import { BufferGeometry, InstancedMesh, LineSegments, Matrix4, Mesh } from 'three';
import { InstancedLods } from '../render/lods/InstancedLods';
/**
 * Callback function for models load progress event.
 * @param progress - progress of loaded models in percent.
 */
export type ProgressCallbackFunction = (progress: number) => void;
/**
 * Callback function for load model event.
 * @param modelId - GUID for loaded model.
 */
export type LoadedCallbackFunction = (modelId: string, isLastModel: boolean) => void;
/**
 * Callback function for notFound model event.
 * @param modelId - GUID for loaded model.
 */
export type NotFoundCallbackFunction = (modelId: string) => void;
/**
 * Callback function for error model event.
 * @param modelId - GUID for loaded model.
 * @param error - error message.
 */
export type ErrorCallbackFunction = (modelId: string, error: string) => void;
/**
 * Callback function called for each buffer vertex with custom value.
 * @param geometry - Current BufferGeometry instance.
 * @param elNum - Current element number.
 * @param idx - Current buffer index in BufferGeometry instance.
 * @param val - Current custom value.
 */
export type TraverseMeshValCallbackFunction = (geometry: BufferGeometry, elNum: number, idx: number, val: any) => void;
/**
 * Callback function called for each buffer vertex.
 * @param geometry - Current BufferGeometry instance.
 * @param elNum - Current element number.
 * @param idx - Current buffer index in BufferGeometry instance.
 */
export type TraverseMeshCallbackFunction = (geometry: BufferGeometry, elNum: number, idx: number, val?: any) => void;
/**
 * Callback function called at the end of each buffer traversing.
 * @param geometry - Current BufferGeometry instance.
 * @param isMesh - Is buffer mesh or line.
 */
export type EndTraverseMeshCallbackFunction = (geometry: BufferGeometry, isMesh: boolean, object: Mesh | LineSegments) => void;
/**
 * Callback function called at the start of each buffer before traversing.
 * @param geometry - Current BufferGeometry instance.
 * @param objIdx - Current mesh index.
 * @param isMesh - Is buffer mesh or line.
 */
export type StartTraverseMeshCallbackFunction = (geometry: BufferGeometry, objIdx: number, isMesh: boolean, object: Mesh | LineSegments) => void;
/**
 * Callback function called for each mesh instance item.
 * @param child - Current BufferGeometry instance.
 * @param objIdx - Current mesh index.
 * @param elNum - Current element number.
 * @param matrix - Transformation matrix for current item.
 * @param idx - Instance item number.
 * @param val - Current custom value.
 */
export type TraverseInstanceMeshValCallbackFunction = (child: InstancedMesh, objIdx: number, elNum: number, matrix: Matrix4, idx: number, val: any) => void;
/**
 * Callback function called for each instanced mesh item.
 * @param child - Current BufferGeometry instance.
 * @param objIdx - Current mesh index.
 * @param elNum - Current element number.
 * @param matrix - Transformation matrix for current item.
 * @param idx - Instance item number.
 */
export type TraverseInstancedMeshCallbackFunction = (child: InstancedMesh, objIdx: number, elNum: number, matrix: Matrix4, idx: number, val?: any) => void;
/**
 * Callback function called at the end of instanced mesh traversing.
 * @param child - Current BufferGeometry instance.
 * @param objIdx - Current mesh index.
 */
export type EndTraverseInstancedMeshCallbackFunction = (child: InstancedMesh, objIdx: number) => void;
/**
 * Callback function called at the start of instanced mesh traversing.
 * @param child - Current BufferGeometry instance.
 * @param objIdx - Current mesh index.
 */
export type StartTraverseInstancedMeshCallbackFunction = (child: InstancedMesh, objIdx: number) => void;
/**
 * Callback function called for each LOD instance item.
 * @param child - Current BufferGeometry instance.
 * @param objIdx - Current mesh index.
 * @param elNum - Current element number.
 * @param matrix - Transformation matrix for current item.
 * @param idx - Instance item number.
 */
export type TraverseInstancedLodsCallbackFunction = (child: InstancedLods, objIdx: number, elNum: number, matrix: Matrix4, idx: number) => void;
/**
 * Callback function called at the end of LOD traversing.
 * @param child - Current BufferGeometry instance.
 * @param objIdx - Current mesh index.
 */
export type EndTraverseInstancedLodsCallbackFunction = (child: InstancedLods, objIdx: number) => void;
/**
 * Callback function called at the start of LOD traversing.
 * @param child - Current BufferGeometry instance.
 * @param objIdx - Current mesh index.
 */
export type StartTraverseInstancedLodsCallbackFunction = (child: InstancedLods, objIdx: number) => void;
/**
 * Options with callbacks used in traverse functions of {@link SceneManager}.
 * Used for changing buffers data for particular elements in traversing loop.
 * @param meshCallback - See {@link TraverseMeshCallbackFunction}
 * @param endMeshCallback - See {@link EndTraverseMeshCallbackFunction}
 * @param startMeshCallback - See {@link StartTraverseMeshCallbackFunction}
 * @param instanceMeshCallback - See {@link TraverseInstancedMeshCallbackFunction}
 * @param startInstanceMeshCallback - See {@link StartTraverseInstancedMeshCallbackFunction}
 * @param endInstanceMeshCallback - See {@link EndTraverseInstancedMeshCallbackFunction}
 * @param instancedLodsCallback - See {@link TraverseInstancedLodsCallbackFunction}
 * @param startInstancedLodsCallback - See {@link StartTraverseInstancedLodsCallbackFunction}
 * @param endInstancedLodsCallback - See {@link EndTraverseInstancedLodsCallbackFunction}
 */
export interface TraverseCallbackOptions {
    meshCallback?: TraverseMeshCallbackFunction;
    endMeshCallback?: EndTraverseMeshCallbackFunction;
    startMeshCallback?: StartTraverseMeshCallbackFunction;
    instancedMeshCallback?: TraverseInstancedMeshCallbackFunction;
    startInstancedMeshCallback?: StartTraverseInstancedMeshCallbackFunction;
    endInstancedMeshCallback?: EndTraverseInstancedMeshCallbackFunction;
    instancedLodsCallback?: TraverseInstancedLodsCallbackFunction;
    /** When set, called once per InstancedLods instead of per-instance {@link instancedLodsCallback}. */
    instancedLodsSpatialTraverseCallback?: (child: InstancedLods, objIdx: number) => void;
    startInstancedLodsCallback?: StartTraverseInstancedLodsCallbackFunction;
    endInstancedLodsCallback?: EndTraverseInstancedLodsCallbackFunction;
}