1const BS_COL_WIDTH = 4,
  2	MAX_WIDTH = MAX_HEIGHT = 1000,
  3	WATERMARK_SRC = "/static/res/wm.png",
  4	WATERMARK_WIDTH = 325,
  5	WATERMARK_HEIGHT = 98,
  6	IG_TEMPLATE_SRC = "/static/res/ig.png",
  7	IG_MIN_OFFSET_X = 0,
  8	IG_MIN_OFFSET_Y = 342,
  9	IG_MAX_WIDTH = 1080,
 10	IG_MAX_HEIGHT = 988,
 11
 12	WATERMARK = new Image(),
 13	IG_TEMPLATE = new Image(),
 14	date = new Date(),
 15	month_input = document.getElementById("month_input"),
 16	month_div = document.getElementById("month_div"),
 17	get_button = document.getElementById("get_button"),
 18	selectall_button = document.getElementById("selectall_button"),
 19	selectnone_button = document.getElementById("selectnone_button"),
 20	togglecolor_button = document.getElementById("togglecolor_button"),
 21	controls_div = document.getElementById("controls"),
 22	opacity_range = document.getElementById("opacity_range"),
 23	main_container_div = document.getElementById("main_container"),
 24	content_div = document.getElementById("content"),
 25	canvas_link = document.getElementById("canvas-download"),
 26	canvas_ig = document.getElementById("instagram-canvas"),
 27	fanart_template = document.getElementById("fanart-template").innerHTML;
 28
 29let fanarts = new Array(),
 30	watermark_invert = '';
 31
 32WATERMARK.src = WATERMARK_SRC;
 33IG_TEMPLATE.src = IG_TEMPLATE_SRC;
 34month_input.value = `${date.getFullYear()}-${("0" + (date.getMonth() + 1)).slice(-2)}`;
 35
 36function addCanvasEvents(element, ctx) {
 37	function abc(e) {
 38		if (element.enabled == 0) return;
 39		if (e.button == 0) {
 40			if (e.type == "mousedown") {
 41				element.clicked = true;
 42				console.log(element);
 43			}
 44			element.watermark = {
 45				x: undefined,
 46				y: undefined,
 47				opacity: opacity_range.value,
 48				invert: watermark_invert
 49			}
 50			addWatermark(e, element, ctx);
 51		}
 52	}
 53
 54	if (element.clicked) {
 55		element.canvas.addEventListener('mousedown', abc);
 56		return;
 57	}
 58	element.canvas.addEventListener('mousemove', abc);
 59	element.canvas.addEventListener('mouseleave', () => {
 60		if (!element.clicked && element.enabled)
 61			setBaseImage(element.image, element.canvas, ctx);
 62	});
 63	element.canvas.addEventListener('mousedown', (e) => {
 64		abc(e);
 65		element.canvas.removeEventListener('mousemove', abc);
 66		element.canvas.addEventListener('mousedown', abc);
 67	});
 68}
 69
 70function createElementFromHTML(htmlString) {
 71	const div = document.createElement('div');
 72	div.innerHTML = htmlString.trim();
 73	return div.firstChild;
 74}
 75
 76function getNewCardHtml(element) {
 77
 78	const id = element.id,
 79		index = element.index,
 80		name = element.name,
 81		content = element.content,
 82		filename = `${('0' + element.index).slice(-2)} - ${element.name}.png`,
 83		disabled = element.enabled == 0 ? " entry-disabled" : "";
 84
 85	const html_string = Mustache.render("{{={| |}=}}" + fanart_template, { id, index, name, content, filename, disabled });
 86	element.div = createElementFromHTML(html_string);
 87	element.canvas = element.div.getElementsByTagName("canvas")[0];
 88
 89	const ctx = element.canvas.getContext("2d");
 90
 91	element.image = new Image();
 92	element.image.addEventListener("load", () => {
 93		const wm_info = element.watermark;
 94		setBaseImage(element.image, element.canvas, ctx);
 95		if (element.clicked) {
 96			drawWatermark(wm_info, ctx);
 97		}
 98		addCanvasEvents(element, ctx);
 99	});
100	element.image.src = element.content;
101
102	return element.div;
103}
104
105async function updateFanartList() {
106	main_container_div.hidden = false;
107	content_div.innerHTML = "";
108	get_button.disabled = false;
109	get_button.innerText = "Aggiungi";
110
111	let i = 0;
112	for (fanart of fanarts) {
113		if (fanart.enabled) {
114			i++;
115			fanart.index = i;
116			content_div.appendChild(getNewCardHtml(fanart));
117		}
118	}
119
120	for (fanart of fanarts) {
121		if (!fanart.enabled) {
122			fanart.index = 0;
123			content_div.appendChild(getNewCardHtml(fanart));
124		}
125	}
126}
127
128function getFanart(id) {
129	return fanarts.find(element => element.id == id)
130}
131
132function toggleEntry(id) {
133	entry = getFanart(id);
134	if (!entry) return;
135
136	entry.enabled = !entry.enabled;
137	updateFanartList()
138}
139
140function saveCanvas(my_canvas, filename) {
141	canvas_link.href = my_canvas.toDataURL("image/png").replace("image/png", "image/octet-stream");
142	canvas_link.setAttribute("download", filename);
143	canvas_link.click()
144}
145
146function reloadEntry(id) {
147	const fanart = getFanart(id);
148	if (!fanart) return;
149
150	const old_div = fanart.div;
151	content_div.replaceChild(getNewCardHtml(fanart), old_div);
152	old_div.remove();
153}
154
155function selectAllNone(toggle) {
