<?php
/**
 * Duolangue — Settings.
 *
 * Single option `duolangue_settings`, the top-level admin page with its tabs,
 * the admin interface language (global + per-user) and the EN/FR UI toggle.
 */

defined( 'ABSPATH' ) || exit;

class Duolangue_Settings {

	const OPTION    = 'duolangue_settings';
	const USER_META = '_duolangue_admin_lang';
	const PAGE      = 'duolangue';

	public function __construct() {
		add_action( 'admin_menu', array( $this, 'register_menu' ) );
		add_action( 'admin_post_duolangue_save_settings', array( $this, 'handle_save' ) );
		add_action( 'admin_post_duolangue_toggle_ui', array( $this, 'handle_toggle_ui' ) );
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue' ) );
		add_filter( 'determine_locale', array( $this, 'filter_admin_locale' ), 20 );
		add_action( 'admin_notices', array( $this, 'notices' ) );
	}

	/* ------------------------------------------------------------------ */

	public static function defaults() {
		return array(
			'languages'           => array(
				array( 'code' => 'en', 'name' => 'English',  'locale' => 'en_CA', 'default' => true ),
				array( 'code' => 'fr', 'name' => 'Français', 'locale' => 'fr_CA', 'default' => false ),
			),
			'url_mode'            => 'directory', // 'directory' | 'param'
			'bases'               => array(
				'post_type' => array(),
				'taxonomy'  => array(),
			),
			'admin_lang'          => 'en', // 'en' | 'fr' (interface of Duolangue screens)
			'admin_lang_per_user' => true,
			'switcher_display'    => 'name',    // 'name' (Français) | 'code' (FR)
			'menu_locations'      => array(),   // theme locations, or '_all' for every menu
			'menu_display'        => 'code',    // 'name' | 'code'
			'menu_show'           => 'other',   // 'other' | 'both'
		);
	}

	public static function get() {
		$settings = get_option( self::OPTION, array() );
		$settings = wp_parse_args( is_array( $settings ) ? $settings : array(), self::defaults() );

		// Duolangue's data model is a language pair: the default language
		// (served at the site root) and the second language (served under its
		// own prefix). Rebuild the pair from whatever is stored.
		$stored   = array_values( (array) $settings['languages'] );
		$defaults = self::defaults()['languages'];
		$settings['languages'] = array(
			isset( $stored[0] ) && is_array( $stored[0] ) ? wp_parse_args( $stored[0], $defaults[0] ) : $defaults[0],
			isset( $stored[1] ) && is_array( $stored[1] ) ? wp_parse_args( $stored[1], $defaults[1] ) : $defaults[1],
		);

		return $settings;
	}

	public static function update( $settings ) {
		update_option( self::OPTION, $settings );
	}

	/**
	 * Effective language of the Duolangue admin interface for the current user.
	 *
	 * @return string 'en' | 'fr'
	 */
	public static function admin_ui_lang() {
		$settings = self::get();
		if ( ! empty( $settings['admin_lang_per_user'] ) ) {
			$user_pref = get_user_meta( get_current_user_id(), self::USER_META, true );
			if ( in_array( $user_pref, array( 'en', 'fr' ), true ) ) {
				return $user_pref;
			}
		}
		return in_array( $settings['admin_lang'], array( 'en', 'fr' ), true ) ? $settings['admin_lang'] : 'en';
	}

