/**
 * Yii JavaScript module.
 *
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */

/**
 * yii is the root module for all Yii JavaScript modules.
 * It implements a mechanism of organizing JavaScript code in modules through the function "yii.initModule()".
 *
 * Each module should be named as "x.y.z", where "x" stands for the root module (for the Yii core code, this is "yii").
 *
 * A module may be structured as follows:
 *
 * ```javascript
 * yii.sample = (function($) {
 *     var pub = {
 *         // whether this module is currently active. If false, init() will not be called for this module
 *         // it will also not be called for all its child modules. If this property is undefined, it means true.
 *         isActive: true,
 *         init: function() {
 *             // ... module initialization code go here ...
 *         },
 *
 *         // ... other public functions and properties go here ...
 *     };
 *
 *     // ... private functions and properties go here ...
 *
 *     return pub;
 * })(jQuery);
 * ```
 *
 * Using this structure, you can define public and private functions/properties for a module.
 * Private functions/properties are only visible within the module, while public functions/properties
 * may be accessed outside of the module. For example, you can access "yii.sample.isActive".
 *
 * You must call "yii.initModule()" once for the root module of all your modules.
 */
window.yii = (function ($) {
    var pub = {
        /**
         * List of JS or CSS URLs that can be loaded multiple times via AJAX requests.
         * Each item may be represented as either an absolute URL or a relative one.
         * Each item may contain a wildcart matching character `*`, that means one or more
         * any characters on the position. For example:
         *  - `/css/*.js` will match any file ending with `.js` in the `css` directory of the current web site
         *  - `http*://cdn.example.com/*` will match any files on domain `cdn.example.com`, loaded with HTTP or HTTPS
         *  - `/js/myCustomScript.js?realm=*` will match file `/js/myCustomScript.js` with defined `realm` parameter
         */
        reloadableScripts: [],
        /**
         * The selector for clickable elements that need to support confirmation and form submission.
         */
        clickableSelector: 'a, button, input[type="submit"], input[type="button"], input[type="reset"], input[type="image"]',
        /**
         * The selector for changeable elements that need to support confirmation and form submission.
         */
        changeableSelector: 'select, input, textarea',

        /**
         * @return string|undefined the CSRF parameter name. Undefined is returned if CSRF validation is not enabled.
         */
        getCsrfParam: function () {
            return $('meta[name=csrf-param]').attr('content');
        },

        /**
         * @return string|undefined the CSRF token. Undefined is returned if CSRF validation is not enabled.
         */
        getCsrfToken: function () {
            return $('meta[name=csrf-token]').attr('content');
        },

        /**
         * Sets the CSRF token in the meta elements.
         * This method is provided so that you can update the CSRF token with the latest one you obtain from the server.
         * @param name the CSRF token name
         * @param value the CSRF token value
         */
        setCsrfToken: function (name, value) {
            $('meta[name=csrf-param]').attr('content', name);
            $('meta[name=csrf-token]').attr('content', value);
        },

        /**
         * Updates all form CSRF input fields with the latest CSRF token.
         * This method is provided to avoid cached forms containing outdated CSRF tokens.
         */
        refreshCsrfToken: function () {
            var token = pub.getCsrfToken();
            if (token) {
                $('form input[name="' + pub.getCsrfParam() + '"]').val(token);
            }
        },

        /**
         * Displays a confirmation dialog.
         * The default implementation simply displays a js confirmation dialog.
         * You may override this by setting `yii.confirm`.
         * @param message the confirmation message.
         * @param ok a callback to be called when the user confirms the message
         * @param cancel a callback to be called when the user cancels the confirmation
         */
        confirm: function (message, ok, cancel) {
            if (confirm(message)) {
                !ok || ok();
            } else {
                !cancel || cancel();
            }
        },

