// ==UserScript==
// @name         [RED] Cover Inspector
// @namespace    https://greasyfork.org/users/321857-anakunda
// @version      1.10.1
// @run-at       document-end
// @description  Adds cover sticker if needs updating for unsupported host / big size / small resolution
// @author       Anakunda
// @copyright    2020, Anakunda (https://greasyfork.org/users/321857-anakunda)
// @license      GPL-3.0-or-later
// @match        https://redacted.ch/torrents.php?id=*
// @match        https://redacted.ch/artist.php?id=*
// @connect      *
// @grant        GM_xmlhttpRequest
// @grant        GM_getValue
// @grant        GM_setValue
// @require      https://openuserjs.org/src/libs/Anakunda/libLocks.min.js
// @require      https://openuserjs.org/src/libs/Anakunda/gazelleApiLib.min.js
// @downloadURL none
// ==/UserScript==

const httpParser = /^(https?:\/\/.+)*$/i;
const preferredHosts = ['https://ptpimg.me/'];

function getRemoteFileSize(url, forced = true) {
	return httpParser.test(url) ? new Promise(function(resolve, reject) {
		let size, abort = GM_xmlhttpRequest({ method: forced ? 'GET' : 'HEAD', url: url, //responseType: 'blob',
		 onreadystatechange: function(response) {
			 if (size >= 0 || response.readyState < XMLHttpRequest.HEADERS_RECEIVED) return;
			 if (/^(?:Content-Length)\s*:\s*(\d+)\b/im.test(response.responseHeaders) && (size = parseInt(RegExp.$1)) >= 0)
				 resolve(size);
			 else if (!forced) reject(undefined); else return;
			 abort.abort();
		 },
		 onload: function(response) { // fail-safe
			 if (size >= 0) return;
			 if (response.status < 200 || response.status >= 400) return reject('File not accessible');
			 //console.debug('responseText.length:', response.responseText.length);
			 resolve(response.responseText.length);
			 // console.time('GM_xmlhttpRequest response size getter');
			 // size = response.response.size; // response.responseText.length;
			 // console.timeEnd('GM_xmlhttpRequest response size getter');
			 // console.debug('response.size:', size);
			 // resolve(size);
		 },
		 onerror: response => { reject('File not accessible') },
		 ontimeout: response => { reject('File not accessible') },
		});
	}) : Promise.reject('getRemoteFileSize: parameter not valid URL');
}

function formattedSize(size) {
  return size >= 0 ? size < 1024**1 ? Math.round(size) + ' B'
		: size < 1024**2 ? (Math.round(size * 10 / 2**10) / 10) + ' KiB'
		: size < 1024**3 ? (Math.round(size * 100 / 2**20) / 100) + ' MiB'
		: size < 1024**4 ? (Math.round(size * 100 / 2**30) / 100) + ' GiB'
		: size < 1024**5 ? (Math.round(size * 100 / 2**40) / 100) + ' TiB'
		: (Math.round(size * 100 / 2**50) / 100) + ' PiB' : NaN;
}

const id = parseInt(new URLSearchParams(document.location.search).get('id'));

const rehostImageLinks = ajaxApiKey && document.location.pathname == '/torrents.php' ? (function() {
	const input = document.head.querySelector('meta[name="ImageHostHelper"]');
	return (input != null ? Promise.resolve(input) : new Promise(function(resolve, reject) {
		const mo = new MutationObserver(function(mutationsList, mo) {
			for (let mutation of mutationsList) for (let node of mutation.addedNodes) {
				if (node.nodeName != 'META' || node.name != 'ImageHostHelper') continue;
				clearTimeout(timer); mo.disconnect();
				return resolve(node);
			}
		}), timer = setTimeout(function(mo) {
			mo.disconnect();
			reject('Timeout reached');
		}, 10000, mo);
		mo.observe(document.head, { childList: true });
	})).then(function(meta) {
		console.assert(typeof unsafeWindow.rehostImageLinks == 'function', "typeof unsafeWindow.rehostImageLinks == 'function'");
		return (typeof unsafeWindow.rehostImageLinks == 'function') ? unsafeWindow.rehostImageLinks
			: Promise.reject('rehostImageLinks not accessible'); // assertion failed!
	});
})() : Promise.reject('AJAX API key not configured or unsupported page');

