// TODO: confirm
// TODO: popup
// TODO: disable_with
jQuery(function ($) {
    var rails = {
        update: function (selector, content, position) {
            var element = selector.charAt(0) == '#' ? selector : '#' + selector;
            if (position) {
                switch (position) {
                    case "before":
                        $(element).before(content); 
                        break;
                    case "after":
                        $(element).after(content); 
                        break;
                    case "top":
                        $(element).prepend(content); 
                        break;
                    case "bottom":
                        $(element).append(content); 
                        break;
                    default:
                        $(element).append(content); 
                        break;
                }
            } else {
                $(element).html(content); 
            }
        },
        remote: function (e) {
            var el          = $(this),
                data        = [],
                condition   = el.attr('data-condition') ? eval(el.attr('data-condition')) : true,
                method      = el.attr('method') || el.attr('data-method') || 'GET',
                url         = el.attr('action') || el.attr('data-url') || '#',
                async       = el.attr('data-remote-type') === 'synchronous' ? false : true;

            if (el.attr('data-submit')) {
                data = $('#' + el.attr('data-submit')).serializeArray();
            } else if (el.attr('data-with')) {
                data = el.attr('data-with');
            } else if (e && e.target.tagName.toUpperCase() == 'FORM') {
                data = el.serializeArray();
            } else if (e && e.target.tagName.toUpperCase() == 'INPUT') {
                data = el.closest('form').serializeArray();
            }

            if (condition) {
                el.trigger('rails:before');
                
                $.ajax({
                    async: async,
                    url: url,
                    data: data,
                    type: method.toUpperCase(),
                    beforeSend: function (xhr) {
                        el.trigger('rails:after', xhr);
                        el.trigger('rails:loading', xhr);
                    },
                    success: function (data, status, xhr) {
                        el.trigger('rails:success', [data, status, xhr]);
                        if (el.attr('data-update-success')) {
                           rails.update(el.attr('data-update-success'), data, el.attr('data-update-position')); 
                        }
                    },
                    complete: function (xhr) {
                        el.trigger('rails:complete', xhr);
                        el.trigger('rails:loaded', xhr);
                    },
                    error: function (xhr, status, error) {
                        el.trigger('rails:failure', [xhr, status, error]);
                        if (el.attr('data-update-failure')) {
                           rails.update(el.attr('data-update-failure'), data, el.attr('data-update-position')); 
                        }
                    }
                });
            }
            e.preventDefault();
        }
    }

    /**
     * observe_form, and observe_field
     */
    $('script[data-observe="true"]').each(function (index, el) {
        // TODO: hook to onchange event of field or form being observed
    });

    /**
     * periodically_call_remote
     */
    $('script[data-periodical="true"]').each(function (index, e) {
        var el          = $(e),
            frequency   = el.attr('data-frequency') ? el.attr('data-frequency') : 10,
            remote      = function() {
                var event = new jQuery.Event('periodical');
                event.target = e;

                rails.remote.call(el, event);
            };

        setInterval(remote, frequency * 1000);
    });

    /**
     * remote_form_tag, and remote_form_for
     */
    $('form[data-remote="true"]').live('submit', rails.remote);

    /**
     * link_to_remote, button_to_remote, and submit_to_remote
     */
    $('a[data-remote="true"],input[data-remote="true"],input[data-remote-submit="true"]').live('click', rails.remote);
   

    /**
     *
     * Rails 2.x Helper / Event Handlers
     * By default we listen to all callbacks, and status code callbacks and
     * check the element for data-<callback> attribute and eval it.
     *
     */
    rails.compat = {
        evalAttribute: function (element, attribute) {
            var el = $(element),
                attr = el.attr('data-' + attribute);
            return (attr) ? eval(attr) : true;
        }
    };

    $('form[data-remote="true"],a[data-remote="true"],input[data-remote="true"]')
        .live('rails:before', function (e) {
            rails.compat.evalAttribute(this, 'onbefore'); 
        })
        .live('rails:after', function (e, xhr) {
            rails.compat.evalAttribute(this, 'onafter'); 
        })
        .live('rails:loading', function (e, xhr) {
            rails.compat.evalAttribute(this, 'onloading'); 
        })
        .live('rails:loaded', function (e, xhr) {
            rails.compat.evalAttribute(this, 'onloaded'); 
        })
        .live('rails:complete', function (e, xhr) {
            rails.compat.evalAttribute(this, 'oncomplete'); 
            rails.compat.evalAttribute(this, 'on' + xhr.status); 
        })
        .live('rails:success', function (e, data, status, xhr) {
            rails.compat.evalAttribute(this, 'onsuccess'); 
        })
        .live('rails:failure', function (e, xhr, status, error) {
            rails.compat.evalAttribute(this, 'onfailure'); 
        });
});