/**
 * @file libimobiledevice/libimobiledevice.h
 * @brief Device/Connection handling and communication
 * \internal
 *
 * Copyright (c) 2010-2014 Martin Szulecki All Rights Reserved.
 * Copyright (c) 2014 Christophe Fergeau All Rights Reserved.
 * Copyright (c) 2008 Jonathan Beck All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef IMOBILEDEVICE_H
#define IMOBILEDEVICE_H

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <plist/plist.h>

/** Error Codes */
typedef enum {
	IDEVICE_E_SUCCESS         =  0,
	IDEVICE_E_INVALID_ARG     = -1,
	IDEVICE_E_UNKNOWN_ERROR   = -2,
	IDEVICE_E_NO_DEVICE       = -3,
	IDEVICE_E_NOT_ENOUGH_DATA = -4,
	IDEVICE_E_BAD_HEADER      = -5,
	IDEVICE_E_SSL_ERROR       = -6
} idevice_error_t;

typedef struct idevice_private idevice_private;
typedef idevice_private *idevice_t; /**< The device handle. */

typedef struct idevice_connection_private idevice_connection_private;
typedef idevice_connection_private *idevice_connection_t; /**< The connection handle. */

/* discovery (events/asynchronous) */
/** The event type for device add or removal */
enum idevice_event_type {
	IDEVICE_DEVICE_ADD = 1,
	IDEVICE_DEVICE_REMOVE
};

/* event data structure */
/** Provides information about the occured event. */
typedef struct {
	enum idevice_event_type event; /**< The event type. */
	const char *udid; /**< The device unique id. */
	int conn_type; /**< The connection type. Currently only 1 for usbmuxd. */
} idevice_event_t;

/* event callback function prototype */
/** Callback to notifiy if a device was added or removed. */
typedef void (*idevice_event_cb_t) (const idevice_event_t *event, void *user_data);

/* functions */

/**
 * Set the level of debugging.
 *
 * @param level Set to 0 for no debug output or 1 to enable debug output.
 */
void idevice_set_debug_level(int level);

/**
 * Register a callback function that will be called when device add/remove
 * events occur.
 *
 * @param callback Callback function to call.
 * @param user_data Application-specific data passed as parameter
 *   to the registered callback function.
 *
 * @return IDEVICE_E_SUCCESS on success or an error value when an error occured.
 */
idevice_error_t idevice_event_subscribe(idevice_event_cb_t callback, void *user_data);

/**
 * Release the event callback function that has been registered with
 *  idevice_event_subscribe().
 *
 * @return IDEVICE_E_SUCCESS on success or an error value when an error occured.
 */
idevice_error_t idevice_event_unsubscribe(void);

/* discovery (synchronous) */

/**
 * Get a list of currently available devices.
 *
 * @param devices List of udids of devices that are currently available.
 *   This list is terminated by a NULL pointer.
 * @param count Number of devices found.
 *
 * @return IDEVICE_E_SUCCESS on success or an error value when an error occured.
 */
idevice_error_t idevice_get_device_list(char ***devices, int *count);

/**
 * Free a list of device udids.
 *
 * @param devices List of udids to free.
 *
 * @return Always returnes IDEVICE_E_SUCCESS.
 */
idevice_error_t idevice_device_list_free(char **devices);

/* device structure creation and destruction */

/**
 * Creates an idevice_t structure for the device specified by udid,
 *  if the device is available.
 *
 * @note The resulting idevice_t structure has to be freed with
 * idevice_free() if it is no longer used.
 *
 * @param device Upon calling this function, a pointer to a location of type
 *  idevice_t. On successful return, this location will be populated.
 * @param udid The UDID to match.
 *
 * @return IDEVICE_E_SUCCESS if ok, otherwise an error code.
 */
idevice_error_t idevice_new(idevice_t *device, const char *udid);

/**
 * Cleans up an idevice structure, then frees the structure itself.
 * This is a library-level function; deals directly with the device to tear
 *  down relations, but otherwise is mostly internal.
 *
 * @param device idevice_t to free.
 */
idevice_error_t idevice_free(idevice_t device);

