/**
 * Plugin: jquery.zWeatherFeed
 * 
 * Version: 1.0.2
 * (c) Copyright 2010, Zazar Ltd
 * 
 * Description: jQuery plugin for display of Yahoo! Weather feeds
 * 
 * History:
 * 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 ($) {

    var row = 'odd';

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

        // Set pluign defaults
        var defaults = {
            unit: 'f',
            image: true,
            highlow: true,
            wind: true,
            link: true,
            showerror: true
        };
        var options = $.extend(defaults, options);

        // 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()

            // Create Yahoo Weather feed API address
            //Original Code
            //var query = "select * from weather.forecast where location 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=?';

            //Start Code chagnes
            //attempts to use user's city
            //var new_query = "select * from weather.forecast where location in (select id from xml where url='http://xoap.weather.com/search/search?where=Washington,DC' and itemPath='search.loc') and u='" + options.unit + "'";
            var new_query = "select * from weather.forecast where location in (select id from xml where url='http://xoap.weather.com/search/search?where=" + encodeURIComponent(locationid) + "' and itemPath='search.loc') and u='" + options.unit + "' limit 1";
            var api = 'http://query.yahooapis.com/v1/public/yql?q=' + encodeURIComponent(new_query) + '&rnd=' + now.getFullYear() + now.getMonth() + now.getDay() + now.getHours() + '&format=json&callback=?';

            // Send request
            //$.getJSON(api, function(data) {
            $.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
                                _callback(e, data.query.results.channel[i], options);
                            }
                        } else {

                            // Single location only
                            _callback(e, data.query.results.channel, options);
                        }
                    } else {
                        if (options.showerror) $e.html('<p>Weather information unavailable</p><p>' + api + '</p>');
                    }
                },
                error: function (data) {
                    if (options.showerror) $e.html('<p>Weather request failed</p><p>' + api + '</p>');
                }
            });

        });
    };

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

        // 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);

        if (tpb > tsr && tpb < tss) { daynight = 'd'; } else { daynight = 'n'; }

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

        // Add item data
        html += '<div class="weatherCity">' + feed.location.city + ', ' + feed.location.region + '</div>';
        html += '<div class="weatherTemp">' + feed.item.condition.temp + '&deg;</div>';
        html += '<div class="weatherDesc">' + feed.item.condition.text + '</div>';
        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.link) html += '<div class="weatherLink"><a href="' + feed.item.link + '">Read full forecast</a></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);