// Tencent is pleased to support the open source community by making RapidJSON available.
//
// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
//
// Licensed under the MIT License (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
// http://opensource.org/licenses/MIT
//
// 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 "unittest.h"
#include "rapidjson/filereadstream.h"
#include "rapidjson/filewritestream.h"
#include "rapidjson/encodedstream.h"

using namespace rapidjson;

class FileStreamTest : public ::testing::Test
{
public:
  FileStreamTest() : filename_(), json_(), length_() {}
  virtual ~FileStreamTest();

  virtual void SetUp()
  { const char *paths[] =
    { "data/sample.json",
      "bin/data/sample.json",
      "../bin/data/sample.json",
      "../../bin/data/sample.json",
      "../../../bin/data/sample.json"
    };
    FILE* fp = 0;
    for (size_t i = 0; i < sizeof(paths) / sizeof(paths[0]); i++)
    { fp = fopen(paths[i], "rb");
      if (fp)
      { filename_ = paths[i];
        break;
      }
    }
    ASSERT_TRUE(fp != 0);

    fseek(fp, 0, SEEK_END);
    length_ = static_cast<size_t>(ftell(fp));
    fseek(fp, 0, SEEK_SET);
    json_ = static_cast<char*>(malloc(length_ + 1));
    size_t readLength = fread(json_, 1, length_, fp);
    json_[readLength] = '\0';
    fclose(fp);
  }

  virtual void TearDown()
  { free(json_);
    json_ = 0;
  }

private:
  FileStreamTest(const FileStreamTest&);
  FileStreamTest& operator=(const FileStreamTest&);

protected:
  const char* filename_;
  char *json_;
  size_t length_;
};

FileStreamTest::~FileStreamTest() {}

TEST_F(FileStreamTest, FileReadStream)
{ FILE *fp = fopen(filename_, "rb");
  ASSERT_TRUE(fp != 0);
  char buffer[65536];
  FileReadStream s(fp, buffer, sizeof(buffer));

  for (size_t i = 0; i < length_; i++)
  { EXPECT_EQ(json_[i], s.Peek());
    EXPECT_EQ(json_[i], s.Peek());  // 2nd time should be the same
    EXPECT_EQ(json_[i], s.Take());
  }

  EXPECT_EQ(length_, s.Tell());
  EXPECT_EQ('\0', s.Peek());

  fclose(fp);
}

TEST_F(FileStreamTest, FileWriteStream)
{ char filename[L_tmpnam];
  FILE* fp = TempFile(filename);

  char buffer[65536];
  FileWriteStream os(fp, buffer, sizeof(buffer));
  for (size_t i = 0; i < length_; i++)
    os.Put(json_[i]);
  os.Flush();
  fclose(fp);

  // Read it back to verify
  fp = fopen(filename, "rb");
  FileReadStream is(fp, buffer, sizeof(buffer));

  for (size_t i = 0; i < length_; i++)
    EXPECT_EQ(json_[i], is.Take());

  EXPECT_EQ(length_, is.Tell());
  fclose(fp);

  //std::cout << filename << std::endl;
  remove(filename);
}
