// viewer.js
// ==============================

/* -------------------------------------------
   Utils
-------------------------------------------- */

// (Conservé pour compat, même si .sog n'en a pas besoin)
async function loadImageAsTexture(url, app) {
  return new Promise((resolve, reject) => {
    const img = new window.Image();
    img.crossOrigin = "anonymous";
    img.onload = function () {
      const tex = new pc.Texture(app.graphicsDevice, {
        width: img.width,
        height: img.height,
        format: pc.PIXELFORMAT_R8_G8_B8_A8
      });
      tex.setSource(img);
      resolve(tex);
    };
    img.onerror = reject;
    img.src = url;
  });
}

// Patch global Image -> force CORS
(function () {
  const OriginalImage = window.Image;
  window.Image = function (...args) {
    const img = new OriginalImage(...args);
    img.crossOrigin = "anonymous";
    return img;
  };
})();

function hexToRgbaArray(hex) {
  try {
    hex = String(hex || "").replace("#", "");
    if (hex.length === 6) hex += "FF";
    if (hex.length !== 8) return [1, 1, 1, 1];
    const num = parseInt(hex, 16);
    return [
      ((num >> 24) & 0xff) / 255,
      ((num >> 16) & 0xff) / 255,
      ((num >> 8) & 0xff) / 255,
      (num & 0xff) / 255
    ];
  } catch (e) {
    console.warn("hexToRgbaArray error:", e);
    return [1, 1, 1, 1];
  }
}

// Parcours récursif d'une hiérarchie d'entités
function traverse(entity, callback) {
  callback(entity);
  if (entity.children) {
    entity.children.forEach((child) => traverse(child, callback));
  }
}

/* -------------------------------------------
   Chargement unique de orbit-camera.js
-------------------------------------------- */

async function ensureOrbitScriptsLoaded() {
  if (window.__PLY_ORBIT_LOADED__) return;
  if (window.__PLY_ORBIT_LOADING__) {
    await window.__PLY_ORBIT_LOADING__;
    return;
  }

  window.__PLY_ORBIT_LOADING__ = new Promise((resolve, reject) => {
    const s = document.createElement("script");
    s.src = "https://mikafil-viewer-sgos.static.hf.space/orbit-camera.js";
    s.async = true;
    s.onload = () => {
      window.__PLY_ORBIT_LOADED__ = true;
      resolve();
    };
    s.onerror = (e) => {
      console.error("[viewer.js] Failed to load orbit-camera.js", e);
      reject(e);
    };
    document.head.appendChild(s);
  });

  await window.__PLY_ORBIT_LOADING__;
}

/* -------------------------------------------
   State (par module = par instance importée)
-------------------------------------------- */

let pc;
export let app = null;
let cameraEntity = null;
let modelEntity = null;
let viewerInitialized = false;
let resizeObserver = null;
let resizeTimeout = null;

// paramètres courants de l'instance
let chosenCameraX, chosenCameraY, chosenCameraZ;
let minZoom, maxZoom, minAngle, maxAngle, minAzimuth, maxAzimuth, minY;
let modelX, modelY, modelZ, modelScale, modelRotationX, modelRotationY, modelRotationZ;
let presentoirScaleX, presentoirScaleY, presentoirScaleZ;
let sogUrl, glbUrl, presentoirUrl;
let color_bg_hex, color_bg, espace_expo_bool;

// perf dynamique
let maxDevicePixelRatio = 1.75;   // plafond par défaut (configurable)
let interactDpr = 1.0;            // DPR pendant interaction
let idleRestoreDelay = 350;       // ms avant de restaurer le DPR
let idleTimer = null;

/* -------------------------------------------
   Initialisation
-------------------------------------------- */

export async function initializeViewer(config, instanceId) {
  if (viewerInitialized) return;

  const isIOS = /iPad|iPhone|iPod/.test(navigator.userAgent);
  const isMobile = isIOS || /Android/i.test(navigator.userAgent);

