/* script_ar.js — AR PlayCanvas + GLB HuggingFace (GLB via config.json)
   - Lit config.json (data-config) => { "glb_url": "..." }
   - Hit-test AR (HORIZONTAUX uniquement) + placement + drag (XR)
   - Slider custom Yaw (360° en haut → 0° en bas), knob centré, rail plein
   - Blocage total des interactions scène quand on touche le slider
   - Éclairage PBR par défaut (sans WebXR light estimation)
   - Blob Shadow (ombre de contact) sous l’objet
*/

(function () {
  // ===== Récup config.json depuis data-config =====
  function findConfigUrl() {
    var el = document.currentScript || null;
    if (!el) {
      var scripts = document.getElementsByTagName('script');
      for (var i = scripts.length - 1; i >= 0; i--) {
        if (scripts[i].getAttribute && scripts[i].getAttribute('data-config')) {
          el = scripts[i];
          break;
        }
      }
    }
    if (!el) return null;
    var url = el.getAttribute('data-config');
    return url || null;
  }

  function timeout(ms) {
    return new Promise(function (_res, rej) {
      setTimeout(function () { rej(new Error("timeout")); }, ms);
    });
  }

  async function loadConfigJson(url) {
    if (!url) return null;
    try {
      var resp = await fetch(url, { cache: 'no-store' });
      if (!resp.ok) throw new Error("HTTP " + resp.status);
      var json = await resp.json();
      return json;
    } catch (e) {
      console.error("Erreur chargement config.json:", e);
      return null;
    }
  }

  // ===== PlayCanvas version fixée =====
  var PC_VERSION = "2.11.7";
  var PC_URLS = {
    esm: ["https://cdn.jsdelivr.net/npm/playcanvas@" + PC_VERSION + "/build/playcanvas.min.mjs"],
    umd: ["https://cdn.jsdelivr.net/npm/playcanvas@" + PC_VERSION + "/build/playcanvas.min.js"]
  };

  async function loadPlayCanvasRobust(opts) {
    opts = opts || {};
    var esmFirst = (typeof opts.esmFirst === "boolean") ? opts.esmFirst : true;
    var loadTimeoutMs = (typeof opts.loadTimeoutMs === "number") ? opts.loadTimeoutMs : 15000;

    if (window.pc && window.pc.Application) return window.pc;

    async function tryESM() {
      for (var i = 0; i < PC_URLS.esm.length; i++) {
        var url = PC_URLS.esm[i];
        try {
          var mod = await Promise.race([import(/* @vite-ignore */ url), timeout(loadTimeoutMs)]);
          var ns = (mod && (mod.pc || mod["default"])) || mod;
          if (ns && ns.Application) {
            if (!window.pc) window.pc = ns;
            return window.pc;
          }
        } catch (e) { /* continue */ }
      }
      throw new Error("ESM failed");
    }

    async function tryUMD() {
      for (var j = 0; j < PC_URLS.umd.length; j++) {
        var url2 = PC_URLS.umd[j];
        try {
          await Promise.race([
            new Promise(function (res, rej) {
              var s = document.createElement("script");
              s.src = url2;
              s.async = true;
              s.onload = function () { res(); };
              s.onerror = function () { rej(new Error("script error")); };
              document.head.appendChild(s);
            }),
            timeout(loadTimeoutMs)
          ]);
          if (window.pc && window.pc.Application) return window.pc;
        } catch (e) { /* continue */ }
      }
      throw new Error("UMD failed");
    }

    try {
      if (esmFirst) return await tryESM();
      return await tryUMD();
    } catch (e) {
      if (esmFirst) return await tryUMD();
      return await tryESM();
    }
  }

