/********************************************************************\
  * BitlBee -- An IRC to other IM-networks gateway                     *
  *                                                                    *
  * Copyright 2002-2012 Wilmer van der Gaast and others                *
  \********************************************************************/

/*
 * nogaim
 *
 * Gaim without gaim - for BitlBee
 *
 * This file contains functions called by the Gaim IM-modules. It's written
 * from scratch for BitlBee and doesn't contain any code from Gaim anymore
 * (except for the function names).
 */

/*
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License with
  the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
  if not, write to the Free Software Foundation, Inc., 51 Franklin St.,
  Fifth Floor, Boston, MA  02110-1301  USA
*/

#define BITLBEE_CORE
#include <ctype.h>

#include "nogaim.h"

GSList *connections;

#ifdef WITH_PLUGINS
gboolean load_plugin(char *path)
{
	void (*init_function) (void);
	
	GModule *mod = g_module_open(path, G_MODULE_BIND_LAZY);

	if(!mod) {
		log_message(LOGLVL_ERROR, "Can't find `%s', not loading (%s)\n", path, g_module_error());
		return FALSE;
	}

	if(!g_module_symbol(mod,"init_plugin",(gpointer *) &init_function)) {
		log_message(LOGLVL_WARNING, "Can't find function `init_plugin' in `%s'\n", path);
		return FALSE;
	}

	init_function();

	return TRUE;
}

void load_plugins(void)
{
	GDir *dir;
	GError *error = NULL;

	dir = g_dir_open(global.conf->plugindir, 0, &error);

	if (dir) {
		const gchar *entry;
		char *path;

		while ((entry = g_dir_read_name(dir))) {
			path = g_build_filename(global.conf->plugindir, entry, NULL);
			if(!path) {
				log_message(LOGLVL_WARNING, "Can't build path for %s\n", entry);
				continue;
			}

			load_plugin(path);

			g_free(path);
		}

		g_dir_close(dir);
	}
}
#endif

GList *protocols = NULL;
  
void register_protocol (struct prpl *p)
{
	int i;
	gboolean refused = global.conf->protocols != NULL;
 
	for (i = 0; global.conf->protocols && global.conf->protocols[i]; i++)
 	{
 		if (g_strcasecmp(p->name, global.conf->protocols[i]) == 0)
			refused = FALSE;
 	}

	if (refused)
		log_message(LOGLVL_WARNING, "Protocol %s disabled\n", p->name);
	else
		protocols = g_list_append(protocols, p);
}

struct prpl *find_protocol(const char *name)
{
	GList *gl;
	
	for( gl = protocols; gl; gl = gl->next )
 	{
 		struct prpl *proto = gl->data;
 		
 		if( g_strcasecmp( proto->name, name ) == 0 )
			return proto;
 	}
 	
 	return NULL;
}

void nogaim_init()
{
	extern void msn_initmodule();
	extern void oscar_initmodule();
	extern void byahoo_initmodule();
	extern void jabber_initmodule();
	extern void twitter_initmodule();
	extern void purple_initmodule();

#ifdef WITH_MSN
	msn_initmodule();
#endif

#ifdef WITH_OSCAR
	oscar_initmodule();
#endif
	
#ifdef WITH_YAHOO
	byahoo_initmodule();
#endif
	
#ifdef WITH_JABBER
	jabber_initmodule();
#endif

#ifdef WITH_TWITTER
	twitter_initmodule();
#endif

#ifdef WITH_PURPLE
	purple_initmodule();
#endif

#ifdef WITH_PLUGINS
	load_plugins();
#endif
}

GSList *get_connections() { return connections; }

struct im_connection *imcb_new( account_t *acc )
{
	struct im_connection *ic;
	
	ic = g_new0( struct im_connection, 1 );
	
	ic->bee = acc->bee;
	ic->acc = acc;
	acc->ic = ic;
	
	connections = g_slist_append( connections, ic );
	
	return( ic );
}

void imc_free( struct im_connection *ic )
{
	account_t *a;
	
