// Passive effects (just does stuff)
let flight		= {};
let reach		= {};
let equipped		= {}; // Entity x has [a,b,c] equipped to it


// Actives to add passives
function giveFlight(card){
	flight[card] = true;
}
function removeFlight(card){
	// If the card has flight delete entity component
	if(card in flight){
		delete flight[card];
		return true;
	}
	return false;
}
function giveReach(card){
	reach[card] = true;
}
function removeReach(card){
	if(card in reach){
		delete reach[card];
		return true;
	}
	return false;
}

// Active
function equip(){
	// Equip card to another unit

}
function unequip(){
	// Remove card from its equipped to unit

}

function drawCard(drawAmount, player){
	board.drawACard(player, drawAmount);
}

function heal(healAmount, healPlayer){
	// For each heal 1..4 
	for(let i = 0; i < healAmount; i++){
		// Loop shield
		let items = this.getItems('shield', healPlayer, null, null);
		for(let item = 0; item < items.length; item++){

			let itemKey = items[item];
			// If a shield is tapped, untap it to 'heal'
			if(board.isTapped(itemKey)){
				board.untapCard(itemKey);
			}

		}
	}
}

function hurt(hurtDamage, hurtTarget = null, hurtPlayer = null){
	// Deal X000 damage to unit this turn, or deal Y to opponent's shield
	
	// Set player/element
	if(hurtPlayer == null && hurtTarget != null){
		hurtPlayer = player[hurtTarget];
		hurtElement = boardElement[hurtTarget];
	}else{
		hurtElement = 'shield'
	}

	switch(hurtElement){
		case 'board':
			// TODO: Make temp damage this turn as well
			if(hurtDamage >= cardAttack[hurtTarget][0]){
				board.sendToGrave(hurtTarget);
			}
			break;

		case 'shield':
			let destroyCount = cardAttackToShieldDamage(hurtDamage);
			console.log(destroyCount);
			// TODO: loop player's shield, tap if they can be tapped, destroy
			// if all already tapped

			// While there's still damage to deal
			while(destroyCount > 0){

				// Keep looping through the shield belonging to target user
				let items = board.getItems('shield', hurtPlayer, null, null);
				let tappedItems = board.getItems('shield', hurtPlayer, 'tapped', null);

				for(let item = 0; item < items.length; item++){

					// If nothing more to destroy, exit loop
					if(destroyCount <= 0){ break; }

					let itemKey = items[item];
					console.log(itemKey);
					console.log(cardStatus[itemKey]);

					// If there's anything to tap, tap it
					if(cardStatus[itemKey] == null){
						console.log('been tapped');
						board.tapCard(itemKey);
						destroyCount--;
						continue;
					}

					// If there's nothing to tap, destroy it
					if(items.length == tappedItems.length){
						console.log('been destroyed');
						board.destroyShield(itemKey);
						destroyCount--;
						continue;
					}

				}
			}

			board.drawBoard();
			break; // end case 'shield'

	}
}

// Effect Trigger(s)
// Non-event triggers. i.e. these are activated triggers
// rather than things such as 'On attack', 'When opponent draws'

// When card has been actively tapped
function triggerTap(card){
	if(canTriggerTap(card) == false){ return false; }

	board.tapCard(card);

	console.log('triggerTap');
	return true;

}
// Check a card can actively be tapped, otherwise don't start trigger
function canTriggerTap(card){
	if(board.isTapped(card)){
		return false;
	}
	if(boardElement[card] != 'board'){
		return false;
	}

	console.log('can triggerTap');
	return true;
}

// Pay the mana cost(s) to trigger event
function triggerPay(triggerAmount){
	if(canTriggerPay(triggerAmount) == false){
		return false;
	}

	let effectCosts = [{1:0,2:0,3:0,4:0}, triggerAmount];
	board.tapManaRequired(null, 0, false, effectCosts);

	console.log('triggerPay');
	return true;

}
// Check the mana cost(s) can be paid, otherwise don't start trigger
function canTriggerPay(triggerAmount){
	// For player0 only at the mo. and with no specific colour costs
	let effectCosts = [{1:0,2:0,3:0,4:0}, triggerAmount];
	if(board.tapManaRequired(null, 0, true, effectCosts) == false){
		console.log('cannot trigger pay');
		return false;
	}

	console.log('Can trigger pay');
	return true;

}