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#include "base/log_file.h"

#include <string>

#include "absl/base/thread_annotations.h"
#include "absl/log/initialize.h"
#include "absl/log/log_entry.h"
#include "absl/log/log_sink.h"
#include "absl/log/log_sink_registry.h"
#include "absl/synchronization/mutex.h"
#include "base/file_stream.h"

namespace mozc {
namespace {

class LogFileSink : public absl::LogSink {
 public:
  explicit LogFileSink(const std::string& path) : file_(path) {}

  void Send(const absl::LogEntry& entry) override {
    absl::MutexLock lock(mutex_);
    file_ << entry.text_message_with_prefix_and_newline();
  }

  void Flush() override {
    absl::MutexLock lock(mutex_);
    file_.flush();
  }

 private:
  absl::Mutex mutex_;
  OutputFileStream file_ ABSL_GUARDED_BY(mutex_);
};

}  // namespace

void RegisterLogFileSink(const std::string& path) {
#if !defined(NDEBUG) && !defined(__ANDROID__)
  absl::InitializeLog();
  absl::AddLogSink(new LogFileSink(path));
#endif  // !NDEBUG && !__ANDROID__
}

}  // namespace mozc
