/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 <future>
#include <iostream>
#include <memory>
#include <ostream>
#include <sstream>
#include <string>

#include "hdfs-stat.h"
#include "tools_common.h"

namespace hdfs::tools {
Stat::Stat(const int argc, char **argv) : HdfsTool(argc, argv) {}

bool Stat::Initialize() {
  auto add_options = opt_desc_.add_options();
  add_options("help,h", "Displays the stat information for the given path. The "
                        "path can be a file or a directory.");
  add_options("path", po::value<std::string>(),
              "The path in the filesystem for which to display the "
              "stat information.");

  // We allow only one positional argument to be passed to this tool. An
  // exception is thrown if multiple arguments are passed.
  pos_opt_desc_.add("path", 1);

  po::store(po::command_line_parser(argc_, argv_)
                .options(opt_desc_)
                .positional(pos_opt_desc_)
                .run(),
            opt_val_);
  po::notify(opt_val_);
  return true;
}

std::string Stat::GetDescription() const {
  std::stringstream desc;
  desc << "Usage: hdfs_stat PATH" << std::endl
       << std::endl
       << "Displays the stat information for the given path." << std::endl
       << "The path can be a file or a directory." << std::endl
       << "Examples:" << std::endl
       << "hdfs_stat hdfs://localhost.localdomain:8020/dir/file" << std::endl;
  return desc.str();
}

bool Stat::Do() {
  if (!Initialize()) {
    std::cerr << "Unable to initialize HDFS stat tool" << std::endl;
    return false;
  }

  if (!ValidateConstraints()) {
    std::cout << GetDescription();
    return false;
  }

  if (opt_val_.count("help") > 0) {
    return HandleHelp();
  }

  if (opt_val_.count("path") > 0) {
    const auto path = opt_val_["path"].as<std::string>();
    return HandlePath(path);
  }

  return false;
}

bool Stat::HandleHelp() const {
  std::cout << GetDescription();
  return true;
}

bool Stat::HandlePath(const std::string &path) const {
  // Building a URI object from the given uri_path
  auto uri = hdfs::parse_path_or_exit(path);

  const auto fs = hdfs::doConnect(uri, false);
  if (!fs) {
    std::cerr << "Could not connect the file system. " << std::endl;
    return false;
  }

  hdfs::StatInfo stat_info;
  const auto status = fs->GetFileInfo(uri.get_path(), stat_info);
  if (!status.ok()) {
    std::cerr << "Error: " << status.ToString() << std::endl;
    return false;
  }
  std::cout << stat_info.str() << std::endl;
  return true;
}
} // namespace hdfs::tools
