( function ( $ ) {
	var CartFlowsAPILocalCache = {
		/**
		 * timeout for cache in millis
		 *
		 * @type {number}
		 */
		timeout: 300000,

		/**
		 * @type {{_: number, data: {}}}
		 **/
		data: {},

		/**
		 * Remove cache
		 *
		 * @param  {[type]} url [description]
		 * @return {[type]}     [description]
		 */
		remove( url ) {
			delete CartFlowsAPILocalCache.data[ url ];
		},

		/**
		 * Check cache
		 *
		 * @param  {[type]} url [description]
		 * @return {[type]}     [description]
		 */
		exist( url ) {
			return (
				!! CartFlowsAPILocalCache.data[ url ] &&
				new Date().getTime() - CartFlowsAPILocalCache.data[ url ]._ <
					CartFlowsAPILocalCache.timeout
			);
		},

		/**
		 * Get cache
		 *
		 * @param  {[type]} url [description]
		 * @return {[type]}     [description]
		 */
		get( url ) {
			return CartFlowsAPILocalCache.data[ url ].data;
		},

		/**
		 * Set cache
		 *
		 * @param {[type]}   url        [description]
		 * @param {[type]}   cachedData [description]
		 * @param {Function} callback   [description]
		 */
		set( url, cachedData, callback ) {
			CartFlowsAPILocalCache.remove( url );

			CartFlowsAPILocalCache.data[ url ] = {
				_: new Date().getTime(),
				data: cachedData,
			};

			if ( callback && typeof callback === 'function' ) {
				callback( cachedData );
			}
		},
	};

	$.ajaxPrefilter( function ( options, originalOptions, jqXHR ) {
		if ( 'cartflows' !== options.author ) {
			return;
		}

		const complete = originalOptions.complete || $.noop,
			url = originalOptions.url;

		options.beforeSend = function () {
			if ( CartFlowsAPILocalCache.exist( url ) ) {
				const data = CartFlowsAPILocalCache.get( url );

				// Load from cache.
				CartFlowsAPI._api_cached_request( data );
				return false;
			}
			return true;
		};
		options.complete = function ( XHR, status ) {
			const data = {
				args: options.args,
				items: XHR.responseText ? JSON.parse( XHR.responseText ) : '',
				items_count: XHR.getResponseHeader( 'x-wp-total' ) || 0,
				callback: options.callback,

				// AJAX response.
				status,
				XHR,
			};

			CartFlowsAPILocalCache.set( url, data, complete );
		};
	} );

	CartFlowsAPI = {
		/**
		 * Debugging.
		 *
		 * @param {mixed} data Mixed data.
		 * @param format
		 */
		_log( data, format ) {
			if ( CartFlowsImportVars.debug ) {
				if ( 'table' === format ) {
					console.table( data );
				} else {
					const date = new Date();
					const time = date.toLocaleTimeString();

					if ( typeof data === 'object' ) {
						console.log(
							'%c ' + JSON.stringify( data ) + ' ' + time,
							'background: #ededed; color: #444'
						);
					} else {
						console.log(
							'%c ' + data + ' ' + time,
							'background: #ededed; color: #444'
						);
					}
				}
			}
		},

		_api_url: CartFlowsImportVars.server_rest_url,

		_api_cached_request( data ) {
			CartFlowsAPI._log( CartFlowsAPILocalCache.data, 'table' );
			CartFlowsAPI._log( 'Current time ' + new Date().getTime() );
			CartFlowsAPI._log(
				'Cache expired in ' +
					parseInt( CartFlowsAPILocalCache.timeout ) / 1000 +
					' seconds.'
			);

			if ( undefined !== data.args.trigger && '' !== data.args.trigger ) {
				$( document ).trigger( data.args.trigger, [ data ] );
			}

			if ( data.callback && typeof data.callback === 'function' ) {
				data.callback( data );
			}
		},

		_api_request( args, callback ) {
			// Set API Request Data.
			const data = {
				url: CartFlowsAPI._api_url + args.slug,
				args,
				callback,
				headers: CartFlowsImportVars.headers,
				author: 'cartflows',
			};

			$.ajax( data )
				.done( function ( items, status, XHR ) {
					if (
						'success' === status &&
						XHR.getResponseHeader( 'x-wp-total' )
					) {
						var data = {
							args,
							items,
							items_count:
								XHR.getResponseHeader( 'x-wp-total' ) || 0,
							callback,

							// AJAX response.
							status,
							XHR,
						};

						if (
							undefined !== args.trigger &&
							'' !== args.trigger
						) {
							$( document ).trigger( args.trigger, [ data ] );
						}
					} else {
						$( document ).trigger( 'cartflows-api-request-error' );
					}

					if ( callback && typeof callback === 'function' ) {
						callback( data );
					}
				} )
				.fail( function ( jqXHR, textStatus ) {
					$( document ).trigger( 'cartflows-api-request-fail', [
						data,
						jqXHR,
						textStatus,
					] );
				} )
				.always( function () {
					$( document ).trigger( 'cartflows-api-request-always' );
				} );
		},
	};
} )( jQuery );