<?php

if (!defined('ABSPATH')) {
	exit;
}

final class LeExport_Admin {
	private static ?LeExport_Admin $instance = null;

	public static function instance(): LeExport_Admin {
		if (self::$instance === null) {
			self::$instance = new LeExport_Admin();
		}
		return self::$instance;
	}

	private function __construct() {
		add_action('admin_menu', [$this, 'register_menu']);
		add_action('admin_init', [$this, 'register_settings']);
		add_action('admin_enqueue_scripts', [$this, 'enqueue_assets']);

		add_action('admin_post_leexport_export_csv', [$this, 'handle_export_csv']);
		add_action('admin_post_leexport_export_link_scan_csv', [$this, 'handle_export_link_scan_csv']);
		add_action('admin_post_leexport_export_url_txt', [$this, 'handle_export_url_txt']);
		add_action('admin_post_leexport_export_url_csv', [$this, 'handle_export_url_csv']);

		add_action('wp_ajax_leexport_scan_start', [$this, 'ajax_scan_start']);
		add_action('wp_ajax_leexport_scan_poll', [$this, 'ajax_scan_poll']);
		add_action('wp_ajax_leexport_scan_cancel', [$this, 'ajax_scan_cancel']);
	}

	public function register_menu(): void {
		add_options_page(
			__('LeExport', 'leexport'),
			__('LeExport', 'leexport'),
			'manage_options',
			'leexport',
			[$this, 'render_settings_page']
		);
	}

	public function register_settings(): void {
		register_setting('leexport', leexport_settings_key(), [
			'type' => 'array',
			'sanitize_callback' => [$this, 'sanitize_settings'],
			'default' => leexport_default_settings(),
		]);
	}

	public function sanitize_settings($raw): array {
		$out = leexport_get_settings();
		$defaults = leexport_default_settings();

		if (!is_array($raw)) {
			return $out;
		}

		// Post types.
		if (isset($raw['post_types']) && is_array($raw['post_types'])) {
			$post_types = [];
			foreach ($raw['post_types'] as $pt) {
				$pt = sanitize_key((string)$pt);
				if ($pt !== '') {
					$post_types[] = $pt;
				}
			}
			$out['post_types'] = $post_types ?: $defaults['post_types'];
		}

		// Fields.
		if (isset($raw['fields']) && is_array($raw['fields'])) {
			$merged = array_merge($defaults['fields'], is_array($out['fields'] ?? null) ? $out['fields'] : []);
			foreach ($merged as $k => $_) {
				$merged[$k] = leexport_bool_int($raw['fields'][$k] ?? 0);
			}
			$out['fields'] = $merged;
		}

		// Date format.
		// Removed: custom date format. We use the WordPress date format setting.

		// Export options.
		if (isset($raw['export']) && is_array($raw['export'])) {
			$export = array_merge($defaults['export'], is_array($out['export'] ?? null) ? $out['export'] : []);
			$export['split_rows'] = leexport_sanitize_int($raw['export']['split_rows'] ?? $export['split_rows'], 0, 100000);
			$out['export'] = $export;
		}

		if (isset($raw['filters']) && is_array($raw['filters'])) {
			$out['filters'] = leexport_sanitize_filters($raw['filters']);
		}

		// Link check options.
		if (isset($raw['link_check']) && is_array($raw['link_check'])) {
			$link = array_merge($defaults['link_check'], is_array($out['link_check'] ?? null) ? $out['link_check'] : []);
			$ua = isset($raw['link_check']['user_agent']) ? (string)$raw['link_check']['user_agent'] : $defaults['link_check']['user_agent'];
			$ua = trim($ua);
			$link['enabled'] = leexport_bool_int($raw['link_check']['enabled'] ?? $link['enabled']);
			$link['max_items'] = leexport_sanitize_int($raw['link_check']['max_items'] ?? $link['max_items'], 1, 500);
			$link['batch_posts'] = leexport_sanitize_int($raw['link_check']['batch_posts'] ?? $link['batch_posts'], 1, 50);
			$link['batch_urls'] = leexport_sanitize_int($raw['link_check']['batch_urls'] ?? $link['batch_urls'], 1, 100);
			$link['include_internal'] = leexport_bool_int($raw['link_check']['include_internal'] ?? $link['include_internal']);
			$link['include_external'] = leexport_bool_int($raw['link_check']['include_external'] ?? $link['include_external']);
			$link['max_links'] = leexport_sanitize_int($raw['link_check']['max_links'] ?? $link['max_links'], 50, 5000);
			$link['allow_private_targets'] = leexport_bool_int($raw['link_check']['allow_private_targets'] ?? $link['allow_private_targets']);
			$link['timeout'] = leexport_sanitize_int($raw['link_check']['timeout'] ?? $link['timeout'], 2, 30);
			$link['user_agent'] = $ua !== '' ? $ua : $link['user_agent'];
			$out['link_check'] = $link;
		}

