const gameHelper = require('./gameHelper');

// For anything related to the actual game itself (kinda)
// this will be split into different bits, but should be what manages a rooms
// game states, and alladat
// Basically here to prevent circular dependencies (where I can)


// PlayerId is using array 0,1,2 for now, not the actual id
// actual Id would be better, but the player should be passed correctly
// from the client. They can edit data, but server-side validation SHOULD prevent
// in the future
function passTurn(roomId, playerId){

	// TODO:Check playerId and roomId before doing the stuff, to verify the user
	// IS the user, and in the room

	let playerTurn = global.roomData[roomId].itemData.component.playerTurn;
	//global.socketAlert(roomData[roomId].playerData[playerId].socketId, playerTurn, 'log');

	if(playerTurn != playerId){
		global.socketAlert(global.getPlayerSocketFromRoom(playerId, roomId), 'Not your turn', 'alert');
		return false;
	};

	// Turns are 0,1,0,1 at the mo, no coinflip or re-order, etc. so this JANK is ok for now
	// %2 as 2 players and Ids are 0 and 1 so it works
	let newPlayerTurn = (playerTurn + 1)%maxPlayersPerRoom;
	global.roomData[roomId].itemData.component.playerTurn = newPlayerTurn;

	// If it's back to the player that went first, the turn count increased too
	if(playerTurn == 0){
		global.roomData[roomId].itemData.component.turn++;
	}

	// Send turn data to each player
	global.socketResponsePassTurn(roomId);

	// Let the player know it's their turn via alert too (in case tabbed out)
	// TODO: This could probably be done front-end from the newPlayerTurn in socketResponsePassTurn
	global.socketAlert(roomData[roomId].playerData[newPlayerTurn].socketId, 'Your turn', 'alert');

	// Start of the new players turn, draw a card
	drawACard(roomId, newPlayerTurn);
	
}

function drawACard(roomId, playerId){
	
	if(global.roomData[roomId].itemData.component.cardCount.hand[playerId] >= 2){
		global.socketAlert(roomData[roomId].playerData[playerId].socketId, 'Hand full; cannot draw card', 'alert');
		return false;
	}
	if(global.roomData[roomId].itemData.component.cardCount.deck[playerId] <= 0){
		global.socketAlert(roomData[roomId].playerData[playerId].socketId, 'Deck empty; cannot draw card', 'alert');
		return false;
	}

	// TODO: Check no card event/trigger occured that prevents/change draw card



	// Change position to last position available in hand
	let fromPosition = global.roomData[roomId].itemData.component.cardCount.deck[playerId]; // 'top' of deck
	let toPosition = global.roomData[roomId].itemData.component.cardCount.hand[playerId] + 1; // Rightmost hand pos (starting at 1)

	// ECSey att2, there's surely a better way of getting playerX top card within inDeck?
	// Tried unions but it messes up the object data. Maybe need to have no data in each object
	// and have it literally just be keys?

	// Get each card from the deck
	for (const [key, value] of Object.entries(global.roomData[roomId].itemData.component.inDeck)) {
		// Key is the entity here

		// If the card inDeck does not belongs to the player, skip over it
		if(global.roomData[roomId].itemData.component.player[key] != playerId){
			continue;
		}

		// If the card isn't the last (bottom) card of deck, skip over it
		// TODO: -1 is jank, sort so listPositions all start from 1..x
		if(global.roomData[roomId].itemData.component.listPosition[key] != fromPosition){
			continue;
		}

		// The main man
		// Move positions in hand/deck, and put the item from the deck into the hand
		gameHelper.setCardPosition(roomId, playerId, key, toPosition, global.roomData[roomId].itemData.component.hand, fromPosition, global.roomData[roomId].itemData.component.inDeck);

	}

	// Reduce deckSize by 1 for the player that drew
	global.roomData[roomId].itemData.component.cardCount.deck[playerId]--;
	// And increase the hand size by 1
	global.roomData[roomId].itemData.component.cardCount.hand[playerId]++;

