BetterDiscordAddons/PluginsV2/ImageGallery/index.js

module.exports = (Plugin, Api, Vendor) => {
	if (typeof BDFDB !== "object") global.BDFDB = {$: Vendor.$, BDv2Api: Api};
	
	const {$} = Vendor;

	return class extends Plugin {
		initConstructor () {
			this.eventFired = false;
			
			this.imageMarkup = `<div class="${BDFDB.disCN.imagewrapper}" style="width: 100px; height: 100px;"><img src="" style="width: 100px; height: 100px; display: inline;"></div>`;
			
			this.css = ` 
				.image-gallery ${BDFDB.dotCN.imagewrapper}.prev,
				.image-gallery ${BDFDB.dotCN.imagewrapper}.next {
					position: absolute;
				} 
				
				.image-gallery ${BDFDB.dotCN.imagewrapper}.prev {
					right: 90%;
				} 
				
				.image-gallery ${BDFDB.dotCN.imagewrapper}.next {
					left: 90%;
				}`;
		}
		
		onStart () {
			var libraryScript = null;
			if (typeof BDFDB !== "object" || typeof BDFDB.isLibraryOutdated !== "function" || BDFDB.isLibraryOutdated()) {
				libraryScript = document.querySelector('head script[src="https://mwittrien.github.io/BetterDiscordAddons/Plugins/BDFDB.js"]');
				if (libraryScript) libraryScript.remove();
				libraryScript = document.createElement("script");
				libraryScript.setAttribute("type", "text/javascript");
				libraryScript.setAttribute("src", "https://mwittrien.github.io/BetterDiscordAddons/Plugins/BDFDB.js");
				document.head.appendChild(libraryScript);
			}
			this.startTimeout = setTimeout(() => {this.initialize();}, 30000);
			if (typeof BDFDB === "object" && typeof BDFDB.isLibraryOutdated === "function") this.initialize();
			else libraryScript.addEventListener("load", () => {this.initialize();});
			return true;
		}

		initialize () {
			if (typeof BDFDB === "object") {
				BDFDB.loadMessage(this);
				
				var observer = null;

				observer = new MutationObserver((changes, _) => {
					changes.forEach(
						(change, i) => {
							if (change.addedNodes) {
								change.addedNodes.forEach((node) => {
									if (node && node.tagName && node.querySelector(BDFDB.dotCN.imagewrapper) && node.querySelector(BDFDB.dotCN.downloadlink)) {
										this.loadImages(node);
									}
								});
							}
							if (change.removedNodes) {
								change.removedNodes.forEach((node) => {
									if (node && node.tagName && node.querySelector(BDFDB.dotCN.imagewrapper) && node.querySelector(BDFDB.dotCN.downloadlink)) {
										$(document).off("keyup." + this.name).off("keydown." + this.name);
									}
								});
							}
						}
					);
				});
				BDFDB.addObserver(this, BDFDB.dotCN.app + " ~ [class^='theme-']:not([class*='popouts'])", {name:"imageModalObserver",instance:observer}, {childList: true});

				return true;
			}
			else {
				console.error(this.name + ": Fatal Error: Could not load BD functions!");
				return false;
			}
		}

		onStop () {
			if (typeof BDFDB === "object") {
				BDFDB.unloadMessage(this);
				return true;
			}
			else {
				return false;
			}
		}

		
		// begin of own functions
		
		loadImages (modal) {
			var start = performance.now();
			var waitForImg = setInterval(() => {
				var img = modal.querySelector(BDFDB.dotCNS.imagewrapper + "img");
				if (img && img.src) {
					clearInterval(waitForImg);
					var message = this.getMessageGroupOfImage(img);
					if (message) {
						modal.classList.add("image-gallery");
						this.addImages(modal, message.querySelectorAll(BDFDB.dotCNS.imagewrapper + "img"), img);
					}
				}
				else if (performance.now() - start > 10000) {
					clearInterval(waitForImg);
				}
			}, 100);
		}
		
