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'use strict'; |
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var _ = require('lodash'), |
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Promise = require('bluebird'), |
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Move = require('./move'), |
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Position = require('./position'), |
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Grid = require('./grid'); |
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// Expose `Mower` |
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module.exports = Mower; |
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/** |
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* Set up Mower with `options` |
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* |
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* Parameters: |
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* |
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* - `id` a valid number |
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* - `grid` a valid Grid object |
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* - `position` a valid Position object |
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* - `instructions` a valid Array that contains only the following instructions : 'A', 'G' and 'D'. |
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* |
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* @param {Number} id |
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* @param {Object} grid |
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* @param {Object} position |
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* @param {Array} instructions |
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* @api public |
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*/ |
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function Mower(id, grid, position, instructions) { |
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this.id = id; |
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this.grid = grid; |
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this.position = position; |
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this.instructions = instructions; |
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this.move = new Move(this, grid); |
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this.isValid(); |
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} |
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/** |
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* Start mower's instructions |
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* |
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* @api public |
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*/ |
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Mower.prototype.start = function() { |
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var self = this; |
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return new Promise(function(resolve) { |
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self.runStep(0, resolve); // run first step |
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}); |
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}; |
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/** |
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* Types validator |
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* |
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* @api public |
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*/ |
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Mower.prototype.isValid = function() { |
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if(!_.isInteger(this.id)) { |
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throw new Error('Id is not valid'); |
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} |
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if(!isGrid(this.grid)) { |
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throw new Error('Grid is not valid'); |
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} |
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if(!isPosition(this.position)) { |
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throw new Error('Position is not valid'); |
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} |
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if(!isInstructions(this.instructions)) { |
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throw new Error('Instructions are not valid'); |
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} |
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}; |
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/** |
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* Run one step then pass to next instruction or resolve promise when instructions are finished |
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* |
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* @param {Number} step |
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* @param {Function} end |
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* @api public |
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*/ |
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Mower.prototype.runStep = function(step, end) { |
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var self = this; |
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this.move.runInstruction(this.instructions[step]).then(function() { |
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var nexStep = step+1; |
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if(nexStep >= 0 && nexStep <= self.instructions.length-1){ |
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self.runStep(nexStep, end); |
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} |
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else { |
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end(self); |
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} |
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}) |
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}; |
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/** |
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* Grid validator helper |
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* |
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* @param {Object} grid |
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* @api protected |
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*/ |
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function isGrid(grid) { |
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return grid instanceof Grid; |
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} |
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/** |
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* Position validator helper |
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* |
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* @param {Object} position |
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* @api protected |
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*/ |
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function isPosition(position) { |
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return position instanceof Position; |
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} |
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/** |
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* Instructions validator helper |
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* |
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* @param {Object} instructions |
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* @api protected |
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*/ |
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function isInstructions(instructions) { |
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return _.isArray(instructions); |
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} |
Huljo /
MowItNow
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