/**
 * jQuery Yii GridView plugin file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright Copyright &copy; 2008-2010 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 * @version $Id$
 */

(function ($) {
    var selectCheckedRows, methods,
        gridSettings = [];
    /**
     * 1. Selects rows that have checkbox checked (only checkbox that is connected with selecting a row)
     * 2. Check if "check all" need to be checked/unchecked
     * @return object the jQuery object
     */
    selectCheckedRows = function (gridId) {
        var settings = gridSettings[gridId],
            table = $('#' + gridId).children('.' + settings.tableClass);

        table.children('tbody').find('input.select-on-check').filter(':checked').each(function () {
            $(this).closest('tr').addClass('selected');
        });

        table.children('thead').find('th input').filter('[type="checkbox"]').each(function () {
            var name = this.name.substring(0, this.name.length - 4) + '[]', //.. remove '_all' and add '[]''
                $checks = $("input[name='" + name + "']", table);
            this.checked = $checks.length > 0 && $checks.length === $checks.filter(':checked').length;
        });
        return this;
    };

    methods = {
        /**
         * yiiGridView set function.
         * @param options map settings for the grid view. Available options are as follows:
         * - ajaxUpdate: array, IDs of the containers whose content may be updated by ajax response
         * - ajaxVar: string, the name of the GET variable indicating the ID of the element triggering the AJAX request
         * - pagerClass: string, the CSS class for the pager container
         * - tableClass: string, the CSS class for the table
         * - selectableRows: integer, the number of rows that can be selected
         * - updateSelector: string, the selector for choosing which elements can trigger ajax requests
         * - beforeAjaxUpdate: function, the function to be called before ajax request is sent
         * - afterAjaxUpdate: function, the function to be called after ajax response is received
         * - ajaxUpdateError: function, the function to be called if an ajax error occurs
         * - selectionChanged: function, the function to be called after the row selection is changed
         * @return object the jQuery object
         */
        init: function (options) {
            var settings = $.extend({
                    ajaxUpdate: [],
                    ajaxVar: 'ajax',
                    pagerClass: 'pager',
                    loadingClass: 'loading',
                    filterClass: 'filters',
                    tableClass: 'items',
                    selectableRows: 1
                    // updateSelector: '#id .pager a, '#id .grid thead th a',
                    // beforeAjaxUpdate: function (id) {},
                    // afterAjaxUpdate: function (id, data) {},
                    // selectionChanged: function (id) {},
                    // url: 'ajax request URL'
                }, options || {});

            settings.tableClass = settings.tableClass.replace(/\s+/g, '.');

            return this.each(function () {
                var eventType,
                    $grid = $(this),
                    id = $grid.attr('id'),
                    pagerSelector = '#' + id + ' .' + settings.pagerClass.replace(/\s+/g, '.') + ' a',
                    sortSelector = '#' + id + ' .' + settings.tableClass + ' thead th a.sort-link',
                    inputSelector = '#' + id + ' .' + settings.filterClass + ' input, ' + '#' + id + ' .' + settings.filterClass + ' select';

                settings.updateSelector = settings.updateSelector
                                .replace('{page}', pagerSelector)
                                .replace('{sort}', sortSelector);

                gridSettings[id] = settings;

                if (settings.ajaxUpdate.length > 0) {
                    $(document).on('click.yiiGridView', settings.updateSelector, function () {
                        // Check to see if History.js is enabled for our Browser
                        if (settings.enableHistory && window.History.enabled) {
                            // Ajaxify this link
                            var url = $(this).attr('href'),
                                params = $.deparam.querystring(url);

                            delete params[settings.ajaxVar];
                            window.History.pushState(null, document.title, $.param.querystring(url.substr(0, url.indexOf('?')), params));
                        } else {
                            $('#' + id).yiiGridView('update', {url: $(this).attr('href')});
                        }
                        return false;
                    });
                }

