/**
 * This is an overloaded member function, provided for convenience. It differs from the above function
 * only in what argument(s) it accepts.
 *
 * @param image the 8-bit single-channel image to be labeled
 *
 * @param labels destination labeled image
 *
 * @param stats statistics output for each label, including the background label, see below for
 * available statistics. Statistics are accessed via stats(label, COLUMN) where COLUMN is one of
 * ConnectedComponentsTypes. The data type is CV_32S.
 *
 * @param centroids centroid output for each label, including the background label. Centroids are
 * accessed via centroids(label, 0) for x and centroids(label, 1) for y. The data type CV_64F.
 *
 * @param connectivity 8 or 4 for 8-way or 4-way connectivity respectively
 *
 * @param ltype output image label type. Currently CV_32S and CV_16U are supported.
 */
export declare function connectedComponentsWithStats(image: InputArray, labels: OutputArray, stats: OutputArray, centroids: OutputArray, connectivity?: int, ltype?: int): int;

// 1. 将原始蒙版转化为灰度图像
const grayIm = new cv.Mat();
cv.cvtColor(im, grayIm, cv.COLOR_BGR2GRAY);
// 2. 得到连通域
const labels = new cv.Mat();
const stats = new cv.Mat();
const centroids = new cv.Mat();
const cnt = cv.connectedComponentsWithStats(grayIm, labels, stats, centroids, 8);
const miniAreaIndexes = [];
// 3. 计算总面积
let totalArea = 0;
for (let i = 0; i < cnt; i++) {
  const area = stats.row(i).data32S[4];
  if (i !== 0) totalArea += area;
}
// 4. 记录需要过滤的连通域index
for (let i = 1; i < cnt; i++) {
  const area = stats.row(i).data32S[4];
  // stats.row(0)表示的是整个原始蒙版背景
  // 这里判断需要过滤的连通域标准是：面积小于原始蒙版面积的1%且小于所有连通域平均面积的10%
  if (area < stats.row(0).data32S[4] * 0.01 && area < (totalArea / cnt) * 0.1) {
    miniAreaIndexes.push(i);
  }
}
//5.将原始蒙版中不符合要求的部分剔除
for (let i = 0; i < labels.data32S.length; i++) {
  const label = labels.data32S.at(i);
  if (miniAreaIndexes.includes(label) && label !== 0) {
    im.data.set([0, 0, 0, 0], i * 4);
  }
}

// oc 是已经加载的 OpenCascadeInstance 实例
// face 是 TopoDS_Face 类

// explorer 是一个迭代器
const explorer = new oc.TopExp_Explorer_2(face, oc.TopAbs_ShapeEnum.TopAbs_EDGE, oc.TopAbs_ShapeEnum.TopAbs_SHAPE)
while (explorer.More()) {
  // 通过explorer.Current() 拿到当前只向的TopoDS_Shape
  // 由于OCCT基于C++编写，是强类型的，所以需要通过下面的方法声明为TopoDS_Edge类型
  const edge = oc.TopoDS.Edge_1(explorer.Current())
  // 后续操作
  // ...
  // 后续操作
}

// oc 是已经加载的 OpenCascadeInstance 实例
// face 是 TopoDS_Face 类

// explorer 是一个迭代器
// 使用 BRepTools_WireExplorer 替代 TopExp_Explorer 遍历Face/Wire的Edge可以保证顺序
const explorer = new OcctInstance.oc.BRepTools_WireExplorer_3(outerWire, face)
while (explorer.More()) {
  // 通过explorer.Current() 拿到当前只向的TopoDS_Shape
  // 由于OCCT基于C++编写，是强类型的，所以需要通过下面的方法声明为TopoDS_Edge类型
  const edge = oc.TopoDS.Edge_1(explorer.Current())
  // 后续操作
  // ...
  // 后续操作
}

// 在某处创建迭代器
const explorer = new oc.TopExp_Explorer_1()
for (explorer.Init(face1, oc.TopAbs_ShapeEnum.TopAbs_EDGE, oc.TopAbs_ShapeEnum.TopAbs_SHAPE); explorer.More(); explorer.Next()) {
  // ...
}

for (explorer.Init(face2, oc.TopAbs_ShapeEnum.TopAbs_EDGE, oc.TopAbs_ShapeEnum.TopAbs_SHAPE); explorer.More(); explorer.Next()) {
  // ...
}

// 销毁迭代器
explorer.delete()

extrudeMeshMat.onBeforeCompile = function(shader) {
  shader.fragmentShader = shader.fragmentShader.replace(
    '#include <dithering_fragment>',
    `
      #ifdef OPAQUE
      diffuseColor.a = 1.0;
      #endif
      
      #ifdef USE_TRANSMISSION
      diffuseColor.a *= material.transmissionAlpha + 0.1;
      #endif
      
      if ( gl_FrontFacing ) { \
        gl_FragColor = vec4( 1.0, 0.0, 0.0, diffuseColor.a ); \
      } else { \
        gl_FragColor = vec4( 0.0, 1.0, 0.0, diffuseColor.a ); \
      }
    `
  )
};

const material1 = new THREE.MeshBasicMaterial({color: 0xff0000});
const material2 = new THREE.MeshBasicMaterial({color: 0x00ff00});
const materials = [material1, material2]

const finalVertices = <THREE.Vector3[]>[...] // 几何体的顶点
const geo = new THREE.BufferGeometry()
geo.setFromPoints(finalVertices)
// ! 计算法向量要在只有一个面的时候计算
geo.computeVertexNormals() 
const newIndexes = <number[]>[]
const count = finalVertices.length
for(let i = 0; i < count; i += 3) {
    newIndexes.push(i, i + 1, i + 2)
}
for(let i = 0; i < count; i += 3) {
    newIndexes.push(i, i + 2, i + 1)
}
geo.setIndex(newIndexes)

geo.addGroup(0, count, 0)
geo.addGroup(count, count, 1)