app.js

import { ComfyLogging } from "./logging.js";
import { ComfyWidgets } from "./widgets.js";
import { ComfyUI, $el } from "./ui.js";
import { api } from "./api.js";
import { defaultGraph } from "./defaultGraph.js";
import { getPngMetadata, getWebpMetadata, importA1111, getLatentMetadata } from "./pnginfo.js";


function sanitizeNodeName(string) {
	let entityMap = {
	'&': '',
	'<': '',
	'>': '',
	'"': '',
	"'": '',
	'`': '',
	'=': ''
	};
	return String(string).replace(/[&<>"'`=\/]/g, function fromEntityMap (s) {
		return entityMap[s];
	});
}

/**
 * @typedef {import("types/comfy").ComfyExtension} ComfyExtension
 */

export class ComfyApp {
	/**
	 * List of entries to queue
	 * @type {{number: number, batchCount: number}[]}
	 */
	#queueItems = [];
	/**
	 * If the queue is currently being processed
	 * @type {boolean}
	 */
	#processingQueue = false;

	/**
	 * Content Clipboard
	 * @type {serialized node object}
	 */
	static clipspace = null;
	static clipspace_invalidate_handler = null;
	static open_maskeditor = null;
	static clipspace_return_node = null;

	constructor() {
		this.ui = new ComfyUI(this);
		this.logging = new ComfyLogging(this);

		/**
		 * List of extensions that are registered with the app
		 * @type {ComfyExtension[]}
		 */
		this.extensions = [];

		/**
		 * Stores the execution output data for each node
		 * @type {Record<string, any>}
		 */
		this.nodeOutputs = {};

		/**
		 * Stores the preview image data for each node
		 * @type {Record<string, Image>}
		 */
		this.nodePreviewImages = {};

		/**
		 * If the shift key on the keyboard is pressed
		 * @type {boolean}
		 */
		this.shiftDown = false;
	}

	getPreviewFormatParam() {
		let preview_format = this.ui.settings.getSettingValue("Comfy.PreviewFormat");
		if(preview_format)
			return `&preview=${preview_format}`;
		else
			return "";
	}

	static isImageNode(node) {
		return node.imgs || (node && node.widgets && node.widgets.findIndex(obj => obj.name === 'image') >= 0);
	}

	static onClipspaceEditorSave() {
		if(ComfyApp.clipspace_return_node) {
			ComfyApp.pasteFromClipspace(ComfyApp.clipspace_return_node);
		}
	}

	static onClipspaceEditorClosed() {
		ComfyApp.clipspace_return_node = null;
	}

	static copyToClipspace(node) {
		var widgets = null;
		if(node.widgets) {
			widgets = node.widgets.map(({ type, name, value }) => ({ type, name, value }));
		}

		var imgs = undefined;
		var orig_imgs = undefined;
		if(node.imgs != undefined) {
			imgs = [];
			orig_imgs = [];

			for (let i = 0; i < node.imgs.length; i++) {
				imgs[i] = new Image();
				imgs[i].src = node.imgs[i].src;
				orig_imgs[i] = imgs[i];
			}
		}

		var selectedIndex = 0;
		if(node.imageIndex) {
			selectedIndex = node.imageIndex;
		}

		ComfyApp.clipspace = {
			'widgets': widgets,
			'imgs': imgs,
			'original_imgs': orig_imgs,
			'images': node.images,
			'selectedIndex': selectedIndex,
			'img_paste_mode': 'selected' // reset to default im_paste_mode state on copy action
		};

		ComfyApp.clipspace_return_node = null;

		if(ComfyApp.clipspace_invalidate_handler) {
			ComfyApp.clipspace_invalidate_handler();
		}
	}

	static pasteFromClipspace(node) {
		if(ComfyApp.clipspace) {
			// image paste
			if(ComfyApp.clipspace.imgs && node.imgs) {
				if(node.images && ComfyApp.clipspace.images) {
					if(ComfyApp.clipspace['img_paste_mode'] == 'selected') {
						node.images = [ComfyApp.clipspace.images[ComfyApp.clipspace['selectedIndex']]];
					}
					else {
						node.images = ComfyApp.clipspace.images;
					}

					if(app.nodeOutputs[node.id + ""])
						app.nodeOutputs[node.id + ""].images = node.images;
				}

				if(ComfyApp.clipspace.imgs) {
					// deep-copy to cut link with clipspace
					if(ComfyApp.clipspace['img_paste_mode'] == 'selected') {
						const img = new Image();
						img.src = ComfyApp.clipspace.imgs[ComfyApp.clipspace['selectedIndex']].src;
						node.imgs = [img];
						node.imageIndex = 0;
					}
					else {
						const imgs = [];
						for(let i=0; i<ComfyApp.clipspace.imgs.length; i++) {
							imgs[i] = new Image();
							imgs[i].src = ComfyApp.clipspace.imgs[i].src;
							node.imgs = imgs;
						}
					}
				}
			}

			if(node.widgets) {
				if(ComfyApp.clipspace.images) {
					const clip_image = ComfyApp.clipspace.images[ComfyApp.clipspace['selectedIndex']];
					const index = node.widgets.findIndex(obj => obj.name === 'image');
					if(index >= 0) {
						if(node.widgets[index].type != 'image' && typeof node.widgets[index].value == "string" && clip_image.filename) {
							node.widgets[index].value = (clip_image.subfolder?clip_image.subfolder+'/':'') + clip_image.filename + (clip_image.type?` [${clip_image.type}]`:'');
						}
						else {
							node.widgets[index].value = clip_image;
						}
					}
				}
				if(ComfyApp.clipspace.widgets) {
					ComfyApp.clipspace.widgets.forEach(({ type, name, value }) => {
						const prop = Object.values(node.widgets).find(obj => obj.type === type && obj.name === name);
						if (prop && prop.type != 'button') {
							if(prop.type != 'image' && typeof prop.value == "string" && value.filename) {
								prop.value = (value.subfolder?value.subfolder+'/':'') + value.filename + (value.type?` [${value.type}]`:'');
							}
							else {
								prop.value = value;
								prop.callback(value);
							}
						}
					});
				}
			}

			app.graph.setDirtyCanvas(true);
		}
	}

	/**
	 * Invoke an extension callback
	 * @param {keyof ComfyExtension} method The extension callback to execute
	 * @param  {any[]} args Any arguments to pass to the callback
	 * @returns
	 */
	#invokeExtensions(method, ...args) {
		let results = [];
		for (const ext of this.extensions) {
			if (method in ext) {
				try {
					results.push(ext[method](...args, this));
				} catch (error) {
					console.error(
						`Error calling extension '${ext.name}' method '${method}'`,
						{ error },
						{ extension: ext },
						{ args }
					);
				}
			}
		}
		return results;
	}

