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// basic_osip_sample.cpp : Defines the entry point for the console application.
// http://www.gnu.org/software/osip/doc/html/group__howto0__initialize.html
#include "stdafx.h"
#define ENABLE_TRACE
#include "winsock2.h"
#include "osip2/osip.h"
#include <osip2/osip_mt.h>
#include <iostream>
#include <sstream>
#include <assert.h>

#define	UNUSED(x) (void(x))

using namespace std;

static SOCKET g_sock;
static const size_t BUFFSIZE = 1600;  // MTU usually doesn't exceed 1600

int cb_SendMsg(osip_transaction_t *tr, osip_message_t *sip, char *, int port, int out_socket)
{
	UNUSED(out_socket);
	UNUSED(tr);
	UNUSED(port);
	char *msgP;
	size_t msgLen;
	osip_message_to_str(sip, &msgP, &msgLen);
	
	stringstream ss;
	ss << tr->topvia->host << ':' << tr->topvia->port;
	struct sockaddr addr;
	int addrSize = sizeof(struct sockaddr);
	WSAStringToAddressA(const_cast<LPSTR>(ss.str().c_str()), AF_INET, NULL, &addr, &addrSize);

	sendto(out_socket, msgP, msgLen, 0, &addr, addrSize);
	return 0;
}

int BuildResponse(const osip_message_t *request, osip_message_t **response)
{
	osip_message_t *msg = NULL;
	osip_message_init(&msg);

	osip_from_clone(request->from, &msg->from);
	osip_to_clone(request->to, &msg->to);
	osip_cseq_clone(request->cseq, &msg->cseq);
	osip_call_id_clone(request->call_id, &msg->call_id);

	int pos = 0;//copy vias from request to response
	while (!osip_list_eol (&request->vias, pos))
	{
		osip_via_t *via;
		osip_via_t *via2;

		via = (osip_via_t *) osip_list_get (&request->vias, pos);
		int i = osip_via_clone (via, &via2);
		if (i != 0)
		{
			osip_message_free (msg);
			return i;
		}
		osip_list_add (&(msg->vias), via2, -1);
		pos++;
	}
	
	osip_to_set_tag(msg->to, osip_strdup("4893693")); // set to tag in response
	osip_message_set_version(msg, osip_strdup("SIP/2.0"));
	osip_message_set_contact(msg, osip_strdup("sip:raymond@127.0.0.1"));
	osip_message_set_user_agent(msg, osip_strdup("Linphone/3.2.1 (eXosip2/3.3.0)"));
	*response = msg;
	return 0;
}

void cb_RcvICTRes(int, osip_transaction_t *, osip_message_t *)
{
	OutputDebugString(TEXT("cb_RcvICTRes fired"));
}

void cb_RcvNICTRes(int, osip_transaction_t *, osip_message_t *)
{
	OutputDebugString(TEXT("cb_RcvNICTRes fired"));
}

void cb_ISTTranKill(int, osip_transaction_t *)
{
	OutputDebugString(TEXT("cb_ISTTranKill fired"));
}

void* Notify(void* arg)
{	
	osip_transaction_t *tran = static_cast<osip_transaction_t*>(arg);
	
	osip_message_t *response = NULL;	
	osip_event_t *evt = NULL;
	BuildResponse(tran->orig_request, &response);

	cout << "incoming call from " << tran->from->url << endl << " [a]nswer or [d]ecline?" << endl;
	char act = 'd';
	cin >> act;
	if('a' == act)
	{//accept call
		osip_message_set_status_code(response, SIP_OK);
		osip_message_set_reason_phrase(response, osip_strdup("OK"));
		const char* mime = "application/sdp";
		osip_message_set_body_mime(response, mime, strlen(mime));
		osip_message_set_content_type(response, mime);
		const char* sdp = "v=0\r\n\
o=raymond 323456 654323 IN IP4 127.0.0.1\r\n\
s=A conversation\r\n\
c=IN IP4 127.0.0.1\r\n\
t=0 0\r\n\
m=audio 7078 RTP/AVP 111 110 0 8 101\r\n\
a=rtpmap:111 speex/16000/1\r\n\
a=rtpmap:110 speex/8000/1\r\n\
a=rtpmap:0 PCMU/8000/1\r\n\
a=rtpmap:8 PCMA/8000/1\r\n\
a=rtpmap:101 telephone-event/8000\r\n\
a=fmtp:101 0-11\r\n";
		
		osip_message_set_body(response, osip_strdup(sdp), strlen(sdp));
	}
	else
	{//decline call
		osip_message_set_status_code(response, SIP_DECLINE);
		osip_message_set_reason_phrase(response, osip_strdup("Decline"));
		osip_message_set_contact(response, NULL);
	}

	evt = osip_new_outgoing_sipmessage(response);
	evt->transactionid = tran->transactionid;
	osip_transaction_add_event(tran, evt);
	return NULL;
}

void cb_RcvISTReq(int, osip_transaction_t *tran, osip_message_t *msg)
{	
	osip_message_t *response = NULL;	
	osip_event_t *evt = NULL;

