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(function () {
    'use strict';

    function PDFService(jsPDF, html2canvas, $document, $window) {

        var docu = $document[0];

        /**
         * Takes image url and convert into base64 string
         * @param url Image URL
         * @param callback function
         */
        function convertImgToDataURL(url, callback) {
            var img = new Image();
            img.crossOrigin = 'Anonymous'; //solve CORS issue

            img.onload = function () {
                var canvas = docu.createElement('canvas');
                var ctx = canvas.getContext('2d');
                var dataURL;
                canvas.height = this.height;
                canvas.width = this.width;
                ctx.drawImage(this, 0, 0);
                dataURL = canvas.toDataURL('image/png', 1.0);
                callback(dataURL);
                canvas = null;
            };

            img.onerror = function () {
                callback(false);
            };

            img.src = url;
        }

        /**
         * Take a html element, convert into image, add into pdf doc, output a pdf file
         * @param div Html element context
         */
        function exportToPDF(div) {
            /**
             *@source https://html2canvas.hertzen.com/documentation.html
             */
            html2canvas(div, {
                useCORS: true, //try to load images from other domains as well
                logging: false, //enable it if u want see log messages in console
                onrendered: function (canvas) {

                    var imgData = canvas.toDataURL('image/jpeg', 1.0);

                    //window.open(imgData); //use this for testing only

                    var pdf = new jsPDF('l', 'mm');

                    pdf.setProperties({
                        title: 'Custom Rug Design',
                        author: 'surya.com'
                    });

                    //don't use name alias name again
                    var alias = Math.random().toString(35);
                    pdf.addImage(imgData, 'JPEG', 10, 30, void 0, void 0, alias, true);

                    pdf.setFontSize(14);
                    pdf.text(10, 10, 'Exported from Surya.com -' + new Date().toDateString());

                    pdf.save('dyo-export-' + +new Date() + '.pdf');

                }
            });
        }

        return {
            //todo try to use $q style promise
            save: function (callback) {
                var div = docu.querySelector('#sr-canvas'), // container id which  u want to include in pdf
                    img = docu.querySelector('#sr-preview');//image id that will be convert into base64

                convertImgToDataURL(img.src, function (result) {
                    if (result) {
                        $window.scrollTo(0, 150);
                        img.src = result;
                        exportToPDF(div);
                        callback(true);
                    } else {
                        callback(false);
                    }
                });
            }
        };

    }

    angular.module('rugApp').factory('PDFService', PDFService);
})();