// Minimal: black background, cyan face elements only.
// Input via SSE /events (nginx -> :8001/events)
// Payload example:
// {"emotion":"angry","intensity":0.9,"look":{"x":0.9,"y":0.0},"speaking":true,"eyesMoving":true}

(() => {
  const OVERLAY_TIMEOUT_MS = 2500;

  const clamp = (n,a,b) => Math.max(a, Math.min(b, n));
  const clamp01 = (v) => {
    const n = Number(v);
    if (Number.isNaN(n)) return 0;
    return clamp(n, 0, 1);
  };

  const EMOTIONS = new Set(["neutral","happy","sad","angry","sleepy","surprised","excited"]);

  const state = {
    emotion: "neutral",
    intensity: 0.85,
    look: { x: 0, y: 0 },
    lookLock: false,
    speaking: false,
    eyesMoving: true,
  };

  // DOM
  const stage = document.getElementById("stage");
  const overlay = document.getElementById("overlay");

  const eyeL = document.getElementById("eyeL");
  const eyeR = document.getElementById("eyeR");
  const eyesGroup = document.getElementById("eyesGroup");
  const mouth = document.getElementById("mouth");

  // Touch overlay show
  let overlayTimer = null;
  function showOverlay(){
    overlay.classList.add("show");
    clearTimeout(overlayTimer);
    overlayTimer = setTimeout(() => overlay.classList.remove("show"), OVERLAY_TIMEOUT_MS);
  }
  stage.addEventListener("pointerdown", () => showOverlay(), { passive:true });

  // Face layout (centered)
  const BASE = {
    L: { x: 380, y: 270 },
    R: { x: 620, y: 270 },
    lookMaxPx: 22,
    mouthCx: 500,
    mouthY: 400,
  };

  function setStickerStyle(el, edge = 6) {
    const a = 0.80 + 0.20 * state.intensity;
    el.setAttribute("fill", `rgba(120,220,255,${a})`);
    el.setAttribute("stroke", `rgba(200,255,255,${0.55 + 0.35 * state.intensity})`);
    el.setAttribute("stroke-width", String(edge));
    el.setAttribute("stroke-linejoin", "round");
    el.setAttribute("stroke-linecap", "round");
  }

  // --- Shapes (filled cyan like your reference) ---
  function eyeOval(cx, cy) {
    const rx=34, ry=58;
    return `M ${cx},${cy-ry}
            C ${cx+rx},${cy-ry} ${cx+rx},${cy+ry} ${cx},${cy+ry}
            C ${cx-rx},${cy+ry} ${cx-rx},${cy-ry} ${cx},${cy-ry} Z`;
  }
  function eyeHappy(cx, cy) {
    const w=70, h=52;
    const x1=cx-w/2, x2=cx+w/2, y=cy-18;
    return `M ${x1},${y}
            Q ${cx},${y+h} ${x2},${y}
            Q ${cx},${y+h*0.55} ${x1},${y} Z`;
  }
  function eyeSleep(cx, cy) {
    const w=90, h=16;
    return `M ${cx-w/2},${cy-h/2} L ${cx+w/2},${cy-h/2}
            L ${cx+w/2},${cy+h/2} L ${cx-w/2},${cy+h/2} Z`;
  }
  function eyeAngryL(cx, cy) {
    return `M ${cx-75},${cy-35} L ${cx+15},${cy-5}
            L ${cx+55},${cy-60} L ${cx-40},${cy-70} Z`;
  }
  function eyeAngryR(cx, cy) {
    return `M ${cx+75},${cy-35} L ${cx-15},${cy-5}
            L ${cx-55},${cy-60} L ${cx+40},${cy-70} Z`;
  }
  function eyeSurprised(cx, cy) {
    const rx=38, ry=64;
    return `M ${cx},${cy-ry}
            C ${cx+rx},${cy-ry} ${cx+rx},${cy+ry} ${cx},${cy+ry}
            C ${cx-rx},${cy+ry} ${cx-rx},${cy-ry} ${cx},${cy-ry} Z`;
  }

  function mouthDot(cx, y) {
    const w=36, h=14;
    return `M ${cx-w/2},${y-h/2} L ${cx+w/2},${y-h/2}
            L ${cx+w/2},${y+h/2} L ${cx-w/2},${y+h/2} Z`;
  }
  function mouthGrin(cx, y) {
    const w=320, h=150;
    const x1=cx-w/2, x2=cx+w/2, y1=y-55;
    return `M ${x1},${y1}
            Q ${cx},${y1+h} ${x2},${y1}
            Q ${cx},${y1+h*0.55} ${x1},${y1} Z`;
  }
  function mouthSmile(cx, y) {
    const w=260, h=140;
    const x1=cx-w/2, x2=cx+w/2, y1=y-40;
    return `M ${x1},${y1}
            Q ${cx},${y1+h} ${x2},${y1}
            Q ${cx},${y1+h*0.55} ${x1},${y1} Z`;
  }
  function mouthFrown(cx, y) {
    const w=260, h=130;
    const x1=cx-w/2, x2=cx+w/2, y1=y+45;
    return `M ${x1},${y1}
            Q ${cx},${y1-130} ${x2},${y1}
            Q ${cx},${y1-72} ${x1},${y1} Z`;
  }
  function mouthShout(cx, y) {
    const wTop=140, wBot=260, h=120;
    const x1=cx-wTop/2, x2=cx+wTop/2, x3=cx+wBot/2, x4=cx-wBot/2;
    const y1=y-35, y2=y+h-35;
    return `M ${x1},${y1} L ${x2},${y1} L ${x3},${y2} L ${x4},${y2} Z`;
  }

