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

#include "../common/nullpo.h"
#include "../common/strlib.h"
#include "../common/utils.h"
#include "clif.h"
#include "itemdb.h"
#include "atcommand.h"
#include "map.h"
#include "path.h"
#include "chrif.h"
#include "vending.h"
#include "pc.h"
#include "skill.h"
#include "battle.h"
#include "log.h"

#include "irc.h"

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


/*==========================================
 * Close shop
 *------------------------------------------*/
void vending_closevending(struct map_session_data* sd)
{
	nullpo_retv(sd);

	sd->vender_id = 0;
	clif_closevendingboard(&sd->bl,0);

	if( use_irc && irc_announce_shop_flag )
		irc_announce_shop(sd,0);
}

/*==========================================
 * Request a shop's item list
 *------------------------------------------*/
void vending_vendinglistreq(struct map_session_data* sd, int id)
{
	struct map_session_data* vsd;

	nullpo_retv(sd);

	if( (vsd = map_id2sd(id)) == NULL )
		return;
	if( vsd->vender_id == 0 )
		return; // not vending

	clif_vendinglist(sd, id, vsd->vending);
}

/*==========================================
 * Purchase item(s) from a shop
 *------------------------------------------*/
void vending_purchasereq(struct map_session_data* sd, int id, const uint8* data, int count)
{
	int i, j, cursor, w, new_ = 0, blank, vend_list[MAX_VENDING];
	double z;
	struct s_vending vending[MAX_VENDING]; // against duplicate packets
	struct map_session_data* vsd = map_id2sd(id);

	nullpo_retv(sd);

	if( vsd == NULL || vsd->vender_id == 0 || vsd->vender_id == sd->bl.id )
		return; // invalid shop
	if( sd->bl.m != vsd->bl.m || !check_distance_bl(&sd->bl, &vsd->bl, AREA_SIZE) )
		return; // shop too far away
	if( count < 1 || count > MAX_VENDING || count > vsd->vend_num )
		return; // invalid amount of purchased items

	blank = pc_inventoryblank(sd); //number of free cells in the buyer's inventory

	// duplicate item in vending to check hacker with multiple packets
	memcpy(&vending, &vsd->vending, sizeof(vsd->vending)); // copy vending list

	// some checks
	z = 0.; // zeny counter
	w = 0;  // weight counter
	for( i = 0; i < count; i++ )
	{
		short amount = *(uint16*)(data + 4*i + 0);
		short idx    = *(uint16*)(data + 4*i + 2);
		idx -= 2;

		if( amount <= 0 )
			return;

		// check of item index in the cart
		if( idx < 0 || idx >= MAX_CART )
			return;

		ARR_FIND( 0, vsd->vend_num, j, vsd->vending[j].index == idx );
		if( j == vsd->vend_num )
			return; //picked non-existing item
		else
			vend_list[i] = j;

		z += ((double)vsd->vending[j].value * (double)amount);
		if( z > (double)sd->status.zeny || z < 0. || z > (double)MAX_ZENY )
		{
			clif_buyvending(sd, idx, amount, 1); // you don't have enough zeny
			return;
		}
		w += itemdb_weight(vsd->status.cart[idx].nameid) * amount;
		if( w + sd->weight > sd->max_weight )
		{
			clif_buyvending(sd, idx, amount, 2); // you can not buy, because overweight
			return;
		}
		
		//Check to see if cart/vend info is in sync.
		if( vending[j].amount > vsd->status.cart[idx].amount )
			vending[j].amount = vsd->status.cart[idx].amount;
		
		// if they try to add packets (example: get twice or more 2 apples if marchand has only 3 apples).
		// here, we check cumulative amounts
		if( vending[j].amount < amount )
		{
			// send more quantity is not a hack (an other player can have buy items just before)
			clif_buyvending(sd, idx, vsd->vending[j].amount, 4); // not enough quantity
			return;
		}
		
		vending[j].amount -= amount;

		switch( pc_checkadditem(sd, vsd->status.cart[idx].nameid, amount) ) {
		case ADDITEM_EXIST:
			break;	//We'd add this item to the existing one (in buyers inventory)
		case ADDITEM_NEW:
			new_++;
			if (new_ > blank)
				return; //Buyer has no space in his inventory
			break;
		case ADDITEM_OVERAMOUNT:
			return; //too many items
		}
	}

	//Logs (V)ending Zeny [Lupus]
	if( log_config.zeny > 0 )
		log_zeny(vsd, "V", sd, (int)z);

	pc_payzeny(sd, (int)z);
	if( battle_config.vending_tax )
		z -= z * (battle_config.vending_tax/10000.);
	pc_getzeny(vsd, (int)z);

	for( i = 0; i < count; i++ )
	{
		short amount = *(uint16*)(data + 4*i + 0);
		short idx    = *(uint16*)(data + 4*i + 2);
		idx -= 2;

