<?php
/**
 * AI Content Signals - Admin Settings Page
 *
 * Handles the plugin settings interface in the WordPress admin area.
 *
 * @package AIContentSignals
 * @since   1.0.0
 */

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Add settings page to WordPress admin menu
 */
function ayudawp_acs_add_admin_menu() {
	add_options_page(
		__( 'AI Content Signals', 'ai-content-signals' ),
		__( 'AI Content Signals', 'ai-content-signals' ),
		'manage_options',
		'ai-content-signals',
		'ayudawp_acs_settings_page'
	);
}
add_action( 'admin_menu', 'ayudawp_acs_add_admin_menu' );

/**
 * Register plugin settings
 */
function ayudawp_acs_settings_init() {
	register_setting( 'ayudawp_acs', 'ayudawp_acs_settings', array(
		'sanitize_callback' => 'ayudawp_acs_sanitize_settings',
	) );
}
add_action( 'admin_init', 'ayudawp_acs_settings_init' );

/**
 * Sanitize settings callback
 *
 * Signal values are validated against the closed Content Signals vocabulary
 * ('yes', 'no' or '' for unspecified), so nothing outside it can be stored
 * and later emitted on any output surface.
 *
 * @param array $input Raw form input.
 * @return array Sanitized settings.
 */
function ayudawp_acs_sanitize_settings( $input ) {
	if ( ! is_array( $input ) ) {
		return array();
	}

	// Get current settings to preserve values for fields not in the input.
	$current_settings = get_option( 'ayudawp_acs_settings', array() );

	$sanitized = array(
		'global_search'          => ayudawp_acs_sanitize_signal_value( $input['global_search'] ?? $current_settings['global_search'] ?? 'yes' ),
		'global_ai_input'        => ayudawp_acs_sanitize_signal_value( $input['global_ai_input'] ?? $current_settings['global_ai_input'] ?? 'yes' ),
		'global_ai_train'        => ayudawp_acs_sanitize_signal_value( $input['global_ai_train'] ?? $current_settings['global_ai_train'] ?? 'yes' ),
		'include_legal_text'     => ( isset( $input['include_legal_text'] ) && 'yes' === $input['include_legal_text'] ) ? 'yes' : 'no',
		'create_physical_robots' => ayudawp_acs_sanitize_physical_robots_toggle( $input, $current_settings ),
		'emit_meta_tags'         => ( isset( $input['emit_meta_tags'] ) && 'yes' === $input['emit_meta_tags'] ) ? 'yes' : 'no',
		'emit_http_headers'      => ( isset( $input['emit_http_headers'] ) && 'yes' === $input['emit_http_headers'] ) ? 'yes' : 'no',
		'emit_tdmrep'            => ( isset( $input['emit_tdmrep'] ) && 'yes' === $input['emit_tdmrep'] ) ? 'yes' : 'no',
		'bot_settings'           => array(),
		'custom_bots'            => array(),
	);

	// Sanitize bot settings.
	if ( isset( $input['bot_settings'] ) && is_array( $input['bot_settings'] ) ) {
		foreach ( $input['bot_settings'] as $bot => $bot_data ) {
			$sanitized['bot_settings'][ sanitize_text_field( $bot ) ] = array(
				'search'   => ayudawp_acs_sanitize_signal_value( $bot_data['search'] ?? '' ),
				'ai_input' => ayudawp_acs_sanitize_signal_value( $bot_data['ai_input'] ?? '' ),
				'ai_train' => ayudawp_acs_sanitize_signal_value( $bot_data['ai_train'] ?? '' ),
			);
		}
	}

	// Sanitize custom bots.
	if ( isset( $input['custom_bots'] ) && is_array( $input['custom_bots'] ) ) {
		foreach ( $input['custom_bots'] as $bot ) {
			if ( ! empty( $bot['name'] ) ) {
				$sanitized['custom_bots'][] = array(
					'name'     => sanitize_text_field( $bot['name'] ),
					'search'   => ayudawp_acs_sanitize_signal_value( $bot['search'] ?? '' ),
					'ai_input' => ayudawp_acs_sanitize_signal_value( $bot['ai_input'] ?? '' ),
					'ai_train' => ayudawp_acs_sanitize_signal_value( $bot['ai_train'] ?? '' ),
				);
			}
		}
	}

	return $sanitized;
}

/**
 * Resolve the create_physical_robots setting.
 *
 * The checkbox is not rendered where the physical file is a network decision,
 * and an unchecked box is indistinguishable from an absent one in a POST. So on
 * those sites the stored value is carried over instead of being read as 'no',
 * which would silently flip a network administrator's choice every time a
 * subsite administrator saved anything else on the page.
 *
 * @since 1.3.3
 *
 * @param array $input            Raw form input.
 * @param array $current_settings Settings currently stored.
 * @return string 'yes' or 'no'.
 */
function ayudawp_acs_sanitize_physical_robots_toggle( $input, $current_settings ) {
	if ( ayudawp_acs_physical_robots_is_network_only() ) {
		return ( ( $current_settings['create_physical_robots'] ?? 'no' ) === 'yes' ) ? 'yes' : 'no';
	}

	return ( isset( $input['create_physical_robots'] ) && 'yes' === $input['create_physical_robots'] ) ? 'yes' : 'no';
}