	// Then emit the deckSize and hand size to all the player's sockets
	global.socketResponseDrawCard(roomId, playerId);
	
	// Emit the 'hand' and related cardData for cards in the players hand
	// Could merge this with the top?
	global.socketResponsePlayerDrewCard(roomId, playerId);
	
}

// TODO: Rename and rejig the 3 play from hand functions
function playFromHand(roomId, playerId, position){

	let cardId = null;
	// Get the cardId of the card from position within players hand
	for (const [key, value] of Object.entries(global.roomData[roomId].itemData.component.hand)) {
		// Key is the entity here

		// If the card in hand's position does not match the position passed, skip it
		if(global.roomData[roomId].itemData.component.listPosition[key] != position){
			continue;
		}

		cardId = key;
		break;

	}
	
	// Then play the card
	if(cardId == null){
		// TODO: Respond to player (who triggered play) that this
		// is an 'illegal/errored' move via socket
		return false;
	}

	playACardFromHand(roomId, playerId, cardId);

}

function playACardFromHand(roomId, playerId, cardId){

	// Add the card to field (and its effect to 'stack') or spell to the 'stack'
	if(playACard(roomId, playerId, cardId, 'hand') !== true){
		// TODO: Return socket to player about 'illegal move' and why
		return false;
	}

	// If the card can be played/had been
	// Reduce handSize by 1 for the player that played the card
	global.roomData[roomId].itemData.component.cardCount.hand[playerId]--;
	

	// TODO: Send a socket response for 'played a card from hand' with cardData
	// of said card. This is sent so that it can be 'chained' and added to the stack
	// On play, it is put onto field/activated but the effect(s) don't occur until both/all
	// players have a chance to 'chain', once the 'chain' is completed, the effect(s) trigger
	global.socketResponsePlayFromHand(roomId, playerId, cardId);



}

// 'Play' a card is activation with cost (triggering play events)
// 'Summon' puts it onto the board without play events
// yada yada to think about in future
function playACard(roomId, playerId, cardId, playedFrom){
	
	// Play a unit
	if(cardId in global.roomData[roomId].itemData.component.type.unit){
		// Play to board. If there's a 'onPlay' effect, add that to the 'stack'
		return playAUnit(roomId, playerId, cardId, playedFrom);
	}

	// Cast a spell
	if(cardId in global.roomData[roomId].itemData.component.type.spell){
		// Add the card/effect onto the 'stack'. When complete/cancelled send to grave
		return playASpell(roomId, playerId, cardId, playedFrom);
	}

	// Add a token
	if(cardId in global.roomData[roomId].itemData.component.type.token){
		// ???? Tokens maybe just onto other cards as 'equips' or as standalones? IDK
		return playAToken(roomId, playerId, cardId, playedFrom);
	}

}

function playAUnit(roomId, playerId, cardId, playedFrom){

	console.log('playAUnit');

	// TODO: Costs

}
function playASpell(roomId, playerId, cardId, playedFrom){

	console.log('playASpell');

	// TODO: Pay costs (Need to play mana first...)
	
	// TODO: If spell has different effects, select which one/ensure
	// correct one is used based on criteria

	// Add to stack (each part of the spells effect)
	// TODO: Use actual effects, for now just adding a 'drawCard' for testing
	
	addToStack(roomId, playerId, cardId, null);

}
function playAToken(roomId, playerId, cardId, playedFrom){

}

// Not 100% sure how to implement the stack
// TODO: Make it better
// TODO: Make it do actual things, currently just adds 'drawCard' effect
function addToStack(roomId, playerId, cardId, effectId){
	
	// Stack does its own effect, or 'counter' etc. the card prior to it on the stack
	// etc. etc.
	// TODO: Add card effect to stack in reverse order OR have the stack work from x..0
	// prolly the latter, makes sense to me

	let stack = global.roomData[roomId].itemData.component.stack;
	let stackLength = Object.keys(stack).length;

