// ============================================================
// js/vendor/OrbitControls.js — eigen, compacte vervanging van de officiële
// three.js OrbitControls-addon. Geschreven omdat we geen netwerktoegang
// hebben om het origineel te vendoren; dekt precies de subset die wall.js
// gebruikt (`new THREE.OrbitControls(camera, domElement)`,
// `controls.target.set(...)`, `controls.update()`), plus interactie:
// links-slepen = roteren, scrollwiel = zoomen, rechts-slepen = pannen;
// touch: één vinger = roteren, twee vingers = knijpen (zoomen) en samen schuiven (pannen).
//
// Moet NA three.min.js geladen worden (leunt op window.THREE).
// ============================================================
(function () {
  if (typeof THREE === 'undefined') {
    console.error('OrbitControls.js (eigen versie): THREE is niet geladen — controleer de scriptvolgorde.');
    return;
  }

  function OrbitControls(camera, domElement) {
    const scope = this;
    this.object = camera;
    this.domElement = domElement || document;
    this.target = new THREE.Vector3();

    this.minDistance = 0.1;
    this.maxDistance = 1000;
    this.minPolarAngle = 0.001;
    this.maxPolarAngle = Math.PI - 0.001;
    this.rotateSpeed = 1.0;
    this.zoomSpeed = 1.0;
    this.panSpeed = 1.0;
    this.enableRotate = true;
    this.enableZoom = true;
    this.enablePan = true;

    const offset = new THREE.Vector3();
    const spherical = new THREE.Spherical();
    let isRotating = false;
    let isPanning = false;
    let lastX = 0, lastY = 0;

    function getZoomScale() { return Math.pow(0.95, scope.zoomSpeed); }

    this.update = function () {
      offset.copy(scope.object.position).sub(scope.target);
      spherical.setFromVector3(offset);
      offset.setFromSpherical(spherical);
      scope.object.position.copy(scope.target).add(offset);
      scope.object.lookAt(scope.target);
      return true;
    };

    function onPointerDown(event) {
      if (event.button === 2) {
        if (!scope.enablePan) return;
        isPanning = true;
      } else {
        if (!scope.enableRotate) return;
        isRotating = true;
      }
      lastX = event.clientX;
      lastY = event.clientY;
    }

    function rotate(dx, dy) {
        const w = scope.domElement.clientWidth || 1;
        const h = scope.domElement.clientHeight || 1;

        offset.copy(scope.object.position).sub(scope.target);
        spherical.setFromVector3(offset);
        spherical.theta -= (dx / w) * Math.PI * scope.rotateSpeed;
        spherical.phi -= (dy / h) * Math.PI * scope.rotateSpeed;
        spherical.phi = Math.max(scope.minPolarAngle, Math.min(scope.maxPolarAngle, spherical.phi));
        spherical.makeSafe();
        offset.setFromSpherical(spherical);
        scope.object.position.copy(scope.target).add(offset);
        scope.object.lookAt(scope.target);
    }
    function pan(dx, dy) {
        const distance = scope.object.position.distanceTo(scope.target);
        const fov = (scope.object.fov || 50) * Math.PI / 180;
        const h = scope.domElement.clientHeight || 1;
        const factor = 2 * Math.tan(fov / 2) * distance / h;

        const te = scope.object.matrix.elements;
        const xAxis = new THREE.Vector3(te[0], te[1], te[2]).multiplyScalar(-dx * factor * scope.panSpeed);
        const yAxis = new THREE.Vector3(te[4], te[5], te[6]).multiplyScalar(dy * factor * scope.panSpeed);
        scope.target.add(xAxis).add(yAxis);
        scope.object.position.add(xAxis).add(yAxis);
    }
    function zoom(scale) {
      offset.copy(scope.object.position).sub(scope.target);
      const distance = Math.max(scope.minDistance, Math.min(scope.maxDistance, offset.length() * scale));
      offset.setLength(distance);
      scope.object.position.copy(scope.target).add(offset);
    }

    function onPointerMove(event) {
      if (!isRotating && !isPanning) return;
      const dx = event.clientX - lastX;
      const dy = event.clientY - lastY;
      lastX = event.clientX;
      lastY = event.clientY;
      if (isRotating) rotate(dx, dy);
      else pan(dx, dy);
    }

    function onPointerUp() { isRotating = false; isPanning = false; }

    function onWheel(event) {
      if (!scope.enableZoom) return;
      event.preventDefault();
      zoom(event.deltaY > 0 ? 1 / getZoomScale() : getZoomScale());
    }

    // Touch: midden en afstand van de vingers; bij een wissel van het aantal vingers opnieuw beginnen.
    let touch = null;
    function touchState(list) {
      const a = list[0], b = list[1] || list[0];
      return { n: list.length, x: (a.clientX + b.clientX) / 2, y: (a.clientY + b.clientY) / 2, d: Math.hypot(a.clientX - b.clientX, a.clientY - b.clientY) };
    }
    function onTouchStart(event) {
      event.preventDefault();
      touch = touchState(event.touches);
    }
    function onTouchMove(event) {
      if (!touch) return;
      event.preventDefault();
      const t = touchState(event.touches);
      if (t.n !== touch.n) { touch = t; return; }
      if (t.n === 1) { if (scope.enableRotate) rotate(t.x - touch.x, t.y - touch.y); }
      else {
        if (scope.enablePan) pan(t.x - touch.x, t.y - touch.y);
        if (scope.enableZoom && t.d > 0 && touch.d > 0) zoom(touch.d / t.d);
      }
      touch = t;
    }
    function onTouchEnd(event) { touch = event.touches.length ? touchState(event.touches) : null; }

    function onContextMenu(event) { event.preventDefault(); }

    this.domElement.addEventListener('mousedown', onPointerDown);
    window.addEventListener('mousemove', onPointerMove);
    window.addEventListener('mouseup', onPointerUp);
    this.domElement.addEventListener('wheel', onWheel, { passive: false });
    this.domElement.addEventListener('contextmenu', onContextMenu);
    this.domElement.addEventListener('touchstart', onTouchStart, { passive: false });
    this.domElement.addEventListener('touchmove', onTouchMove, { passive: false });
    this.domElement.addEventListener('touchend', onTouchEnd);
    this.domElement.addEventListener('touchcancel', onTouchEnd);

    this.dispose = function () {
      scope.domElement.removeEventListener('mousedown', onPointerDown);
      window.removeEventListener('mousemove', onPointerMove);
      window.removeEventListener('mouseup', onPointerUp);
      scope.domElement.removeEventListener('wheel', onWheel);
      scope.domElement.removeEventListener('contextmenu', onContextMenu);
      scope.domElement.removeEventListener('touchstart', onTouchStart);
      scope.domElement.removeEventListener('touchmove', onTouchMove);
      scope.domElement.removeEventListener('touchend', onTouchEnd);
      scope.domElement.removeEventListener('touchcancel', onTouchEnd);
    };
  }

  THREE.OrbitControls = OrbitControls;
})();