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/*

 * Copyright (c) 2009 Lukas Mejdrech

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup netif

 *  @{

 */

/** @file

 *  Network interface module skeleton implementation.

 *  @see netif.h

 */

#include <async.h>

#include <mem.h>

#include <rwlock.h>

#include <stdio.h>

#include <ipc/ipc.h>

#include <ipc/services.h>

#include "../err.h"

#include "../messages.h"

#include "../modules.h"

#include "../structures/packet/packet.h"

#include "../structures/packet/packet_client.h"

#include "../structures/measured_strings.h"

#include "../include/device.h"

#include "../include/netif_interface.h"

#include "../include/nil_interface.h"

#include "netif.h"

#include "netif_messages.h"

#include "netif_module.h"

/** Network interface module global data.

 */

extern netif_globals_t netif_globals;

DEVICE_MAP_IMPLEMENT( device_map, device_t )

/** Registers the device notification receiver, the network interface layer module.

 *  @param device_id The device identifier. Input parameter.

 *  @param phone The network interface layer module phone. Input parameter.

 *  @returns EOK on success.

 *  @returns ENOENT if there is no such device.

 *  @returns ELIMIT if there is another module registered.

 */

int register_message( device_id_t device_id, int phone );

int netif_probe_req( int netif_phone, device_id_t device_id, int irq, int io ){

    int result;

    rwlock_write_lock( & netif_globals.lock );

    result = netif_probe_message( device_id, irq, io );

    rwlock_write_unlock( & netif_globals.lock );

    return result;

}

int netif_send_msg( int netif_phone, device_id_t device_id, packet_t packet, services_t sender ){

    int result;

    rwlock_write_lock( & netif_globals.lock );

    result = netif_send_message( device_id, packet, sender );

    rwlock_write_unlock( & netif_globals.lock );

    return result;

}

int netif_start_req( int netif_phone, device_id_t device_id ){

    ERROR_DECLARE;

    device_ref  device;

    int result;

    int phone;

    rwlock_write_lock( & netif_globals.lock );

    if( ERROR_OCCURRED( find_device( device_id, & device ))){

        rwlock_write_unlock( & netif_globals.lock );

        return ERROR_CODE;

    }

    result = netif_start_message( device );

    if( result > NETIF_NULL ){

        phone = device->nil_phone;

        rwlock_write_unlock( & netif_globals.lock );

        nil_device_state_msg( phone, device_id, result );

        return EOK;

    }else{

        rwlock_write_unlock( & netif_globals.lock );

    }

    return result;

}

int netif_stop_req( int netif_phone, device_id_t device_id ){

    ERROR_DECLARE;

    device_ref  device;

    int result;

    int phone;

    rwlock_write_lock( & netif_globals.lock );

    if( ERROR_OCCURRED( find_device( device_id, & device ))){

        rwlock_write_unlock( & netif_globals.lock );

        return ERROR_CODE;

    }

    result = netif_stop_message( device );

    if( result > NETIF_NULL ){

        phone = device->nil_phone;

        rwlock_write_unlock( & netif_globals.lock );

        nil_device_state_msg( phone, device_id, result );

        return EOK;

    }else{

        rwlock_write_unlock( & netif_globals.lock );

    }

    return result;

}

int netif_get_addr( int netif_phone, device_id_t device_id, measured_string_ref * address, char ** data ){

    ERROR_DECLARE;

    measured_string_t   translation;

    if( !( address && data )) return EBADMEM;

    rwlock_read_lock( & netif_globals.lock );

    if( ! ERROR_OCCURRED( netif_get_addr_message( device_id, & translation ))){

        * address = measured_string_copy( & translation );

        ERROR_CODE = ( * address ) ? EOK : ENOMEM;

    }

    rwlock_read_unlock( & netif_globals.lock );

    * data = ( ** address ).value;

    return ERROR_CODE;

}

int netif_bind_service( services_t service, device_id_t device_id, services_t me, async_client_conn_t receiver ){

    return EOK;

}

int find_device( device_id_t device_id, device_ref * device ){

    if( ! device ) return EBADMEM;

    * device = device_map_find( & netif_globals.device_map, device_id );

    if( ! * device ) return ENOENT;

    if(( ** device ).state == NETIF_NULL ) return EPERM;

    return EOK;