let acceptableCoverSize = GM_getValue('acceptable_cover_size');
if (!(acceptableCoverSize >= 0)) GM_setValue('acceptable_cover_size', acceptableCoverSize = 2048);
let acceptableCoverResolution = GM_getValue('acceptable_cover_resolution');
if (!(acceptableCoverResolution >= 0)) GM_setValue('acceptable_cover_resolution', acceptableCoverResolution = 300);

function inspectImage(img) {
	console.assert(img instanceof HTMLImageElement, 'img instanceof HTMLImageElement');
	if (!(img instanceof HTMLImageElement)) return;
	let imgSrc = img.dataset.gazelleTempSrc || img.src;
	if (imgSrc.startsWith(document.location.origin) && imgSrc.includes('/static/common/noartwork/')) return;
	if (typeof img.onclick == 'function' && /\b(?:lightbox\.init)\('(.+?)'/.test(img.onclick.toSource())) imgSrc = RegExp.$1
		else if (imgSrc.startsWith('https://i.imgur.com/')) imgSrc = imgSrc.replace(/\/(\w{7,})m\.(\w+)$/, '/$1.$2');
	console.debug('imgSrc:', imgSrc);
	img.parentNode.style.position = 'relative';
	const _img = document.createElement('img');
	(function imageHandler(imgUrl) {
		const span = (content, isOK = false) => (isOK ? '<span>' : '<span style="color: yellow;">') + content + '</span>',
					sticker = document.createElement('div');
		sticker.className = 'cover-inspector';
		sticker.style = `
position: absolute; right: 4px; bottom: 4px;
color: white; background-color: #ae2300; border: 1px solid whitesmoke;
font: 700 8pt "Segoe UI"; padding: 1px 5px; cursor:default; z-index: 10;
		`;
		// if (img.width < 200 || img.height < 200) {
		// 	sticker.style.fontSize = '4.2pt';
		// 	sticker.style.textAlign = 'center';
		// 	sticker.style.padding = '1px 2px';
		// 	sticker.style.right = '1px';
		// 	sticker.style.bottom = '1px';
		// }
		Promise.all([
			new Promise(function(resolve, reject) {
				_img.src = imgUrl;
				_img.onload = evt => { resolve(evt.currentTarget) };
				_img.onerror = evt => { reject(evt.message) };
			}),
			getRemoteFileSize(imgUrl).catch(function(reason) {
				console.warn('Failed to get remote image size (' + imgUrl + '):', reason);
				return undefined;
			}),
		]).then(function(results) {
			if (results[0].naturalWidth <= 0 || results[0].naturalHeight <= 0
					|| results[1] < 2 * 2**10 && results[0].naturalWidth == 400 && results[0].naturalHeight == 100
					|| results[1] == 503) return Promise.reject('Image is invalid');
			const isProxied = imgUrl.startsWith(document.location.origin + '/image.php?'),
						isPreferredHost = preferredHosts.some(preferredHost => imgUrl.startsWith(preferredHost)),
						isSizeOK = acceptableCoverSize == 0 || results[1] <= acceptableCoverSize * 2**10,
						isResolutionOK = acceptableCoverResolution == 0
			|| (results[0].naturalWidth >= acceptableCoverResolution
					&& results[0].naturalHeight >= acceptableCoverResolution);
			if (isPreferredHost && isSizeOK && isResolutionOK) return true;
			sticker.style.opacity = 0.8;
			sticker.innerHTML = span(formattedSize(results[1]), isSizeOK) + ' / ' +
				span(results[0].naturalWidth + '×' + results[0].naturalHeight, isResolutionOK);
			if (isProxied) sticker.innerHTML = span('PROXY') + ' / ' + sticker.innerHTML;
				else if (!isPreferredHost) sticker.innerHTML = span('XTRN') + ' / ' + sticker.innerHTML;
			if (!isPreferredHost && id) rehostImageLinks.then(function(rehostImageLinks) {
				sticker.style.cursor = 'pointer';
				sticker.title = 'Click to rehost to preferred image host';
				sticker.onclick = function(evt) {
					if (evt.currentTarget.disabled) return false;
					sticker.disabled = true;
					img.style.opacity = 0.5;
					rehostImageLinks([imgUrl], true).then(rehostedImages => queryAjaxAPI('groupedit', { id: id }, new URLSearchParams({
						image: rehostedImages[0],
						summary: 'Image update/rehost',
					})).then(function(response) {
						console.log(rehostedImages[0], response);
						sticker.remove();
						Promise.resolve(img.src = rehostedImages[0]).then(imageHandler);
					})).catch(unsafeWindow.ihhLogFail).then(function() {
						img.style.opacity = 1;
						sticker.disabled = false;
					});
				};
			});
			img.insertAdjacentElement('afterend', sticker);
			return false;
		}).catch(function(reason) {
			sticker.innerHTML = span('INVALID');
			img.insertAdjacentElement('afterend', sticker);
			img.remove();
		});
	})(imgSrc);
}
document.body.querySelectorAll([
	'div#covers p > img',
	'td > div.group_image > img',
	'div.box_image > div > img',
].join(', ')).forEach(inspectImage);