		//Logs sold (V)ending items [Lupus]
		if(log_config.enable_logs&0x4) {
			log_pick_pc(vsd, "V", vsd->status.cart[idx].nameid, -amount, &vsd->status.cart[idx]);
			log_pick_pc( sd, "V", vsd->status.cart[idx].nameid,  amount, &vsd->status.cart[idx]);
		}

		// vending item
		pc_additem(sd, &vsd->status.cart[idx], amount);
		vsd->vending[vend_list[i]].amount -= amount;
		pc_cart_delitem(vsd, idx, amount, 0);
		clif_vendingreport(vsd, idx, amount);

		//print buyer's name
		if( battle_config.buyer_name )
		{
			char temp[256];
			sprintf(temp, msg_txt(265), sd->status.name);
			clif_disp_onlyself(vsd,temp,strlen(temp));
		}
	}

	// compact the vending list
	for( i = 0, cursor = 0; i < vsd->vend_num; i++ )
	{
		if( vsd->vending[i].amount == 0 )
			continue;
		
		if( cursor != i ) // speedup
		{
			vsd->vending[cursor].index = vsd->vending[i].index;
			vsd->vending[cursor].amount = vsd->vending[i].amount;
			vsd->vending[cursor].value = vsd->vending[i].value;
		}

		cursor++;
	}
	vsd->vend_num = cursor;

	//Always save BOTH: buyer and customer
	if( save_settings&2 )
	{
		chrif_save(sd,0);
		chrif_save(vsd,0);
	}

	//check for @AUTOTRADE users [durf]
	if( vsd->state.autotrade )
	{
		//see if there is anything left in the shop
		ARR_FIND( 0, vsd->vend_num, i, vsd->vending[i].amount > 0 );
		if( i == vsd->vend_num )
		{
			//Close Vending (this was automatically done by the client, we have to do it manually for autovenders) [Skotlex]
			vending_closevending(vsd);
			map_quit(vsd);	//They have no reason to stay around anymore, do they?
		}
	}
}

/*==========================================
 * Open shop
 * data := {<index>.w <amount>.w <value>.l}[count]
 *------------------------------------------*/
void vending_openvending(struct map_session_data* sd, const char* message, bool flag, const uint8* data, int count)
{
	int i, j;
	int vending_skill_lvl;
	nullpo_retv(sd);

	if( !flag ) // cancelled
		return; // nothing to do

	if (pc_istrading(sd))
		return; // can't have 2 shops at once

	vending_skill_lvl = pc_checkskill(sd, MC_VENDING);
	// skill level and cart check
	if( !vending_skill_lvl || !pc_iscarton(sd) )
	{
		clif_skill_fail(sd, MC_VENDING, 0, 0);
		return;
	}

	// check number of items in shop
	if( count < 1 || count > MAX_VENDING || count > 2 + vending_skill_lvl )
	{	// invalid item count
		clif_skill_fail(sd, MC_VENDING, 0, 0);
		return;
	}

	// filter out invalid items
	i = 0;
	for( j = 0; j < count; j++ )
	{
		short index        = *(uint16*)(data + 8*j + 0);
		short amount       = *(uint16*)(data + 8*j + 2);
		unsigned int value = *(uint32*)(data + 8*j + 4);

		index -= 2; // offset adjustment (client says that the first cart position is 2)

		if( index < 0 || index >= MAX_CART // invalid position
		||  pc_cartitem_amount(sd, index, amount) < 0 // invalid item or insufficient quantity
		//NOTE: official server does not do any of the following checks!
		||  !sd->status.cart[index].identify // unidentified item
		||  sd->status.cart[index].attribute == 1 // broken item
		||  !itemdb_cantrade(&sd->status.cart[index], pc_isGM(sd), pc_isGM(sd)) ) // untradeable item
			continue;

		sd->vending[i].index = index;
		sd->vending[i].amount = amount;
		sd->vending[i].value = cap_value(value, 1, (unsigned int)battle_config.vending_max_value);

		i++; // item successfully added
	}

	if( i != j )
		clif_displaymessage (sd->fd, msg_txt(266)); //"Some of your items cannot be vended and were removed from the shop."

	if( i == 0 )
	{	// no valid item found
		clif_skill_fail(sd, MC_VENDING, 0, 0); // custom reply packet
		return;
	}

	sd->vender_id = sd->bl.id;
	sd->vend_num = i;
	safestrncpy(sd->message, message, MESSAGE_SIZE);

	pc_stop_walking(sd,1);
	clif_openvending(sd,sd->vender_id,sd->vending);
	clif_showvendingboard(&sd->bl,message,0);

	if( use_irc && irc_announce_shop_flag )
		irc_announce_shop(sd,1);
}