		getMessageGroupOfImage (thisimg) {
			if (thisimg && thisimg.src) {
				for (let group of document.querySelectorAll(BDFDB.dotCN.messagegroup)) {
					for (let img of group.querySelectorAll(BDFDB.dotCNS.imagewrapper + "img")) {
						if (img.src && this.getSrcOfImage(img) == this.getSrcOfImage(thisimg)) {
							return group;
						}
					}
				}
			}
			return null;
		}
		
		getSrcOfImage (img) {
			var src = img.src ? img.src : (img.querySelector("canvas") ? img.querySelector("canvas").src : "");
			return src.split("?width=")[0];
		}
		
		addImages (modal, imgs, img) {
			modal.querySelectorAll(`${BDFDB.dotCN.imagewrapper}.prev, ${BDFDB.dotCN.imagewrapper}.next`).forEach(ele => {ele.remove();});
			
			var prevImg, nextImg, index;
			for (index = 0; index < imgs.length; index++) {
				if (this.getSrcOfImage(img) == this.getSrcOfImage(imgs[index])) {
					prevImg = 	imgs[index-1];
					img = 		imgs[index];
					nextImg = 	imgs[index+1];
					break;
				}
			}
			
			$(modal).find(BDFDB.dotCN.imagewrapper)
				.addClass("current")
				.find("img").attr("src", this.getSrcOfImage(img));
				
			$(modal.querySelector(BDFDB.dotCN.downloadlink))
				.attr("href", this.getSrcOfImage(img));
				
			this.resizeImage(modal, img, modal.querySelector(BDFDB.dotCN.imagewrapper + ".current img"));
			if (prevImg) {
				$(this.imageMarkup)
					.appendTo(modal.querySelector(BDFDB.dotCN.modalinner))
					.addClass("prev")
					.off("click." + this.name).on("click." + this.name, () => {
						this.addImages(modal, imgs, prevImg);
					})
					.find("img").attr("src", this.getSrcOfImage(prevImg));
				this.resizeImage(modal, prevImg, modal.querySelector(BDFDB.dotCN.imagewrapper + ".prev img"));
			}
			if (nextImg) {
				$(this.imageMarkup)
					.appendTo(modal.querySelector(BDFDB.dotCN.modalinner))
					.addClass("next")
					.off("click." + this.name).on("click." + this.name, () => {
						this.addImages(modal, imgs, nextImg);
					})
					.find("img").attr("src", this.getSrcOfImage(nextImg));
				this.resizeImage(modal, nextImg, modal.querySelector(BDFDB.dotCN.imagewrapper + ".next img"));
			}
			
			$(document).off("keydown." + this.name).off("keyup." + this.name)
				.on("keydown." + this.name, (e) => {
					this.keyPressed({modal, imgs, prevImg, nextImg}, e);
				})
				.on("keyup." + this.name, () => {
					this.eventFired = false;
				});
		}
		
		resizeImage (container, src, img) {
			$(img).hide();
			var temp = new Image();
			temp.src = src.src.split("?width=")[0];
			temp.onload = function () {
				var resizeX = (container.clientWidth/src.clientWidth) * 0.71;
				var resizeY = (container.clientHeight/src.clientHeight) * 0.57;
				var resize = resizeX < resizeY ? resizeX : resizeY;
				var newWidth = src.clientWidth * resize;
				var newHeight = src.clientHeight * resize;
				newWidth = temp.width > newWidth ? newWidth : temp.width;
				newHeight = temp.height > newHeight ? newHeight : temp.height;
				
				var wrapper = img.parentElement;
				
				
				$(wrapper)
					.css("top", !wrapper.classList.contains("current") ? (container.clientHeight - newHeight) / 2 : "")
					.css("width", newWidth)
					.css("height", newHeight);
					
				$(img)
					.css("width", newWidth)
					.css("height", newHeight)
					.show();
			};
		}
		
		keyPressed (data, e) {
			if (!this.eventFired) {
				this.eventFired = true;
				if (e.keyCode == 37 && data.prevImg) {
					this.addImages(data.modal, data.imgs, data.prevImg);
				}
				else if (e.keyCode == 39 && data.nextImg) {
					this.addImages(data.modal, data.imgs, data.nextImg);
				}
			}
		}
	}
};