/*
 * Copyright (C) 2011, 2012, 2013 Citrix Systems
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``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 PROJECT OR CONTRIBUTORS 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.
 */

#include "ns_turn_maps_rtcp.h"

#include "ns_turn_utils.h"
#include "ns_turn_ioaddr.h"

////////////////////////////////////////////

#define MAGIC_RTCP_MAP (0x76859403)
#define RTCP_TIMEOUT (300)
#define MAX_TOKEN_DEL (1024)

////////////////////////////////////////////

struct _rtcp_map {
  uint32_t magic;
  ur_map *map;
  ioa_timer_handle timer_ev;
  TURN_MUTEX_DECLARE(mutex)
};


typedef struct {
  ioa_socket_handle s;
  turn_time_t t;
  rtcp_token_type token;
} rtcp_alloc_type;

////////////////////////////////////////////

static int rtcp_map_valid(const rtcp_map *map) {
  return (map && (map->magic==MAGIC_RTCP_MAP) && map->map);
}

typedef struct {
  rtcp_token_type tokens[MAX_TOKEN_DEL];
  int tn;
  turn_time_t t;
} timeout_check_arg_type;

static int timeout_check(ur_map_key_type key, 
			 ur_map_value_type value, 
			 void *arg) {
  
  if(value && arg) {
    
    timeout_check_arg_type *tcat=(timeout_check_arg_type*)arg;
    
    rtcp_alloc_type* rat=(rtcp_alloc_type*)value;
    
    if(turn_time_before(rat->t, tcat->t) && (tcat->tn<MAX_TOKEN_DEL)) {
      tcat->tokens[(tcat->tn)++]=key;
    }
  }
  
  return 0;
}

static void rtcp_alloc_free(ur_map_value_type value)
{
	rtcp_alloc_type *at = (rtcp_alloc_type *)value;
	if (at) {
		IOA_CLOSE_SOCKET(at->s);
		free(at);
	}
}

static void rtcp_alloc_free_savefd(ur_map_value_type value)
{
	rtcp_alloc_type *at = (rtcp_alloc_type *) value;
	if (at) {
		free(at);
	}
}

static int foreachcb_free(ur_map_key_type key, ur_map_value_type value) {
  UNUSED_ARG(key);
  if(value) {
    rtcp_alloc_free(value);
  }
  return 0;
}

/**
 * @ret:
 * 1 - success
 * 0 - not found
 */
static int rtcp_map_del(rtcp_map* map, rtcp_token_type token) {
  if(!rtcp_map_valid(map)) return 0;
  else {
    TURN_MUTEX_LOCK(&map->mutex);
    int ret = ur_map_del(map->map,token,rtcp_alloc_free);
    TURN_MUTEX_UNLOCK(&map->mutex);
    return ret;
  }
}

static int rtcp_map_del_savefd(rtcp_map* map, rtcp_token_type token) {
  if(!rtcp_map_valid(map)) return 0;
  else {
    int ret = ur_map_del(map->map,token,rtcp_alloc_free_savefd);
    return ret;
  }
}

static void rtcp_map_timeout_handler(ioa_engine_handle e, void* arg) {
  
  UNUSED_ARG(e);

  if(!arg) return;

  rtcp_map* map=(rtcp_map*)arg;

  if(rtcp_map_valid(map)) {

    TURN_MUTEX_LOCK(&map->mutex);

    timeout_check_arg_type tcat;
    tcat.tn=0;
    tcat.t=turn_time();
    
    ur_map_foreach_arg(map->map, timeout_check, &tcat);

    TURN_MUTEX_UNLOCK(&map->mutex);

    int i=0;
    for(i=0;i<tcat.tn;i++) {
      rtcp_map_del(map,tcat.tokens[i]);
    }
  }
}

static int rtcp_map_init(rtcp_map* map, ioa_engine_handle e) {
	if (map) {
		if (map->magic != MAGIC_RTCP_MAP) {
			map->magic = MAGIC_RTCP_MAP;
			map->map = ur_map_create();
			if (e)
				map->timer_ev = set_ioa_timer(e, 3, 0, rtcp_map_timeout_handler,
						map, 1, "rtcp_map_timeout_handler");
			TURN_MUTEX_INIT(&map->mutex);
			if (rtcp_map_valid(map))
				return 0;
		}
	}
	return -1;
}

rtcp_map* rtcp_map_create(ioa_engine_handle e) {
  rtcp_map *map=(rtcp_map*)malloc(sizeof(rtcp_map));
  bzero(map,sizeof(rtcp_map));
  if(rtcp_map_init(map,e)<0) {
    free(map);
    return NULL;
  }
  return map;
}

/**
 * @ret:
 * 0 - success
 * -1 - error
 */
int rtcp_map_put(rtcp_map* map, rtcp_token_type token, ioa_socket_handle s) {
  if(!rtcp_map_valid(map)) return -1;
  else {
    rtcp_alloc_type *value=(rtcp_alloc_type*)malloc(sizeof(rtcp_alloc_type));
    if(!value) return -1;
    bzero(value,sizeof(rtcp_alloc_type));
    value->s=s;
    value->t=turn_time() + RTCP_TIMEOUT;
    value->token=token;
    TURN_MUTEX_LOCK(&map->mutex);
    int ret = ur_map_put(map->map,token,(ur_map_value_type)value);
    //TURN_LOG_FUNC(TURN_LOG_LEVEL_INFO,"%s: 111.111: ret=%d, token=%llu\n",__FUNCTION__,ret,token);
    TURN_MUTEX_UNLOCK(&map->mutex);
    if(ret<0) free(value);
    return ret;
  }
}

/**
 * @ret:
 * >=0 - success
 * <0 - not found
 */
ioa_socket_handle rtcp_map_get(rtcp_map* map, rtcp_token_type token) {
	ioa_socket_handle s = NULL;
	if (rtcp_map_valid(map)) {
		ur_map_value_type value;
		TURN_MUTEX_LOCK(&map->mutex);
		int ret = ur_map_get(map->map, token, &value);
		if (ret) {
			rtcp_alloc_type* rval = (rtcp_alloc_type*) value;
			if (rval) {
				s = rval->s;
				rtcp_map_del_savefd(map, token);
			}
		}
		TURN_MUTEX_UNLOCK(&map->mutex);
	}
	return s;
}

void rtcp_map_free(rtcp_map** map) {
  if(map && rtcp_map_valid(*map)) {
    TURN_MUTEX_LOCK(&((*map)->mutex));
    IOA_EVENT_DEL((*map)->timer_ev);
    ur_map_foreach((*map)->map, foreachcb_free);
    ur_map_free(&((*map)->map));
    (*map)->magic=0;
    TURN_MUTEX_UNLOCK(&((*map)->mutex));
    TURN_MUTEX_DESTROY(&((*map)->mutex));
    free(*map);
    *map=NULL;
  }
}

size_t rtcp_map_size(const rtcp_map* map) {
  if(rtcp_map_valid(map)) {
    TURN_MUTEX_LOCK(&map->mutex);
    size_t ret = ur_map_size(map->map);
    TURN_MUTEX_UNLOCK(&map->mutex);
    return ret;
  } else {
    return 0;
  }
}

////////////////////////////////////////////////////////////////