tutorials/nodeJS/warriorjs/tim-intermediate/Player.js

const reverseMap = {
	forward: 'backward',
	backward: 'forward',
	left: 'right',
	right: 'left'
};

/**
 * Class determining player actions for warriorjs 'game'
 */
class Player {
	constructor() {
		this.warrior = null;
		this.direction = 'forward';

		this.status = {
			_health: 20,
			health: 20,
			isHealing: false,
			damage: false
		};

		this.adjacent = {
			forward: null,
			backward: null,
			left: null,
			right: null
		};
	}
	/**
	 * Collect information about the world for the Turn
	 */
	sense() {
		this.status.health = this.warrior.health(); // Health of current turn
		this.status.damage = (this.status._health > this.status.health);

		this.direction = this.warrior.directionOfStairs();

		this.adjacent = {
			forward: this.warrior.feel('forward'),
			backward: this.warrior.feel('backward'),
			left: this.warrior.feel('left'),
			right: this.warrior.feel('right')
		};
	}
	/**
	 * Logic for resting to gain health
	 */
	heal() {
		if (this.status.isHealing === false) {
			this.status.isHealing = true;
		}

		this.warrior.rest();

		// Stop healing when at penultimate heath level
		// or if taking damage
		if (this.status.health >= 18 || this.status.damage) {
			this.status.isHealing = false;
		}
	}
	isNothingAdjacent() {
		let allClear = true;

		for (const dir in this.adjacent) {
			if ( ! (this.adjacent[dir].isEmpty() || this.adjacent[dir].isWall())) {
				return false;
			}
		}

		return allClear;
	}
	/**
	 * Does an adjacent enemy exist?
	 */
	isEnemyInRange() {
		for (const dir in this.adjacent) {
			if (this.adjacent[dir].isEnemy()) {
				return true;
			}
		}

		return false;
	}
	/**
	 * Determine if there are multiple adjacent enemies
	 */
	areMultipleEnemiesAdjacent() {
		let numEnemies = 0;

		for(const dir in this.adjacent) {
			if (this.adjacent[dir].isEnemy() {
				numEnemies++;
			}
 		}

		return (numEnemies > 1);
	}
	/**
	 * Return the direction of the first ajacent enemy found
	 *
	 * @return {string | boolean}
	 */
	findAdjacentEnemy() {
		let enemy = false;

		for (const dir in this.adjacent) {
			if (this.adjacent[dir].isEnemy()) {
				return dir;
			}
		}

		return false;
	}
	/**
	 * Determine what to do based on what you've found with the senses
	 *
	 * @param direction - The direction to go for the next turn
	 */
	next(direction) {
		switch(true) {
			// There are multiple adjacent enemies
			case this.areMultipleEnemiesAdjacent():
				this.warrior.bind(this.findAdjacentEnemy());
			break;

			// There's an adjacent enemy
			case this.isEnemyInRange():
				this.warrior.attack(this.findAdjacentEnemy());
			break;

			// Nothing directly adjacent
			case this.isNothingAdjacent():
				// Check health (From 0 to 20)
				if ( ! this.status.damage && (this.status.health <= 16 || this.status.isHealing === true)) {
					this.heal();
				} else if (this.status.damage && this.status.health <= 12)  {
					// Low health and taking damage
					// Retreat to be able to heal
					this.warrior.walk(reverseMap[direction]);
				} else {
					this.warrior.walk(direction);
				}
			break;
		}
	}
	/**
	 * Callback for each Turn
	 *
	 * @param warrior - The player object
	 */
	playTurn(warrior) {
		// Save the warrior object for other methods
		this.warrior = warrior;

		// Examine the world
		this.sense();

		// Figure out what to do with the next space
		this.next(this.direction);

		// Save current health
		this.status._health = this.status.health;
	}
}