import "/static/vendor/ace/ace.js";
import { $el } from "/static/vendor/domutil/domutil.js";

class EditorTab extends HTMLElement {
	static observedAttributes = ["name", "selected"];

	private tabEl: HTMLDivElement;
	private buttonsEl: HTMLDivElement;
	private root: ShadowRoot;

	constructor() {
		super();
		this.root = this.attachShadow({ mode: "open" });

		const style = $el("style");
		style.textContent = `
		:host {
			border: 2px solid var(--table-border-color);
			padding: 0.5ch 0.8ch;
			background-color: var(--button-bg);
			cursor: pointer;
		}
		:host([selected="true"]) {
			background-color: var(--table-border-color);
			}
		:host([modified="true"]) .tab-name::after {
			content: " ᴹ";
		}
		:host([unsaved="true"]) {
			font-style: italic;
		}
		`;
		this.root.append(style);

		this.tabEl = $el("div", { className: "tab-name" }, this.getAttribute("name") || $el("i", "unknown"));
		this.buttonsEl = $el("div", { className: "buttons" });
		this.root.append(this.tabEl, this.buttonsEl);
	}

	connectedCallback() {
	}

	attributeChangedCallback(name, _, value) {
		switch (name) {
			case "name":
				this.tabEl.textContent = value;
				break;
			case "selected":
				this.classList.toggle("active", Boolean(value));
				break;
		}
	}
}
customElements.define("file-editor-tab", EditorTab);


class Editor extends HTMLElement {
	private editor: AceAjax.Editor;
	private tabEl: HTMLDivElement;
	private sessions: Record<string, AceAjax.IEditSession>;
	private root: ShadowRoot;
	private addTabButton: EditorTab;
	private original: Record<string, string>;

	constructor() {
		super();
		this.sessions = {};
		this.original = {};
		this.root = this.attachShadow({ mode: "open" });
	}

	connectedCallback() {
		this.addTabButton = new EditorTab();
		this.addTabButton.setAttribute("name", "+");
		this.addTabButton.addEventListener("click", () => this.#createNewTab());
		this.tabEl = $el("div", { className: "tab-container" }, this.addTabButton);
		this.root.append(this.tabEl);

		const style = $el("style");
		style.textContent = `
		.tab-container {
			display: flex;
			margin-bottom: -2px;
		}
		
		file-editor-tab:not(:first-child) {
			margin-left: -2px;
		}
		`;
		const slot = $el("slot", { name: "body" });
		this.root.append(style, slot);

		const editorEl = $el("div", { slot: "body" });
		this.append(editorEl);

		// Create editor
		ace.config.set('basePath', '/static/vendor/ace')
		this.editor = ace.edit(editorEl);

		// todo make this stuff customizable??
		this.editor.setTheme("ace/theme/dracula");
		this.editor.setOptions({
			fontFamily: "Iosevka Web",
			fontSize: "12pt",
		});
		this.editor.getSession().setUseWrapMode(true);
		this.editor.setKeyboardHandler("ace/keyboard/vim");
	}

	/**
	 * Add a file editing session
	 * @param name File name
	 * @param content File contents
	 */
	addFile(name: string, content: string, saved = true) {
		// Add to session list
		this.sessions[name] = ace.createEditSession(content);
		this.original[name] = content;

		// TODO replace this with auto-detection
		this.sessions[name].setMode("ace/mode/nix");

		// Create tab and set as active
		const tab = this.#addTab(name, saved);
		tab.click();

		this.sessions[name].on("change", () => {
			tab.setAttribute("modified", this.sessions[name].getValue() != this.original[name] ? "true" : "false");
		});
	}

	setCurrent(name: string) {
		this.editor.setSession(this.sessions[name]);
		this.tabEl.querySelectorAll<EditorTab>("file-editor-tab").forEach(el => {
			el.setAttribute("selected", el.getAttribute("name") == name ? "true" : "false");
		});
	}

	files(): [String, String][] {
		return Object.entries(this.sessions).map(([name, session]) => [name, session.getValue()]);
	}

	/**
	 * Create a new tab
	 * @param name Tab name
	 * @returns Tab element
	 */
	#addTab(name: string, saved = true) {
		const tab = new EditorTab();
		tab.setAttribute("name", name);
		tab.setAttribute("unsaved", saved ? "false" : "true");
		tab.addEventListener("click", () => this.setCurrent(name));
		this.tabEl.insertBefore(tab, this.addTabButton);
		return tab;
	}


	#createNewTab() {
		this.addFile(`untitled${Object.keys(this.sessions).filter(s => s.startsWith("untitled")).length + 1}`, "", false);
	}
}
customElements.define("file-editor", Editor);