<?php

	/**
	 * Redux Framework CDN Container Class
	 *
	 * @author      Kevin Provance (kprovance)
	 * @package     Redux_Framework
	 * @subpackage  Core
	 */

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

if ( ! class_exists( 'Redux_CDN' ) ) {
	class Redux_CDN {
		public static $_parent;
		private static $_set;

		private static function is_enqueued( $handle, $list, $is_script ) {
			if ( empty( $list ) ) {
				$list = 'enqueued';
			}
			if ( $is_script ) {
				wp_script_is( $handle, $list );
			} else {
				wp_style_is( $handle, $list );
			}
		}

		private static function _register( $handle, $src_cdn, $deps, $ver, $footer_or_media, $is_script = true ) {
			if ( $is_script ) {
				wp_register_script( $handle, $src_cdn, $deps, $ver, $footer_or_media );
			} else {
				wp_register_style( $handle, $src_cdn, $deps, $ver, $footer_or_media );
			}
		}

		private static function _enqueue( $handle, $src_cdn, $deps, $ver, $footer_or_media, $is_script = true ) {
			if ( $is_script ) {
				wp_enqueue_script( $handle, $src_cdn, $deps, $ver, $footer_or_media );
			} else {
				wp_enqueue_style( $handle, $src_cdn, $deps, $ver, $footer_or_media );
			}
		}

		private static function _cdn( $register, $handle, $src_cdn, $deps, $ver, $footer_or_media, $is_script = true ) {
			$tran_key = '_style_cdn_is_up';
			if ( $is_script ) {
				$tran_key = '_script_cdn_is_up';
			}

			$cdn_is_up = get_transient( $handle . $tran_key );
			if ( $cdn_is_up ) {
				if ( $register ) {
					self::_register( $handle, $src_cdn, $deps, $ver, $footer_or_media, $is_script );
				} else {
					self::_enqueue( $handle, $src_cdn, $deps, $ver, $footer_or_media, $is_script );
				}
			} else {

				$prefix       = $src_cdn[1] == '/' ? 'http:' : '';
				$cdn_response = @wp_remote_get( $prefix . $src_cdn );

				if ( is_wp_error( $cdn_response ) || wp_remote_retrieve_response_code( $cdn_response ) != '200' ) {
					if ( class_exists( 'Redux_VendorURL' ) ) {
						$src = Redux_VendorURL::get_url( $handle );

						if ( $register ) {
							self::_register( $handle, $src, $deps, $ver, $footer_or_media, $is_script );
						} else {
							self::_enqueue( $handle, $src, $deps, $ver, $footer_or_media, $is_script );
						}
					} else {
						if ( ! self::is_enqueued( $handle, 'enqueued', $is_script ) ) {
							$msg = __( 'Please wait a few minutes, then try refreshing the page. Unable to load some remotely hosted scripts.', 'redux-framework' );
							if ( self::$_parent->args['dev_mode'] ) {
								$msg = sprintf( __( 'If you are developing offline, please download and install the <a href="%s" target="_blank" rel="noopener noreferrer">Redux Vendor Support</a> plugin/extension to bypass the our CDN and avoid this warning', 'redux-framework' ), 'https://github.com/reduxframework/redux-vendor-support' );
							}

							$msg = '<strong>' . esc_html__( 'Redux Framework Warning', 'redux-framework' ) . '</strong><br/>' . sprintf( __( '%s CDN unavailable.  Some controls may not render properly.', 'redux-framework' ), $handle ) . '  ' . $msg;

							$data = array(
								'parent'  => self::$_parent,
								'type'    => 'error',
								'msg'     => $msg,
								'id'      => $handle . $tran_key,
								'dismiss' => false,
							);

							Redux_Admin_Notices::set_notice( $data );
						}
					}
				} else {
					set_transient( $handle . $tran_key, true, MINUTE_IN_SECONDS * self::$_parent->args['cdn_check_time'] );

					if ( $register ) {
						self::_register( $handle, $src_cdn, $deps, $ver, $footer_or_media, $is_script );
					} else {
						self::_enqueue( $handle, $src_cdn, $deps, $ver, $footer_or_media, $is_script );
					}
				}
			}
		}

		private static function _vendor_plugin( $register, $handle, $src_cdn, $deps, $ver, $footer_or_media, $is_script = true ) {
			if ( class_exists( 'Redux_VendorURL' ) ) {
				$src = Redux_VendorURL::get_url( $handle );

				if ( $register ) {
					self::_register( $handle, $src, $deps, $ver, $footer_or_media, $is_script );
				} else {
					self::_enqueue( $handle, $src, $deps, $ver, $footer_or_media, $is_script );
				}
			} else {
				if ( ! self::$_set ) {
					$msg = sprintf( __( 'The <a href="%1$s">Vendor Support plugin</a> (or extension) is either not installed or not activated and thus, some controls may not render properly.  Please ensure that it is installed and <a href="%2$s">activated</a>', 'redux-framework' ), 'https://github.com/reduxframework/redux-vendor-support', admin_url( 'plugins.php' ) );

					$data = array(
						'parent'  => self::$_parent,
						'type'    => 'error',
						'msg'     => $msg,
						'id'      => $handle,
						'dismiss' => false,
					);

					Redux_Admin_Notices::set_notice( $data );

					self::$_set = true;
				}
			}
		}

		public static function register_style( $handle, $src_cdn = false, $deps = array(), $ver = false, $media = 'all' ) {
			if ( self::$_parent->args['use_cdn'] ) {
				self::_cdn( true, $handle, $src_cdn, $deps, $ver, $media, $is_script = false );
			} else {
				self::_vendor_plugin( true, $handle, $src_cdn, $deps, $ver, $media, $is_script = false );
			}
		}

		public static function register_script( $handle, $src_cdn = false, $deps = array(), $ver = false, $in_footer = false ) {
			if ( self::$_parent->args['use_cdn'] ) {
				self::_cdn( true, $handle, $src_cdn, $deps, $ver, $in_footer, $is_script = true );
			} else {
				self::_vendor_plugin( true, $handle, $src_cdn, $deps, $ver, $in_footer, $is_script = true );
			}
		}

		public static function enqueue_style( $handle, $src_cdn = false, $deps = array(), $ver = false, $media = 'all' ) {
			if ( self::$_parent->args['use_cdn'] ) {
				self::_cdn( false, $handle, $src_cdn, $deps, $ver, $media, $is_script = false );
			} else {
				self::_vendor_plugin( false, $handle, $src_cdn, $deps, $ver, $media, $is_script = false );
			}
		}

		public static function enqueue_script( $handle, $src_cdn = false, $deps = array(), $ver = false, $in_footer = false ) {
			if ( self::$_parent->args['use_cdn'] ) {
				self::_cdn( false, $handle, $src_cdn, $deps, $ver, $in_footer, $is_script = true );
			} else {
				self::_vendor_plugin( false, $handle, $src_cdn, $deps, $ver, $in_footer, $is_script = true );
			}
		}
	}
}