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// Copyright (c) Hercules Dev Team, licensed under GNU GPL.
// See the LICENSE file

#define HERCULES_CORE

#include "channel.h"

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

#include "atcommand.h"
#include "guild.h"
#include "instance.h"
#include "irc-bot.h"
#include "map.h"
#include "pc.h"
#include "../common/cbasetypes.h"
#include "../common/conf.h"
#include "../common/db.h"
#include "../common/malloc.h"
#include "../common/nullpo.h"
#include "../common/random.h"
#include "../common/showmsg.h"
#include "../common/socket.h"
#include "../common/strlib.h"
#include "../common/timer.h"
#include "../common/utils.h"

struct channel_interface channel_s;

static struct Channel_Config channel_config;

/**
 * Creates a chat channel.
 *
 * If the channel type isn't HCS_TYPE_MAP or HCS_TYPE_ALLY, the channel is added to the channel->db.
 *
 * @param type The channel type.
 * @param name The channel name.
 * @param color The channel chat color.
 * @return A pointer to the created channel.
 */
struct channel_data *channel_create(enum channel_types type, const char *name, unsigned char color)
{
	struct channel_data *chan;
	CREATE(chan, struct channel_data, 1);
	chan->users = idb_alloc(DB_OPT_BASE);
	if (name)
		safestrncpy(chan->name, name, HCS_NAME_LENGTH);
	chan->color = color;

	chan->options = HCS_OPT_BASE;
	chan->banned = NULL;

	chan->msg_delay = 0;

	chan->type = type;
	if (chan->type != HCS_TYPE_MAP && chan->type != HCS_TYPE_ALLY)
		strdb_put(channel->db, chan->name, chan);
	return chan;
}

/**
 * Sets a chat channel password.
 *
 * @param chan The channel to edit.
 * @param pass The password to set. Pass NULL to remove existing passwords.
 */
void channel_set_password(struct channel_data *chan, const char *password)
{
	nullpo_retv(chan);
	if (password)
		safestrncpy(chan->password, password, HCS_NAME_LENGTH);
	else
		chan->password[0] = '\0';
}

/**
 * Bans a character from the given channel.
 *
 * @param chan The channel.
 * @param ssd  The source character, if any.
 * @param tsd  The target character.
 * @retval HCS_STATUS_OK if the operation succeeded.
 * @retval HCS_STATUS_ALREADY if the target character is already banned.
 * @retval HCS_STATUS_NOPERM if the source character doesn't have enough permissions.
 * @retval HCS_STATUS_FAIL in case of generic failure.
 */
enum channel_operation_status channel_ban(struct channel_data *chan, const struct map_session_data *ssd, struct map_session_data *tsd)
{
	struct channel_ban_entry *entry = NULL;

	nullpo_retr(HCS_STATUS_FAIL, chan);
	nullpo_retr(HCS_STATUS_FAIL, tsd);

	if (ssd && chan->owner != ssd->status.char_id && !pc_has_permission(ssd, PC_PERM_HCHSYS_ADMIN))
		return HCS_STATUS_NOPERM;

	if (pc_has_permission(tsd, PC_PERM_HCHSYS_ADMIN))
		return HCS_STATUS_FAIL;

	if (chan->banned && idb_exists(chan->banned, tsd->status.account_id))
		return HCS_STATUS_ALREADY;

	if (!chan->banned)
		chan->banned = idb_alloc(DB_OPT_BASE|DB_OPT_ALLOW_NULL_DATA|DB_OPT_RELEASE_DATA);

	CREATE(entry, struct channel_ban_entry, 1);
	safestrncpy(entry->name, tsd->status.name, NAME_LENGTH);
	idb_put(chan->banned, tsd->status.account_id, entry);

	channel->leave(chan, tsd);

	return HCS_STATUS_OK;
}

/**
 * Unbans a character from the given channel.
 *
 * @param chan The channel.
 * @param ssd  The source character, if any.
 * @param tsd  The target character. If no target character is specified, all characters are unbanned.
 * @retval HCS_STATUS_OK if the operation succeeded.
 * @retval HCS_STATUS_ALREADY if the target character is not banned.
 * @retval HCS_STATUS_NOPERM if the source character doesn't have enough permissions.
 * @retval HCS_STATUS_FAIL in case of generic failure.
 */
enum channel_operation_status channel_unban(struct channel_data *chan, const struct map_session_data *ssd, struct map_session_data *tsd)
{
	nullpo_retr(HCS_STATUS_FAIL, chan);