	// TODO: First ensure the cardEffects are added in their step order 1..x
	// Add as next event in the stack 1..x
	// TODO: Use actual effect, not just 'draw' as that's just for testing
	global.roomData[roomId].itemData.component.stack[stackLength + 1] = 
		{
			 'cardId': cardId
			,'effect': null
			,'effectStep': null
			,'targetCard': null
			,'targetPlayer': playerId
		};

	console.log(global.roomData[roomId].itemData.component.stack);

	// TODO: TEMP, this will need to wait for a 'resolve' accept from both players before the stack
	// would trigger.
	resolveStack(roomId);

}

function resolveStack(roomId){

	// Does the next effect in the stack, if something
	// is to chain onto the stack that would instead trigger
	// 'addToStack' after paying any costs
	
	// If there is anything in the stack
	let stackLength = Object.keys(global.roomData[roomId].itemData.component.stack).length;
	if(stackLength > 0){

		// Trigger the last (most recently added to) the stack effect
		// THIS WILL NOW ACTUALLY CAST THE EFFECT STEP WITHOUT INTERRUPT
		// While the stack is being resolved their are no counters/chains until
		// the next stack action which players will get option to chain or not again

		console.log(
			global.roomData[roomId].itemData.component.stack[stackLength]
		);

	}

}

// Shuffle the deck 'randomly' for a certain player
function shuffleDeck(roomId, playerId){

	// Create a tempDeck array of same length of the player deck
	let deckLength = global.roomData[roomId].itemData.component.cardCount.deck[playerId];
	let tempDeck = Array.from(Array(deckLength).keys());

	// Loop the tempDeck and shuffle
	// https://stackoverflow.com/a/73603221
	for(let i = 0; i < deckLength; i++){

		// picks the random number between 0 and length of the deck (-1 so 0..34)
		let shuffle = Math.floor(Math.random() * (tempDeck.length - 1));

		// swap the current listPosition with a random one with the deck count
		[ tempDeck[i], tempDeck[shuffle] ] = [ tempDeck[shuffle], tempDeck[i] ];

	}

	let tempDeckItem = 0;
	// Now change the related inDeck entities listPositions to match the random number from tempDeck
	for (const [key, value] of Object.entries(global.roomData[roomId].itemData.component.inDeck)) {

		if(global.roomData[roomId].itemData.component.player[key] != playerId){
			continue;
		}

		// Add the tempDeckItems number as the listPosition for the inDeck item
		// + 1 as listPositions start at 1
		global.roomData[roomId].itemData.component.listPosition[key] = tempDeck[tempDeckItem] + 1;

		// Move to next tempDeckItem
		tempDeckItem++;
		
	}

	global.socketResponseShuffleDeck(roomId, playerId, true);

}


// DATA RETURNER DUDES
// TODO: Where to put this? Kind of a helper, kind of functionality. Hmmmmm
// maybe do a dataHelper? then anything to return data can be included there?
// TODO: May get all the data from hand, board, grave, etc. in functions
// like this, then union all the data and return that in one swoomp
// Probably better to just get all the keys from the boardlemenets and do
// the loop once though...
function getPlayerHandData(roomId, playerId){

	let handEntities = {};
	let handPositions = {};
	let handCardData = {};

	for (const [key, value] of Object.entries(global.roomData[roomId].itemData.component.hand)) {

		// Key is entity ID here

		// If the entity in hand belongs to the player, then they are allowed its data
		if(global.roomData[roomId].itemData.component.player[key] == playerId){

			// Get entity of items in the hand
			handEntities[key] = global.roomData[roomId].itemData.component.hand[key];
			// Get listPosition of just items in the hand
			handPositions[key] = global.roomData[roomId].itemData.component.listPosition[key];
			// Same for cardData
			handCardData[key] = global.roomData[roomId].itemData.component.cardData[key]; // TODO: Nothing on client side?

			// Leaving other bits for now

		}

	}

	return {
		'handEntities': handEntities,
		'handPositions': handPositions,
		'handCardData': handCardData
	};

}


module.exports = {
	 passTurn
	,getPlayerHandData
	,drawACard
	,shuffleDeck
	,playFromHand
};