Huljo / MowItNow

var _ = require('lodash');

// Expose `Position`

module.exports = Position;

var cardinalPoints = ['N','E','S','W'];

/**

 * Set up Position with `coordinate` and `cardinal`

 * @param {Object} coordinate

 * @param {String} cardinal

 * @api public

 */

function Position(coordinate, cardinal) {

    this.x = coordinate.x;

    this.y = coordinate.y;

    this.c = cardinal;

    this.isValid();

}

/**

 * Types validator

 *

 * @api public

 */

Position.prototype.isValid = function() {

    if(!isCoordinates(this.x,this.y)) {

        throw new Error('Coordinates are not valid');

    }

    if(!isCardinal(this.c)) {

        throw new Error('Cardinal point is not valid');

    }

};

/**

 * Coordinates validator helper

 *

 * @param {Number} x

 * @param {Number} y

 * @api protected

 */

/**

 * Cardinal validator helper

 *

 * @param {String} cardinal

 * @api protected

 */

function isCardinal(cardinal) {

    return _.isString(cardinal) && !_.isUndefined( _.find(cardinalPoints, function(c) { return c === cardinal; }) );

}