/* connection/disconnection */

/**
 * Set up a connection to the given device.
 *
 * @param device The device to connect to.
 * @param port The destination port to connect to.
 * @param connection Pointer to an idevice_connection_t that will be filled
 *   with the necessary data of the connection.
 *
 * @return IDEVICE_E_SUCCESS if ok, otherwise an error code.
 */
idevice_error_t idevice_connect(idevice_t device, uint16_t port, idevice_connection_t *connection);

/**
 * Disconnect from the device and clean up the connection structure.
 *
 * @param connection The connection to close.
 *
 * @return IDEVICE_E_SUCCESS if ok, otherwise an error code.
 */
idevice_error_t idevice_disconnect(idevice_connection_t connection);

/* communication */

/**
 * Send data to a device via the given connection.
 *
 * @param connection The connection to send data over.
 * @param data Buffer with data to send.
 * @param len Size of the buffer to send.
 * @param sent_bytes Pointer to an uint32_t that will be filled
 *   with the number of bytes actually sent.
 *
 * @return IDEVICE_E_SUCCESS if ok, otherwise an error code.
 */
idevice_error_t idevice_connection_send(idevice_connection_t connection, const char *data, uint32_t len, uint32_t *sent_bytes);

/**
 * Receive data from a device via the given connection.
 * This function will return after the given timeout even if no data has been
 * received.
 *
 * @param connection The connection to receive data from.
 * @param data Buffer that will be filled with the received data.
 *   This buffer has to be large enough to hold len bytes.
 * @param len Buffer size or number of bytes to receive.
 * @param recv_bytes Number of bytes actually received.
 * @param timeout Timeout in milliseconds after which this function should
 *   return even if no data has been received.
 *
 * @return IDEVICE_E_SUCCESS if ok, otherwise an error code.
 */
idevice_error_t idevice_connection_receive_timeout(idevice_connection_t connection, char *data, uint32_t len, uint32_t *recv_bytes, unsigned int timeout);

/**
 * Receive data from a device via the given connection.
 * This function is like idevice_connection_receive_timeout, but with a
 * predefined reasonable timeout.
 *
 * @param connection The connection to receive data from.
 * @param data Buffer that will be filled with the received data.
 *   This buffer has to be large enough to hold len bytes.
 * @param len Buffer size or number of bytes to receive.
 * @param recv_bytes Number of bytes actually received.
 *
 * @return IDEVICE_E_SUCCESS if ok, otherwise an error code.
 */
idevice_error_t idevice_connection_receive(idevice_connection_t connection, char *data, uint32_t len, uint32_t *recv_bytes);

/**
 * Enables SSL for the given connection.
 *
 * @param connection The connection to enable SSL for.
 *
 * @return IDEVICE_E_SUCCESS on success, IDEVICE_E_INVALID_ARG when connection
 *     is NULL or connection->ssl_data is non-NULL, or IDEVICE_E_SSL_ERROR when
 *     SSL initialization, setup, or handshake fails.
 */
idevice_error_t idevice_connection_enable_ssl(idevice_connection_t connection);

/**
 * Disable SSL for the given connection.
 *
 * @param connection The connection to disable SSL for.
 *
 * @return IDEVICE_E_SUCCESS on success, IDEVICE_E_INVALID_ARG when connection
 *     is NULL. This function also returns IDEVICE_E_SUCCESS when SSL is not
 *     enabled and does no further error checking on cleanup.
 */
idevice_error_t idevice_connection_disable_ssl(idevice_connection_t connection);

/* misc */

/**
 * Gets the handle of the device. Depends on the connection type.
 */
idevice_error_t idevice_get_handle(idevice_t device, uint32_t *handle);

/**
 * Gets the unique id for the device.
 */
idevice_error_t idevice_get_udid(idevice_t device, char **udid);

#ifdef __cplusplus
}
#endif

#endif