	/* Destroy the pointer to this connection from the account list */
	for( a = ic->bee->accounts; a; a = a->next )
		if( a->ic == ic )
		{
			a->ic = NULL;
			break;
		}
	
	connections = g_slist_remove( connections, ic );
	g_free( ic );
}

static void serv_got_crap( struct im_connection *ic, char *format, ... )
{
	va_list params;
	char *text;
	account_t *a;
	
	va_start( params, format );
	text = g_strdup_vprintf( format, params );
	va_end( params );

	if( ( g_strcasecmp( set_getstr( &ic->bee->set, "strip_html" ), "always" ) == 0 ) ||
	    ( ( ic->flags & OPT_DOES_HTML ) && set_getbool( &ic->bee->set, "strip_html" ) ) )
		strip_html( text );
	
	/* Try to find a different connection on the same protocol. */
	for( a = ic->bee->accounts; a; a = a->next )
		if( a->prpl == ic->acc->prpl && a->ic != ic )
			break;
	
	/* If we found one, include the screenname in the message. */
	if( a )
		/* FIXME(wilmer): ui_log callback or so */
		irc_rootmsg( ic->bee->ui_data, "%s - %s", ic->acc->tag, text );
	else
		irc_rootmsg( ic->bee->ui_data, "%s - %s", ic->acc->prpl->name, text );
	
	g_free( text );
}

void imcb_log( struct im_connection *ic, char *format, ... )
{
	va_list params;
	char *text;
	
	va_start( params, format );
	text = g_strdup_vprintf( format, params );
	va_end( params );
	
	if( ic->flags & OPT_LOGGED_IN )
		serv_got_crap( ic, "%s", text );
	else
		serv_got_crap( ic, "Logging in: %s", text );
	
	g_free( text );
}

void imcb_error( struct im_connection *ic, char *format, ... )
{
	va_list params;
	char *text;
	
	va_start( params, format );
	text = g_strdup_vprintf( format, params );
	va_end( params );
	
	if( ic->flags & OPT_LOGGED_IN )
		serv_got_crap( ic, "Error: %s", text );
	else
		serv_got_crap( ic, "Login error: %s", text );
	
	g_free( text );
}

static gboolean send_keepalive( gpointer d, gint fd, b_input_condition cond )
{
	struct im_connection *ic = d;
	
	if( ( ic->flags & OPT_PONGS ) && !( ic->flags & OPT_PONGED ) )
	{
		/* This protocol is expected to ack keepalives and hasn't
		   since the last time we were here. */
		imcb_error( ic, "Connection timeout" );
		imc_logout( ic, TRUE );
		return FALSE;
	}
	ic->flags &= ~OPT_PONGED;
	
	if( ic->acc->prpl->keepalive )
		ic->acc->prpl->keepalive( ic );
	
	return TRUE;
}

void start_keepalives( struct im_connection *ic, int interval )
{
	b_event_remove( ic->keepalive );
	ic->keepalive = b_timeout_add( interval, send_keepalive, ic );
	
	/* Connecting successfully counts as a first successful pong. */
	if( ic->flags & OPT_PONGS )
		ic->flags |= OPT_PONGED;
}

void imcb_connected( struct im_connection *ic )
{
	/* MSN servers sometimes redirect you to a different server and do
	   the whole login sequence again, so these "late" calls to this
	   function should be handled correctly. (IOW, ignored) */
	if( ic->flags & OPT_LOGGED_IN )
		return;
	
	imcb_log( ic, "Logged in" );
	
	ic->flags |= OPT_LOGGED_IN;
	start_keepalives( ic, 60000 );
	
	/* Necessary to send initial presence status, even if we're not away. */
	imc_away_send_update( ic );
	
	/* Apparently we're connected successfully, so reset the
	   exponential backoff timer. */
	ic->acc->auto_reconnect_delay = 0;
	
	if( ic->bee->ui->imc_connected )
		ic->bee->ui->imc_connected( ic );
}

gboolean auto_reconnect( gpointer data, gint fd, b_input_condition cond )
{
	account_t *a = data;
	
	a->reconnect = 0;
	account_on( a->bee, a );
	
	return( FALSE );	/* Only have to run the timeout once */
}

void cancel_auto_reconnect( account_t *a )
{
	b_event_remove( a->reconnect );
	a->reconnect = 0;
}

void imc_logout( struct im_connection *ic, int allow_reconnect )
{
	bee_t *bee = ic->bee;
	account_t *a;
	GSList *l;
	int delay;
	
	/* Nested calls might happen sometimes, this is probably the best
	   place to catch them. */
	if( ic->flags & OPT_LOGGING_OUT )
		return;
	else
		ic->flags |= OPT_LOGGING_OUT;
	
	if( ic->bee->ui->imc_disconnected )
		ic->bee->ui->imc_disconnected( ic );
	
	imcb_log( ic, "Signing off.." );
	
