/*
 * Copyright (C) 2004-2009 Georgy Yunaev gyunaev@ulduzsoft.com
 *
 * This example is free, and not covered by LGPL license. There is no 
 * restriction applied to their modification, redistribution, using and so on.
 * You can study them, modify them, use them in your own program - either 
 * completely or partially. By using it you may give me some credits in your
 * program, but you don't have to.
 *
 *
 * This example tests most features of libirc. It can join the specific
 * channel, welcoming all the people there, and react on some messages -
 * 'help', 'quit', 'dcc chat', 'dcc send', 'ctcp'. Also it can reply to 
 * CTCP requests, receive DCC files and accept DCC chats.
 *
 * Features used:
 * - nickname parsing;
 * - handling 'channel' event to track the messages;
 * - handling dcc and ctcp events;
 * - using internal ctcp rely procedure;
 * - generating channel messages;
 * - handling dcc send and dcc chat events;
 * - initiating dcc send and dcc chat.
 *
 * $Id: irctest.c 124 2013-11-28 05:44:10Z gyunaev $
 */

#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <stdlib.h>

#include "libircclient.h"


/*
 * We store data in IRC session context.
 */
typedef struct
{
	char 	* channel;
	char 	* nick;

} irc_ctx_t;


void addlog (const char * fmt, ...)
{
	FILE * fp;
	char buf[1024];
	va_list va_alist;

	va_start (va_alist, fmt);
#if defined (_WIN32)
	_vsnprintf (buf, sizeof(buf), fmt, va_alist);
#else
	vsnprintf (buf, sizeof(buf), fmt, va_alist);
#endif
	va_end (va_alist);

	printf ("%s\n", buf);

	if ( (fp = fopen ("irctest.log", "ab")) != 0 )
	{
		fprintf (fp, "%s\n", buf);
		fclose (fp);
	}
}


void dump_event (irc_session_t * session, const char * event, const char * origin, const char ** params, unsigned int count)
{
	char buf[512];
	int cnt;

	buf[0] = '\0';

	for ( cnt = 0; cnt < count; cnt++ )
	{
		if ( cnt )
			strcat (buf, "|");

		strcat (buf, params[cnt]);
	}


	addlog ("Event \"%s\", origin: \"%s\", params: %d [%s]", event, origin ? origin : "NULL", cnt, buf);
}


void event_join (irc_session_t * session, const char * event, const char * origin, const char ** params, unsigned int count)
{
	dump_event (session, event, origin, params, count);
	irc_cmd_user_mode (session, "+i");
	irc_cmd_msg (session, params[0], "Hi all");
}


void event_connect (irc_session_t * session, const char * event, const char * origin, const char ** params, unsigned int count)
{
	irc_ctx_t * ctx = (irc_ctx_t *) irc_get_ctx (session);
	dump_event (session, event, origin, params, count);

	irc_cmd_join (session, ctx->channel, 0);
}


void event_privmsg (irc_session_t * session, const char * event, const char * origin, const char ** params, unsigned int count)
{
	dump_event (session, event, origin, params, count);

	printf ("'%s' said me (%s): %s\n", 
		origin ? origin : "someone",
		params[0], params[1] );
}


void dcc_recv_callback (irc_session_t * session, irc_dcc_t id, int status, void * ctx, const char * data, unsigned int length)
{
	static int count = 1;
	char buf[12];

	switch (status)
	{
	case LIBIRC_ERR_CLOSED:
		printf ("DCC %d: chat closed\n", id);
		break;

	case 0:
		if ( !data )
		{
			printf ("DCC %d: chat connected\n", id);
			irc_dcc_msg	(session, id, "Hehe");
		}
		else 
		{
			printf ("DCC %d: %s\n", id, data);
			sprintf (buf, "DCC [%d]: %d", id, count++);
			irc_dcc_msg	(session, id, buf);
		}
		break;

	default:
		printf ("DCC %d: error %s\n", id, irc_strerror(status));
		break;
	}
}


void dcc_file_recv_callback (irc_session_t * session, irc_dcc_t id, int status, void * ctx, const char * data, unsigned int length)
{
	if ( status == 0 && length == 0 )
	{
		printf ("File sent successfully\n");

		if ( ctx )
			fclose ((FILE*) ctx);
	}
	else if ( status )
	{
		printf ("File sent error: %d\n", status);

		if ( ctx )
			fclose ((FILE*) ctx);
	}
	else
	{
		if ( ctx )
			fwrite (data, 1, length, (FILE*) ctx);
		printf ("File sent progress: %d\n", length);
	}
}


void event_channel (irc_session_t * session, const char * event, const char * origin, const char ** params, unsigned int count)
{
	char nickbuf[128];

	if ( count != 2 )
		return;

	printf ("'%s' said in channel %s: %s\n", 
		origin ? origin : "someone",
		params[0], params[1] );

	if ( !origin )
		return;

	irc_target_get_nick (origin, nickbuf, sizeof(nickbuf));

	if ( !strcmp (params[1], "quit") )
		irc_cmd_quit (session, "of course, Master!");

	if ( !strcmp (params[1], "help") )
	{
		irc_cmd_msg (session, params[0], "quit, help, dcc chat, dcc send, ctcp");
	}

