/* Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 
 http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License. */

import Foundation

class MulticlassNMSParam<P: PrecisionType>: OpParam {
  //typealias ParamPrecisionType = P
  required init(opDesc: PMOpDesc, inScope: Scope) throws {
    do {
      scores = try MulticlassNMSParam.getFirstTensor(key: "Scores", map: opDesc.inputs, from: inScope)
      bboxes = try MulticlassNMSParam.getFirstTensor(key: "BBoxes", map: opDesc.inputs, from: inScope)
      output = try MulticlassNMSParam.outputOut(outputs: opDesc.outputs, from: inScope)
      
      middleOutput = FetchHolder.init(inPaddedCapacity: scores.tensorDim.numel(), inDim: scores.tensorDim)
      
      bboxOutput = FetchHolder.init(inPaddedCapacity: bboxes.tensorDim.numel(), inDim: bboxes.tensorDim)
    } catch let error {
      throw error
    }
  }
  var bboxOutput: FetchHolder
  var middleOutput: FetchHolder
  let scores: Texture
  let bboxes: Texture
  var output: Texture
}

class MulticlassNMSOp<P: PrecisionType>: Operator<MulticlassNMSKernel<P>, MulticlassNMSParam<P>>, Runable, Creator, InferShaperable{

  func inputVariant() -> [String : [MTLBuffer]] {
    guard let scoreBuffer = para.middleOutput.resultBuffer, let bboxBuffer = para.middleOutput.resultBuffer else {
      fatalError()
    }
    return ["Scores" : [scoreBuffer], "BBoxes" : [bboxBuffer]]
  }
  
  func computeMiddleResult(device: MTLDevice, buffer: MTLCommandBuffer) {
    do {
      try kernel.compute(commandBuffer: buffer, param: para)
    } catch let _ {
      fatalError()
    }
  }
  
  func inferShape() {
    // para.output.dim = para.input.dim
  }
  
  typealias OpType =  MulticlassNMSOp<P>
  func runImpl(device: MTLDevice, buffer: MTLCommandBuffer) throws {

  }
  
  func delogOutput() {
    print(" nms - output: ")
    print(para.bboxes.metalTexture.float32Array().strideArray())
  }
}