		return $out;
	}

	public function enqueue_assets(string $hook): void {
		if ($hook !== 'settings_page_leexport') {
			return;
		}

		wp_enqueue_style('leexport-admin', LEEXPORT_URL . 'assets/admin.css', [], LEEXPORT_VERSION);
		wp_enqueue_script('leexport-admin', LEEXPORT_URL . 'assets/admin.js', ['jquery'], LEEXPORT_VERSION, true);
		wp_localize_script('leexport-admin', 'LeExportAdmin', [
			'ajaxUrl' => admin_url('admin-ajax.php'),
			'exportTabUrl' => admin_url('options-general.php?page=leexport&tab=export'),
			'linkCheckTabUrl' => admin_url('options-general.php?page=leexport&tab=linkcheck'),
			'nonce' => wp_create_nonce('leexport_ajax'),
			'i18n' => [
				'idle' => __('Idle.', 'leexport'),
				'mode_content_links' => __('Content links', 'leexport'),
				'mode_site_urls' => __('Site URLs', 'leexport'),
				'posts' => __('Posts', 'leexport'),
				'urls_checked' => __('URLs checked', 'leexport'),
				'status' => __('Status', 'leexport'),
			],
		]);
	}

	public function render_settings_page(): void {
		if (!current_user_can('manage_options')) {
			return;
		}

		$settings = leexport_get_settings();
		$post_types = get_post_types(['public' => true], 'objects');
		$categories = get_categories([
			'taxonomy' => 'category',
			'hide_empty' => false,
			'orderby' => 'name',
			'order' => 'ASC',
		]);
		$filter_match_count = LeExport_Exporter::count_published_posts($settings);
		$topic_taxonomy_options = leexport_get_topic_taxonomy_options();
		$active_topic_taxonomy = leexport_resolve_topic_taxonomy($settings);
		$topic_terms = [];
		if ($active_topic_taxonomy !== '') {
			$topic_terms = get_terms([
				'taxonomy' => $active_topic_taxonomy,
				'hide_empty' => false,
				'orderby' => 'name',
				'order' => 'ASC',
			]);
			if (is_wp_error($topic_terms)) {
				$topic_terms = [];
			}
		}

		$link_scan = get_transient('leexport_link_scan_latest');
		if (!is_array($link_scan)) {
			$link_scan = null;
		}

		// Read-only tab selector (GET); no state change, nonce not required.
		$leexport_tab = isset($_GET['tab']) ? sanitize_key(wp_unslash((string)$_GET['tab'])) : 'export'; // phpcs:ignore WordPress.Security.NonceVerification.Recommended
		$active_tab = $leexport_tab === 'linkcheck' ? 'linkcheck' : 'export';
		$opt = leexport_settings_key();

		?>
		<div class="wrap leexport-wrap">
			<h1><?php echo esc_html__('LeExport', 'leexport'); ?></h1>
			<p class="leexport-intro">
				<?php
				echo esc_html__('Plugin details:', 'leexport');
				echo ' ';
				?>
				<a href="<?php echo esc_url('https://www.lezaiyun.com/leexport.html'); ?>" target="_blank" rel="noopener noreferrer"><?php echo esc_html__('Plugin page', 'leexport'); ?></a>
				<?php echo esc_html__(' 公众号: 老蒋朋友圈', 'leexport'); ?>
			</p>

			<nav class="nav-tab-wrapper leexport-tabs-nav" role="tablist" aria-label="<?php echo esc_attr__('LeExport sections', 'leexport'); ?>">
				<a href="<?php echo esc_url(admin_url('options-general.php?page=leexport&tab=export')); ?>#leexport-tab-export"
					class="nav-tab<?php echo $active_tab === 'export' ? ' nav-tab-active' : ''; ?>"
					data-leexport-tab="export"
					role="tab"
					aria-selected="<?php echo $active_tab === 'export' ? 'true' : 'false'; ?>"
					aria-controls="leexport-tab-export"
					id="leexport-tab-export-trigger">
					<?php echo esc_html__('Export settings', 'leexport'); ?>
				</a>
				<a href="<?php echo esc_url(admin_url('options-general.php?page=leexport&tab=linkcheck')); ?>#leexport-tab-linkcheck"
					class="nav-tab<?php echo $active_tab === 'linkcheck' ? ' nav-tab-active' : ''; ?>"
					data-leexport-tab="linkcheck"
					role="tab"
					aria-selected="<?php echo $active_tab === 'linkcheck' ? 'true' : 'false'; ?>"
					aria-controls="leexport-tab-linkcheck"
					id="leexport-tab-linkcheck-trigger">
					<?php echo esc_html__('Dead link detection', 'leexport'); ?>
				</a>
			</nav>

