<?php
/**
 * Core plugin bootstrap class.
 *
 * @package MediaRightsAudit\Core
 */

namespace MediaRightsAudit\Core;

use MediaRightsAudit\Admin\AttachmentDetailPage;
use MediaRightsAudit\Admin\AuditPage;
use MediaRightsAudit\Admin\Settings;
use MediaRightsAudit\Admin\ToolsPage;
use MediaRightsAudit\CLI\Command;
use MediaRightsAudit\External\AbstractProvider;
use MediaRightsAudit\External\ExternalScanner;
use MediaRightsAudit\External\GoogleVisionProvider;
use MediaRightsAudit\External\PicDefenseProvider;
use MediaRightsAudit\External\TinEyeProvider;
use MediaRightsAudit\Internal\AttachmentIndexer;
use MediaRightsAudit\Internal\UsageScanner;
use MediaRightsAudit\Privacy\DataEraser;
use MediaRightsAudit\Privacy\DataExporter;

/**
 * Registers all hooks and initialises the plugin subsystems.
 */
class Plugin {

	/**
	 * Settings page handler.
	 *
	 * @var Settings
	 */
	private Settings $settings;

	/**
	 * Audit list page controller.
	 *
	 * @var AuditPage
	 */
	private AuditPage $audit_page;

	/**
	 * Tools & Status page controller.
	 *
	 * @var ToolsPage
	 */
	private ToolsPage $tools_page;

	/**
	 * Attachment detail page controller.
	 *
	 * @var AttachmentDetailPage
	 */
	private AttachmentDetailPage $detail_page;

	/**
	 * Initialises dependencies.
	 */
	public function __construct() {
		$this->settings    = new Settings();
		$this->audit_page  = new AuditPage();
		$this->tools_page  = new ToolsPage();
		$this->detail_page = new AttachmentDetailPage();
	}

	/**
	 * Attaches all WordPress hooks.
	 *
	 * @return void
	 */
	public function run(): void {
		add_action( 'init', array( $this, 'load_textdomain' ) );
		add_action( 'admin_menu', array( $this, 'register_admin_pages' ) );
		add_action( 'admin_init', array( $this->settings, 'register' ) );
		add_action( 'admin_init', array( $this, 'check_db_version' ) );
		add_action( AttachmentIndexer::AS_HOOK, array( AttachmentIndexer::class, 'process_scheduled_batch' ) );
		add_action( UsageScanner::AS_HOOK, array( UsageScanner::class, 'process_scheduled_batch' ) );
		add_action( ExternalScanner::AS_HOOK, array( ExternalScanner::class, 'process_scheduled_batch' ) );
		add_action( 'wp_ajax_mra_run_batch', array( $this->tools_page, 'ajax_run_batch' ) );
		add_filter( 'mra/external/providers', array( $this, 'register_providers' ) );
		add_filter( 'wp_privacy_personal_data_exporters', array( DataExporter::class, 'register' ) );
		add_filter( 'wp_privacy_personal_data_erasers', array( DataEraser::class, 'register' ) );
		$this->audit_page->register_hooks();
		$this->register_cli_commands();
	}

	/**
	 * Loads the plugin text domain.
	 *
	 * @return void
	 */
	public function load_textdomain(): void {
		load_plugin_textdomain(
			'robotstxt-mediaaudit',
			false,
			dirname( plugin_basename( ROBOTSTXT_MEDIAAUDIT_PLUGIN_FILE ) ) . '/languages'
		);
	}

	/**
	 * Registers admin menu pages.
	 *
	 * @return void
	 */
	public function register_admin_pages(): void {
		$suffix = add_menu_page(
			__( 'Media Audit', 'robotstxt-mediaaudit' ),
			__( 'Media Audit', 'robotstxt-mediaaudit' ),
			'edit_others_posts',
			'robotstxt-mediaaudit',
			array( $this->audit_page, 'render' ),
			'dashicons-camera',
			60
		);