	/**
	 * Curated list of installable WordPress locales, filterable.
	 */
	public static function locales() {
		return apply_filters( 'duolangue_locales', array(
			'en_US' => 'English (United States)',
			'en_CA' => 'English (Canada)',
			'en_GB' => 'English (United Kingdom)',
			'en_AU' => 'English (Australia)',
			'en_NZ' => 'English (New Zealand)',
			'en_ZA' => 'English (South Africa)',
			'fr_CA' => 'Français (Canada)',
			'fr_FR' => 'Français (France)',
			'fr_BE' => 'Français (Belgique)',
			'es_ES' => 'Español (España)',
			'es_MX' => 'Español (México)',
			'de_DE' => 'Deutsch',
			'de_CH' => 'Deutsch (Schweiz)',
			'it_IT' => 'Italiano',
			'pt_PT' => 'Português (Portugal)',
			'pt_BR' => 'Português (Brasil)',
			'nl_NL' => 'Nederlands',
			'nl_BE' => 'Nederlands (België)',
			'sv_SE' => 'Svenska',
			'da_DK' => 'Dansk',
			'nb_NO' => 'Norsk bokmål',
			'fi'    => 'Suomi',
			'pl_PL' => 'Polski',
			'cs_CZ' => 'Čeština',
			'el'    => 'Ελληνικά',
			'ru_RU' => 'Русский',
			'uk'    => 'Українська',
			'ar'    => 'العربية',
			'he_IL' => 'עברית',
			'ja'    => '日本語',
			'ko_KR' => '한국어',
			'zh_CN' => '简体中文',
			'zh_TW' => '繁體中文',
		) );
	}

	/* ------------------------------------------------------------------
	 * Admin UI language plumbing
	 * ---------------------------------------------------------------- */

	/**
	 * Is the current request one of the Duolangue admin screens?
	 */
	public static function is_plugin_screen() {
		return is_admin() && isset( $_GET['page'] ) && self::PAGE === sanitize_key( wp_unslash( $_GET['page'] ) ); // phpcs:ignore WordPress.Security.NonceVerification -- read-only screen detection.
	}

	/**
	 * On Duolangue screens, render the whole page in the chosen interface
	 * language so the native .mo files (core + duolangue) do the work.
	 */
	public function filter_admin_locale( $locale ) {
		if ( ! self::is_plugin_screen() ) {
			return $locale;
		}
		$ui   = self::admin_ui_lang();
		$lang = duolangue_get_language( $ui );
		if ( $lang && ! empty( $lang['locale'] ) ) {
			return $lang['locale'];
		}
		// Sensible fallbacks when the site languages don't include en/fr.
		return 'fr' === $ui ? 'fr_CA' : 'en_US';
	}

	/**
	 * EN | FR segmented toggle shown top-right of every Duolangue screen.
	 */
	public static function render_ui_toggle() {
		$current = self::admin_ui_lang();
		$tab     = isset( $_GET['tab'] ) ? sanitize_key( wp_unslash( $_GET['tab'] ) ) : 'settings'; // phpcs:ignore WordPress.Security.NonceVerification
		?>
		<div class="duolangue-ui-toggle-wrap">
			<span class="duolangue-ui-toggle-label"><?php esc_html_e( 'Interface', 'duolangue' ); ?></span>
			<span class="duolangue-ui-toggle">
				<?php foreach ( array( 'en' => 'EN', 'fr' => 'FR' ) as $code => $label ) :
					$url = wp_nonce_url(
						admin_url( 'admin-post.php?action=duolangue_toggle_ui&ui=' . $code . '&tab=' . $tab ),
						'duolangue_toggle_ui'
					);
					?>
					<a href="<?php echo esc_url( $url ); ?>"
						class="<?php echo esc_attr( $current === $code ? 'is-active' : '' ); ?>"
						aria-current="<?php echo esc_attr( $current === $code ? 'true' : 'false' ); ?>"><?php echo esc_html( $label ); ?></a>
				<?php endforeach; ?>
			</span>
		</div>
		<?php
	}

	public function handle_toggle_ui() {
		check_admin_referer( 'duolangue_toggle_ui' );
		if ( ! current_user_can( 'manage_options' ) ) {
			wp_die( esc_html__( 'You are not allowed to do that.', 'duolangue' ) );
		}

		$ui  = isset( $_GET['ui'] ) && 'fr' === sanitize_key( wp_unslash( $_GET['ui'] ) ) ? 'fr' : 'en';
		$tab = isset( $_GET['tab'] ) ? sanitize_key( wp_unslash( $_GET['tab'] ) ) : 'settings';