			<div class="leexport-tab-panels">
				<div id="leexport-tab-export" class="leexport-card leexport-tab-panel<?php echo $active_tab === 'export' ? ' is-active' : ''; ?>" data-leexport-panel="export" role="tabpanel" aria-labelledby="leexport-tab-export-trigger"<?php echo $active_tab === 'export' ? '' : ' hidden'; ?>>
					<p class="description"><?php echo esc_html__('Select what to export, then download CSV for SEO submissions.', 'leexport'); ?></p>

					<form method="post" action="options.php">
						<?php settings_fields('leexport'); ?>

						<h3><?php echo esc_html__('Content types', 'leexport'); ?></h3>
						<div class="leexport-checkgrid">
							<?php foreach ($post_types as $pt => $obj) : ?>
								<label>
									<input type="checkbox" name="<?php echo esc_attr($opt); ?>[post_types][]" value="<?php echo esc_attr($pt); ?>" <?php checked(in_array($pt, $settings['post_types'], true)); ?> />
									<span><?php echo esc_html($obj->labels->singular_name); ?></span>
								</label>
							<?php endforeach; ?>
						</div>

						<h3><?php echo esc_html__('Export filters', 'leexport'); ?></h3>
						<p class="description"><?php echo esc_html__('Narrow exported content. Leave blank to include all matching published posts.', 'leexport'); ?></p>
						<div class="leexport-filters">
							<p class="leexport-filterdates">
								<label for="leexport_date_from"><?php echo esc_html__('Published from', 'leexport'); ?></label>
								<input id="leexport_date_from" type="date" name="<?php echo esc_attr($opt); ?>[filters][date_from]" value="<?php echo esc_attr((string)($settings['filters']['date_from'] ?? '')); ?>" />
								<label for="leexport_date_to"><?php echo esc_html__('Published to', 'leexport'); ?></label>
								<input id="leexport_date_to" type="date" name="<?php echo esc_attr($opt); ?>[filters][date_to]" value="<?php echo esc_attr((string)($settings['filters']['date_to'] ?? '')); ?>" />
							</p>
							<p class="leexport-twoinputs">
								<label>
									<span><?php echo esc_html__('Post ID from', 'leexport'); ?></span>
									<input type="number" min="0" step="1" name="<?php echo esc_attr($opt); ?>[filters][id_min]" value="<?php echo esc_attr((string)(int)($settings['filters']['id_min'] ?? 0)); ?>" />
								</label>
								<label>
									<span><?php echo esc_html__('Post ID to', 'leexport'); ?></span>
									<input type="number" min="0" step="1" name="<?php echo esc_attr($opt); ?>[filters][id_max]" value="<?php echo esc_attr((string)(int)($settings['filters']['id_max'] ?? 0)); ?>" />
								</label>
							</p>
							<p class="description"><?php echo esc_html__('ID range uses inclusive bounds. Use 0 to ignore a bound.', 'leexport'); ?></p>

							<h4><?php echo esc_html__('Categories', 'leexport'); ?></h4>
							<?php if ($categories === []) : ?>
								<p class="description"><?php echo esc_html__('No categories found.', 'leexport'); ?></p>
							<?php else : ?>
								<div class="leexport-checkgrid leexport-checkgrid--cats">
									<?php
									$selected_cats = isset($settings['filters']['category_ids']) && is_array($settings['filters']['category_ids'])
										? array_map('intval', $settings['filters']['category_ids'])
										: [];
									foreach ($categories as $cat) :
										if (!($cat instanceof WP_Term)) {
											continue;
										}
										?>
										<label>
											<input type="checkbox" name="<?php echo esc_attr($opt); ?>[filters][category_ids][]" value="<?php echo esc_attr((string)$cat->term_id); ?>" <?php checked(in_array((int)$cat->term_id, $selected_cats, true)); ?> />
											<span><?php echo esc_html($cat->name); ?></span>
										</label>
									<?php endforeach; ?>
								</div>
								<p class="description"><?php echo esc_html__('Leave all unchecked to include every category. Category filter uses the “category” taxonomy.', 'leexport'); ?></p>
							<?php endif; ?>

