GaimXfer *xfer);
		void (*end)(GaimXfer *xfer);
		void (*cancel_send)(GaimXfer *xfer);
		void (*cancel_recv)(GaimXfer *xfer);
		ssize_t (*read)(char **buffer, GaimXfer *xfer);
		ssize_t (*write)(const char *buffer, size_t size, GaimXfer *xfer);
		void (*ack)(GaimXfer *xfer, const char *buffer, size_t size);

	} ops;

	GaimXferUiOps *ui_ops;            /**< UI-specific operations. */
	void *ui_data;                    /**< UI-specific data.       */

	void *data;                       /**< prpl-specific data.     */
};

#ifdef __cplusplus
extern "C" {
#endif

/**************************************************************************/
/** @name File Transfer API                                               */
/**************************************************************************/
/*@{*/

/**
 * Creates a new file transfer handle.
 * This is called by prpls.
 * The handle starts with a ref count of 1, and this reference
 * is owned by the core. The prpl normally does not need to
 * gaim_xfer_ref or unref.
 *
 * @param account The account sending or receiving the file.
 * @param type    The type of file transfer.
 * @param who     The name of the remote user.
 *
 * @return A file transfer handle.
 */
GaimXfer *gaim_xfer_new(GaimAccount *account,
								GaimXferType type, const char *who);

/**
 * Increases the reference count on a GaimXfer.
 * Please call gaim_xfer_unref later.
 *
 * @param xfer A file transfer handle.
 */
void gaim_xfer_ref(GaimXfer *xfer);

/**
 * Decreases the reference count on a GaimXfer.
 * If the reference reaches 0, gaim_xfer_destroy (an internal function)
 * will destroy the xfer. It calls the ui destroy cb first.
 * Since the core keeps a ref on the xfer, only an erroneous call to
 * this function will destroy the xfer while still in use.
 *
 * @param xfer A file transfer handle.
 */
void gaim_xfer_unref(GaimXfer *xfer);

/**
 * Requests confirmation for a file transfer from the user. If receiving
 * a file which is known at this point, this requests user to accept and
 * save the file. If the filename is unknown (not set) this only requests user
 * to accept the file transfer. In this case protocol must call this function
 * again once the filename is available.
 *
 * @param xfer The file transfer to request confirmation on.
 */
void gaim_xfer_request(GaimXfer *xfer);

/**
 * Called if the user accepts the file transfer request.
 *
 * @param xfer     The file transfer.
 * @param filename The filename.
 */
void gaim_xfer_request_accepted(GaimXfer *xfer, const char *filename);

/**
 * Called if the user rejects the file transfer request.
 *
 * @param xfer The file transfer.
 */
void gaim_xfer_request_denied(GaimXfer *xfer);

/**
 * Returns the type of file transfer.
 *
 * @param xfer The file transfer.
 *
 * @return The type of the file transfer.
 */
GaimXferType gaim_xfer_get_type(const GaimXfer *xfer);

/**
 * Returns the account the file transfer is using.
 *
 * @param xfer The file transfer.
 *
 * @return The account.
 */
GaimAccount *gaim_xfer_get_account(const GaimXfer *xfer);

/**
 * Returns the status of the xfer.
 *
 * @param xfer The file transfer.
 *
 * @return The status.
 */
GaimXferStatusType gaim_xfer_get_status(const GaimXfer *xfer);

/**
 * Returns true if the file transfer was canceled.
 *
 * @param xfer The file transfer.
 *
 * @return Whether or not the transfer was canceled.
 */
gboolean gaim_xfer_is_canceled(const GaimXfer *xfer);

/**
 * Returns the completed state for a file transfer.
 *
 * @param xfer The file transfer.
 *
 * @return The completed state.
 */
gboolean gaim_xfer_is_completed(const GaimXfer *xfer);

/**
 * Returns the name of the file being sent or received.
 *
 * @param xfer The file transfer.
 *
 * @return The filename.
 */
const char *gaim_xfer_get_filename(const GaimXfer *xfer);

/**
 * Returns the file's destination filename,
 *
 * @param xfer The file transfer.
 *
 * @return The destination filename.
 */
const char *gaim_xfer_get_local_filename(const GaimXfer *xfer);