                $(document).on('change.yiiGridView keydown.yiiGridView', inputSelector, function (event) {
                    if (event.type === 'keydown') {
                        if( event.keyCode !== 13) {
                            return; // only react to enter key
                        } else {
                            eventType = 'keydown';
                        }
                    } else {
                        // prevent processing for both keydown and change events
                        if (eventType === 'keydown') {
                            eventType = '';
                            return;
                        }
                    }
                    var data = $(inputSelector).serialize();
                    if (settings.pageVar !== undefined) {
                        data += '&' + settings.pageVar + '=1';
                    }
                    if (settings.enableHistory && settings.ajaxUpdate !== false && window.History.enabled) {
                        // Ajaxify this link
                        var url = $('#' + id).yiiGridView('getUrl'),
                            params = $.deparam.querystring($.param.querystring(url, data));

                        delete params[settings.ajaxVar];
                        window.History.pushState(null, document.title, $.param.querystring(url.substr(0, url.indexOf('?')), params));
                    } else {
                        $('#' + id).yiiGridView('update', {data: data});
                    }
                });

                if (settings.enableHistory && settings.ajaxUpdate !== false && window.History.enabled) {
                    $(window).bind('statechange', function() { // Note: We are using statechange instead of popstate
                        var State = window.History.getState(); // Note: We are using History.getState() instead of event.state
                        $('#' + id).yiiGridView('update', {url: State.url});
                    });
                }

                /**
                 * Modified to support 'disabled' class, which will not select rows / checkmarks - Ryan Holmes
                 */
                if (settings.selectableRows > 0) {
                    selectCheckedRows(this.id);
                    $(document).on('click.yiiGridView', '#' + id + ' .' + settings.tableClass + ' > tbody > tr', function (e) {
                        var $currentGrid, $row, isRowSelected, $checks,
                            $target = $(e.target);

                        if ($target.closest('td').is('.empty,.button-column') || (e.target.type === 'checkbox' && !$target.hasClass('select-on-check')) || $(this).hasClass('disabled') ) {
                            return;
                        }

                        $row = $(this);
                        $currentGrid = $('#' + id);
                        $checks = $('input.select-on-check', $currentGrid);
                        isRowSelected = $row.toggleClass('selected').hasClass('selected');

                        if (settings.selectableRows === 1) {
                            $row.siblings().removeClass('selected');
                            $checks.prop('checked', false);
                        }
                        $('input.select-on-check', $row).prop('checked', isRowSelected);
                        $("input.select-on-check-all", $currentGrid).prop('checked', $checks.length === $checks.filter(':checked').length);

                        if (settings.selectionChanged !== undefined) {
                            settings.selectionChanged(id);
                        }
                    });
                    if (settings.selectableRows > 1) {
                        $(document).on('click.yiiGridView', '#' + id + ' .select-on-check-all', function () {
                            var $currentGrid = $('#' + id),
                                $checks = $('input.select-on-check', $currentGrid).not(':disabled'),
                                $checksAll = $('input.select-on-check-all', $currentGrid).not(':disabled'),
                                $rows = $currentGrid.children('.' + settings.tableClass).children('tbody').children().not('.disabled');
                            if (this.checked) {
                                $rows.addClass('selected');
                                $checks.prop('checked', true);
                                $checksAll.prop('checked', true);
                            } else {
                                $rows.removeClass('selected');
                                $checks.prop('checked', false);
                                $checksAll.prop('checked', false);
                            }
                            if (settings.selectionChanged !== undefined) {
                                settings.selectionChanged(id);
                            }
                        });
                    }
                } else {
                    $(document).on('click.yiiGridView', '#' + id + ' .select-on-check', false);
                }
            });
        },

        /**
         * Returns the key value for the specified row
         * @param row integer the row number (zero-based index)
         * @return string the key value
         */
        getKey: function (row) {
            return this.children('.keys').children('span').eq(row).text();
        },

        /**
         * Returns the URL that generates the grid view content.
         * @return string the URL that generates the grid view content.
         */
        getUrl: function () {
            var sUrl = gridSettings[this.attr('id')].url;
            return sUrl || this.children('.keys').attr('title');
        },