        /**
         * Handles the action triggered by user.
         * This method recognizes the `data-method` attribute of the element. If the attribute exists,
         * the method will submit the form containing this element. If there is no containing form, a form
         * will be created and submitted using the method given by this attribute value (e.g. "post", "put").
         * For hyperlinks, the form action will take the value of the "href" attribute of the link.
         * For other elements, either the containing form action or the current page URL will be used
         * as the form action URL.
         *
         * If the `data-method` attribute is not defined, the `href` attribute (if any) of the element
         * will be assigned to `window.location`.
         *
         * Starting from version 2.0.3, the `data-params` attribute is also recognized when you specify
         * `data-method`. The value of `data-params` should be a JSON representation of the data (name-value pairs)
         * that should be submitted as hidden inputs. For example, you may use the following code to generate
         * such a link:
         *
         * ```php
         * use yii\helpers\Html;
         * use yii\helpers\Json;
         *
         * echo Html::a('submit', ['site/foobar'], [
         *     'data' => [
         *         'method' => 'post',
         *         'params' => [
         *             'name1' => 'value1',
         *             'name2' => 'value2',
         *         ],
         *     ],
         * ];
         * ```
         *
         * @param $e the jQuery representation of the element
         */
        handleAction: function ($e, event) {
            var $form = $e.attr('data-form') ? $('#' + $e.attr('data-form')) : $e.closest('form'),
                method = !$e.data('method') && $form ? $form.attr('method') : $e.data('method'),
                action = $e.attr('href'),
                params = $e.data('params'),
                pjax = $e.data('pjax') || 0,
                pjaxPushState = !!$e.data('pjax-push-state'),
                pjaxReplaceState = !!$e.data('pjax-replace-state'),
                pjaxTimeout = $e.data('pjax-timeout'),
                pjaxScrollTo = $e.data('pjax-scrollto'),
                pjaxPushRedirect = $e.data('pjax-push-redirect'),
                pjaxReplaceRedirect = $e.data('pjax-replace-redirect'),
                pjaxSkipOuterContainers = $e.data('pjax-skip-outer-containers'),
                pjaxContainer,
                pjaxOptions = {};

            if (pjax !== 0 && $.support.pjax) {
                if ($e.data('pjax-container')) {
                    pjaxContainer = $e.data('pjax-container');
                } else {
                    pjaxContainer = $e.closest('[data-pjax-container=""]');
                }
                // default to body if pjax container not found
                if (!pjaxContainer.length) {
                    pjaxContainer = $('body');
                }
                pjaxOptions = {
                    container: pjaxContainer,
                    push: pjaxPushState,
                    replace: pjaxReplaceState,
                    scrollTo: pjaxScrollTo,
                    pushRedirect: pjaxPushRedirect,
                    replaceRedirect: pjaxReplaceRedirect,
                    pjaxSkipOuterContainers: pjaxSkipOuterContainers,
                    timeout: pjaxTimeout,
                    originalEvent: event,
                    originalTarget: $e
                }
            }

            if (method === undefined) {
                if (action && action != '#') {
                    if (pjax !== 0 && $.support.pjax) {
                        $.pjax.click(event, pjaxOptions);
                    } else {
                        window.location = action;
                    }
                } else if ($e.is(':submit') && $form.length) {
                    if (pjax !== 0 && $.support.pjax) {
                        $form.on('submit',function(e){
                            $.pjax.submit(e, pjaxOptions);
                        })
                    }
                    $form.trigger('submit');
                }
                return;
            }

            var newForm = !$form.length;
            if (newForm) {
                if (!action || !/(^\/|:\/\/)/.test(action)) {
                    action = window.location.href;
                }
                $form = $('<form/>', {method: method, action: action});
                var target = $e.attr('target');
                if (target) {
                    $form.attr('target', target);
                }
                if (!/(get|post)/i.test(method)) {
                    $form.append($('<input/>', {name: '_method', value: method, type: 'hidden'}));
                    method = 'POST';
                }
                if (!/(get|head|options)/i.test(method)) {
                    var csrfParam = pub.getCsrfParam();
                    if (csrfParam) {
                        $form.append($('<input/>', {name: csrfParam, value: pub.getCsrfToken(), type: 'hidden'}));
                    }
                }
                $form.hide().appendTo('body');
            }

            var activeFormData = $form.data('yiiActiveForm');
            if (activeFormData) {
                // remember who triggers the form submission. This is used by yii.activeForm.js
                activeFormData.submitObject = $e;
            }

            // temporarily add hidden inputs according to data-params
            if (params && $.isPlainObject(params)) {
                $.each(params, function (idx, obj) {
                    $form.append($('<input/>').attr({name: idx, value: obj, type: 'hidden'}));
                });
            }

            var oldMethod = $form.attr('method');
            $form.attr('method', method);
            var oldAction = null;
            if (action && action != '#') {
                oldAction = $form.attr('action');
                $form.attr('action', action);
            }
            if (pjax !== 0 && $.support.pjax) {
                $form.on('submit',function(e){
                    $.pjax.submit(e, pjaxOptions);
                })
            }
            $form.trigger('submit');
            $.when($form.data('yiiSubmitFinalizePromise')).then(
                function () {
                    if (oldAction != null) {
                        $form.attr('action', oldAction);
                    }
                    $form.attr('method', oldMethod);

