/*
 *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

package org.webrtc;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.EnumSet;
import org.webrtc.Loggable;

/**
 * Java wrapper for WebRTC logging. Logging defaults to java.util.logging.Logger, but a custom
 * logger implementing the Loggable interface can be injected along with a Severity. All subsequent
 * log messages will then be redirected to the injected Loggable, except those with a severity lower
 * than the specified severity, which will be discarded.
 *
 * Injecting a Loggable or using any of the enable... methods requires that the native library is
 * loaded, using PeerConnectionFactory.initialize.
 */
public class Logging {
  private static Loggable loggable = new FallbackLogger();
  private static Severity loggableSeverity = Severity.LS_SENSITIVE;

  static void injectLoggable(Loggable injectedLoggable, Severity severity) {
    if (injectedLoggable != null) {
      loggable = injectedLoggable;
      loggableSeverity = severity;
    }
  }

  static void deleteInjectedLoggable() {
    loggable = new FallbackLogger();
    loggableSeverity = Severity.LS_SENSITIVE;
  }

  // TODO(solenberg): Remove once dependent projects updated.
  @Deprecated
  public enum TraceLevel {
    TRACE_NONE(0x0000),
    TRACE_STATEINFO(0x0001),
    TRACE_WARNING(0x0002),
    TRACE_ERROR(0x0004),
    TRACE_CRITICAL(0x0008),
    TRACE_APICALL(0x0010),
    TRACE_DEFAULT(0x00ff),
    TRACE_MODULECALL(0x0020),
    TRACE_MEMORY(0x0100),
    TRACE_TIMER(0x0200),
    TRACE_STREAM(0x0400),
    TRACE_DEBUG(0x0800),
    TRACE_INFO(0x1000),
    TRACE_TERSEINFO(0x2000),
    TRACE_ALL(0xffff);

    public final int level;
    TraceLevel(int level) {
      this.level = level;
    }
  }

  // Keep in sync with webrtc/rtc_base/logging.h:LoggingSeverity.
  public enum Severity { LS_SENSITIVE, LS_VERBOSE, LS_INFO, LS_WARNING, LS_ERROR, LS_NONE }

  public static void enableLogThreads() {
    nativeEnableLogThreads();
  }

  public static void enableLogTimeStamps() {
    nativeEnableLogTimeStamps();
  }

  // TODO(solenberg): Remove once dependent projects updated.
  @Deprecated
  public static void enableTracing(String path, EnumSet<TraceLevel> levels) {}

  // Enable diagnostic logging for messages of |severity| to the platform debug
  // output. On Android, the output will be directed to Logcat.
  // Note: this function starts collecting the output of the RTC_LOG() macros.
  // TODO(bugs.webrtc.org/8491): Remove NoSynchronizedMethodCheck suppression.
  @SuppressWarnings("NoSynchronizedMethodCheck")
  public static synchronized void enableLogToDebugOutput(Severity severity) {
    loggable = new NativeLogger(severity);
    loggableSeverity = severity;
  }

  public static void log(Severity severity, String tag, String message) {
    // Filter log messages below loggableSeverity.
    if (severity.ordinal() < loggableSeverity.ordinal()) {
      return;
    }
    loggable.onLogMessage(message, severity, tag);
  }

  public static void d(String tag, String message) {
    log(Severity.LS_INFO, tag, message);
  }

  public static void e(String tag, String message) {
    log(Severity.LS_ERROR, tag, message);
  }

  public static void w(String tag, String message) {
    log(Severity.LS_WARNING, tag, message);
  }

  public static void e(String tag, String message, Throwable e) {
    log(Severity.LS_ERROR, tag, message);
    log(Severity.LS_ERROR, tag, e.toString());
    log(Severity.LS_ERROR, tag, getStackTraceString(e));
  }

  public static void w(String tag, String message, Throwable e) {
    log(Severity.LS_WARNING, tag, message);
    log(Severity.LS_WARNING, tag, e.toString());
    log(Severity.LS_WARNING, tag, getStackTraceString(e));
  }

  public static void v(String tag, String message) {
    log(Severity.LS_VERBOSE, tag, message);
  }

  private static String getStackTraceString(Throwable e) {
    if (e == null) {
      return "";
    }

    StringWriter sw = new StringWriter();
    PrintWriter pw = new PrintWriter(sw);
    e.printStackTrace(pw);
    return sw.toString();
  }

  private static native void nativeEnableLogThreads();
  private static native void nativeEnableLogTimeStamps();
}