tutorials/nodeJS/warriorjs/tom-beginner/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.status = {
			_health: 20,
			health: 20,
			isHealing: false,
			damage: false,
			direction: 'forward',
			space: 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.status.space = this.warrior.feel(this.status.direction);
	}
	/**
	 * Determine if the adjacent spaces are empty
	 *
	 * @param {String} direction
	 * @return {Space | boolean}
	 */
	isNotEmptyInSight(direction) {
		return this.warrior.look(direction).find(space => ! space.isEmpty());
	}
	/**
	 * See if there is an enemy within sight
	 *
	 * @param {String} direction
	 * @return {boolean}
	 */
	isEnemyInSight(direction) {
		const space = this.isNotEmptyInSight(direction);
		return space && space.isEnemy();
	}
	/**
	 * See if the wall is in sight
	 *
	 * @param {String} direction
	 * @return {boolean}
	 */
	isWallInSight(direction) {
		const space = this.isNotEmptyInSight(direction);
		return space && space.isWall();
	}
	/**
	 * See if a captive is in sight
	 *
	 * @param {String} direction
	 * @return {boolean}
	 */
	isCaptiveInSight(direction) {
		const space = this.isNotEmptyInSight(direction);
		return space && space.isCaptive();
	}
	/**
	 * Check if you can see the stairs
	 *
	 * @param {String} direction
	 * @return {boolean}
	 */
	areStairsInSight(direction) {
		const space = this.warrior.look(direction).find(space => space.isStairs());
		return Boolean(space);
	}
	/**
	 * 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;
		}
	}
	/**
	 * Reverse direction and pivot
	 */
	turnAround() {
		const newDirection = reverseMap[this.status.direction];
		this.status.direction = newDirection;

		this.warrior.pivot(newDirection);
	}
	/**
	 * 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) {
			case this.status.space.isWall():
				this.turnAround();
			break;

			case this.status.space.isEnemy():
				this.warrior.attack(direction);
			break;

			case this.status.space.isCaptive():
				this.warrior.rescue(direction);
			break;

			// Empty space
			default:
				// 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[this.status.direction]);
				} else {
					// Determine what to do based on what you can see
					switch(true) {
						// Take care of the enemy behind you
						case this.isEnemyInSight(reverseMap[direction]):
							this.warrior.shoot(reverseMap[direction]);
						break;

						// Take care of the enemy in front of you
						case this.isEnemyInSight(direction):
							this.warrior.shoot(direction);
						break;

						// After taking care of enemies, look behind
						// to see if you should turn around because of a
						// wall, or if you need to rescue some captives
						case ( ! this.areStairsInSight(direction)) && this.isWallInSight(direction):
						case this.isCaptiveInSight(reverseMap[direction]):
							this.turnAround();
						break;

						// On to the next space!
						default:
							this.warrior.walk(direction);
						break;
					}
				}
			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.status.direction);

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