/**
 * Returns the number of bytes sent so far.
 *
 * @param xfer The file transfer.
 *
 * @return The number of bytes sent.
 */
size_t gaim_xfer_get_bytes_sent(const GaimXfer *xfer);

/**
 * Returns the number of bytes received so far.
 *
 * @param xfer The file transfer.
 *
 * @return The number of bytes received.
 */
size_t gaim_xfer_get_bytes_remaining(const GaimXfer *xfer);

/**
 * Returns the size of the file being sent or received.
 *
 * @param xfer The file transfer.
 *
 * @return The total size of the file.
 */
size_t gaim_xfer_get_size(const GaimXfer *xfer);

/**
 * Returns the current percentage of progress of the transfer.
 *
 * This is a number between 0 (0%) and 1 (100%).
 *
 * @param xfer The file transfer.
 *
 * @return The percentage complete.
 */
double gaim_xfer_get_progress(const GaimXfer *xfer);

/**
 * Returns the local port number in the file transfer.
 *
 * @param xfer The file transfer.
 *
 * @return The port number on this end.
 */
unsigned int gaim_xfer_get_local_port(const GaimXfer *xfer);

/**
 * Returns the remote IP address in the file transfer.
 *
 * @param xfer The file transfer.
 *
 * @return The IP address on the other end.
 */
const char *gaim_xfer_get_remote_ip(const GaimXfer *xfer);

/**
 * Returns the remote port number in the file transfer.
 *
 * @param xfer The file transfer.
 *
 * @return The port number on the other end.
 */
unsigned int gaim_xfer_get_remote_port(const GaimXfer *xfer);

/**
 * Sets the completed state for the file transfer.
 *
 * @param xfer      The file transfer.
 * @param completed The completed state.
 */
void gaim_xfer_set_completed(GaimXfer *xfer, gboolean completed);

/**
 * Sets the filename for the file transfer.
 *
 * @param xfer     The file transfer.
 * @param filename The filename.
 */
void gaim_xfer_set_filename(GaimXfer *xfer, const char *filename);

/**
 * Sets the local filename for the file transfer.
 *
 * @param xfer     The file transfer.
 * @param filename The filename
 */
void gaim_xfer_set_local_filename(GaimXfer *xfer, const char *filename);

/**
 * Sets the size of the file in a file transfer.
 *
 * @param xfer The file transfer.
 * @param size The size of the file.
 */
void gaim_xfer_set_size(GaimXfer *xfer, size_t size);

/**
 * Returns the UI operations structure for a file transfer.
 *
 * @param xfer The file transfer.
 *
 * @return The UI operations structure.
 */
GaimXferUiOps *gaim_xfer_get_ui_ops(const GaimXfer *xfer);

/**
 * Sets the read function for the file transfer.
 *
 * @param xfer The file transfer.
 * @param fnc  The read function.
 */
void gaim_xfer_set_read_fnc(GaimXfer *xfer,
		ssize_t (*fnc)(char **, GaimXfer *));

/**
 * Sets the write function for the file transfer.
 *
 * @param xfer The file transfer.
 * @param fnc  The write function.
 */
void gaim_xfer_set_write_fnc(GaimXfer *xfer,
		ssize_t (*fnc)(const char *, size_t, GaimXfer *));

/**
 * Sets the acknowledge function for the file transfer.
 *
 * @param xfer The file transfer.
 * @param fnc  The acknowledge function.
 */
void gaim_xfer_set_ack_fnc(GaimXfer *xfer,
		void (*fnc)(GaimXfer *, const char *, size_t));

/**
 * Sets the function to be called if the request is denied.
 *
 * @param xfer The file transfer.
 * @param fnc The request denied prpl callback.
 */
void gaim_xfer_set_request_denied_fnc(GaimXfer *xfer, void (*fnc)(GaimXfer *));

/**
 * Sets the transfer initialization function for the file transfer.
 *
 * This function is required, and must call gaim_xfer_start() with
 * the necessary parameters. This will be called if the file transfer
 * is accepted by the user.
 *
 * @param xfer The file transfer.
 * @param fnc  The transfer initialization function.
 */
void gaim_xfer_set_init_fnc(GaimXfer *xfer, void (*fnc)(GaimXfer *));

