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#include "usage_stats/usage_stats_uploader.h"

#include <utility>
#include <vector>

#include "storage/registry.h"

namespace mozc {
namespace usage_stats {

namespace {
const char kRegistryPrefix[] = "usage_stats.";
const char kLastUploadKey[] = "last_upload";
const char kMozcVersionKey[] = "mozc_version";
const char kClientIdKey[] = "client_id";
}  // namespace

bool UsageStatsUploader::Send(void *data) {
  // Clear local data in the case of migration.
  // This UsageStatsUploader::Send() may be registered to Scheduler in
  // SessionServer and called periodically.
  ClearMetaData();
  return true;
}

void UsageStatsUploader::ClearMetaData() {
  const std::string upload_key = std::string(kRegistryPrefix) + kLastUploadKey;
  const std::string mozc_version_key =
      std::string(kRegistryPrefix) + kMozcVersionKey;
  const std::string client_id_key =
      std::string(kRegistryPrefix) + std::string(kClientIdKey);
  storage::Registry::Erase(upload_key);
  storage::Registry::Erase(mozc_version_key);
  storage::Registry::Erase(client_id_key);
}

}  // namespace usage_stats
}  // namespace mozc
