<?php
/**
 * Main plugin bootstrap.
 *
 * @package Spinix_Image_Optimization
 */

defined( 'ABSPATH' ) || exit;

/**
 * Class Spinix_Image_Optimization_Plugin
 */
final class Spinix_Image_Optimization_Plugin {

	/**
	 * Instance.
	 *
	 * @var Spinix_Image_Optimization_Plugin|null
	 */
	private static $instance = null;

	/**
	 * Singleton.
	 *
	 * @return Spinix_Image_Optimization_Plugin
	 */
	public static function instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Constructor.
	 */
	private function __construct() {

		self::maybe_upgrade();
		Spinix_Image_Optimization_Conflicts::init();
		Spinix_Image_Optimization_Lifecycle::init();
		Spinix_Image_Optimization_Bulk::init();
		Spinix_Image_Optimization_Frontend::init();
		Spinix_Image_Optimization_Hero::init();
		Spinix_Image_Optimization_Media::init();
		if ( is_admin() ) {
			Spinix_Image_Optimization_Admin::init();
		}

		add_filter( 'wp_generate_attachment_metadata', array( $this, 'on_generate_metadata' ), 9999, 2 );
		add_filter( 'wp_update_attachment_metadata', array( $this, 'on_update_metadata' ), 9999, 2 );
		add_action( 'delete_attachment', array( $this, 'on_delete_attachment' ) );
		add_action( 'deactivated_plugin', array( $this, 'maybe_resume' ), 20, 1 );
		add_action( 'admin_init', array( __CLASS__, 'enforce_activation_block' ), 1 );
		add_filter( 'plugin_action_links_' . plugin_basename( SPINIX_IMAGE_OPTIMIZATION_FILE ), array( $this, 'action_links' ) );
		add_action( 'admin_enqueue_scripts', array( __CLASS__, 'notice_styles' ) );
	}

	/**
	 * Admin screens where the plugin may show its notices: the Plugins screen, the
	 * Dashboard and the plugin's own screen. Nothing is shown anywhere else.
	 *
	 * @return bool
	 */
	public static function notice_screen() {
		$screen = function_exists( 'get_current_screen' ) ? get_current_screen() : null;
		return $screen && in_array( $screen->id, array( 'plugins', 'dashboard', 'toplevel_page_' . Spinix_Image_Optimization_Admin::SLUG ), true );
	}

	/**
	 * Styles for the plugin's admin notices (only where they can appear).
	 */
	public static function notice_styles() {
		if ( current_user_can( 'activate_plugins' ) && self::notice_screen() ) {
			wp_enqueue_style( 'spinix-io-notices', SPINIX_IMAGE_OPTIMIZATION_URL . 'assets/css/notices.css', array(), SPINIX_IMAGE_OPTIMIZATION_VERSION );
		}
	}

	/**
	 * Remember the installed version (for future upgrade routines).
	 */
	private static function maybe_upgrade() {
		if ( SPINIX_IMAGE_OPTIMIZATION_VERSION !== get_option( 'spinix_io_version' ) && false !== get_option( Spinix_Image_Optimization_Settings::OPTION, false ) ) {
			update_option( 'spinix_io_version', SPINIX_IMAGE_OPTIMIZATION_VERSION, false );
		}
	}

	/**
	 * Optimize right after WordPress has generated all sizes for an upload.
	 *
	 * @param array $metadata Metadata.
	 * @param int   $id       Attachment ID.
	 * @return array
	 */
	public function on_generate_metadata( $metadata, $id ) {
		if ( ! Spinix_Image_Optimization_Settings::get( 'optimize_on_upload' ) || ! is_array( $metadata ) || Spinix_Image_Optimization_Conflicts::paused() || Spinix_Image_Optimization_Lifecycle::is_paused() ) {
			return $metadata;
		}
		if ( ! in_array( get_post_mime_type( $id ), Spinix_Image_Optimization_Optimizer::mimes(), true ) ) {
			return $metadata;
		}
		/**
		 * Return false to optimize uploads in the background instead of during the upload request.
		 *
		 * @param bool $inline Inline.
		 * @param int  $id     Attachment ID.
		 */
		if ( apply_filters( 'spinix_io_optimize_inline', true, $id ) ) {
			try {
				Spinix_Image_Optimization_Bulk::log( array( Spinix_Image_Optimization_Optimizer::optimize( $id, true, $metadata ) ) );
			} catch ( Throwable $e ) {
				wp_schedule_single_event( time() + 30, Spinix_Image_Optimization_Bulk::SINGLE_HOOK, array( (int) $id ) );
			}
		} else {
			wp_schedule_single_event( time() + 5, Spinix_Image_Optimization_Bulk::SINGLE_HOOK, array( (int) $id ) );
		}
		return $metadata;
	}

