/**
 * Reachy Mini — Morse Code. App entry.
 *
 *   index.html → #root (host shell mount) + #app (in-iframe surface)
 *   main.js    → dispatcher: standalone mountHost() | embed connectToHost()
 *
 * Standalone visit: mountHost() owns OAuth + robot picker + top bar, then
 * iframes back here with ?embedded=1. Embed visit: connectToHost() brings up
 * the WebRTC session and hands us a live `handle.reachy`. We build the UI on
 * it and register onLeave for safe teardown. (Mirrors marionette-js.)
 *
 * The robot is optional to the app's value: Compose→"This device", Listen,
 * and Learn all work with just a phone/laptop. The robot unlocks antenna
 * transmission and lets two Minis talk to each other.
 */
import { mountHost } from "https://cdn.jsdelivr.net/npm/@pollen-robotics/reachy-mini-sdk@1.8.0-rc1-main.dbe26af/host/dist/entry/auto.js";
import { connectToHost } from "https://cdn.jsdelivr.net/npm/@pollen-robotics/reachy-mini-sdk@1.8.0-rc1-main.dbe26af/host/dist/entry/embed.js";
import { safelyReturnToPose } from "./lib/animation-helpers.js";

import { makeTiming, SPEED_PRESETS } from "./lib/timing.js";
import { textToSchedule } from "./lib/wire.js";
import { DEFAULT_RULES } from "./lib/rules.js";
import { Synth } from "./lib/synth.js";
import { RobotTapper, DEFAULT_TAP_PROFILE } from "./lib/robot-tapper.js";
import { Mic } from "./lib/mic.js";
import { el, clear } from "./views/dom.js";
import { createCompose } from "./views/compose.js";
import { createListen } from "./views/listen.js";
import { createLearn } from "./views/learn.js";
import { createDemo } from "./views/demo.js";
import { createSettings } from "./views/settings.js";

const params = new URLSearchParams(window.location.search);
const isEmbed = params.get("embedded") === "1" || params.get("embed") === "1";

if (!isEmbed) {
    mountHost({
        appName: "Morse Code",
        appIconUrl: "public/icon.png",
        appEmoji: "📡",
        // We capture the LAPTOP/PHONE mic via getUserMedia for decoding; we do
        // not need the robot's inbound audio track, so no enableMicrophone.
    });
} else {
    bootEmbed().catch((err) => {
        console.error("[morse] bootEmbed failed:", err);
        document.body.innerHTML =
            `<pre style="padding:24px;color:#c00;font:14px ui-monospace">` +
            `Morse Code failed to start in the iframe:\n\n${err?.message || err}\n\n` +
            `Try reloading the Space; check the daemon version and the SDK pin in main.js.</pre>`;
    });
}

async function bootEmbed() {
    const handle = await connectToHost();
    const reachy = handle.reachy;

    document.documentElement.setAttribute("data-theme", handle.theme || "dark");
    handle.onThemeChange?.((t) => document.documentElement.setAttribute("data-theme", t));

    // ─── Shared, mutable config ───────────────────────────────────────
    const config = {
        mode: "app", // "app" | "demo"
        speed: "normal",
        unitMs: SPEED_PRESETS.normal,
        emitter: reachy ? "robot" : "device",
        beepFreq: 2200,
        detector: { highpassHz: 2000, thresholdFactor: 4.0 },
        tap: { ...DEFAULT_TAP_PROFILE },
        demo: { rules: DEFAULT_RULES.map((r) => ({ ...r })) },
    };

    const synth = new Synth({ freq: config.beepFreq });
    let tapper = reachy ? new RobotTapper(reachy, config.tap) : null;

    // Self-echo guard: while (and just after) THIS robot transmits, its own mic
    // hears the taps — Demo mode must not treat that as an incoming message.
    let selfEchoUntil = 0;
    let activeCancel = null;