		$settings = self::get();
		if ( ! empty( $settings['admin_lang_per_user'] ) ) {
			update_user_meta( get_current_user_id(), self::USER_META, $ui );
		} else {
			$settings['admin_lang'] = $ui;
			self::update( $settings );
		}

		wp_safe_redirect( admin_url( 'admin.php?page=' . self::PAGE . '&tab=' . $tab ) );
		exit;
	}

	/* ------------------------------------------------------------------
	 * Menu + tabs
	 * ---------------------------------------------------------------- */

	public function register_menu() {
		add_menu_page(
			__( 'Duolangue', 'duolangue' ),
			__( 'Duolangue', 'duolangue' ),
			'manage_options',
			self::PAGE,
			array( $this, 'render_page' ),
			'dashicons-translation',
			61
		);
	}

	public function enqueue( $hook ) {
		if ( 'toplevel_page_' . self::PAGE !== $hook ) {
			return;
		}
		wp_enqueue_style( 'duolangue-admin', DUOLANGUE_URL . 'assets/css/admin.css', array(), DUOLANGUE_VERSION );
	}

	public function notices() {
		if ( ! self::is_plugin_screen() || empty( $_GET['duolangue_msg'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification
			return;
		}
		$msg = sanitize_key( wp_unslash( $_GET['duolangue_msg'] ) ); // phpcs:ignore WordPress.Security.NonceVerification
		$map = array(
			'settings_saved' => __( 'Settings saved.', 'duolangue' ),
			'slugs_saved'    => __( 'URL bases saved and permalinks flushed.', 'duolangue' ),
		);
		/**
		 * Success messages shown on the Duolangue screens (?duolangue_msg=key).
		 *
		 * @param string[] $map Message key => text.
		 */
		$map = (array) apply_filters( 'duolangue_admin_messages', $map );
		if ( isset( $map[ $msg ] ) ) {
			printf( '<div class="notice notice-success is-dismissible"><p>%s</p></div>', esc_html( $map[ $msg ] ) );
		}
	}

	public function render_page() {
		$tab  = isset( $_GET['tab'] ) ? sanitize_key( wp_unslash( $_GET['tab'] ) ) : 'settings'; // phpcs:ignore WordPress.Security.NonceVerification
		$tabs = array(
			'settings' => __( 'Settings', 'duolangue' ),
			'slugs'    => __( 'Slugs & URLs', 'duolangue' ),
		);
		$tabs['pages'] = __( 'Pages & editor', 'duolangue' );
		/**
		 * Tabs of the Duolangue admin screen (slug => label). A tab added here
		 * is rendered through the "duolangue_render_tab_{$slug}" action.
		 *
		 * @param string[] $tabs
		 */
		$tabs = (array) apply_filters( 'duolangue_admin_tabs', $tabs );
		if ( ! isset( $tabs[ $tab ] ) ) {
			$tab = 'settings';
		}
		?>
		<div class="wrap duolangue-wrap">
			<div class="duolangue-header">
				<div>
					<h1><?php esc_html_e( 'Duolangue', 'duolangue' ); ?></h1>
					<p class="duolangue-tagline"><?php esc_html_e( 'A bilingual WordPress site, kept simple.', 'duolangue' ); ?></p>
				</div>
				<?php self::render_ui_toggle(); ?>
			</div>

			<nav class="nav-tab-wrapper">
				<?php foreach ( $tabs as $slug => $label ) : ?>
					<a href="<?php echo esc_url( admin_url( 'admin.php?page=' . self::PAGE . '&tab=' . $slug ) ); ?>"
						class="nav-tab <?php echo $tab === $slug ? 'nav-tab-active' : ''; ?>"><?php echo esc_html( $label ); ?></a>
				<?php endforeach; ?>
			</nav>

			<div class="duolangue-tab-content">
				<?php
				switch ( $tab ) {
					case 'slugs':
						Duolangue_Slugs::render_screen();
						break;
					case 'pages':
						self::render_pages_overview();
						break;
					case 'settings':
						$this->render_settings_tab();
						break;
					default:
						do_action( 'duolangue_render_tab_' . $tab );
				}
				?>
			</div>
		</div>
		<?php
	}