/**
 * Enqueue admin styles and scripts
 *
 * @param string $hook Current admin page hook.
 */
function ayudawp_acs_admin_assets( $hook ) {
	if ( 'settings_page_ai-content-signals' !== $hook ) {
		return;
	}

	// Load Thickbox for the "Get VigIA" plugin install modal in the sibling notice.
	add_thickbox();

	// Enqueue CSS.
	wp_enqueue_style(
		'ayudawp-acs-admin',
		AYUDAWP_ACS_PLUGIN_URL . 'assets/admin.css',
		array(),
		AYUDAWP_ACS_VERSION
	);

	// Enqueue JavaScript.
	wp_enqueue_script(
		'ayudawp-acs-admin',
		AYUDAWP_ACS_PLUGIN_URL . 'assets/admin.js',
		array( 'jquery' ),
		AYUDAWP_ACS_VERSION,
		true
	);

	// Pass translations to JavaScript.
	wp_localize_script(
		'ayudawp-acs-admin',
		'ayudawpAcsL10n',
		array(
			'botUserAgentPlaceholder' => __( 'Bot User-Agent (e.g., NewAIBot)', 'ai-content-signals' ),
			'searchGlobal'            => __( 'Search: Global', 'ai-content-signals' ),
			'searchYes'               => __( 'Search: Yes', 'ai-content-signals' ),
			'searchNo'                => __( 'Search: No', 'ai-content-signals' ),
			'aiInputGlobal'           => __( 'AI Input: Global', 'ai-content-signals' ),
			'aiInputYes'              => __( 'AI Input: Yes', 'ai-content-signals' ),
			'aiInputNo'               => __( 'AI Input: No', 'ai-content-signals' ),
			'aiTrainGlobal'           => __( 'AI Train: Global', 'ai-content-signals' ),
			'aiTrainYes'              => __( 'AI Train: Yes', 'ai-content-signals' ),
			'aiTrainNo'               => __( 'AI Train: No', 'ai-content-signals' ),
			'remove'                  => __( 'Remove', 'ai-content-signals' ),
			'confirmRestore'          => __( 'Are you sure you want to restore all settings to their default values? This cannot be undone.', 'ai-content-signals' ),
		)
	);
}
add_action( 'admin_enqueue_scripts', 'ayudawp_acs_admin_assets' );

/**
 * Get predefined list of common AI bots
 *
 * @return array Associative array of bot_key => bot_label.
 */
function ayudawp_acs_get_predefined_bots() {
	$bots = array(
		'GPTBot'           => 'OpenAI GPTBot',
		'OAI-SearchBot'    => 'OpenAI Search Bot',
		'ChatGPT-User'     => 'ChatGPT User Agent',
		'ClaudeBot'        => 'Anthropic ClaudeBot',
		'Claude-Web'       => 'Claude Web Crawler',
		'anthropic-ai'     => 'Anthropic AI',
		'PerplexityBot'    => 'Perplexity Bot',
		'Perplexity-User'  => 'Perplexity User Agent',
		'Google-Extended'  => 'Google Extended (Gemini)',
		'GoogleOther'      => 'Google Other Bots',
		'CCBot'            => 'Common Crawl Bot',
		'cohere-ai'        => 'Cohere AI',
		'Bytespider'       => 'ByteDance (TikTok)',
		'Amazonbot'        => 'Amazon Bot',
		'Applebot-Extended' => 'Apple Extended',
		'meta-externalagent' => 'Meta External Agent',
		'FacebookBot'      => 'Meta/Facebook Bot',
		'DuckAssistBot'    => 'DuckDuckGo AI',
		'AI2Bot'           => 'Allen Institute AI2',
		'MistralAI-User'   => 'Mistral AI',
		'Diffbot'          => 'Diffbot',
		'ImagesiftBot'     => 'ImagesiftBot',
		'Omgilibot'        => 'Omgili Bot',
		'YouBot'           => 'You.com Bot',
		'Timpibot'         => 'Timpi Bot',
		'DeepSeekBot'      => 'DeepSeek AI',
		'GrokBot'          => 'xAI Grok',
		'PanguBot'         => 'Huawei Pangu',
	);

	/**
	 * Filter the predefined bots list.
	 *
	 * Allows other plugins or themes to add or remove bots
	 * from the predefined list without modifying plugin code.
	 *
	 * @since 1.2.0
	 *
	 * @param array $bots Associative array of bot_key => bot_label.
	 */
	return apply_filters( 'ayudawp_acs_predefined_bots', $bots );
}

