/**
 * Copyright 2020 Huawei Technologies Co., Ltd
 *
 * 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 <iostream>
#include <memory>
#include <vector>

#include "minddata/dataset/core/client.h"
#include "common/common.h"
#include "utils/ms_utils.h"
#include "gtest/gtest.h"
#include "utils/log_adapter.h"
#include "minddata/dataset/engine/data_schema.h"
#include "minddata/dataset/engine/datasetops/source/text_file_op.h"
#include "minddata/dataset/util/status.h"

namespace common = mindspore::common;

using namespace mindspore::dataset;
using mindspore::LogStream;
using mindspore::ExceptionType::NoExceptionType;
using mindspore::MsLogLevel::INFO;

class MindDataTestTextFileOp : public UT::DatasetOpTesting {};

TEST_F(MindDataTestTextFileOp, TestTextFileBasic) {
  // Start with an empty execution tree
  auto tree = std::make_shared<ExecutionTree>();
  Status rc;
  std::string dataset_path;
  dataset_path = datasets_root_path_ + "/testTextFileDataset/1.txt";
  std::shared_ptr<ConfigManager> config_manager = GlobalContext::config_manager();
  int32_t num_workers = 1;  // Only one file
  int32_t op_connector_size = 2;
  int32_t worker_connector_size = config_manager->worker_connector_size();
  int64_t total_rows = 0;  // read all rows
  std::unique_ptr<DataSchema> schema = std::make_unique<DataSchema>();
  rc = schema->AddColumn(ColDescriptor("text", DataType(DataType::DE_UINT8), TensorImpl::kFlexible, 1));
  ASSERT_OK(rc);
  std::vector<std::string> files = {dataset_path};
  bool shuffle_files = false;
  int32_t num_devices = 1;
  int32_t device_id = 0;

  std::shared_ptr<TextFileOp> op =
    std::make_shared<TextFileOp>(num_workers, total_rows, worker_connector_size, std::move(schema), files,
                                 op_connector_size, shuffle_files, num_devices, device_id);
  rc = op->Init();
  ASSERT_OK(rc);

  rc = tree->AssociateNode(op);
  ASSERT_OK(rc);

  rc = tree->AssignRoot(op);
  ASSERT_OK(rc);

  MS_LOG(INFO) << "Launching tree and begin iteration.";
  rc = tree->Prepare();
  ASSERT_OK(rc);

  rc = tree->Launch();
  ASSERT_OK(rc);

  // Start the loop of reading tensors from our pipeline
  DatasetIterator di(tree);
  TensorRow tensor_list;
  rc = di.FetchNextTensorRow(&tensor_list);
  ASSERT_OK(rc);

  int row_count = 0;
  while (!tensor_list.empty()) {
    // Display the tensor by calling the printer on it
    for (int i = 0; i < tensor_list.size(); i++) {
      std::ostringstream ss;
      ss << "(" << tensor_list[i] << "): " << *tensor_list[i] << std::endl;
      MS_LOG(INFO) << "Tensor print: " << ss.str() << ".";
    }

    rc = di.FetchNextTensorRow(&tensor_list);
    ASSERT_OK(rc);
    row_count++;
  }

  ASSERT_EQ(row_count, 3);
}

TEST_F(MindDataTestTextFileOp, TestTotalRows) {
  std::string tf_file1 = datasets_root_path_ + "/testTextFileDataset/1.txt";
  std::string tf_file2 = datasets_root_path_ + "/testTextFileDataset/2.txt";
  std::vector<std::string> files;
  files.push_back(tf_file1);
  int64_t total_rows = 0;
  TextFileOp::CountAllFileRows(files, &total_rows);
  ASSERT_EQ(total_rows, 3);
  files.clear();

  files.push_back(tf_file2);
  TextFileOp::CountAllFileRows(files, &total_rows);
  ASSERT_EQ(total_rows, 2);
  files.clear();

  files.push_back(tf_file1);
  files.push_back(tf_file2);
  TextFileOp::CountAllFileRows(files, &total_rows);
  ASSERT_EQ(total_rows, 5);
  files.clear();
}

TEST_F(MindDataTestTextFileOp, TestTotalRowsFileNotExist) {
  std::string tf_file1 = datasets_root_path_ + "/does/not/exist/0.txt";
  std::vector<std::string> files;
  files.push_back(tf_file1);
  int64_t total_rows = 0;
  TextFileOp::CountAllFileRows(files, &total_rows);
  ASSERT_EQ(total_rows, 0);
}