if (id) rehostImageLinks.then(function(rehostImageLinks) {
	function setCoverFromLink(a) {
		console.assert(a instanceof HTMLAnchorElement, 'a instanceof HTMLAnchorElement');
		if (!(a instanceof HTMLAnchorElement)) throw 'Invalid invoker';
		rehostImageLinks([a.href], true).then(rehostedImages => queryAjaxAPI('groupedit', { id: id }, new URLSearchParams({
			image: rehostedImages[0],
			summary: 'Image update/rehost',
		})).then(function(response) {
			console.log(rehostedImages[0], response);
			document.location.reload();
		})).catch(unsafeWindow.ihhLogFail);
	}

	const contextId = '522a6889-27d6-4ea6-a878-20dec4362fbd', menu = document.createElement('menu');
	menu.type = 'context';
	menu.id = contextId;
	menu.className = 'cover-inspector';
	let menuInvoker;
	const setMenuInvoker = evt => { menuInvoker = evt.currentTarget };

	function addMenuItem(label, callback) {
		if (label) {
			const menuItem = document.createElement('MENUITEM');
			menuItem.label = label;
			if (typeof callback == 'function') menuItem.onclick = callback;
			menu.append(menuItem);
		}
		return menu.children.length;
	}

	addMenuItem('Set cover image from this link', evt => { setCoverFromLink(menuInvoker) });
	document.body.append(menu);

	function clickHandler(evt) {
		if (!evt.altKey) return true;
		evt.preventDefault();
		if (confirm('Set torrent group cover from this link?')) setCoverFromLink(evt.currentTarget);
		return false;
	}

	function setAnchorHandlers(a) {
		console.assert(a instanceof HTMLAnchorElement, 'a instanceof HTMLAnchorElement');
		if (!(a instanceof HTMLAnchorElement)) return false;
		a.setAttribute('contextmenu', contextId);
		a.oncontextmenu = setMenuInvoker;
		a.onclick = clickHandler;
		a.title = 'Alt + click to set torrent image from this URL (or use context menu command)';
		return true;
	}

	document.body.querySelectorAll([
		'div.torrent_description > div.body a',
		'table#torrent_details > tbody > tr.torrentdetails > td > blockquote a',
	].join(', ')).forEach(setAnchorHandlers);
});