							<?php if ($topic_taxonomy_options !== []) : ?>
								<h4><?php echo esc_html__('Topics (专题)', 'leexport'); ?></h4>
								<?php if (count($topic_taxonomy_options) > 1) : ?>
									<p>
										<label for="leexport_topic_taxonomy"><?php echo esc_html__('Topic taxonomy', 'leexport'); ?></label>
										<select id="leexport_topic_taxonomy" name="<?php echo esc_attr($opt); ?>[filters][topic_taxonomy]">
											<option value=""><?php echo esc_html__('Auto-detect', 'leexport'); ?></option>
											<?php
											$saved_topic_tax = sanitize_key((string)($settings['filters']['topic_taxonomy'] ?? ''));
											foreach ($topic_taxonomy_options as $tax_slug => $tax_label) :
												?>
												<option value="<?php echo esc_attr($tax_slug); ?>" <?php selected($saved_topic_tax, $tax_slug); ?>><?php echo esc_html($tax_label); ?></option>
											<?php endforeach; ?>
										</select>
									</p>
								<?php else : ?>
									<input type="hidden" name="<?php echo esc_attr($opt); ?>[filters][topic_taxonomy]" value="<?php echo esc_attr((string)array_key_first($topic_taxonomy_options)); ?>" />
									<p class="description">
										<?php
										echo esc_html(
											sprintf(
												/* translators: %s: taxonomy label */
												__('Using taxonomy: %s', 'leexport'),
												(string)reset($topic_taxonomy_options)
											)
										);
										?>
									</p>
								<?php endif; ?>

								<?php if ($topic_terms === []) : ?>
									<p class="description"><?php echo esc_html__('No topics found for the selected taxonomy.', 'leexport'); ?></p>
								<?php else : ?>
									<div class="leexport-checkgrid leexport-checkgrid--cats">
										<?php
										$selected_topics = isset($settings['filters']['topic_ids']) && is_array($settings['filters']['topic_ids'])
											? array_map('intval', $settings['filters']['topic_ids'])
											: [];
										foreach ($topic_terms as $term) :
											if (!($term instanceof WP_Term)) {
												continue;
											}
											?>
											<label>
												<input type="checkbox" name="<?php echo esc_attr($opt); ?>[filters][topic_ids][]" value="<?php echo esc_attr((string)$term->term_id); ?>" <?php checked(in_array((int)$term->term_id, $selected_topics, true)); ?> />
												<span><?php echo esc_html($term->name); ?></span>
											</label>
										<?php endforeach; ?>
									</div>
									<p class="description"><?php echo esc_html__('Leave all unchecked to include every topic. Works together with category filter (AND).', 'leexport'); ?></p>
								<?php endif; ?>
							<?php else : ?>
								<h4><?php echo esc_html__('Topics (专题)', 'leexport'); ?></h4>
								<p class="description"><?php echo esc_html__('No topic taxonomy detected on this site. Register a taxonomy such as “topic” or one labeled 专题 to enable this filter.', 'leexport'); ?></p>
							<?php endif; ?>
						</div>

						<h3><?php echo esc_html__('Fields', 'leexport'); ?></h3>
						<div class="leexport-checkgrid">
							<?php
							$fields = [
								'id' => __('ID', 'leexport'),
								'title' => __('Title', 'leexport'),
								'url' => __('URL', 'leexport'),
								'categories' => __('Categories (names)', 'leexport'),
								'category_urls' => __('Category URLs', 'leexport'),
								'tags' => __('Tags (names)', 'leexport'),
								'tag_urls' => __('Tag URLs', 'leexport'),
								'published_date' => __('Published Date', 'leexport'),
							];
							if ($active_topic_taxonomy !== '') {
								$topic_label = $topic_taxonomy_options[$active_topic_taxonomy] ?? __('Topics', 'leexport');
								/* translators: %s: topic taxonomy label, e.g. Topics */
								$fields['topics'] = sprintf(__('%s (names)', 'leexport'), $topic_label);
								/* translators: %s: topic taxonomy label, e.g. Topics */
								$fields['topic_urls'] = sprintf(__('%s URLs', 'leexport'), $topic_label);
							}
							foreach ($fields as $k => $label) :
								?>
								<label>
									<input type="checkbox" name="<?php echo esc_attr($opt); ?>[fields][<?php echo esc_attr($k); ?>]" value="1" <?php checked(!empty($settings['fields'][$k])); ?> />
									<span><?php echo esc_html($label); ?></span>
								</label>
							<?php endforeach; ?>
						</div>

