class VhtFnBool abstract {
	virtual bool vhtRun() {return false;}
}

class VhtFnBoolFuse : VhtFnBool {
	bool      m_result;
	VhtFnBool m_fInner;
	VhtFnBoolFuse vhtInit(VhtFnBool fInner) {
		m_fInner = fInner;
		return self;
	}
	override bool vhtRun() {
		if(!m_result) {
			m_result = m_fInner.vhtRun();
		}
		return m_result;
	}
}

class VhtFnPlayer : VhtFnBool abstract {
	int m_player;
	virtual bool vhtCall(PlayerInfo p) {return false;}
	override bool vhtRun() {
		for(int i = 0; i < MAXPLAYERS; ++i) {
			if(playerInGame[i] && vhtCall(players[i])) {
				m_player = i;
				return true;
			}
		}
		return false;
	}
}

class VhtFnPlayerInSector : VhtFnPlayer {
	int m_idx;
	VhtFnPlayer vhtInit(int idx) {
		m_idx = idx;
		return self;
	}
	override bool vhtCall(PlayerInfo p) {
		return p.mo.curSector.index() == m_idx;
	}
}

class VhtFnPlayerInv : VhtFnPlayer abstract {
	class<Inventory> m_which;
	Inventory        m_result;
	override bool vhtCall(PlayerInfo p) {
		let inv = p.mo.findInventory(m_which);
		if(inv) {
			m_result = inv;
			return true;
		}
		return false;
	}
}

class VhtFnPlayerInvExist : VhtFnPlayerInv {
	VhtFnPlayerInv vhtInit(class<Inventory> which) {
		m_which = which;
		return self;
	}
}

class VhtFnPlayerInvAmount : VhtFnPlayerInv {
	int m_amount;
	VhtFnPlayerInv vhtInit(class<Inventory> which, int amount) {
		m_which  = which;
		m_amount = amount;
		return self;
	}
	override bool vhtCall(PlayerInfo p) {
		return super.vhtCall(p) && m_result.amount >= m_amount;
	}
}