// ==UserScript==
// @name         下载道客巴巴里面的文章 -- 测试中
// @namespace    http://tampermonkey.net/
// @version      0.1.5
// @description  下载道客巴巴里面的文章
// @author       You
// @match        https://www.doc88.com/p-*
// @grant        none
// @downloadURL none
// ==/UserScript==

(function (root, factory) {
	if (typeof define === 'function' && define.amd) {
		// AMD. Register as an anonymous module.
		define([], factory);
	} else if (typeof exports === 'object') {
		// Node. Does not work with strict CommonJS, but
		// only CommonJS-like environments that support module.exports,
		// like Node.
		module.exports = factory();
	} else {
		// Browser globals (root is window)
		root.download = factory();
  }
}(this, function () {

	window.download = function(data, strFileName, strMimeType) {

		var self = window, // this script is only for browsers anyway...
			defaultMime = "application/octet-stream", // this default mime also triggers iframe downloads
			mimeType = strMimeType || defaultMime,
			payload = data,
			url = !strFileName && !strMimeType && payload,
			anchor = document.createElement("a"),
			toString = function(a){return String(a);},
			myBlob = (self.Blob || self.MozBlob || self.WebKitBlob || toString),
			fileName = strFileName || "download",
			blob,
			reader;
			myBlob= myBlob.call ? myBlob.bind(self) : Blob ;

		if(String(this)==="true"){ //reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback
			payload=[payload, mimeType];
			mimeType=payload[0];
			payload=payload[1];
		}


		if(url && url.length< 2048){ // if no filename and no mime, assume a url was passed as the only argument
			fileName = url.split("/").pop().split("?")[0];
			anchor.href = url; // assign href prop to temp anchor
		  	if(anchor.href.indexOf(url) !== -1){ // if the browser determines that it's a potentially valid url path:
        		var ajax=new XMLHttpRequest();
        		ajax.open( "GET", url, true);
        		ajax.responseType = 'blob';
        		ajax.onload= function(e){
				  download(e.target.response, fileName, defaultMime);
				};
        		setTimeout(function(){ ajax.send();}, 0); // allows setting custom ajax headers using the return:
			    return ajax;
			} // end if valid url?
		} // end if url?


		//go ahead and download dataURLs right away
		if(/^data\:[\w+\-]+\/[\w+\-]+[,;]/.test(payload)){

			if(payload.length > (1024*1024*1.999) && myBlob !== toString ){
				payload=dataUrlToBlob(payload);
				mimeType=payload.type || defaultMime;
			}else{
				return navigator.msSaveBlob ?  // IE10 can't do a[download], only Blobs:
					navigator.msSaveBlob(dataUrlToBlob(payload), fileName) :
					saver(payload) ; // everyone else can save dataURLs un-processed
			}

		}//end if dataURL passed?

		blob = payload instanceof myBlob ?
			payload :
			new myBlob([payload], {type: mimeType}) ;


		function dataUrlToBlob(strUrl) {
			var parts= strUrl.split(/[:;,]/),
			type= parts[1],
			decoder= parts[2] == "base64" ? atob : decodeURIComponent,
			binData= decoder( parts.pop() ),
			mx= binData.length,
			i= 0,
			uiArr= new Uint8Array(mx);

			for(i;i<mx;++i) uiArr[i]= binData.charCodeAt(i);

			return new myBlob([uiArr], {type: type});
		 }

		function saver(url, winMode){

			if ('download' in anchor) { //html5 A[download]
				anchor.href = url;
				anchor.setAttribute("download", fileName);
				anchor.className = "download-js-link";
				anchor.innerHTML = "downloading...";
				anchor.style.display = "none";
				document.body.appendChild(anchor);
				setTimeout(function() {
					anchor.click();
					document.body.removeChild(anchor);
					if(winMode===true){setTimeout(function(){ self.URL.revokeObjectURL(anchor.href);}, 250 );}
				}, 66);
				return true;
			}

			// handle non-a[download] safari as best we can:
			if(/(Version)\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari\//.test(navigator.userAgent)) {
				url=url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
				if(!window.open(url)){ // popup blocked, offer direct download:
					if(confirm("Displaying New Document\n\nUse Save As... to download, then click back to return to this page.")){ location.href=url; }
				}
				return true;
			}