  // --- Configuration ---
  // Nouveau format .sog (et compat si seul sogs_json_url est présent)
  sogUrl = config.sog_url || config.sogs_json_url;

  glbUrl =
    config.glb_url !== undefined
      ? config.glb_url
      : "https://huggingface.co/datasets/MikaFil/viewer_gs/resolve/main/ressources/espace_expo/sol_blanc_2.glb";

  presentoirUrl =
    config.presentoir_url !== undefined
      ? config.presentoir_url
      : "https://huggingface.co/datasets/MikaFil/viewer_gs/resolve/main/ressources/espace_expo/sol_blanc_2.glb";

  minZoom = parseFloat(config.minZoom || "1");
  maxZoom = parseFloat(config.maxZoom || "20");
  minAngle = parseFloat(config.minAngle || "-2000");
  maxAngle = parseFloat(config.maxAngle || "2000");
  minAzimuth = config.minAzimuth !== undefined ? parseFloat(config.minAzimuth) : -360;
  maxAzimuth = config.maxAzimuth !== undefined ? parseFloat(config.maxAzimuth) : 360;
  minY = config.minY !== undefined ? parseFloat(config.minY) : 0;

  modelX = config.modelX !== undefined ? parseFloat(config.modelX) : 0;
  modelY = config.modelY !== undefined ? parseFloat(config.modelY) : 0;
  modelZ = config.modelZ !== undefined ? parseFloat(config.modelZ) : 0;
  modelScale = config.modelScale !== undefined ? parseFloat(config.modelScale) : 1;
  modelRotationX = config.modelRotationX !== undefined ? parseFloat(config.modelRotationX) : 0;
  modelRotationY = config.modelRotationY !== undefined ? parseFloat(config.modelRotationY) : 0;
  modelRotationZ = config.modelRotationZ !== undefined ? parseFloat(config.modelRotationZ) : 0;

  presentoirScaleX = config.presentoirScaleX !== undefined ? parseFloat(config.presentoirScaleX) : 0;
  presentoirScaleY = config.presentoirScaleY !== undefined ? parseFloat(config.presentoirScaleY) : 0;
  presentoirScaleZ = config.presentoirScaleZ !== undefined ? parseFloat(config.presentoirScaleZ) : 0;

  const cameraX = config.cameraX !== undefined ? parseFloat(config.cameraX) : 0;
  const cameraY = config.cameraY !== undefined ? parseFloat(config.cameraY) : 2;
  const cameraZ = config.cameraZ !== undefined ? parseFloat(config.cameraZ) : 5;

  const cameraXPhone = config.cameraXPhone !== undefined ? parseFloat(config.cameraXPhone) : cameraX;
  const cameraYPhone = config.cameraYPhone !== undefined ? parseFloat(config.cameraYPhone) : cameraY;
  const cameraZPhone = config.cameraZPhone !== undefined ? parseFloat(config.cameraZPhone) : cameraZ * 1.5;

  color_bg_hex = config.canvas_background !== undefined ? config.canvas_background : "#FFFFFF";
  espace_expo_bool = config.espace_expo_bool !== undefined ? config.espace_expo_bool : false;
  color_bg = hexToRgbaArray(color_bg_hex);

  chosenCameraX = isMobile ? cameraXPhone : cameraX;
  chosenCameraY = isMobile ? cameraYPhone : cameraY;
  chosenCameraZ = isMobile ? cameraZPhone : cameraZ;

  // Options perf configurables
  if (config.maxDevicePixelRatio !== undefined) {
    maxDevicePixelRatio = Math.max(0.75, parseFloat(config.maxDevicePixelRatio) || maxDevicePixelRatio);
  }
  if (config.interactionPixelRatio !== undefined) {
    interactDpr = Math.max(0.75, parseFloat(config.interactionPixelRatio) || interactDpr);
  }
  if (config.idleRestoreDelayMs !== undefined) {
    idleRestoreDelay = Math.max(120, parseInt(config.idleRestoreDelayMs, 10) || idleRestoreDelay);
  }

  // --- Prépare le canvas unique à cette instance ---
  const canvasId = "canvas-" + instanceId;
  const progressDialog = document.getElementById("progress-dialog-" + instanceId);
  const viewerContainer = document.getElementById("viewer-container-" + instanceId);

  const old = document.getElementById(canvasId);
  if (old) old.remove();

  const canvas = document.createElement("canvas");
  canvas.id = canvasId;
  canvas.className = "ply-canvas";
  canvas.style.width = "100%";
  canvas.style.height = "100%";
  canvas.setAttribute("tabindex", "0");
  viewerContainer.insertBefore(canvas, progressDialog);

  // interactions de base
  canvas.style.touchAction = "none";
  canvas.style.webkitTouchCallout = "none";
  canvas.addEventListener("gesturestart", (e) => e.preventDefault());
  canvas.addEventListener("gesturechange", (e) => e.preventDefault());
  canvas.addEventListener("gestureend", (e) => e.preventDefault());
  canvas.addEventListener("dblclick", (e) => e.preventDefault());
  canvas.addEventListener(
    "touchstart",
    (e) => {
      if (e.touches.length > 1) e.preventDefault();
    },
    { passive: false }
  );
  canvas.addEventListener(
    "wheel",
    (e) => {
      e.preventDefault();
    },
    { passive: false }
  );

