/* global Module */

/* Magic Mirror
 * Module: WeatherForecast
 *
 * By Michael Teeuw http://michaelteeuw.nl
 * MIT Licensed.
 */

Module.register("weatherforecast",{

	// Default module config.
	defaults: {
		location: "",
		locationID: "",
		appid: "",
		units: config.units,
		maxNumberOfDays: 7,
		updateInterval: 10 * 60 * 1000, // every 10 minutes
		animationSpeed: 1000,
		timeFormat: config.timeFormat,
		lang: config.language,
		fade: true,
		fadePoint: 0.25, // Start on 1/4th of the list.

		initialLoadDelay: 2500, // 2.5 seconds delay. This delay is used to keep the OpenWeather API happy.
		retryDelay: 2500,

		apiVersion: "2.5",
		apiBase: "http://api.openweathermap.org/data/",
		forecastEndpoint: "forecast/daily",

		iconTable: {
			"01d": "wi-day-sunny",
			"02d": "wi-day-cloudy",
			"03d": "wi-cloudy",
			"04d": "wi-cloudy-windy",
			"09d": "wi-showers",
			"10d": "wi-rain",
			"11d": "wi-thunderstorm",
			"13d": "wi-snow",
			"50d": "wi-fog",
			"01n": "wi-night-clear",
			"02n": "wi-night-cloudy",
			"03n": "wi-night-cloudy",
			"04n": "wi-night-cloudy",
			"09n": "wi-night-showers",
			"10n": "wi-night-rain",
			"11n": "wi-night-thunderstorm",
			"13n": "wi-night-snow",
			"50n": "wi-night-alt-cloudy-windy"
		},
	},

	// Define required scripts.
	getScripts: function() {
		return ["moment.js"];
	},

	// Define required scripts.
	getStyles: function() {
		return ["weather-icons.css", "weatherforecast.css"];
	},

	// Define required translations.
	getTranslations: function() {
		// The translations for the defaut modules are defined in the core translation files.
		// Therefor we can just return false. Otherwise we should have returned a dictionairy.
		// If you're trying to build yiur own module including translations, check out the documentation.
		return false;
	},

	// Define start sequence.
	start: function() {
		Log.info("Starting module: " + this.name);

		// Set locale.
		moment.locale(config.language);

		this.forecast = [];
		this.loaded = false;
		this.scheduleUpdate(this.config.initialLoadDelay);

		this.updateTimer = null;

	},

	// Override dom generator.
	getDom: function() {
		var wrapper = document.createElement("div");

		if (this.config.appid === "") {
			wrapper.innerHTML = "Please set the correct openweather <i>appid</i> in the config for module: " + this.name + ".";
			wrapper.className = "dimmed light small";
			return wrapper;
		}

		if (this.config.location === "") {
			wrapper.innerHTML = "Please set the openweather <i>location</i> in the config for module: " + this.name + ".";
			wrapper.className = "dimmed light small";
			return wrapper;
		}

		if (!this.loaded) {
			wrapper.innerHTML = this.translate('LOADING');
			wrapper.className = "dimmed light small";
			return wrapper;
		}

		var table = document.createElement("table");
		table.className = "small";

		for (var f in this.forecast) {
			var forecast = this.forecast[f];

			var row = document.createElement("tr");
			table.appendChild(row);

			var dayCell = document.createElement("td");
			dayCell.className = "day";
			dayCell.innerHTML = forecast.day;
			row.appendChild(dayCell);

			var iconCell = document.createElement("td");
			iconCell.className = "bright weather-icon";
			row.appendChild(iconCell);

			var icon = document.createElement("span");
			icon.className = forecast.icon;
			iconCell.appendChild(icon);

			var maxTempCell = document.createElement("td");
			maxTempCell.innerHTML = forecast.maxTemp;
			maxTempCell.className = "align-right bright max-temp";
			row.appendChild(maxTempCell);

			var minTempCell = document.createElement("td");
			minTempCell.innerHTML = forecast.minTemp;
			minTempCell.className = "align-right min-temp";
			row.appendChild(minTempCell);

			if (this.config.fade && this.config.fadePoint < 1) {
				if (this.config.fadePoint < 0) {
					this.config.fadePoint = 0;
				}
				var startingPoint = this.forecast.length * this.config.fadePoint;
				var steps = this.forecast.length - startingPoint;
				if (f >= startingPoint) {
					var currentStep = f - startingPoint;
					row.style.opacity = 1 - (1 / steps * currentStep);
				}
			}

