/* 
 * Handling communication with clients.
 */

#include "moxerver.h"

/* Closes client connection. */
int client_close(struct client_t *client) {
	/* force closing in case of error */
	if (close(client->socket) == -1) {
		close(client->socket);
	}
	client->socket = -1;
	fprintf(stderr,"[%s] socket closed for client %s\n", __func__, client->ip_string);
	return 0;
}

/* Reads data from client into client data buffer. Returns number of read bytes. */
int client_read(struct client_t *client) {
	
	int len;
	
	/* read client data */
	len = recv(client->socket, client->data, sizeof(client->data)-1, 0);
	if (len == -1) {
		fprintf(stderr, "[%s:%d] error %d: %s\n", __func__, __LINE__, errno, strerror(errno));
		return -errno;
	}
	/* a disconnected client socket is ready for reading but read returns 0 */
	if (len == 0) {
		fprintf(stderr, "[%s:%d] no data available from client\n", __func__, __LINE__);
		return -ENODATA;
	}
	
	//TODO let's print received bytes during development phase...
	{
		int i;
		for(i = 0; i < len; i++) {
			fprintf(stderr, "client %s <- %u '%c'\n",
					client->ip_string,
					(unsigned char) client->data[i],
					(unsigned char) client->data[i]);
		}	
	}
	
	/* handle special telnet characters coming from client */
	telnet_handle_client_read(client->data, &len);
	
	return len;
}

/* Sends data from a buffer to client. Returns number of sent bytes. */
int client_write(struct client_t *client, char *databuf, int datalen) {
	
	int len;
	
	/* handle special telnet characters to display them correctly on client */
	//telnet_handle_client_write(databuf, &datalen);
	
	//TODO let's print received bytes during development phase...
	{
		int i;
		for(i = 0; i < datalen; i++) {
			fprintf(stderr, "client %s -> %u '%c'\n",
					client->ip_string,
					(unsigned char) databuf[i],
					(unsigned char) databuf[i]);
		}	
	}
	
	/* send data to client */
	len = send(client->socket, databuf, datalen, 0);
	if (len == -1) {
		fprintf(stderr, "[%s:%d] error %d: %s\n", __func__, __LINE__, errno, strerror(errno));
		return -errno;
	}
	
	return len;
}