  // ===== UI / Overlay =====
  var css = [
    ".pc-ar-msg{position:fixed;left:50%;transform:translateX(-50%);bottom:16px;z-index:2;padding:10px 14px;background:rgba(0,0,0,.65);color:#fff;border-radius:12px;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:14px;line-height:1.3;text-align:center;max-width:min(90vw,640px);box-shadow:0 6px 20px rgba(0,0,0,.25);backdrop-filter:blur(4px);pointer-events:none}",
    "#xr-overlay-root{position:fixed;inset:0;z-index:9999;pointer-events:none}",

    ".ar-ui{position:absolute;right:12px;top:50%;transform:translateY(-50%);background:rgba(0,0,0,0.55);color:#fff;padding:12px 10px;border-radius:16px;width:56px;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;pointer-events:auto;display:flex;flex-direction:column;align-items:center;gap:8px;box-shadow:0 6px 18px rgba(0,0,0,.25);backdrop-filter:blur(6px);touch-action:none}",
    ".ar-ui .label{font-size:12px;text-align:center;opacity:.95}",
    ".rotY-wrap{position:relative;width:48px;height:200px;display:flex;align-items:center;justify-content:center;touch-action:none;overflow:visible;pointer-events:auto}",
    ".rotY-rail{position:absolute;left:50%;transform:translateX(-50%);width:4px;height:100%;background:rgba(255,255,255,.35);border-radius:2px;pointer-events:none}",
    ".rotY-knob{position:absolute;left:50%;width:22px;height:22px;border-radius:50%;background:#fff;box-shadow:0 2px 8px rgba(0,0,0,.35);transform:translate(-50%,-50%);top:50%;will-change:top;touch-action:none;pointer-events:none}",
    ".ar-ui input[type=\"range\"].rotY{position:absolute;opacity:0;pointer-events:none;width:0;height:0}",
    ".ar-ui .val{font-size:12px;opacity:.95}"
  ].join("\n");
  var styleTag = document.createElement("style");
  styleTag.textContent = css;
  document.head.appendChild(styleTag);

  function ensureOverlayRoot() {
    var r = document.getElementById("xr-overlay-root");
    if (!r) {
      r = document.createElement("div");
      r.id = "xr-overlay-root";
      document.body.appendChild(r);
    }
    return r;
  }
  var overlayRoot = ensureOverlayRoot();

  function message(msg) {
    var el = overlayRoot.querySelector(".pc-ar-msg");
    if (!el) {
      el = document.createElement("div");
      el.className = "pc-ar-msg";
      overlayRoot.appendChild(el);
    }
    el.textContent = msg;
  }

  function ensureCanvas() {
    var c = document.getElementById("application-canvas");
    if (!c) {
      c = document.createElement("canvas");
      c.id = "application-canvas";
      c.style.width = "100%";
      c.style.height = "100%";
      document.body.appendChild(c);
    }
    return c;
  }

  function ensureSliderUI() {
    var p = overlayRoot.querySelector(".ar-ui");
    if (p) return p;
    p = document.createElement("div");
    p.className = "ar-ui";
    p.innerHTML =
      '<div class="label">Rotation</div>' +
      '<div class="rotY-wrap" id="ar-rotY-wrap">' +
      '  <div class="rotY-rail"></div>' +
      '  <div class="rotY-knob" id="ar-rotY-knob"></div>' +
      '  <input class="rotY" id="ar-rotY" type="range" min="0" max="360" step="1" value="0"/>' +
      '</div>' +
      '<div class="val" id="ar-rotY-val">0°</div>';
    overlayRoot.appendChild(p);
    return p;
  }

  // ===== Boot : charge config.json => GLB_URL => PlayCanvas => App =====
  (async function () {
    // 1) Lire la config (glb_url)
    var cfgUrl = findConfigUrl();
    var cfg = await loadConfigJson(cfgUrl);
    var GLB_URL = (cfg && typeof cfg.glb_url === "string" && cfg.glb_url) ?
                  cfg.glb_url :
                  "https://huggingface.co/datasets/MikaFil/viewer_gs/resolve/main/AR/tests/danae_no_metallic.glb";

