/**
 * Admin JavaScript for QDR Temporary Shared Storage plugin
 *
 * Handles all admin-side functionality including:
 * - Media page (loading, pagination, sorting, filtering, editing, deleting)
 * - Settings page (API key generation, settings saving, purging expired files)
 *
 * @package    QDR_Temporary_Shared_Storage
 * @since      1.0.0
 */

(function($) {
    'use strict';

    // Media page functionality
    var QDR_TSS_Media = {
        currentPage: 1,
        perPage: 10,
        totalPages: 1,
        currentOrderBy: 'upload_date',
        currentOrder: 'DESC',
        currentSearchFilename: '',
        currentSearchReference: '',

        /**
         * Initialize the media page
         */
        init: function() {
            // Load items on page load
            this.loadItems();

            // Initialize event handlers
            this.initEventHandlers();

            // Initialize datepicker
            this.initDatepicker();
        },

        /**
         * Initialize event handlers
         */
        initEventHandlers: function() {
            var self = this;

            // Handle sorting
            $('.qdr-tss-table th.sortable').on('click', function() {
                var column = $(this).data('sort');
                
                if (self.currentOrderBy === column) {
                    self.currentOrder = self.currentOrder === 'ASC' ? 'DESC' : 'ASC';
                } else {
                    self.currentOrderBy = column;
                    self.currentOrder = 'ASC';
                }
                
                self.loadItems();
            });
            
            // Handle search
            $('#qdr-tss-search-button').on('click', function() {
                self.currentSearchFilename = $('#qdr-tss-search-filename').val();
                self.currentSearchReference = $('#qdr-tss-search-reference').val();
                self.currentPage = 1;
                self.loadItems();
            });
            
            // Handle search reset
            $('#qdr-tss-reset-search').on('click', function() {
                $('#qdr-tss-search-filename').val('');
                $('#qdr-tss-search-reference').val('');
                self.currentSearchFilename = '';
                self.currentSearchReference = '';
                self.currentPage = 1;
                self.loadItems();
            });
            
            // Handle refresh button
            $('#qdr-tss-refresh').on('click', function() {
                self.loadItems();
            });
            
            // Handle modal close
            $('.qdr-tss-modal-close, .qdr-tss-modal-cancel').on('click', function() {
                $('.qdr-tss-modal').hide();
            });
            
            // Close modal when clicking outside
            $(window).on('click', function(e) {
                if ($(e.target).hasClass('qdr-tss-modal')) {
                    $('.qdr-tss-modal').hide();
                }
            });
            
            // Handle copy shortcode
            $(document).on('click', '.qdr-tss-copy-shortcode', function() {
                var shortcode = $('#qdr-tss-details-shortcode code').text();
                self.copyToClipboard(shortcode);
                alert(qdr_tss.strings.shortcode_copied);
            });
            
            // Handle copy permalink
            $(document).on('click', '.qdr-tss-copy-permalink', function() {
                var permalink = $('#qdr-tss-details-permalink a').attr('href');
                self.copyToClipboard(permalink);
                alert(qdr_tss.strings.permalink_copied);
            });
            
            // Handle edit item form submission
            $('#qdr-tss-edit-form').on('submit', function(e) {
                e.preventDefault();
                self.updateItem();
            });
            
            // Handle confirm delete
            $(document).on('click', '.qdr-tss-confirm-delete-button', function() {
                var id = $('#qdr-tss-delete-id').val();
                self.deleteItem(id);
            });
        },

        /**
         * Initialize datepicker
         */
        initDatepicker: function() {
            $(document).on('focus', '.qdr-tss-datepicker', function() {
                $(this).datepicker({
                    dateFormat: 'yy-mm-dd',
                    changeMonth: true,
                    changeYear: true
                });
            });
        },

        /**
         * Initialize action buttons
         */
        initActionButtons: function() {
            var self = this;
            
            // View button
            $('.qdr-tss-view-button').off('click').on('click', function() {
                var id = $(this).data('id');
                self.viewItem(id);
            });
            
