//
/**
 * Copyright (c) 2019 Razeware LLC
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
 * distribute, sublicense, create a derivative work, and/or sell copies of the
 * Software in any work that is designed, intended, or marketed for pedagogical or
 * instructional purposes related to programming, coding, application development,
 * or information technology.  Permission for such use, copying, modification,
 * merger, publication, distribution, sublicensing, creation of derivative works,
 * or sale is expressly withheld.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import MetalKit

struct Mesh {
  let mtkMesh: MTKMesh
  let submeshes: [Submesh]
  let transform: TransformComponent?
  let skeleton: Skeleton?

  init(mdlMesh: MDLMesh, mtkMesh: MTKMesh,
       startTime: TimeInterval,
       endTime: TimeInterval,
       vertexFunctionName: String,
       fragmentFunctionName: String) {
    // load skeleton
    let skeleton =
      Skeleton(animationBindComponent:
        (mdlMesh.componentConforming(to: MDLComponent.self)
          as? MDLAnimationBindComponent))
    self.skeleton = skeleton

    // load submeshes
    self.mtkMesh = mtkMesh
    submeshes = zip(mdlMesh.submeshes!, mtkMesh.submeshes).map { mesh in
      Submesh(mdlSubmesh: mesh.0 as! MDLSubmesh,
              mtkSubmesh: mesh.1,
              hasSkeleton: skeleton != nil,
              vertexFunctionName: vertexFunctionName,
              fragmentFunctionName: fragmentFunctionName)
      
    }
    
    if let mdlMeshTransform = mdlMesh.transform {
      transform = TransformComponent(transform: mdlMeshTransform,
                                     object: mdlMesh,
                                     startTime: startTime,
                                     endTime: endTime)
    } else {
      transform = nil
    }
  }
}