	/* ------------------------------------------------------------------
	 * Tab 1 — Settings
	 * ---------------------------------------------------------------- */

	private function render_settings_tab() {
		$settings = self::get();
		$locales  = self::locales();
		?>
		<form method="post" action="<?php echo esc_url( admin_url( 'admin-post.php' ) ); ?>">
			<?php wp_nonce_field( 'duolangue_save_settings' ); ?>
			<input type="hidden" name="action" value="duolangue_save_settings" />

			<div class="card duolangue-card">
				<h2><?php esc_html_e( 'Site languages', 'duolangue' ); ?></h2>
				<table class="widefat striped duolangue-languages-table">
					<thead>
						<tr>
							<th class="duolangue-col-code"><?php esc_html_e( 'Code', 'duolangue' ); ?></th>
							<th><?php esc_html_e( 'Name', 'duolangue' ); ?></th>
							<th><?php esc_html_e( 'WordPress locale', 'duolangue' ); ?></th>
							<th class="duolangue-col-default"><?php esc_html_e( 'Default', 'duolangue' ); ?></th>
						</tr>
					</thead>
					<tbody>
					<?php foreach ( $settings['languages'] as $i => $lang ) : ?>
						<tr>
							<td>
								<span class="duolangue-lang-dot"><?php echo esc_html( strtoupper( $lang['code'] ) ); ?></span>
								<input type="text" name="languages[<?php echo (int) $i; ?>][code]"
									value="<?php echo esc_attr( $lang['code'] ); ?>"
									class="duolangue-code-input" maxlength="5" pattern="[a-z\-]{2,5}" required />
							</td>
							<td>
								<input type="text" name="languages[<?php echo (int) $i; ?>][name]"
									value="<?php echo esc_attr( $lang['name'] ); ?>" class="regular-text" required />
							</td>
							<td>
								<select name="languages[<?php echo (int) $i; ?>][locale]">
									<?php foreach ( $locales as $code => $label ) : ?>
										<option value="<?php echo esc_attr( $code ); ?>" <?php selected( $lang['locale'], $code ); ?>>
											<?php echo esc_html( $label . ' — ' . $code ); ?>
										</option>
									<?php endforeach; ?>
								</select>
							</td>
							<td class="duolangue-col-default">
								<input type="radio" name="default_lang" value="<?php echo (int) $i; ?>"
									<?php checked( ! empty( $lang['default'] ) ); ?> />
							</td>
						</tr>
					<?php endforeach; ?>
					</tbody>
				</table>
				<p class="description">
					<?php esc_html_e( 'The default language is served at the site root; the other one under its own prefix (e.g. /fr/). Every page can be linked to its counterpart in the other language.', 'duolangue' ); ?>
				</p>
			</div>

			<div class="card duolangue-card">
				<h2><?php esc_html_e( 'Admin interface language', 'duolangue' ); ?></h2>
				<p class="description"><?php esc_html_e( 'Language of the Duolangue screens themselves.', 'duolangue' ); ?></p>
				<p>
					<label>
						<input type="radio" name="admin_lang" value="en" <?php checked( $settings['admin_lang'], 'en' ); ?> />
						English
					</label>
					&nbsp;&nbsp;
					<label>
						<input type="radio" name="admin_lang" value="fr" <?php checked( $settings['admin_lang'], 'fr' ); ?> />
						Français
					</label>
				</p>
				<p>
					<label>
						<input type="checkbox" name="admin_lang_per_user" value="1" <?php checked( ! empty( $settings['admin_lang_per_user'] ) ); ?> />
						<?php esc_html_e( 'Let each user pick their own admin language', 'duolangue' ); ?>
					</label>
				</p>
			</div>