    // 2) Charger PlayCanvas
    try {
      await loadPlayCanvasRobust({ esmFirst: true, loadTimeoutMs: 15000 });
    } catch (e) {
      console.error("Chargement PlayCanvas échoué ->", e);
      message("Impossible de charger PlayCanvas (réseau/CDN). Réessaie plus tard.");
      return;
    }

    // 3) Lancer l'app avec l'URL lue
    initARApp(GLB_URL);
  })();

  // ===== App =====
  function initARApp(GLB_URL) {
    var pc = window.pc;
    var canvas = ensureCanvas();
    var ui = ensureSliderUI();
    var rotWrap = ui.querySelector("#ar-rotY-wrap");
    var rotKnob = ui.querySelector("#ar-rotY-knob");
    var rotYInput = ui.querySelector("#ar-rotY");
    var rotYVal = ui.querySelector("#ar-rotY-val");

    window.focus();

    var app = new pc.Application(canvas, {
      mouse: new pc.Mouse(canvas),
      touch: new pc.TouchDevice(canvas),
      keyboard: new pc.Keyboard(window),
      graphicsDeviceOptions: { alpha: true }
    });
    app.setCanvasFillMode(pc.FILLMODE_FILL_WINDOW);
    app.setCanvasResolution(pc.RESOLUTION_AUTO);
    app.graphicsDevice.maxPixelRatio = window.devicePixelRatio || 1;
    var onResize = function () { app.resizeCanvas(); };
    window.addEventListener("resize", onResize);
    app.on("destroy", function () { window.removeEventListener("resize", onResize); });
    app.start();

    // ===== Rendu / PBR defaults =====
    app.scene.gammaCorrection = pc.GAMMA_SRGB;
    app.scene.toneMapping = pc.TONEMAP_ACES;
    app.scene.exposure = 1;
    app.scene.ambientLight = new pc.Color(1, 1, 1);

    // Camera + lumière
    var camera = new pc.Entity("Camera");
    camera.addComponent("camera", { clearColor: new pc.Color(0, 0, 0, 0), farClip: 10000 });
    app.root.addChild(camera);

    var light = new pc.Entity("Light");
    light.addComponent("light", { type: "directional", intensity: 1.0, castShadows: true, color: new pc.Color(1, 1, 1) });
    light.setLocalEulerAngles(45, 30, 0);
    app.root.addChild(light);

    // Réticule
    var reticleMat = new pc.StandardMaterial();
    reticleMat.diffuse = new pc.Color(0.2, 0.8, 1.0);
    reticleMat.opacity = 0.85;
    reticleMat.blendType = pc.BLEND_NORMAL;
    reticleMat.update();

    var reticle = new pc.Entity("Reticle");
    reticle.addComponent("render", { type: "torus", material: reticleMat });
    reticle.setLocalScale(0.12, 0.005, 0.12);
    reticle.enabled = false;
    app.root.addChild(reticle);

    // Modèle
    var modelRoot = new pc.Entity("ModelRoot");
    modelRoot.enabled = false;
    app.root.addChild(modelRoot);
    var modelLoaded = false, placedOnce = false;

    // ===== Blob Shadow =====
    var blob = null;                    // entité plane de l’ombre
    var BLOB_SIZE = 0.4;
    var BLOB_OFFSET_Y = 0.005;

    function makeBlobTexture(app, size) {
      size = size || 256;
      var cvs = document.createElement('canvas');
      cvs.width = cvs.height = size;
      var ctx = cvs.getContext('2d');
      var r = size * 0.45;
      var grd = ctx.createRadialGradient(size/2, size/2, r*0.2, size/2, size/2, r);
      grd.addColorStop(0, 'rgba(0,0,0,0.5)'); // centre sombre
      grd.addColorStop(1, 'rgba(0,0,0,0.0)'); // bords transparents
      ctx.fillStyle = grd;
      ctx.fillRect(0, 0, size, size);