            // Edit button
            $('.qdr-tss-edit-button').off('click').on('click', function() {
                var id = $(this).data('id');
                self.editItem(id);
            });
            
            // Delete button
            $('.qdr-tss-delete-button').off('click').on('click', function() {
                var id = $(this).data('id');
                self.showDeleteConfirmation(id);
            });
            
            // Pagination
            $('.qdr-tss-page-button').off('click').on('click', function() {
                self.currentPage = parseInt($(this).data('page'));
                self.loadItems();
            });
        },

        /**
         * Load items
         */
        loadItems: function() {
            var self = this;
            var data = {
                action: 'qdr_tss_get_items',
                nonce: qdr_tss.nonce,
                page: this.currentPage,
                per_page: this.perPage,
                orderby: this.currentOrderBy,
                order: this.currentOrder,
                original_file_name: this.currentSearchFilename,
                reference: this.currentSearchReference
            };
            
            // Show loading indicator
            $('#qdr-tss-items-list').html('<tr><td colspan="11" class="qdr-tss-loading"><span class="spinner is-active"></span> ' + qdr_tss.strings.loading + '</td></tr>');
            
            $.post(ajaxurl, data, function(response) {
                if (response.success) {
                    self.renderItems(response.data.items);
                    self.renderPagination(response.data.total, response.data.total_pages);
                } else {
                    alert(response.data.message || qdr_tss.strings.error_loading_items);
                }
            }).fail(function() {
                $('#qdr-tss-items-list').html('<tr><td colspan="11">' + qdr_tss.strings.error_loading_items_try_again + '</td></tr>');
            });
        },

        /**
         * Render items
         */
        renderItems: function(items) {
            var self = this;
            var $tbody = $('#qdr-tss-items-list');
            $tbody.empty();
            
            if (!items || items.length === 0) {
                $tbody.append('<tr><td colspan="11">' + qdr_tss.strings.no_items_found + '</td></tr>');
                return;
            }
            
            $.each(items, function(index, item) {
                var statusClass = self.getItemStatusClass(item);
                
                var row = '<tr data-id="' + item.id + '" class="' + statusClass + '">';
                
                row += '<td>' + item.fileid + '</td>';
                row += '<td>' + self.escapeHtml(item.original_file_name) + '</td>';
                row += '<td>' + self.escapeHtml(item.description || '') + '</td>';
                row += '<td>' + self.escapeHtml(item.message || '') + '</td>';
                row += '<td>' + self.formatDate(item.active_from) + '</td>';
                row += '<td>' + self.formatDate(item.active_to) + '</td>';
                row += '<td>' + self.escapeHtml(item.reference || '') + '</td>';
                row += '<td>' + self.formatDate(item.upload_date) + '</td>';
                row += '<td>' + item.download_count + '</td>';
                row += '<td>' + (item.last_download ? self.formatDate(item.last_download) : '-') + '</td>';
                
                row += '<td class="column-actions">';
                row += '<div class="qdr-tss-action-buttons">';
                row += '<button class="button qdr-tss-view-button" data-id="' + item.id + '" title="' + qdr_tss.strings.view_details + '"><span class="dashicons dashicons-visibility"></span></button>';
                row += '<button class="button qdr-tss-edit-button" data-id="' + item.id + '" title="' + qdr_tss.strings.edit + '"><span class="dashicons dashicons-edit"></span></button>';
                row += '<button class="button qdr-tss-delete-button" data-id="' + item.id + '" title="' + qdr_tss.strings.delete + '"><span class="dashicons dashicons-trash"></span></button>';
                row += '</div>';
                row += '</td>';
                
                row += '</tr>';
                
                $tbody.append(row);
            });
            
            // Initialize action buttons
            this.initActionButtons();
            
            // Update sorting indicators
            this.updateSortIndicators();
        },

        /**
         * Get item status class
         */
        getItemStatusClass: function(item) {
            var now = new Date();
            var activeFrom = new Date(item.active_from);
            var activeTo = new Date(item.active_to);
            
            if (now < activeFrom) {
                return 'qdr-tss-status-pending';
            } else if (now > activeTo) {
                return 'qdr-tss-status-expired';
            } else {
                return 'qdr-tss-status-active';
            }
        },