	/* TBH I don't remember anymore why I didn't just use ic->acc... */
	for( a = bee->accounts; a; a = a->next )
		if( a->ic == ic )
			break;
	
	if( a && !allow_reconnect && !( ic->flags & OPT_LOGGED_IN ) &&
	    set_getbool( &a->set, "oauth" ) )
	{
		/* If this account supports OAuth, we're not logged in yet and
		   not allowed to retry, assume there were auth issues. Give a
		   helpful message on what might be necessary to fix this. */
		imcb_log( ic, "If you're having problems logging in, try re-requesting "
		          "an OAuth token: account %s set password \"\"", a->tag );
	}
	
	for( l = bee->users; l; )
	{
		bee_user_t *bu = l->data;
		GSList *next = l->next;
		
		if( bu->ic == ic )
			bee_user_free( bee, bu );
		
		l = next;
	}
	
	b_event_remove( ic->keepalive );
	ic->keepalive = 0;
	ic->acc->prpl->logout( ic );
	b_event_remove( ic->inpa );
	
	g_free( ic->away );
	ic->away = NULL;
	
	query_del_by_conn( (irc_t*) ic->bee->ui_data, ic );
	
	if( !a )
	{
		/* Uhm... This is very sick. */
	}
	else if( allow_reconnect && set_getbool( &bee->set, "auto_reconnect" ) &&
	         set_getbool( &a->set, "auto_reconnect" ) &&
	         ( delay = account_reconnect_delay( a ) ) > 0 )
	{
		imcb_log( ic, "Reconnecting in %d seconds..", delay );
		a->reconnect = b_timeout_add( delay * 1000, auto_reconnect, a );
	}
	
	imc_free( ic );
}

void imcb_ask( struct im_connection *ic, char *msg, void *data,
               query_callback doit, query_callback dont )
{
	query_add( (irc_t *) ic->bee->ui_data, ic, msg, doit, dont, g_free, data );
}

void imcb_ask_with_free( struct im_connection *ic, char *msg, void *data,
                         query_callback doit, query_callback dont, query_callback myfree )
{
	query_add( (irc_t *) ic->bee->ui_data, ic, msg, doit, dont, myfree, data );
}

void imcb_add_buddy( struct im_connection *ic, const char *handle, const char *group )
{
	bee_user_t *bu;
	bee_t *bee = ic->bee;
	bee_group_t *oldg;
	
	if( !( bu = bee_user_by_handle( bee, ic, handle ) ) )
		bu = bee_user_new( bee, ic, handle, 0 );
	
	oldg = bu->group;
	bu->group = bee_group_by_name( bee, group, TRUE );
	
	if( bee->ui->user_group && bu->group != oldg )
		bee->ui->user_group( bee, bu );
}

void imcb_rename_buddy( struct im_connection *ic, const char *handle, const char *fullname )
{
	bee_t *bee = ic->bee;
	bee_user_t *bu = bee_user_by_handle( bee, ic, handle );
	
	if( !bu || !fullname ) return;
	
	if( !bu->fullname || strcmp( bu->fullname, fullname ) != 0 )
	{
		g_free( bu->fullname );
		bu->fullname = g_strdup( fullname );
		
		if( bee->ui->user_fullname )
			bee->ui->user_fullname( bee, bu );
	}
}

void imcb_remove_buddy( struct im_connection *ic, const char *handle, char *group )
{
	bee_user_free( ic->bee, bee_user_by_handle( ic->bee, ic, handle ) );
}

/* Mainly meant for ICQ (and now also for Jabber conferences) to allow IM
   modules to suggest a nickname for a handle. */
void imcb_buddy_nick_hint( struct im_connection *ic, const char *handle, const char *nick )
{
	bee_t *bee = ic->bee;
	bee_user_t *bu = bee_user_by_handle( bee, ic, handle );
	
	if( !bu || !nick ) return;
	
	g_free( bu->nick );
	bu->nick = g_strdup( nick );
	
	if( bee->ui->user_nick_hint )
		bee->ui->user_nick_hint( bee, bu, nick );
}


struct imcb_ask_cb_data
{
	struct im_connection *ic;
	char *handle;
};