	if (ssd && chan->owner != ssd->status.char_id && !pc_has_permission(ssd, PC_PERM_HCHSYS_ADMIN))
		return HCS_STATUS_NOPERM;

	if (!chan->banned)
		return HCS_STATUS_ALREADY;

	if (!tsd) {
		// Unban all
		db_destroy(chan->banned);
		chan->banned = NULL;
		return HCS_STATUS_OK;
	}

	// Unban one
	if (!idb_exists(chan->banned, tsd->status.account_id))
		return HCS_STATUS_ALREADY;

	idb_remove(chan->banned, tsd->status.account_id);
	if (!db_size(chan->banned)) {
		db_destroy(chan->banned);
		chan->banned = NULL;
	}

	return HCS_STATUS_OK;
}

/**
 * Sets or edits a channel's options.
 *
 * @param chan The channel.
 * @param options The new options set to apply.
 */
void channel_set_options(struct channel_data *chan, unsigned int options)
{
	nullpo_retv(chan);

	chan->options = options;
}

/**
 * Sends a message to a channel.
 *
 * @param chan The destination channel.
 * @param sd   The source character.
 * @param msg  The message to send.
 */
void channel_send(struct channel_data *chan, struct map_session_data *sd, const char *msg)
{
	nullpo_retv(chan);
	nullpo_retv(sd);

	if (chan->msg_delay != 0 && DIFF_TICK(sd->hchsysch_tick + chan->msg_delay*1000, timer->gettick()) > 0
	 && !pc_has_permission(sd, PC_PERM_HCHSYS_ADMIN)) {
		clif->colormes(sd->fd,COLOR_RED,msg_txt(1455));
		return;
	} else {
		char message[150];
		snprintf(message, 150, "[ #%s ] %s : %s",chan->name,sd->status.name, msg);
		clif->channel_msg(chan,sd,message);
		if (chan->type == HCS_TYPE_IRC)
			ircbot->relay(sd->status.name,msg);
		if (chan->msg_delay != 0)
			sd->hchsysch_tick = timer->gettick();
	}
}

void channel_join(struct channel_data *chan, struct map_session_data *sd)
{
	if (idb_put(chan->users, sd->status.char_id, sd))
		return;

	RECREATE(sd->channels, struct channel_data *, ++sd->channel_count);
	sd->channels[ sd->channel_count - 1 ] = chan;

	if (sd->stealth) {
		sd->stealth = false;
	} else if (chan->options & HCS_OPT_ANNOUNCE_JOIN) {
		char message[60];
		sprintf(message, "#%s '%s' joined",chan->name,sd->status.name);
		clif->channel_msg(chan,sd,message);
	}

	/* someone is cheating, we kindly disconnect the bastard */
	if (sd->channel_count > 200) {
		set_eof(sd->fd);
	}

}

void channel_map_join(struct map_session_data *sd)
{
	if (sd->state.autotrade || sd->state.standalone)
		return;
	if (!map->list[sd->bl.m].channel) {
		if (map->list[sd->bl.m].flag.chsysnolocalaj || (map->list[sd->bl.m].instance_id >= 0 && instance->list[map->list[sd->bl.m].instance_id].owner_type != IOT_NONE))
			return;

		map->list[sd->bl.m].channel = channel->create(HCS_TYPE_MAP, channel->config->local_name, channel->config->local_color);
		map->list[sd->bl.m].channel->m = sd->bl.m;
	}

	if (map->list[sd->bl.m].channel->banned && idb_exists(map->list[sd->bl.m].channel->banned, sd->status.account_id)) {
		return;
	}

	channel->join(map->list[sd->bl.m].channel,sd);

	if (!( map->list[sd->bl.m].channel->options & HCS_OPT_ANNOUNCE_JOIN )) {
		char mout[60];
		sprintf(mout, msg_txt(1435), channel->config->local_name, map->list[sd->bl.m].name); // You're now in the '#%s' channel for '%s'
		clif->colormes(sd->fd, COLOR_DEFAULT, mout);
	}
}

