function download(filename, text) {
  let element = document.createElement('a');
  element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
  element.setAttribute('download', filename);

  element.style.display = 'none';
  document.body.appendChild(element);

  element.click();

  document.body.removeChild(element);
}

async function getChapter(chapterUrl){
	let chapterDownload = await fetch(chapterUrl, {
		"headers": {
			"sec-ch-ua": "\"Chromium\";v=\"88\", \"Google Chrome\";v=\"88\", \";Not A Brand\";v=\"99\"",
			"sec-ch-ua-mobile": "?0",
			"upgrade-insecure-requests": "1"
		},
		"referrer": "https://fastnovel.net/nanomancer-reborn-ive-become-a-snow-girl2-156/",
		"referrerPolicy": "strict-origin-when-cross-origin",
		"body": null,
		"method": "GET",
		"mode": "cors",
		"credentials": "omit"
	});

	if (chapterDownload.ok) {
		let response = await chapterDownload.text();
		document.open();
		document.write(response);
		document.close()

		let title = document.querySelector("h1.episode-name");
		let matched = title.textContent.match(/(Chapter.*)/g);
		title.innerHTML = matched[0];
		let content = document.querySelector("div#chapter-body");
		content.prepend(title);
		content.innerHTML = content.innerHTML.replaceAll("…","...").replace(/Find authorized novels.*for visiting/g, "").replace(/([A-z])\.([A-z])/g, function (match, p1, p2, offset, string){return p1+p2;}).replace(/([A-z])\.([A-z])/g, function (match, p1, p2, offset, string){return p1+p2;});

		return content.innerHTML;
	}
}


// Start file download.
//download("hello.txt","This is the content of my file :)");
async function main()
{
	let volumeLinks = ["", []]
	let chapters = document.querySelectorAll("div.book ul a");
	let volumes = [[]];
	let perVolume = 100;
	let title = document.querySelector("h1.name").textContent;
	let author = document.querySelector("ul.meta-data>li a").textContent;

	console.log(chapters.length / perVolume + 1);

	for(vol = 0; vol < Math.ceil(chapters.length/perVolume); vol++)
	{
		let chapterLinks = [];

		for(chap = 0; chap < perVolume && vol * perVolume + chap < chapters.length; chap++)
		{
			let chapIndex = vol * perVolume + chap;
			chapterLinks[chapters[chapIndex].text] = chapters[chapIndex].href;
		}

		volumeLinks[vol] = ["Volume " + (vol + 1), chapterLinks];
	}

	//console.log(volumeLinks);

	for (volume in volumeLinks) {
		//if(volumeLinks[volume][0] == "Volume 10")
		//{
		let toDownload = ""

		for (link in volumeLinks[volume][1]) {
			//console.log(link)
			if (volumeLinks[volume][1][link] != undefined) {
				//console.log(volumeLinks[volume][1][link])
				toDownload += await getChapter(volumeLinks[volume][1][link]);
			}
			//console.log(download)
		}

		let volumeName = volumeLinks[volume][0].replaceAll(": "," ").replaceAll(":","").replaceAll(" - "," ").replace(/Volume (\d)\b/,"Volume 0$1");
		download(title + " - " + volumeName + " - " + author + ".html", toDownload)
		//}
	}
}

main();