			<div class="card duolangue-card">
				<h2><?php esc_html_e( 'URL structure', 'duolangue' ); ?></h2>
				<div class="duolangue-url-modes">
					<label class="duolangue-url-mode <?php echo 'directory' === $settings['url_mode'] ? 'is-selected' : ''; ?>">
						<input type="radio" name="url_mode" value="directory" <?php checked( $settings['url_mode'], 'directory' ); ?> />
						<span class="duolangue-url-mode-title"><?php esc_html_e( 'Language directory', 'duolangue' ); ?></span>
						<code>mysite.com/ · mysite.com/fr/</code>
						<span class="description"><?php esc_html_e( 'Default language at the root, second language in its own directory. Recommended.', 'duolangue' ); ?></span>
					</label>
					<label class="duolangue-url-mode <?php echo 'param' === $settings['url_mode'] ? 'is-selected' : ''; ?>">
						<input type="radio" name="url_mode" value="param" <?php checked( $settings['url_mode'], 'param' ); ?> />
						<span class="duolangue-url-mode-title"><?php esc_html_e( 'URL parameter', 'duolangue' ); ?></span>
						<code>mysite.com/?lang=fr</code>
						<span class="description"><?php esc_html_e( 'Fallback mode. Translated URL bases are not applied in this mode.', 'duolangue' ); ?></span>
					</label>
				</div>
			</div>

			<div class="card duolangue-card">
				<h2><?php esc_html_e( 'Language switcher & menus', 'duolangue' ); ?></h2>

				<p>
					<label for="duolangue-switcher-display"><strong><?php esc_html_e( 'Switcher label format', 'duolangue' ); ?></strong></label><br />
					<select name="switcher_display" id="duolangue-switcher-display">
						<option value="name" <?php selected( $settings['switcher_display'], 'name' ); ?>><?php esc_html_e( 'Language name (Français)', 'duolangue' ); ?></option>
						<option value="code" <?php selected( $settings['switcher_display'], 'code' ); ?>><?php esc_html_e( 'Language code (FR)', 'duolangue' ); ?></option>
					</select>
					<span class="description"><?php esc_html_e( 'Default format for the [duolangue_switcher] shortcode and template functions. Overridable per call.', 'duolangue' ); ?></span>
				</p>

				<p><strong><?php esc_html_e( 'Add a language link at the end of menus', 'duolangue' ); ?></strong></p>
				<?php
				$locations  = get_registered_nav_menus();
				$selected   = (array) $settings['menu_locations'];
				?>
				<p>
					<label>
						<input type="checkbox" name="menu_locations[]" value="_all" <?php checked( in_array( '_all', $selected, true ) ); ?> />
						<?php esc_html_e( 'All menus (recommended with page builders that register no menu location)', 'duolangue' ); ?>
					</label>
				</p>
				<?php foreach ( $locations as $slug => $label ) : ?>
					<p>
						<label>
							<input type="checkbox" name="menu_locations[]" value="<?php echo esc_attr( $slug ); ?>" <?php checked( in_array( $slug, $selected, true ) ); ?> />
							<?php echo esc_html( $label ); ?> <code><?php echo esc_html( $slug ); ?></code>
						</label>
					</p>
				<?php endforeach; ?>

				<p>
					<label for="duolangue-menu-display"><strong><?php esc_html_e( 'Menu label format', 'duolangue' ); ?></strong></label><br />
					<select name="menu_display" id="duolangue-menu-display">
						<option value="code" <?php selected( $settings['menu_display'], 'code' ); ?>><?php esc_html_e( 'Language code (FR)', 'duolangue' ); ?></option>
						<option value="name" <?php selected( $settings['menu_display'], 'name' ); ?>><?php esc_html_e( 'Language name (Français)', 'duolangue' ); ?></option>
					</select>
					&nbsp;
					<select name="menu_show">
						<option value="other" <?php selected( $settings['menu_show'], 'other' ); ?>><?php esc_html_e( 'Show the other language only', 'duolangue' ); ?></option>
						<option value="both" <?php selected( $settings['menu_show'], 'both' ); ?>><?php esc_html_e( 'Show both languages', 'duolangue' ); ?></option>
					</select>
				</p>
				<p class="description">
					<?php esc_html_e( 'The link points to the translated page when it exists, otherwise to the home page of that language.', 'duolangue' ); ?>
				</p>