		}

		return table;
	},

	/* updateWeather(compliments)
	 * Requests new data from openweather.org.
	 * Calls processWeather on succesfull response.
	 */
	updateWeather: function() {
		var url = this.config.apiBase + this.config.apiVersion + "/" + this.config.forecastEndpoint + '/' + this.getParams();
		var self = this;
		var retry = true;

		var weatherRequest = new XMLHttpRequest();
		weatherRequest.open("GET", url, true);
		weatherRequest.onreadystatechange = function() {
			if (this.readyState === 4) {
				if (this.status === 200) {
					self.processWeather(JSON.parse(this.response));
				} else if (this.status === 401) {
					self.config.appid = "";
					self.updateDom(self.config.animationSpeed);

					Log.error(self.name + ": Incorrect APPID.");
					retry = false;
				} else {
					Log.error(self.name + ": Could not load weather.");
				}

				if (retry) {
					self.scheduleUpdate((self.loaded) ? -1 : self.config.retryDelay);
				}
			}
		};
		weatherRequest.send();
	},

	/* getParams(compliments)
	 * Generates an url with api parameters based on the config.
	 *
	 * return String - URL params.
	 */
	getParams: function() {
		var params = "?";
		if(this.config.locationID !== "") {
			params += "id=" + this.config.locationID;
		} else {
			params += "q=" + this.config.location;
		}
		params += "&units=" + this.config.units;
		params += "&lang=" + this.config.lang;
		/*
		 * Submit a specific number of days to forecast, between 1 to 16 days.
		 * The OpenWeatherMap API properly handles values outside of the 1 - 16 range and returns 7 days by default.
		 * This is simply being pedantic and doing it ourselves.
		 */
		params += "&cnt=" + (((this.config.maxNumberOfDays < 1) || (this.config.maxNumberOfDays > 16)) ? 7 : this.config.maxNumberOfDays);
		params += "&APPID=" + this.config.appid;

		return params;
	},

	/* processWeather(data)
	 * Uses the received data to set the various values.
	 *
	 * argument data object - Weather information received form openweather.org.
	 */
	processWeather: function(data) {

		this.forecast = [];
		for (var i = 0, count = data.list.length; i < count; i++) {

			var forecast = data.list[i];
			this.forecast.push({

				day: moment(forecast.dt, "X").format("ddd"),
				icon: this.config.iconTable[forecast.weather[0].icon],
				maxTemp: this.roundValue(forecast.temp.max),
				minTemp: this.roundValue(forecast.temp.min)

			});
		}

		//Log.log(this.forecast);

		this.loaded = true;
		this.updateDom(this.config.animationSpeed);
	},

	/* scheduleUpdate()
	 * Schedule next update.
	 *
	 * argument delay number - Milliseconds before next update. If empty, this.config.updateInterval is used.
	 */
	scheduleUpdate: function(delay) {
		var nextLoad = this.config.updateInterval;
		if (typeof delay !== "undefined" && delay >= 0) {
			nextLoad = delay;
		}

		var self = this;
		clearTimeout(this.updateTimer);
		this.updateTimer = setTimeout(function() {
			self.updateWeather();
		}, nextLoad);
	},

	/* ms2Beaufort(ms)
	 * Converts m2 to beaufort (windspeed).
	 *
	 * argument ms number - Windspeed in m/s.
	 *
	 * return number - Windspeed in beaufort.
	 */
	ms2Beaufort: function(ms) {
		var kmh = ms * 60 * 60 / 1000;
		var speeds = [1, 5, 11, 19, 28, 38, 49, 61, 74, 88, 102, 117, 1000];
		for (var beaufort in speeds) {
			var speed = speeds[beaufort];
			if (speed > kmh) {
				return beaufort;
			}
		}
		return 12;
	},

	/* function(temperature)
	 * Rounds a temperature to 1 decimal.
	 *
	 * argument temperature number - Temperature.
	 *
	 * return number - Rounded Temperature.
	 */
	roundValue: function(temperature) {
		return parseFloat(temperature).toFixed(1);
	}
});