						<h3><?php echo esc_html__('Large export', 'leexport'); ?></h3>
						<p>
							<label for="leexport_split_rows"><?php echo esc_html__('Rows per file', 'leexport'); ?></label><br />
							<input id="leexport_split_rows" type="number" min="0" max="100000" step="1" name="<?php echo esc_attr($opt); ?>[export][split_rows]" value="<?php echo esc_attr((string)($settings['export']['split_rows'] ?? 10000)); ?>" class="small-text" />
						</p>
						<p class="description"><?php echo esc_html__('When total rows exceed this limit, export is split into multiple files inside a ZIP (default 10000). Enter 0 to always export one file.', 'leexport'); ?></p>

						<?php submit_button(__('Save settings', 'leexport')); ?>
					</form>

					<hr />

					<h2><?php echo esc_html__('Export', 'leexport'); ?></h2>
					<p class="description">
						<?php
						echo esc_html(
							sprintf(
								/* translators: %d: number of posts matching current filters */
								__('Current filters match %d published item(s). Save settings after changing filters.', 'leexport'),
								$filter_match_count
							)
						);
						?>
					</p>
					<form method="post" action="<?php echo esc_url(admin_url('admin-post.php')); ?>">
						<input type="hidden" name="action" value="leexport_export_csv" />
						<?php wp_nonce_field('leexport_export_csv'); ?>
						<?php submit_button(__('Download CSV', 'leexport'), 'primary', 'submit', false); ?>
						<span class="description"><?php echo esc_html__('Uses the saved settings above.', 'leexport'); ?></span>
					</form>

					<form method="post" action="<?php echo esc_url(admin_url('admin-post.php')); ?>" class="leexport-inline">
						<input type="hidden" name="action" value="leexport_export_url_txt" />
						<?php wp_nonce_field('leexport_export_url_txt'); ?>
						<?php submit_button(__('Download URL list (TXT)', 'leexport'), 'secondary', 'submit', false); ?>
						<span class="description"><?php echo esc_html__('One URL per line, based on saved settings.', 'leexport'); ?></span>
					</form>

					<form method="post" action="<?php echo esc_url(admin_url('admin-post.php')); ?>" class="leexport-inline">
						<input type="hidden" name="action" value="leexport_export_url_csv" />
						<?php wp_nonce_field('leexport_export_url_csv'); ?>
						<?php submit_button(__('Download URL list (CSV)', 'leexport'), 'secondary', 'submit', false); ?>
						<span class="description"><?php echo esc_html__('Single-column CSV, based on saved settings.', 'leexport'); ?></span>
					</form>
				</div>

				<div id="leexport-tab-linkcheck" class="leexport-card leexport-tab-panel<?php echo $active_tab === 'linkcheck' ? ' is-active' : ''; ?>" data-leexport-panel="linkcheck" role="tabpanel" aria-labelledby="leexport-tab-linkcheck-trigger"<?php echo $active_tab === 'linkcheck' ? '' : ' hidden'; ?>>
					<p class="description"><?php echo esc_html__('Batch scan with progress. Choose site URLs or links found inside content.', 'leexport'); ?></p>