      var tex = new pc.Texture(app.graphicsDevice, {
        width: size,
        height: size,
        format: pc.PIXELFORMAT_R8_G8_B8_A8,
        mipmaps: true,
        magFilter: pc.FILTER_LINEAR,
        minFilter: pc.FILTER_LINEAR_MIPMAP_LINEAR
      });
      tex.setSource(cvs);
      return tex;
    }

    function createBlobShadowAt(pos, rot) {
      var tex = makeBlobTexture(app, 256);

      var blobMat = new pc.StandardMaterial();
      blobMat.diffuse = new pc.Color(0, 0, 0);
      blobMat.opacity = 1.0;
      blobMat.opacityMap = tex;              // utilise alpha pour la transparence
      blobMat.opacityMapChannel = 'a';
      blobMat.useLighting = false;
      blobMat.blendType = pc.BLEND_NORMAL;
      blobMat.depthWrite = false;
      blobMat.alphaTest = 0;
      blobMat.update();

      var e = new pc.Entity("BlobShadow");
      e.addComponent("render", { type: "plane", castShadows: false, receiveShadows: false });
      e.render.material = blobMat;

      e.setPosition(pos.x, pos.y + BLOB_OFFSET_Y, pos.z);
      e.setRotation(rot);
      e.setLocalScale(BLOB_SIZE, 1, BLOB_SIZE);

      app.root.addChild(e);
      return e;
    }

    // Euler base
    var baseEulerX = 0, baseEulerZ = 0;

    // Rotation via slider
    var rotationYDeg = 0;
    function clamp360(d) { return Math.max(0, Math.min(360, d)); }

    function updateKnobFromY(yDeg) {
      var t = 1 - (yDeg / 360);
      rotKnob.style.top = String(t * 100) + "%";
      rotYInput.value = String(Math.round(yDeg));
      rotYVal.textContent = String(Math.round(yDeg)) + "°";
    }
    function applyRotationY(deg) {
      var y = clamp360(deg);
      rotationYDeg = y;
      modelRoot.setEulerAngles(baseEulerX, y, baseEulerZ);
      updateKnobFromY(y);
    }

    function updateBlobPositionUnder(pos, rotLikePlane) {
      if (!blob) return;
      blob.setPosition(pos.x, pos.y + BLOB_OFFSET_Y, pos.z);
      if (rotLikePlane) blob.setRotation(rotLikePlane);
    }

    // Chargement GLB (depuis config.json)
    app.assets.loadFromUrl(GLB_URL, "container", function (err, asset) {
      if (err) { console.error(err); message("Échec du chargement du modèle GLB."); return; }
      var instance = asset.resource.instantiateRenderEntity({ castShadows: true, receiveShadows: false });
      modelRoot.addChild(instance);
      modelRoot.setLocalScale(1, 1, 1);

      // Fix matériaux (anti-objets trop sombres)
      var renders = instance.findComponents('render');
      for (var ri = 0; ri < renders.length; ri++) {
        var r = renders[ri];
        r.castShadows = true;
        for (var mi = 0; mi < r.meshInstances.length; mi++) {
          var mat = r.meshInstances[mi].material;
          if (!mat) continue;
          if (mat.diffuse && (mat.diffuse.r !== 1 || mat.diffuse.g !== 1 || mat.diffuse.b !== 1)) {
            mat.diffuse.set(1, 1, 1);
          }
          if (typeof mat.useSkybox !== "undefined") mat.useSkybox = true;
          mat.update();
        }
      }

      var initE = modelRoot.getEulerAngles();
      baseEulerX = initE.x; baseEulerZ = initE.z;

      modelLoaded = true;
      message("Modèle chargé. Touchez l’écran pour démarrer l’AR.");
    });

    if (!app.xr.supported) { message("WebXR n’est pas supporté sur cet appareil."); return; }