	/**
	 * Invoke an async extension callback
	 * Each callback will be invoked concurrently
	 * @param {string} method The extension callback to execute
	 * @param  {...any} args Any arguments to pass to the callback
	 * @returns
	 */
	async #invokeExtensionsAsync(method, ...args) {
		return await Promise.all(
			this.extensions.map(async (ext) => {
				if (method in ext) {
					try {
						return await ext[method](...args, this);
					} catch (error) {
						console.error(
							`Error calling extension '${ext.name}' method '${method}'`,
							{ error },
							{ extension: ext },
							{ args }
						);
					}
				}
			})
		);
	}

	/**
	 * Adds special context menu handling for nodes
	 * e.g. this adds Open Image functionality for nodes that show images
	 * @param {*} node The node to add the menu handler
	 */
	#addNodeContextMenuHandler(node) {
		node.prototype.getExtraMenuOptions = function (_, options) {
			if (this.imgs) {
				// If this node has images then we add an open in new tab item
				let img;
				if (this.imageIndex != null) {
					// An image is selected so select that
					img = this.imgs[this.imageIndex];
				} else if (this.overIndex != null) {
					// No image is selected but one is hovered
					img = this.imgs[this.overIndex];
				}
				if (img) {
					options.unshift(
						{
							content: "Open Image",
							callback: () => {
								let url = new URL(img.src);
								url.searchParams.delete('preview');
								window.open(url, "_blank")
							},
						},
						{
							content: "Save Image",
							callback: () => {
								const a = document.createElement("a");
								let url = new URL(img.src);
								url.searchParams.delete('preview');
								a.href = url;
								a.setAttribute("download", new URLSearchParams(url.search).get("filename"));
								document.body.append(a);
								a.click();
								requestAnimationFrame(() => a.remove());
							},
						}
					);
				}
			}

			options.push({
					content: "Bypass",
					callback: (obj) => { if (this.mode === 4) this.mode = 0; else this.mode = 4; this.graph.change(); }
				});

			// prevent conflict of clipspace content
			if(!ComfyApp.clipspace_return_node) {
				options.push({
						content: "Copy (Clipspace)",
						callback: (obj) => { ComfyApp.copyToClipspace(this); }
					});

				if(ComfyApp.clipspace != null) {
					options.push({
							content: "Paste (Clipspace)",
							callback: () => { ComfyApp.pasteFromClipspace(this); }
						});
				}

				if(ComfyApp.isImageNode(this)) {
					options.push({
							content: "Open in MaskEditor",
							callback: (obj) => {
								ComfyApp.copyToClipspace(this);
								ComfyApp.clipspace_return_node = this;
								ComfyApp.open_maskeditor();
							}
						});
				}
			}
		};
	}

	#addNodeKeyHandler(node) {
		const app = this;
		const origNodeOnKeyDown = node.prototype.onKeyDown;

		node.prototype.onKeyDown = function(e) {
			if (origNodeOnKeyDown && origNodeOnKeyDown.apply(this, e) === false) {
				return false;
			}

			if (this.flags.collapsed || !this.imgs || this.imageIndex === null) {
				return;
			}

			let handled = false;

			if (e.key === "ArrowLeft" || e.key === "ArrowRight") {
				if (e.key === "ArrowLeft") {
					this.imageIndex -= 1;
				} else if (e.key === "ArrowRight") {
					this.imageIndex += 1;
				}
				this.imageIndex %= this.imgs.length;

				if (this.imageIndex < 0) {
					this.imageIndex = this.imgs.length + this.imageIndex;
				}
				handled = true;
			} else if (e.key === "Escape") {
				this.imageIndex = null;
				handled = true;
			}

			if (handled === true) {
				e.preventDefault();
				e.stopImmediatePropagation();
				return false;
			}
		}
	}

	/**
	 * Adds Custom drawing logic for nodes
	 * e.g. Draws images and handles thumbnail navigation on nodes that output images
	 * @param {*} node The node to add the draw handler
	 */
	#addDrawBackgroundHandler(node) {
		const app = this;

		function getImageTop(node) {
			let shiftY;
			if (node.imageOffset != null) {
				shiftY = node.imageOffset;
			} else {
				if (node.widgets?.length) {
					const w = node.widgets[node.widgets.length - 1];
					shiftY = w.last_y;
					if (w.computeSize) {
						shiftY += w.computeSize()[1] + 4;
					}
					else if(w.computedHeight) {
						shiftY += w.computedHeight;
					}
					else {
						shiftY += LiteGraph.NODE_WIDGET_HEIGHT + 4;
					}
				} else {
					shiftY = node.computeSize()[1];
				}
			}
			return shiftY;
		}

		node.prototype.setSizeForImage = function () {
			if (this.inputHeight) {
				this.setSize(this.size);
				return;
			}
			const minHeight = getImageTop(this) + 220;
			if (this.size[1] < minHeight) {
				this.setSize([this.size[0], minHeight]);
			}
		};

		node.prototype.onDrawBackground = function (ctx) {
			if (!this.flags.collapsed) {
				let imgURLs = []
				let imagesChanged = false

				const output = app.nodeOutputs[this.id + ""];
				if (output && output.images) {
					if (this.images !== output.images) {
						this.images = output.images;
						imagesChanged = true;
						imgURLs = imgURLs.concat(output.images.map(params => {
							return api.apiURL("/view?" + new URLSearchParams(params).toString() + app.getPreviewFormatParam());
						}))
					}
				}

				const preview = app.nodePreviewImages[this.id + ""]
				if (this.preview !== preview) {
					this.preview = preview
					imagesChanged = true;
					if (preview != null) {
						imgURLs.push(preview);
					}
				}

				if (imagesChanged) {
					this.imageIndex = null;
					if (imgURLs.length > 0) {
						Promise.all(
							imgURLs.map((src) => {
								return new Promise((r) => {
									const img = new Image();
									img.onload = () => r(img);
									img.onerror = () => r(null);
									img.src = src
								});
							})
						).then((imgs) => {
							if ((!output || this.images === output.images) && (!preview || this.preview === preview)) {
								this.imgs = imgs.filter(Boolean);
								this.setSizeForImage?.();
								app.graph.setDirtyCanvas(true);
							}
						});
					}
					else {
						this.imgs = null;
					}
				}

				function calculateGrid(w, h, n) {
					let columns, rows, cellsize;

					if (w > h) {
						cellsize = h;
						columns = Math.ceil(w / cellsize);
						rows = Math.ceil(n / columns);
					} else {
						cellsize = w;
						rows = Math.ceil(h / cellsize);
						columns = Math.ceil(n / rows);
					}

					while (columns * rows < n) {
						cellsize++;
						if (w >= h) {
							columns = Math.ceil(w / cellsize);
							rows = Math.ceil(n / columns);
						} else {
							rows = Math.ceil(h / cellsize);
							columns = Math.ceil(n / rows);
						}
					}

					const cell_size = Math.min(w/columns, h/rows);
					return {cell_size, columns, rows};
				}

				function is_all_same_aspect_ratio(imgs) {
					// assume: imgs.length >= 2
					let ratio = imgs[0].naturalWidth/imgs[0].naturalHeight;

