/////////////////////////////////////////////////////////////////////////////////
//
// nwthread.cc is part of TestModbus-Client.
//
/////////////////////////////////////////////////////////////////////////////////

#include <errno.h>
#include <glib.h>
#include <sys/time.h>

#include <string>
#include <string.h>

#if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)
#else
  #include <unistd.h> /* close() */
#endif

#include "tcp.h"
#include "nwthread.h"
#include "client.h"

extern NetworkThread netthread;

// c / C++ wrapper
gpointer _Thread (gpointer data) {
	netthread.Thread ();
	return NULL;
};



NetworkThread::NetworkThread() {
	g_mutex_init (&mutex);
	thread = NULL;
	state = 0;
	host = "";
	port = "";
	memset (&req_mbh, 0x0, sizeof(modbustcp_rq_header));
	req_new = 0;
	memset (&req_time, 0x0, sizeof (req_time));
	req_timeout = 0;
};

NetworkThread::~NetworkThread() {
	Disconnect();
	g_mutex_clear(&mutex);
};

void NetworkThread::Lock() {
	g_mutex_lock(&mutex);
};

void NetworkThread::UnLock() {
	g_mutex_unlock(&mutex);
};


/*
 * start network thread and connect
 */
int NetworkThread::Connect(std::string dest_host, std::string dest_port) {
	printf ("%s:%d NetworkThread::Connect to %s:%s\n", __FILE__, __LINE__, dest_host.c_str(), dest_port.c_str());

	//
	// if there is an open connection close this one first
	if (GetState() != NWT_nothing) Disconnect();

	host = dest_host;
	port = dest_port;
	thread = g_thread_new("network thread", _Thread, NULL);

	return -1;
};


/*
 * stop network connection
 */
int NetworkThread::Disconnect() {
	printf ("%s:%d NetworkThread::Disconnect\n", __FILE__, __LINE__);

	Lock();
	if (state != NWT_nothing) state = NWT_close;
	UnLock();
	while (GetState() != NWT_nothing) { usleep(1000); };

	if (thread != NULL)	g_thread_unref(thread);
	thread = NULL;

	return 0;
};


void NetworkThread::SetState(int s) {
	Lock();
	state = s;
	UnLock();
};


int NetworkThread::GetState() {
	int s;

	Lock();
	s = state;
	UnLock();

	return s;
};


int NetworkThread::SendRequestRead(int unitid, int fc, int reg, int num) {
	Lock();
	if (req_mbh.fc != 0 || req_new != 0) {
		printf ("%s%d %s req_new: %d  req_mbh.fc: %d\n", __FILE__, __LINE__, __FUNCTION__,
				req_new, req_mbh.fc);
		UnLock();
		return 0;
	}

	req_new = 1;
	req_mbh.fc = fc;
	req_mbh.offset = reg;
	req_mbh.number = num;
	req_mbh.uid = unitid;

	printf ("%s:%d build request fc:%d offset:%d number:%d\n", __FILE__, __LINE__,
		req_mbh.fc, req_mbh.offset, req_mbh.number);

	UnLock();
	return 1;
}


void NetworkThread::GuiSendStatustext(char *txt) {
	char *msg = NULL;
	if (txt) {
		int l = strlen (txt)+1;
		msg = (char*) malloc(l+1);
		memset (msg, 0x0, l+1);
		strncpy (msg, txt, strlen (txt));
	}
	gdk_threads_add_idle(mbcli_thread_cb_status, msg);
}



/*
 * send response to the gui.
 * the data block must be freed.
 */
void NetworkThread::GuiSendResult(char *buffer, int len, modbustcp_rq_header *mbh_rq) {
	NWTReqResult *res = (NWTReqResult*) malloc(sizeof (NWTReqResult));
	int i, cnt;
	uint16_t tmp;

	res->fc = mbh_rq->fc;
	res->cnt = mbh_rq->number;
	res->reg = mbh_rq->offset;

	if (res->fc == 1 || res->fc == 2) {

	}
	else {
		for (cnt = 0, i = 9; i < len && cnt < 0x100 && cnt < mbh_rq->number; cnt++) {
			memcpy (&tmp, buffer+i, 2);
			res->data[cnt] = ntohs(tmp);
			i += 2;
		}
	}

	gdk_threads_add_idle(mbcli_thread_cb_net, (void *) res);
}

/*
 * data must be Thread Locked already
 * request information must be set already
 */
void NetworkThread::BuildAndSendReadReq(char *buffer, int size) {
	char *pos;

	req_mbh.length = 0;
	req_mbh.transid++;
	pos = modbustcp_pkt_headerrq(buffer, size, &req_mbh);
	tcp.Write(buffer, (pos-buffer));
};