	if ( !strcmp (params[1], "ctcp") )
	{
		irc_cmd_ctcp_request (session, nickbuf, "PING 223");
		irc_cmd_ctcp_request (session, nickbuf, "FINGER");
		irc_cmd_ctcp_request (session, nickbuf, "VERSION");
		irc_cmd_ctcp_request (session, nickbuf, "TIME");
	}

	if ( !strcmp (params[1], "dcc chat") )
	{
		irc_dcc_t dccid;
		irc_dcc_chat (session, 0, nickbuf, dcc_recv_callback, &dccid);
		printf ("DCC chat ID: %d\n", dccid);
	}

	if ( !strcmp (params[1], "dcc send") )
	{
		irc_dcc_t dccid;
		irc_dcc_sendfile (session, 0, nickbuf, "irctest.c", dcc_file_recv_callback, &dccid);
		printf ("DCC send ID: %d\n", dccid);
	}

	if ( !strcmp (params[1], "topic") )
		irc_cmd_topic (session, params[0], 0);
	else if ( strstr (params[1], "topic ") == params[1] )
		irc_cmd_topic (session, params[0], params[1] + 6);

	if ( strstr (params[1], "mode ") == params[1] )
		irc_cmd_channel_mode (session, params[0], params[1] + 5);

	if ( strstr (params[1], "nick ") == params[1] )
		irc_cmd_nick (session, params[1] + 5);

	if ( strstr (params[1], "whois ") == params[1] )
		irc_cmd_whois (session, params[1] + 5);
}


void irc_event_dcc_chat (irc_session_t * session, const char * nick, const char * addr, irc_dcc_t dccid)
{
	printf ("DCC chat [%d] requested from '%s' (%s)\n", dccid, nick, addr);

	irc_dcc_accept (session, dccid, 0, dcc_recv_callback);
}


void irc_event_dcc_send (irc_session_t * session, const char * nick, const char * addr, const char * filename, unsigned long size, irc_dcc_t dccid)
{
	FILE * fp;
	printf ("DCC send [%d] requested from '%s' (%s): %s (%lu bytes)\n", dccid, nick, addr, filename, size);

	if ( (fp = fopen ("file", "wb")) == 0 )
		abort();

	irc_dcc_accept (session, dccid, fp, dcc_file_recv_callback);
}

void event_numeric (irc_session_t * session, unsigned int event, const char * origin, const char ** params, unsigned int count)
{
	char buf[24];
	sprintf (buf, "%d", event);

	dump_event (session, buf, origin, params, count);
}


int main (int argc, char **argv)
{
	irc_callbacks_t	callbacks;
	irc_ctx_t ctx;
	irc_session_t * s;
	unsigned short port = 6667;

	if ( argc != 4 )
	{
		printf ("Usage: %s <server> <nick> <channel>\n", argv[0]);
		return 1;
	}

	memset (&callbacks, 0, sizeof(callbacks));

	callbacks.event_connect = event_connect;
	callbacks.event_join = event_join;
	callbacks.event_nick = dump_event;
	callbacks.event_quit = dump_event;
	callbacks.event_part = dump_event;
	callbacks.event_mode = dump_event;
	callbacks.event_topic = dump_event;
	callbacks.event_kick = dump_event;
	callbacks.event_channel = event_channel;
	callbacks.event_privmsg = event_privmsg;
	callbacks.event_notice = dump_event;
	callbacks.event_invite = dump_event;
	callbacks.event_umode = dump_event;
	callbacks.event_ctcp_rep = dump_event;
	callbacks.event_ctcp_action = dump_event;
	callbacks.event_unknown = dump_event;
	callbacks.event_numeric = event_numeric;

	callbacks.event_dcc_chat_req = irc_event_dcc_chat;
	callbacks.event_dcc_send_req = irc_event_dcc_send;

	s = irc_create_session (&callbacks);

	if ( !s )
	{
		printf ("Could not create session\n");
		return 1;
	}

	ctx.channel = argv[3];
    ctx.nick = argv[2];

	irc_set_ctx (s, &ctx);

	// If the port number is specified in the server string, use the port 0 so it gets parsed
	if ( strchr( argv[1], ':' ) != 0 )
		port = 0;

	// To handle the "SSL certificate verify failed" from command line we allow passing ## in front 
	// of the server name, and in this case tell libircclient not to verify the cert
	if ( argv[1][0] == '#' && argv[1][1] == '#' )
	{
		// Skip the first character as libircclient needs only one # for SSL support, i.e. #irc.freenode.net
		argv[1]++;
		
		irc_option_set( s, LIBIRC_OPTION_SSL_NO_VERIFY );
	}
	
	// Initiate the IRC server connection
	if ( irc_connect (s, argv[1], port, 0, argv[2], 0, 0) )
	{
		printf ("Could not connect: %s\n", irc_strerror (irc_errno(s)));
		return 1;
	}

	// and run into forever loop, generating events
	if ( irc_run (s) )
	{
		printf ("Could not connect or I/O error: %s\n", irc_strerror (irc_errno(s)));
		return 1;
	}

	return 1;
}