156	fanarts.map(x => x.enabled = toggle)
157	updateFanartList()
158}
159
160function debugFn() {
161	fanarts = JSON.parse('[{"id":"1dE8L7w2DuOfQSJwf5oRjAeJ-VZfy5o-6","date":["03","08","2022"],"name":"Saro","content":"/static/res/wm.png","enabled":1,"index":1,"div":{}},{"id":"1ZO2poqaylmh7_FkEjRthozVXFpcP1Edx","date":["18","08","2022"],"name":"suchetto","content":"https://drive.google.com/uc?id=1ZO2poqaylmh7_FkEjRthozVXFpcP1Edx","enabled":1,"index":2,"div":{}},{"id":"1jkpZzqnQUdXv7QiW1khuwnSsdnjudBt-","date":["18","08","2022"],"name":"suca","content":"https://drive.google.com/uc?id=1clZbi1QzJQo_c7PGWx-nmLgfPhXqHdZR","enabled":1,"index":3,"div":{}}]');
162	controls_div.hidden = false;
163	updateOpacity();
164	updateFanartList();
165}
166
167function toggleColor() {
168	watermark_invert = watermark_invert == '' ? 'invert(1)' : '';
169	updateColorDisplay();
170}
171
172function updateColorDisplay() {
173	togglecolor_button.innerText = watermark_invert ? "⚫" : "⚪";
174}
175
176function clickCoordsToCanvas(clickX, clickY, c) {
177	const rect = c.getBoundingClientRect();
178	const x = (clickX - rect.left) * c.width / c.clientWidth;
179	const y = (clickY - rect.top) * c.height / c.clientHeight;
180	return [x, y];
181}
182
183function drawWatermark(wm_info, ctx) {
184	ctx.globalAlpha = wm_info.opacity;
185	ctx.filter = wm_info.invert;
186	ctx.drawImage(WATERMARK, wm_info.x - (WATERMARK_WIDTH / 2), wm_info.y - (WATERMARK_HEIGHT / 2), WATERMARK_WIDTH, WATERMARK_HEIGHT);
187}
188
189function addWatermark(event, element, ctx) {
190	setBaseImage(element.image, element.canvas, ctx);
191	const [x, y] = clickCoordsToCanvas(event.clientX, event.clientY, element.canvas);
192	element.watermark.x = x;
193	element.watermark.y = y
194	drawWatermark(element.watermark, ctx);
195}
196
197function updateOpacity() {
198	opacity_label.innerHTML = Math.round(opacity_range.value * 100) + '%';
199}
200
201function getFactor(img_width, img_height, max_width, max_height) {
202	return Math.min(max_width / img_width, max_height / img_height);
203}
204
205function setBaseImage(img, c, ctx) {
206	const f = getFactor(img.width, img.height, MAX_WIDTH, MAX_HEIGHT);
207
208	const new_width = c.width = Math.ceil(img.width * f);
209	const new_height = c.height = Math.ceil(img.height * f)
210
211	ctx.imageSmoothingEnabled = (f < 1);
212	ctx.drawImage(img, 0, 0, new_width, new_height);
213}
214
215function moveUpDown(id, amount) {
216	const pos = fanarts.indexOf(fanarts.find(element => element.id == id));
217	const new_pos = pos + amount;
218
219	if (new_pos <= -1 || new_pos >= fanarts.length) {
220		return;
221	}
222
223	[fanarts[pos], fanarts[new_pos]] = [fanarts[new_pos], fanarts[pos]];
224
225	updateFanartList();
226}
227
228async function postData(url = "", data = {}, contentType = "application/json") {
229	const response = await fetch(url, { method: "POST", headers: { "Content-Type": contentType }, body: JSON.stringify(data) });
230	return response.json();
231}
232
233function saveEntry(id) {
234	entry = getFanart(id);
235	if (!entry) return;
236	saveCanvas(entry.canvas, entry.canvas.getAttribute("data-filename"));
237}
238
239function saveCanvasIG(my_canvas) {
240	const f = getFactor(my_canvas.width, my_canvas.height, IG_MAX_WIDTH, IG_MAX_HEIGHT);
241
242	const width = Math.ceil(my_canvas.width * f);
243	const height = Math.ceil(my_canvas.height * f);
244
245	const offset_x = Math.round((IG_MAX_WIDTH - width) / 2);
246	const offset_y = Math.round((IG_MAX_HEIGHT - height) / 2);
247
248	destCtx = canvas_ig.getContext('2d');
249	destCtx.drawImage(IG_TEMPLATE, 0, 0);
250	destCtx.drawImage(my_canvas, IG_MIN_OFFSET_X + offset_x, IG_MIN_OFFSET_Y + offset_y, width, height);
251	saveCanvas(canvas_ig, "IG - " + my_canvas.getAttribute("data-filename"));
252}
253
254function saveEntryIG(id) {
255	entry = getFanart(id);
256	if (!entry) return;
257	saveCanvasIG(entry.canvas);
258}
259
260function getArtworks() {
261	get_button.disabled = true;
262	get_button.innerText = "…"
263	postData("/", { month: month_input.value }).then((data) => {
264		//console.log(data);
265		fanarts = fanarts.concat(data);
266		controls_div.hidden = false;
267		updateOpacity();
268		updateFanartList();
269	});
270}
271
272function saveAll() {
273	const response = confirm("Vuoi davvero scaricare tutte le fanart?");
274	if (response == false) return;
275
276	fanarts.forEach((fanart) => {
277		if (fanart.enabled)
278			saveCanvas(fanart.canvas, fanart.canvas.getAttribute("data-filename"));
279	})
280}
281
282function saveAllIG() {
283	const response = confirm("Vuoi davvero scaricare tutte le storie per le fanart?");
284	if (response == false) return;
285
286	fanarts.forEach((fanart) => {
287		if (fanart.enabled)
288			saveCanvasIG(fanart.canvas);
289	});
290}