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


// Trigger types
const triggerTypes = {
	'tap': 1,
	'pay': 2,
};
// Basic effects
// TODO: Pull display name/description from DB?
const basicEffects = {
	1: 'Equip',
	2: 'Heal',
	3: 'Hurt',
	4: 'Recruit',
	5: 'Give Flight',
};


// 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;

}

// Pay/Activate (all) the triggers
function doEffectTriggers(itemKey, effectIndex, checkOnly = false){

	// Check card has effectData
	let effectData = cardEffect[itemKey];
	if(effectData === undefined){ return false; } // No effect

	// Check effectData contains target effect
	let effect = effectData[effectIndex];
	if(effect === undefined){ return false; } // No effect

	// Loop each trigger, AND activate them
	for (const [key, value] of Object.entries(effect['trigger'])) {

		let effectTrigger = effect['trigger'][key];
			console.log('--- Trigger '+key+' ---');
			console.log(effectTrigger['triggerTypeId']);

		// TAP TRIGGER
		if(effectTrigger['triggerTypeId'] == triggerTypes.tap){
			if(canTriggerTap(itemKey) == false){
				console.log('Tap trigger, cannot be triggered');
				return false;
			}

			// Do the trigger, then continue to next trigger
			if(!checkOnly){board.tapCard(itemKey);}
			continue;

		}


		// PAY TRIGGER
		if(effectTrigger['triggerTypeId'] == triggerTypes.pay){

			// To build the colourReq TODO: Change as could be 1 of either red/blue
			// for instance
			let colourReq = {1:0,2:0,3:0,4:0};

			// Loop pay required (colours) for said trigger
			// BUILD the colourReq loop needed for tapMana check
			effectTrigger['target'].forEach((effectTriggerTarget) => {

				// Increment colourReq by one of that colour
				// THIS WILL NEED REDOING, AS MAYBE IT'S 2 OF RED OR BLUE!!
				colourReq[effectTriggerTarget.colourId]++;

			});

			// Check if the cost (and colour req.) can be paid
			canPay = board.tapManaRequired(null, null, true, [colourReq, effectTrigger['amount']]);
			if(canPay !== true){ 
				console.log('Pay trigger, cannot be triggered');
				return false;
			}

			// Pay trigger costs, then continue to next trigger
			if(!checkOnly){
				board.tapManaRequired(null, null, false, [colourReq, effectTrigger['amount']]);
			}
			continue;
			
		}

		// OTHER TRIGGERS

	}

	return true;

}

function activateEffect(){
	// Do effect triggers, then doEffect once payed
}

function getEffect(itemKey, effectIndex){
	// Check card has effectData
	let effectData = cardEffect[itemKey];
	if(effectData === undefined){ return false; } // No effect

	// Check effectData contains target effect
	let effect = effectData[effectIndex];
	if(effect === undefined){ return false; } // No effect

	return effect;
}
// Get all the targets for effect step, so they can be targgeted
// by the effect/selected by the player
function getEffectStepTargets(itemKey, effectIndex, effectStep, fromBoardElement, playerId){

	// Get Effect
	let effect = getEffect(itemKey, effectIndex);
	if(effect == false){ return false; }

	// Get the step
	let step = effect['step'][effectStep];
	if(step == undefined){ return false; }

	// The items that can be targetted with the effectStep
	let itemsToSelectFrom = [];

	// Loop the target location (or all locations)
	// Check which cards meet the criteria in the DB
	

	// TODO: Not 100% sure how to keep track. May need a var for each item in previous steps
	// or previous chains so they can be accessed, and used
	// If itemFromStep, return the itemKeys of the items selected from a previous step
	/*
	if(target['itemFromStep'] == null){
		// So something from step 1 needs to be selected by this.
	}
	*/
	

	// boardElement, playerId, cardStatus, listPosition
	let items = board.getItems(fromBoardElement, playerId, null, null); // TODO: maybe 'from top of deck, or if tapped'
	for(let item = 0; item < items.length; item++){
		// TODO: MAYBE ADD THE COLOUR/PASSIVE CHECKS to the getItems itself

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

		// If the item from getItems meets the criterias of target DB
		step['target'].forEach((target) => {

			// Check the class the same for target, and item
			// If targetDB has null this means 'any' so is always correct
			// Check Class (TODO: mixed classes, colours, etc ie select 1 red+blue card)
			/*
			if(class[itemKey] == target['classId'] || target['classId'] == null){

			}
			*/

			// Check colour
			// If not null check the colours, otherwise null means any colour is ok
			if(target['colourId'] !== null){ 
				// Check the colours to see if one is of requirement
				cardColours[itemKey].forEach((colour) => {
					// If the colour doesn't match, continue to next target (forEach)
					if(colour[0] != target['colourId']){
						// The return below is just a 'continue' in forEach terms
						return; // forEach jank. forEach executes the 'function' 'target' each loop
					}
					// If the colour is correct, keep checking requirements
				});
			}
			
			// Check passive (If hasPassive(id))
			/*
			if(cardColours[itemKey] == target['passiveId'] || target['passiveId'] == null){

			}
			*/

			/*
			if(cardType[itemKey] == target['typeId'] || target['typeId'] == null){

			}
			*/

			// Once all the target Req. have been checked against the item
			// and they match, add to selectable list
			itemsToSelectFrom.push(itemKey);

		});

	}

	return itemsToSelectFrom;


}


// Recusively call doEffect until each is done?
// Once recruit (play from hand) is triggered, need to allow user to select
// then when done move to next step
function doEffect(itemKey, effectIndex, effectStep = 1){

	let effect = getEffect(itemKey, effectIndex);
	if(effect == false){ return false; }

	// Get the step
	let step = effect['step'][effectStep];
	if(step == undefined){ return false; }


	// For each step, activate the correct effect type on
	// the correct targets.

	switch (step['basicEffectId']){

		// Recruit
		case 4:
		recruitCard(itemKey, effectIndex, effectStep, step['amount']);
		break;

		// Give Flight
		case 5:
		console.log('GIVE FLIGHT');
		break;

	}

	// Now do the next step, if there's another in the effect
	if(effect['step'][effectStep++] !== undefined){
		doEffect(itemKey, effectIndex, effectStep++);
	}
}

function recruitCard(itemKey, effectIndex, effectStep, targetAmount){
	console.log('RECRUIT');

	let fromBoardElement = 'hand'; // FOR NOW, JUST TO TEST, THIS WILL BE PER BASIC EFFECT
	let playerId = 0;

	let targets = getEffectStepTargets(itemKey, effectIndex, effectStep, fromBoardElement, playerId);
	console.log(targets);

	if(targetAmount > 0 && targets.length > 0){

		let selectedTarget = prompt("Select a card to recruit: \n"+targets, targets[0]);
		// User didn't select anything
		if (selectedTarget == null || selectedTarget == "") {
			alert('No card recruited, c ya');
			return false;
		}
		// User inputted card not in ID (obv temp, as will be done in game UI)
		if (!selectedTarget.includes(selectedTarget)){
			alert('Not in selection');
			return false;
		}

		// Remove the card from the selection
		targets.splice(targets.indexOf(selectedTarget), 1);

		// Play recruited card
		// TODO: Maybe needs a new function 'playRecruitedCard' for different event triggers
		board.playCardToBoard(listPosition[itemKey], boardElement[itemKey], 'board', 0, 0, 1);

	}


}