					<form method="post" action="options.php">
						<?php settings_fields('leexport'); ?>
						<table class="form-table" role="presentation">
							<tr>
								<th scope="row"><?php echo esc_html__('Enable', 'leexport'); ?></th>
								<td>
									<label>
										<input type="checkbox" name="<?php echo esc_attr($opt); ?>[link_check][enabled]" value="1" <?php checked(!empty($settings['link_check']['enabled'])); ?> />
										<span><?php echo esc_html__('Enable link check tools', 'leexport'); ?></span>
									</label>
								</td>
							</tr>
							<tr>
								<th scope="row"><label for="leexport_max_items"><?php echo esc_html__('Max items per scan', 'leexport'); ?></label></th>
								<td>
									<input id="leexport_max_items" type="number" min="1" max="500" name="<?php echo esc_attr($opt); ?>[link_check][max_items]" value="<?php echo esc_attr((string)$settings['link_check']['max_items']); ?>" />
									<p class="description"><?php echo esc_html__('In content scan mode, this limits how many newest posts are parsed for links.', 'leexport'); ?></p>
								</td>
							</tr>
							<tr>
								<th scope="row"><?php echo esc_html__('Content link scope', 'leexport'); ?></th>
								<td>
									<label style="display:inline-block;margin-right:14px;">
										<input type="checkbox" name="<?php echo esc_attr($opt); ?>[link_check][include_external]" value="1" <?php checked(!empty($settings['link_check']['include_external'])); ?> />
										<span><?php echo esc_html__('Include external links', 'leexport'); ?></span>
									</label>
									<label style="display:inline-block;">
										<input type="checkbox" name="<?php echo esc_attr($opt); ?>[link_check][include_internal]" value="1" <?php checked(!empty($settings['link_check']['include_internal'])); ?> />
										<span><?php echo esc_html__('Include internal links', 'leexport'); ?></span>
									</label>
									<p class="description"><?php echo esc_html__('Applies to “content links” scan mode only.', 'leexport'); ?></p>
								</td>
							</tr>
							<tr>
								<th scope="row"><label for="leexport_max_links"><?php echo esc_html__('Max unique links (content mode)', 'leexport'); ?></label></th>
								<td>
									<input id="leexport_max_links" type="number" min="50" max="5000" name="<?php echo esc_attr($opt); ?>[link_check][max_links]" value="<?php echo esc_attr((string)$settings['link_check']['max_links']); ?>" />
								</td>
							</tr>
							<tr>
								<th scope="row"><?php echo esc_html__('Batch sizes', 'leexport'); ?></th>
								<td class="leexport-twoinputs">
									<label>
										<span><?php echo esc_html__('Posts per step', 'leexport'); ?></span>
										<input type="number" min="1" max="50" name="<?php echo esc_attr($opt); ?>[link_check][batch_posts]" value="<?php echo esc_attr((string)$settings['link_check']['batch_posts']); ?>" />
									</label>
									<label>
										<span><?php echo esc_html__('URLs per step', 'leexport'); ?></span>
										<input type="number" min="1" max="100" name="<?php echo esc_attr($opt); ?>[link_check][batch_urls]" value="<?php echo esc_attr((string)$settings['link_check']['batch_urls']); ?>" />
									</label>
									<p class="description"><?php echo esc_html__('Lower these if your server is slow or requests time out.', 'leexport'); ?></p>
								</td>
							</tr>
							<tr>
								<th scope="row"><label for="leexport_timeout"><?php echo esc_html__('Request timeout (seconds)', 'leexport'); ?></label></th>
								<td>
									<input id="leexport_timeout" type="number" min="2" max="30" name="<?php echo esc_attr($opt); ?>[link_check][timeout]" value="<?php echo esc_attr((string)$settings['link_check']['timeout']); ?>" />
								</td>
							</tr>
							<tr>
								<th scope="row"><?php echo esc_html__('Network safety', 'leexport'); ?></th>
								<td>
									<label>
										<input type="checkbox" name="<?php echo esc_attr($opt); ?>[link_check][allow_private_targets]" value="1" <?php checked(!empty($settings['link_check']['allow_private_targets'])); ?> />
										<span><?php echo esc_html__('Allow private/internal targets (not recommended)', 'leexport'); ?></span>
									</label>
									<p class="description"><?php echo esc_html__('When disabled, localhost/private/reserved addresses are blocked and shown as “Blocked”.', 'leexport'); ?></p>
								</td>
							</tr>
							<tr>
								<th scope="row"><label for="leexport_ua"><?php echo esc_html__('User-Agent', 'leexport'); ?></label></th>
								<td>
									<input id="leexport_ua" type="text" class="regular-text" name="<?php echo esc_attr($opt); ?>[link_check][user_agent]" value="<?php echo esc_attr((string)$settings['link_check']['user_agent']); ?>" />
								</td>
							</tr>
						</table>
						<?php submit_button(__('Save link check settings', 'leexport'), 'secondary'); ?>
					</form>