/**
 * Check if file system is accessible
 *
 * @return bool True if WP_Filesystem is available.
 */
function ayudawp_acs_check_filesystem() {
	global $wp_filesystem;

	if ( empty( $wp_filesystem ) ) {
		require_once ABSPATH . 'wp-admin/includes/file.php';
		WP_Filesystem();
	}

	return ! empty( $wp_filesystem );
}

/**
 * Display admin notices about robots.txt status
 */
function ayudawp_acs_admin_notices() {
	$screen = get_current_screen();
	if ( ! $screen || 'settings_page_ai-content-signals' !== $screen->id ) {
		return;
	}

	if ( ! current_user_can( 'manage_options' ) ) {
		return;
	}

	if ( ! ayudawp_acs_check_filesystem() ) {
		return;
	}

	global $wp_filesystem;
	$robots_file  = ABSPATH . 'robots.txt';
	$has_physical = $wp_filesystem->exists( $robots_file );
	$robots_url   = $has_physical ? home_url( '/robots.txt' ) : home_url( '/?robots=1' );

	// On a network the physical file is one directory shared by every site, so
	// only a network administrator writes it. Everything the standard notices
	// below say about permissions and creation would be false here, so this
	// site gets its own message: what it can do, what it cannot, and why.
	if ( ayudawp_acs_physical_robots_is_network_only() ) {
		if ( $has_physical ) {
			echo '<div class="notice notice-warning"><p>';
			echo '<strong>' . esc_html__( 'Physical robots.txt is managed by the network:', 'ai-content-signals' ) . '</strong> ';
			esc_html_e( 'A physical robots.txt file exists at the root of the network and is shared by every site on it, so only a network administrator can change it. While that file exists it is what this site serves, so Content Signals cannot be added to robots.txt from here.', 'ai-content-signals' );
			echo '<br>';
			esc_html_e( 'The HTML meta tag, HTTP header and TDMRep surfaces below are per site and work normally. To change robots.txt, ask your network administrator.', 'ai-content-signals' );
			echo ' <a href="' . esc_url( $robots_url ) . '" target="_blank">' . esc_html__( 'View robots.txt', 'ai-content-signals' ) . ' &nearr;</a>';
			echo '</p></div>';
		} else {
			echo '<div class="notice notice-info"><p>';
			echo '<strong>' . esc_html__( 'Virtual robots.txt mode:', 'ai-content-signals' ) . '</strong> ';
			esc_html_e( 'No physical robots.txt detected, so Content Signals are added to this site own virtual robots.txt and work normally.', 'ai-content-signals' );
			echo '<br>';
			esc_html_e( 'Creating a physical file is not offered here: it would sit at the root of the network and be shared by every site on it, so only a network administrator can create it.', 'ai-content-signals' );
			echo ' <a href="' . esc_url( $robots_url ) . '" target="_blank">' . esc_html__( 'View virtual robots.txt', 'ai-content-signals' ) . ' &nearr;</a>';
			echo '</p></div>';
		}

		return;
	}

	if ( $has_physical ) {
		$is_readable = $wp_filesystem->is_readable( $robots_file );
		$is_writable = $wp_filesystem->is_writable( $robots_file );

		if ( $is_readable && $is_writable ) {
			echo '<div class="notice notice-success"><p>';
			echo '<strong>' . esc_html__( 'Physical robots.txt detected:', 'ai-content-signals' ) . '</strong> ';
			esc_html_e( 'File is readable and writable. Content Signals will be appended to your existing robots.txt file.', 'ai-content-signals' );
			echo ' ';
			esc_html_e( 'If you uninstall the plugin, the file will remain but Content Signals lines will be automatically removed.', 'ai-content-signals' );
			echo ' <a href="' . esc_url( $robots_url ) . '" target="_blank">' . esc_html__( 'View robots.txt', 'ai-content-signals' ) . ' &nearr;</a>';
			echo '</p></div>';
		} else {
			echo '<div class="notice notice-error"><p>';
			echo '<strong>' . esc_html__( 'Warning - Cannot write to robots.txt!', 'ai-content-signals' ) . '</strong><br>';

			if ( ! $is_readable && ! $is_writable ) {
				esc_html_e( 'Physical robots.txt exists but is NOT readable or writable. Content Signals cannot be applied to the file.', 'ai-content-signals' );
				echo '<br>';
				esc_html_e( 'Please change file permissions to 644 before configuring settings.', 'ai-content-signals' );
			} elseif ( ! $is_readable ) {
				esc_html_e( 'Physical robots.txt exists but is NOT readable. Content Signals cannot read the file.', 'ai-content-signals' );
				echo '<br>';
				esc_html_e( 'Please change file permissions to 644 before configuring settings.', 'ai-content-signals' );
			} else {
				esc_html_e( 'Physical robots.txt exists but is NOT writable. Content Signals cannot be written to the file.', 'ai-content-signals' );
				echo '<br>';
				esc_html_e( 'Please change file permissions to 644 before configuring settings.', 'ai-content-signals' );
			}

