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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 ip

 *  @{

 */

/** @file

 */

#include <async.h>

#include <errno.h>

#include <stdio.h>

#include <ipc/ipc.h>

#include <ipc/services.h>

#include "../../err.h"

#include "../../messages.h"

#include "../../modules.h"

#include "../../include/net_interface.h"

#include "../../include/sockaddr.h"

#include "../../include/socket.h"

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

#include "../../include/arp_interface.h"

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

#include "../../include/il_interface.h"

#include "../../include/ip_interface.h"

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

#include "../../structures/module_map.h"

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

#include "../../nil/nil_messages.h"

#include "../il_messages.h"

#include "ip.h"

#include "ip_module.h"

#define DEFAULT_IPV		4

#define ARP_NAME				"arp"

#define ARP_FILENAME			"/srv/arp"

ip_globals_t	ip_globals;

DEVICE_MAP_IMPLEMENT( ip_netifs, ip_netif_t )

INT_MAP_IMPLEMENT( ip_protos, ip_proto_t )

void	ip_driver_receiver( ipc_callid_t iid, ipc_call_t * icall );

int	ip_device_state_msg( int il_phone, device_id_t device_id, device_state_t state );

int	ip_register( int il_phone, int protocol, int phone );

/**	Initializes the module.

 */

int ip_initialize( void ){

	ERROR_DECLARE;

	ERROR_PROPAGATE( ip_netifs_initialize( & ip_globals.netifs ));

	ERROR_PROPAGATE( ip_protos_initialize( & ip_globals.protos ));

	ERROR_PROPAGATE( modules_initialize( & ip_globals.modules ));

	ERROR_PROPAGATE( add_module( NULL, & ip_globals.modules, ARP_NAME, ARP_FILENAME, SERVICE_ARP, arp_task_get_id(), arp_connect_module ));

	return EOK;

}

int ip_device_req( int il_phone, device_id_t device_id, services_t service ){

	ERROR_DECLARE;

	ip_netif_ref		ip_netif;

	measured_string_t	names[ 9 ] = {{ "IPV", 3 }, { "IP_CONFIG", 9 }, { "IP_ADDR", 7 }, { "NETMASK", 7 }, { "GATEWAY", 7 }, { "BROADCAST", 9 }, { "DNS1", 4 }, { "DNS2", 4 }, { "ARP", 3 }};

	measured_string_ref	configuration;

	int					count = 9;

	char *				data;

	int					index;

	configuration = & names[ 0 ];

	ip_netif = ( ip_netif_ref ) malloc( sizeof( ip_netif_t ));

	if( ! ip_netif ) return ENOMEM;

	ip_netif->device_id = device_id;

	// get configuration

	ERROR_PROPAGATE( net_get_device_conf_req( ip_globals.net_phone, ip_netif->device_id, & configuration, count, & data ));

	if( configuration ){

		if( configuration[ 0 ].value ){

			ip_netif->ipv = strtol( configuration[ 0 ].value, NULL, 0 );

		}else{

			ip_netif->ipv = DEFAULT_IPV;

		}

		ip_netif->dhcp = ! strncmp( configuration[ 1 ].value, "dhcp", 4 );

		if( ip_netif->dhcp ){

			// TODO dhcp

			net_free_settings( configuration, data );

			free( ip_netif );

			return ENOTSUP;

		}else if( ip_netif->ipv == 4 ){

			if( ERROR_OCCURRED( inet_pton( AF_INET, configuration[ 2 ].value, ( uint8_t * ) & ip_netif->address ))

			|| ERROR_OCCURRED( inet_pton( AF_INET, configuration[ 3 ].value, ( uint8_t * ) & ip_netif->netmask ))

			|| ( inet_pton( AF_INET, configuration[ 4 ].value, ( uint8_t * ) & ip_netif->gateway ) == EINVAL )

			|| ( inet_pton( AF_INET, configuration[ 5 ].value, ( uint8_t * ) & ip_netif->broadcast ) == EINVAL )

			|| ( inet_pton( AF_INET, configuration[ 6 ].value, ( uint8_t * ) & ip_netif->dns1 ) == EINVAL )

			|| ( inet_pton( AF_INET, configuration[ 7 ].value, ( uint8_t * ) & ip_netif->dns2 ) == EINVAL )){

				net_free_settings( configuration, data );

				free( ip_netif );

				return EINVAL;

