<?php
/**
 * Plugin Name: Agentivo Chatbots
 * Plugin URI: https://agentivo.ai/
 * Description: Integrate Agentivo chatbot widgets (bubble and inline) into your WordPress site.
 * Version: 1.1.2
 * Author: iseremo GmbH
 * Author URI: https://iseremo.com/
 * License: GPLv2 or later
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain: agentivo-chatbots
 * Domain Path: /languages
 * Requires at least: 6.3
 * Requires PHP: 7.4
 */

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

// Plugin constants
define( 'AGENTIVO_CHATBOTS_VERSION', '1.1.2' );
define( 'AGENTIVO_CHATBOTS_PLUGIN_FILE', __FILE__ );
define( 'AGENTIVO_CHATBOTS_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
define( 'AGENTIVO_CHATBOTS_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
define( 'AGENTIVO_CHATBOTS_PLUGIN_BASENAME', plugin_basename( __FILE__ ) );
define( 'AGENTIVO_CHATBOTS_WIDGET_BASE_URL', 'https://app.agentivo.ai/chat-widget-v1/' );

/**
 * Main Plugin Class
 */
class Agentivo_Chatbots {
	private static ?Agentivo_Chatbots $instance = null;

	public static function get_instance(): Agentivo_Chatbots {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	private function __construct() {
		$this->init_hooks();
	}

	private function init_hooks(): void {
		// Settings & Admin
		add_action( 'admin_init', [ $this, 'register_settings' ] );
		add_action( 'admin_menu', [ $this, 'add_admin_menu' ] );
		add_action( 'admin_enqueue_scripts', [ $this, 'enqueue_admin_assets' ] );

		// Frontend
		add_action( 'wp_footer', [ $this, 'inject_bubble_chat_script' ] );
		add_shortcode( 'agentivo_chat', [ $this, 'render_shortcode' ] );

		// Blocks
		add_action( 'init', [ $this, 'register_blocks' ] );

		// Activation
		register_activation_hook( __FILE__, [ $this, 'activate' ] );
	}

	/**
	 * Helpers
	 */
	public static function get_asset_url( string $path ): string {
		return AGENTIVO_CHATBOTS_PLUGIN_URL . 'assets/' . ltrim( $path, '/' );
	}

	public static function get_widget_url( string $chat_id ): string {
		return AGENTIVO_CHATBOTS_WIDGET_BASE_URL . sanitize_text_field( $chat_id ) . '.js';
	}

	/**
	 * Settings
	 */
	public function register_settings(): void {
		$options = [
			'agentivo_chatbots_bubble_chat_id' => [ $this, 'sanitize_chat_id' ],
			'agentivo_chatbots_inline_chat_id' => [ $this, 'sanitize_chat_id' ],
			'agentivo_chatbots_inline_width'    => 'sanitize_text_field',
			'agentivo_chatbots_inline_height'   => 'sanitize_text_field',
		];

		foreach ( $options as $option => $callback ) {
			register_setting( 'agentivo_chatbots_settings', $option, [
				'type'              => 'string',
				'sanitize_callback' => $callback,
				'default'           => $option === 'agentivo_chatbots_inline_width' ? '100%' : ($option === 'agentivo_chatbots_inline_height' ? '600px' : ''),
				'show_in_rest'      => true,
			] );
		}
	}

	public function sanitize_chat_id( string $value ): string {
		return preg_replace( '/[^a-zA-Z0-9\-]/', '', sanitize_text_field( $value ) );
	}

	/**
	 * Admin UI
	 */
	public function add_admin_menu(): void {
		add_menu_page(
			__( 'Agentivo Chatbots', 'agentivo-chatbots' ),
			__( 'Agentivo', 'agentivo-chatbots' ),
			'manage_options',
			'agentivo-chatbots',
			[ $this, 'render_admin_page' ],
			'dashicons-format-chat',
			80
		);
	}

	public function enqueue_admin_assets( string $hook ): void {
		if ( 'toplevel_page_agentivo-chatbots' !== $hook ) return;

		wp_enqueue_style( 'agentivo-chatbots-admin', self::get_asset_url( 'css/admin.css' ), [], AGENTIVO_CHATBOTS_VERSION );
		wp_enqueue_script( 'agentivo-chatbots-admin', self::get_asset_url( 'js/admin.js' ), [], AGENTIVO_CHATBOTS_VERSION, true );
		wp_localize_script( 'agentivo-chatbots-admin', 'agentivoChatbots', [
			'copySuccess' => __( 'Shortcode copied to clipboard!', 'agentivo-chatbots' ),
			'copyError'   => __( 'Failed to copy. Please select and copy manually.', 'agentivo-chatbots' ),
		] );
	}

	public function render_admin_page(): void {
		if ( ! current_user_can( 'manage_options' ) ) return;
		
