/*
Class: flickr.FlickrFeed
    Fetches feed data from Flickr photo streams

Extends:
    <Feed>

License:
    MIT-style license.

Copyright:
    Copyright (c) 2010 explore.travellr.com

Dependencies:
   - <MooTools::core> 1.2.4 or higher
   - <MooTools::more> 1.2.4.4 RC1 or higher
   - <MooTools::more> Request.JSONP
   - <flickr.FlickrFeedItem>
*/

var FlickrFeed = new Class({

    Implements: [Options, Events],
	
    Extends: Feed,

    /**
     * Variable: name
     * The name of this <Feed>, for use in the GUI
     */
    name: 'Flickr',
	
    /**
     * Variable: perPage
     * The maximum number of photos displayed
     */
    perPage: 10,

    /**
     * Variable: page
     * The page number of the current search. Incremented every search
     */
    page: 1,

    /**
     * Variable: options
     * A <JS::Object> containing options for <FlickrFeeds>
     *
     *   size - The size of the content image
     *   method - The API method to call to search images
     *   apikey - The Flickr API key to use
     */
    options: {
        size: 'm',
        method: 'flickr.photos.search',
        apikey: '49dbf1eebc2e9dd4ae02a97d074d83fc'
    },

    /**
     * Function: newSearch
     * Reset variables and what not ready for a new search
     *
     * Parameters:
     *     searchFilter - The search filter to filter new results with
     */
    newSearch: function(searchFilter) {
        this.parent();
        this.searchFilter = searchFilter;
        this.page = 1;
    },

    /**
     * Function: getMoreFeedItems
     * Search the feed for items relating to the search terms. Calls
     * makeFeedItems on success.
     */
    getMoreFeedItems: function() {
        var tags = [];
        var groups = [
            "642578@N20", "651467@N20", "95408346@N00","642578@N20",
            "651467@N20", "95408346@N00", "1054980@N25", "80235331@N00",
            "64181070@N00", "391332@N25", "616189@N23", "633730@N24",
            "16984497@N00", "376701@N20", "342614@N21", "23966700@N00",
            "62583794@N00", "364018@N23", "63655619@N00", "16816761@N00",
            "338125@N24", "74744754@N00", "62647754@N00", "81913447@N00",
            "598803@N20", "43186709@N00", "1124795@N23", "651467@N20",
            "11488522@N00", "294286@N25", "631401@N25", "46306708@N00",
            "34355725@N02", "21776702@N07", "46306708@N00", "55323305@N00",
            "88923587@N00", "46306708@N00", "45839300@N00", "63004124@N00",
            "52838144@N00", "48227644@N00", "44346430@N00", "11806675@N00",
            "32356708@N05", "44124303046@N01", "52240442714@N01", "38531420@N00",
            "352933@N20", "88145536@N00", "666749@N24", "844972@N25",
            "79091893@N00", "462501@N21", "406846@N25", "463434@N25",
            "40285293@N00", "68067310@N00", "339018@N21", "70793332@N00",
            "17456965@N00", "376701@N20", "48926546@N00", "95408346@N00",
            "64228671@N00", "46306708@N00", "642578@N20", "1425956@N00",
            "97947309@N00", "13433297@N00", "77091372@N00", "979035@N25",
            "78336205@N00", "60853857@N00", "99936649@N00", "81913447@N00"
        ];

        (this.searchFilter.tags || []).each(function(tag) {
            tags.push(tag.name);
        });
        tags = tags.join(',');

        new Request.JSONP({
            url: 'http://api.flickr.com/services/rest/',
            data: {
                api_key:  this.options.apikey,
                method:   this.options.method,
                page:     this.page,
                per_page: this.perPage,
                tags:     tags,
                woe_id:   (this.searchFilter.location ? this.searchFilter.location.woe_id : null),
                format:   'json',
                sort:     'relevance',
                group_id: groups
            },
            callbackKey: 'jsoncallback',
            onSuccess: this.makeFeedItems.bind(this),
            onFailure: (function() {
                this.moreFeedItems = false;
                this.feedItemsReady();
            }).bind(this)
        }).send();
        this.page = this.page + 1;
    },

    /**
     * Function: makeFeedItems
     * Makes the individual <FlickrFeedItems> by sending the each photo
     * object of the response object to the <FlickrFeedItem> class and then
     * pushing each of them onto the <Feed::feedItems> array
     *
     * Parameters:
     *     response - object returned by the flickr call
     */
    makeFeedItems: function(response) {
        this.response = response.photos ? response.photos.photo : false;

        if(this.response) {
            this.response.each(function(data) {
                var feedItem = new FlickrFeedItem(data);
                this.feedItems.push(feedItem);
            }, this);
        }
        this.moreFeedItems = this.response && this.response.length == this.perPage;

        this.feedItemsReady();
    }
});