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#ifndef MOZC_CHROME_NACL_DICTIONARY_DOWNLOADER_H_
#define MOZC_CHROME_NACL_DICTIONARY_DOWNLOADER_H_

#include <string>

#include "base/port.h"
#include "base/scoped_ptr.h"

namespace mozc {
namespace chrome {
namespace nacl {

class DictionaryDownloader {
 public:
  enum DownloadStatus {
    DOWNLOAD_INITIALIZED,
    DOWNLOAD_PENDING,
    DOWNLOAD_STARTED,
    DOWNLOAD_FINISHED,
    DOWNLOAD_WAITING_FOR_RETRY,
    DOWNLOAD_ERROR
  };
  DictionaryDownloader(const string &url,
                       const string &file_name);
  ~DictionaryDownloader();
  // Sets the options.
  void SetOption(uint32 start_delay,
                 uint32 random_delay,
                 uint32 retry_interval,
                 uint32 retry_backoff_count,
                 uint32 max_retry);
  // Downloading will be started after start_delay + [0 - random_delay] msec.
  // If failed, 1st retry is started after retry_interval + [0 - random_delay].
  // While the retry count is less than retry_backoff_count, retry_interval will
  // be doubled.
  void StartDownload();
  DownloadStatus GetStatus();

 private:
  class Impl;
  scoped_ptr<Impl> impl_;
  DISALLOW_COPY_AND_ASSIGN(DictionaryDownloader);
};

}  // namespace nacl
}  // namespace chrome
}  // namespace mozc

#endif  // MOZC_CHROME_NACL_DICTIONARY_DOWNLOADER_H_