  // Bloque le scroll page uniquement quand le pointeur est sur le canvas
  const scrollKeys = new Set([
    "ArrowUp",
    "ArrowDown",
    "ArrowLeft",
    "ArrowRight",
    "PageUp",
    "PageDown",
    "Home",
    "End",
    " ",
    "Space",
    "Spacebar"
  ]);
  let isPointerOverCanvas = false;
  const focusCanvas = () => canvas.focus({ preventScroll: true });

  const onPointerEnter = () => {
    isPointerOverCanvas = true;
    focusCanvas();
  };
  const onPointerLeave = () => {
    isPointerOverCanvas = false;
    if (document.activeElement === canvas) canvas.blur();
  };
  const onCanvasBlur = () => {
    isPointerOverCanvas = false;
  };

  canvas.addEventListener("pointerenter", onPointerEnter);
  canvas.addEventListener("pointerleave", onPointerLeave);
  canvas.addEventListener("mouseenter", onPointerEnter);
  canvas.addEventListener("mouseleave", onPointerLeave);
  canvas.addEventListener("mousedown", focusCanvas);
  canvas.addEventListener(
    "touchstart",
    () => {
      focusCanvas();
    },
    { passive: false }
  );
  canvas.addEventListener("blur", onCanvasBlur);

  const onKeyDownCapture = (e) => {
    if (!isPointerOverCanvas) return;
    if (scrollKeys.has(e.key) || scrollKeys.has(e.code)) {
      e.preventDefault();
    }
  };
  window.addEventListener("keydown", onKeyDownCapture, true);

  progressDialog.style.display = "block";

  // --- Charge PlayCanvas lib ESM (une par module/instance) ---
  if (!pc) {
    pc = await import("https://esm.run/playcanvas");
    window.pc = pc; // utiles pour tooltips.js
  }

  // --- Crée l'Application ---
  const device = await pc.createGraphicsDevice(canvas, {
    deviceTypes: ["webgl2"],
    glslangUrl: "https://playcanvas.vercel.app/static/lib/glslang/glslang.js",
    twgslUrl: "https://playcanvas.vercel.app/static/lib/twgsl/twgsl.js",
    antialias: false
  });

  // Cap DPR pour limiter le coût CPU/GPU
  device.maxPixelRatio = Math.min(window.devicePixelRatio || 1, maxDevicePixelRatio);

  const opts = new pc.AppOptions();
  opts.graphicsDevice = device;
  opts.mouse = new pc.Mouse(canvas);
  opts.touch = new pc.TouchDevice(canvas);
  opts.keyboard = new pc.Keyboard(canvas);
  opts.componentSystems = [
    pc.RenderComponentSystem,
    pc.CameraComponentSystem,
    pc.LightComponentSystem,
    pc.ScriptComponentSystem,
    pc.GSplatComponentSystem,
    pc.CollisionComponentSystem,
    pc.RigidbodyComponentSystem
  ];
  // GSplatHandler gère nativement les .sog
  opts.resourceHandlers = [pc.TextureHandler, pc.ContainerHandler, pc.ScriptHandler, pc.GSplatHandler];

  app = new pc.Application(canvas, opts);
  app.setCanvasFillMode(pc.FILLMODE_NONE);
  app.setCanvasResolution(pc.RESOLUTION_AUTO);

  // --- Debounce resize (moins de rafales) ---
  resizeObserver = new ResizeObserver((entries) => {
    if (!entries || !entries.length) return;
    if (resizeTimeout) clearTimeout(resizeTimeout);
    resizeTimeout = setTimeout(() => {
      app.resizeCanvas(entries[0].contentRect.width, entries[0].contentRect.height);
    }, 60);
  });
  resizeObserver.observe(viewerContainer);

  window.addEventListener("resize", () => {
    if (resizeTimeout) clearTimeout(resizeTimeout);
    resizeTimeout = setTimeout(() => {
      app.resizeCanvas(viewerContainer.clientWidth, viewerContainer.clientHeight);
    }, 60);
  });