    const ctx = {
        reachy,
        state: config,
        timing: () => makeTiming(config.unitMs),
        setSpeed(preset) {
            config.speed = preset;
            if (SPEED_PRESETS[preset]) config.unitMs = SPEED_PRESETS[preset];
        },
        synth: () => { synth.freq = config.beepFreq; return synth; },
        tapper: () => {
            if (!tapper && reachy) tapper = new RobotTapper(reachy, config.tap);
            if (tapper) tapper.p = { ...DEFAULT_TAP_PROFILE, ...config.tap };
            return tapper;
        },
        makeMic: (cbs) => new Mic({
            highpassHz: config.detector.highpassHz,
            detector: { thresholdFactor: config.detector.thresholdFactor },
            ...cbs,
        }),
        selfEchoActive: () => performance.now() < selfEchoUntil,
        isTransmitting: () => !!activeCancel,
        // Transmit `text` on the robot antennas (default) or device speaker.
        // Sets a self-echo window covering the whole send plus the idle-finalize
        // tail, so Demo mode ignores this robot's own taps.
        transmit: async (text, { onProgress, via } = {}) => {
            const t = makeTiming(config.unitMs);
            const { onsets, durationMs } = textToSchedule(text, t);
            if (!onsets.length) return;
            const useRobot = (via ?? config.emitter) === "robot" && !!reachy;
            selfEchoUntil = performance.now() + durationMs + t.wordGapMs * 2.5 + 3000;
            try {
                if (useRobot) {
                    const controller = new AbortController();
                    activeCancel = () => controller.abort();
                    ctxRef.tapper().p = { ...DEFAULT_TAP_PROFILE, ...config.tap };
                    await ctxRef.tapper().tap(onsets, { onTap: onProgress, signal: controller.signal });
                } else {
                    await new Promise((resolve) => {
                        const cancel = synth.play(onsets, {
                            onBlip: onProgress, onDone: resolve, clickMs: t.clickMs,
                        });
                        activeCancel = () => { cancel(); resolve(); };
                    });
                }
            } finally {
                activeCancel = null;
                // Extend past the finalize that fires after our last tap.
                selfEchoUntil = Math.max(selfEchoUntil, performance.now() + t.wordGapMs * 2.5 + 1500);
            }
        },
        toast,
    };
    const ctxRef = ctx;

    // ─── Views (single scrolling page: Compose, then always-on Listen,
    //     then the Learn chart — scroll down to look anything up while a
    //     live message keeps decoding) ────────────────────────────────────
    const views = {
        compose: createCompose(ctx),
        listen: createListen(ctx),
        learn: createLearn(ctx),
        demo: createDemo(ctx),
    };

    const app = document.getElementById("app");
    clear(app);

    // Header: brand + App/Demo mode toggle + settings.
    const modeBtns = {};
    const modeSeg = el("div.mode-seg");
    [["app", "App"], ["demo", "Demo"]].forEach(([v, label]) => {
        const b = el("button.mode-btn", { onclick: () => setMode(v) }, label);
        modeBtns[v] = b;
        modeSeg.append(b);
    });
    const header = el("header.appbar", {}, [
        el("div.brand", {}, [
            el("img.brand-logo-img", { src: "public/icon.png", alt: "" }),
            el("span.brand-name", {}, "Morse Code"),
        ]),
        modeSeg,
        el("button.icon-btn", { title: "Settings", onclick: openSettings }, "⚙️"),
    ]);

    // Two pages share one host; only the active page's view holds the mic.
    const appScroller = el("main.scroller", {}, [
        views.compose.node,
        el("hr.divider"),
        views.listen.node,
        el("hr.divider"),
        views.learn.node,
    ]);
    const demoScroller = el("main.scroller", {}, [views.demo.node]);
    const pageHost = el("div.page-host");

    app.append(header, pageHost);
    app.hidden = false;
    views.compose.onShow?.();
    views.learn.onShow?.();

    function setMode(mode) {
        config.mode = mode;
        Object.entries(modeBtns).forEach(([k, b]) => b.classList.toggle("active", k === mode));
        views.listen.onHide?.();
        views.demo.onHide?.();
        clear(pageHost);
        if (mode === "demo") {
            pageHost.append(demoScroller);
            views.demo.onShow?.();
        } else {
            pageHost.append(appScroller);
            // Always-on Listen: auto-start the mic (falls back to tap-to-start).
            views.listen.autoStart?.();
        }
    }
    ctx.setMode = setMode;
    setMode("app");

    // ─── Settings modal ─────────────────────────────────────────────
    function openSettings() {
        const overlay = el("div.overlay", { onclick: (e) => { if (e.target === overlay) close(); } });
        const close = () => { overlay.remove(); ctx._closeSettings = null; };
        ctx._closeSettings = close;
        const sheet = createSettings(ctx);
        const panel = el("div.sheet", {}, [
            el("div.sheet-head", {}, [el("h2", {}, config.mode === "demo" ? "Demo setup" : "Settings"),
                el("button.icon-btn", { onclick: close }, "✕")]),
            sheet.node,
        ]);
        overlay.append(panel);
        document.body.append(overlay);
    }

    // ─── Safe teardown ────────────────────────────────────────────────
    handle.onLeave?.(() => {
        try { tapper?.stop(); } catch { /* */ }
        try { synth.stop(); } catch { /* */ }
        try { views.listen.onHide?.(); } catch { /* */ }
        try { views.demo.onHide?.(); } catch { /* */ }
        if (reachy) return safelyReturnToPose(reachy);
    });

    window.addEventListener("error", (e) => console.error("[morse] uncaught", e.message));
}

// ─── Toast ────────────────────────────────────────────────────────────
let toastTimer = null;
function toast(msg) {
    let t = document.getElementById("toast");
    if (!t) {
        t = el("div#toast.toast");
        document.body.append(t);
    }
    t.textContent = msg;
    t.classList.add("show");
    clearTimeout(toastTimer);
    toastTimer = setTimeout(() => t.classList.remove("show"), 2600);
}