#include <amxmodx>
#include <amxmisc>
#include <fakemeta>
#include <hamsandwich>
#include <xs>
 
new const Plugin[] = "Easy Weapon Trade"
new const Author[] = "joaquimandrade and ConnorMcLeod"
new const Version[] = "1.0"
 
const m_pLastPrimaryItem = 368 
const m_pLastSecondaryItem = 369 	 
const m_pActiveItem = 373 
 
const m_iId = 43 
const m_iIdLinuxOffset = 4
 
const MaxSlots = 32
 
new IsTryingTradeWith[MaxSlots+1]
new IsTradingWith[MaxSlots+1]
new IsTradingItem[MaxSlots+1]
new WeaponType:IsTradingWeaponType[MaxSlots+1]
new Float:LastTradeStartTime[MaxSlots+1]
new Float:LastTradeEndTime[MaxSlots+1]
 
new Float:TradeMaxDistance
new CanTradeDiffCategoryWeapons
new TradeDelay
new Float:TradeCoolDown
 
new MsgBarTimeIndex
 
enum WeaponType
{
	Primary,
	Secondary
}
 
static PlayerWeaponsOffsets[WeaponType] = {m_pLastPrimaryItem,m_pLastSecondaryItem}
 
public plugin_init()
{
	register_plugin(Plugin,Version,Author)
 
	RegisterHam(Ham_ObjectCaps,"player","playerUse")
 
	CanTradeDiffCategoryWeapons = get_pcvar_num( register_cvar("easy_weapon_trade_diff","1")) //A cvar a cserét határozza meg, tehát a játékos képes elcserélni Elsődleges fegyverét egy Másodlagosra.
	TradeDelay = get_pcvar_num( register_cvar("easy_weapon_trade_delay","1")) // A csere késés/várakoztatási ideje.
	TradeCoolDown = get_pcvar_float( register_cvar("easy_weapon_trade_cooldown","3.0")) //Az időt határozza meg, melytől újra lehet cserélni.
	TradeMaxDistance = get_pcvar_float( register_cvar("easy_weapon_trade_maxdist","30.0")) //A távolságot határozza meg, melytől a játékosok tudnak cserélni.
 
	MsgBarTimeIndex = get_user_msgid("BarTime")
 
	register_cvar("easyWeaponTrade",Version,FCVAR_SERVER|FCVAR_SPONLY);
}
 
getLookingAt(id)
{
	static Float:start[3],Float:viewOffset[3],Float:path[3],Float:dest[3]
 
	pev(id,pev_origin,start);
	pev(id,pev_view_ofs,viewOffset);
	xs_vec_add(start,viewOffset,start);
 
	pev(id,pev_v_angle,path);
	engfunc(EngFunc_MakeVectors,path);
	global_get(glb_v_forward,path);
 
	xs_vec_mul_scalar(path,TradeMaxDistance,dest);
	xs_vec_add(start,dest,dest);
 
	engfunc(EngFunc_TraceLine,start,dest,0,id,0);
 
	new hit = get_tr2(0,TR_pHit)
 
	return 1 <= hit <= MaxSlots  ? hit : 0
}
 
checkTrade(id)
{
	if(!IsTradingWith[id])
	{
		new Float:currentTime = get_gametime()
 
		if(currentTime >= (LastTradeEndTime[id] + TradeCoolDown))
		{
			new idLookingAt = getLookingAt(id)
 
			if(idLookingAt && (get_user_team(id) == get_user_team(idLookingAt)) && currentTime >= (LastTradeEndTime[idLookingAt] + TradeCoolDown))
			{
				if((IsTryingTradeWith[id] = idLookingAt) && (IsTryingTradeWith[idLookingAt] == id))
				{			
					new activeItem = get_pdata_cbase(id,m_pActiveItem)
					new lookingAtActiveItem = get_pdata_cbase(idLookingAt,m_pActiveItem)
 
					new bool:canTrade
 
					if(CanTradeDiffCategoryWeapons)
					{
						new bool:idCanTrade
						new bool:lookingAtCanTrade
 
						for(new WeaponType:i=WeaponType:Primary;i<WeaponType;i++)
						{
							if(activeItem == get_pdata_cbase(id,PlayerWeaponsOffsets[i]))
							{
								IsTradingWeaponType[id] = i
								idCanTrade = true
							}
							if(lookingAtActiveItem == get_pdata_cbase(idLookingAt,PlayerWeaponsOffsets[i]))
							{
								IsTradingWeaponType[idLookingAt] = i
								lookingAtCanTrade = true
							}
						}
 
