//
// Copyright © 2020, 2023 Arm Ltd and Contributors. All rights reserved.
// SPDX-License-Identifier: MIT
//

#pragma once

#include "TestUtils.hpp"

#include <armnn_delegate.hpp>
#include <DelegateTestInterpreter.hpp>

#include <flatbuffers/flatbuffers.h>
#include <tensorflow/lite/kernels/register.h>
#include <tensorflow/lite/version.h>

#include <doctest/doctest.h>

namespace
{

std::vector<char> CreatePooling2dTfLiteModel(
    tflite::BuiltinOperator poolingOperatorCode,
    tflite::TensorType tensorType,
    const std::vector <int32_t>& inputTensorShape,
    const std::vector <int32_t>& outputTensorShape,
    tflite::Padding padding = tflite::Padding_SAME,
    int32_t strideWidth = 0,
    int32_t strideHeight = 0,
    int32_t filterWidth = 0,
    int32_t filterHeight = 0,
    tflite::ActivationFunctionType fusedActivation = tflite::ActivationFunctionType_NONE,
    float quantScale = 1.0f,
    int quantOffset  = 0)
{
    using namespace tflite;
    flatbuffers::FlatBufferBuilder flatBufferBuilder;

    flatbuffers::Offset<tflite::Buffer> buffers[3] = {CreateBuffer(flatBufferBuilder),
                                                                        CreateBuffer(flatBufferBuilder),
                                                                        CreateBuffer(flatBufferBuilder)};

    auto quantizationParameters =
        CreateQuantizationParameters(flatBufferBuilder,
                                     0,
                                     0,
                                     flatBufferBuilder.CreateVector<float>({ quantScale }),
                                     flatBufferBuilder.CreateVector<int64_t>({ quantOffset }));

    flatbuffers::Offset<Tensor> tensors[2] {
         CreateTensor(flatBufferBuilder,
                              flatBufferBuilder.CreateVector<int32_t>(inputTensorShape),
                              tensorType,
                              1,
                              flatBufferBuilder.CreateString("input"),
                              quantizationParameters),

         CreateTensor(flatBufferBuilder,
                              flatBufferBuilder.CreateVector<int32_t>(outputTensorShape),
                              tensorType,
                              2,
                              flatBufferBuilder.CreateString("output"),
                              quantizationParameters)
    };

    // create operator
    tflite::BuiltinOptions operatorBuiltinOptionsType = BuiltinOptions_Pool2DOptions;
    flatbuffers::Offset<void> operatorBuiltinOptions = CreatePool2DOptions(flatBufferBuilder,
                                                                           padding,
                                                                           strideWidth,
                                                                           strideHeight,
                                                                           filterWidth,
                                                                           filterHeight,
                                                                           fusedActivation).Union();

    const std::vector<int32_t> operatorInputs{0};
    const std::vector<int32_t> operatorOutputs{1};
    flatbuffers::Offset <Operator> poolingOperator =
        CreateOperator(flatBufferBuilder,
                       0,
                       flatBufferBuilder.CreateVector<int32_t>(operatorInputs),
                       flatBufferBuilder.CreateVector<int32_t>(operatorOutputs),
                       operatorBuiltinOptionsType,
                       operatorBuiltinOptions);

    const int subgraphInputs[1] = {0};
    const int subgraphOutputs[1] = {1};
    flatbuffers::Offset <SubGraph> subgraph =
        CreateSubGraph(flatBufferBuilder,
                       flatBufferBuilder.CreateVector(tensors, 2),
                       flatBufferBuilder.CreateVector<int32_t>(subgraphInputs, 1),
                       flatBufferBuilder.CreateVector<int32_t>(subgraphOutputs, 1),
                       flatBufferBuilder.CreateVector(&poolingOperator, 1));

    flatbuffers::Offset <flatbuffers::String> modelDescription =
        flatBufferBuilder.CreateString("ArmnnDelegate: Pooling2d Operator Model");
    flatbuffers::Offset <OperatorCode> operatorCode = CreateOperatorCode(flatBufferBuilder, poolingOperatorCode);

    flatbuffers::Offset <Model> flatbufferModel =
        CreateModel(flatBufferBuilder,
                    TFLITE_SCHEMA_VERSION,
                    flatBufferBuilder.CreateVector(&operatorCode, 1),
                    flatBufferBuilder.CreateVector(&subgraph, 1),
                    modelDescription,
                    flatBufferBuilder.CreateVector(buffers, 3));

    flatBufferBuilder.Finish(flatbufferModel, armnnDelegate::FILE_IDENTIFIER);

    return std::vector<char>(flatBufferBuilder.GetBufferPointer(),
                             flatBufferBuilder.GetBufferPointer() + flatBufferBuilder.GetSize());
}

template <typename T>
void Pooling2dTest(tflite::BuiltinOperator poolingOperatorCode,
                   tflite::TensorType tensorType,
                   std::vector<armnn::BackendId>& backends,
                   std::vector<int32_t>& inputShape,
                   std::vector<int32_t>& outputShape,
                   std::vector<T>& inputValues,
                   std::vector<T>& expectedOutputValues,
                   tflite::Padding padding = tflite::Padding_SAME,
                   int32_t strideWidth = 0,
                   int32_t strideHeight = 0,
                   int32_t filterWidth = 0,
                   int32_t filterHeight = 0,
                   tflite::ActivationFunctionType fusedActivation = tflite::ActivationFunctionType_NONE,
                   float quantScale = 1.0f,
                   int quantOffset  = 0)
{
    using namespace delegateTestInterpreter;
    std::vector<char> modelBuffer = CreatePooling2dTfLiteModel(poolingOperatorCode,
                                                               tensorType,
                                                               inputShape,
                                                               outputShape,
                                                               padding,
                                                               strideWidth,
                                                               strideHeight,
                                                               filterWidth,
                                                               filterHeight,
                                                               fusedActivation,
                                                               quantScale,
                                                               quantOffset);

    // Setup interpreter with just TFLite Runtime.
    auto tfLiteInterpreter = DelegateTestInterpreter(modelBuffer);
    CHECK(tfLiteInterpreter.AllocateTensors() == kTfLiteOk);
    CHECK(tfLiteInterpreter.FillInputTensor<T>(inputValues, 0) == kTfLiteOk);
    CHECK(tfLiteInterpreter.Invoke() == kTfLiteOk);
    std::vector<T>       tfLiteOutputValues = tfLiteInterpreter.GetOutputResult<T>(0);
    std::vector<int32_t> tfLiteOutputShape  = tfLiteInterpreter.GetOutputShape(0);

    // Setup interpreter with Arm NN Delegate applied.
    auto armnnInterpreter = DelegateTestInterpreter(modelBuffer, backends);
    CHECK(armnnInterpreter.AllocateTensors() == kTfLiteOk);
    CHECK(armnnInterpreter.FillInputTensor<T>(inputValues, 0) == kTfLiteOk);
    CHECK(armnnInterpreter.Invoke() == kTfLiteOk);
    std::vector<T>       armnnOutputValues = armnnInterpreter.GetOutputResult<T>(0);
    std::vector<int32_t> armnnOutputShape  = armnnInterpreter.GetOutputShape(0);

    armnnDelegate::CompareOutputData<T>(tfLiteOutputValues, armnnOutputValues, expectedOutputValues);
    armnnDelegate::CompareOutputShape(tfLiteOutputShape, armnnOutputShape, outputShape);

    tfLiteInterpreter.Cleanup();
    armnnInterpreter.Cleanup();
}

} // anonymous namespace