				<h3><?php esc_html_e( 'For developers', 'duolangue' ); ?></h3>
				<p class="description">
					<?php esc_html_e( 'Add a lone link to the other language anywhere in PHP (theme, Oxygen code block, Advanced Scripts) — e.g. an "EN" link while browsing in French:', 'duolangue' ); ?>
				</p>
				<pre class="duolangue-code"><code>&lt;?php duolangue_other_lang_link( array( 'display' =&gt; 'code' ) ); ?&gt;</code></pre>
				<p class="description">
					<?php esc_html_e( 'Or get just the URL and build your own markup:', 'duolangue' ); ?>
				</p>
				<pre class="duolangue-code"><code>&lt;a href="&lt;?php echo esc_url( duolangue_other_lang_url() ); ?&gt;"&gt;EN&lt;/a&gt;</code></pre>
				<p class="description">
					<?php esc_html_e( 'Shortcode equivalent, usable in any editor or builder:', 'duolangue' ); ?>
					<code>[duolangue_switcher only_other="yes" display="code"]</code>
				</p>
			</div>

			<p class="submit">
				<button type="submit" class="button button-primary"><?php esc_html_e( 'Save changes', 'duolangue' ); ?></button>
			</p>
		</form>
		<?php
	}

	public function handle_save() {
		check_admin_referer( 'duolangue_save_settings' );
		if ( ! current_user_can( 'manage_options' ) ) {
			wp_die( esc_html__( 'You are not allowed to do that.', 'duolangue' ) );
		}

		$settings = self::get();
		$locales  = self::locales();

		// Language pair: rows 0 and 1 of the form. Every field is read as a
		// string, sanitized, then validated; anything else keeps the
		// current value.
		$raw_langs   = isset( $_POST['languages'] ) && is_array( $_POST['languages'] ) ? map_deep( wp_unslash( $_POST['languages'] ), 'sanitize_text_field' ) : array();
		$default_raw = isset( $_POST['default_lang'] ) ? sanitize_text_field( wp_unslash( $_POST['default_lang'] ) ) : '0';
		$default_idx = '1' === $default_raw ? 1 : 0;

		$languages = array();
		foreach ( array( 0, 1 ) as $i ) {
			$current = $settings['languages'][ $i ];
			$raw     = isset( $raw_langs[ $i ] ) && is_array( $raw_langs[ $i ] ) ? $raw_langs[ $i ] : array();

			$code = isset( $raw['code'] ) && is_string( $raw['code'] ) ? sanitize_key( $raw['code'] ) : '';
			if ( ! preg_match( '/^[a-z][a-z\-]{1,4}$/', $code ) ) {
				$code = $current['code'];
			}

			$name = isset( $raw['name'] ) && is_string( $raw['name'] ) ? sanitize_text_field( $raw['name'] ) : '';
			if ( '' === $name ) {
				$name = $current['name'];
			}

			$locale = isset( $raw['locale'] ) && is_string( $raw['locale'] ) ? sanitize_text_field( $raw['locale'] ) : '';
			if ( ! isset( $locales[ $locale ] ) ) {
				$locale = $current['locale'];
			}

			$languages[] = array(
				'code'    => $code,
				'name'    => $name,
				'locale'  => $locale,
				'default' => $i === $default_idx,
			);
		}
		// The two codes must differ (they become URL prefixes).
		if ( $languages[0]['code'] === $languages[1]['code'] ) {
			$languages[1]['code'] = substr( $languages[1]['code'], 0, 4 ) . '2';
		}
		$settings['languages'] = $languages;

		$settings['url_mode']            = ( isset( $_POST['url_mode'] ) && 'param' === $_POST['url_mode'] ) ? 'param' : 'directory';
		$settings['admin_lang']          = ( isset( $_POST['admin_lang'] ) && 'fr' === $_POST['admin_lang'] ) ? 'fr' : 'en';
		$settings['admin_lang_per_user'] = ! empty( $_POST['admin_lang_per_user'] );