					<hr />

					<?php if (empty($settings['link_check']['enabled'])) : ?>
						<p class="leexport-note"><?php echo esc_html__('Link check is disabled. Enable it above to run scans.', 'leexport'); ?></p>
					<?php else : ?>
						<div class="leexport-scanpanel" data-leexport-scan>
							<label for="leexport_scan_mode"><strong><?php echo esc_html__('Scan mode', 'leexport'); ?></strong></label>
							<select id="leexport_scan_mode">
								<option value="site_urls"><?php echo esc_html__('Site URLs (permalinks)', 'leexport'); ?></option>
								<option value="content_links"><?php echo esc_html__('Content links (href/src in posts)', 'leexport'); ?></option>
							</select>
							<div class="leexport-actions">
								<button type="button" class="button button-primary" data-leexport-start><?php echo esc_html__('Start scan', 'leexport'); ?></button>
								<button type="button" class="button" data-leexport-cancel disabled><?php echo esc_html__('Cancel', 'leexport'); ?></button>
							</div>
							<div class="leexport-progress" aria-live="polite">
								<div class="leexport-progressbar"><div class="leexport-progressbar__fill" style="width:0%"></div></div>
								<div class="leexport-progressmeta" data-leexport-meta><?php echo esc_html__('Idle.', 'leexport'); ?></div>
							</div>
							<pre class="leexport-log" data-leexport-log style="display:none;"></pre>
						</div>
					<?php endif; ?>

					<?php if (is_array($link_scan) && !empty($link_scan['items'])) : ?>
						<hr />
						<h3><?php echo esc_html__('Latest scan', 'leexport'); ?></h3>
						<p class="description">
							<?php
							$ts = isset($link_scan['ts']) ? (int)$link_scan['ts'] : 0;
							$mode = isset($link_scan['mode']) ? (string)$link_scan['mode'] : 'site_urls';
							$label = $mode === 'content_links' ? __('Content links', 'leexport') : __('Site URLs', 'leexport');
							/* translators: 1: scan mode label, 2: URL count, 3: datetime */
							echo esc_html(sprintf(__('%1$s: scanned %2$d URLs at %3$s.', 'leexport'), $label, (int)$link_scan['count'], $ts ? wp_date('Y-m-d H:i:s', $ts) : '-'));
							?>
						</p>

						<div class="leexport-tablewrap">
							<table class="widefat fixed striped">
								<thead>
									<tr>
										<th><?php echo esc_html__('Status', 'leexport'); ?></th>
										<th><?php echo esc_html__('Code', 'leexport'); ?></th>
										<th><?php echo esc_html__('URL', 'leexport'); ?></th>
										<th><?php echo esc_html__('Internal', 'leexport'); ?></th>
									</tr>
								</thead>
								<tbody>
									<?php foreach ($link_scan['items'] as $item) : ?>
										<?php
										$is_blocked = !empty($item['blocked']);
										$row_class = $is_blocked ? 'leexport-blocked' : (empty($item['ok']) ? 'leexport-bad' : 'leexport-ok');
										$status_text = $is_blocked ? __('Blocked', 'leexport') : (empty($item['ok']) ? __('Bad', 'leexport') : __('OK', 'leexport'));
										?>
										<tr class="<?php echo esc_attr($row_class); ?>">
											<td><?php echo esc_html($status_text); ?></td>
											<td><?php echo esc_html((string)($item['code'] ?? '')); ?></td>
											<td><a href="<?php echo esc_url((string)($item['url'] ?? '')); ?>" target="_blank" rel="noreferrer noopener"><?php echo esc_html((string)($item['url'] ?? '')); ?></a></td>
											<td><?php echo !empty($item['internal']) ? esc_html__('Yes', 'leexport') : esc_html__('No', 'leexport'); ?></td>
										</tr>
									<?php endforeach; ?>
								</tbody>
							</table>
						</div>

						<form method="post" action="<?php echo esc_url(admin_url('admin-post.php')); ?>">
							<input type="hidden" name="action" value="leexport_export_link_scan_csv" />
							<?php wp_nonce_field('leexport_export_link_scan_csv'); ?>
							<?php submit_button(__('Download scan CSV', 'leexport'), 'secondary'); ?>
						</form>
					<?php endif; ?>
				</div>
			</div>

			<div class="leexport-follow">
				<img
					class="leexport-follow__qr"
					src="<?php echo esc_url(LEEXPORT_URL . 'assets/images/wechat.png'); ?>"
					alt="<?php echo esc_attr__('WeChat QR code', 'leexport'); ?>"
					width="160"
					height="160"
					loading="lazy"
					decoding="async"
				/>
				<p class="leexport-follow__slogan"><?php echo esc_html__('关注「老蒋朋友圈」聊 网站、运营、创业、AI。', 'leexport'); ?></p>
				<p class="leexport-follow__copy">
					<?php echo esc_html__('2026 ©', 'leexport'); ?>
					<a href="<?php echo esc_url('https://www.lezaiyun.com/'); ?>" target="_blank" rel="noopener noreferrer"><?php echo esc_html__('乐在云', 'leexport'); ?></a>
					· By
					<a href="<?php echo esc_url('https://www.laojiang.me/'); ?>" target="_blank" rel="noopener noreferrer"><?php echo esc_html__('老蒋', 'leexport'); ?></a>
				</p>
			</div>
		</div>
		<?php
	}

	public function handle_export_csv(): void {
		if (!current_user_can('manage_options')) {
			wp_die(esc_html__('Insufficient permissions.', 'leexport'));
		}
		check_admin_referer('leexport_export_csv');

