/*
 * jquery-ujs
 *
 * http://github.com/rails/jquery-ujs/blob/master/src/rails.js
 *
 * This rails.js file supports jQuery 1.4.3 and 1.4.4 .
 *
 */ 

jQuery(function ($) {
    var csrf_token = $('meta[name=csrf-token]').attr('content'),
        csrf_param = $('meta[name=csrf-param]').attr('content');

    $.fn.extend({
        /**
         * Triggers a custom event on an element and returns the event result
         * this is used to get around not being able to ensure callbacks are placed
         * at the end of the chain.
         *
         * TODO: deprecate with jQuery 1.4.2 release, in favor of subscribing to our
         *       own events and placing ourselves at the end of the chain.
         */
        triggerAndReturn: function (name, data) {
            var event = new $.Event(name);
            this.trigger(event, data);

            return event.result !== false;
        },

        /**
         * Handles execution of remote calls. Provides following callbacks:
         *
         * - ajax:before   - is execute before the whole thing begings
         * - ajax:loading  - is executed before firing ajax call
         * - ajax:success  - is executed when status is success
         * - ajax:complete - is execute when status is complete
         * - ajax:failure  - is execute in case of error
         * - ajax:after    - is execute every single time at the end of ajax call 
         */
        callRemote: function () {
            var el      = this,
                method  = el.attr('method') || el.attr('data-method') || 'GET',
                url     = el.attr('action') || el.attr('href'),
                dataType  = el.attr('data-type')  || ($.ajaxSettings && $.ajaxSettings.dataType);

            if (url === undefined) {
                throw "No URL specified for remote call (action or href must be present).";
            } else {
                if (el.triggerAndReturn('ajax:before')) {
                    var data = el.is('form') ? el.serializeArray() : [];
                    $.ajax({
                        url: url,
                        data: data,
                        dataType: dataType,
                        type: method.toUpperCase(),
                        beforeSend: function (xhr) {
                            el.trigger('ajax:loading', xhr);
                        },
                        success: function (data, status, xhr) {
                            el.trigger('ajax:success', [data, status, xhr]);
                        },
                        complete: function (xhr) {
                            el.trigger('ajax:complete', xhr);
                        },
                        error: function (xhr, status, error) {
                            el.trigger('ajax:failure', [xhr, status, error]);
                        }
                    });
                }

                el.trigger('ajax:after');
            }
        }
    });

    /**
     *  confirmation handler
     */

    $('body').delegate('a[data-confirm], button[data-confirm], input[data-confirm]', 'click.rails', function () {
        var el = $(this);
        if (el.triggerAndReturn('confirm')) {
            if (!confirm(el.attr('data-confirm'))) {
                return false;
            }
        }
    });
  


    /**
     * remote handlers
     */
    $('form[data-remote]').live('submit.rails', function (e) {
        $(this).callRemote();
        e.preventDefault();
    });

    $('a[data-remote],input[data-remote]').live('click.rails', function (e) {
        $(this).callRemote();
        e.preventDefault();
    });

    $('a[data-method]:not([data-remote])').live('click.rails', function (e){
        var link = $(this),
            href = link.attr('href'),
            method = link.attr('data-method'),
            form = $('<form method="post" action="'+href+'"></form>'),
            metadata_input = '<input name="_method" value="'+method+'" type="hidden" />';

        if (csrf_param !== undefined && csrf_token !== undefined) {
            metadata_input += '<input name="'+csrf_param+'" value="'+csrf_token+'" type="hidden" />';
        }

        form.hide()
            .append(metadata_input)
            .appendTo('body');

        e.preventDefault();
        form.submit();
    });

    /**
     * disable-with handlers
     */
    var disable_with_input_selector           = 'input[data-disable-with]',
        disable_with_form_remote_selector     = 'form[data-remote]:has('       + disable_with_input_selector + ')',
        disable_with_form_not_remote_selector = 'form:not([data-remote]):has(' + disable_with_input_selector + ')';

    var disable_with_input_function = function () {
        $(this).find(disable_with_input_selector).each(function () {
            var input = $(this);
            input.data('enable-with', input.val())
                .attr('value', input.attr('data-disable-with'))
                .attr('disabled', 'disabled');
        });
    };

    $(disable_with_form_remote_selector).live('ajax:before.rails', disable_with_input_function);
    $(disable_with_form_not_remote_selector).live('submit.rails', disable_with_input_function);

    $(disable_with_form_remote_selector).live('ajax:complete.rails', function () {
        $(this).find(disable_with_input_selector).each(function () {
            var input = $(this);
            input.removeAttr('disabled')
                 .val(input.data('enable-with'));
        });
    });

    var jqueryVersion = $().jquery;

    if ( (jqueryVersion === '1.4') || (jqueryVersion === '1.4.1') || (jqueryVersion === '1.4.2') ){
        alert('This rails.js does not support the jQuery version you are using. Please read documentation.');
    }

});