        /**
         * Render pagination
         */
        renderPagination: function(total, totalPages) {
            var $info = $('.qdr-tss-pagination-info');
            var $controls = $('.qdr-tss-pagination-controls');
            
            // Update info
            var startItem = (this.currentPage - 1) * this.perPage + 1;
            var endItem = Math.min(this.currentPage * this.perPage, total);
            
            if (total === 0) {
                $info.html(qdr_tss.strings.no_items);
                $controls.empty();
                return;
            }
            
            $info.html(qdr_tss.strings.showing + ' ' + startItem + ' - ' + endItem + ' ' + qdr_tss.strings.of + ' ' + total);
            
            // Update controls
            $controls.empty();
            
            if (totalPages <= 1) {
                return;
            }
            
            // First page
            if (this.currentPage > 1) {
                $controls.append('<button class="button qdr-tss-page-button" data-page="1" title="' + qdr_tss.strings.first_page + '">&laquo;</button>');
            }
            
            // Previous page
            if (this.currentPage > 1) {
                $controls.append('<button class="button qdr-tss-page-button" data-page="' + (this.currentPage - 1) + '" title="' + qdr_tss.strings.previous_page + '">&lsaquo;</button>');
            }
            
            // Page numbers
            var startPage = Math.max(1, this.currentPage - 2);
            var endPage = Math.min(totalPages, startPage + 4);
            
            if (endPage - startPage < 4) {
                startPage = Math.max(1, endPage - 4);
            }
            
            for (var i = startPage; i <= endPage; i++) {
                var activeClass = i === this.currentPage ? 'button-primary' : '';
                $controls.append('<button class="button qdr-tss-page-button ' + activeClass + '" data-page="' + i + '">' + i + '</button>');
            }
            
            // Next page
            if (this.currentPage < totalPages) {
                $controls.append('<button class="button qdr-tss-page-button" data-page="' + (this.currentPage + 1) + '" title="' + qdr_tss.strings.next_page + '">&rsaquo;</button>');
            }
            
            // Last page
            if (this.currentPage < totalPages) {
                $controls.append('<button class="button qdr-tss-page-button" data-page="' + totalPages + '" title="' + qdr_tss.strings.last_page + '">&raquo;</button>');
            }
            
            // Rebind click events
            this.initActionButtons();
        },

        /**
         * Update sort indicators
         */
        updateSortIndicators: function() {
            // Remove all indicators
            $('.qdr-tss-table th').removeClass('sorted asc desc');
            
            // Add indicator to current sort column
            var $th = $('.qdr-tss-table th[data-sort="' + this.currentOrderBy + '"]');
            $th.addClass('sorted ' + this.currentOrder.toLowerCase());
        },

        /**
         * View item details
         */
        viewItem: function(id) {
            var self = this;
            
            // Show loading modal
            $('#qdr-tss-details-modal').show();
            $('.qdr-tss-details-content').html('<div class="qdr-tss-loading"><span class="spinner is-active"></span> ' + qdr_tss.strings.loading + '</div>');
            
            // Get additional data via AJAX
            var data = {
                action: 'qdr_tss_get_item_details',
                nonce: qdr_tss.nonce,
                id: id
            };
            
            $.post(ajaxurl, data, function(response) {
                if (response.success) {
                    var item = response.data.item;
                    
                    // Populate details
                    $('#qdr-tss-details-fileid').text(item.fileid);
                    $('#qdr-tss-details-filename').text(item.original_file_name);
                    $('#qdr-tss-details-description').text(item.description || '-');
                    $('#qdr-tss-details-message').text(item.message || '-');
                    $('#qdr-tss-details-reference').text(item.reference || '-');
                    $('#qdr-tss-details-active-period').text(self.formatDate(item.active_from) + ' - ' + self.formatDate(item.active_to));
                    $('#qdr-tss-details-filesize').text(self.formatFileSize(item.file_size));
                    $('#qdr-tss-details-download-count').text(item.download_count);
                    $('#qdr-tss-details-last-download').text(item.last_download ? self.formatDate(item.last_download) : '-');
                    