					for(let i=1; i<imgs.length; i++) {
						let this_ratio = imgs[i].naturalWidth/imgs[i].naturalHeight;
						if(ratio != this_ratio)
							return false;
					}

					return true;
				}

				if (this.imgs && this.imgs.length) {
					const canvas = app.graph.list_of_graphcanvas[0];
					const mouse = canvas.graph_mouse;
					if (!canvas.pointer_is_down && this.pointerDown) {
						if (mouse[0] === this.pointerDown.pos[0] && mouse[1] === this.pointerDown.pos[1]) {
							this.imageIndex = this.pointerDown.index;
						}
						this.pointerDown = null;
					}

					let imageIndex = this.imageIndex;
					const numImages = this.imgs.length;
					if (numImages === 1 && !imageIndex) {
						this.imageIndex = imageIndex = 0;
					}

					const top = getImageTop(this);
					var shiftY = top;

					let dw = this.size[0];
					let dh = this.size[1];
					dh -= shiftY;

					if (imageIndex == null) {
						var cellWidth, cellHeight, shiftX, cell_padding, cols;

						const compact_mode = is_all_same_aspect_ratio(this.imgs);
						if(!compact_mode) {
							// use rectangle cell style and border line
							cell_padding = 2;
							const { cell_size, columns, rows } = calculateGrid(dw, dh, numImages);
							cols = columns;

							cellWidth = cell_size;
							cellHeight = cell_size;
							shiftX = (dw-cell_size*cols)/2;
							shiftY = (dh-cell_size*rows)/2 + top;
						}
						else {
							cell_padding = 0;
							let best = 0;
							let w = this.imgs[0].naturalWidth;
							let h = this.imgs[0].naturalHeight;

							// compact style
							for (let c = 1; c <= numImages; c++) {
								const rows = Math.ceil(numImages / c);
								const cW = dw / c;
								const cH = dh / rows;
								const scaleX = cW / w;
								const scaleY = cH / h;

								const scale = Math.min(scaleX, scaleY, 1);
								const imageW = w * scale;
								const imageH = h * scale;
								const area = imageW * imageH * numImages;

								if (area > best) {
									best = area;
									cellWidth = imageW;
									cellHeight = imageH;
									cols = c;
									shiftX = c * ((cW - imageW) / 2);
								}
							}
						}

						let anyHovered = false;
						this.imageRects = [];
						for (let i = 0; i < numImages; i++) {
							const img = this.imgs[i];
							const row = Math.floor(i / cols);
							const col = i % cols;
							const x = col * cellWidth + shiftX;
							const y = row * cellHeight + shiftY;
							if (!anyHovered) {
								anyHovered = LiteGraph.isInsideRectangle(
									mouse[0],
									mouse[1],
									x + this.pos[0],
									y + this.pos[1],
									cellWidth,
									cellHeight
								);
								if (anyHovered) {
									this.overIndex = i;
									let value = 110;
									if (canvas.pointer_is_down) {
										if (!this.pointerDown || this.pointerDown.index !== i) {
											this.pointerDown = { index: i, pos: [...mouse] };
										}
										value = 125;
									}
									ctx.filter = `contrast(${value}%) brightness(${value}%)`;
									canvas.canvas.style.cursor = "pointer";
								}
							}
							this.imageRects.push([x, y, cellWidth, cellHeight]);

							let wratio = cellWidth/img.width;
							let hratio = cellHeight/img.height;
							var ratio = Math.min(wratio, hratio);

							let imgHeight = ratio * img.height;
							let imgY = row * cellHeight + shiftY + (cellHeight - imgHeight)/2;
							let imgWidth = ratio * img.width;
							let imgX = col * cellWidth + shiftX + (cellWidth - imgWidth)/2;

							ctx.drawImage(img, imgX+cell_padding, imgY+cell_padding, imgWidth-cell_padding*2, imgHeight-cell_padding*2);
							if(!compact_mode) {
								// rectangle cell and border line style
								ctx.strokeStyle = "#8F8F8F";
								ctx.lineWidth = 1;
								ctx.strokeRect(x+cell_padding, y+cell_padding, cellWidth-cell_padding*2, cellHeight-cell_padding*2);
							}

							ctx.filter = "none";
						}

						if (!anyHovered) {
							this.pointerDown = null;
							this.overIndex = null;
						}
					} else {
						// Draw individual
						let w = this.imgs[imageIndex].naturalWidth;
						let h = this.imgs[imageIndex].naturalHeight;

						const scaleX = dw / w;
						const scaleY = dh / h;
						const scale = Math.min(scaleX, scaleY, 1);

						w *= scale;
						h *= scale;

						let x = (dw - w) / 2;
						let y = (dh - h) / 2 + shiftY;
						ctx.drawImage(this.imgs[imageIndex], x, y, w, h);

						const drawButton = (x, y, sz, text) => {
							const hovered = LiteGraph.isInsideRectangle(mouse[0], mouse[1], x + this.pos[0], y + this.pos[1], sz, sz);
							let fill = "#333";
							let textFill = "#fff";
							let isClicking = false;
							if (hovered) {
								canvas.canvas.style.cursor = "pointer";
								if (canvas.pointer_is_down) {
									fill = "#1e90ff";
									isClicking = true;
								} else {
									fill = "#eee";
									textFill = "#000";
								}
							} else {
								this.pointerWasDown = null;
							}

							ctx.fillStyle = fill;
							ctx.beginPath();
							ctx.roundRect(x, y, sz, sz, [4]);
							ctx.fill();
							ctx.fillStyle = textFill;
							ctx.font = "12px Arial";
							ctx.textAlign = "center";
							ctx.fillText(text, x + 15, y + 20);

							return isClicking;
						};

						if (numImages > 1) {
							if (drawButton(dw - 40, dh + top - 40, 30, `${this.imageIndex + 1}/${numImages}`)) {
								let i = this.imageIndex + 1 >= numImages ? 0 : this.imageIndex + 1;
								if (!this.pointerDown || !this.pointerDown.index === i) {
									this.pointerDown = { index: i, pos: [...mouse] };
								}
							}

							if (drawButton(dw - 40, top + 10, 30, `x`)) {
								if (!this.pointerDown || !this.pointerDown.index === null) {
									this.pointerDown = { index: null, pos: [...mouse] };
								}
							}
						}
					}
				}
			}
		};
	}

	/**
	 * Adds a handler allowing drag+drop of files onto the window to load workflows
	 */
	#addDropHandler() {
		// Get prompt from dropped PNG or json
		document.addEventListener("drop", async (event) => {
			event.preventDefault();
			event.stopPropagation();

			const n = this.dragOverNode;
			this.dragOverNode = null;
			// Node handles file drop, we dont use the built in onDropFile handler as its buggy
			// If you drag multiple files it will call it multiple times with the same file
			if (n && n.onDragDrop && (await n.onDragDrop(event))) {
				return;
			}
			// Dragging from Chrome->Firefox there is a file but its a bmp, so ignore that
			if (event.dataTransfer.files.length && event.dataTransfer.files[0].type !== "image/bmp") {
			await this.handleFile(event.dataTransfer.files[0]);
			} else {
				// Try loading the first URI in the transfer list
				const validTypes = ["text/uri-list", "text/x-moz-url"];
				const match = [...event.dataTransfer.types].find((t) => validTypes.find(v => t === v));
				if (match) {
					const uri = event.dataTransfer.getData(match)?.split("\n")?.[0];
					if (uri) {
						await this.handleFile(await (await fetch(uri)).blob());
					}
				}
			}
		});

