/*
 * Video On Demand Samples
 *
 * Copyright (C) 2015 Microchip Technology Germany II GmbH & Co. KG
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 * You may also obtain this software under a propriety license from Microchip.
 * Please contact Microchip for further information.
 *
 */

#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include "Console.h"

/*----------------------------------------------------------*/
/*! \brief Private structure used by UdpStream component.
 */
/*----------------------------------------------------------*/
typedef struct localVar_tag
{
	///Socket handle.
    int sock;
	///Target port.
    int port;
	///Target IP address as zero terminated string.
    char targetIpAddress[32];
	///SocketAddress structure to address remote node.
    struct sockaddr_in destination;
	///Helper variable to suppress a lot of error messages.
    bool errorMode;
} localVar_t;

static localVar_t udpLocal;

bool UdpStream_Init( const char *targetIp, int targetPort )
{
    if( ( NULL == targetIp ) || ( 0 == targetPort ) )
    {
        return false;
    }
    ConsolePrintf( PRIO_HIGH, "Sending UDP stream to IP:'%s', port:%d\n", targetIp, targetPort );
    strcpy( udpLocal.targetIpAddress, targetIp );
    udpLocal.port = targetPort;
    udpLocal.errorMode = false;

    memset( &udpLocal.destination, 0, sizeof( udpLocal.destination ) );

    /* Default send address */
    udpLocal.destination.sin_family = AF_INET;
    udpLocal.destination.sin_addr.s_addr = inet_addr( udpLocal.targetIpAddress );
    udpLocal.destination.sin_port = htons( udpLocal.port );

    if( ( udpLocal.sock = socket( PF_INET, SOCK_DGRAM, IPPROTO_UDP ) ) < 0 )
    {
        ConsolePrintf( PRIO_ERROR, RED"Failed to create socket"RESETCOLOR"\n" );
        return false;
    }
#if defined (SO_REUSEADDR) && defined (SO_REUSEPORT)
    int one = 1;    
    setsockopt(udpLocal.sock, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &one, sizeof(one));
#endif

    /* set default destination */
    setsockopt( udpLocal.sock, IPPROTO_IP, IP_MULTICAST_IF, &udpLocal.destination, sizeof( udpLocal.destination ) );

    // this call is what allows broadcast packets to be sent:
    int enableSocketFlag = 1;
    if( setsockopt( udpLocal.sock, SOL_SOCKET, SO_BROADCAST, &enableSocketFlag, sizeof( enableSocketFlag ) ) < 0 )
    {
        ConsolePrintf( PRIO_ERROR, RED"setsockopt (SO_BROADCAST) failed"RESETCOLOR"\n" );
        return false;
    }
    int ttl = 5;
    if (!(setsockopt( udpLocal.sock, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)))) {
            ConsolePrintf( PRIO_HIGH, "TTL set successfully to %d\n", ttl );
    } else {
            ConsolePrintf( PRIO_ERROR, "Error setting TTL: %s\n", strerror(errno));
    }

    return true;
}

void UdpStream_Close()
{
    close( udpLocal.sock );
}

bool UdpStream_Send( const uint8_t *data, uint32_t length )
{
    int is_length = sendto( udpLocal.sock, data, length,
        0, ( struct sockaddr * )&udpLocal.destination, sizeof( udpLocal.destination ) );
    if( is_length != length )
    {
        if( !udpLocal.errorMode )
        {
            udpLocal.errorMode = true;
            ConsolePrintf( PRIO_ERROR, RED"Send failed; shall len = %d; is length = %d"RESETCOLOR"\n", length, is_length );
        }
        return false;
    }
    else
        udpLocal.errorMode = false;

    return true;
}