void channel_leave(struct channel_data *chan, struct map_session_data *sd)
{
	unsigned char i;

	if ( !idb_remove(chan->users,sd->status.char_id) )
		return;

	if( chan == sd->gcbind )
		sd->gcbind = NULL;

	if( !db_size(chan->users) && chan->type == HCS_TYPE_PRIVATE ) {
		channel->delete(chan);
	} else if( !channel->config->closing && (chan->options & HCS_OPT_ANNOUNCE_JOIN) ) {
		char message[60];
		sprintf(message, "#%s '%s' left",chan->name,sd->status.name);
		clif->channel_msg(chan,sd,message);
	}

	for( i = 0; i < sd->channel_count; i++ ) {
		if( sd->channels[i] == chan ) {
			sd->channels[i] = NULL;
			break;
		}
	}

	if( i < sd->channel_count ) {
		unsigned char cursor = 0;
		for( i = 0; i < sd->channel_count; i++ ) {
			if( sd->channels[i] == NULL )
				continue;
			if( cursor != i ) {
				sd->channels[cursor] = sd->channels[i];
			}
			cursor++;
		}
		if ( !(sd->channel_count = cursor) ) {
			aFree(sd->channels);
			sd->channels = NULL;
		}
	}

}

void channel_quit_guild(struct map_session_data *sd)
{
	unsigned char i;

	for( i = 0; i < sd->channel_count; i++ ) {
		struct channel_data *chan = sd->channels[i];
		if (chan != NULL && chan->type == HCS_TYPE_ALLY) {
			if (!idb_remove(chan->users,sd->status.char_id))
				continue;

			if( chan == sd->gcbind )
				sd->gcbind = NULL;

			if (!db_size(chan->users) && chan->type == HCS_TYPE_PRIVATE) {
				channel->delete(chan);
			} else if (!channel->config->closing && (chan->options & HCS_OPT_ANNOUNCE_JOIN)) {
				char message[60];
				sprintf(message, "#%s '%s' left",chan->name,sd->status.name);
				clif->channel_msg(chan,sd,message);
			}
			sd->channels[i] = NULL;
		}
	}

	if( i < sd->channel_count ) {
		unsigned char cursor = 0;
		for( i = 0; i < sd->channel_count; i++ ) {
			if( sd->channels[i] == NULL )
				continue;
			if( cursor != i ) {
				sd->channels[cursor] = sd->channels[i];
			}
			cursor++;
		}
		if ( !(sd->channel_count = cursor) ) {
			aFree(sd->channels);
			sd->channels = NULL;
		}
	}

}


void channel_quit(struct map_session_data *sd)
{
	unsigned char i;

	for (i = 0; i < sd->channel_count; i++) {
		struct channel_data *chan = sd->channels[i];
		if (chan != NULL) {
			idb_remove(chan->users,sd->status.char_id);

			if( chan == sd->gcbind )
				sd->gcbind = NULL;

			if (!db_size(chan->users) && chan->type == HCS_TYPE_PRIVATE) {
				channel->delete(chan);
			} else if (!channel->config->closing && (chan->options & HCS_OPT_ANNOUNCE_JOIN)) {
				char message[60];
				sprintf(message, "#%s '%s' left",chan->name,sd->status.name);
				clif->channel_msg(chan,sd,message);
			}

		}
	}

	sd->channel_count = 0;
	aFree(sd->channels);
	sd->channels = NULL;
}

void channel_delete(struct channel_data *chan)
{
	if (db_size(chan->users) && !channel->config->closing) {
		DBIterator *iter;
		struct map_session_data *sd;
		unsigned char i;
		iter = db_iterator(chan->users);
		for( sd = dbi_first(iter); dbi_exists(iter); sd = dbi_next(iter) ) {
			for( i = 0; i < sd->channel_count; i++ ) {
				if( sd->channels[i] == chan ) {
					sd->channels[i] = NULL;
					break;
				}
			}
			if( i < sd->channel_count ) {
				unsigned char cursor = 0;
				for( i = 0; i < sd->channel_count; i++ ) {
					if( sd->channels[i] == NULL )
						continue;
					if( cursor != i ) {
						sd->channels[cursor] = sd->channels[i];
					}
					cursor++;
				}
				if ( !(sd->channel_count = cursor) ) {
					aFree(sd->channels);
					sd->channels = NULL;
				}
			}
		}
		dbi_destroy(iter);
	}
	if( chan->banned ) {
		db_destroy(chan->banned);
		chan->banned = NULL;
	}
	db_destroy(chan->users);
	if( chan->m ) {
		map->list[chan->m].channel = NULL;
		aFree(chan);
	} else if ( chan->type == HCS_TYPE_ALLY )
		aFree(chan);
	else if (!channel->config->closing)
		strdb_remove(channel->db, chan->name);
}

