/**
 oEmbed Javascript, with Cohere/MALT Wiki integration.

 http://maltwiki.org/developer
 http://code.google.com/p/jquery-oembed/
*/
(function($) {
    $.fn.oembed = function(url, options) {		
	
		options = $.extend({}, $.fn.oembed.defaults, options);
		
        return this.each(function() {      
			
			var container = $(this), 
				target = (url != null) ? url : container.attr("href"), 
				provider;		
			
			if (target != null) {			
				
				provider = getOEmbedProvider(target);

				if (provider != null) {
					provider.maxWidth = options.maxWidth;
					provider.maxHeight = options.maxHeight;               
					
					provider.embedCode(target, function(code) { container.html(code); });		
				}
			}
        });
    };

    // Plugin defaults
    $.fn.oembed.defaults = {
        maxWidth: 500,
        maxHeight: 400
    };

    $.fn.oembed.getPhotoCode = function(url, data) {
//ou-specific
        var alt = data.title ? data.title : 'Photo';
        alt += data.author_name ? ', by '+data.author_name :'';
        alt += data.provider_name ? ' on '+data.provider_name :'';
        var code= '<a class="photo" href="'+ url +'"><img src="'+ data.url +'" alt="'+ alt +'" title="'+ alt +'" /></a>';
//ou-specific ends.
        if (data.html)
            code += "<div>" + data.html + "</div>";
        return code;
    };

    $.fn.oembed.getVideoCode = function(url, data) {
        var code = data.html;
        return code;
    };

    $.fn.oembed.getRichCode = function(url, data) {
        var code = data.html;
        return code;
    };

    $.fn.oembed.getGenericCode = function(url, data) {
        var title = (data.title != null) ? data.title : url,
			code = '<a href="' + url + '">' + title + '</a>';			
        if (data.html)
            code += "<div>" + data.html + "</div>";
		return code;
    };

    $.fn.oembed.isAvailable = function(url) {
        var provider = getOEmbedProvider(url);
        return (provider != null);
    };
	
    /* Private Methods */
    function getOEmbedProvider(url) {
        for (var i = 0; i < providers.length; i++) {
            if (providers[i].matches(url))
                return providers[i];
        }
        return null;
    }

    var providers = [
        new OEmbedProvider("fivemin", "5min.com"),
        new OEmbedProvider("amazon", "amazon.com"),
        new OEmbedProvider("flickr", "flickr", "http://www.flickr.com/services/oembed", "jsoncallback"),
        new OEmbedProvider("googlevideo", "video.google."),
        new OEmbedProvider("hulu", "hulu.com"),
        new OEmbedProvider("imdb", "imdb.com"),
        new OEmbedProvider("metacafe", "metacafe.com"),
        new OEmbedProvider("qik", "qik.com"),
        new OEmbedProvider("revision3", "revision3.com"), //"http://revision3.com/api/oembed" - No callback param.
        new OEmbedProvider("slideshare", "slideshare.net"),
        new OEmbedProvider("twitpic", "twitpic.com"),
        new OEmbedProvider("viddler", "viddler.com"),
        new OEmbedProvider("vimeo", "vimeo.com", "http://vimeo.com/api/oembed.json"),
        new OEmbedProvider("wikipedia", "wikipedia.org"),
        new OEmbedProvider("wordpress", "wordpress.com"),
//ou-specific,  #todo Experimental.
        new OEmbedProvider("NFB", "nfb.ca"),
        new OEmbedProvider("blip","blip.tv"),
        new OEmbedProvider("mathtran", "mathtran.org", "http://olnet.org/oembed"),
        new OEmbedProvider("cohere", "cohere.open.ac.uk", "http://olnet.org/oembed"),
        new OEmbedProvider("youtube", "youtube.com", "http://maltwiki.org/oembed")
        //new OEmbedProvider("youtube", "youtube.com")
//ou-specific ends.
    ];

    function OEmbedProvider(name, urlPattern, oEmbedUrl, callbackparameter) {
        this.name = name;
        this.urlPattern = urlPattern;
        this.oEmbedUrl = (oEmbedUrl != null) ? oEmbedUrl : "http://oohembed.com/oohembed/";
        this.callbackparameter = (callbackparameter != null) ? callbackparameter : "callback";
        this.maxWidth = 500;
        this.maxHeight = 400;

        this.matches = function(externalUrl) {
            // TODO: Convert to Regex
            return externalUrl.indexOf(this.urlPattern) >= 0;
        };

        this.getRequestUrl = function(externalUrl) {

            var url = this.oEmbedUrl;

            if (url.indexOf("?") <= 0)
                url = url + "?";

            url += "maxwidth=" + this.maxWidth + 
//ou-specific
                "&maxheight=" + this.maxHeight +
                //#todo Bug "&maxHeight=" + this.maxHeight + 
                "&client=" + "org.olnet:cohere:jquery.oembed.js" +
                "&ref=" + escape(location) +
//ou-specific ends.
                "&format=json" + 
                "&url=" + escape(externalUrl) + 
                "&" + this.callbackparameter + "=?";
            return url;
        }

        this.embedCode = function(externalUrl, embedCallback) {

            var request = this.getRequestUrl(externalUrl);

            $.getJSON(request, function(data) {
                
				var code, type = data.type;

                switch (type) {
                    case "photo":
                        code = $.fn.oembed.getPhotoCode(externalUrl, data);
                        break;
                    case "video":
                        code = $.fn.oembed.getVideoCode(externalUrl, data);
                        break;
                    case "rich":
                        code = $.fn.oembed.getRichCode(externalUrl, data);
                        break;
                    default:
                        code = $.fn.oembed.getGenericCode(externalUrl, data);
                        break;
                }

                embedCallback(code);
            });
        }
    }
})(jQuery);