<?php
namespace Imagify\ThirdParty\EnableMediaReplace;

use Imagify\Traits\InstanceGetterTrait;
use Imagify_Enable_Media_Replace_Deprecated;
use Imagify_Filesystem;

/**
 * Compat class for Enable Media Replace plugin.
 *
 * @since 1.6.9
 */
class Main extends Imagify_Enable_Media_Replace_Deprecated {
	use InstanceGetterTrait;

	/**
	 * The media ID.
	 *
	 * @var   int
	 * @since 1.9
	 */
	protected $media_id;

	/**
	 * The process instance for the current attachment.
	 *
	 * @var   ProcessInterface
	 * @since 1.9
	 */
	protected $process;

	/**
	 * The path to the old backup file.
	 *
	 * @var   string
	 * @since 1.6.9
	 */
	protected $old_backup_path;

	/**
	 * List of paths to the old next-gen files.
	 *
	 * @var   array
	 * @since 1.9.8
	 */
	protected $old_nextgen_paths = [];

	/**
	 * Launch the hooks before the files and data are replaced.
	 *
	 * @since 1.6.9
	 * @since 1.9.10 The parameter changed from boolean to array. The method doesn’t return anything.
	 *
	 * @param array $args An array containing the post ID.
	 */
	public function init( $args = [] ) {
		if ( is_array( $args ) && ! empty( $args['post_id'] ) ) {
			$this->media_id = $args['post_id'];
		} else {
			// Backward compatibility.
			$this->media_id = (int) filter_input( INPUT_POST, 'ID' );
			$this->media_id = max( 0, $this->media_id );

			if ( ! $this->media_id ) {
				return;
			}
		}

		// Store the old backup file path.
		$this->get_process();

		if ( ! $this->process ) {
			$this->media_id = 0;
			return;
		}

		$this->old_backup_path = $this->process->get_media()->get_backup_path();

		if ( ! $this->old_backup_path ) {
			$this->media_id = 0;
			return;
		}

		/**
		 * Keep track of existing next-gen files.
		 *
		 * Whether the user chooses to rename the files or not, we will need to delete the current next-gen files before creating new ones:
		 * - Rename the files: the old ones must be removed, they are useless now.
		 * - Do not rename the files: the thumbnails may still get new names because of the suffix containing the image dimensions, which may differ (for example when thumbnails are scaled, not cropped).
		 * In this last case, the thumbnails with the old dimensions are removed from the drive and from the WP’s post meta, so there is no need of keeping orphan next-gen files that would stay on the drive for ever, even after the attachment is deleted from WP.
		 */
		foreach ( $this->process->get_media()->get_media_files() as $media_file ) {
			foreach ( [ 'avif', 'webp' ] as $format ) {
				$this->old_nextgen_paths[] = imagify_path_to_nextgen( $media_file['path'], $format );
			}
		}

		// Delete the old backup file and old next-gen files.
		add_action( 'imagify_before_auto_optimization',         [ $this, 'delete_backup' ] );
		add_action( 'imagify_not_optimized_attachment_updated', [ $this, 'delete_backup' ] );
	}

	/**
	 * Delete previous backup file and next-gen files.
	 * This is done after the images have been already replaced by Enable Media Replace.
	 *
	 * @since 1.8.4
	 *
	 * @param int $media_id The attachment ID.
	 */
	public function delete_backup( $media_id ) {
		if ( ! $this->old_backup_path || ! $this->media_id || $media_id !== $this->media_id ) {
			return;
		}

		$filesystem = Imagify_Filesystem::get_instance();

		if ( $filesystem->exists( $this->old_backup_path ) ) {
			// Delete old backup file.
			$filesystem->delete( $this->old_backup_path );
			$this->old_backup_path = false;
		}

		if ( ! empty( $this->old_nextgen_paths ) ) {
			// Delete old next-gen files.
			$this->old_nextgen_paths = array_filter( $this->old_nextgen_paths, [ $filesystem, 'exists' ] );
			array_map( [ $filesystem, 'delete' ], $this->old_nextgen_paths );
			$this->old_nextgen_paths = [];
		}
	}

	/**
	 * Get the optimization process corresponding to the current media.
	 *
	 * @since 1.9
	 *
	 * @return ProcessInterface|bool False if invalid.
	 */
	protected function get_process() {
		if ( isset( $this->process ) ) {
			return $this->process;
		}

		$this->process = imagify_get_optimization_process( $this->media_id, 'wp' );

		if ( ! $this->process->is_valid() ) {
			$this->process = false;
		}

		return $this->process;
	}
}