  // Speaking animation: scale mouth vertically (works for all)
  let speakTimer = null;
  function startSpeaking() {
    stopSpeaking();
    let open = false;
    const base = state.emotion === "excited" ? 85 : (state.emotion === "sleepy" ? 170 : 115);
    speakTimer = setInterval(() => {
      if (!state.speaking) return;
      open = !open;
      const amp = 0.10 + 0.18 * state.intensity;
      const sy = 1 + amp * (open ? 1 : -0.35);
      const ty = open ? 5 : 0;
      mouth.setAttribute("transform", `translate(0,${ty}) scale(1,${sy})`);
    }, base);
  }
  function stopSpeaking() {
    if (speakTimer) clearInterval(speakTimer);
    speakTimer = null;
    mouth.setAttribute("transform", "");
  }

  // Optional eye drift when no look is locked and eyesMoving true
  let driftTimer = null;
  function scheduleDrift(){
    clearTimeout(driftTimer);
    if (state.lookLock || !state.eyesMoving) return;

    const iconLocked = (state.emotion === "angry" || state.emotion === "happy" || state.emotion === "sleepy");
    if (iconLocked) return;

    state.look = {
      x: (Math.random()*2-1) * 0.5,
      y: (Math.random()*2-1) * 0.35
    };
    render();
    driftTimer = setTimeout(scheduleDrift, 900 + Math.random()*900);
  }

  function render(){
    // subtle look shift of eye group
    const lookX = clamp(state.look.x, -1, 1);
    const lookY = clamp(state.look.y, -1, 1);
    const iconLocked = (state.emotion === "angry" || state.emotion === "happy" || state.emotion === "sleepy");
    const scale = iconLocked ? 0.18 : 1.0;

    eyesGroup.setAttribute(
      "transform",
      `translate(${lookX * BASE.lookMaxPx * scale}, ${lookY * BASE.lookMaxPx * scale})`
    );

    setStickerStyle(eyeL, 6);
    setStickerStyle(eyeR, 6);
    setStickerStyle(mouth, 6);

    switch(state.emotion){
      case "angry":
        eyeL.setAttribute("d", eyeAngryL(BASE.L.x, BASE.L.y));
        eyeR.setAttribute("d", eyeAngryR(BASE.R.x, BASE.R.y));
        mouth.setAttribute("d", mouthShout(BASE.mouthCx, BASE.mouthY + 40));
        break;
      case "happy":
        eyeL.setAttribute("d", eyeHappy(BASE.L.x, BASE.L.y));
        eyeR.setAttribute("d", eyeHappy(BASE.R.x, BASE.R.y));
        mouth.setAttribute("d", mouthGrin(BASE.mouthCx, BASE.mouthY + 10));
        break;
      case "sleepy":
        eyeL.setAttribute("d", eyeSleep(BASE.L.x, BASE.L.y + 14));
        eyeR.setAttribute("d", eyeSleep(BASE.R.x, BASE.R.y + 14));
        mouth.setAttribute("d", mouthFrown(BASE.mouthCx, BASE.mouthY + 25));
        break;
      case "sad":
        eyeL.setAttribute("d", eyeSleep(BASE.L.x, BASE.L.y + 18));
        eyeR.setAttribute("d", eyeSleep(BASE.R.x, BASE.R.y + 18));
        mouth.setAttribute("d", mouthFrown(BASE.mouthCx, BASE.mouthY + 25));
        break;
      case "surprised":
        eyeL.setAttribute("d", eyeSurprised(BASE.L.x, BASE.L.y));
        eyeR.setAttribute("d", eyeSurprised(BASE.R.x, BASE.R.y));
        mouth.setAttribute("d", mouthShout(BASE.mouthCx, BASE.mouthY + 25));
        break;
      case "excited":
        eyeL.setAttribute("d", eyeSurprised(BASE.L.x, BASE.L.y));
        eyeR.setAttribute("d", eyeSurprised(BASE.R.x, BASE.R.y));
        mouth.setAttribute("d", mouthGrin(BASE.mouthCx, BASE.mouthY));
        break;
      default: // neutral
        eyeL.setAttribute("d", eyeOval(BASE.L.x, BASE.L.y));
        eyeR.setAttribute("d", eyeOval(BASE.R.x, BASE.R.y));
        mouth.setAttribute("d", mouthDot(BASE.mouthCx, BASE.mouthY + 35));
    }
  }

  // Public API
  window.applyFaceState = (payload) => {
    if (!payload || typeof payload !== "object") return;

    if (payload.intensity !== undefined) state.intensity = clamp01(payload.intensity);
    if (typeof payload.emotion === "string") state.emotion = EMOTIONS.has(payload.emotion) ? payload.emotion : "neutral";

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

    if (typeof payload.speaking === "boolean") state.speaking = payload.speaking;
    if (typeof payload.eyesMoving === "boolean") state.eyesMoving = payload.eyesMoving;

    render();
    if (state.speaking) startSpeaking(); else stopSpeaking();
    if (!state.lookLock) scheduleDrift();
  };

  // SSE /events
  (function connectSSE(){
    let es;
    function open(){
      es = new EventSource("/events");
      es.addEventListener("state", (ev) => {
        try { window.applyFaceState(JSON.parse(ev.data)); } catch (_) {}
      });
      es.onmessage = (ev) => {
        try { window.applyFaceState(JSON.parse(ev.data)); } catch (_) {}
      };
      es.onerror = () => {
        try { es.close(); } catch (_) {}
        setTimeout(open, 1200);
      };
    }
    open();
  })();

  // Init
  render();
  scheduleDrift();
})();