/**
 * Plugin: jquery.zWeatherFeed
 *
 * Version: 1.2.1
 * (c) Copyright 2011-2013, Zazar Ltd
 *
 * Description: jQuery plugin for display of Yahoo! Weather feeds
 *
 * History:
 * 1.2.1 - Handle invalid locations
 * 1.2.0 - Added forecast data option
 * 1.1.0 - Added user callback function
 *         New option to use WOEID identifiers
 *         New day/night CSS class for feed items
 *         Updated full forecast link to feed link location
 * 1.0.3 - Changed full forecast link to Weather Channel due to invalid Yahoo! link
 Add 'linktarget' option for forecast link
 * 1.0.2 - Correction to options / link
 * 1.0.1 - Added hourly caching to YQL to avoid rate limits
 *         Uses Weather Channel location ID and not Yahoo WOEID
 *         Displays day or night background images
 *
 **/

(function ($) {

    $.fn.weatherfeed = function (locations, options, fn) {

        // Set plugin defaults
        var defaults = {
            unit: 'c',
            image: true,
            country: false,
            highlow: true,
            wind: true,
            humidity: false,
            visibility: false,
            sunrise: false,
            sunset: false,
            forecast: false,
            link: true,
            showerror: true,
            linktarget: '_self',
            woeid: false
        };
        var options = $.extend(defaults, options);
        var row = 'odd';

        // Functions
        return this.each(function (i, e) {
            var $e = $(e);

            // Add feed class to user div
            if (!$e.hasClass('weatherFeed')) $e.addClass('weatherFeed');

            // Check and append locations
            if (!$.isArray(locations)) return false;

            var count = locations.length;
            if (count > 10) count = 10;

            var locationid = '';

            for (var i = 0; i < count; i++) {
                if (locationid != '') locationid += ',';
                locationid += "'" + locations[i] + "'";
            }

            // Cache results for an hour to prevent overuse
            now = new Date();

            // Select location ID type
            var queryType = options.woeid ? 'woeid' : 'location';

            // Create Yahoo Weather feed API address
            var query = "select * from weather.forecast where " + queryType + " in (" + locationid + ") and u='" + options.unit + "'";
            var api = 'http://query.yahooapis.com/v1/public/yql?q=' + encodeURIComponent(query) + '&rnd=' + now.getFullYear() + now.getMonth() + now.getDay() + now.getHours() + '&format=json&callback=?';

            // Send request
            $.ajax({
                type: 'GET',
                url: api,
                dataType: 'json',
                success: function (data) {

                    if (data.query) {

                        if (data.query.results.channel.length > 0) {

                            // Multiple locations
                            var result = data.query.results.channel.length;
                            for (var i = 0; i < result; i++) {

                                // Create weather feed item
                                _process(e, data.query.results.channel[i], options);
                            }
                        } else {

                            // Single location only
                            _process(e, data.query.results.channel, options);
                        }

                        // Optional user callback function
                        if ($.isFunction(fn)) fn.call(this, $e);

                    } else {
                        if (options.showerror) $e.html('<p>Weather information unavailable</p>');
                    }
                },
                error: function (data) {
                    if (options.showerror) $e.html('<p>Weather request failed</p>');
                }
            });

            // Function to each feed item
            var _process = function (e, feed, options) {
                var $e = $(e);

                // Check for invalid location
                if (feed.description != 'Yahoo! Weather Error') {

                    // Format feed items
                    var wd = feed.wind.direction;
                    if (wd >= 348.75 && wd <= 360) {
                        wd = "N"
                    }
                    ;
                    if (wd >= 0 && wd < 11.25) {
                        wd = "N"
                    }
                    ;
                    if (wd >= 11.25 && wd < 33.75) {
                        wd = "NNE"
                    }
                    ;
                    if (wd >= 33.75 && wd < 56.25) {
                        wd = "NE"
                    }
                    ;
                    if (wd >= 56.25 && wd < 78.75) {
                        wd = "ENE"
                    }
                    ;
                    if (wd >= 78.75 && wd < 101.25) {
                        wd = "E"
                    }
                    ;
                    if (wd >= 101.25 && wd < 123.75) {
                        wd = "ESE"
                    }
                    ;
                    if (wd >= 123.75 && wd < 146.25) {
                        wd = "SE"
                    }
                    ;
                    if (wd >= 146.25 && wd < 168.75) {
                        wd = "SSE"
                    }
                    ;
                    if (wd >= 168.75 && wd < 191.25) {
                        wd = "S"
                    }
                    ;
                    if (wd >= 191.25 && wd < 213.75) {
                        wd = "SSW"
                    }
                    ;
                    if (wd >= 213.75 && wd < 236.25) {
                        wd = "SW"
                    }
                    ;
                    if (wd >= 236.25 && wd < 258.75) {
                        wd = "WSW"
                    }
                    ;
                    if (wd >= 258.75 && wd < 281.25) {
                        wd = "W"
                    }
                    ;
                    if (wd >= 281.25 && wd < 303.75) {
                        wd = "WNW"
                    }
                    ;
                    if (wd >= 303.75 && wd < 326.25) {
                        wd = "NW"
                    }
                    ;
                    if (wd >= 326.25 && wd < 348.75) {
                        wd = "NNW"
                    }
                    ;
                    var wf = feed.item.forecast[0];