		// Always clear over node on drag leave
		this.canvasEl.addEventListener("dragleave", async () => {
			if (this.dragOverNode) {
				this.dragOverNode = null;
				this.graph.setDirtyCanvas(false, true);
			}
		});

		// Add handler for dropping onto a specific node
		this.canvasEl.addEventListener(
			"dragover",
			(e) => {
				this.canvas.adjustMouseEvent(e);
				const node = this.graph.getNodeOnPos(e.canvasX, e.canvasY);
				if (node) {
					if (node.onDragOver && node.onDragOver(e)) {
						this.dragOverNode = node;

						// dragover event is fired very frequently, run this on an animation frame
						requestAnimationFrame(() => {
							this.graph.setDirtyCanvas(false, true);
						});
						return;
					}
				}
				this.dragOverNode = null;
			},
			false
		);
	}

	/**
	 * Adds a handler on paste that extracts and loads images or workflows from pasted JSON data
	 */
	#addPasteHandler() {
		document.addEventListener("paste", (e) => {
			// ctrl+shift+v is used to paste nodes with connections
			// this is handled by litegraph
			if(this.shiftDown) return;

			let data = (e.clipboardData || window.clipboardData);
			const items = data.items;

			// Look for image paste data
			for (const item of items) {
				if (item.type.startsWith('image/')) {
					var imageNode = null;

					// If an image node is selected, paste into it
					if (this.canvas.current_node &&
						this.canvas.current_node.is_selected &&
						ComfyApp.isImageNode(this.canvas.current_node)) {
						imageNode = this.canvas.current_node;
					}

					// No image node selected: add a new one
					if (!imageNode) {
						const newNode = LiteGraph.createNode("LoadImage");
						newNode.pos = [...this.canvas.graph_mouse];
						imageNode = this.graph.add(newNode);
						this.graph.change();
					}
					const blob = item.getAsFile();
					imageNode.pasteFile(blob);
					return;
				}
			}

			// No image found. Look for node data
			data = data.getData("text/plain");
			let workflow;
			try {
				data = data.slice(data.indexOf("{"));
				workflow = JSON.parse(data);
			} catch (err) {
				try {
					data = data.slice(data.indexOf("workflow\n"));
					data = data.slice(data.indexOf("{"));
					workflow = JSON.parse(data);
				} catch (error) {}
			}

			if (workflow && workflow.version && workflow.nodes && workflow.extra) {
				this.loadGraphData(workflow);
			}
			else {
				if (e.target.type === "text" || e.target.type === "textarea") {
					return;
				}

				// Litegraph default paste
				this.canvas.pasteFromClipboard();
			}


		});
	}


	/**
	 * Adds a handler on copy that serializes selected nodes to JSON
	 */
	#addCopyHandler() {
		document.addEventListener("copy", (e) => {
			if (e.target.type === "text" || e.target.type === "textarea") {
				// Default system copy
				return;
			}

			// copy nodes and clear clipboard
			if (e.target.className === "litegraph" && this.canvas.selected_nodes) {
				this.canvas.copyToClipboard();
				e.clipboardData.setData('text', ' '); //clearData doesn't remove images from clipboard
				e.preventDefault();
				e.stopImmediatePropagation();
				return false;
			}
		});
	}


	/**
	 * Handle mouse
	 *
	 * Move group by header
	 */
	#addProcessMouseHandler() {
		const self = this;

		const origProcessMouseDown = LGraphCanvas.prototype.processMouseDown;
		LGraphCanvas.prototype.processMouseDown = function(e) {
			const res = origProcessMouseDown.apply(this, arguments);

			this.selected_group_moving = false;

			if (this.selected_group && !this.selected_group_resizing) {
				var font_size =
					this.selected_group.font_size || LiteGraph.DEFAULT_GROUP_FONT_SIZE;
				var height = font_size * 1.4;

				// Move group by header
				if (LiteGraph.isInsideRectangle(e.canvasX, e.canvasY, this.selected_group.pos[0], this.selected_group.pos[1], this.selected_group.size[0], height)) {
					this.selected_group_moving = true;
				}
			}

			return res;
		}

		const origProcessMouseMove = LGraphCanvas.prototype.processMouseMove;
		LGraphCanvas.prototype.processMouseMove = function(e) {
			const orig_selected_group = this.selected_group;

			if (this.selected_group && !this.selected_group_resizing && !this.selected_group_moving) {
				this.selected_group = null;
			}

			const res = origProcessMouseMove.apply(this, arguments);

			if (orig_selected_group && !this.selected_group_resizing && !this.selected_group_moving) {
				this.selected_group = orig_selected_group;
			}

			return res;
		};
	}

	/**
	 * Handle keypress
	 *
	 * Ctrl + M mute/unmute selected nodes
	 */
	#addProcessKeyHandler() {
		const self = this;
		const origProcessKey = LGraphCanvas.prototype.processKey;
		LGraphCanvas.prototype.processKey = function(e) {
			if (!this.graph) {
				return;
			}

			var block_default = false;

			if (e.target.localName == "input") {
				return;
			}

			if (e.type == "keydown" && !e.repeat) {

				// Ctrl + M mute/unmute
				if (e.key === 'm' && e.ctrlKey) {
					if (this.selected_nodes) {
						for (var i in this.selected_nodes) {
							if (this.selected_nodes[i].mode === 2) { // never
								this.selected_nodes[i].mode = 0; // always
							} else {
								this.selected_nodes[i].mode = 2; // never
							}
						}
					}
					block_default = true;
				}

				// Ctrl + B bypass
				if (e.key === 'b' && e.ctrlKey) {
					if (this.selected_nodes) {
						for (var i in this.selected_nodes) {
							if (this.selected_nodes[i].mode === 4) { // never
								this.selected_nodes[i].mode = 0; // always
							} else {
								this.selected_nodes[i].mode = 4; // never
							}
						}
					}
					block_default = true;
				}

				// Alt + C collapse/uncollapse
				if (e.key === 'c' && e.altKey) {
					if (this.selected_nodes) {
						for (var i in this.selected_nodes) {
							this.selected_nodes[i].collapse()
						}
					}
					block_default = true;
				}

				// Ctrl+C Copy
				if ((e.key === 'c') && (e.metaKey || e.ctrlKey)) {
					// Trigger onCopy
					return true;
				}

				// Ctrl+V Paste
				if ((e.key === 'v' || e.key == 'V') && (e.metaKey || e.ctrlKey) && !e.shiftKey) {
					// Trigger onPaste
					return true;
				}
			}

			this.graph.change();

			if (block_default) {
				e.preventDefault();
				e.stopImmediatePropagation();
				return false;
			}