  // Nettoyage complet
  app.on("destroy", () => {
    try {
      resizeObserver.disconnect();
    } catch {}
    if (opts.keyboard && opts.keyboard.detach) opts.keyboard.detach();
    window.removeEventListener("keydown", onKeyDownCapture, true);

    canvas.removeEventListener("pointerenter", onPointerEnter);
    canvas.removeEventListener("pointerleave", onPointerLeave);
    canvas.removeEventListener("mouseenter", onPointerEnter);
    canvas.removeEventListener("mouseleave", onPointerLeave);
    canvas.removeEventListener("mousedown", focusCanvas);
    canvas.removeEventListener("touchstart", focusCanvas);
    canvas.removeEventListener("blur", onCanvasBlur);
  });

  // --- Enregistre les assets en 2 phases ---
  // Phase 1 : .sog (priorité) ⇒ time-to-first-pixel
  const sogAsset = new pc.Asset("gsplat", "gsplat", { url: sogUrl });
  app.assets.add(sogAsset);

  // Phase 2 (déférée) : glb + présentoir
  const glbAsset = new pc.Asset("glb", "container", { url: glbUrl });
  const presentoirAsset = new pc.Asset("presentoir", "container", { url: presentoirUrl });
  app.assets.add(glbAsset);
  app.assets.add(presentoirAsset);

  // Assure orbit-camera.js (nécessaire pour les scripts d'input)
  await ensureOrbitScriptsLoaded();

  // ---------- PHASE 1 : charger le .sog, démarrer tout de suite ----------
  await new Promise((resolve, reject) => {
    const loader1 = new pc.AssetListLoader([sogAsset], app.assets);
    loader1.load(() => resolve());
    loader1.on('error', reject);
  });

  app.start(); // démarre l'update loop le plus tôt possible
  progressDialog.style.display = "none";

  // --- Modèle principal (GSplat via .sog) ---
  modelEntity = new pc.Entity("model");
  modelEntity.addComponent("gsplat", { asset: sogAsset });
  modelEntity.setLocalPosition(modelX, modelY, modelZ);
  modelEntity.setLocalEulerAngles(modelRotationX, modelRotationY, modelRotationZ);
  modelEntity.setLocalScale(modelScale, modelScale, modelScale);
  app.root.addChild(modelEntity);

  // --- Caméra + scripts d’input ---
  cameraEntity = new pc.Entity("camera");
  cameraEntity.addComponent("camera", {
    clearColor: new pc.Color(color_bg),
    nearClip: 0.001,
    farClip: 100
  });
  cameraEntity.setPosition(chosenCameraX, chosenCameraY, chosenCameraZ);
  cameraEntity.lookAt(modelEntity.getPosition());
  cameraEntity.addComponent("script");

  cameraEntity.script.create("orbitCamera", {
    attributes: {
      focusEntity: modelEntity,
      inertiaFactor: 0.2,
      distanceMax: maxZoom,
      distanceMin: minZoom,
      pitchAngleMax: maxAngle,
      pitchAngleMin: minAngle,
      yawAngleMax: maxAzimuth,
      yawAngleMin: minAzimuth,
      minY: minY,
      frameOnStart: false
    }
  });
  cameraEntity.script.create("orbitCameraInputMouse");
  cameraEntity.script.create("orbitCameraInputTouch");
  cameraEntity.script.create("orbitCameraInputKeyboard", {
    attributes: {
      forwardSpeed: 1.2,
      strafeSpeed: 1.2
    }
  });
  app.root.addChild(cameraEntity);

  // Taille initiale
  app.resizeCanvas(viewerContainer.clientWidth, viewerContainer.clientHeight);
  app.once("update", () => resetViewerCamera());

  // ---------- Perf dynamique : DPR temporairement réduit pendant interaction ----------
  const setDpr = (val) => {
    const clamped = Math.max(0.5, Math.min(val, maxDevicePixelRatio));
    if (app.graphicsDevice.maxPixelRatio !== clamped) {
      app.graphicsDevice.maxPixelRatio = clamped;
      // Force un resize pour appliquer immédiatement
      app.resizeCanvas(viewerContainer.clientWidth, viewerContainer.clientHeight);
    }
  };

  const bumpInteraction = () => {
    // baisse DPR pendant l'interaction
    setDpr(interactDpr);
    if (idleTimer) clearTimeout(idleTimer);
    idleTimer = setTimeout(() => {
      // restaure DPR max quand l'utilisateur s'arrête
      setDpr(Math.min(window.devicePixelRatio || 1, maxDevicePixelRatio));
    }, idleRestoreDelay);
  };

  // Hooks d'interaction
  const interactionEvents = ["mousedown", "mousemove", "mouseup", "wheel", "touchstart", "touchmove", "keydown"];
  interactionEvents.forEach((ev) => {
    canvas.addEventListener(ev, bumpInteraction, { passive: true });
  });

