class HeartManager {

	constructor() {
		this.countHearts = HeartManager.DEFAULT_COUNT;
		this.countMaxHearts = HeartManager.DEFAULT_COUNT;

		this.onChangeCountListeners = [];
		this.onChangeMaxCountListeners = [];
		this.onChangeGameOverListeners = [];
	}

	callListener(functionArray) {
		if(functionArray.length > 0) {
			for(let i = 0; i < functionArray.length; i++) {
				functionArray[i](this.score);
			}
		}
	}

	addOnChangeCountListener(onChangeFunction) {
		this.onChangeCountListeners.push(onChangeFunction);
	}

	removeOnChangeCountListener(onChangeFunction) {
		let itemIndex = this.onChangeCountListeners.indexOf(onChangeFunction);
		if(itemIndex > -1)
			this.onChangeCountListeners.splice(itemIndex, 1);
	}

	addOnChangeMaxCountListener(onChangeMaxFunction) {
		this.onChangeMaxCountListeners.push(onChangeMaxFunction);
	}

	removeOnChangeMaxCountListener(onChangeMaxFunction) {
		let itemIndex = this.onChangeMaxCountListeners.indexOf(onChangeMaxFunction);
		if(itemIndex > -1)
			this.onChangeMaxCountListeners.splice(itemIndex, 1);
	}

	addOnChangeGameOverListener(onChangeGameOverFunction) {
		this.onChangeGameOverListeners.push(onChangeGameOverFunction);
	}

	removeOnChangeHighScoreListener(onChangeGameOverFunction) {
		let itemIndex = this.onChangeGameOverListeners.indexOf(onChangeGameOverFunction);
		if(itemIndex > -1)
			this.onChangeGameOverListeners.splice(itemIndex, 1);
	}

	removeAllListeners() {
		this.onChangeCountListeners = [];
		this.onChangeMaxCountListeners = [];
		this.onChangeGameOverListeners = [];
	}


	setCount(amount) {
		let beforeCountHearts = this.countHearts;
		this.countHearts = amount;
		if(this.countHearts < 0)
			this.countHearts = 0;
		else if(this.countHearts > this.countMaxHearts)
			this.countHearts = this.countMaxHearts;

		if(beforeCountHearts !== this.countHearts)
			this.callListener(this.onChangeCountListeners);

		if(this.countHearts === 0)
			this.callListener(this.onChangeGameOverListeners);
	}

	getCount() {
		return this.countHearts;
	}

	setMaxCount(amount) {
		let beforeCountHearts = this.countMaxHearts;
		this.countMaxHearts = amount;
		if(this.countMaxHearts > HeartManager.HEART_MAX_COUNT)
			this.countMaxHearts = HeartManager.HEART_MAX_COUNT;

		if(beforeCountHearts !== this.countMaxHearts)
			this.callListener(this.onChangeMaxCountListeners);

		if(this.countHearts > this.countMaxHearts)
			this.setCount(this.countMaxHearts);
	}

	getMaxCount() {
		return this.countMaxHearts;
	}

	addHearts(amount) {
		this.setCount(this.countHearts + amount);

	}

	breakHearts(amount) {
		this.addHearts(-1 * amount);
	}

}

HeartManager.DEFAULT_COUNT			= 3;
HeartManager.HEART_MAX_COUNT		= 5;