	BuildResponse(msg, &response);//trying
	osip_message_set_status_code(response, SIP_TRYING);
	evt = osip_new_outgoing_sipmessage(response);	
	osip_message_set_reason_phrase(response, osip_strdup("Trying"));
	osip_transaction_add_event(tran, evt);
	
	BuildResponse(msg, &response);//dialog establishement
	osip_message_set_status_code(response, 101);
	evt = osip_new_outgoing_sipmessage(response);	
	osip_message_set_reason_phrase(response, osip_strdup("Dialog Establishement"));
	osip_transaction_add_event(tran, evt);

	BuildResponse(msg, &response);//ringing
	osip_message_set_status_code(response, SIP_RINGING);
	evt = osip_new_outgoing_sipmessage(response);	
	osip_message_set_reason_phrase(response, osip_strdup("Ringing"));
	osip_transaction_add_event(tran, evt);

	osip_thread_create(0, Notify, tran);// start another thread to notify user the incoming call
}

void SetCallbacks(osip_t *osip)
{
	osip_set_cb_send_message(osip, cb_SendMsg);
	osip_set_message_callback(osip, OSIP_ICT_STATUS_1XX_RECEIVED, cb_RcvICTRes);
	osip_set_message_callback(osip, OSIP_NICT_STATUS_1XX_RECEIVED, cb_RcvNICTRes);
	osip_set_message_callback(osip, OSIP_IST_INVITE_RECEIVED, cb_RcvISTReq);
	osip_set_kill_transaction_callback(osip, OSIP_IST_KILL_TRANSACTION, cb_ISTTranKill);
}

SOCKET InitNet()
{
	WSADATA wsaData;
	WSAStartup(MAKEWORD(2,2), &wsaData);
	SOCKET sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
	TCHAR ip[] = TEXT("0.0.0.0:5060");
	struct sockaddr addr;
	int addrSize = sizeof(struct sockaddr);
	WSAStringToAddress(ip, AF_INET, NULL, &addr, &addrSize);
	bind(sock, &addr, addrSize);
	return sock;
}

void ProcessNewReq(osip_t* osip, osip_event_t *evt)
{
	osip_transaction_t *tran;
	osip_transaction_init(&tran, IST, osip, evt->sip);
	//osip_transaction_set_in_socket (tran, socket);
	osip_transaction_set_out_socket (tran, g_sock);
	osip_transaction_set_your_instance(tran, osip);// store osip in transaction for later usage
	osip_transaction_add_event(tran, evt);
}

void* TransportFun(void* arg)
{
	int rc;
	osip_t* osip = static_cast<osip_t*>(arg);
		
	OutputDebugString(TEXT("initialize network"));
	g_sock = InitNet();	
	assert(0 < g_sock);
	char buf[BUFFSIZE];
	while(true)
	{
		struct sockaddr from;
		int addrSize = sizeof(struct sockaddr);
		int len = recvfrom(g_sock, buf, BUFFSIZE, 0, &from, &addrSize);
		if(len < 1)
			continue;
		buf[len] = 0;
		WCHAR addrBuf[1024];
		DWORD addrBufLen;
		WSAAddressToString(&from, addrSize, NULL, addrBuf, &addrBufLen);
		
		osip_event_t *evt = osip_parse(buf, len);
		rc = osip_find_transaction_and_add_event(osip, evt);
		if(0 != rc)
		{
			OutputDebugString(TEXT("this event has no transaction, create a new one."));
			ProcessNewReq(osip, evt);
		}
	}
	return NULL;
}

int main(int argc, _TCHAR* argv[])
{
	UNUSED(argc); UNUSED(argv);
	osip_t* osip = NULL;
	osip_init(&osip);
	SetCallbacks(osip);
	osip_thread_create(0, TransportFun, osip);
	while(true)
	{		
		osip_ict_execute(osip);
		osip_ist_execute(osip);
		osip_nict_execute(osip);
		osip_nist_execute(osip);
		osip_timers_ict_execute(osip);
		osip_timers_ist_execute(osip);
		osip_timers_nict_execute(osip);
		osip_timers_nist_execute(osip);
	}
	return 0;
}