			//do iframe dataURL download (old ch+FF):
			var f = document.createElement("iframe");
			document.body.appendChild(f);

			if(!winMode){ // force a mime that will download:
				url="data:"+url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
			}
			f.src=url;
			setTimeout(function(){ document.body.removeChild(f); }, 333);

		}//end saver




		if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL)
			return navigator.msSaveBlob(blob, fileName);
		}

		if(self.URL){ // simple fast and modern way using Blob and URL:
			saver(self.URL.createObjectURL(blob), true);
		}else{
			// handle non-Blob()+non-URL browsers:
			if(typeof blob === "string" || blob.constructor===toString ){
				try{
					return saver( "data:" +  mimeType   + ";base64,"  +  self.btoa(blob)  );
				}catch(y){
					return saver( "data:" +  mimeType   + "," + encodeURIComponent(blob)  );
				}
			}

			// Blob but not URL support:
			reader=new FileReader();
			reader.onload=function(e){
				saver(this.result);
			};
			reader.readAsDataURL(blob);
		}
		return true;
	}; /* end download() */
}));

var loadjsPDF = document.createElement('script');
    loadjsPDF.src = 'https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.3.0/jspdf.umd.min.js';
    loadjsPDF.type = 'text/javascript';
    document.getElementsByTagName('head')[0].appendChild(loadjsPDF);

var jsZIP = document.createElement('script');
    jsZIP.src = 'https://cdnjs.cloudflare.com/ajax/libs/jszip/3.5.0/jszip.js';
    jsZIP.type = 'text/javascript';
    document.getElementsByTagName('head')[0].appendChild(jsZIP);

var fileSaver = document.createElement('script');
    fileSaver.src = 'https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/2.0.0/FileSaver.js';
    fileSaver.type = 'text/javascript';
    document.getElementsByTagName('head')[0].appendChild(fileSaver);


(function() {
    var $ = window.$;

    let btn = `<button id="download-pngs" style="position:fixed; bottom:1rem;left:1rem;z-index:99999;">Download As PNGs</button>`,
        form = `
             <form id="download-pdf" style="position:fixed;bottom:3rem;left:1rem;z-index:99999;padding:3px;border:1px solid black;background:white;">
                 <section style="margin:1rem 0rem;">
                     <input type="radio" id="paper-size-raw" name="paper-size" value="raw" required checked>
                     <label for="paper-size-a4">原始比例</label>
                     <input type="radio" id="paper-size-a4" name="paper-size" value="a4" required>
                     <label for="paper-size-a4">A4 大小</label>
                 </section>
                 <button type="submit">
                     download as PDF
                 </button>
             </form>
        `;

    $('body').append(btn).append(form);


    $(`#download-pngs`).click(() => {
        document.getElementById("download-pngs").disabled = true;
        let zip = new window.JSZip();
        $('canvas[id^="page_"]').each((index, page) => {
            zip.file(`${index.toString()}.png`, page.toDataURL(),{binary: true});
        });
        zip.generateAsync({type:"blob"})
            .then((content) => {
                window.saveAs(content, "pngs.zip");
                document.getElementById("download-pngs").disabled = false;
            });
    });

    $(`#download-pdf`).submit((e) => {
        e.preventDefault();
        if(confirm(`请确认你已将文章所有的页面都加载出来了！`)){
            let is_ask_for_raw_proportion = $(`#paper-size-raw`).is(':checked'),
                orientation = $('#page_1').width() > $('#page_1').height() ? 'l' : 'p',
                { jsPDF } = window.jspdf;

            let doc = is_ask_for_raw_proportion ?
                new jsPDF(orientation, 'mm', [$('#page_1').attr('height'), $('#page_1').attr('width')]) :
                new jsPDF(orientation, 'mm', 'a4');

            let width = doc.internal.pageSize.getWidth(),
                height = doc.internal.pageSize.getHeight();
            $('[id^="page_"]').each((index, page) => {
                doc.addImage(page.toDataURL(), 'JPEG', 0, 0, width, height);
                if (index !== ($('[id^="page_"]').length - 1)) {
                    doc.addPage();
                }
            });
            doc.save(`${$('title').text()}.pdf`);

        }
    });
})();