			echo ' <a href="' . esc_url( $robots_url ) . '" target="_blank">' . esc_html__( 'View robots.txt', 'ai-content-signals' ) . ' &nearr;</a>';
			echo '</p></div>';
		}
	} else {
		$settings       = get_option( 'ayudawp_acs_settings', array() );
		$create_enabled = ( $settings['create_physical_robots'] ?? 'no' ) === 'yes';

		if ( $create_enabled && $wp_filesystem->is_writable( ABSPATH ) ) {
			echo '<div class="notice notice-warning"><p>';
			echo '<strong>' . esc_html__( 'Physical robots.txt will be created:', 'ai-content-signals' ) . '</strong> ';
			esc_html_e( 'You have enabled the option to create a physical robots.txt. It will be created with basic WordPress rules when you save settings.', 'ai-content-signals' );
			echo ' <a href="' . esc_url( $robots_url ) . '" target="_blank">' . esc_html__( 'View current virtual robots.txt', 'ai-content-signals' ) . ' &nearr;</a>';
			echo '</p></div>';
		} elseif ( $create_enabled && ! $wp_filesystem->is_writable( ABSPATH ) ) {
			echo '<div class="notice notice-error"><p>';
			echo '<strong>' . esc_html__( 'Cannot create robots.txt:', 'ai-content-signals' ) . '</strong> ';
			esc_html_e( 'The root directory is not writable. Please check directory permissions or contact your hosting provider.', 'ai-content-signals' );
			echo '</p></div>';
		} else {
			echo '<div class="notice notice-info"><p>';
			echo '<strong>' . esc_html__( 'Virtual robots.txt mode:', 'ai-content-signals' ) . '</strong> ';
			esc_html_e( 'No physical robots.txt detected. Content Signals are being added to the WordPress virtual robots.txt. You can enable the option below to create a physical file with basic rules.', 'ai-content-signals' );
			echo ' <a href="' . esc_url( $robots_url ) . '" target="_blank">' . esc_html__( 'View virtual robots.txt', 'ai-content-signals' ) . ' &nearr;</a>';
			echo '</p></div>';
		}
	}
}
add_action( 'admin_notices', 'ayudawp_acs_admin_notices' );

/**
 * Check whether the VigIA companion plugin is active.
 *
 * @return bool True if VigIA is loaded.
 */
function ayudawp_acs_is_vigia_active() {
	return defined( 'VIGIA_VERSION' );
}

/**
 * Render an informational notice about how AI Content Signals and VigIA complement each other.
 *
 * AI Content Signals declares the AI usage policy; VigIA observes and blocks the
 * crawlers. When VigIA is not installed, a Thickbox install link is offered.
 */
function ayudawp_acs_vigia_notice() {
	if ( ayudawp_acs_is_vigia_active() ) {
		?>
		<div class="notice notice-info inline ayudawp-acs-vigia-notice">
			<p><?php esc_html_e( 'VigIA detected. AI Content Signals declares your AI usage policy; VigIA tracks and blocks the crawlers. They complement each other (ACS writes Content-Signal directives, VigIA manages access), so there is no conflict.', 'ai-content-signals' ); ?></p>
		</div>
		<?php
		return;
	}

	$install_url = admin_url( 'plugin-install.php?tab=plugin-information&plugin=vigia&TB_iframe=true&width=772&height=618' );
	?>
	<div class="notice notice-info inline ayudawp-acs-vigia-notice">
		<p>
			<?php esc_html_e( 'This plugin declares how AI may use your content. To also see which AI crawlers visit your site and block them, pair it with VigIA, its companion observatory.', 'ai-content-signals' ); ?>
			<a href="<?php echo esc_url( $install_url ); ?>" class="thickbox"><?php esc_html_e( 'Get VigIA', 'ai-content-signals' ); ?></a>
		</p>
	</div>
	<?php
}

/**
 * Render settings page
 */
function ayudawp_acs_settings_page() {
	if ( ! current_user_can( 'manage_options' ) ) {
		return;
	}

	$settings        = get_option( 'ayudawp_acs_settings', array() );
	$predefined_bots = ayudawp_acs_get_predefined_bots();

	?>
	<div class="wrap ayudawp-acs-settings">
		<h1><span class="dashicons dashicons-flag ayudawp-acs-title-icon"></span><?php esc_html_e( 'AI Content Signals Settings', 'ai-content-signals' ); ?></h1>
		<p><?php esc_html_e( 'Configure how AI crawlers can use your content by setting Content Signals in your robots.txt file.', 'ai-content-signals' ); ?></p>

