<?php
/**
 * Detects AI chatbot plugins and embedded chat widgets.
 *
 * @package AI_Disclosure_For_Chatbots
 */

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

/**
 * Detection of known AI chat surfaces, server-side (plugins) and
 * client-side (embedded SaaS widgets, matched by the front-end script).
 */
class ADFC_Detector {

	/**
	 * Known chatbot WordPress plugins (server-side detection).
	 *
	 * Each entry: id => [label, detector callable returning bool, selector].
	 *
	 * @return array
	 */
	public function known_plugins() {
		return array(
			'ai-engine'   => array(
				'label'    => 'AI Engine',
				'active'   => class_exists( 'Meow_MWAI_Core' ) || defined( 'MWAI_VERSION' ),
				'selector' => '.mwai-chatbot, .mwai-chatbot-container',
			),
			'mxchat'      => array(
				'label'    => 'MxChat',
				'active'   => defined( 'MXCHAT_VERSION' ) || function_exists( 'mxchat_activate' ) || class_exists( 'MxChat_Admin' ),
				'selector' => '#mxchat-chatbot, .mxchat-chatbot-wrapper',
			),
			'chatbot-kognetiks' => array(
				'label'    => 'Kognetiks Chatbot',
				'active'   => function_exists( 'chatbot_chatgpt_activate' ) || defined( 'CHATBOT_CHATGPT_VERSION' ),
				'selector' => '#chatbot-chatgpt, .chatbot-container',
			),
		);
	}

	/**
	 * Known embedded SaaS chat widgets (client-side detection config).
	 *
	 * The front-end script watches for these selectors appearing in the DOM
	 * (most widgets inject asynchronously) and attaches the disclosure badge.
	 *
	 * @return array
	 */
	public function known_embeds() {
		$embeds = array(
			'tidio'     => array(
				'label'    => 'Tidio',
				'selector' => '#tidio-chat, tidio-chat',
			),
			'chatbase'  => array(
				'label'    => 'Chatbase',
				'selector' => '#chatbase-bubble-button, iframe[src*="chatbase.co"]',
			),
			'intercom'  => array(
				'label'    => 'Intercom',
				'selector' => '.intercom-lightweight-app, #intercom-container',
			),
			'crisp'     => array(
				'label'    => 'Crisp',
				'selector' => '#crisp-chatbox',
			),
			'hubspot'   => array(
				'label'    => 'HubSpot Chat',
				'selector' => '#hubspot-messages-iframe-container',
			),
			'tawkto'    => array(
				'label'    => 'Tawk.to',
				'selector' => 'iframe[title="chat widget"], #tawkchat-container',
			),
			'livechat'  => array(
				'label'    => 'LiveChat',
				'selector' => '#chat-widget-container',
			),
			'botpress'  => array(
				'label'    => 'Botpress',
				'selector' => '#bp-web-widget, .bpw-widget-btn',
			),
			'voiceflow' => array(
				'label'    => 'Voiceflow',
				'selector' => '#voiceflow-chat, iframe[src*="voiceflow.com"]',
			),
		);

		/**
		 * Filter the list of known embedded chat widgets.
		 *
		 * @param array $embeds Widget config keyed by id.
		 */
		return apply_filters( 'adfc_known_embeds', $embeds );
	}

	/**
	 * Detected active chatbot plugins.
	 *
	 * @return array id => label
	 */
	public function active_chatbot_plugins() {
		$found = array();
		foreach ( $this->known_plugins() as $id => $config ) {
			if ( ! empty( $config['active'] ) ) {
				$found[ $id ] = $config['label'];
			}
		}
		return $found;
	}

	/**
	 * CSS selectors the front-end script should watch, based on settings.
	 *
	 * @param ADFC_Plugin $plugin Plugin instance for settings access.
	 * @return array list of [id, label, selector]
	 */
	public function frontend_watch_list( $plugin ) {
		$watch = array();

		foreach ( $this->known_plugins() as $id => $config ) {
			if ( ! empty( $config['active'] ) ) {
				$watch[] = array(
					'id'       => $id,
					'label'    => $config['label'],
					'selector' => $config['selector'],
				);
			}
		}

		if ( $plugin->get_setting( 'auto_detect_embeds' ) ) {
			foreach ( $this->known_embeds() as $id => $config ) {
				$watch[] = array(
					'id'       => $id,
					'label'    => $config['label'],
					'selector' => $config['selector'],
				);
			}
		}

		$custom = trim( (string) $plugin->get_setting( 'custom_selectors' ) );
		if ( '' !== $custom ) {
			$lines = preg_split( '/[\r\n,]+/', $custom );
			foreach ( $lines as $i => $line ) {
				$line = trim( $line );
				if ( '' !== $line ) {
					$watch[] = array(
						'id'       => 'custom-' . $i,
						'label'    => 'Custom',
						'selector' => $line,
					);
				}
			}
		}

		return $watch;
	}
}