						canTrade = idCanTrade && lookingAtCanTrade
					}
					else
					{
						for(new WeaponType:i=WeaponType:Primary;i<=WeaponType;i++)
						{
							if((activeItem == get_pdata_cbase(id,PlayerWeaponsOffsets[i])) && (lookingAtActiveItem == get_pdata_cbase(idLookingAt,PlayerWeaponsOffsets[i])))
							{
								canTrade = true						
								break;
							}
						}
					}
 
					if(canTrade)
					{
						if(TradeDelay)
						{
							startTrade(id,idLookingAt,activeItem,lookingAtActiveItem,TradeDelay)
						}
						else
						{
							finishTrade(id,idLookingAt)
						}
					}
				}
			}
		}
	}
	else
	{
		new idLookingAt = getLookingAt(id)
 
		if(idLookingAt)
		{
			new activeItem = get_pdata_cbase(id,m_pActiveItem)
			new lookingAtActiveItem = get_pdata_cbase(idLookingAt,m_pActiveItem)
 
			if((IsTradingWith[id] != idLookingAt) || (IsTradingWith[idLookingAt] != getLookingAt(idLookingAt)) || (lookingAtActiveItem != IsTradingItem[idLookingAt]) || (activeItem != IsTradingItem[id]))
			{
				stopTrade(id,IsTradingWith[id])
			}
			else if(get_gametime() >= (LastTradeStartTime[id] + TradeDelay))
			{
				finishTrade(id,IsTradingWith[id])
			}
		}
	}
}
 
startTrade(id,id2,activeItem,activeItem2,tradeDelay)
{	
	IsTryingTradeWith[id] = IsTryingTradeWith[id2] = 0
 
	LastTradeStartTime[id] = LastTradeStartTime[id2] = get_gametime()
 
	IsTradingItem[id] = activeItem
	IsTradingItem[id2] = activeItem2
 
	IsTradingWith[id] = id2
	IsTradingWith[id2] = id
 
	showBar(id,tradeDelay)
	showBar(id2,tradeDelay)
}
 
finishTrade(id,id2)
{	
	ExecuteHam(Ham_RemovePlayerItem,id,IsTradingItem[id])
	ExecuteHam(Ham_RemovePlayerItem,id2,IsTradingItem[id2])
 
	set_pdata_cbase(id,PlayerWeaponsOffsets[IsTradingWeaponType[id]],-1)
	set_pdata_cbase(id2,PlayerWeaponsOffsets[IsTradingWeaponType[id2]],-1)
 
	user_has_weapon(id,get_pdata_int(IsTradingItem[id],m_iId,m_iIdLinuxOffset),0)
	user_has_weapon(id2,get_pdata_int(IsTradingItem[id2],m_iId,m_iIdLinuxOffset),0)
 
	if(IsTradingWeaponType[id] != IsTradingWeaponType[id2])
	{
		static weaponClass[] = "weapon_smokegrenade"
 
		new oldItem = get_pdata_cbase(id,PlayerWeaponsOffsets[IsTradingWeaponType[id2]])
 
		if(oldItem != -1)
		{
			pev(oldItem,pev_classname,weaponClass,charsmax(weaponClass))
			engclient_cmd(id,"drop",weaponClass)
		}
 
		new oldItem2 = get_pdata_cbase(id2,PlayerWeaponsOffsets[IsTradingWeaponType[id]])
 
		if(oldItem2 != -1)
		{
			pev(oldItem2,pev_classname,weaponClass,charsmax(weaponClass))
			engclient_cmd(id2,"drop",weaponClass)
		}
	}
 
	ExecuteHam(Ham_AddPlayerItem,id,IsTradingItem[id2])
	ExecuteHam(Ham_AddPlayerItem,id2,IsTradingItem[id])
 
	stopTrade(id,id2)
 
	LastTradeEndTime[id] = LastTradeEndTime[id2] = get_gametime()
}
 
stopTrade(id,id2)
{
	IsTradingWith[id] = IsTradingWith[id2] = 0
 
	showBar(id,0)
	showBar(id2,0)
}
 
showBar(id,barTime)
{
	message_begin(MSG_ONE_UNRELIABLE, MsgBarTimeIndex,.player=id)
	write_short(barTime) 
	message_end()
}
 
public playerUse(id)
{
	if(is_user_connected(id))
	{
		if(pev(id,pev_button) & IN_USE)
		{
			checkTrade(id)
		}
		else if(IsTradingWith[id])
		{
			stopTrade(id,IsTradingWith[id])
		}
	}
}