		<?php // wp-header-end marks where WordPress relocates admin notices, keeping the description directly under the title. ?>
		<div class="wp-header-end"></div>

		<?php
		// Print anything registered with add_settings_error() for this group.
		// A page added with add_options_page() is not one of the core options-*.php
		// screens, so wp-admin/options-head.php never runs for it and nothing
		// prints these on its own. Covers both the notices raised during this
		// request (import and restore errors) and the ones options.php stored in
		// the settings_errors transient before redirecting.
		settings_errors( 'ayudawp_acs' );
		?>

		<?php ayudawp_acs_vigia_notice(); ?>

		<form method="post" action="options.php">
			<?php settings_fields( 'ayudawp_acs' ); ?>

			<!-- Global Settings -->
			<h2><?php esc_html_e( 'Global default settings', 'ai-content-signals' ); ?></h2>
			<p class="description"><?php esc_html_e( 'Default permissions for all AI bots and crawlers (User-Agent: *). You can override these settings for specific bots below.', 'ai-content-signals' ); ?></p>

			<table class="form-table">
				<tr>
					<th scope="row"><?php esc_html_e( 'Search', 'ai-content-signals' ); ?></th>
					<td>
						<select name="ayudawp_acs_settings[global_search]">
							<option value="yes" <?php selected( $settings['global_search'] ?? 'yes', 'yes' ); ?>><?php esc_html_e( 'Yes - Allow search indexing', 'ai-content-signals' ); ?></option>
							<option value="no" <?php selected( $settings['global_search'] ?? 'yes', 'no' ); ?>><?php esc_html_e( 'No - Block search indexing', 'ai-content-signals' ); ?></option>
							<option value="" <?php selected( $settings['global_search'] ?? 'yes', '' ); ?>><?php esc_html_e( 'Not specified', 'ai-content-signals' ); ?></option>
						</select>
						<p class="description"><?php esc_html_e( 'Building search index and providing search results with links and short excerpts.', 'ai-content-signals' ); ?></p>
					</td>
				</tr>
				<tr>
					<th scope="row"><?php esc_html_e( 'AI Input', 'ai-content-signals' ); ?></th>
					<td>
						<select name="ayudawp_acs_settings[global_ai_input]">
							<option value="yes" <?php selected( $settings['global_ai_input'] ?? 'yes', 'yes' ); ?>><?php esc_html_e( 'Yes - Allow AI input', 'ai-content-signals' ); ?></option>
							<option value="no" <?php selected( $settings['global_ai_input'] ?? 'yes', 'no' ); ?>><?php esc_html_e( 'No - Block AI input', 'ai-content-signals' ); ?></option>
							<option value="" <?php selected( $settings['global_ai_input'] ?? 'yes', '' ); ?>><?php esc_html_e( 'Not specified', 'ai-content-signals' ); ?></option>
						</select>
						<p class="description"><?php esc_html_e( 'Using content for real-time AI responses (RAG, grounding, AI Overviews).', 'ai-content-signals' ); ?></p>
					</td>
				</tr>
				<tr>
					<th scope="row"><?php esc_html_e( 'AI Train', 'ai-content-signals' ); ?></th>
					<td>
						<select name="ayudawp_acs_settings[global_ai_train]">
							<option value="yes" <?php selected( $settings['global_ai_train'] ?? 'yes', 'yes' ); ?>><?php esc_html_e( 'Yes - Allow AI training', 'ai-content-signals' ); ?></option>
							<option value="no" <?php selected( $settings['global_ai_train'] ?? 'yes', 'no' ); ?>><?php esc_html_e( 'No - Block AI training', 'ai-content-signals' ); ?></option>
							<option value="" <?php selected( $settings['global_ai_train'] ?? 'yes', '' ); ?>><?php esc_html_e( 'Not specified', 'ai-content-signals' ); ?></option>
						</select>
						<p class="description"><?php esc_html_e( 'Training or fine-tuning AI models with your content.', 'ai-content-signals' ); ?></p>
					</td>
				</tr>
				<tr>
					<th scope="row"><?php esc_html_e( 'Legal text', 'ai-content-signals' ); ?></th>
					<td>
						<label>
							<input type="checkbox" name="ayudawp_acs_settings[include_legal_text]" value="yes" <?php checked( $settings['include_legal_text'] ?? 'yes', 'yes' ); ?>>
							<?php esc_html_e( 'Include Content Signals Policy legal text and explanations', 'ai-content-signals' ); ?>
						</label>
						<p class="description"><?php esc_html_e( 'Adds the full policy text with EU Directive reference and signal definitions.', 'ai-content-signals' ); ?></p>
					</td>
				</tr>
				<tr>
					<th scope="row"><?php esc_html_e( 'Create physical robots.txt', 'ai-content-signals' ); ?></th>
					<td>
						<?php if ( ayudawp_acs_physical_robots_is_network_only() ) : ?>
							<?php // No checkbox on a subsite: the file belongs to the network, so offering a toggle that cannot act would be a lie. The stored value is preserved on save, see ayudawp_acs_sanitize_physical_robots_toggle(). ?>
							<p class="description"><?php esc_html_e( 'Not available on this site. The file would sit at the root of the network and be shared by every site on it, so only a network administrator can create it.', 'ai-content-signals' ); ?></p>
						<?php else : ?>
						<label>
							<input type="checkbox" name="ayudawp_acs_settings[create_physical_robots]" value="yes" <?php checked( $settings['create_physical_robots'] ?? 'no', 'yes' ); ?>>
							<?php esc_html_e( 'Create physical robots.txt file if it doesn\'t exist', 'ai-content-signals' ); ?>
						</label>
						<p class="description"><?php esc_html_e( 'This will create a basic robots.txt file with WordPress default rules plus Content Signals. Only works if the root directory is writable.', 'ai-content-signals' ); ?></p>
						<?php endif; ?>
					</td>
				</tr>
			</table>