void channel_guild_join(struct guild *g1,struct guild *g2)
{
	struct map_session_data *sd;
	struct channel_data *chan;
	int j;

	if( (chan = g1->channel) ) {
		for(j = 0; j < g2->max_member; j++) {
			if( (sd = g2->member[j].sd) != NULL ) {
				if( !(g1->channel->banned && idb_exists(g1->channel->banned, sd->status.account_id)))
					channel->join(chan,sd);
			}
		}
	}

	if( (chan = g2->channel) ) {
		for(j = 0; j < g1->max_member; j++) {
			if( (sd = g1->member[j].sd) != NULL ) {
				if( !(g2->channel->banned && idb_exists(g2->channel->banned, sd->status.account_id)))
				channel->join(chan,sd);
			}
		}
	}
}

void channel_guild_leave(struct guild *g1,struct guild *g2)
{
	struct map_session_data *sd;
	struct channel_data *chan;
	int j;

	if( (chan = g1->channel) ) {
		for(j = 0; j < g2->max_member; j++) {
			if( (sd = g2->member[j].sd) != NULL ) {
				channel->leave(chan,sd);
			}
		}
	}

	if( (chan = g2->channel) ) {
		for(j = 0; j < g1->max_member; j++) {
			if( (sd = g1->member[j].sd) != NULL ) {
				channel->leave(chan,sd);
			}
		}
	}
}

void read_channels_config(void)
{
	config_t channels_conf;
	config_setting_t *chsys = NULL;
	const char *config_filename = "conf/channels.conf"; // FIXME hardcoded name

	if (libconfig->read_file(&channels_conf, config_filename))
		return;

	chsys = libconfig->lookup(&channels_conf, "chsys");

	if (chsys != NULL) {
		config_setting_t *settings = libconfig->setting_get_elem(chsys, 0);
		config_setting_t *channels;
		config_setting_t *colors;
		int i,k;
		const char *local_name, *ally_name,
					*local_color, *ally_color,
					*irc_name, *irc_color;
		int ally_enabled = 0, local_enabled = 0,
			local_autojoin = 0, ally_autojoin = 0,
			allow_user_channel_creation = 0,
			irc_enabled = 0;

		if( !libconfig->setting_lookup_string(settings, "map_local_channel_name", &local_name) )
			local_name = "map";
		safestrncpy(channel->config->local_name, local_name, HCS_NAME_LENGTH);

		if( !libconfig->setting_lookup_string(settings, "ally_channel_name", &ally_name) )
			ally_name = "ally";
		safestrncpy(channel->config->ally_name, ally_name, HCS_NAME_LENGTH);

		if( !libconfig->setting_lookup_string(settings, "irc_channel_name", &irc_name) )
			irc_name = "irc";
		safestrncpy(channel->config->irc_name, irc_name, HCS_NAME_LENGTH);

		libconfig->setting_lookup_bool(settings, "map_local_channel", &local_enabled);
		libconfig->setting_lookup_bool(settings, "ally_channel_enabled", &ally_enabled);
		libconfig->setting_lookup_bool(settings, "irc_channel_enabled", &irc_enabled);

		if (local_enabled)
			channel->config->local = true;
		if (ally_enabled)
			channel->config->ally = true;
		if (irc_enabled)
			channel->config->irc = true;

		channel->config->irc_server[0] = channel->config->irc_channel[0] = channel->config->irc_nick[0] = channel->config->irc_nick_pw[0] = '\0';