/**
 * Sets the start transfer function for the file transfer.
 *
 * @param xfer The file transfer.
 * @param fnc  The start transfer function.
 */
void gaim_xfer_set_start_fnc(GaimXfer *xfer, void (*fnc)(GaimXfer *));

/**
 * Sets the end transfer function for the file transfer.
 *
 * @param xfer The file transfer.
 * @param fnc  The end transfer function.
 */
void gaim_xfer_set_end_fnc(GaimXfer *xfer, void (*fnc)(GaimXfer *));

/**
 * Sets the cancel send function for the file transfer.
 *
 * @param xfer The file transfer.
 * @param fnc  The cancel send function.
 */
void gaim_xfer_set_cancel_send_fnc(GaimXfer *xfer, void (*fnc)(GaimXfer *));

/**
 * Sets the cancel receive function for the file transfer.
 *
 * @param xfer The file transfer.
 * @param fnc  The cancel receive function.
 */
void gaim_xfer_set_cancel_recv_fnc(GaimXfer *xfer, void (*fnc)(GaimXfer *));

/**
 * Reads in data from a file transfer stream.
 *
 * @param xfer   The file transfer.
 * @param buffer The buffer that will be created to contain the data.
 *
 * @return The number of bytes read, or -1.
 */
ssize_t gaim_xfer_read(GaimXfer *xfer, char **buffer);

/**
 * Writes data to a file transfer stream.
 *
 * @param xfer   The file transfer.
 * @param buffer The buffer to read the data from.
 * @param size   The number of bytes to write.
 *
 * @return The number of bytes written, or -1.
 */
ssize_t gaim_xfer_write(GaimXfer *xfer, const char *buffer, size_t size);

/**
 * Starts a file transfer.
 *
 * Either @a fd must be specified <i>or</i> @a ip and @a port on a
 * file receive transfer. On send, @a fd must be specified, and
 * @a ip and @a port are ignored.
 *
 * @param xfer The file transfer.
 * @param fd   The file descriptor for the socket.
 * @param ip   The IP address to connect to.
 * @param port The port to connect to.
 */
void gaim_xfer_start(GaimXfer *xfer, int fd, const char *ip,
					 unsigned int port);

/**
 * Ends a file transfer.
 *
 * @param xfer The file transfer.
 */
void gaim_xfer_end(GaimXfer *xfer);

/**
 * Adds a new file transfer to the list of file transfers. Call this only
 * if you are not using gaim_xfer_start.
 *
 * @param xfer The file transfer.
 */
void gaim_xfer_add(GaimXfer *xfer);

/**
 * Cancels a file transfer on the local end.
 *
 * @param xfer The file transfer.
 */
void gaim_xfer_cancel_local(GaimXfer *xfer);

/**
 * Cancels a file transfer from the remote end.
 *
 * @param xfer The file transfer.
 */
void gaim_xfer_cancel_remote(GaimXfer *xfer);

/**
 * Displays a file transfer-related error message.
 *
 * This is a wrapper around gaim_notify_error(), which automatically
 * specifies a title ("File transfer to <i>user</i> aborted" or
 * "File Transfer from <i>user</i> aborted").
 *
 * @param type The type of file transfer.
 * @param who  The user on the other end of the transfer.
 * @param msg  The message to display.
 */
void gaim_xfer_error(GaimXferType type, const char *who, const char *msg);

/**
 * Updates file transfer progress.
 *
 * @param xfer      The file transfer.
 */
void gaim_xfer_update_progress(GaimXfer *xfer);

/*@}*/

/**************************************************************************/
/** @name UI Registration Functions                                       */
/**************************************************************************/
/*@{*/

/**
 * Sets the UI operations structure to be used in all gaim file transfers.
 *
 * @param ops The UI operations structure.
 */
void gaim_xfers_set_ui_ops(GaimXferUiOps *ops);

/**
 * Returns the UI operations structure to be used in all gaim file transfers.
 *
 * @return The UI operations structure.
 */
GaimXferUiOps *gaim_xfers_get_ui_ops(void);

/*@}*/

#ifdef __cplusplus
}
#endif

#endif /* _GAIM_FT_H_ */