<?php
namespace Affilizz\Util;

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

use Affilizz\Core;

class Assets {
	// Declare the traits used by the class
	use \Affilizz\Util\Generic;

	public static function get_cache_folder_path() {
		$affilizz_proxy_uuid = get_option( 'affilizz_proxy_uuid' ) ?? Core::regenerate_uuid();
		return trailingslashit( \Affilizz\Core::get_cdn_cache_root_path() ) . $affilizz_proxy_uuid;
	}

	public function get_diverted_js_file_path( $extension = 'rendering' ) {
		// Divert the loading
		$affilizz_proxy_uuid = get_option( 'affilizz_proxy_uuid' ) ?? Core::regenerate_uuid();
		$cache_file_name     = sha1( $affilizz_proxy_uuid . '-' . $extension ) . '.js';

		// Bump the version to the installed version
		return trailingslashit( self::get_cache_folder_path() ) . $cache_file_name;
	}

	public function get_diverted_js_file_url( $extension = 'rendering' ) {
		// Try to copy
		if ( ! ( file_exists( $this->get_diverted_js_file_path() ) ) ) {
			$this->store_local_rendering_files_copy();
		}

		// If for some reason we could not create the file, return the CDN version
		if ( ! ( file_exists( $this->get_diverted_js_file_path() ) ) ) {
			return \Affilizz\Core::get_rendering_script_location();
		}

		// Divert the loading
		$affilizz_proxy_uuid = get_option( 'affilizz_proxy_uuid' ) ?? Core::regenerate_uuid();
		$cache_folder_url    = trailingslashit( \Affilizz\Core::get_cdn_cache_root_url() ) . $affilizz_proxy_uuid;
		$cache_file_name     = sha1( $affilizz_proxy_uuid . '-' . $extension ) . '.js';

		// Bump the version to the installed version
		return trailingslashit( $cache_folder_url ) . $cache_file_name;
	}

	/**
	 * Version of the rendering script URL : the date of the local copy, so that the browsers and the
	 * page caches load a refreshed copy instead of the one they hold under the same URL.
	 * @author Affilizz <wordpress@affilizz.com>
	 * @since 1.18.0
	 * @return string The version.
	 */
	public function get_diverted_js_file_version() {
		$local_file = $this->get_diverted_js_file_path();
		return file_exists( $local_file ) ? (string) filemtime( $local_file ) : AFFILIZZ_VERSION;
	}

	public function get_diverted_css_file_path() {
		// Divert the loading
		$affilizz_proxy_uuid = get_option( 'affilizz_proxy_uuid' ) ?? Core::regenerate_uuid();
		$cache_folder_path   = trailingslashit( \Affilizz\Core::get_cdn_cache_root_path() ) . $affilizz_proxy_uuid;
		$cache_file_name     = sha1( $affilizz_proxy_uuid ) . '.css';

		// Bump the version to the installed version
		return trailingslashit( $cache_folder_path ) . $cache_file_name;
	}

	public function get_diverted_css_file_url() {
		// Try to copy
		if ( ! ( file_exists( $this->get_diverted_css_file_path() ) ) ) {
			$this->store_local_rendering_files_copy();
		}

		// If for some reason we could not create the file, return the CDN version
		if ( ! ( file_exists( $this->get_diverted_css_file_path() ) ) ) {
			return \Affilizz\Core::get_rendering_style_location();
		}

		// Divert the loading
		$affilizz_proxy_uuid = get_option( 'affilizz_proxy_uuid' ) ?? Core::regenerate_uuid();
		$cache_folder_url    = trailingslashit( \Affilizz\Core::get_cdn_cache_root_url() ) . $affilizz_proxy_uuid;
		$cache_file_name     = sha1( $affilizz_proxy_uuid ) . '.css';

		// Bump the version to the installed version
		return trailingslashit( $cache_folder_url ) . $cache_file_name;
	}

	public function store_local_rendering_files_copy() {
		( Core::get_instance() )->init_cache_directories();
		foreach ( array(
			array(
				'location'    => \Affilizz\Core::get_rendering_script_location(),
				'local_file'  => $this->get_diverted_js_file_path(),
				'oldest_time' => time() - ( \Affilizz\Core::get_cdn_cache_time() ?? 0 ),
			),
			array(
				'location'    => \Affilizz\Core::get_rendering_style_location(),
				'local_file'  => $this->get_diverted_css_file_path(),
				'oldest_time' => time() - ( 15 * MINUTE_IN_SECONDS ),
			),
		) as $file ) {
			if ( empty( $file['location'] ) ) {
				continue;
			}

			$remote_file_url = add_query_arg( array( 'cache_var' => time() ), $file['location'] );
			$local_file      = $file['local_file'];

			// Check if the file exists and create it if not (method for specific hosting providers)
			$file_did_exist = file_exists( $local_file );
			if ( ! $file_did_exist ) {
				global $wp_filesystem;
				if ( empty( $wp_filesystem ) ) {
					require_once ABSPATH . 'wp-admin/includes/file.php';
					WP_Filesystem();
				}
				$wp_filesystem->put_contents( $local_file, '', FS_CHMOD_FILE );
			}

			// Check if the file is older than the oldest time
			if ( ! $file_did_exist || filemtime( $local_file ) < ( $file['oldest_time'] ) ) {
				$response         = wp_remote_get( $remote_file_url, array( 'timeout' => \Affilizz\Core::get_api_http_timeout() ) );
				$remote_file_body = wp_remote_retrieve_body( $response );

				// A failed download keeps the current copy, or leaves none so that the CDN is used : never an empty script
				if ( 200 !== (int) wp_remote_retrieve_response_code( $response ) || '' === $remote_file_body ) {
					if ( ! $file_did_exist ) {
						wp_delete_file( $local_file );
					}
					continue;
				}

				global $wp_filesystem;
				if ( empty( $wp_filesystem ) ) {
					require_once ABSPATH . 'wp-admin/includes/file.php';
					WP_Filesystem();
				}
				$wp_filesystem->put_contents( $local_file, '/* Loaded from local cache - ' . time() . ' */' . $remote_file_body, FS_CHMOD_FILE );
			}
		}
	}
}