			<!-- Output surfaces -->
			<h2><?php esc_html_e( 'Output surfaces', 'ai-content-signals' ); ?></h2>
			<p class="description"><?php esc_html_e( 'Besides robots.txt, you can express the same AI usage preferences on other surfaces. These emit opt-out directives (noai, noimageai) derived from your global AI Train setting, and are disabled by default.', 'ai-content-signals' ); ?></p>

			<table class="form-table">
				<tr>
					<th scope="row"><?php esc_html_e( 'HTML meta tag', 'ai-content-signals' ); ?></th>
					<td>
						<label>
							<input type="checkbox" name="ayudawp_acs_settings[emit_meta_tags]" value="yes" <?php checked( $settings['emit_meta_tags'] ?? 'no', 'yes' ); ?>>
							<?php esc_html_e( 'Output a robots meta tag with noai, noimageai on the front-end', 'ai-content-signals' ); ?>
						</label>
						<p class="description"><?php esc_html_e( 'Adds a robots meta tag with noai, noimageai in the page head when AI training is blocked. Does not affect index/follow.', 'ai-content-signals' ); ?></p>
					</td>
				</tr>
				<tr>
					<th scope="row"><?php esc_html_e( 'HTTP header', 'ai-content-signals' ); ?></th>
					<td>
						<label>
							<input type="checkbox" name="ayudawp_acs_settings[emit_http_headers]" value="yes" <?php checked( $settings['emit_http_headers'] ?? 'no', 'yes' ); ?>>
							<?php esc_html_e( 'Send an X-Robots-Tag: noai, noimageai response header on the front-end', 'ai-content-signals' ); ?>
						</label>
						<p class="description"><?php esc_html_e( 'Sent only when AI training is blocked, alongside any existing X-Robots-Tag header from other plugins.', 'ai-content-signals' ); ?></p>
					</td>
				</tr>
				<tr>
					<th scope="row"><?php esc_html_e( 'TDMRep file', 'ai-content-signals' ); ?></th>
					<td>
						<label>
							<input type="checkbox" name="ayudawp_acs_settings[emit_tdmrep]" value="yes" <?php checked( $settings['emit_tdmrep'] ?? 'no', 'yes' ); ?>>
							<?php esc_html_e( 'Serve a TDMRep manifest at /.well-known/tdmrep.json', 'ai-content-signals' ); ?>
						</label>
						<p class="description"><?php esc_html_e( 'W3C Text and Data Mining Reservation Protocol. Reserves mining rights (tdm-reservation: 1) when AI training is blocked. Auto-discovered at the well-known path.', 'ai-content-signals' ); ?></p>
					</td>
				</tr>
			</table>

			<!-- Individual Bot Settings -->
			<h2><?php esc_html_e( 'Individual bot settings', 'ai-content-signals' ); ?></h2>
			<p class="description"><?php esc_html_e( 'Configure specific permissions for each AI bot. Select "Use global" to inherit the default settings above.', 'ai-content-signals' ); ?></p>