			// Fall through to Litegraph defaults
			return origProcessKey.apply(this, arguments);
		};
	}

	/**
	 * Draws group header bar
	 */
	#addDrawGroupsHandler() {
		const self = this;

		const origDrawGroups = LGraphCanvas.prototype.drawGroups;
		LGraphCanvas.prototype.drawGroups = function(canvas, ctx) {
			if (!this.graph) {
				return;
			}

			var groups = this.graph._groups;

			ctx.save();
			ctx.globalAlpha = 0.7 * this.editor_alpha;

			for (var i = 0; i < groups.length; ++i) {
				var group = groups[i];

				if (!LiteGraph.overlapBounding(this.visible_area, group._bounding)) {
					continue;
				} //out of the visible area

				ctx.fillStyle = group.color || "#335";
				ctx.strokeStyle = group.color || "#335";
				var pos = group._pos;
				var size = group._size;
				ctx.globalAlpha = 0.25 * this.editor_alpha;
				ctx.beginPath();
				var font_size =
					group.font_size || LiteGraph.DEFAULT_GROUP_FONT_SIZE;
				ctx.rect(pos[0] + 0.5, pos[1] + 0.5, size[0], font_size * 1.4);
				ctx.fill();
				ctx.globalAlpha = this.editor_alpha;
			}

			ctx.restore();

			const res = origDrawGroups.apply(this, arguments);
			return res;
		}
	}

	/**
	 * Draws node highlights (executing, drag drop) and progress bar
	 */
	#addDrawNodeHandler() {
		const origDrawNodeShape = LGraphCanvas.prototype.drawNodeShape;
		const self = this;

		LGraphCanvas.prototype.drawNodeShape = function (node, ctx, size, fgcolor, bgcolor, selected, mouse_over) {
			const res = origDrawNodeShape.apply(this, arguments);

			const nodeErrors = self.lastNodeErrors?.[node.id];

			let color = null;
			let lineWidth = 1;
			if (node.id === +self.runningNodeId) {
				color = "#0f0";
			} else if (self.dragOverNode && node.id === self.dragOverNode.id) {
				color = "dodgerblue";
			}
			else if (nodeErrors?.errors) {
				color = "red";
				lineWidth = 2;
			}
			else if (self.lastExecutionError && +self.lastExecutionError.node_id === node.id) {
				color = "#f0f";
				lineWidth = 2;
			}

			if (color) {
				const shape = node._shape || node.constructor.shape || LiteGraph.ROUND_SHAPE;
				ctx.lineWidth = lineWidth;
				ctx.globalAlpha = 0.8;
				ctx.beginPath();
				if (shape == LiteGraph.BOX_SHAPE)
					ctx.rect(-6, -6 - LiteGraph.NODE_TITLE_HEIGHT, 12 + size[0] + 1, 12 + size[1] + LiteGraph.NODE_TITLE_HEIGHT);
				else if (shape == LiteGraph.ROUND_SHAPE || (shape == LiteGraph.CARD_SHAPE && node.flags.collapsed))
					ctx.roundRect(
						-6,
						-6 - LiteGraph.NODE_TITLE_HEIGHT,
						12 + size[0] + 1,
						12 + size[1] + LiteGraph.NODE_TITLE_HEIGHT,
						this.round_radius * 2
					);
				else if (shape == LiteGraph.CARD_SHAPE)
					ctx.roundRect(
						-6,
						-6 - LiteGraph.NODE_TITLE_HEIGHT,
						12 + size[0] + 1,
						12 + size[1] + LiteGraph.NODE_TITLE_HEIGHT,
						[this.round_radius * 2, this.round_radius * 2, 2, 2]
				);
				else if (shape == LiteGraph.CIRCLE_SHAPE)
					ctx.arc(size[0] * 0.5, size[1] * 0.5, size[0] * 0.5 + 6, 0, Math.PI * 2);
				ctx.strokeStyle = color;
				ctx.stroke();
				ctx.strokeStyle = fgcolor;
				ctx.globalAlpha = 1;
			}

			if (self.progress && node.id === +self.runningNodeId) {
				ctx.fillStyle = "green";
				ctx.fillRect(0, 0, size[0] * (self.progress.value / self.progress.max), 6);
				ctx.fillStyle = bgcolor;
			}

			// Highlight inputs that failed validation
			if (nodeErrors) {
				ctx.lineWidth = 2;
				ctx.strokeStyle = "red";
				for (const error of nodeErrors.errors) {
					if (error.extra_info && error.extra_info.input_name) {
						const inputIndex = node.findInputSlot(error.extra_info.input_name)
						if (inputIndex !== -1) {
							let pos = node.getConnectionPos(true, inputIndex);
							ctx.beginPath();
							ctx.arc(pos[0] - node.pos[0], pos[1] - node.pos[1], 12, 0, 2 * Math.PI, false)
							ctx.stroke();
						}
					}
				}
			}

			return res;
		};

		const origDrawNode = LGraphCanvas.prototype.drawNode;
		LGraphCanvas.prototype.drawNode = function (node, ctx) {
			var editor_alpha = this.editor_alpha;
			var old_color = node.bgcolor;

			if (node.mode === 2) { // never
				this.editor_alpha = 0.4;
			}

			if (node.mode === 4) { // never
				node.bgcolor = "#FF00FF";
				this.editor_alpha = 0.2;
			}

			const res = origDrawNode.apply(this, arguments);

			this.editor_alpha = editor_alpha;
			node.bgcolor = old_color;

			return res;
		};
	}

	/**
	 * Handles updates from the API socket
	 */
	#addApiUpdateHandlers() {
		api.addEventListener("status", ({ detail }) => {
			this.ui.setStatus(detail);
		});

		api.addEventListener("reconnecting", () => {
			this.ui.dialog.show("Reconnecting...");
		});

		api.addEventListener("reconnected", () => {
			this.ui.dialog.close();
		});

		api.addEventListener("progress", ({ detail }) => {
			this.progress = detail;
			this.graph.setDirtyCanvas(true, false);
		});

		api.addEventListener("executing", ({ detail }) => {
			this.progress = null;
			this.runningNodeId = detail;
			this.graph.setDirtyCanvas(true, false);
			delete this.nodePreviewImages[this.runningNodeId]
		});

		api.addEventListener("executed", ({ detail }) => {
			this.nodeOutputs[detail.node] = detail.output;
			const node = this.graph.getNodeById(detail.node);
			if (node) {
				if (node.onExecuted)
					node.onExecuted(detail.output);
			}
		});

		api.addEventListener("execution_start", ({ detail }) => {
			this.runningNodeId = null;
			this.lastExecutionError = null
			this.graph._nodes.forEach((node) => {
				if (node.onExecutionStart)
					node.onExecutionStart()
			})
		});

		api.addEventListener("execution_error", ({ detail }) => {
			this.lastExecutionError = detail;
			const formattedError = this.#formatExecutionError(detail);
			this.ui.dialog.show(formattedError);
			this.canvas.draw(true, true);
		});

		api.addEventListener("b_preview", ({ detail }) => {
			const id = this.runningNodeId
			if (id == null)
				return;

			const blob = detail
			const blobUrl = URL.createObjectURL(blob)
			this.nodePreviewImages[id] = [blobUrl]
		});

		api.init();
	}

	#addKeyboardHandler() {
		window.addEventListener("keydown", (e) => {
			this.shiftDown = e.shiftKey;
		});
		window.addEventListener("keyup", (e) => {
			this.shiftDown = e.shiftKey;
		});
	}