  // ---------- PHASE 2 (déférée) : charger sol/environnement et tooltips ----------
  // On charge le reste sans bloquer l’affichage initial
  setTimeout(async () => {
    try {
      await new Promise((resolve) => {
        const loader2 = new pc.AssetListLoader([glbAsset, presentoirAsset], app.assets);
        loader2.load(() => resolve());
      });

      // Sol / environnement
      const glbEntity = glbAsset.resource ? glbAsset.resource.instantiateRenderEntity() : null;
      if (glbEntity) {
        app.root.addChild(glbEntity);
      }

      const presentoirEntity =
        presentoirAsset.resource ? presentoirAsset.resource.instantiateRenderEntity() : null;
      if (presentoirEntity) {
        presentoirEntity.setLocalScale(presentoirScaleX, presentoirScaleY, presentoirScaleZ);
        app.root.addChild(presentoirEntity);
      }

      if (!espace_expo_bool) {
        const matSol = new pc.StandardMaterial();
        matSol.blendType = pc.BLEND_NONE;
        matSol.emissive = new pc.Color(color_bg);
        matSol.emissiveIntensity = 1;
        matSol.useLighting = false;
        matSol.update();

        if (presentoirEntity) {
          traverse(presentoirEntity, (node) => {
            if (node.render && node.render.meshInstances) {
              for (const mi of node.render.meshInstances) mi.material = matSol;
            }
          });
        }

        if (glbEntity) {
          traverse(glbEntity, (node) => {
            if (node.render && node.render.meshInstances) {
              for (const mi of node.render.meshInstances) mi.material = matSol;
            }
          });

          // ////// MODIFIE A LA MANO FAIRE GAFFE //////
          glbEntity.setLocalScale(10, 10, 10);
        }
      }

      // Tooltips (optionnels) — chargés après premier rendu
      try {
        if (config.tooltips_url) {
          import("./tooltips.js")
            .then((tooltipsModule) => {
              tooltipsModule.initializeTooltips({
                app,
                cameraEntity,
                modelEntity,
                tooltipsUrl: config.tooltips_url,
                defaultVisible: !!config.showTooltipsDefault,
                moveDuration: config.tooltipMoveDuration || 0.6
              });
            })
            .catch(() => { /* optional */ });
        }
      } catch (e) { /* optional */ }
    } catch (e) {
      console.warn("[viewer.js] Deferred assets load failed:", e);
    }
  }, 0);

  viewerInitialized = true;
}

/* -------------------------------------------
   Reset caméra (API)
-------------------------------------------- */

export function resetViewerCamera() {
  try {
    if (!cameraEntity || !modelEntity || !app) return;
    const orbitCam = cameraEntity.script.orbitCamera;
    if (!orbitCam) return;

    const modelPos = modelEntity.getPosition();
    const tempEnt = new pc.Entity();
    tempEnt.setPosition(chosenCameraX, chosenCameraY, chosenCameraZ);
    tempEnt.lookAt(modelPos);

    const dist = new pc.Vec3()
      .sub2(new pc.Vec3(chosenCameraX, chosenCameraY, chosenCameraZ), modelPos)
      .length();

    cameraEntity.setPosition(chosenCameraX, chosenCameraY, chosenCameraZ);
    cameraEntity.lookAt(modelPos);

    orbitCam.pivotPoint = modelPos.clone();
    orbitCam._targetDistance = dist;
    orbitCam._distance = dist;

    const rot = tempEnt.getRotation();
    const fwd = new pc.Vec3();
    rot.transformVector(pc.Vec3.FORWARD, fwd);

    const yaw = Math.atan2(-fwd.x, -fwd.z) * pc.math.RAD_TO_DEG;
    const yawQuat = new pc.Quat().setFromEulerAngles(0, -yaw, 0);
    const rotNoYaw = new pc.Quat().mul2(yawQuat, rot);
    const fNoYaw = new pc.Vec3();
    rotNoYaw.transformVector(pc.Vec3.FORWARD, fNoYaw);
    const pitch = Math.atan2(fNoYaw.y, -fNoYaw.z) * pc.math.RAD_TO_DEG;

    orbitCam._targetYaw = yaw;
    orbitCam._yaw = yaw;
    orbitCam._targetPitch = pitch;
    orbitCam._pitch = pitch;
    if (orbitCam._updatePosition) orbitCam._updatePosition();

    tempEnt.destroy();
  } catch (e) {
    console.error("[viewer.js] resetViewerCamera error:", e);
  }
}