		$settings['switcher_display'] = ( isset( $_POST['switcher_display'] ) && 'code' === $_POST['switcher_display'] ) ? 'code' : 'name';
		$settings['menu_display']     = ( isset( $_POST['menu_display'] ) && 'name' === $_POST['menu_display'] ) ? 'name' : 'code';
		$settings['menu_show']        = ( isset( $_POST['menu_show'] ) && 'both' === $_POST['menu_show'] ) ? 'both' : 'other';

		$raw_locations = isset( $_POST['menu_locations'] ) && is_array( $_POST['menu_locations'] ) ? map_deep( wp_unslash( $_POST['menu_locations'] ), 'sanitize_text_field' ) : array();
		$raw_locations = array_map( 'sanitize_key', array_filter( $raw_locations, 'is_string' ) );
		$valid         = array_merge( array( '_all' ), array_keys( get_registered_nav_menus() ) );
		$settings['menu_locations'] = array_values( array_intersect( $raw_locations, $valid ) );

		self::update( $settings );
		flush_rewrite_rules();

		wp_safe_redirect( admin_url( 'admin.php?page=' . self::PAGE . '&tab=settings&duolangue_msg=settings_saved' ) );
		exit;
	}

	/* ------------------------------------------------------------------
	 * Tab 4 — Pages & editor (overview)
	 * ---------------------------------------------------------------- */

	private static function render_pages_overview() {
		$langs   = duolangue_get_languages();
		$default = duolangue_default_lang();
		?>
		<div class="card duolangue-card">
			<h2><?php esc_html_e( 'Where translation happens', 'duolangue' ); ?></h2>
			<p>
				<?php esc_html_e( 'Duolangue adds a Language column and filter to the native list screens of every public post type, and a "Duolangue — Language" panel in the block editor sidebar. Open any page or post to set its language and link it to its translation.', 'duolangue' ); ?>
			</p>
			<?php
			/** Fires after the introduction of the "Pages & editor" tab. */
			do_action( 'duolangue_pages_overview_after_intro' );
			?>
			<table class="widefat striped">
				<thead>
					<tr>
						<th><?php esc_html_e( 'Post type', 'duolangue' ); ?></th>
						<?php foreach ( $langs as $lang ) : ?>
							<th><?php echo esc_html( strtoupper( $lang['code'] ) ); ?></th>
						<?php endforeach; ?>
						<th></th>
					</tr>
				</thead>
				<tbody>
				<?php foreach ( duolangue_post_types() as $post_type ) :
					$obj = get_post_type_object( $post_type );
					if ( ! $obj ) {
						continue;
					}
					?>
					<tr>
						<td><strong><?php echo esc_html( $obj->labels->name ); ?></strong></td>
						<?php foreach ( $langs as $lang ) : ?>
							<td><?php echo (int) self::count_posts_in_lang( $post_type, $lang['code'], $lang['code'] === $default['code'] ); ?></td>
						<?php endforeach; ?>
						<td>
							<a href="<?php echo esc_url( admin_url( 'edit.php?post_type=' . $post_type ) ); ?>">
								<?php esc_html_e( 'Open list →', 'duolangue' ); ?>
							</a>
						</td>
					</tr>
				<?php endforeach; ?>
				</tbody>
			</table>
		</div>
		<?php
	}

	public static function count_posts_in_lang( $post_type, $lang, $is_default ) {
		$meta_query = $is_default
			? array(
				'relation' => 'OR',
				array( 'key' => '_duolangue_lang', 'value' => $lang ),
				array( 'key' => '_duolangue_lang', 'compare' => 'NOT EXISTS' ),
			)
			: array( array( 'key' => '_duolangue_lang', 'value' => $lang ) );

		$q = new WP_Query( array(
			'post_type'              => $post_type,
			'post_status'            => 'any',
			'posts_per_page'         => 1,
			'fields'                 => 'ids',
			'meta_query'             => $meta_query, // phpcs:ignore WordPress.DB.SlowDBQuery
			'no_found_rows'          => false,
			'update_post_meta_cache' => false,
			'update_post_term_cache' => false,
			'duolangue_lang'           => 'all',
		) );
		return (int) $q->found_posts;
	}
}