		$settings = leexport_get_settings();
		$basename = 'leexport-' . wp_date('Ymd-His');
		LeExport_Exporter::output_posts_csv_download($settings, $basename);
		exit;
	}

	public function handle_export_link_scan_csv(): void {
		if (!current_user_can('manage_options')) {
			wp_die(esc_html__('Insufficient permissions.', 'leexport'));
		}
		check_admin_referer('leexport_export_link_scan_csv');

		$scan = get_transient('leexport_link_scan_latest');
		if (!is_array($scan) || empty($scan['items']) || !is_array($scan['items'])) {
			wp_safe_redirect(admin_url('options-general.php?page=leexport&tab=linkcheck'));
			exit;
		}

		$headers = ['Status', 'URL', 'Internal', 'OK', 'HTTP Code', 'Message'];
		$rows = [];
		foreach ($scan['items'] as $it) {
			$blocked = !empty($it['blocked']);
			$status = $blocked ? 'Blocked' : (empty($it['ok']) ? 'Bad' : 'OK');
			$rows[] = [
				$status,
				(string)($it['url'] ?? ''),
				empty($it['internal']) ? '0' : '1',
				empty($it['ok']) ? '0' : '1',
				(string)($it['code'] ?? ''),
				(string)($it['message'] ?? ''),
			];
		}

		$settings = leexport_get_settings();
		$basename = 'leexport-link-scan-' . wp_date('Ymd-His') . '.csv';
		$split_rows = leexport_split_rows_limit($settings);
		LeExport_Exporter::output_csv_download($basename, $headers, $rows, $split_rows);
		exit;
	}

	public function handle_export_url_txt(): void {
		if (!current_user_can('manage_options')) {
			wp_die(esc_html__('Insufficient permissions.', 'leexport'));
		}
		check_admin_referer('leexport_export_url_txt');

		$settings = leexport_get_settings();
		$basename = 'leexport-urls-' . wp_date('Ymd-His');
		LeExport_Exporter::output_url_txt_download($settings, $basename);
	}

	public function handle_export_url_csv(): void {
		if (!current_user_can('manage_options')) {
			wp_die(esc_html__('Insufficient permissions.', 'leexport'));
		}
		check_admin_referer('leexport_export_url_csv');

		$settings = leexport_get_settings();
		$basename = 'leexport-urls-' . wp_date('Ymd-His');
		LeExport_Exporter::output_url_csv_download($settings, $basename);
	}

	private function ajax_require_permissions(): void {
		if (!current_user_can('manage_options')) {
			wp_send_json_error(['message' => 'forbidden'], 403);
		}
		check_ajax_referer('leexport_ajax', 'nonce');
	}

	public function ajax_scan_start(): void {
		$this->ajax_require_permissions();
		$settings = leexport_get_settings();
		if (empty($settings['link_check']['enabled'])) {
			wp_send_json_error(['message' => 'disabled'], 400);
		}

		$mode = isset($_POST['mode']) ? sanitize_key(wp_unslash((string)$_POST['mode'])) : 'site_urls'; // phpcs:ignore WordPress.Security.NonceVerification.Missing -- Verified in ajax_require_permissions().
		$user_id = get_current_user_id();
		$job = LeExport_Scan_Jobs::start_job($user_id, $settings, $mode);
		wp_send_json_success(['job' => $job]);
	}

	public function ajax_scan_poll(): void {
		$this->ajax_require_permissions();
		$settings = leexport_get_settings();
		$user_id = get_current_user_id();

		$batch_posts = (int)($settings['link_check']['batch_posts'] ?? 10);
		$batch_urls = (int)($settings['link_check']['batch_urls'] ?? 25);
		$job = LeExport_Scan_Jobs::run_batch($user_id, $settings, $batch_posts, $batch_urls);
		wp_send_json_success(['job' => $job]);
	}

	public function ajax_scan_cancel(): void {
		$this->ajax_require_permissions();
		$user_id = get_current_user_id();
		LeExport_Scan_Jobs::clear_job($user_id);
		wp_send_json_success(['ok' => true]);
	}
}