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#include "../src/model/layer/concat.h"
#include "gtest/gtest.h"

using singa::Shape;

TEST(Concat, Setup) {
  Shape s1 {2u, 3u};
  Shape s2 {1u, 3u};
  singa::LayerConf conf;
  conf.set_type("singa_concat");
  conf.mutable_concat_conf()->set_axis(0);
  singa::Concat layer;
  layer.Setup({{3u}, {3u}}, conf);
  auto s = layer.GetOutputSampleShape();
  EXPECT_EQ(s[0], 3u);
}

void ForwardConcatRowTest(std::shared_ptr<singa::Device> dev) {
  size_t a = 2u, b = 1u, c = 3u;
  singa::Tensor t1({a, c}, dev);
  singa::Tensor t2({b, c}, dev);
  singa::LayerConf conf;
  conf.set_type("singa_concat");
  conf.mutable_concat_conf()->set_axis(0);
  singa::Concat layer;
  layer.Setup({{c}, {c}}, conf);
  layer.ToDevice(dev);

  t1.SetValue(1.0f);
  t2.SetValue(2.0f);
  auto out = layer.Forward(singa::kTrain, {t1, t2});
  EXPECT_EQ(out.size(), 1u);

  out[0].ToHost();
  const float * outptr = out[0].data<float>();
  for (size_t i = 0; i < a; i++) {
    for (size_t j = 0; j < c; j++)
      EXPECT_FLOAT_EQ(outptr[i * c + j], 1.0f);
  }
  for (size_t i = a; i < a + b; i++) {
    for (size_t j = 0; j < c; j++)
      EXPECT_FLOAT_EQ(outptr[i  * c + j], 2.0f);
  }

}

void ForwardConcatColumnTest(std::shared_ptr<singa::Device> dev) {
  size_t a = 2u, b = 1u, c = 3u;
  singa::Tensor t1({c, a}, dev);
  singa::Tensor t2({c, b}, dev);
  singa::LayerConf conf;
  conf.set_type("singa_concat");
  conf.mutable_concat_conf()->set_axis(1);
  singa::Concat layer;
  layer.Setup({{a}, {b}}, conf);
  layer.ToDevice(dev);

  t1.SetValue(1.0f);
  t2.SetValue(2.0f);
  auto out = layer.Forward(singa::kTrain, {t1, t2});
  EXPECT_EQ(out.size(), 1u);
  out[0].ToHost();
  const float * outptr = out[0].data<float>();
  for (size_t i = 0; i < c; i++) {
    for (size_t j = 0; j < a; j++)
      EXPECT_FLOAT_EQ(outptr[i * (a + b) + j], 1.0f);
  }
  for (size_t i = 0; i < c; i++) {
    for (size_t j = a; j < a + b; j++)
      EXPECT_FLOAT_EQ(outptr[i  * (a + b) + j], 2.0f);
  }

}
TEST(Concat, ForwardConcatRowCpp) {
  ForwardConcatRowTest(singa::defaultDevice);
}

TEST(Concat, ForwardConcatColumnCpp) {
  ForwardConcatColumnTest(singa::defaultDevice);
}


#ifdef USE_CUDA
TEST(Concat, ForwardConcatRowCuda) {
  ForwardConcatRowTest(std::make_shared<singa::CudaGPU>());
}

TEST(Concat, ForwardConcatColumnCuda) {
  ForwardConcatColumnTest(std::make_shared<singa::CudaGPU>());
}
#endif  // USE_CUDA


void BackwardConcatRowTest(std::shared_ptr<singa::Device> dev) {
  size_t a = 2u, b = 1u, c = 3u;
  singa::LayerConf conf;
  conf.set_type("singa_concat");
  conf.mutable_concat_conf()->set_axis(0);
  singa::Concat layer;
  layer.Setup({{c}, {c}}, conf);
  layer.ToDevice(dev);

  singa::Tensor t1({a, c}, dev);
  singa::Tensor t2({b, c}, dev);
  t1.SetValue(1.0f);
  t2.SetValue(2.0f);
  layer.Forward(singa::kTrain, {t1, t2});

  singa::Tensor t({a + b, c}, dev);
  singa::Uniform(-1.f, 1.f, &t);
  auto out = layer.Backward(singa::kTrain, {t});
  auto grads = out.first;
  EXPECT_EQ(grads.size(), 2u);

  t.ToHost();
  const float* tptr = t.data<float>();

  grads[0].ToHost();
  const float * outa = grads[0].data<float>();
  for (size_t i = 0; i < a; i++)
    for (size_t j = 0; j < c; j++)
      EXPECT_FLOAT_EQ(outa[i * c + j], tptr[i * c + j]);
  grads[1].ToHost();
  const float * outb = grads[1].data<float>();
  for (size_t i = 0; i < b; i++)
    for (size_t j = 0; j < c; j++)
      EXPECT_FLOAT_EQ(outb[i  * c + j], tptr[(i + a) * c + j]);
}

void BackwardConcatColumnTest(std::shared_ptr<singa::Device> dev) {
  size_t a = 2u, b = 1u, c = 3u;
  singa::LayerConf conf;
  conf.set_type("singa_concat");
  conf.mutable_concat_conf()->set_axis(1);
  singa::Concat layer;
  layer.Setup({{a}, {b}}, conf);
  layer.ToDevice(dev);

  singa::Tensor t1({c, a}, dev);
  singa::Tensor t2({c, b}, dev);
  t1.SetValue(1.0f);
  t2.SetValue(2.0f);
  layer.Forward(singa::kTrain, {t1, t2});

  singa::Tensor t({c, a + b}, dev);
  singa::Uniform(-1.f, 1.f, &t);
  auto out = layer.Backward(singa::kTrain, {t});
  auto grads = out.first;
  EXPECT_EQ(grads.size(), 2u);

  t.ToHost();
  const float* tptr = t.data<float>();

  grads[0].ToHost();
  const float * outa = grads[0].data<float>();
  for (size_t i = 0; i < c; i++)
    for (size_t j = 0; j < a; j++)
      EXPECT_FLOAT_EQ(outa[i * a + j], tptr[i * (a + b) + j]);
  grads[1].ToHost();
  const float * outb = grads[1].data<float>();
  for (size_t i = 0; i < c; i++)
    for (size_t j = 0; j < b; j++)
      EXPECT_FLOAT_EQ(outb[i  * b + j], tptr[i * (a + b) + a + j]);
}

TEST(Concat, BackwardConcatRowCpp) {
  BackwardConcatRowTest(singa::defaultDevice);
}

TEST(Concat, BackwardConcatColumn) {
  BackwardConcatColumnTest(singa::defaultDevice);
}


#ifdef USE_CUDA
TEST(Concat, BackwardConcatRowCuda) {
  BackwardConcatRowTest(std::make_shared<singa::CudaGPU>());
}

TEST(Concat, BackwardConcatColumnCuda) {
  BackwardConcatColumnTest(std::make_shared<singa::CudaGPU>());
}
#endif  // USE_CUDA