	#addConfigureHandler() {
		const app = this;
		const configure = LGraph.prototype.configure;
		// Flag that the graph is configuring to prevent nodes from running checks while its still loading
		LGraph.prototype.configure = function () {
			app.configuringGraph = true;
			try {
				return configure.apply(this, arguments);
			} finally {
				app.configuringGraph = false;
			}
		};
	}

	#addAfterConfigureHandler() {
		const app = this;
		const onConfigure = app.graph.onConfigure;
		app.graph.onConfigure = function () {
			// Fire callbacks before the onConfigure, this is used by widget inputs to setup the config
			for (const node of app.graph._nodes) {
				node.onGraphConfigured?.();
			}
			
			const r = onConfigure?.apply(this, arguments);
			
			// Fire after onConfigure, used by primitves to generate widget using input nodes config
			for (const node of app.graph._nodes) {
				node.onAfterGraphConfigured?.();
			}

			return r;
		};
	}

	/**
	 * Loads all extensions from the API into the window in parallel
	 */
	async #loadExtensions() {
	    const extensions = await api.getExtensions();
	    this.logging.addEntry("Comfy.App", "debug", { Extensions: extensions });
	
	    const extensionPromises = extensions.map(async ext => {
	        try {
	            await import(api.apiURL(ext));
	        } catch (error) {
	            console.error("Error loading extension", ext, error);
	        }
	    });
	
	    await Promise.all(extensionPromises);
	}

	/**
	 * Set up the app on the page
	 */
	async setup() {
		await this.#loadExtensions();

		// Create and mount the LiteGraph in the DOM
		const mainCanvas = document.createElement("canvas")
		mainCanvas.style.touchAction = "none"
		const canvasEl = (this.canvasEl = Object.assign(mainCanvas, { id: "graph-canvas" }));
		canvasEl.tabIndex = "1";
		document.body.prepend(canvasEl);

		this.#addProcessMouseHandler();
		this.#addProcessKeyHandler();
		this.#addConfigureHandler();

		this.graph = new LGraph();

		this.#addAfterConfigureHandler();

		const canvas = (this.canvas = new LGraphCanvas(canvasEl, this.graph));
		this.ctx = canvasEl.getContext("2d");

		LiteGraph.release_link_on_empty_shows_menu = true;
		LiteGraph.alt_drag_do_clone_nodes = true;

		this.graph.start();

		function resizeCanvas() {
			// Limit minimal scale to 1, see https://github.com/comfyanonymous/ComfyUI/pull/845
			const scale = Math.max(window.devicePixelRatio, 1);
			const { width, height } = canvasEl.getBoundingClientRect();
			canvasEl.width = Math.round(width * scale);
			canvasEl.height = Math.round(height * scale);
			canvasEl.getContext("2d").scale(scale, scale);
			canvas.draw(true, true);
		}

		// Ensure the canvas fills the window
		resizeCanvas();
		window.addEventListener("resize", resizeCanvas);

		await this.#invokeExtensionsAsync("init");
		await this.registerNodes();

		// Load previous workflow
		let restored = false;
		try {
			const json = localStorage.getItem("workflow");
			if (json) {
				const workflow = JSON.parse(json);
				this.loadGraphData(workflow);
				restored = true;
			}
		} catch (err) {
			console.error("Error loading previous workflow", err);
		}

		// We failed to restore a workflow so load the default
		if (!restored) {
			this.loadGraphData();
		}

		// Save current workflow automatically
		setInterval(() => localStorage.setItem("workflow", JSON.stringify(this.graph.serialize())), 1000);

		this.#addDrawNodeHandler();
		this.#addDrawGroupsHandler();
		this.#addApiUpdateHandlers();
		this.#addDropHandler();
		this.#addCopyHandler();
		this.#addPasteHandler();
		this.#addKeyboardHandler();

		await this.#invokeExtensionsAsync("setup");
	}

	/**
	 * Registers nodes with the graph
	 */
	async registerNodes() {
		const app = this;
		// Load node definitions from the backend
		const defs = await api.getNodeDefs();
		await this.registerNodesFromDefs(defs);
		await this.#invokeExtensionsAsync("registerCustomNodes");
	}

    async registerNodesFromDefs(defs) {
		await this.#invokeExtensionsAsync("addCustomNodeDefs", defs);

		// Generate list of known widgets
		const widgets = Object.assign(
			{},
			ComfyWidgets,
			...(await this.#invokeExtensionsAsync("getCustomWidgets")).filter(Boolean)
		);

		// Register a node for each definition
		for (const nodeId in defs) {
			const nodeData = defs[nodeId];
			const node = Object.assign(
				function ComfyNode() {
					var inputs = nodeData["input"]["required"];
					if (nodeData["input"]["optional"] != undefined){
					    inputs = Object.assign({}, nodeData["input"]["required"], nodeData["input"]["optional"])
					}
					const config = { minWidth: 1, minHeight: 1 };
					for (const inputName in inputs) {
						const inputData = inputs[inputName];
						const type = inputData[0];

						let widgetCreated = true;
						if (Array.isArray(type)) {
							// Enums
							Object.assign(config, widgets.COMBO(this, inputName, inputData, app) || {});
						} else if (`${type}:${inputName}` in widgets) {
							// Support custom widgets by Type:Name
							Object.assign(config, widgets[`${type}:${inputName}`](this, inputName, inputData, app) || {});
						} else if (type in widgets) {
							// Standard type widgets
							Object.assign(config, widgets[type](this, inputName, inputData, app) || {});
						} else {
							// Node connection inputs
							this.addInput(inputName, type);
							widgetCreated = false;
						}

						if(widgetCreated && inputData[1]?.forceInput && config?.widget) {
							if (!config.widget.options) config.widget.options = {};
							config.widget.options.forceInput = inputData[1].forceInput;
						}
						if(widgetCreated && inputData[1]?.defaultInput && config?.widget) {
							if (!config.widget.options) config.widget.options = {};
							config.widget.options.defaultInput = inputData[1].defaultInput;
						}
					}

					for (const o in nodeData["output"]) {
						let output = nodeData["output"][o];
						if(output instanceof Array) output = "COMBO";
						const outputName = nodeData["output_name"][o] || output;
						const outputShape = nodeData["output_is_list"][o] ? LiteGraph.GRID_SHAPE : LiteGraph.CIRCLE_SHAPE ;
						this.addOutput(outputName, output, { shape: outputShape });
					}