        /**
         * Returns the jQuery collection of the cells in the specified row.
         * @param row integer the row number (zero-based index)
         * @return jQuery the jQuery collection of the cells in the specified row.
         */
        getRow: function (row) {
            var sClass = gridSettings[this.attr('id')].tableClass;
            return this.children('.' + sClass).children('tbody').children('tr').eq(row).children();
        },

        /**
         * Returns the jQuery collection of the cells in the specified column.
         * @param column integer the column number (zero-based index)
         * @return jQuery the jQuery collection of the cells in the specified column.
         */
        getColumn: function (column) {
            var sClass = gridSettings[this.attr('id')].tableClass;
            return this.children('.' + sClass).children('tbody').children('tr').children('td:nth-child(' + (column + 1) + ')');
        },

        /**
         * Performs an AJAX-based update of the grid view contents.
         * @param options map the AJAX request options (see jQuery.ajax API manual). By default,
         * the URL to be requested is the one that generates the current content of the grid view.
         * @return object the jQuery object
         */
        update: function (options) {
            var customError;
            if (options && options.error !== undefined) {
                customError = options.error;
                delete options.error;
            }

            return this.each(function () {
                var $form,
                    $grid = $(this),
                    id = $grid.attr('id'),
                    settings = gridSettings[id];
                $grid.addClass(settings.loadingClass);

                options = $.extend({
                    type: 'GET',
                    url: $grid.yiiGridView('getUrl'),
                    success: function (data) {
                        var $data = $('<div>' + data + '</div>');
                        $grid.removeClass(settings.loadingClass);
                        $.each(settings.ajaxUpdate, function (i, el) {
                            var updateId = '#' + el;
                            $(updateId).replaceWith($(updateId, $data));
                        });
                        if (settings.afterAjaxUpdate !== undefined) {
                            settings.afterAjaxUpdate(id, data);
                        }
                        if (settings.selectableRows > 0) {
                            selectCheckedRows(id);
                        }
                    },
                    error: function (XHR, textStatus, errorThrown) {
                        var ret, err;
                        $grid.removeClass(settings.loadingClass);
                        if (XHR.readyState === 0 || XHR.status === 0) {
                            return;
                        }
                        if (customError !== undefined) {
                            ret = customError(XHR);
                            if (ret !== undefined && !ret) {
                                return;
                            }
                        }
                        switch (textStatus) {
                        case 'timeout':
                            err = 'The request timed out!';
                            break;
                        case 'parsererror':
                            err = 'Parser error!';
                            break;
                        case 'error':
                            if (XHR.status && !/^\s*$/.test(XHR.status)) {
                                err = 'Error ' + XHR.status;
                            } else {
                                err = 'Error';
                            }
                            if (XHR.responseText && !/^\s*$/.test(XHR.responseText)) {
                                err = err + ': ' + XHR.responseText;
                            }
                            break;
                        }

                        if (settings.ajaxUpdateError !== undefined) {
                            settings.ajaxUpdateError(XHR, textStatus, errorThrown, err);
                        } else if (err) {
                            alert(err);
                        }
                    }
                }, options || {});
                if (options.data !== undefined && options.type === 'GET') {
                    options.url = $.param.querystring(options.url, options.data);
                    options.data = {};
                }

                if (settings.ajaxUpdate !== false) {
                    options.url = $.param.querystring(options.url, settings.ajaxVar + '=' + id);
                    if (settings.beforeAjaxUpdate !== undefined) {
                        settings.beforeAjaxUpdate(id, options);
                    }
                    $.ajax(options);
                } else {  // non-ajax mode
                    if (options.type === 'GET') {
                        window.location.href = options.url;
                    } else {  // POST mode
                        $form = $('<form action="' + options.url + '" method="post"></form>').appendTo('body');
                        if (options.data === undefined) {
                            options.data = {};
                        }

                        if (options.data.returnUrl === undefined) {
                            options.data.returnUrl = window.location.href;
                        }