                    // remove the temporarily added hidden inputs
                    if (params && $.isPlainObject(params)) {
                        $.each(params, function (idx, obj) {
                            $('input[name="' + idx + '"]', $form).remove();
                        });
                    }

                    if (newForm) {
                        $form.remove();
                    }
                }
            );
        },

        getQueryParams: function (url) {
            var pos = url.indexOf('?');
            if (pos < 0) {
                return {};
            }

            var pairs = url.substring(pos + 1).split('#')[0].split('&'),
                params = {},
                pair,
                i;

            for (i = 0; i < pairs.length; i++) {
                pair = pairs[i].split('=');
                var name = decodeURIComponent(pair[0].replace(/\+/g, '%20'));
                var value = decodeURIComponent(pair[1].replace(/\+/g, '%20'));
                if (name.length) {
                    if (params[name] !== undefined) {
                        if (!$.isArray(params[name])) {
                            params[name] = [params[name]];
                        }
                        params[name].push(value || '');
                    } else {
                        params[name] = value || '';
                    }
                }
            }
            return params;
        },

        initModule: function (module) {
            if (module.isActive === undefined || module.isActive) {
                if ($.isFunction(module.init)) {
                    module.init();
                }
                $.each(module, function () {
                    if ($.isPlainObject(this)) {
                        pub.initModule(this);
                    }
                });
            }
        },

        init: function () {
            initCsrfHandler();
            initRedirectHandler();
            initScriptFilter();
            initDataMethods();
        }
    };

    function initRedirectHandler() {
        // handle AJAX redirection
        $(document).ajaxComplete(function (event, xhr, settings) {
            var url = xhr && xhr.getResponseHeader('X-Redirect');
            if (url) {
                window.location = url;
            }
        });
    }

    function initCsrfHandler() {
        // automatically send CSRF token for all AJAX requests
        $.ajaxPrefilter(function (options, originalOptions, xhr) {
            if (!options.crossDomain && pub.getCsrfParam()) {
                xhr.setRequestHeader('X-CSRF-Token', pub.getCsrfToken());
            }
        });
        pub.refreshCsrfToken();
    }

    function initDataMethods() {
        var handler = function (event) {
            var $this = $(this),
                method = $this.data('method'),
                message = $this.data('confirm'),
                form = $this.data('form');

            if (method === undefined && message === undefined && form === undefined) {
                return true;
            }

            if (message !== undefined) {
                $.proxy(pub.confirm, this)(message, function () {
                    pub.handleAction($this, event);
                });
            } else {
                pub.handleAction($this, event);
            }
            event.stopImmediatePropagation();
            return false;
        };

        // handle data-confirm and data-method for clickable and changeable elements
        $(document).on('click.yii', pub.clickableSelector, handler)
            .on('change.yii', pub.changeableSelector, handler);
    }

    function isReloadable(url) {
        var hostInfo = getHostInfo();

        for (var i = 0; i < pub.reloadableScripts.length; i++) {
            var rule = pub.reloadableScripts[i];
            rule = rule.charAt(0) === '/' ? hostInfo + rule : rule;

            var match = new RegExp("^" + escapeRegExp(rule).split('\\*').join('.*') + "$").test(url);
            if (match === true) {
                return true;
            }
        }

        return false;
    }

    // http://stackoverflow.com/questions/3446170/escape-string-for-use-in-javascript-regex
    function escapeRegExp(str) {
        return str.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
    }

    function getHostInfo() {
        return location.protocol + '//' + location.host;
    }

    function initScriptFilter() {
        var hostInfo = getHostInfo();
        var loadedScripts = {};

        var scripts = $('script[src]').map(function () {
            return this.src.charAt(0) === '/' ? hostInfo + this.src : this.src;
        }).toArray();
        for (var i = 0, len = scripts.length; i < len; i++) {
            loadedScripts[scripts[i]] = true;
        }

        $.ajaxPrefilter('script', function (options, originalOptions, xhr) {
            if (options.dataType == 'jsonp') {
                return;
            }

            var url = options.url.charAt(0) === '/' ? hostInfo + options.url : options.url;

            if (url in loadedScripts) {
                var item = loadedScripts[url];

                // If the concurrent XHR request is running and URL is not reloadable
                if (item !== true && !isReloadable(url)) {
                    // Abort the current XHR request when previous finished successfully
                    item.done(function () {
                        if (xhr && xhr.readyState !== 4) {
                            xhr.abort();
                        }
                    });
                    // Or abort previous XHR if the current one is loaded faster
                    xhr.done(function () {
                        if (item && item.readyState !== 4) {
                            item.abort();
                        }
                    });
                } else if (!isReloadable(url)) {
                    xhr.abort();
                }
            } else {
                loadedScripts[url] = xhr.done(function () {
                    loadedScripts[url] = true;
                }).fail(function () {
                    delete loadedScripts[url];
                });
            }
        });

        $(document).ajaxComplete(function (event, xhr, settings) {
            var styleSheets = [];
            $('link[rel=stylesheet]').each(function () {
                if (isReloadable(this.href)) {
                    return;
                }
                if ($.inArray(this.href, styleSheets) == -1) {
                    styleSheets.push(this.href)
                } else {
                    $(this).remove();
                }
            })
        });
    }

    return pub;
})(jQuery);

jQuery(function () {
    yii.initModule(yii);
});