    // ===== Slider fiable : Pointer Events en CAPTURE =====
    var uiInteracting = false;
    var draggingWrap = false;
    var activePointerId = null;

    function insideWrap(target) { return rotWrap.contains(target); }
    function degFromPointer(e) {
      var rect = rotWrap.getBoundingClientRect();
      var y = (e.clientY != null) ? e.clientY : ((e.touches && e.touches[0] && e.touches[0].clientY) || 0);
      var ratio = (y - rect.top) / rect.height;
      var t = Math.max(0, Math.min(1, ratio));
      return (1 - t) * 360;
    }

    function onPointerDownCapture(e) {
      if (!insideWrap(e.target)) return;
      uiInteracting = true;
      draggingWrap = true;
      activePointerId = (e.pointerId != null) ? e.pointerId : 1;
      if (rotWrap.setPointerCapture) {
        try { rotWrap.setPointerCapture(activePointerId); } catch (er) {}
      }
      applyRotationY(degFromPointer(e));
      e.preventDefault();
      e.stopPropagation();
    }
    function onPointerMoveCapture(e) {
      if (!draggingWrap || ((e.pointerId != null ? e.pointerId : 1) !== activePointerId)) return;
      applyRotationY(degFromPointer(e));
      e.preventDefault();
      e.stopPropagation();
    }
    function endDrag(e) {
      if (!draggingWrap || ((e.pointerId != null ? e.pointerId : 1) !== activePointerId)) return;
      draggingWrap = false;
      uiInteracting = false;
      if (rotWrap.releasePointerCapture) {
        try { rotWrap.releasePointerCapture(activePointerId); } catch (er) {}
      }
      activePointerId = null;
      e.preventDefault();
      e.stopPropagation();
    }

    document.addEventListener("pointerdown", onPointerDownCapture, { capture: true, passive: false });
    document.addEventListener("pointermove", onPointerMoveCapture, { capture: true, passive: false });
    document.addEventListener("pointerup", endDrag, { capture: true, passive: false });
    document.addEventListener("pointercancel", endDrag, { capture: true, passive: false });

    // --- Démarrage AR
    function activateAR() {
      if (!app.xr.isAvailable(pc.XRTYPE_AR)) { message("AR immersive indisponible sur cet appareil."); return; }
      if (!app.xr.domOverlay) app.xr.domOverlay = {};
      app.xr.domOverlay.root = document.getElementById("xr-overlay-root");
      camera.camera.startXr(pc.XRTYPE_AR, pc.XRSPACE_LOCALFLOOR, {
        requiredFeatures: ["hit-test", "dom-overlay"],
        domOverlay: { root: app.xr.domOverlay.root },
        callback: function (err) {
          if (err) {
            console.error("Échec du démarrage AR :", err);
            message("Échec du démarrage AR : " + (err.message || err));
          }
        }
      });
    }
    app.mouse.on("mousedown", function () { if (!app.xr.active && !uiInteracting) activateAR(); });
    if (app.touch) {
      app.touch.on("touchend", function (evt) {
        if (!app.xr.active && !uiInteracting) activateAR();
        evt.event.preventDefault();
        evt.event.stopPropagation();
      });
    }
    app.keyboard.on("keydown", function (evt) { if (evt.key === pc.KEY_ESCAPE && app.xr.active) app.xr.end(); });

    // ====== Filtre HORIZONTAL uniquement ======
    var TMP_IN = new pc.Vec3(0, 1, 0), TMP_OUT = new pc.Vec3();
    function isHorizontalUpFacing(rot, minDot) {
      minDot = (typeof minDot === "number") ? minDot : 0.75;
      rot.transformVector(TMP_IN, TMP_OUT);
      return TMP_OUT.y >= minDot;
    }

    // Hit Test global (réticule + 1er placement)
    app.xr.hitTest.on("available", function () {
      app.xr.hitTest.start({
        entityTypes: [pc.XRTRACKABLE_POINT, pc.XRTRACKABLE_PLANE],
        callback: function (err, hitSource) {
          if (err) { message("Le AR hit test n’a pas pu démarrer."); return; }
          hitSource.on("result", function (pos, rot) {
            if (!isHorizontalUpFacing(rot)) return;

            reticle.enabled = true;
            reticle.setPosition(pos);
            reticle.setRotation(rot);

            if (modelLoaded && !placedOnce) {
              modelRoot.enabled = true;
              modelRoot.setPosition(pos);

