// Copyright (c) Athena Dev Teams - Licensed under GNU GPL
// For more information, see LICENCE in the main folder

#include "../common/cbasetypes.h"
#include "../common/malloc.h"
#include "../common/nullpo.h"
#include "../common/showmsg.h"
#include "../common/strlib.h"
#include "../common/mmo.h"
#include "map.h"
#include "atcommand.h" // msg_txt()
#include "battle.h" // struct battle_config
#include "clif.h"
#include "npc.h" // npc_event_do()
#include "pc.h"
#include "chat.h"


int chat_triggerevent(struct chat_data *cd); // forward declaration

/// Initializes a chatroom object (common functionality for both pc and npc chatrooms).
/// Returns a chatroom object on success, or NULL on failure.
static struct chat_data* chat_createchat(struct block_list* bl, const char* title, const char* pass, int limit, bool pub, int trigger, const char* ev, int zeny, int minLvl, int maxLvl)
{
	struct chat_data* cd;
	nullpo_retr(NULL, bl);

	cd = (struct chat_data *) aMalloc(sizeof(struct chat_data));

	safestrncpy(cd->title, title, sizeof(cd->title));
	safestrncpy(cd->pass, pass, sizeof(cd->pass));
	cd->pub = pub;
	cd->users = 0;
	cd->limit = min(limit, ARRAYLENGTH(cd->usersd));
	cd->trigger = trigger;
	cd->zeny = zeny;
	cd->minLvl = minLvl;
	cd->maxLvl = maxLvl;
	memset(cd->usersd, 0, sizeof(cd->usersd));
	cd->owner = bl;
	safestrncpy(cd->npc_event, ev, sizeof(cd->npc_event));

	cd->bl.id   = map_get_new_object_id();
	cd->bl.m    = bl->m;
	cd->bl.x    = bl->x;
	cd->bl.y    = bl->y;
	cd->bl.type = BL_CHAT;
	cd->bl.next = cd->bl.prev = NULL;

	if( cd->bl.id == 0 ) {
		aFree(cd);
		cd = NULL;
	}

	map_addiddb(&cd->bl);

	if( bl->type != BL_NPC )
		cd->kick_list = idb_alloc(DB_OPT_BASE);

	return cd;
}

/**
 * Player chat room creation.
 * @param sd : player requesting
 * @param title : title of chat room
 * @param pass : password for chat room
 * @param limit : amount allowed to enter
 * @param pub : public or private
 * @return 0
 */
int chat_createpcchat(struct map_session_data* sd, const char* title, const char* pass, int limit, bool pub)
{
	struct chat_data* cd;

	nullpo_ret(sd);

	if( sd->chatID )
		return 0; //Prevent people abusing the chat system by creating multiple chats, as pointed out by End of Exam. [Skotlex]

	if( sd->state.vending || sd->state.buyingstore ) // not chat, when you already have a store open
		return 0;

	if( map[sd->bl.m].flag.nochat ) {
		clif_displaymessage(sd->fd, msg_txt(sd,281));
		return 0; //Can't create chatrooms on this map.
	}

	if( map_getcell(sd->bl.m,sd->bl.x,sd->bl.y,CELL_CHKNOCHAT) ) {
		clif_displaymessage (sd->fd, msg_txt(sd,665));
		return 0;
	}

	pc_stop_walking(sd,1);

	cd = chat_createchat(&sd->bl, title, pass, limit, pub, 0, "", 0, 1, MAX_LEVEL);

	if( cd ) {
		cd->users = 1;
		cd->usersd[0] = sd;
		pc_setchatid(sd,cd->bl.id);
		pc_stop_attack(sd);
		clif_createchat(sd,0);
		clif_dispchat(cd,0);
	} else
		clif_createchat(sd,1);

	return 0;
}

 /**
 * Join an existing chat room.
 * @param sd : player requesting
 * @param chatid : ID of the chat room
 * @param pass : password of chat room
 * @return 0
 */
int chat_joinchat(struct map_session_data* sd, int chatid, const char* pass)
{
	struct chat_data* cd;

	nullpo_ret(sd);

	cd = (struct chat_data*)map_id2bl(chatid);

	if( cd == NULL || cd->bl.type != BL_CHAT || cd->bl.m != sd->bl.m || sd->state.vending || sd->state.buyingstore || sd->chatID || ((cd->owner->type == BL_NPC) ? cd->users+1 : cd->users) >= cd->limit ) {
		clif_joinchatfail(sd,0);
		return 0;
	}

	if( !cd->pub && strncmp(pass, cd->pass, sizeof(cd->pass)) != 0 && !pc_has_permission(sd, PC_PERM_JOIN_ALL_CHAT) ) {
		clif_joinchatfail(sd,1);
		return 0;
	}