			<table class="widefat ayudawp-acs-bots-table">
				<thead>
					<tr>
						<th><?php esc_html_e( 'Bot name', 'ai-content-signals' ); ?></th>
						<th><?php esc_html_e( 'Search', 'ai-content-signals' ); ?></th>
						<th><?php esc_html_e( 'AI Input', 'ai-content-signals' ); ?></th>
						<th><?php esc_html_e( 'AI Train', 'ai-content-signals' ); ?></th>
					</tr>
				</thead>
				<tbody>
					<?php
					foreach ( $predefined_bots as $bot_key => $bot_name ) :
						$bot_settings = $settings['bot_settings'][ $bot_key ] ?? array();
						?>
					<tr>
						<td><strong><?php echo esc_html( $bot_name ); ?></strong><br><code><?php echo esc_html( $bot_key ); ?></code></td>
						<td>
							<select name="ayudawp_acs_settings[bot_settings][<?php echo esc_attr( $bot_key ); ?>][search]">
								<option value="" <?php selected( $bot_settings['search'] ?? '', '' ); ?>><?php esc_html_e( 'Use global', 'ai-content-signals' ); ?></option>
								<option value="yes" <?php selected( $bot_settings['search'] ?? '', 'yes' ); ?>><?php esc_html_e( 'Yes', 'ai-content-signals' ); ?></option>
								<option value="no" <?php selected( $bot_settings['search'] ?? '', 'no' ); ?>><?php esc_html_e( 'No', 'ai-content-signals' ); ?></option>
							</select>
						</td>
						<td>
							<select name="ayudawp_acs_settings[bot_settings][<?php echo esc_attr( $bot_key ); ?>][ai_input]">
								<option value="" <?php selected( $bot_settings['ai_input'] ?? '', '' ); ?>><?php esc_html_e( 'Use global', 'ai-content-signals' ); ?></option>
								<option value="yes" <?php selected( $bot_settings['ai_input'] ?? '', 'yes' ); ?>><?php esc_html_e( 'Yes', 'ai-content-signals' ); ?></option>
								<option value="no" <?php selected( $bot_settings['ai_input'] ?? '', 'no' ); ?>><?php esc_html_e( 'No', 'ai-content-signals' ); ?></option>
							</select>
						</td>
						<td>
							<select name="ayudawp_acs_settings[bot_settings][<?php echo esc_attr( $bot_key ); ?>][ai_train]">
								<option value="" <?php selected( $bot_settings['ai_train'] ?? '', '' ); ?>><?php esc_html_e( 'Use global', 'ai-content-signals' ); ?></option>
								<option value="yes" <?php selected( $bot_settings['ai_train'] ?? '', 'yes' ); ?>><?php esc_html_e( 'Yes', 'ai-content-signals' ); ?></option>
								<option value="no" <?php selected( $bot_settings['ai_train'] ?? '', 'no' ); ?>><?php esc_html_e( 'No', 'ai-content-signals' ); ?></option>
							</select>
						</td>
					</tr>
					<?php endforeach; ?>
				</tbody>
			</table>

			<!-- Custom Bots Section -->
			<h3><?php esc_html_e( 'Custom bots', 'ai-content-signals' ); ?></h3>
			<p class="description"><?php esc_html_e( 'Add custom User-Agent strings for bots not in the predefined list.', 'ai-content-signals' ); ?></p>

			<div id="ayudawp-acs-custom-bots">
				<?php
				$custom_bots = $settings['custom_bots'] ?? array();
				if ( ! empty( $custom_bots ) ) :
					foreach ( $custom_bots as $index => $bot ) :
						?>
				<div class="ayudawp-acs-custom-bot-row">
					<input type="text" name="ayudawp_acs_settings[custom_bots][<?php echo esc_attr( $index ); ?>][name]"
						   value="<?php echo esc_attr( $bot['name'] ?? '' ); ?>"
						   placeholder="<?php esc_attr_e( 'Bot User-Agent (e.g., NewAIBot)', 'ai-content-signals' ); ?>">

					<select name="ayudawp_acs_settings[custom_bots][<?php echo esc_attr( $index ); ?>][search]">
						<option value="" <?php selected( $bot['search'] ?? '', '' ); ?>><?php esc_html_e( 'Search: Global', 'ai-content-signals' ); ?></option>
						<option value="yes" <?php selected( $bot['search'] ?? '', 'yes' ); ?>><?php esc_html_e( 'Search: Yes', 'ai-content-signals' ); ?></option>
						<option value="no" <?php selected( $bot['search'] ?? '', 'no' ); ?>><?php esc_html_e( 'Search: No', 'ai-content-signals' ); ?></option>
					</select>

					<select name="ayudawp_acs_settings[custom_bots][<?php echo esc_attr( $index ); ?>][ai_input]">
						<option value="" <?php selected( $bot['ai_input'] ?? '', '' ); ?>><?php esc_html_e( 'AI Input: Global', 'ai-content-signals' ); ?></option>
						<option value="yes" <?php selected( $bot['ai_input'] ?? '', 'yes' ); ?>><?php esc_html_e( 'AI Input: Yes', 'ai-content-signals' ); ?></option>
						<option value="no" <?php selected( $bot['ai_input'] ?? '', 'no' ); ?>><?php esc_html_e( 'AI Input: No', 'ai-content-signals' ); ?></option>
					</select>