                        $.each(options.data, function (name, value) {
                            $form.append($('<input type="hidden" name="t" value="" />').attr('name', name).val(value));
                        });
                        $form.submit();
                    }
                }
            });
        },

        /**
         * Returns the key values of the currently selected rows.
         * @return array the key values of the currently selected rows.
         */
        getSelection: function () {
            var settings = gridSettings[this.attr('id')],
                keys = this.find('.keys span'),
                selection = [];
            this.find('.' + settings.tableClass).children('tbody').children().each(function (i) {
                if ($(this).hasClass('selected')) {
                    selection.push(keys.eq(i).text());
                }
            });
            return selection;
        },

        /**
         * Returns the key values of the currently checked rows.
         * @param column_id string the ID of the column
         * @return array the key values of the currently checked rows.
         */
        getChecked: function (column_id) {
            var settings = gridSettings[this.attr('id')],
                keys = this.find('.keys span'),
                checked = [];
            if (column_id.substring(column_id.length - 2) !== '[]') {
                column_id = column_id + '[]';
            }
            this.find('.' + settings.tableClass).children('tbody').children('tr').children('td').children('input[name="' + column_id + '"]').each(function (i) {
                if (this.checked) {
                    checked.push(keys.eq(i).text());
                }
            });
            return checked;
        }
    };

    $.fn.yiiGridView = function (method) {
        if (methods[method]) {
            return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
        } else if (typeof method === 'object' || !method) {
            return methods.init.apply(this, arguments);
        } else {
            $.error('Method ' + method + ' does not exist on jQuery.yiiGridView');
            return false;
        }
    };

/******************************************************************************
 *** DEPRECATED METHODS
 *** used before Yii 1.1.9
 ******************************************************************************/
    $.fn.yiiGridView.settings = gridSettings;
    /**
     * Returns the key value for the specified row
     * @param id string the ID of the grid view container
     * @param row integer the row number (zero-based index)
     * @return string the key value
     */
    $.fn.yiiGridView.getKey = function (id, row) {
        return $('#' + id).yiiGridView('getKey', row);
    };

    /**
     * Returns the URL that generates the grid view content.
     * @param id string the ID of the grid view container
     * @return string the URL that generates the grid view content.
     */
    $.fn.yiiGridView.getUrl = function (id) {
        return $('#' + id).yiiGridView('getUrl');
    };

    /**
     * Returns the jQuery collection of the cells in the specified row.
     * @param id string the ID of the grid view container
     * @param row integer the row number (zero-based index)
     * @return jQuery the jQuery collection of the cells in the specified row.
     */
    $.fn.yiiGridView.getRow = function (id, row) {
        return $('#' + id).yiiGridView('getRow', row);
    };

    /**
     * Returns the jQuery collection of the cells in the specified column.
     * @param id string the ID of the grid view container
     * @param column integer the column number (zero-based index)
     * @return jQuery the jQuery collection of the cells in the specified column.
     */
    $.fn.yiiGridView.getColumn = function (id, column) {
        return $('#' + id).yiiGridView('getColumn', column);
    };

    /**
     * Performs an AJAX-based update of the grid view contents.
     * @param id string the ID of the grid view container
     * @param options map the AJAX request options (see jQuery.ajax API manual). By default,
     * the URL to be requested is the one that generates the current content of the grid view.
     */
    $.fn.yiiGridView.update = function (id, options) {
        $('#' + id).yiiGridView('update', options);
    };

    /**
     * Returns the key values of the currently selected rows.
     * @param id string the ID of the grid view container
     * @return array the key values of the currently selected rows.
     */
    $.fn.yiiGridView.getSelection = function (id) {
        return $('#' + id).yiiGridView('getSelection');
    };

    /**
     * Returns the key values of the currently checked rows.
     * @param id string the ID of the grid view container
     * @param column_id string the ID of the column
     * @return array the key values of the currently checked rows.
     */
    $.fn.yiiGridView.getChecked = function (id, column_id) {
        return $('#' + id).yiiGridView('getChecked', column_id);
    };
})(jQuery);