              // Ombre de contact au placement initial
              blob = createBlobShadowAt(pos, rot);

              var e = new pc.Vec3();
              rot.getEulerAngles(e);
              var y0 = ((e.y % 360) + 360) % 360;
              applyRotationY(y0);

              placedOnce = true;
              rotYInput.disabled = false;
              message("Objet placé. Glissez pour déplacer, tournez-le avec le slider →");
            }
          });
        }
      });
    });

    // Déplacement XR (drag) — ignoré si UI active
    var isDragging = false;
    app.xr.input.on("add", function (inputSource) {
      inputSource.on("selectstart", function () {
        if (uiInteracting) return;
        if (!placedOnce || !modelLoaded) return;

        inputSource.hitTestStart({
          entityTypes: [pc.XRTRACKABLE_POINT, pc.XRTRACKABLE_PLANE],
          callback: function (err, transientSource) {
            if (err) return;
            isDragging = true;

            transientSource.on("result", function (pos, rot) {
              if (!isDragging) return;
              if (!isHorizontalUpFacing(rot)) return;
              modelRoot.setPosition(pos);
              updateBlobPositionUnder(pos, rot);
            });

            transientSource.once("remove", function () { isDragging = false; });
          }
        });
      });
      inputSource.on("selectend", function () { isDragging = false; });
    });

    // Desktop : rotation souris (ignore si UI)
    var rotateMode = false, lastMouseX = 0;
    var ROTATE_SENSITIVITY = 0.25;
    app.mouse.on("mousedown", function (e) {
      if (!app.xr.active || !placedOnce || uiInteracting) return;
      if (e.button === 0 && !e.shiftKey) {
        isDragging = true;
      } else if (e.button === 2 || (e.button === 0 && e.shiftKey)) {
        rotateMode = true;
        lastMouseX = e.x;
      }
    });
    app.mouse.on("mousemove", function (e) {
      if (!app.xr.active || !placedOnce || uiInteracting) return;
      if (isDragging) {
        if (reticle.enabled) {
          var p = reticle.getPosition();
          modelRoot.setPosition(p);
          updateBlobPositionUnder(p, null);
        }
      } else if (rotateMode && modelRoot.enabled) {
        var dx = e.x - lastMouseX;
        lastMouseX = e.x;
        applyRotationY(rotationYDeg + dx * ROTATE_SENSITIVITY);
      }
    });
    app.mouse.on("mouseup", function () { isDragging = false; rotateMode = false; });
    window.addEventListener("contextmenu", function (e) { e.preventDefault(); });

    // Slider (accessibilité clavier)
    rotYInput.disabled = true;
    rotYInput.addEventListener("input", function (e) {
      if (!modelRoot.enabled) return;
      var v = parseFloat(e.target.value || "0");
      applyRotationY(v);
    }, { passive: true });

    // AR events
    app.xr.on("start", function () { message("Session AR démarrée. Visez le sol pour détecter un plan…"); reticle.enabled = true; });
    app.xr.on("end", function () { message("Session AR terminée."); reticle.enabled = false; isDragging = false; rotateMode = false; rotYInput.disabled = true; });
    app.xr.on("available:" + pc.XRTYPE_AR, function (a) {
      if (!a) message("AR immersive indisponible.");
      else if (!app.xr.hitTest.supported) message("AR Hit Test non supporté.");
      else message(modelLoaded ? "Touchez l’écran pour démarrer l’AR." : "Chargement du modèle…");
    });

    if (!app.xr.isAvailable(pc.XRTYPE_AR)) message("AR immersive indisponible.");
    else if (!app.xr.hitTest.supported) message("AR Hit Test non supporté.");
    else message("Chargement du modèle…");
  }
})();