<?php
/**
 * Plugin Name: AI Internal Links
 * Plugin URI: https://ai-internal-links.com
 * Description: Automatically generate SEO-optimized internal links in your WordPress content using AI. Improve your site structure and boost rankings with intelligent link suggestions powered by OpenAI.
 * Version: 1.0.12
 * Requires at least: 5.8
 * Requires PHP: 7.4
 * Author: BON'APP STUDIO
 * Author URI: https://bonapp.studio
 * License: GPL v2 or later
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain: ai-internal-links
 * Domain Path: /languages
 *
 * @package AIIL
 */

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

// Define plugin constants.
define( 'AIIL_VERSION', '21' );
define( 'AIIL_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
define( 'AIIL_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
define( 'AIIL_PLUGIN_BASENAME', plugin_basename( __FILE__ ) );
define( 'AIIL_PLUGIN_FILE', __FILE__ );

/**
 * Main plugin class.
 */
final class AIIL_Plugin {

	/**
	 * Plugin instance.
	 *
	 * @var AIIL_Plugin
	 */
	private static $instance = null;

	/**
	 * Get plugin instance.
	 *
	 * @return AIIL_Plugin
	 */
	public static function instance() {
		if ( is_null( self::$instance ) ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Constructor.
	 */
	private function __construct() {
		$this->includes();
		$this->init_hooks();
	}

	/**
	 * Include required files.
	 */
	private function includes() {
		require_once AIIL_PLUGIN_DIR . 'includes/class-aiil-autoloader.php';
		require_once AIIL_PLUGIN_DIR . 'includes/class-aiil-core.php';
		require_once AIIL_PLUGIN_DIR . 'includes/class-aiil-settings.php';
		require_once AIIL_PLUGIN_DIR . 'includes/class-aiil-ajax.php';
		require_once AIIL_PLUGIN_DIR . 'includes/class-aiil-link-generator.php';
		require_once AIIL_PLUGIN_DIR . 'includes/class-aiil-content-analyzer.php';
		require_once AIIL_PLUGIN_DIR . 'includes/class-aiil-admin-notices.php';

		// LLM Provider system.
		require_once AIIL_PLUGIN_DIR . 'includes/llm-providers/interface-aiil-llm-provider.php';
		require_once AIIL_PLUGIN_DIR . 'includes/llm-providers/abstract-aiil-llm-provider-base.php';
		require_once AIIL_PLUGIN_DIR . 'includes/llm-providers/class-aiil-llm-factory.php';
		require_once AIIL_PLUGIN_DIR . 'includes/llm-providers/class-aiil-openai-provider.php';

		// Editor integrations.
		require_once AIIL_PLUGIN_DIR . 'includes/editors/class-aiil-editor-integration.php';
		require_once AIIL_PLUGIN_DIR . 'includes/editors/class-aiil-tinymce-integration.php';
	}

	/**
	 * Initialize hooks.
	 */
	private function init_hooks() {
		add_action( 'init', array( $this, 'maybe_init_core' ) );
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_admin_assets' ) );

		// Activation/deactivation hooks.
		register_activation_hook( AIIL_PLUGIN_FILE, array( $this, 'activate' ) );
		register_deactivation_hook( AIIL_PLUGIN_FILE, array( $this, 'deactivate' ) );
	}

	/**
	 * Initialize core only for users who can edit content.
	 */
	public function maybe_init_core() {
		// Load only if in admin or user can edit posts (for page builders like Elementor).
		if ( is_admin() || current_user_can( 'edit_posts' ) ) {
			AIIL_Core::init();
		}
	}

	/**
	 * Enqueue admin assets.
	 */
	public function enqueue_admin_assets( $hook ) {
		// Enqueue on post editor pages.
		if ( in_array( $hook, array( 'post.php', 'post-new.php' ), true ) ) {
			wp_enqueue_style(
				'aiil-admin',
				AIIL_PLUGIN_URL . 'assets/css/admin.css',
				array(),
				AIIL_VERSION
			);
		}

		// Enqueue on settings pages (main menu pages).
		if ( in_array( $hook, array( 'toplevel_page_ai-internal-links', 'ai-internal-links_page_ai-internal-links-bulk' ), true ) ) {
			wp_enqueue_style(
				'aiil-settings',
				AIIL_PLUGIN_URL . 'assets/css/settings.css',
				array(),
				AIIL_VERSION
			);
		}
	}

	/**
	 * Plugin activation.
	 */
	public function activate() {
		// Set default options.
		$current_settings = get_option( 'aiil_settings', array() );
		$defaults = array(
			'provider'        => 'openai',
			'openai_model'    => 'gpt-4o-mini',
			'max_links'       => 5,
			'post_types'      => array( 'post', 'page' ),
		);

		// Merge with defaults to ensure all keys exist
		$settings = wp_parse_args( $current_settings, $defaults );
		update_option( 'aiil_settings', $settings );

		// Create log directory.
		$upload_dir = wp_upload_dir();
		$log_dir    = $upload_dir['basedir'] . '/ai-internal-links-logs';
		if ( ! file_exists( $log_dir ) ) {
			wp_mkdir_p( $log_dir );
			// Protect log directory.
			file_put_contents( $log_dir . '/.htaccess', 'Deny from all' );
			file_put_contents( $log_dir . '/index.php', '<?php // Silence is golden.' );
		}

		flush_rewrite_rules();
	}

	/**
	 * Plugin deactivation.
	 */
	public function deactivate() {
		flush_rewrite_rules();
	}
}

/**
 * Initialize the plugin.
 */
function aiil() {
	return AIIL_Plugin::instance();
}

// Start the plugin.
aiil();