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/*
 * Copyright 2018 The gRPC Authors
 *
 * Licensed 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.
 */

package io.grpc.internal;

import static com.google.common.base.Preconditions.checkNotNull;

import io.grpc.ChannelLogger;
import io.grpc.InternalChannelz.ChannelTrace.Event;
import io.grpc.InternalChannelz.ChannelTrace.Event.Severity;
import io.grpc.InternalLogId;
import java.text.MessageFormat;
import java.util.logging.Level;

final class ChannelLoggerImpl extends ChannelLogger {
  private final ChannelTracer tracer;
  private final TimeProvider time;

  ChannelLoggerImpl(ChannelTracer tracer, TimeProvider time) {
    this.tracer = checkNotNull(tracer, "tracer");
    this.time = checkNotNull(time, "time");
  }

  @Override
  public void log(ChannelLogLevel level, String msg) {
    logOnly(tracer.getLogId(), level, msg);
    if (isTraceable(level)) {
      trace(level, msg);
    }
  }

  @Override
  public void log(ChannelLogLevel level, String messageFormat, Object... args) {
    String msg = null;
    Level javaLogLevel = toJavaLogLevel(level);
    if (isTraceable(level) || ChannelTracer.logger.isLoggable(javaLogLevel)) {
      msg = MessageFormat.format(messageFormat, args);
    }
    log(level, msg);
  }

  static void logOnly(InternalLogId logId, ChannelLogLevel level, String msg) {
    Level javaLogLevel = toJavaLogLevel(level);
    if (ChannelTracer.logger.isLoggable(javaLogLevel)) {
      ChannelTracer.logOnly(logId, javaLogLevel, msg);
    }
  }

  static void logOnly(
      InternalLogId logId, ChannelLogLevel level, String messageFormat, Object... args) {
    Level javaLogLevel = toJavaLogLevel(level);
    if (ChannelTracer.logger.isLoggable(javaLogLevel)) {
      String msg = MessageFormat.format(messageFormat, args);
      ChannelTracer.logOnly(logId, javaLogLevel, msg);
    }
  }

  private boolean isTraceable(ChannelLogLevel level) {
    return level != ChannelLogLevel.DEBUG && tracer.isTraceEnabled();
  }

  private void trace(ChannelLogLevel level, String msg) {
    if (level == ChannelLogLevel.DEBUG) {
      return;
    }
    tracer.traceOnly(new Event.Builder()
        .setDescription(msg)
        .setSeverity(toTracerSeverity(level))
        .setTimestampNanos(time.currentTimeNanos())
        .build());
  }

  private static Severity toTracerSeverity(ChannelLogLevel level) {
    switch (level) {
      case ERROR:
        return Severity.CT_ERROR;
      case WARNING:
        return Severity.CT_WARNING;
      default:
        return Severity.CT_INFO;
    }
  }

  private static Level toJavaLogLevel(ChannelLogLevel level) {
    switch (level) {
      case ERROR:
      case WARNING:
        return Level.FINE;
      case INFO:
        return Level.FINER;
      default:
        return Level.FINEST;
    }
  }
}