<?php
/**
 * Core plugin bootstrap.
 *
 * @package AI_Disclosure_For_Chatbots
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Main plugin class: wires up modules and holds shared option access.
 */
class ADFC_Plugin {

	const OPTION_KEY = 'adfc_settings';

	/**
	 * Singleton instance.
	 *
	 * @var ADFC_Plugin|null
	 */
	private static $instance = null;

	/**
	 * Settings module.
	 *
	 * @var ADFC_Settings
	 */
	public $settings;

	/**
	 * Detector module.
	 *
	 * @var ADFC_Detector
	 */
	public $detector;

	/**
	 * Chatbot disclosure module.
	 *
	 * @var ADFC_Chatbot_Disclosure
	 */
	public $chatbot;

	/**
	 * Media labels module.
	 *
	 * @var ADFC_Media_Labels
	 */
	public $media;

	/**
	 * Get (and lazily create) the shared instance.
	 *
	 * @return ADFC_Plugin
	 */
	public static function instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Constructor: instantiate modules.
	 */
	private function __construct() {
		$this->detector = new ADFC_Detector();
		$this->settings = new ADFC_Settings( $this );
		$this->chatbot  = new ADFC_Chatbot_Disclosure( $this );
		$this->media    = new ADFC_Media_Labels( $this );

		// Translations load automatically for wordpress.org-hosted plugins
		// via language packs since WP 4.6; no manual loading needed.
	}

	/**
	 * Default settings.
	 *
	 * @return array
	 */
	public static function defaults() {
		return array(
			'chatbot_disclosure_enabled' => 1,
			'chatbot_badge_text'         => '', // Empty = locale-appropriate default.
			'chatbot_badge_position'     => 'top',
			'auto_detect_embeds'         => 1,
			'custom_selectors'           => '',
			'media_labels_enabled'       => 1,
			'media_auto_detect'          => 1,
			'media_badge_text'           => '',
			'media_badge_style'          => 'corner',
			'media_machine_readable'     => 1,
		);
	}

	/**
	 * Get a setting value with fallback to defaults.
	 *
	 * @param string $key Setting key.
	 * @return mixed
	 */
	public function get_setting( $key ) {
		$options  = get_option( self::OPTION_KEY, array() );
		$defaults = self::defaults();
		if ( isset( $options[ $key ] ) ) {
			return $options[ $key ];
		}
		return isset( $defaults[ $key ] ) ? $defaults[ $key ] : null;
	}

	/**
	 * Locale-appropriate default disclosure text for chatbots.
	 *
	 * Wording follows the plain-language approach of the European
	 * Commission's July 2026 Article 50 guidance: clear, at first
	 * interaction, not buried in terms.
	 *
	 * @return string
	 */
	public function default_chatbot_text() {
		/* translators: Shown to site visitors near a chatbot window. */
		return __( 'You are interacting with an AI chatbot, not a human.', 'ai-disclosure-for-chatbots' );
	}

	/**
	 * Locale-appropriate default label text for AI media.
	 *
	 * @return string
	 */
	public function default_media_text() {
		/* translators: Short badge label shown over AI-generated images. */
		return __( 'AI-generated', 'ai-disclosure-for-chatbots' );
	}

	/**
	 * Activation hook: seed defaults without overwriting existing settings.
	 *
	 * @return void
	 */
	public static function activate() {
		$existing = get_option( self::OPTION_KEY, false );
		if ( false === $existing ) {
			add_option( self::OPTION_KEY, self::defaults() );
		}
	}
}