static void imcb_ask_auth_cb_no( void *data )
{
	struct imcb_ask_cb_data *cbd = data;
	
	cbd->ic->acc->prpl->auth_deny( cbd->ic, cbd->handle );
	
	g_free( cbd->handle );
	g_free( cbd );
}

static void imcb_ask_auth_cb_yes( void *data )
{
	struct imcb_ask_cb_data *cbd = data;
	
	cbd->ic->acc->prpl->auth_allow( cbd->ic, cbd->handle );
	
	g_free( cbd->handle );
	g_free( cbd );
}

void imcb_ask_auth( struct im_connection *ic, const char *handle, const char *realname )
{
	struct imcb_ask_cb_data *data = g_new0( struct imcb_ask_cb_data, 1 );
	char *s, *realname_ = NULL;
	
	if( realname != NULL )
		realname_ = g_strdup_printf( " (%s)", realname );
	
	s = g_strdup_printf( "The user %s%s wants to add you to his/her buddy list.",
	                     handle, realname_ ? realname_ : "" );
	
	g_free( realname_ );
	
	data->ic = ic;
	data->handle = g_strdup( handle );
	query_add( (irc_t *) ic->bee->ui_data, ic, s,
	           imcb_ask_auth_cb_yes, imcb_ask_auth_cb_no, g_free, data );
}


static void imcb_ask_add_cb_no( void *data )
{
	g_free( ((struct imcb_ask_cb_data*)data)->handle );
	g_free( data );
}

static void imcb_ask_add_cb_yes( void *data )
{
	struct imcb_ask_cb_data *cbd = data;
	
	cbd->ic->acc->prpl->add_buddy( cbd->ic, cbd->handle, NULL );
	
	imcb_ask_add_cb_no( data );
}

void imcb_ask_add( struct im_connection *ic, const char *handle, const char *realname )
{
	struct imcb_ask_cb_data *data = g_new0( struct imcb_ask_cb_data, 1 );
	char *s;
	
	/* TODO: Make a setting for this! */
	if( bee_user_by_handle( ic->bee, ic, handle ) != NULL )
		return;
	
	s = g_strdup_printf( "The user %s is not in your buddy list yet. Do you want to add him/her now?", handle );
	
	data->ic = ic;
	data->handle = g_strdup( handle );
	query_add( (irc_t *) ic->bee->ui_data, ic, s,
	           imcb_ask_add_cb_yes, imcb_ask_add_cb_no, g_free, data );
}

struct bee_user *imcb_buddy_by_handle( struct im_connection *ic, const char *handle )
{
	return bee_user_by_handle( ic->bee, ic, handle );
}

/* The plan is to not allow straight calls to prpl functions anymore, but do
   them all from some wrappers. We'll start to define some down here: */

int imc_chat_msg( struct groupchat *c, char *msg, int flags )
{
	char *buf = NULL;
	
	if( ( c->ic->flags & OPT_DOES_HTML ) && ( g_strncasecmp( msg, "<html>", 6 ) != 0 ) )
	{
		buf = escape_html( msg );
		msg = buf;
	}
	
	c->ic->acc->prpl->chat_msg( c, msg, flags );
	g_free( buf );
	
	return 1;
}

static char *imc_away_state_find( GList *gcm, char *away, char **message );

int imc_away_send_update( struct im_connection *ic )
{
	char *away, *msg = NULL;
	
	if( ic->acc->prpl->away_states == NULL ||
	    ic->acc->prpl->set_away == NULL )
		return 0;
	
	away = set_getstr( &ic->acc->set, "away" ) ?
	     : set_getstr( &ic->bee->set, "away" );
	if( away && *away )
	{
		GList *m = ic->acc->prpl->away_states( ic );
		msg = ic->acc->flags & ACC_FLAG_AWAY_MESSAGE ? away : NULL;
		away = imc_away_state_find( m, away, &msg ) ? : m->data;
	}
	else if( ic->acc->flags & ACC_FLAG_STATUS_MESSAGE )
	{
		away = NULL;
		msg = set_getstr( &ic->acc->set, "status" ) ?
		    : set_getstr( &ic->bee->set, "status" );
	}
	
	ic->acc->prpl->set_away( ic, away, msg );
	
