// Control UI -> POST /api/state
// Also subscribes to /events to show current state/connection.

(() => {
  const EMOTIONS = [
    { id: "neutral",   label: "Neutral",   icon: "•" },
    { id: "happy",     label: "Happy",     icon: "😊" },
    { id: "sad",       label: "Sad",       icon: "☹️" },
    { id: "angry",     label: "Angry",     icon: "😠" },
    { id: "sleepy",    label: "Sleepy",    icon: "😴" },
    { id: "surprised", label: "Surprised", icon: "😲" },
    { id: "excited",   label: "Excited",   icon: "⚡" },
  ];

  const clamp = (n,a,b) => Math.max(a, Math.min(b, n));
  const clamp01 = (v) => clamp(Number(v) || 0, 0, 1);

  const ui = {
    grid: document.getElementById("emotionGrid"),
    conn: document.getElementById("conn"),
    current: document.getElementById("current"),
    speaking: document.getElementById("speaking"),
    eyesMoving: document.getElementById("eyesMoving"),
    intensity: document.getElementById("intensity"),
    intensityVal: document.getElementById("intensityVal"),
    lookpad: document.getElementById("lookpad"),
    lookdot: document.getElementById("lookdot"),
    center: document.getElementById("center"),
    stareOff: document.getElementById("stareOff"),
  };

  const state = {
    emotion: "neutral",
    intensity: 0.85,
    speaking: false,
    eyesMoving: true,
    look: { x: 0, y: 0 },
    // stare/lock is represented by sending/omitting look.
    stare: false,
  };

  function renderEmotionButtons() {
    ui.grid.innerHTML = "";
    for (const e of EMOTIONS) {
      const b = document.createElement("button");
      b.className = "emobtn";
      b.dataset.emotion = e.id;
      b.innerHTML = `
        <div class="icon">${e.icon}</div>
        <div>
          <div style="font-weight:700">${e.label}</div>
          <div style="opacity:.6;font-size:12px">${e.id}</div>
        </div>
      `;
      b.addEventListener("click", () => {
        state.emotion = e.id;
        setActiveEmotion();
        sendState({ emotion: state.emotion });
      });
      ui.grid.appendChild(b);
    }
    setActiveEmotion();
  }

  function setActiveEmotion() {
    for (const btn of ui.grid.querySelectorAll(".emobtn")) {
      btn.classList.toggle("active", btn.dataset.emotion === state.emotion);
    }
    ui.current.textContent = state.emotion;
  }

  async function sendState(partial) {
    // Build payload. If stare=false -> do NOT send look (so face can drift).
    const payload = {
      emotion: state.emotion,
      intensity: state.intensity,
      speaking: state.speaking,
      eyesMoving: state.eyesMoving,
      ...partial,
    };

    if (state.stare) payload.look = { x: state.look.x, y: state.look.y };
    else delete payload.look;

    try {
      await fetch("/api/state", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(payload),
      });
    } catch (_) {
      // ignore; SSE status will show disconnected
    }
  }

  // intensity
  ui.intensity.addEventListener("input", () => {
    state.intensity = clamp01(ui.intensity.value);
    ui.intensityVal.textContent = state.intensity.toFixed(2);
    sendState({ intensity: state.intensity });
  });

  // toggles
  ui.speaking.addEventListener("change", () => {
    state.speaking = !!ui.speaking.checked;
    sendState({ speaking: state.speaking });
  });

  ui.eyesMoving.addEventListener("change", () => {
    state.eyesMoving = !!ui.eyesMoving.checked;
    sendState({ eyesMoving: state.eyesMoving });
  });

  // Look pad (touch/mouse)
  function setDotFromLook() {
    const r = ui.lookpad.getBoundingClientRect();
    const px = (state.look.x + 1) / 2 * r.width;
    const py = (state.look.y + 1) / 2 * r.height;
    ui.lookdot.style.left = `${px}px`;
    ui.lookdot.style.top  = `${py}px`;
    ui.lookdot.style.transform = "translate(-50%,-50%)";
  }

  function setLookFromEvent(ev) {
    const r = ui.lookpad.getBoundingClientRect();
    const x = clamp((ev.clientX - r.left) / r.width, 0, 1);
    const y = clamp((ev.clientY - r.top)  / r.height, 0, 1);

    state.look.x = (x * 2) - 1;
    state.look.y = (y * 2) - 1;
    state.stare = true; // touching pad implies stare
    setDotFromLook();
    sendState({}); // will include look because stare=true
  }

  let pointerDown = false;
  ui.lookpad.addEventListener("pointerdown", (ev) => {
    pointerDown = true;
    ui.lookpad.setPointerCapture(ev.pointerId);
    setLookFromEvent(ev);
  });
  ui.lookpad.addEventListener("pointermove", (ev) => {
    if (!pointerDown) return;
    setLookFromEvent(ev);
  });
  ui.lookpad.addEventListener("pointerup", () => { pointerDown = false; });

  // dblclick / double tap center
  let lastTap = 0;
  ui.lookpad.addEventListener("pointerdown", () => {
    const now = Date.now();
    if (now - lastTap < 280) {
      state.look = { x: 0, y: 0 };
      state.stare = true;
      setDotFromLook();
      sendState({});
    }
    lastTap = now;
  });

  ui.center.addEventListener("click", () => {
    state.look = { x: 0, y: 0 };
    state.stare = true;
    setDotFromLook();
    sendState({});
  });

  ui.stareOff.addEventListener("click", () => {
    state.stare = false; // omit look in next send
    sendState({});
  });

  // SSE subscribe to reflect current state + connection
  (function connectSSE(){
    let es;
    function open(){
      ui.conn.textContent = "connecting…";
      es = new EventSource("/events");

      es.onopen = () => ui.conn.textContent = "online";

      const apply = (msg) => {
        if (!msg || typeof msg !== "object") return;

        if (typeof msg.emotion === "string") state.emotion = msg.emotion;
        if (msg.intensity !== undefined) state.intensity = clamp01(msg.intensity);
        if (typeof msg.speaking === "boolean") state.speaking = msg.speaking;
        if (typeof msg.eyesMoving === "boolean") state.eyesMoving = msg.eyesMoving;

        if (msg.look && typeof msg.look === "object") {
          state.look = {
            x: clamp(Number(msg.look.x ?? 0), -1, 1),
            y: clamp(Number(msg.look.y ?? 0), -1, 1),
          };
          state.stare = true;
        }

        ui.intensity.value = String(state.intensity);
        ui.intensityVal.textContent = state.intensity.toFixed(2);
        ui.speaking.checked = state.speaking;
        ui.eyesMoving.checked = state.eyesMoving;

        setActiveEmotion();
        setDotFromLook();
      };

      es.addEventListener("state", (ev) => {
        try { apply(JSON.parse(ev.data)); } catch (_) {}
      });

      es.onmessage = (ev) => {
        try { apply(JSON.parse(ev.data)); } catch (_) {}
      };

      es.onerror = () => {
        ui.conn.textContent = "offline";
        try { es.close(); } catch (_) {}
        setTimeout(open, 1200);
      };
    }
    open();
  })();

  // init
  renderEmotionButtons();
  ui.intensityVal.textContent = state.intensity.toFixed(2);
  setDotFromLook();
})();