import { socket } from "./api.js";
import { errorText, h, replace } from "./dom.js";
import { findTask, onEach, state } from "./state.js";
const exitedCode = 4000;
const internalErrorCode = 1011;
const retryAfterMs = 2_000;
let loading;
function load() {
    loading ??= (async () => {
        document.head.append(h("link", { rel: "stylesheet", href: "/vendor/xterm.css" }));
        const xtermUrl = "/vendor/xterm.mjs";
        const fitUrl = "/vendor/addon-fit.mjs";
        const [x, f] = (await Promise.all([import(xtermUrl), import(fitUrl)]));
        await document.fonts.load(`13px ${getComputedStyle(document.documentElement).getPropertyValue("--font")}`);
        return { Terminal: x.Terminal, FitAddon: f.FitAddon };
    })();
    return loading;
}
function attach(taskId, screen, show) {
    const encoder = new TextEncoder();
    let term;
    let ws;
    let observer;
    let retry = 0;
    let done = false;
    const send = (data) => {
        if (ws?.readyState === WebSocket.OPEN) {
            ws.send(data);
        }
    };
    const connect = () => {
        if (!term || done) {
            return;
        }
        clearTimeout(retry);
        show("connecting…", false);
        const t = term;
        const s = socket("/api/tasks/{taskId}/terminal", { path: { taskId }, query: { cols: t.cols, rows: t.rows } });
        ws = s;
        s.onopen = () => {
            t.reset();
            show("", false);
        };
        s.onmessage = (e) => {
            t.write(new Uint8Array(e.data));
        };
        s.onclose = (e) => {
            if (ws !== s || done) {
                return;
            }
            ws = undefined;
            if (e.code === exitedCode) {
                show(`shell ended: ${e.reason}`, true);
                return;
            }
            if (e.code === internalErrorCode) {
                show(e.reason, true);
                return;
            }
            if (findTask(taskId)?.status !== "active") {
                show("task closed", false);
                return;
            }
            show("disconnected, reconnecting…", false);
            retry = setTimeout(connect, retryAfterMs);
        };
    };
    load()
        .then(({ Terminal, FitAddon }) => {
        if (done) {
            return;
        }
        const css = getComputedStyle(document.documentElement);
        const v = (name) => css.getPropertyValue(name).trim();
        const t = new Terminal({
            fontFamily: v("--font"),
            fontSize: 13,
            cursorBlink: true,
            scrollback: 5000,
            theme: {
                background: v("--bg"),
                foreground: v("--text"),
                cursor: v("--accent"),
                cursorAccent: v("--bg"),
                selectionBackground: v("--accent-tint"),
            },
        });
        const fit = new FitAddon();
        t.loadAddon(fit);
        t.open(screen);
        fit.fit();
        t.onData((data) => send(encoder.encode(data)));
        t.onBinary((data) => send(Uint8Array.from(data, (c) => c.charCodeAt(0))));
        t.onResize(({ cols, rows }) => {
            if (ws?.readyState === WebSocket.OPEN) {
                ws.send(JSON.stringify({ cols, rows }));
            }
        });
        observer = new ResizeObserver(() => fit.fit());
        observer.observe(screen);
        term = t;
        t.focus();
        connect();
    })
        .catch((err) => show(`terminal not loaded: ${errorText(err)}`, false));
    return () => {
        done = true;
        clearTimeout(retry);
        observer?.disconnect();
        ws?.close();
        term?.dispose();
    };
}
export function mountTerminal(root) {
    const status = h("span", { class: "terminal-status" });
    const restart = h("button", { type: "button", hidden: true }, "New shell");
    const screen = h("div", { class: "terminal-screen" });
    let attached;
    let detach = () => { };
    const show = (text, exited) => {
        status.textContent = text;
        restart.hidden = !exited;
    };
    const open = () => {
        detach();
        detach = () => { };
        attached = undefined;
        replace(screen);
        show("", false);
        const taskId = state.selectedTaskId;
        if (!taskId) {
            replace(screen, h("div", { class: "empty" }, "No task selected."));
            return;
        }
        if (findTask(taskId)?.status !== "active") {
            replace(screen, h("div", { class: "empty" }, "The task is closed; its worktree is gone."));
            return;
        }
        attached = taskId;
        detach = attach(taskId, screen, show);
    };
    restart.onclick = open;
    screen.addEventListener("keydown", (e) => {
        if (e.ctrlKey && !e.metaKey) {
            e.stopPropagation();
        }
    });
    const offs = [
        onEach(["selection"], open),
        onEach(["tasks"], () => {
            if (attached && findTask(attached)?.status !== "active") {
                open();
            }
        }),
    ];
    replace(root, h("div", { class: "terminal-view" }, h("header", { class: "terminal-header" }, h("span", { class: "terminal-title" }, "Shell in the task's worktree"), status, restart), screen));
    open();
    return () => {
        detach();
        for (const off of offs) {
            off();
        }
    };
}
//# sourceMappingURL=terminal.js.map