					const s = this.computeSize();
					s[0] = Math.max(config.minWidth, s[0] * 1.5);
					s[1] = Math.max(config.minHeight, s[1]);
					this.size = s;
					this.serialize_widgets = true;

					app.#invokeExtensionsAsync("nodeCreated", this);
				},
				{
					title: nodeData.display_name || nodeData.name,
					comfyClass: nodeData.name,
					nodeData
				}
			);
			node.prototype.comfyClass = nodeData.name;

			this.#addNodeContextMenuHandler(node);
			this.#addDrawBackgroundHandler(node, app);
			this.#addNodeKeyHandler(node);

			await this.#invokeExtensionsAsync("beforeRegisterNodeDef", node, nodeData);
			LiteGraph.registerNodeType(nodeId, node);
			node.category = nodeData.category;
		}
	}

	loadTemplateData(templateData) {
		if (!templateData?.templates) {
			return;
		}

		const old = localStorage.getItem("litegrapheditor_clipboard");

		var maxY, nodeBottom, node;

		for (const template of templateData.templates) {
			if (!template?.data) {
				continue;
			}

			localStorage.setItem("litegrapheditor_clipboard", template.data);
			app.canvas.pasteFromClipboard();

			// Move mouse position down to paste the next template below

			maxY = false;

			for (const i in app.canvas.selected_nodes) {
				node = app.canvas.selected_nodes[i];

				nodeBottom = node.pos[1] + node.size[1];

				if (maxY === false || nodeBottom > maxY) {
					maxY = nodeBottom;
				}
			}

			app.canvas.graph_mouse[1] = maxY + 50;
		}

		localStorage.setItem("litegrapheditor_clipboard", old);
	}

	/**
	 * Populates the graph with the specified workflow data
	 * @param {*} graphData A serialized graph object
	 */
	loadGraphData(graphData) {
		this.clean();

		let reset_invalid_values = false;
		if (!graphData) {
			if (typeof structuredClone === "undefined")
			{
				graphData = JSON.parse(JSON.stringify(defaultGraph));
			}else
			{
				graphData = structuredClone(defaultGraph);
			}
			reset_invalid_values = true;
		}

		const missingNodeTypes = [];
		for (let n of graphData.nodes) {
			// Patch T2IAdapterLoader to ControlNetLoader since they are the same node now
			if (n.type == "T2IAdapterLoader") n.type = "ControlNetLoader";
			if (n.type == "ConditioningAverage ") n.type = "ConditioningAverage"; //typo fix

			// Find missing node types
			if (!(n.type in LiteGraph.registered_node_types)) {
				n.type = sanitizeNodeName(n.type);
				missingNodeTypes.push(n.type);
			}
		}

		try {
			this.graph.configure(graphData);
		} catch (error) {
			let errorHint = [];
			// Try extracting filename to see if it was caused by an extension script
			const filename = error.fileName || (error.stack || "").match(/(\/extensions\/.*\.js)/)?.[1];
			const pos = (filename || "").indexOf("/extensions/");
			if (pos > -1) {
				errorHint.push(
					$el("span", { textContent: "This may be due to the following script:" }),
					$el("br"),
					$el("span", {
						style: {
							fontWeight: "bold",
						},
						textContent: filename.substring(pos),
					})
				);
			}

			// Show dialog to let the user know something went wrong loading the data
			this.ui.dialog.show(
				$el("div", [
					$el("p", { textContent: "Loading aborted due to error reloading workflow data" }),
					$el("pre", {
						style: { padding: "5px", backgroundColor: "rgba(255,0,0,0.2)" },
						textContent: error.toString(),
					}),
					$el("pre", {
						style: {
							padding: "5px",
							color: "#ccc",
							fontSize: "10px",
							maxHeight: "50vh",
							overflow: "auto",
							backgroundColor: "rgba(0,0,0,0.2)",
						},
						textContent: error.stack || "No stacktrace available",
					}),
					...errorHint,
				]).outerHTML
			);

			return;
		}

		for (const node of this.graph._nodes) {
			const size = node.computeSize();
			size[0] = Math.max(node.size[0], size[0]);
			size[1] = Math.max(node.size[1], size[1]);
			node.size = size;

			if (node.widgets) {
				// If you break something in the backend and want to patch workflows in the frontend
				// This is the place to do this
				for (let widget of node.widgets) {
					if (node.type == "KSampler" || node.type == "KSamplerAdvanced") {
						if (widget.name == "sampler_name") {
							if (widget.value.startsWith("sample_")) {
								widget.value = widget.value.slice(7);
							}
						}
					}
					if (node.type == "KSampler" || node.type == "KSamplerAdvanced" || node.type == "PrimitiveNode") {
						if (widget.name == "control_after_generate") {
							if (widget.value === true) {
								widget.value = "randomize";
							} else if (widget.value === false) {
								widget.value = "fixed";
							}
						}
					}
					if (reset_invalid_values) {
						if (widget.type == "combo") {
							if (!widget.options.values.includes(widget.value) && widget.options.values.length > 0) {
								widget.value = widget.options.values[0];
							}
						}
					}
				}
			}

			this.#invokeExtensions("loadedGraphNode", node);
		}

		if (missingNodeTypes.length) {
			this.ui.dialog.show(
				`When loading the graph, the following node types were not found: <ul>${Array.from(new Set(missingNodeTypes)).map(
					(t) => `<li>${t}</li>`
				).join("")}</ul>Nodes that have failed to load will show as red on the graph.`
			);
			this.logging.addEntry("Comfy.App", "warn", {
				MissingNodes: missingNodeTypes,
			});
		}
	}

	/**
	 * Converts the current graph workflow for sending to the API
	 * @returns The workflow and node links
	 */
	async graphToPrompt() {
		for (const node of this.graph.computeExecutionOrder(false)) {
			if (node.isVirtualNode) {
				// Don't serialize frontend only nodes but let them make changes
				if (node.applyToGraph) {
					node.applyToGraph();
				}
				continue;
			}
		}

		const workflow = this.graph.serialize();
		const output = {};
		// Process nodes in order of execution
		for (const node of this.graph.computeExecutionOrder(false)) {
			const n = workflow.nodes.find((n) => n.id === node.id);

			if (node.isVirtualNode) {
				continue;
			}

			if (node.mode === 2 || node.mode === 4) {
				// Don't serialize muted nodes
				continue;
			}

			const inputs = {};
			const widgets = node.widgets;

			// Store all widget values
			if (widgets) {
				for (const i in widgets) {
					const widget = widgets[i];
					if (!widget.options || widget.options.serialize !== false) {
						inputs[widget.name] = widget.serializeValue ? await widget.serializeValue(n, i) : widget.value;
					}
				}
			}