					<select name="ayudawp_acs_settings[custom_bots][<?php echo esc_attr( $index ); ?>][ai_train]">
						<option value="" <?php selected( $bot['ai_train'] ?? '', '' ); ?>><?php esc_html_e( 'AI Train: Global', 'ai-content-signals' ); ?></option>
						<option value="yes" <?php selected( $bot['ai_train'] ?? '', 'yes' ); ?>><?php esc_html_e( 'AI Train: Yes', 'ai-content-signals' ); ?></option>
						<option value="no" <?php selected( $bot['ai_train'] ?? '', 'no' ); ?>><?php esc_html_e( 'AI Train: No', 'ai-content-signals' ); ?></option>
					</select>

					<button type="button" class="button ayudawp-acs-remove-bot"><?php esc_html_e( 'Remove', 'ai-content-signals' ); ?></button>
				</div>
						<?php
					endforeach;
				endif;
				?>
			</div>

			<button type="button" id="ayudawp-acs-add-bot" class="button"><?php esc_html_e( 'Add custom bot', 'ai-content-signals' ); ?></button>

			<p class="description ayudawp-acs-custom-bots-notice">
				<strong><?php esc_html_e( 'Important:', 'ai-content-signals' ); ?></strong>
				<?php esc_html_e( 'After adding custom bots, you must save the settings for them to be added to your robots.txt file.', 'ai-content-signals' ); ?>
			</p>

			<?php submit_button(); ?>
		</form>

		<!-- Content Signals Preview Section -->
		<h2><?php esc_html_e( 'Content Signals Preview', 'ai-content-signals' ); ?></h2>
		<p class="description"><?php esc_html_e( 'Preview of the Content Signals code that will be added to your robots.txt file.', 'ai-content-signals' ); ?></p>

		<textarea readonly rows="20" class="large-text code"><?php echo esc_textarea( ayudawp_acs_generate_preview() ); ?></textarea>

		<!-- Backup & Restore Section -->
		<h2><?php esc_html_e( 'Backup & Restore', 'ai-content-signals' ); ?></h2>
		<p class="description"><?php esc_html_e( 'Export your configuration for backup or migration, import a previously exported file, or restore all settings to their default values.', 'ai-content-signals' ); ?></p>

		<div class="ayudawp-acs-export-import">
			<div class="ayudawp-acs-export-box">
				<h3><?php esc_html_e( 'Export', 'ai-content-signals' ); ?></h3>
				<p><?php esc_html_e( 'Download a JSON file with all your current settings, including global configuration, individual bot settings, and custom bots.', 'ai-content-signals' ); ?></p>
				<?php
				$export_url = wp_nonce_url(
					admin_url( 'options-general.php?page=ai-content-signals&ayudawp_acs_export=1' ),
					'ayudawp_acs_export'
				);
				?>
				<a href="<?php echo esc_url( $export_url ); ?>" class="button button-primary"><?php esc_html_e( 'Export settings', 'ai-content-signals' ); ?></a>
			</div>

			<div class="ayudawp-acs-import-box">
				<h3><?php esc_html_e( 'Import', 'ai-content-signals' ); ?></h3>
				<p><?php esc_html_e( 'Upload a previously exported JSON file to restore settings. This will overwrite your current configuration.', 'ai-content-signals' ); ?></p>
				<form method="post" enctype="multipart/form-data">
					<?php wp_nonce_field( 'ayudawp_acs_import' ); ?>
					<input type="hidden" name="ayudawp_acs_import" value="1">
					<input type="file" name="ayudawp_acs_import_file" accept=".json">
					<p>
						<button type="submit" class="button"><?php esc_html_e( 'Import settings', 'ai-content-signals' ); ?></button>
					</p>
				</form>
			</div>

			<div class="ayudawp-acs-restore-box">
				<h3><?php esc_html_e( 'Restore defaults', 'ai-content-signals' ); ?></h3>
				<p><?php esc_html_e( 'Reset all settings to their default values. Global signals will be set to "Yes", all bot overrides and custom bots will be removed.', 'ai-content-signals' ); ?></p>
				<form method="post" id="ayudawp-acs-restore-form">
					<?php wp_nonce_field( 'ayudawp_acs_restore_defaults' ); ?>
					<input type="hidden" name="ayudawp_acs_restore_defaults" value="1">
					<button type="submit" class="button ayudawp-acs-restore-btn"><?php esc_html_e( 'Restore defaults', 'ai-content-signals' ); ?></button>
				</form>
			</div>
		</div>

		<?php
		// Dynamic promotional banner with random service rotation.
		$promo_banner = new Ayudawp_Acs_Promo_Banner( 'aics' );
		$promo_banner->render();
		?>
	</div>
	<?php
}

/**
 * Generate preview of robots.txt content
 *
 * @return string Generated Content Signals text.
 */
function ayudawp_acs_generate_preview() {
	return ayudawp_acs_generate_content_signals();
}