}

void null_device_stats( device_stats_ref stats ){

    bzero( stats, sizeof( device_stats_t ));

}

int register_message( device_id_t device_id, int phone ){

    ERROR_DECLARE;

    device_ref  device;

    ERROR_PROPAGATE( find_device( device_id, & device ));

    if( device->nil_phone > 0 ) return ELIMIT;

    device->nil_phone = phone;

    printf( "New receiver of the device %d registered:\n\tphone\t= %d\n", device->device_id, device->nil_phone );

    return EOK;

}

int netif_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){

    ERROR_DECLARE;

    size_t              length;

    device_stats_t      stats;

    packet_t            packet;

    measured_string_t   address;

//  printf( "message %d - %d\n", IPC_GET_METHOD( * call ), NET_NETIF_FIRST );

    * answer_count = 0;

    switch( IPC_GET_METHOD( * call )){

        case IPC_M_PHONE_HUNGUP:

            return EOK;

        case NET_NETIF_PROBE_AUTO:

            rwlock_write_lock( & netif_globals.lock );

            ERROR_CODE = netif_probe_auto_message();

            rwlock_write_unlock( & netif_globals.lock );

            return ERROR_CODE;

        case NET_NETIF_PROBE:

            return netif_probe_req( 0, IPC_GET_DEVICE( call ), NETIF_GET_IRQ( call ), NETIF_GET_IO( call ));

        case IPC_M_CONNECT_TO_ME:

            rwlock_write_lock( & netif_globals.lock );

            ERROR_CODE = register_message( IPC_GET_DEVICE( call ), IPC_GET_PHONE( call ));

            rwlock_write_unlock( & netif_globals.lock );

            return ERROR_CODE;

        case NET_NETIF_SEND:

        case NET_NIL_SEND:

            ERROR_PROPAGATE( packet_translate( netif_globals.net_phone, & packet, IPC_GET_PACKET( call )));

            return netif_send_msg( 0, IPC_GET_DEVICE( call ), packet, IPC_GET_SENDER( call ));

        case NET_NETIF_START:

            return netif_start_req( 0, IPC_GET_DEVICE( call ));

        case NET_NETIF_STATS:

            rwlock_read_lock( & netif_globals.lock );

            if( ! ERROR_OCCURRED( ipc_data_read_receive( & callid, & length ))){

                if( length < sizeof( device_stats_t )){

                    ERROR_CODE = EOVERFLOW;

                }else{

                    if( ! ERROR_OCCURRED( netif_get_device_stats( IPC_GET_DEVICE( call ), & stats ))){

                        ERROR_CODE = ipc_data_read_finalize( callid, & stats, sizeof( device_stats_t ));

                    }

                }

            }

            rwlock_read_unlock( & netif_globals.lock );

            return ERROR_CODE;

        case NET_NETIF_STOP:

            return netif_stop_req( 0, IPC_GET_DEVICE( call ));

        case NET_NETIF_GET_ADDR:

        case NET_NIL_ADDR:

            rwlock_read_lock( & netif_globals.lock );

            if( ! ERROR_OCCURRED( netif_get_addr_message( IPC_GET_DEVICE( call ), & address ))){

                ERROR_CODE = measured_strings_reply( & address, 1 );

            }

            rwlock_read_unlock( & netif_globals.lock );

            return ERROR_CODE;

    }

    return netif_specific_message( callid, call, answer, answer_count );

}

int netif_init_module( async_client_conn_t client_connection ){

    ERROR_DECLARE;

    async_set_client_connection( client_connection );

    netif_globals.net_phone = connect_to_service( SERVICE_NETWORKING );

    device_map_initialize( & netif_globals.device_map );

    ERROR_PROPAGATE( pm_init());

    rwlock_initialize( & netif_globals.lock );

    if( ERROR_OCCURRED( netif_initialize())){

        pm_destroy();

        return ERROR_CODE;

    }

    return EOK;

}

int netif_run_module( void ){

    async_manager();

    pm_destroy();

    return EOK;

}

void netif_pq_release( packet_id_t packet_id ){

    pq_release( netif_globals.net_phone, packet_id );

}

packet_t netif_packet_get_1( size_t content ){

    return packet_get_1( netif_globals.net_phone, content );

}

/** @}

 */