		if (channel->config->irc) {
			const char *irc_server, *irc_channel,
				 *irc_nick, *irc_nick_pw;
			int irc_use_ghost = 0;
			if( libconfig->setting_lookup_string(settings, "irc_channel_network", &irc_server) ) {
				if( !strstr(irc_server,":") ) {
					channel->config->irc = false;
					ShowWarning("channels.conf : network port wasn't found in 'irc_channel_network', disabling irc channel...\n");
				} else {
					unsigned char d = 0, dlen = strlen(irc_server);
					char server[40];
					if (dlen > 39)
						dlen = 39;
					memset(server, '\0', sizeof(server));

					for(d = 0; d < dlen; d++) {
						if(irc_server[d] == ':') {
							memcpy(server, irc_server, d);
							safestrncpy(channel->config->irc_server, server, 40);
							memcpy(server, &irc_server[d+1], dlen - d - 1);
							channel->config->irc_server_port = atoi(server);
							break;
						}
					}
				}
			} else {
				channel->config->irc = false;
				ShowWarning("channels.conf : irc channel enabled but irc_channel_network wasn't found, disabling irc channel...\n");
			}
			if( libconfig->setting_lookup_string(settings, "irc_channel_channel", &irc_channel) )
				safestrncpy(channel->config->irc_channel, irc_channel, 50);
			else {
				channel->config->irc = false;
				ShowWarning("channels.conf : irc channel enabled but irc_channel_channel wasn't found, disabling irc channel...\n");
			}
			if( libconfig->setting_lookup_string(settings, "irc_channel_nick", &irc_nick) ) {
				if( strcmpi(irc_nick,"Hercules_chSysBot") == 0 ) {
					sprintf(channel->config->irc_nick, "Hercules_chSysBot%d",rnd()%777);
				} else
					safestrncpy(channel->config->irc_nick, irc_nick, 40);
			} else {
				channel->config->irc = false;
				ShowWarning("channels.conf : irc channel enabled but irc_channel_nick wasn't found, disabling irc channel...\n");
			}
			if( libconfig->setting_lookup_string(settings, "irc_channel_nick_pw", &irc_nick_pw) ) {
				safestrncpy(channel->config->irc_nick_pw, irc_nick_pw, 30);
				config_setting_lookup_bool(settings, "irc_channel_use_ghost", &irc_use_ghost);
				channel->config->irc_use_ghost = irc_use_ghost;
			}

		}

		libconfig->setting_lookup_bool(settings, "map_local_channel_autojoin", &local_autojoin);
		libconfig->setting_lookup_bool(settings, "ally_channel_autojoin", &ally_autojoin);

		if (local_autojoin)
			channel->config->local_autojoin = true;
		if (ally_autojoin)
			channel->config->ally_autojoin = true;

		libconfig->setting_lookup_bool(settings, "allow_user_channel_creation", &allow_user_channel_creation);

		if( allow_user_channel_creation )
			channel->config->allow_user_channel_creation = true;

		if( (colors = libconfig->setting_get_member(settings, "colors")) != NULL ) {
			int color_count = libconfig->setting_length(colors);
			CREATE(channel->config->colors, unsigned int, color_count);
			CREATE(channel->config->colors_name, char *, color_count);
			for(i = 0; i < color_count; i++) {
				config_setting_t *color = libconfig->setting_get_elem(colors, i);

				CREATE(channel->config->colors_name[i], char, HCS_NAME_LENGTH);

				safestrncpy(channel->config->colors_name[i], config_setting_name(color), HCS_NAME_LENGTH);

				channel->config->colors[i] = (unsigned int)strtoul(libconfig->setting_get_string_elem(colors,i),NULL,0);
				channel->config->colors[i] = (channel->config->colors[i] & 0x0000FF) << 16 | (channel->config->colors[i] & 0x00FF00) | (channel->config->colors[i] & 0xFF0000) >> 16;//RGB to BGR
			}
			channel->config->colors_count = color_count;
		}

		libconfig->setting_lookup_string(settings, "map_local_channel_color", &local_color);

		for (k = 0; k < channel->config->colors_count; k++) {
			if (strcmpi(channel->config->colors_name[k], local_color) == 0)
				break;
		}

		if (k < channel->config->colors_count) {
			channel->config->local_color = k;
		} else {
			ShowError("channels.conf: unknown color '%s' for 'map_local_channel_color', disabling '#%s'...\n",local_color,local_name);
			channel->config->local = false;
		}

		libconfig->setting_lookup_string(settings, "ally_channel_color", &ally_color);