                    // Permalink and shortcode
                    $('#qdr-tss-details-permalink').html('<a href="' + item.permalink + '" target="_blank">' + item.permalink + '</a>');
                    $('#qdr-tss-details-shortcode').html('<code>' + item.shortcode + '</code>');
                    
                    // Initialize copy buttons
                    $('.qdr-tss-copy-shortcode').data('text', item.shortcode);
                    $('.qdr-tss-copy-permalink').data('text', item.permalink);
                } else {
                    alert(response.data.message || qdr_tss.strings.error_loading_item_details);
                    $('#qdr-tss-details-modal').hide();
                }
            }).fail(function() {
                alert(qdr_tss.strings.error_loading_item_details_try_again);
                $('#qdr-tss-details-modal').hide();
            });
        },

        /**
         * Edit item
         */
        editItem: function(id) {
            // Find item in the table
            var $row = $('tr[data-id="' + id + '"]');
            if ($row.length === 0) return;
            
            var $cells = $row.find('td');
            
            // Populate form fields
            $('#qdr-tss-edit-id').val(id);
            $('#qdr-tss-edit-description').val($cells.eq(2).text());
            $('#qdr-tss-edit-message').val($cells.eq(3).text());
            
            // Parse dates for datepicker
            var activeFrom = $cells.eq(4).text();
            var activeTo = $cells.eq(5).text();
            
            $('#qdr-tss-edit-active-from').val(activeFrom !== '-' ? activeFrom : '');
            $('#qdr-tss-edit-active-to').val(activeTo !== '-' ? activeTo : '');
            $('#qdr-tss-edit-reference').val($cells.eq(6).text());
            
            // Clear status
            $('#qdr-tss-edit-status').html('');
            
            // Show modal
            $('#qdr-tss-edit-modal').show();
        },

        /**
         * Update item
         */
        updateItem: function() {
            var self = this;
            
            // Show loading status
            $('#qdr-tss-edit-status').html('<div class="qdr-tss-loading"><span class="spinner is-active"></span> ' + qdr_tss.strings.saving + '</div>');
            
            var data = {
                action: 'qdr_tss_edit_item',
                nonce: qdr_tss.nonce,
                id: $('#qdr-tss-edit-id').val(),
                description: $('#qdr-tss-edit-description').val(),
                message: $('#qdr-tss-edit-message').val(),
                active_from: $('#qdr-tss-edit-active-from').val(),
                active_to: $('#qdr-tss-edit-active-to').val(),
                reference: $('#qdr-tss-edit-reference').val()
            };
            
            $.post(ajaxurl, data, function(response) {
                if (response.success) {
                    // Show success status
                    $('#qdr-tss-edit-status').html('<div class="notice notice-success inline"><p>' + (response.data.message || qdr_tss.strings.changes_saved) + '</p></div>');
                    
                    // Hide modal after a delay
                    setTimeout(function() {
                        $('#qdr-tss-edit-modal').hide();
                        
                        // Reload items
                        self.loadItems();
                    }, 1000);
                } else {
                    // Show error status
                    $('#qdr-tss-edit-status').html('<div class="notice notice-error inline"><p>' + (response.data.message || qdr_tss.strings.error_saving_changes) + '</p></div>');
                }
            }).fail(function() {
                // Show error status
                $('#qdr-tss-edit-status').html('<div class="notice notice-error inline"><p>' + qdr_tss.strings.error_saving_changes_try_again + '</p></div>');
            });
        },

        /**
         * Show delete confirmation
         */
        showDeleteConfirmation: function(id) {
            $('#qdr-tss-delete-id').val(id);
            $('#qdr-tss-confirm-delete-modal').show();
        },

        /**
         * Delete item
         */
        deleteItem: function(id) {
            var self = this;
            var data = {
                action: 'qdr_tss_delete_item',
                nonce: qdr_tss.nonce,
                id: id
            };
            
            $.post(ajaxurl, data, function(response) {
                if (response.success) {
                    // Hide modal
                    $('#qdr-tss-confirm-delete-modal').hide();
                    