#define BUFFER_SIZE 0x10000
void NetworkThread::Thread() {
	int i;
	long int len;
	char buffer[BUFFER_SIZE];
	modbustcp_res_header in_mbh;		// incomming mbh data
	char *pos;

	printf ("%s:%d NetworkThread::Thread Started\n", __FILE__, __LINE__);

	GuiSendStatustext((char*)"connecting");
	Lock();
	req_mbh.fc = 0;
	req_mbh.transid = 0;
	UnLock();

	//
	// connect to ip address
	//
	SetState (NWT_connect);
	i = tcp.Connect(host, port);
	if (i < 0) {
		//
		// error on connect, stop thread.
		GuiSendStatustext(strerror(errno));

		SetState(NWT_nothing);
		GuiSendStatustext(NULL);
		printf ("%s:%d NetworkThread::Thread Finished on connect\n", __FILE__, __LINE__);

		return;
	}
	if (i == 1) GuiSendStatustext((char*)"connected");
	// FIXME: else: still connecting need some timeout and checks.

	SetState(NWT_running);
	//
	// connection established
	// go into the main loop
	while (GetState() == NWT_running) {
		//
		// new request?
		Lock();
		if (req_new == 1) {
			BuildAndSendReadReq(buffer, BUFFER_SIZE);
			req_new = 0;
		}
		UnLock();

		//
		// check for new data
		i = tcp.IsData(10);
		if (i < 0) {
			SetState(NWT_error);
			break;
		}
		else if (i == 0) continue;

		//
		// we got some data
		Lock();
		printf ("read data\n");
		len = tcp.Read(buffer, BUFFER_SIZE);
		if (len < 0) state = NWT_close;
		else {
			//
			// we could get some data, if busy reset connection
			if (req_mbh.fc == 0) {
				// got data without request? - Protokol error
				errno = EPROTO;
				state = NWT_error;
				break;
			}

			//
			// return data
			if ((pos = modbustcp_unpkt_headerres(&in_mbh, buffer, len)) == NULL) {
				printf ("%s:%d error on reading modbus header (%s)\n", __FILE__, __LINE__, strerror(errno));
				errno = EPROTO;
				GuiSendStatustext(strerror(errno));
			}
			//
			// process data is valid
			if ((in_mbh.fc == 1 || in_mbh.fc == 2) &&
					(in_mbh.fc == req_mbh.fc &&
					in_mbh.number == (((req_mbh.number-1) / 8)+1) &&
					in_mbh.transid == req_mbh.transid)) {
				GuiSendResult(buffer, len, &req_mbh);
				req_mbh.fc = 0;
			}
			else if ((in_mbh.fc == 3 || in_mbh.fc == 4) &&
					(in_mbh.fc == req_mbh.fc &&
					in_mbh.number/2 == req_mbh.number &&
					in_mbh.transid == req_mbh.transid)) {
				GuiSendResult(buffer, len, &req_mbh);
				req_mbh.fc = 0;
			}
			else {
				printf ("%s:%d incorrect data:   fc: %d == %d  number: %d == %d(%d)   transid: %d == %d\n", __FILE__, __LINE__,
						in_mbh.fc, req_mbh.fc, in_mbh.number, (((req_mbh.number-1) / 8)+1), req_mbh.number, in_mbh.transid, req_mbh.transid);
				errno = EPROTO;
				GuiSendStatustext(strerror(errno));
			}
			req_mbh.fc = 0;
		}
		UnLock();
	}

	//
	// main loop stopped, clean up
	i = GetState();
	switch (i) {
	case NWT_error:
		GuiSendStatustext(strerror(errno));
		tcp.Close();
		break;
	case NWT_close:
		GuiSendStatustext((char*)"Connection Closed");
		tcp.Close();
		break;
	default:
		GuiSendStatustext((char*)"Unknown Error");
		tcp.Close();
		break;
	}

	SetState(NWT_nothing);
	printf ("%s:%d NetworkThread::Thread Finished\n", __FILE__, __LINE__);
};