<?php
/**
 * Image Importer
 *
 * => How to use?
 *
 *  $image = array(
 *      'url' => '<image-url>',
 *      'id'  => '<image-id>',
 *  );
 *
 *  $downloaded_image = CartFlows_Importer_Core::get_instance()->import( $image );
 *
 * @package CartFlows
 * @since 1.0.0
 */

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

	/**
	 * CartFlows Importer
	 *
	 * @since 1.0.0
	 */
	class CartFlows_Importer_Core {

		/**
		 * Instance
		 *
		 * @since 1.0.0
		 * @var object Class object.
		 * @access private
		 */
		private static $instance;

		/**
		 * Images IDs
		 *
		 * @var array   The Array of already image IDs.
		 * @since 1.0.0
		 */
		private $already_imported_ids = array();

		/**
		 * Initiator
		 *
		 * @since 1.0.0
		 * @return object initialized object of class.
		 */
		public static function get_instance() {
			if ( ! isset( self::$instance ) ) {
				self::$instance = new self();
			}
			return self::$instance;
		}

		/**
		 * Constructor
		 *
		 * @since 1.0.0
		 */
		public function __construct() {

			if ( ! function_exists( 'WP_Filesystem' ) ) {
				require_once ABSPATH . 'wp-admin/includes/file.php';
			}

			WP_Filesystem();
		}

		/**
		 * Process Image Download
		 *
		 * @since 1.0.0
		 * @param  array $attachments Attachment array.
		 * @return array              Attachment array.
		 */
		public function process( $attachments ) {

			$downloaded_images = array();

			foreach ( $attachments as $key => $attachment ) {
				$downloaded_images[] = $this->import( $attachment );
			}

			return $downloaded_images;
		}

		/**
		 * Get Hash Image.
		 *
		 * @since 1.0.0
		 * @param  string $attachment_url Attachment URL.
		 * @return string                 Hash string.
		 */
		private function get_hash_image( $attachment_url ) {
			return sha1( $attachment_url );
		}

		/**
		 * Get Saved Image.
		 *
		 * @since 1.0.0
		 * @param  string $attachment   Attachment Data.
		 * @return string                 Hash string.
		 */
		private function get_saved_image( $attachment ) {

			wcf()->logger->import_log( 'importer-core.php File' );

			if ( apply_filters( 'cartflows_image_importer_skip_image', false, $attachment ) ) {

				self::log( 'Download (✕) Replace (✕) - ' . $attachment['url'] );

				return $attachment;
			}

			global $wpdb;

			// Already imported? Then return!
			if ( isset( $this->already_imported_ids[ $attachment['id'] ] ) ) {

				self::log( 'Download (✓) Replace (✓) - ' . $attachment['url'] );

				return $this->already_imported_ids[ $attachment['id'] ];
			}

			// 1. Is already imported in Batch Import Process?
			$post_id = $wpdb->get_var(
				$wpdb->prepare(
					'SELECT `post_id` FROM `' . $wpdb->postmeta . '`
						WHERE `meta_key` = \'_cartflows_image_hash\'
							AND `meta_value` = %s
					;',
					$this->get_hash_image( $attachment['url'] )
				)
			); // db call ok; no-cache ok.

			// 2. Is image already imported though XML?
			if ( empty( $post_id ) ) {

				// Get file name without extension.
				// To check it exist in attachment.
				$filename = preg_replace( '/\\.[^.\\s]{3,4}$/', '', basename( $attachment['url'] ) );

				$post_id = $wpdb->get_var(
					$wpdb->prepare(
						'SELECT `post_id` FROM `' . $wpdb->postmeta . '`
							WHERE `meta_key` = \'_wp_attached_file\'
							AND `meta_value` LIKE %s
						;',
						'%' . $filename . '%'
					)
				); // db call ok; no-cache ok.

				self::log( 'Download (✕) Replace (✕) - ' . $attachment['url'] );
			}

			if ( $post_id ) {

				$new_imgage_url                                  = wp_get_attachment_url( $post_id );
				$new_attachment                                  = array(
					'id'  => $post_id,
					'url' => $new_imgage_url,
				);
				$this->already_imported_ids[ $attachment['id'] ] = $new_attachment;

				self::log( 'Download (✓) Replace (✓) - ' . $new_imgage_url );
				return $new_attachment;
			}

			return false;
		}

		/**
		 * Import Image
		 *
		 * @since 1.0.0
		 * @param  array $attachment Attachment array.
		 * @return array              Attachment array.
		 */
		public function import( $attachment ) {

			$saved_image = $this->get_saved_image( $attachment );
			if ( $saved_image ) {
				return $saved_image;
			}

			$args = array(
				'timeout' => 300, //phpcs:ignore WordPressVIPMinimum.Performance.RemoteRequestTimeout.timeout_timeout
			);

			$file_content = wp_remote_retrieve_body( wp_safe_remote_get( $attachment['url'], $args ) );

			// Empty file content?
			if ( empty( $file_content ) ) {

				self::log( 'Download (✕) Replace (✕) - ' . $attachment['url'] );
				self::log( 'Error: Failed wp_remote_retrieve_body().' );

				return $attachment;
			}

			// Extract the file name and extension from the URL.
			$filename = basename( $attachment['url'] );

			$upload = wp_upload_bits(
				$filename,
				null,
				$file_content
			);

			$post = array(
				'post_title' => $filename,
				'guid'       => $upload['url'],
			);

			$info = wp_check_filetype( $upload['file'] );
			if ( $info ) {
				$post['post_mime_type'] = $info['type'];
			} else {
				// For now just return the origin attachment.
				return $attachment;
			}

			$post_id = wp_insert_attachment( $post, $upload['file'] );
			wp_update_attachment_metadata(
				$post_id,
				wp_generate_attachment_metadata( $post_id, $upload['file'] )
			);
			update_post_meta( $post_id, '_cartflows_image_hash', $this->get_hash_image( $attachment['url'] ) );

			$new_attachment = array(
				'id'  => $post_id,
				'url' => $upload['url'],
			);

			self::log( 'Download (✓) Replace (✓) - ' . $attachment['url'] );

			$this->already_imported_ids[ $attachment['id'] ] = $new_attachment;

			return $new_attachment;
		}

		/**
		 * Debugging Log.
		 *
		 * @since 1.0.0
		 * @param  mixed $log Log data.
		 * @return void
		 */
		public static function log( $log ) {

			if ( ! WP_DEBUG_LOG ) {
				return;
			}

			if ( is_array( $log ) || is_object( $log ) ) {
				// Logging is for debugging.Hence ignoring phpcs rule.
				wcf()->logger->import_log( print_r( $log, true ) ); // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_print_r
			} else {
				wcf()->logger->import_log( $log );
			}
		}

	}

	/**
	 * Initialize class object with 'get_instance()' method
	 */
	CartFlows_Importer_Core::get_instance();

endif;