                    // Determine day or night image
                    wpd = feed.item.pubDate;
                    n = wpd.indexOf(":");
                    tpb = _getTimeAsDate(wpd.substr(n - 2, 8));
                    tsr = _getTimeAsDate(feed.astronomy.sunrise);
                    tss = _getTimeAsDate(feed.astronomy.sunset);

                    // Get night or day
                    if (tpb > tsr && tpb < tss) {
                        daynight = 'day';
                    } else {
                        daynight = 'night';
                    }

                    // Add item container
                    var html = '<div class="weatherItem ' + row + ' ' + daynight + '"';
                    if (options.image) html += ' style="background-image: url(http://l.yimg.com/a/i/us/nws/weather/gr/' + feed.item.condition.code + daynight.substring(0, 1) + '.png); background-repeat: no-repeat;"';
                    html += '>';

                    // Add item data
                    html += '<div class="weatherCity">' + feed.location.city + '</div>';
                    if (options.country) html += '<div class="weatherCountry">' + feed.location.country + '</div>';
                    html += '<div class="weatherTemp">' + feed.item.condition.temp + '&deg;</div>';
                    html += '<div class="weatherDesc">' + feed.item.condition.text + '</div>';

                    // Add optional data
                    if (options.highlow) html += '<div class="weatherRange">High: ' + wf.high + '&deg; Low: ' + wf.low + '&deg;</div>';
                    if (options.wind) html += '<div class="weatherWind">Wind: ' + wd + ' ' + feed.wind.speed + feed.units.speed + '</div>';
                    if (options.humidity) html += '<div class="weatherHumidity">Humidity: ' + feed.atmosphere.humidity + '</div>';
                    if (options.visibility) html += '<div class="weatherVisibility">Visibility: ' + feed.atmosphere.visibility + '</div>';
                    if (options.sunrise) html += '<div class="weatherSunrise">Sunrise: ' + feed.astronomy.sunrise + '</div>';
                    if (options.sunset) html += '<div class="weatherSunset">Sunset: ' + feed.astronomy.sunset + '</div>';

                    // Add item forecast data
                    if (options.forecast) {

                        html += '<div class="weatherForecast">';

                        var wfi = feed.item.forecast;

                        for (var i = 0; i < wfi.length; i++) {
                            html += '<div class="weatherForecastItem" style="background-image: url(http://l.yimg.com/a/i/us/nws/weather/gr/' + wfi[i].code + 's.png); background-repeat: no-repeat;">';
                            html += '<div class="weatherForecastDay">' + wfi[i].day + '</div>';
                            html += '<div class="weatherForecastDate">' + wfi[i].date + '</div>';
                            html += '<div class="weatherForecastText">' + wfi[i].text + '</div>';
                            html += '<div class="weatherForecastRange">High: ' + wfi[i].high + ' Low: ' + wfi[i].low + '</div>';
                            html += '</div>'
                        }

                        html += '</div>'
                    }

                    if (options.link) html += '<div class="weatherLink"><a href="' + feed.link + '" target="' + options.linktarget + '" title="Read full forecast">Full forecast</a></div>';

                } else {
                    var html = '<div class="weatherItem ' + row + '">';
                    html += '<div class="weatherError">City not found</div>';
                }

                html += '</div>';

                // Alternate row classes
                if (row == 'odd') {
                    row = 'even';
                } else {
                    row = 'odd';
                }

                $e.append(html);
            };

            // Get time string as date
            var _getTimeAsDate = function (t) {

                d = new Date();
                r = new Date(d.toDateString() + ' ' + t);

                return r;
            };

        });
    };

})(jQuery);