/**
 * Returns the attachment object to be published to Facebook.
 *
 * @access public
 * @param  string  publish_type  The type of message to be published.
 * @param  string  game_name     The name of the game to be published.
 * @param  integer game_id       The ID of the game to be published.
 * @param  boolean is_fb_enabled A flag indicating if Facebook stuff is enabled.
 * @param  mixed   variable_data The prize won or the new high score achieved.
 * @param  boolean is_high       A flag indicating if the score is a high score.
 * @param  boolean autogen       A flag indicating if the message was autogenerated.
 * @param  string  thumb_url     The URL of the image to be used in the post.
 * @return object  A hash representing the attachment object.
 */
function getScorePublishAttachment(publish_type, game_name, game_id, is_fb_enabled, variable_data, is_high, autogen, thumb_url)
{
    // The ways we end our promo text
    var on_ww           = ' on WorldWinner.com!';
    var in_a_tournament = ' in a tournament ' + on_ww;

	// Decide whether the game name can or can not be shown.
    if (is_fb_enabled > 0)
    {
        var url = 'http://www.worldwinner.com' + '/cgi/welcome/21u9t?game_id=' + game_id + '&utm_source=facebook';

        if( publish_type == 'highscore' )
        {
            return {'name':'WorldWinner.com - Play Games, Win Cash Prizes!','caption':'{*actor*} just set a new personal best of ' + variable_data + ' in ' + game_name + on_ww,'href':url + (autogen ? '&utm_medium=autogenhighscorepost' : '&utm_medium=highscorepost') + '&utm_campaign=fbscore' ,'description':'','media':[{'type':'image','src': thumb_url,'href': url + (autogen ? '&utm_medium=autogenhighscorepost' : '&utm_medium=highscorepost') + '&utm_campaign=fbscore' }]};
        }
        else if ( publish_type == 'score' )
        {
            return {'name':'WorldWinner.com - Play Games, Win Cash Prizes!','caption':'{*actor*} just rocked a score of ' + variable_data + ' in ' + game_name + on_ww,'href': url + '&utm_medium=scorepost&utm_campaign=fbscore','description':'','media':[{'type':'image','src':thumb_url,'href': url + '&utm_medium=scorepost&utm_campaign=fbscore'}]};
        }
        else if ( publish_type == 'windropdown' )
        {
            return {'name':'WorldWinner.com - Play Games, Win Cash Prizes!','caption':'{*actor*} just won a ' + (variable_data ? variable_data + ' prize playing ' + game_name: game_name + ' tournament') + on_ww,'href': url + '&utm_medium=windropdownpost&utm_campaign=fbwin','description':'','media':[{'type':'image','src':thumb_url,'href': url + '&utm_medium=windropdownpost&utm_campaign=fbwin'}]};
        }
        else if ( publish_type == 'winstandings' )
        {
            return {'name':'WorldWinner.com - Play Games, Win Cash Prizes!','caption':'{*actor*} just won a ' + (variable_data ? variable_data + ' prize playing ' + game_name: game_name + ' tournament') + on_ww,'href': url + '&utm_medium=winstandingspost&utm_campaign=fbwin','description':'','media':[{'type':'image','src':thumb_url,'href': url + (autogen ? '&utm_medium=autogenwinpost' : '&utm_medium=winstandingspost') + '&utm_campaign=fbwin'}]};
        }
    }
    else
    {
        var url = 'http://www.worldwinner.com' + '/cgi/welcome/21u9t?utm_source=facebook';
        if( publish_type == 'highscore' )
        {
            return {'name':'WorldWinner.com - Play Games, Win Cash Prizes!','caption':'{*actor*} just snagged a new high score' + on_ww,'href':url + (autogen ? '&utm_medium=autogenhighscorepost' : '&utm_medium=highscorepost') + '&utm_campaign=fbscore' ,'description':'','media':[{'type':'image','src':thumb_url,'href': url + (autogen ? '&utm_medium=autogenhighscorepost' : '&utm_medium=highscorepost') + '&utm_campaign=fbscore' }]};
        }
        else if ( publish_type == 'score' )
        {
            return {'name':'WorldWinner.com - Play Games, Win Cash Prizes!','caption':'{*actor*} is getting in the game' + on_ww,'href': url + '&utm_medium=scorepost&utm_campaign=fbscore','description':'','media':[{'type':'image','src':thumb_url,'href': url + '&utm_medium=scorepost&utm_campaign=fbscore'}]};
        }
        else if ( publish_type == 'windropdown' )
        {
            return {'name':'WorldWinner.com - Play Games, Win Cash Prizes!','caption':'{*actor*} just ' + (variable_data ? 'won a ' + variable_data + ' prize' : 'beat the competition') + in_a_tournament,'href': url + '&utm_medium=windropdownpost&utm_campaign=fbwin','description':'','media':[{'type':'image','src':thumb_url,'href': url + '&utm_medium=windropdownpost&utm_campaign=fbwin'}]};
        }
        else if ( publish_type == 'winstandings' )
        {
            return {'name':'WorldWinner.com - Play Games, Win Cash Prizes!','caption':'{*actor*} just ' + (variable_data ? 'won a ' + variable_data + ' prize' : 'beat the competition') + in_a_tournament,'href': url + '&utm_medium=winstandingspost&utm_campaign=fbwin','description':'','media':[{'type':'image','src':thumb_url,'href': url + (autogen ? '&utm_medium=autogenwinpost' : '&utm_medium=winstandingspost') + '&utm_campaign=fbwin'}]};
        }
    }
}