	return 1;
}

static char *imc_away_alias_list[8][5] =
{
	{ "Away from computer", "Away", "Extended away", NULL },
	{ "NA", "N/A", "Not available", NULL },
	{ "Busy", "Do not disturb", "DND", "Occupied", NULL },
	{ "Be right back", "BRB", NULL },
	{ "On the phone", "Phone", "On phone", NULL },
	{ "Out to lunch", "Lunch", "Food", NULL },
	{ "Invisible", "Hidden" },
	{ NULL }
};

static char *imc_away_state_find( GList *gcm, char *away, char **message )
{
	GList *m;
	int i, j;
	
	for( m = gcm; m; m = m->next )
		if( g_strncasecmp( m->data, away, strlen( m->data ) ) == 0 )
		{
			/* At least the Yahoo! module works better if message
			   contains no data unless it adds something to what
			   we have in state already. */
			if( strlen( m->data ) == strlen( away ) )
				*message = NULL;
			
			return m->data;
		}
	
	for( i = 0; *imc_away_alias_list[i]; i ++ )
	{
		int keep_message;
		
		for( j = 0; imc_away_alias_list[i][j]; j ++ )
			if( g_strncasecmp( away, imc_away_alias_list[i][j], strlen( imc_away_alias_list[i][j] ) ) == 0 )
			{
				keep_message = strlen( away ) != strlen( imc_away_alias_list[i][j] );
				break;
			}
		
		if( !imc_away_alias_list[i][j] )	/* If we reach the end, this row */
			continue;			/* is not what we want. Next!    */
		
		/* Now find an entry in this row which exists in gcm */
		for( j = 0; imc_away_alias_list[i][j]; j ++ )
		{
			for( m = gcm; m; m = m->next )
				if( g_strcasecmp( imc_away_alias_list[i][j], m->data ) == 0 )
				{
					if( !keep_message )
						*message = NULL;
					
					return imc_away_alias_list[i][j];
				}
		}
		
		/* No need to look further, apparently this state doesn't
		   have any good alias for this protocol. */
		break;
	}
	
	return NULL;
}

void imc_add_allow( struct im_connection *ic, char *handle )
{
	if( g_slist_find_custom( ic->permit, handle, (GCompareFunc) ic->acc->prpl->handle_cmp ) == NULL )
	{
		ic->permit = g_slist_prepend( ic->permit, g_strdup( handle ) );
	}
	
	ic->acc->prpl->add_permit( ic, handle );
}

void imc_rem_allow( struct im_connection *ic, char *handle )
{
	GSList *l;
	
	if( ( l = g_slist_find_custom( ic->permit, handle, (GCompareFunc) ic->acc->prpl->handle_cmp ) ) )
	{
		g_free( l->data );
		ic->permit = g_slist_delete_link( ic->permit, l );
	}
	
	ic->acc->prpl->rem_permit( ic, handle );
}

void imc_add_block( struct im_connection *ic, char *handle )
{
	if( g_slist_find_custom( ic->deny, handle, (GCompareFunc) ic->acc->prpl->handle_cmp ) == NULL )
	{
		ic->deny = g_slist_prepend( ic->deny, g_strdup( handle ) );
	}
	
	ic->acc->prpl->add_deny( ic, handle );
}

void imc_rem_block( struct im_connection *ic, char *handle )
{
	GSList *l;
	
	if( ( l = g_slist_find_custom( ic->deny, handle, (GCompareFunc) ic->acc->prpl->handle_cmp ) ) )
	{
		g_free( l->data );
		ic->deny = g_slist_delete_link( ic->deny, l );
	}
	
	ic->acc->prpl->rem_deny( ic, handle );
}

void imcb_clean_handle( struct im_connection *ic, char *handle )
{
	/* Accepts a handle and does whatever is necessary to make it
	   BitlBee-friendly. Currently this means removing everything
	   outside 33-127 (ASCII printable excl spaces), @ (only one
	   is allowed) and ! and : */
	char out[strlen(handle)+1];
	int s, d;
	
	s = d = 0;
	while( handle[s] )
	{
		if( handle[s] > ' ' && handle[s] != '!' && handle[s] != ':' &&
		    ( handle[s] & 0x80 ) == 0 )
		{
			if( handle[s] == '@' )
			{
				/* See if we got an @ already? */
				out[d] = 0;
				if( strchr( out, '@' ) )
					continue;
			}
			
			out[d++] = handle[s];
		}
		s ++;
	}
	out[d] = handle[s];
	
	strcpy( handle, out );
}