			}

		}else{

			// TODO ipv6

			net_free_settings( configuration, data );

			free( ip_netif );

			return ENOTSUP;

		}

		if( configuration[ 8 ].value ){

			ip_netif->arp = get_running_module( & ip_globals.modules, configuration[ 8 ].value );

			if( ! ip_netif->arp ){

				printf( "Failed to start the arp %s\n", configuration[ 8 ].value );

				net_free_settings( configuration, data );

				free( ip_netif );

				return EINVAL;

			}

		}else{

			ip_netif->arp = NULL;

		}

		net_free_settings( configuration, data );

	}

	ip_netif->phone = bind_service( service, ip_netif->device_id, SERVICE_IP, 0, ip_driver_receiver );

	if( ip_netif->phone < 0 ){

		printf( "Failed to contact the nil service %d\n", service );

		free( ip_netif );

		return ip_netif->phone;

	}

	if( ip_netif->arp ){

		configuration[ 0 ].value = ( char * ) & ip_netif->address;

		configuration[ 0 ].length = CONVERT_SIZE( in_addr_t, char, 1 );

		if( ERROR_OCCURRED( arp_device_req( ip_netif->arp->phone, ip_netif->device_id, SERVICE_IP, service, & configuration[ 0 ] ))){

			free( ip_netif );

			return ERROR_CODE;

		}

	}

	index = ip_netifs_add( & ip_globals.netifs, ip_netif->device_id, ip_netif );

	if( index < 0 ){

		free( ip_netif );

		return index;

	}

	if( ip_netif->arp ) ++ ip_netif->arp->usage;

	// print the settings

	printf( "New device registered:\n\tid\t= %d\n\tphone\t= %d\n\tIPV\t= %d\n", ip_netif->device_id, ip_netif->phone, ip_netif->ipv );

	printf( "\tconfiguration\t= %s\n", ip_netif->dhcp ? "dhcp" : "static" );

	// TODO ipv6 addresses

	data = malloc( INET_ADDRSTRLEN );

	if( data ){

		inet_ntop( AF_INET, ( uint8_t * ) & ip_netif->address, data, INET_ADDRSTRLEN );

		printf( "\taddress\t= %s\n", data );

		inet_ntop( AF_INET, ( uint8_t * ) & ip_netif->netmask, data, INET_ADDRSTRLEN );

		printf( "\tnetmask\t= %s\n", data );

		inet_ntop( AF_INET, ( uint8_t * ) & ip_netif->gateway, data, INET_ADDRSTRLEN );

		printf( "\tgateway\t= %s\n", data );

		inet_ntop( AF_INET, ( uint8_t * ) & ip_netif->broadcast, data, INET_ADDRSTRLEN );

		printf( "\tbroadcast\t= %s\n", data );

		inet_ntop( AF_INET, ( uint8_t * ) & ip_netif->dns1, data, INET_ADDRSTRLEN );

		printf( "\tdns1\t= %s\n", data );

		inet_ntop( AF_INET, ( uint8_t * ) & ip_netif->dns2, data, INET_ADDRSTRLEN );

		printf( "\tdns2\t= %s\n", data );

		free( data );

	}

	return EOK;

}

void ip_driver_receiver( ipc_callid_t iid, ipc_call_t * icall ){

	ERROR_DECLARE;

	ipc_callid_t	callid;

	ipc_call_t	call;

//	ipc_call_t	answer;

//	int		count;

	int		result;

	packet_t	packet;

	/*

	 * Accept the connection

	 *  - Answer the first IPC_M_CONNECT_ME_TO call.