		$this->audit_page->set_hook_suffix( $suffix );

		// Rename the auto-created first submenu entry.
		add_submenu_page(
			'robotstxt-mediaaudit',
			__( 'Media Audit', 'robotstxt-mediaaudit' ),
			__( 'Media Audit', 'robotstxt-mediaaudit' ),
			'edit_others_posts',
			'robotstxt-mediaaudit',
			array( $this->audit_page, 'render' )
		);

		$tools_suffix = add_submenu_page(
			'robotstxt-mediaaudit',
			__( 'Tools', 'robotstxt-mediaaudit' ),
			__( 'Tools', 'robotstxt-mediaaudit' ),
			'manage_options',
			'robotstxt-mediaaudit-tools',
			array( $this->tools_page, 'render' )
		);

		if ( is_string( $tools_suffix ) ) {
			$this->tools_page->set_hook_suffix( $tools_suffix );
		}

		add_submenu_page(
			'robotstxt-mediaaudit',
			__( 'Settings', 'robotstxt-mediaaudit' ),
			__( 'Settings', 'robotstxt-mediaaudit' ),
			'manage_options',
			'robotstxt-mediaaudit-settings',
			array( $this->settings, 'render' )
		);

		add_submenu_page(
			'', // hidden from menu.
			__( 'Attachment Report', 'robotstxt-mediaaudit' ),
			'',
			'edit_posts',
			'robotstxt-mediaaudit-detail',
			array( $this->detail_page, 'render' )
		);
	}

	/**
	 * Runs pending DB migrations when the stored schema version is behind the constant.
	 *
	 * @return void
	 */
	public function check_db_version(): void {
		$raw    = get_option( 'robotstxt_mediaaudit_db_version', '0.0.0' );
		$stored = is_string( $raw ) ? $raw : '0.0.0';
		if ( ROBOTSTXT_MEDIAAUDIT_DB_VERSION !== $stored ) {
			Database::run_migrations();
			update_option( 'robotstxt_mediaaudit_db_version', ROBOTSTXT_MEDIAAUDIT_DB_VERSION );
		}
	}

	/**
	 * Registers built-in external providers via the mra/external/providers filter.
	 *
	 * @param mixed $providers Accumulated provider list.
	 *
	 * @return array<\MediaRightsAudit\External\AbstractProvider>
	 */
	public function register_providers( $providers ): array {
		$list = array();
		if ( is_array( $providers ) ) {
			foreach ( $providers as $p ) {
				if ( $p instanceof AbstractProvider ) {
					$list[] = $p;
				}
			}
		}
		$list[] = new GoogleVisionProvider();
		$list[] = new TinEyeProvider();
		if ( $this->is_provider_configured( 'picdefense' ) ) {
			$list[] = new PicDefenseProvider();
		}
		return $list;
	}

	/**
	 * Returns whether a provider has its credentials configured.
	 *
	 * Checks provider-specific option keys in the plugin settings.
	 *
	 * @param string $slug Provider slug (e.g. 'picdefense').
	 *
	 * @return bool
	 */
	private function is_provider_configured( string $slug ): bool {
		$raw  = get_option( Settings::OPTION_NAME, array() );
		$opts = is_array( $raw ) ? $raw : array();

		if ( 'picdefense' === $slug ) {
			$uid = $opts['picdefense_user_id'] ?? '';
			$key = $opts['picdefense_api_key'] ?? '';
			return is_string( $uid ) && '' !== trim( $uid ) && is_string( $key ) && '' !== trim( $key );
		}

		return false;
	}

	/**
	 * Registers WP-CLI commands when running in CLI context.
	 *
	 * @return void
	 */
	private function register_cli_commands(): void {
		if ( defined( 'WP_CLI' ) && WP_CLI ) {
			\WP_CLI::add_command( 'mra', Command::class );
		}
	}
}