		for (k = 0; k < channel->config->colors_count; k++) {
			if (strcmpi(channel->config->colors_name[k], ally_color) == 0)
				break;
		}

		if( k < channel->config->colors_count ) {
			channel->config->ally_color = k;
		} else {
			ShowError("channels.conf: unknown color '%s' for 'ally_channel_color', disabling '#%s'...\n",ally_color,ally_name);
			channel->config->ally = false;
		}

		libconfig->setting_lookup_string(settings, "irc_channel_color", &irc_color);

		for (k = 0; k < channel->config->colors_count; k++) {
			if (strcmpi(channel->config->colors_name[k], irc_color) == 0)
				break;
		}

		if (k < channel->config->colors_count) {
			channel->config->irc_color = k;
		} else {
			ShowError("channels.conf: unknown color '%s' for 'irc_channel_color', disabling '#%s'...\n",irc_color,irc_name);
			channel->config->irc = false;
		}

		if (channel->config->irc) {
			ircbot->channel = channel->create(HCS_TYPE_IRC, channel->config->irc_name, channel->config->irc_color);
		}

		if( (channels = libconfig->setting_get_member(settings, "default_channels")) != NULL ) {
			int channel_count = libconfig->setting_length(channels);

			for(i = 0; i < channel_count; i++) {
				config_setting_t *chan = libconfig->setting_get_elem(channels, i);
				const char *name = config_setting_name(chan);
				const char *color = libconfig->setting_get_string_elem(channels,i);

				ARR_FIND(0, channel->config->colors_count, k, strcmpi(channel->config->colors_name[k],color) == 0);
				if (k == channel->config->colors_count) {
					ShowError("channels.conf: unknown color '%s' for channel '%s', skipping channel...\n",color,name);
					continue;
				}
				if (strcmpi(name, channel->config->local_name) == 0
				 || strcmpi(name, channel->config->ally_name) == 0
				 || strcmpi(name, channel->config->irc_name) == 0
				 || strdb_exists(channel->db, name)) {
					ShowError("channels.conf: duplicate channel '%s', skipping channel...\n",name);
					continue;

				}
				channel->create(HCS_TYPE_PUBLIC, name, k);
			}
		}

		ShowStatus("Done reading '"CL_WHITE"%d"CL_RESET"' channels in '"CL_WHITE"%s"CL_RESET"'.\n", db_size(channel->db), config_filename);
		libconfig->destroy(&channels_conf);
	}
}

/*==========================================
 *
 *------------------------------------------*/
int do_init_channel(bool minimal)
{
	if (minimal)
		return 0;

	channel->db = stridb_alloc(DB_OPT_DUP_KEY|DB_OPT_RELEASE_DATA, HCS_NAME_LENGTH);
	channel->config->ally = channel->config->local = channel->config->irc = channel->config->ally_autojoin = channel->config->local_autojoin = false;
	channel->config_read();

	return 0;
}

void do_final_channel(void)
{
	DBIterator *iter = db_iterator(channel->db);
	struct channel_data *chan;
	unsigned char i;

	for( chan = dbi_first(iter); dbi_exists(iter); chan = dbi_next(iter) ) {
		channel->delete(chan);
	}

	dbi_destroy(iter);

	for(i = 0; i < channel->config->colors_count; i++) {
		aFree(channel->config->colors_name[i]);
	}

	if (channel->config->colors_count) {
		aFree(channel->config->colors_name);
		aFree(channel->config->colors);
	}

	db_destroy(channel->db);
}
void channel_defaults(void)
{
	channel = &channel_s;
	/* core */
	channel->init = do_init_channel;
	channel->final = do_final_channel;
	channel->config = &channel_config;

	channel->create = channel_create;
	channel->set_password = channel_set_password;
	channel->ban = channel_ban;
	channel->unban = channel_unban;
	channel->set_options = channel_set_options;

	channel->send = channel_send;
	channel->join = channel_join;
	channel->leave = channel_leave;
	channel->delete = channel_delete;
	channel->map_join = channel_map_join;
	channel->quit = channel_quit;
	channel->quit_guild = channel_quit_guild;
	channel->guild_join = channel_guild_join;
	channel->guild_leave = channel_guild_leave;
	channel->config_read = read_channels_config;
}