/**
 * Publishes a message to the user's stream.
 *
 * @access public
 * @param  string  msg         The message to be prefilled for the user. Usually empty.
 * @param  object  attachment  The attachment object to be used for the post.
 * @param  string  action_link The URL that friends will be sent to.
 * @param  string  target      The Facebook target account. Usually null.
 * @param  string  prompt      The message prompt
 * @param  string  share_type  The type of sharing being done.
 * @return void
 */
function callScorePublish(msg, attachment, action_link, target, prompt, share_type) {
    FB.getLoginStatus(function(response) {
        // Users that are logged in and have a connection with WW have a status of 
        // connected. Users that are logged in and do not haev a connection with WW
        // have a status of notConnected. Users that are not logged in have a status
        // of unknown.
        if (response.status != 'unknown') {
            publishScore(msg, attachment, action_link, target, prompt, share_type);
        } else {
            // Prompt the user to log in. We do this explicitly because if we don't,
            // Facebook will redirect the user to login and (re-)url encode the url.
            // This leads to ridiculously long URLs that IE cannot handle. By 
            // explicitly forcing the user to login and then post, we can avoid
            // crazy URLs.
            FB.login(function(response) {
                if (response.session) {
                    // Now that they have logged in, call this again.
                    publishScore(msg, attachment, action_link, target, prompt, share_type);
                } else {
                    // User cancelled login or would not allow us to publish.
                    handlePublishResults(response, prompt, share_type);
                }
            });
        }
    });

    return;
}

/**
 * Provides the user with an opportunity to publish our message to their Facebook
 * account.
 *
 * @access public
 * @param  string  msg         The message to be prefilled for the user. Usually empty.
 * @param  object  attachment  The attachment object to be used for the post.
 * @param  string  action_link The URL that friends will be sent to.
 * @param  string  target      The Facebook target account. Usually null.
 * @param  string  prompt      The message prompt
 * @param  string  share_type  The type of sharing being done.
 * @return void
 */
function publishScore(msg, attachment, action_link, target, prompt, share_type)
{
    // Publish a message to the user's stream.
    FB.ui({method:              'stream.publish',
           message:             msg,
           attachment:          attachment,
           action_links:        action_link,
           user_message_prompt: prompt
           },
           function(response) {
               handlePublishResults(response, prompt, share_type);
           });
}

/**
 * Tracks the user's action in our analytics tracker.
 *
 * @param  object  response   The response object from a Facebook API call.
 * @param  string  prompt     The message prompt
 * @param  string  share_type The type of sharing being done.
 * @return void
 */
function handlePublishResults(response, prompt, share_type) {
    if (typeof pageTracker != 'undefined') {
        if (response && response.post_id) {
            // After we publish, we want to fire a call to GA to track this event.
            // Checking specifically for post_id indicates that it's a successful
            // submission.
            pageTracker._trackEvent('Facebook', share_type);
        } else {
            // If there's no post_id, there's no post to facebook.
            pageTracker._trackEvent('Facebook', 'Submission Cancelled');
        }
    }

    $j('span#fb_dialog_header').text(prompt);
}