/* Copyright 2015 Google Inc. 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.
==============================================================================*/

#include "tensorflow/core/public/tensor_c_api.h"

#include <vector>
#include "tensorflow/core/framework/tensor.h"
#include "tensorflow/core/platform/test.h"

using tensorflow::Tensor;
using tensorflow::TensorShape;

namespace tensorflow {
bool TF_Tensor_DecodeStrings(TF_Tensor* src, Tensor* dst, TF_Status* status);
TF_Tensor* TF_Tensor_EncodeStrings(const Tensor& src);
}  // namespace tensorflow

TEST(CApi, Status) {
  TF_Status* s = TF_NewStatus();
  EXPECT_EQ(TF_OK, TF_GetCode(s));
  EXPECT_EQ(tensorflow::string(), TF_Message(s));
  TF_SetStatus(s, TF_CANCELLED, "cancel");
  EXPECT_EQ(TF_CANCELLED, TF_GetCode(s));
  EXPECT_EQ(tensorflow::string("cancel"), TF_Message(s));
  TF_DeleteStatus(s);
}

static void Deallocator(void* data, size_t, void* arg) {
  tensorflow::cpu_allocator()->DeallocateRaw(data);
  *reinterpret_cast<bool*>(arg) = true;
}

TEST(CApi, Tensor) {
  float* values =
      reinterpret_cast<float*>(tensorflow::cpu_allocator()->AllocateRaw(
          EIGEN_MAX_ALIGN_BYTES, 6 * sizeof(float)));
  tensorflow::int64 dims[] = {2, 3};
  bool deallocator_called = false;
  TF_Tensor* t = TF_NewTensor(TF_FLOAT, dims, 2, values, sizeof(values),
                              &Deallocator, &deallocator_called);
  EXPECT_FALSE(deallocator_called);
  EXPECT_EQ(TF_FLOAT, TF_TensorType(t));
  EXPECT_EQ(2, TF_NumDims(t));
  EXPECT_EQ(dims[0], TF_Dim(t, 0));
  EXPECT_EQ(dims[1], TF_Dim(t, 1));
  EXPECT_EQ(sizeof(values), TF_TensorByteSize(t));
  EXPECT_EQ(static_cast<void*>(values), TF_TensorData(t));
  TF_DeleteTensor(t);
  EXPECT_TRUE(deallocator_called);
}

static void TestEncodeDecode(int line,
                             const std::vector<tensorflow::string>& data) {
  const tensorflow::int64 n = data.size();
  for (std::vector<tensorflow::int64> dims :
       std::vector<std::vector<tensorflow::int64>>{
           {n}, {1, n}, {n, 1}, {n / 2, 2}}) {
    // Create C++ Tensor
    Tensor src(tensorflow::DT_STRING, TensorShape(dims));
    for (tensorflow::int64 i = 0; i < src.NumElements(); i++) {
      src.flat<tensorflow::string>()(i) = data[i];
    }
    TF_Tensor* dst = TF_Tensor_EncodeStrings(src);

    // Convert back to a C++ Tensor and ensure we get expected output.
    TF_Status* status = TF_NewStatus();
    Tensor output;
    ASSERT_TRUE(TF_Tensor_DecodeStrings(dst, &output, status)) << line;
    ASSERT_EQ(TF_OK, TF_GetCode(status)) << line;
    ASSERT_EQ(src.NumElements(), output.NumElements()) << line;
    for (tensorflow::int64 i = 0; i < src.NumElements(); i++) {
      ASSERT_EQ(data[i], output.flat<tensorflow::string>()(i)) << line;
    }

    TF_DeleteStatus(status);
    TF_DeleteTensor(dst);
  }
}

TEST(CApi, TensorEncodeDecodeStrings) {
  TestEncodeDecode(__LINE__, {});
  TestEncodeDecode(__LINE__, {"hello"});
  TestEncodeDecode(__LINE__,
                   {"the", "quick", "brown", "fox", "jumped", "over"});

  tensorflow::string big(1000, 'a');
  TestEncodeDecode(__LINE__, {"small", big, "small2"});
}

TEST(CApi, SessionOptions) {
  TF_SessionOptions* opt = TF_NewSessionOptions();
  TF_DeleteSessionOptions(opt);
}

// TODO(jeff,sanjay): Session tests
// . Create and delete
// . Extend graph
// . Run