	if( sd->status.base_level < cd->minLvl || sd->status.base_level > cd->maxLvl ) {
		if(sd->status.base_level < cd->minLvl)
			clif_joinchatfail(sd,5);
		else
			clif_joinchatfail(sd,6);

		return 0;
	}

	if( sd->status.zeny < cd->zeny ) {
		clif_joinchatfail(sd,4);
		return 0;
	}

	if( cd->owner->type != BL_NPC && idb_exists(cd->kick_list,sd->status.char_id) ) {
		clif_joinchatfail(sd,2);//You have been kicked out of the room.
		return 0;
	}

	pc_stop_walking(sd,1);
	cd->usersd[cd->users] = sd;
	cd->users++;

	pc_setchatid(sd,cd->bl.id);

	clif_joinchatok(sd, cd); //To the person who newly joined the list of all
	clif_addchat(cd, sd); //Reports To the person who already in the chat
	clif_dispchat(cd, 0); //Reported number of changes to the people around

	chat_triggerevent(cd); //Event

	return 0;
}

/**
 * Make player (sd) leave a chat room.
 * @param sd : player requesting
 * @param kicked : for clif notification, kicked=1 or regular leave
 * @return 0:success, 1:failed
 */
int chat_leavechat(struct map_session_data* sd, bool kicked)
{
	struct chat_data* cd;
	int i;
	int leavechar;

	nullpo_retr(1, sd);

	cd = (struct chat_data*)map_id2bl(sd->chatID);

	if( cd == NULL ) {
		pc_setchatid(sd, 0);
		return 1;
	}

	ARR_FIND( 0, cd->users, i, cd->usersd[i] == sd );
	if ( i == cd->users ) { // Not found in the chatroom?
		pc_setchatid(sd, 0);
		return -1;
	}

	clif_leavechat(cd, sd, kicked);
	pc_setchatid(sd, 0);
	cd->users--;

	leavechar = i;

	for( i = leavechar; i < cd->users; i++ )
		cd->usersd[i] = cd->usersd[i+1];

	if( cd->users == 0 && cd->owner->type == BL_PC ) { // Delete empty chatroom
		struct skill_unit* unit;
		struct skill_unit_group* group;

		clif_clearchat(cd, 0);
		db_destroy(cd->kick_list);
		map_deliddb(&cd->bl);
		map_delblock(&cd->bl);
		map_freeblock(&cd->bl);

		unit = map_find_skill_unit_oncell(&sd->bl, sd->bl.x, sd->bl.y, AL_WARP, NULL, 0);
		group = (unit != NULL) ? unit->group : NULL;

		if (group != NULL)
			ext_skill_unit_onplace(unit, &sd->bl, group->tick);

		return 1;
	}

	if( leavechar == 0 && cd->owner->type == BL_PC ) { // Set and announce new owner
		cd->owner = (struct block_list*) cd->usersd[0];
		clif_changechatowner(cd, cd->usersd[0]);
		clif_clearchat(cd, 0);

		//Adjust Chat location after owner has been changed.
		map_delblock( &cd->bl );
		cd->bl.x = cd->usersd[0]->bl.x;
		cd->bl.y = cd->usersd[0]->bl.y;

		if(map_addblock( &cd->bl ))
			return 1;

		clif_dispchat(cd,0);
	} else
		clif_dispchat(cd,0); // refresh chatroom

	return 0;
}

/**
 * Change a chat room's owner.
 * @param sd : player requesting
 * @param nextownername : string of new owner (name should be in chatroom)
 * @return 0:success, 1:failure
 */
int chat_changechatowner(struct map_session_data* sd, const char* nextownername)
{
	struct chat_data* cd;
	struct map_session_data* tmpsd;
	int i;

	nullpo_retr(1, sd);

	cd = (struct chat_data*)map_id2bl(sd->chatID);

	if( cd == NULL || (struct block_list*) sd != cd->owner )
		return 1;

	ARR_FIND( 1, cd->users, i, strncmp(cd->usersd[i]->status.name, nextownername, NAME_LENGTH) == 0 );
	if( i == cd->users )
		return -1;  // name not found

	// erase temporarily
	clif_clearchat(cd,0);

	// set new owner
	cd->owner = (struct block_list*) cd->usersd[i];
	clif_changechatowner(cd,cd->usersd[i]);

	// swap the old and new owners' positions
	tmpsd = cd->usersd[i];
	cd->usersd[i] = cd->usersd[0];
	cd->usersd[0] = tmpsd;

	// set the new chatroom position
	map_delblock( &cd->bl );
	cd->bl.x = cd->owner->x;
	cd->bl.y = cd->owner->y;

	if(map_addblock( &cd->bl ))
		return 1;

