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#include "gtest/gtest.h"
#include "singa/core/device.h"
#include "singa/proto/core.pb.h"

#ifdef USE_OPENCL

using singa::CppCPU;
using singa::OpenclDevice;
using singa::Block;

TEST(OpenclDevice, Constructor) {
  OpenclDevice dev;
  EXPECT_EQ(0, dev.id());
}


TEST(OpenclDevice, MemoryMallocFree) {
  OpenclDevice dev;
  Block* b = dev.NewBlock(4);
  EXPECT_NE(nullptr, b);
  EXPECT_EQ(4u, b->size());
  dev.FreeBlock(b);
}


TEST(OpenclDevice, Exec) {
  OpenclDevice dev;
  Block* b = dev.NewBlock(4);
  int x = 1, y =3, z = 0;
  dev.Exec([x, y, &z](singa::Context *ctx) {
      z = x + y;
      }, {b}, {b}, false);
  EXPECT_EQ(x + y, z);
  dev.FreeBlock(b);
}

// Tests for integrity of one round of data transfer to an OpenCL device and back.
TEST(OpenclDevice, CopyDataToFrom) {
  OpenclDevice dev;
  CppCPU host;

  Block* a = host.NewBlock(4);
  Block* b = dev.NewBlock(4);
  Block* c = host.NewBlock(4);

  // Allocate the Block object on the host.
  char s[] = {'a', 'b', 'c', 'x'};
  host.CopyDataFromHostPtr(a, s, 4);

  // Copy back and forth.
  dev.CopyDataToFrom(b, a, 4, singa::kHostToDevice);
  dev.CopyDataToFrom(c, b, 4, singa::kDeviceToHost);

  const char* astr = static_cast<const char*>(c->data());
  EXPECT_EQ('a', astr[0]);
  EXPECT_EQ('b', astr[1]);
  EXPECT_EQ('c', astr[2]);
  EXPECT_EQ('x', astr[3]);
}


TEST(OpenclDevice, DuplicateDataOnDevice) {
  OpenclDevice dev;
  CppCPU host;

  Block* a = host.NewBlock(4);
  Block* b = dev.NewBlock(4);
  Block* c = dev.NewBlock(4);
  Block* d = host.NewBlock(4);

  // Allocate the Block object on the host.
  char s[] = {'a', 'b', 'c', 'x'};
  host.CopyDataFromHostPtr(a, s, 4);

  // Copy to device and duplicate.
  dev.CopyDataToFrom(b, a, 4, singa::kHostToDevice);
  dev.CopyDataToFrom(c, b, 4, singa::kDeviceToDevice);
  dev.CopyDataToFrom(d, c, 4, singa::kDeviceToHost);

  const char* astr = static_cast<const char*>(d->data());
  EXPECT_EQ('a', astr[0]);
  EXPECT_EQ('b', astr[1]);
  EXPECT_EQ('c', astr[2]);
  EXPECT_EQ('x', astr[3]);
}

#endif // USE_OPENCL