                    // Show success message
                    alert(response.data.message || qdr_tss.strings.file_deleted);
                    
                    // Reload items
                    self.loadItems();
                } else {
                    alert(response.data.message || qdr_tss.strings.error_deleting_file);
                }
            }).fail(function() {
                alert(qdr_tss.strings.error_deleting_file_try_again);
            });
        },

        /**
         * Format date
         */
        formatDate: function(dateString) {
            if (!dateString || dateString === '0000-00-00 00:00:00') {
                return '-';
            }
            
            var date = new Date(dateString);
            
            // Check if date is valid
            if (isNaN(date.getTime())) {
                return dateString;
            }
            
            return date.toLocaleDateString() + ' ' + date.toLocaleTimeString();
        },

        /**
         * Format file size
         */
        formatFileSize: function(bytes) {
            if (bytes === 0) return '0 Bytes';
            
            var k = 1024;
            var sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
            var i = Math.floor(Math.log(bytes) / Math.log(k));
            
            return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
        },

        /**
         * Escape HTML
         */
        escapeHtml: function(text) {
            if (!text) return '';
            
            var map = {
                '&': '&amp;',
                '<': '&lt;',
                '>': '&gt;',
                '"': '&quot;',
                "'": '&#039;'
            };
            
            return text.toString().replace(/[&<>"']/g, function(m) { return map[m]; });
        },

        /**
         * Copy to clipboard
         */
        copyToClipboard: function(text) {
            var $temp = $('<input>');
            $('body').append($temp);
            $temp.val(text).select();
            document.execCommand('copy');
            $temp.remove();
        }
    };

    // Settings page functionality
    var QDR_TSS_Settings = {
        /**
         * Initialize the settings page
         */
        init: function() {
            // Initialize event handlers
            this.initEventHandlers();
        },

        /**
         * Initialize event handlers
         */
        initEventHandlers: function() {
            var self = this;

            // Generate new API key
            $('#qdr-tss-generate-key').on('click', function(e) {
                e.preventDefault();
                self.generateApiKey();
            });
            
            // Save settings
            $('#qdr-tss-settings-form').on('submit', function(e) {
                e.preventDefault();
                self.saveSettings();
            });
            
            // Purge expired files
            $('#qdr-tss-purge-expired').on('click', function(e) {
                e.preventDefault();
                self.purgeExpiredFiles();
            });
        },

        /**
         * Generate API key
         */
        generateApiKey: function() {
            // Generate a random string for API key
            var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
            var apiKey = '';
            for (var i = 0; i < 32; i++) {
                apiKey += chars.charAt(Math.floor(Math.random() * chars.length));
            }
            
            $('#qdr-tss-api-key').val(apiKey);
        },

        /**
         * Save settings
         */
        saveSettings: function() {
            var data = {
                action: 'qdr_tss_save_settings',
                nonce: qdr_tss.nonce,
                api_key: $('#qdr-tss-api-key').val(),
                media_category: $('#qdr-tss-media-category').val(),
                max_upload_size: $('#qdr-tss-max-upload-size').val()
            };
            
            $.post(ajaxurl, data, function(response) {
                if (response.success) {
                    alert(response.data.message);
                } else {
                    alert(response.data.message);
                }
            });
        },

        /**
         * Purge expired files
         */
        purgeExpiredFiles: function() {
            if (!confirm(qdr_tss.strings.confirm_purge)) {
                return;
            }
            
            var data = {
                action: 'qdr_tss_purge_expired',
                nonce: qdr_tss.nonce
            };
            
            $.post(ajaxurl, data, function(response) {
                if (response.success) {
                    alert(response.data.message);
                    // Reload page to update storage usage
                    location.reload();
                } else {
                    alert(response.data.message);
                }
            });
        }
    };

    // Document ready
    $(function() {
        // Initialize appropriate page functionality
        if ($('.qdr-tss-table').length) {
            QDR_TSS_Media.init();
        }
        
        if ($('#qdr-tss-settings-form').length) {
            QDR_TSS_Settings.init();
        }
    });

})(jQuery);