String.prototype.endsWith = function(str) {return (this.match(str+"$")==str)}

window.Facebook = {
    loginFailedMessage: 'Login failed.',
    redirectUrl: '/',

    Login: function (callback) 
    {
        return FB.getLoginStatus(function (response) 
        {
            var cb;

            if (response.status === 'connected') 
            {
                return Facebook.GetUserData(callback);
            }
            else 
            {
                cb = function (resp) 
                {
                    if (!resp.authResponse) 
                    {
                        Facebook.ShowError();
                        return;
                    }
                    return Facebook.GetUserData(callback);
                };
                return FB.login(cb, {
                    scope: "email"
                });
            }
        });
    },
    GetUserData: function (callback) 
    {
        FB.api('/me', function (user) 
        {
            var session;
            if (!user)
             {
                Facebook.ShowError();
                return;
            }
            if (user.error != null) 
            {
                Facebook.ShowError();
                return;
            }

            session = FB.getAuthResponse();

            if (!(session && session.accessToken)) 
            {
                Facebook.ShowError();
            }

            return callback(user, session);
        });
    },
    LoginSucceeded: function (state) 
    {
        if (state == 0) 
        {
            if (Facebook.redirectUrl.length === 0) 
            {
                top.location.reload();
            }
            else if (Facebook.redirectUrl.endsWith('.zip') || Facebook.redirectUrl.endsWith('.rar')) 
            {
                top.location = Facebook.redirectUrl;
                window.setTimeout(function () 
                {
                    top.location.reload();
                }, 300);
            }
            else
            {
                top.location = Facebook.redirectUrl;
            }
        }
        else 
        {
            Facebook.ShowError();
        }
    },
    ShowError: function () 
    {
        return alert(Facebook.loginFailedMessage);
    }
};

$(function () 
{
    var callback = function (user, session) 
    {
        return SilverlightShow.Services.FacebookLogin.LoginUser(user.first_name, user.last_name, user.email, session.accessToken, Facebook.LoginSucceeded);
    };

    $('a.facebook-login-button').live('click', function () 
    {
        return Facebook.Login(callback);
    });
});