/* global JSINFO */

/**
 * DokuWiki DataTables Plugins
 *
 * Home      http://dokuwiki.org/template:bootstrap3
 * Author    Giuseppe Di Terlizzi <giuseppe.diterlizzi@gmail.com>
 * License   GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * Copyright (C) 2015-2020, Giuseppe Di Terlizzi
 */
jQuery(document).ready(function () {

    const WRAP_TABLES_SELECTOR = '.page div.dt-wrapper table';
    const ALL_TABLES_SELECTOR = '.page table thead';

    /**
     * Initialize DataTables on the given table
     *
     * @param {jQuery} $target_table
     * @param {object} dt_config DataTable configuration
     */
    function init_datatables($target_table, dt_config) {
        console.debug(dt_config);

        // adjust header rows if requested
        let headerRows = dt_config.headerRows;
        if (headerRows) {
            const $tbody = jQuery('tbody', $target_table);

            // if table heade ismissing, create it
            let $thead = jQuery('thead', $target_table);
            if ($thead.length === 0) {
                $thead = jQuery('<thead>');
                $target_table.prepend($thead);
            }

            // move the first rows from tbody to thead
            headerRows -= $thead.children().length;
            while (headerRows > 0) {
                headerRows--;
                $thead.append($tbody.children().first());
            }
        }

        // initialize, unless there are colspans or rowspans
        if (
            jQuery('thead > tr', $target_table).length &&
            !jQuery('tbody', $target_table).find('[rowspan], [colspan]').length
        ) {
            $target_table.attr('width', '100%');
            const table = $target_table.DataTable(dt_config);
            
            // Add column filters if enabled
            if (JSINFO.plugin.datatables.enableColumnFilters) {
                addColumnFilters(table, $target_table);
            }
        }
    }

    /**
     * Add column filters to DataTable
     *
     * @param {DataTable} table DataTable instance
     * @param {jQuery} $target_table Table jQuery object
     */
    function addColumnFilters(table, $target_table) {
        const position = JSINFO.plugin.datatables.columnFiltersPosition || 'header';
        const $thead = $target_table.find('thead');
        
        // Create filter row
        const $filterRow = jQuery('<tr class="dt-column-filters"></tr>');
        
        // Add filter for each column
        table.columns().every(function(index) {
            const column = this;
            const $th = jQuery('<th></th>');
            
            // Create container for input and select
            const $filterContainer = jQuery('<div class="dt-filter-container"></div>');
            
            // Create search input for filtering dropdown options
            const $searchInput = jQuery('<input type="text" class="dt-filter-search" placeholder="Suchen..." />');
            
            // Create select dropdown
            const $select = jQuery('<select class="dt-filter-select"><option value="">Alle anzeigen</option></select>');
            
            // Get unique values from column
            const uniqueValues = [];
            const uniqueTexts = new Set();
            
            column.data().each(function(d) {
                if (d) {
                    // Extract text content if it contains HTML
                    const text = jQuery('<div>').html(d).text().trim();
                    if (text && !uniqueTexts.has(text)) {
                        uniqueTexts.add(text);
                        uniqueValues.push(text);
                    }
                }
            });
            
            // Sort unique values
            uniqueValues.sort();
            
            // Populate select with unique values
            uniqueValues.forEach(function(value) {
                $select.append('<option value="' + jQuery('<div>').text(value).html() + '">' + value + '</option>');
            });
            
            // Filter dropdown options AND table based on search input
            $searchInput.on('keyup', function() {
                const searchTerm = jQuery(this).val();
                
                // Filter dropdown options
                const searchTermLower = searchTerm.toLowerCase();
                $select.find('option').each(function() {
                    const optionText = jQuery(this).text().toLowerCase();
                    if (optionText.indexOf(searchTermLower) > -1 || jQuery(this).val() === '') {
                        jQuery(this).show();
                    } else {
                        jQuery(this).hide();
                    }
                });
                
                // Filter table column
                if (searchTerm) {
                    const escapedVal = searchTerm.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
                    column.search(escapedVal, true, false).draw();
                } else {
                    column.search('').draw();
                }
                
                // Reset dropdown selection when typing
                $select.val('');
            });
            
            // Filter table when dropdown changes
            $select.on('change', function() {
                const val = jQuery(this).val();
                if (val) {
                    // Escape special regex characters and search for exact match
                    const escapedVal = val.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
                    // Search using regex that matches the text anywhere in the cell
                    column.search(escapedVal, true, false).draw();
                } else {
                    // Clear search
                    column.search('').draw();
                }
            });
            
            // Add elements to container
            $filterContainer.append($searchInput);
            $filterContainer.append($select);
            $th.append($filterContainer);
            $filterRow.append($th);
        });
        
        // Add filter row to table
        if (position === 'header') {
            $thead.append($filterRow);
        } else {
            // Create tfoot if it doesn't exist
            let $tfoot = $target_table.find('tfoot');
            if ($tfoot.length === 0) {
                $tfoot = jQuery('<tfoot></tfoot>');
                $target_table.append($tfoot);
            }
            $tfoot.append($filterRow);
        }
    }

    // MAIN

    // check if plugin is configured
    if (!('plugin' in JSINFO) || !('datatables' in JSINFO.plugin)) return;

    // initialize on all tables, unless they have our wrapper (using default config)
    if (JSINFO.plugin.datatables.enableForAllTables) {
        jQuery(ALL_TABLES_SELECTOR).each(function () {
            const $target_table = jQuery(this).parent();

            if (!$target_table.parents('.dt-wrapper').length) {
                init_datatables($target_table, JSINFO.plugin.datatables.config);
            }
        });
    }

    // initialize on all tables with our wrapper (using default config + wrapper config)
    const $wrap_tables = jQuery(WRAP_TABLES_SELECTOR);
    if ($wrap_tables.length) {
        $wrap_tables.each(function () {
            const $target_table = jQuery(this);
            const wrap_config = jQuery(this).parents('.dt-wrapper').data();
            const dt_config = jQuery.extend(JSINFO.plugin.datatables.config, wrap_config);
            init_datatables($target_table, dt_config);
        });
    }
});