			// Store all node links
			for (let i in node.inputs) {
				let parent = node.getInputNode(i);
				if (parent) {
					let link = node.getInputLink(i);
					while (parent.mode === 4 || parent.isVirtualNode) {
						let found = false;
						if (parent.isVirtualNode) {
							link = parent.getInputLink(link.origin_slot);
							if (link) {
								parent = parent.getInputNode(link.target_slot);
								if (parent) {
									found = true;
								}
							}
						} else if (link && parent.mode === 4) {
							let all_inputs = [link.origin_slot];
							if (parent.inputs) {
								all_inputs = all_inputs.concat(Object.keys(parent.inputs))
								for (let parent_input in all_inputs) {
									parent_input = all_inputs[parent_input];
									if (parent.inputs[parent_input]?.type === node.inputs[i].type) {
										link = parent.getInputLink(parent_input);
										if (link) {
											parent = parent.getInputNode(parent_input);
										}
										found = true;
										break;
									}
								}
							}
						}

						if (!found) {
							break;
						}
					}

					if (link) {
						inputs[node.inputs[i].name] = [String(link.origin_id), parseInt(link.origin_slot)];
					}
				}
			}

			output[String(node.id)] = {
				inputs,
				class_type: node.comfyClass,
			};
		}

		// Remove inputs connected to removed nodes

		for (const o in output) {
			for (const i in output[o].inputs) {
				if (Array.isArray(output[o].inputs[i])
					&& output[o].inputs[i].length === 2
					&& !output[output[o].inputs[i][0]]) {
					delete output[o].inputs[i];
				}
			}
		}

		return { workflow, output };
	}

	#formatPromptError(error) {
		if (error == null) {
			return "(unknown error)"
		}
		else if (typeof error === "string") {
			return error;
		}
		else if (error.stack && error.message) {
			return error.toString()
		}
		else if (error.response) {
			let message = error.response.error.message;
			if (error.response.error.details)
			message += ": " + error.response.error.details;
			for (const [nodeID, nodeError] of Object.entries(error.response.node_errors)) {
			message += "\n" + nodeError.class_type + ":"
				for (const errorReason of nodeError.errors) {
					message += "\n    - " + errorReason.message + ": " + errorReason.details
				}
			}
			return message
		}
		return "(unknown error)"
	}

	#formatExecutionError(error) {
		if (error == null) {
			return "(unknown error)"
		}

		const traceback = error.traceback.join("")
		const nodeId = error.node_id
		const nodeType = error.node_type

		return `Error occurred when executing ${nodeType}:\n\n${error.exception_message}\n\n${traceback}`
	}

	async queuePrompt(number, batchCount = 1) {
		this.#queueItems.push({ number, batchCount });

		// Only have one action process the items so each one gets a unique seed correctly
		if (this.#processingQueue) {
			return;
		}

		this.#processingQueue = true;
		this.lastNodeErrors = null;

		try {
			while (this.#queueItems.length) {
				({ number, batchCount } = this.#queueItems.pop());

				for (let i = 0; i < batchCount; i++) {
					const p = await this.graphToPrompt();

					try {
						const res = await api.queuePrompt(number, p);
						this.lastNodeErrors = res.node_errors;
						if (this.lastNodeErrors.length > 0) {
							this.canvas.draw(true, true);
						}
					} catch (error) {
						const formattedError = this.#formatPromptError(error)
						this.ui.dialog.show(formattedError);
						if (error.response) {
							this.lastNodeErrors = error.response.node_errors;
							this.canvas.draw(true, true);
						}
						break;
					}

					for (const n of p.workflow.nodes) {
						const node = graph.getNodeById(n.id);
						if (node.widgets) {
							for (const widget of node.widgets) {
								// Allow widgets to run callbacks after a prompt has been queued
								// e.g. random seed after every gen
								if (widget.afterQueued) {
									widget.afterQueued();
								}
							}
						}
					}

					this.canvas.draw(true, true);
					await this.ui.queue.update();
				}
			}
		} finally {
			this.#processingQueue = false;
		}
	}

	/**
	 * Loads workflow data from the specified file
	 * @param {File} file
	 */
	async handleFile(file) {
		if (file.type === "image/png") {
			const pngInfo = await getPngMetadata(file);
			if (pngInfo) {
				if (pngInfo.workflow) {
					this.loadGraphData(JSON.parse(pngInfo.workflow));
				} else if (pngInfo.parameters) {
					importA1111(this.graph, pngInfo.parameters);
				}
			}
		} else if (file.type === "image/webp") {
			const pngInfo = await getWebpMetadata(file);
			if (pngInfo) {
				if (pngInfo.workflow) {
					this.loadGraphData(JSON.parse(pngInfo.workflow));
				} else if (pngInfo.Workflow) {
					this.loadGraphData(JSON.parse(pngInfo.Workflow)); // Support loading workflows from that webp custom node.
				}
			}
		} else if (file.type === "application/json" || file.name?.endsWith(".json")) {
			const reader = new FileReader();
			reader.onload = () => {
				var jsonContent = JSON.parse(reader.result);
				if (jsonContent?.templates) {
					this.loadTemplateData(jsonContent);
				} else {
					this.loadGraphData(jsonContent);
				}
			};
			reader.readAsText(file);
		} else if (file.name?.endsWith(".latent") || file.name?.endsWith(".safetensors")) {
			const info = await getLatentMetadata(file);
			if (info.workflow) {
				this.loadGraphData(JSON.parse(info.workflow));
			}
		}
	}

	/**
	 * Registers a Comfy web extension with the app
	 * @param {ComfyExtension} extension
	 */
	registerExtension(extension) {
		if (!extension.name) {
			throw new Error("Extensions must have a 'name' property.");
		}
		if (this.extensions.find((ext) => ext.name === extension.name)) {
			throw new Error(`Extension named '${extension.name}' already registered.`);
		}
		this.extensions.push(extension);
	}

	/**
	 * Refresh combo list on whole nodes
	 */
	async refreshComboInNodes() {
		const defs = await api.getNodeDefs();

		for(const nodeId in LiteGraph.registered_node_types) {
			const node = LiteGraph.registered_node_types[nodeId];
			const nodeDef = defs[nodeId];
			if(!nodeDef) continue;

			node.nodeData = nodeDef;
		}

		for(let nodeNum in this.graph._nodes) {
			const node = this.graph._nodes[nodeNum];
			const def = defs[node.type];

			// Allow primitive nodes to handle refresh
			node.refreshComboInNode?.(defs);

			if(!def)
				continue;

			for(const widgetNum in node.widgets) {
				const widget = node.widgets[widgetNum]
				if(widget.type == "combo" && def["input"]["required"][widget.name] !== undefined) {
					widget.options.values = def["input"]["required"][widget.name][0];

					if(widget.name != 'image' && !widget.options.values.includes(widget.value)) {
						widget.value = widget.options.values[0];
						widget.callback(widget.value);
					}
				}
			}
		}
	}

	/**
	 * Clean current state
	 */
	clean() {
		this.nodeOutputs = {};
		this.nodePreviewImages = {}
		this.lastNodeErrors = null;
		this.lastExecutionError = null;
		this.runningNodeId = null;
	}
}

export const app = new ComfyApp();