	/**
	 * Re-optimize when an image is edited (crop/rotate in the media editor).
	 *
	 * @param array $metadata Metadata.
	 * @param int   $id       Attachment ID.
	 * @return array
	 */
	public function on_update_metadata( $metadata, $id ) {
		if ( 'optimized' !== get_post_meta( $id, Spinix_Image_Optimization_Optimizer::META_STATUS, true ) ) {
			return $metadata;
		}
		$data = get_post_meta( $id, Spinix_Image_Optimization_Optimizer::META_DATA, true );
		$file = get_attached_file( $id );
		$rel  = $file ? Spinix_Image_Optimization_Storage::relative( $file ) : false;
		if ( is_array( $data ) && $rel && isset( $data['source'] ) && $data['source'] !== $rel ) {
			if ( ! wp_next_scheduled( Spinix_Image_Optimization_Bulk::SINGLE_HOOK, array( (int) $id ) ) ) {
				wp_schedule_single_event( time() + 5, Spinix_Image_Optimization_Bulk::SINGLE_HOOK, array( (int) $id ) );
			}
		}
		return $metadata;
	}

	/**
	 * Activation was refused (another optimizer is active): switch Spinix off again
	 * right away and explain why, with a one-click way to fix it.
	 */
	public static function enforce_activation_block() {
		if ( false === get_option( 'spinix_io_activation_blocked', false ) ) {
			return;
		}
		$files = (array) get_option( 'spinix_io_activation_blocked', array() );
		$names = (string) get_option( 'spinix_io_activation_blocked_names', '' );
		delete_option( 'spinix_io_activation_blocked' );
		delete_option( 'spinix_io_activation_blocked_names' );
		if ( ! function_exists( 'deactivate_plugins' ) ) {
			require_once ABSPATH . 'wp-admin/includes/plugin.php';
		}
		deactivate_plugins( plugin_basename( SPINIX_IMAGE_OPTIMIZATION_FILE ), true );
		unset( $_GET['activate'], $_GET['activate-multi'] ); // phpcs:ignore WordPress.Security.NonceVerification -- hide "Plugin activated."
		add_action(
			'admin_notices',
			static function () use ( $files, $names ) {
				if ( ! current_user_can( 'activate_plugins' ) ) {
					return;
				}
				echo '<div class="notice notice-error spinix-io-notice">';
				echo '<p class="spinix-io-notice-title"><strong>' . esc_html__( 'Spinix Image Optimization was not activated', 'spinix-image-optimization' ) . '</strong></p>';
				/* translators: %s: plugin names */
				echo '<p class="spinix-io-notice-text">' . esc_html( sprintf( __( '%s is already optimizing your images. Two image optimizers on one site convert and rewrite the same images and break each other. Deactivate it first, then activate Spinix Image Optimization again.', 'spinix-image-optimization' ), $names ) ) . '</p><p class="spinix-io-notice-actions">';
				foreach ( array_filter( $files ) as $file ) {
					$url  = wp_nonce_url( admin_url( 'plugins.php?action=deactivate&plugin=' . rawurlencode( $file ) ), 'deactivate-plugin_' . $file );
					$data = get_plugins();
					$name = isset( $data[ $file ]['Name'] ) ? $data[ $file ]['Name'] : $file;
					/* translators: %s: plugin name */
					echo '<a class="button button-primary" href="' . esc_url( $url ) . '">' . esc_html( sprintf( __( 'Deactivate %s', 'spinix-image-optimization' ), $name ) ) . '</a>';
				}
				echo '</p></div>';
			}
		);
	}

	/**
	 * The conflicting plugin was deactivated: start optimizing right away.
	 *
	 * @param string $plugin Plugin basename that was deactivated.
	 */
	public function maybe_resume( $plugin = '' ) {
		if ( plugin_basename( SPINIX_IMAGE_OPTIMIZATION_FILE ) === $plugin ) {
			return; // Spinix itself is being deactivated.
		}
		// WordPress saves the new list of active plugins only after this hook,
		// so check once the request has finished.
		if ( ! has_action( 'shutdown', array( $this, 'resume_check' ) ) ) {
			add_action( 'shutdown', array( $this, 'resume_check' ) );
		}
	}