	// and display again
	clif_dispchat(cd,0);

	return 0;
}

/**
 * Change a chat room's status (title, etc).
 * @param sd : player requesting
 * @param title : new title
 * @param pass : new password
 * @param limit : new limit
 * @param pub : public or private
 * @return 1:success, 0:failure
 */
int chat_changechatstatus(struct map_session_data* sd, const char* title, const char* pass, int limit, bool pub)
{
	struct chat_data* cd;

	nullpo_retr(1, sd);

	cd = (struct chat_data*)map_id2bl(sd->chatID);

	if( cd == NULL || (struct block_list *)sd != cd->owner )
		return 1;

	safestrncpy(cd->title, title, CHATROOM_TITLE_SIZE);
	safestrncpy(cd->pass, pass, CHATROOM_PASS_SIZE);
	cd->limit = min(limit, ARRAYLENGTH(cd->usersd));
	cd->pub = pub;

	clif_changechatstatus(cd);
	clif_dispchat(cd,0);

	return 0;
}

/**
 * Kick a member from a chat room.
 * @param sd : player requesting
 * @param kickusername : player name to be kicked
 * @retur 1:success, 0:failure
 */
int chat_kickchat(struct map_session_data* sd, const char* kickusername)
{
	struct chat_data* cd;
	int i;

	nullpo_retr(1, sd);

	cd = (struct chat_data *)map_id2bl(sd->chatID);

	if( cd == NULL || (struct block_list *)sd != cd->owner )
		return -1;

	ARR_FIND( 0, cd->users, i, strncmp(cd->usersd[i]->status.name, kickusername, NAME_LENGTH) == 0 );
	if( i == cd->users )
		return -1;

	if (pc_has_permission(cd->usersd[i], PC_PERM_NO_CHAT_KICK))
		return 0; //gm kick protection [Valaris]

	idb_put(cd->kick_list,cd->usersd[i]->status.char_id,(void*)1);

	chat_leavechat(cd->usersd[i],1);

	return 0;
}

/**
 * Creates a chat room for a NPC.
 * @param nd : NPC requesting
 * @param title : title of chat room
 * @param limit : limit of users in chat room
 * @param pub : public or private
 * @param trigger : event trigger
 * @param ev : event name
 * @param zeny : zeny cost
 * @param minLvl : minimum level to enter
 * @param maxLvl : maximum level to enter
 * @return 0
 */
int chat_createnpcchat(struct npc_data* nd, const char* title, int limit, bool pub, int trigger, const char* ev, int zeny, int minLvl, int maxLvl)
{
	struct chat_data* cd;

	nullpo_ret(nd);

	if( nd->chat_id ) {
		ShowError("chat_createnpcchat: npc '%s' already has a chatroom, cannot create new one!\n", nd->exname);
		return 0;
	}

	if( zeny > MAX_ZENY || maxLvl > MAX_LEVEL ) {
		ShowError("chat_createnpcchat: npc '%s' has a required lvl or amount of zeny over the max limit!\n", nd->exname);
		return 0;
	}

	cd = chat_createchat(&nd->bl, title, "", limit, pub, trigger, ev, zeny, minLvl, maxLvl);

	if( cd ) {
		nd->chat_id = cd->bl.id;
		clif_dispchat(cd,0);
	}

	return 0;
}

/**
 * Removes a chat room for a NPC.
 * @param nd : NPC requesting
 */
int chat_deletenpcchat(struct npc_data* nd)
{
	struct chat_data *cd;

	nullpo_ret(nd);

	cd = (struct chat_data*)map_id2bl(nd->chat_id);

	if( cd == NULL )
		return 0;

	chat_npckickall(cd);
	clif_clearchat(cd, 0);
	map_deliddb(&cd->bl);
	map_delblock(&cd->bl);
	map_freeblock(&cd->bl);
	nd->chat_id = 0;

	return 0;
}

 /**
 * Trigger NPC event when entering the chat room.
 * @param cd : chat room to trigger event
 * @return 0
 */
int chat_triggerevent(struct chat_data *cd)
{
	nullpo_ret(cd);

	if( cd->users >= cd->trigger && cd->npc_event[0] )
		npc_event_do(cd->npc_event);

	return 0;
}

 /**
 * Enables the event of the chat room.
 * At most, 127 users are needed to trigger the event.
 * @param cd : chat room to trigger event
 */
int chat_enableevent(struct chat_data* cd)
{
	nullpo_ret(cd);

	cd->trigger &= 0x7f;
	chat_triggerevent(cd);

	return 0;
}

/**
 * Disables the event of the chat room.
 * @param cd : chat room to trigger event
 */
int chat_disableevent(struct chat_data* cd)
{
	nullpo_ret(cd);

	cd->trigger |= 0x80;

	return 0;
}

/**
 * Kicks all the users from the chat room.
 * @param cd : chat room to trigger event
 */
int chat_npckickall(struct chat_data* cd)
{
	nullpo_ret(cd);

	while( cd->users > 0 )
		chat_leavechat(cd->usersd[cd->users-1],0);

	return 0;
}