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- settings-updated is added by WordPress core after successful save.
		if ( isset( $_GET['settings-updated'] ) && 'true' === $_GET['settings-updated'] ) {
			add_settings_error( 'agentivo_chatbots_messages', 'agentivo_chatbots_message', __( 'Settings saved successfully.', 'agentivo-chatbots' ), 'success' );
		}
		settings_errors( 'agentivo_chatbots_messages' );
		include AGENTIVO_CHATBOTS_PLUGIN_DIR . 'assets/templates/admin-page.php';
	}

	/**
	 * Frontend & Shortcode
	 */
	public function inject_bubble_chat_script(): void {
		$id = get_option( 'agentivo_chatbots_bubble_chat_id', '' );
		if ( empty( $id ) ) return;

		wp_enqueue_script( 'agentivo-bubble-chat-' . md5( $id ), self::get_widget_url( $id ), [], AGENTIVO_CHATBOTS_VERSION, [ 'strategy' => 'async', 'in_footer' => true ] );
	}

	public function render_shortcode( array $atts ): string {
		$atts = shortcode_atts( [
			'id'     => get_option( 'agentivo_chatbots_inline_chat_id', '' ),
			'width'  => get_option( 'agentivo_chatbots_inline_width', '100%' ),
			'height' => get_option( 'agentivo_chatbots_inline_height', '600px' ),
		], $atts, 'agentivo_chat' );

		if ( empty( $atts['id'] ) ) return '<p>' . esc_html__( 'Please configure the inline chat ID.', 'agentivo-chatbots' ) . '</p>';

		wp_enqueue_script( 'agentivo-inline-chat-' . md5( $atts['id'] ), self::get_widget_url( $atts['id'] ), [], AGENTIVO_CHATBOTS_VERSION, [ 'strategy' => 'async', 'in_footer' => true ] );

		return sprintf( '<div id="agentivo-inline-widget" class="agentivo-inline-widget" style="width: %s; height: %s;"></div>', esc_attr( $atts['width'] ), esc_attr( $atts['height'] ) );
	}

	/**
	 * Blocks
	 */
	public function register_blocks(): void {
		register_block_type( 'agentivo/chat', [
			'editor_script'   => 'agentivo-chat-block',
			'render_callback' => [ $this, 'render_block' ],
			'attributes'      => [
				'id' => [ 'type' => 'string', 'default' => '' ],
				'width' => [ 'type' => 'string', 'default' => '' ],
				'height' => [ 'type' => 'string', 'default' => '' ],
			],
		] );

		wp_register_script( 'agentivo-chat-block', self::get_asset_url( 'js/block.js' ), [ 'wp-blocks', 'wp-element', 'wp-editor', 'wp-components', 'wp-i18n' ], AGENTIVO_CHATBOTS_VERSION, true );
		wp_set_script_translations( 'agentivo-chat-block', 'agentivo-chatbots', AGENTIVO_CHATBOTS_PLUGIN_DIR . 'languages' );
	}

	public function render_block( array $attributes ): string {
		return $this->render_shortcode( $attributes );
	}

	/**
	 * Lifecycle
	 */
	public function activate(): void {
		$defaults = [
			'agentivo_chatbots_bubble_chat_id' => '',
			'agentivo_chatbots_inline_chat_id' => '',
			'agentivo_chatbots_inline_width'    => '100%',
			'agentivo_chatbots_inline_height'   => '600px',
		];
		foreach ( $defaults as $opt => $val ) {
			if ( false === get_option( $opt ) ) add_option( $opt, $val );
		}
		flush_rewrite_rules();
	}
}

// Initialize
Agentivo_Chatbots::get_instance();