	/**
	 * Start optimizing when nothing blocks Spinix anymore.
	 */
	public function resume_check() {
		wp_cache_delete( 'alloptions', 'options' );
		Spinix_Image_Optimization_Conflicts::flush();
		if ( ! Spinix_Image_Optimization_Conflicts::paused() && 'running' !== Spinix_Image_Optimization_Bulk::state() && Spinix_Image_Optimization_Bulk::pending_ids( 1 ) ) {
			Spinix_Image_Optimization_Bulk::start();
		}
	}

	/**
	 * Remove our files when the attachment is deleted.
	 *
	 * @param int $id Attachment ID.
	 */
	public function on_delete_attachment( $id ) {
		Spinix_Image_Optimization_Optimizer::delete_files( (int) $id );
	}

	/**
	 * Plugin list links.
	 *
	 * @param array $links Links.
	 * @return array
	 */
	public function action_links( $links ) {
		$url = admin_url( 'admin.php?page=' . Spinix_Image_Optimization_Admin::SLUG );
		array_unshift(
			$links,
			'<a href="' . esc_url( $url ) . '">' . esc_html__( 'Dashboard', 'spinix-image-optimization' ) . '</a>',
			'<a href="' . esc_url( $url . '#settings' ) . '">' . esc_html__( 'Settings', 'spinix-image-optimization' ) . '</a>'
		);
		return $links;
	}

	/**
	 * Activation.
	 */
	public static function activate() {
		// Refuse to run next to another image optimizer (they would fight over the same images).
		Spinix_Image_Optimization_Conflicts::flush();
		$found = Spinix_Image_Optimization_Conflicts::detect();
		if ( ! empty( $found['optimizers'] ) && ! ( defined( 'SPINIX_IMAGE_OPTIMIZATION_ALLOW_CONFLICTS' ) && SPINIX_IMAGE_OPTIMIZATION_ALLOW_CONFLICTS ) ) {
			$names = implode( ', ', wp_list_pluck( $found['optimizers'], 'name' ) );
			if ( defined( 'WP_CLI' ) && WP_CLI ) {
				WP_CLI::error( sprintf( 'Spinix Image Optimization was not activated: %s is active. Deactivate it first (two image optimizers on one site break each other).', $names ) );
			}
			update_option( 'spinix_io_activation_blocked', wp_list_pluck( $found['optimizers'], 'file' ) + array(), false );
			update_option( 'spinix_io_activation_blocked_names', $names, false );
			return;
		}
		delete_option( 'spinix_io_activation_blocked' );
		if ( false === get_option( Spinix_Image_Optimization_Settings::OPTION, false ) ) {
			add_option( Spinix_Image_Optimization_Settings::OPTION, Spinix_Image_Optimization_Settings::defaults(), '', 'no' );
		}
		Spinix_Image_Optimization_Settings::flush();
		Spinix_Image_Optimization_Storage::ensure_dir();
		update_option( 'spinix_io_version', SPINIX_IMAGE_OPTIMIZATION_VERSION, false );

		if ( Spinix_Image_Optimization_Settings::get( 'scan_on_activation' ) && 'paused' !== get_option( Spinix_Image_Optimization_Bulk::STATE_OPTION ) && ! Spinix_Image_Optimization_Conflicts::paused() ) {
			// Make sure our schedule exists before scheduling the event.
			add_filter( 'cron_schedules', array( 'Spinix_Image_Optimization_Bulk', 'schedules' ) ); // phpcs:ignore WordPress.WP.CronInterval -- one-minute interval while a bulk run is active.
			Spinix_Image_Optimization_Bulk::start();
			set_transient( 'spinix_io_activation_notice', 1, DAY_IN_SECONDS );
		}
	}

	/**
	 * Deactivation: stop background jobs, keep files and settings.
	 */
	public static function deactivate() {
		wp_clear_scheduled_hook( Spinix_Image_Optimization_Bulk::CRON_HOOK );
		wp_unschedule_hook( Spinix_Image_Optimization_Bulk::SINGLE_HOOK );
		if ( 'running' === get_option( Spinix_Image_Optimization_Bulk::STATE_OPTION ) ) {
			update_option( Spinix_Image_Optimization_Bulk::STATE_OPTION, 'idle', false );
		}
		Spinix_Image_Optimization_Bulk::unlock();
	}
}