	 */

	ipc_answer_0( iid, EOK );

	while( true ){

/*		// refresh data

		count = 0;

		IPC_SET_RETVAL( answer, 0 );

		// just to be precize

		IPC_SET_RETVAL( answer, 0 );

		IPC_SET_ARG1( answer, 0 );

		IPC_SET_ARG2( answer, 0 );

		IPC_SET_ARG3( answer, 0 );

		IPC_SET_ARG4( answer, 0 );

		IPC_SET_ARG5( answer, 0 );

*/

		callid = async_get_call( & call );

		switch( IPC_GET_METHOD( call )){

			case NET_IL_DEVICE_STATE:

			case NET_NIL_DEVICE_STATE:

				result = ip_device_state_msg( 0, IPC_GET_DEVICE( & call ), IPC_GET_STATE( & call ));

				ipc_answer_0( callid, result );

				break;

			// TODO packer received

			case NET_IL_RECEIVED:

			case NET_NIL_RECEIVED:

				if( ! ERROR_OCCURRED( result = packet_translate( ip_globals.net_phone, & packet, IPC_GET_PACKET( & call )))){

					//result = il_receive_msg( 0, IPC_GET_DEVICE( call ), packet );

				}

				ipc_answer_0( callid, result );

				break;

		}

	}

}

int ip_device_state_msg( int il_phone, device_id_t device_id, device_state_t state ){

	ERROR_DECLARE;

	ip_netif_ref	netif;

	measured_string_t address;

	measured_string_ref	translation;

	char *			data;

	netif = ip_netifs_find( & ip_globals.netifs, device_id );

	if( ! netif ) return ENOENT;

	// TODO state

	printf( "ip - device %d changed state to %d\n\n", device_id, state );

	if( netif->arp ){

		address.value = ( char * ) & netif->gateway;

		address.length = CONVERT_SIZE( in_addr_t, char, 1 );

		ERROR_PROPAGATE( arp_translate_req( netif->arp->phone, netif->device_id, SERVICE_IP, & address, & translation, & data ));

		printf( "\tgateway translated to\t= %X:%X:%X:%X:%X:%X\n", data[ 0 ], data[ 1 ], data[ 2 ], data[ 3 ], data[ 4 ], data[ 5 ] );

		free( translation );

		free( data );

	}

	return EOK;

}

int	ip_bind_service( services_t service, services_t me, async_client_conn_t receiver ){

	//TODO receive function

	return EOK;

}

int ip_connect_module( services_t service ){

	return EOK;

}

int ip_register( int il_phone, int protocol, int phone ){

	ip_proto_ref	proto;

	int				index;

	proto = ( ip_proto_ref ) malloc( sizeof( ip_protos_t ));

	if( ! proto ) return ENOMEM;

	proto->protocol = protocol;

	proto->phone = phone;

	index = ip_protos_add( & ip_globals.protos, proto->protocol, proto );

	if( index < 0 ){

		free( proto );

		return index;

	}

	printf( "New protocol registered:\n\tprotocol\t= %d\n\tphone\t= %d\n", proto->protocol, proto->phone );

	return EOK;

}

int ip_send_msg( int il_phone, device_id_t device_id, packet_t packet, services_t target ){

	// TODO send packet

	printf( "Packet to send via %d: %s\n", device_id, packet_get_data( packet ));

	pq_release( ip_globals.net_phone, packet_get_id( packet ));

	return EOK;

}

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

	ERROR_DECLARE;

	packet_t	packet;

	* answer_count = 0;

	switch( IPC_GET_METHOD( * call )){

		case IPC_M_PHONE_HUNGUP:

			return EOK;

		case NET_IL_DEVICE:

			return ip_device_req( 0, IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ));

		case IPC_M_CONNECT_TO_ME:

			return ip_register( 0, IL_GET_PROTO( call ), IPC_GET_PHONE( call ));

		case NET_IL_SEND:

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

			return ip_send_msg( 0, IPC_GET_DEVICE( call ), packet, 0 );

	}

	return ENOTSUP;

}

/** @}

 */