/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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 org.eclipse.aether.internal.impl.slf4j;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import org.eclipse.aether.spi.locator.Service;
  import org.eclipse.aether.spi.locator.ServiceLocator;
  import org.eclipse.aether.spi.log.Logger;
  import org.eclipse.aether.spi.log.LoggerFactory;
  import org.eclipse.sisu.Nullable;
  import org.slf4j.ILoggerFactory;
  import org.slf4j.spi.LocationAwareLogger;
  
  /**
   * A logger factory that delegates to <a href="http://www.slf4j.org/" target="_blank">SLF4J</a> logging.
   *
   * @deprecated Use SLF4J instead
   */
  @Singleton
  @Named("slf4j")
  @Deprecated
  public class Slf4jLoggerFactory implements LoggerFactory, Service {
  
      private static final boolean AVAILABLE;
  
      static {
          boolean available;
          try {
              Slf4jLoggerFactory.class.getClassLoader().loadClass("org.slf4j.ILoggerFactory");
              available = true;
          } catch (Exception | LinkageError e) {
              available = false;
          }
          AVAILABLE = available;
      }
  
      public static boolean isSlf4jAvailable() {
          return AVAILABLE;
      }
  
      private ILoggerFactory factory;
  
      /**
       * Creates an instance of this logger factory.
       */
      public Slf4jLoggerFactory() {
          // enables no-arg constructor
      }
  
      @Inject
      Slf4jLoggerFactory(@Nullable ILoggerFactory factory) {
          setLoggerFactory(factory);
      }
  
      public void initService(ServiceLocator locator) {
          setLoggerFactory(locator.getService(ILoggerFactory.class));
      }
  
      public Slf4jLoggerFactory setLoggerFactory(ILoggerFactory factory) {
          this.factory = factory;
          return this;
      }
  
      public Logger getLogger(String name) {
          org.slf4j.Logger logger = getFactory().getLogger(name);
          if (logger instanceof LocationAwareLogger) {
              return new Slf4jLoggerEx((LocationAwareLogger) logger);
          }
          return new Slf4jLogger(logger);
      }
  
      private ILoggerFactory getFactory() {
          if (factory == null) {
              factory = org.slf4j.LoggerFactory.getILoggerFactory();
          }
          return factory;
      }
  
      private static final class Slf4jLogger implements Logger {
  
         private final org.slf4j.Logger logger;
 
         Slf4jLogger(org.slf4j.Logger logger) {
             this.logger = logger;
         }
 
         public boolean isDebugEnabled() {
             return logger.isDebugEnabled();
         }
 
         public void debug(String msg) {
             logger.debug(msg);
         }
 
         public void debug(String msg, Throwable error) {
             logger.debug(msg, error);
         }
 
         public boolean isWarnEnabled() {
             return logger.isWarnEnabled();
         }
 
         public void warn(String msg) {
             logger.warn(msg);
         }
 
         public void warn(String msg, Throwable error) {
             logger.warn(msg, error);
         }
     }
 
     private static final class Slf4jLoggerEx implements Logger {
 
         private static final String FQCN = Slf4jLoggerEx.class.getName();
 
         private final LocationAwareLogger logger;
 
         Slf4jLoggerEx(LocationAwareLogger logger) {
             this.logger = logger;
         }
 
         public boolean isDebugEnabled() {
             return logger.isDebugEnabled();
         }
 
         public void debug(String msg) {
             logger.log(null, FQCN, LocationAwareLogger.DEBUG_INT, msg, null, null);
         }
 
         public void debug(String msg, Throwable error) {
             logger.log(null, FQCN, LocationAwareLogger.DEBUG_INT, msg, null, error);
         }
 
         public boolean isWarnEnabled() {
             return logger.isWarnEnabled();
         }
 
         public void warn(String msg) {
             logger.log(null, FQCN, LocationAwareLogger.WARN_INT, msg, null, null);
         }
 
         public void warn(String msg, Throwable error) {
             logger.log(null, FQCN, LocationAwareLogger.WARN_INT, msg, null, error);
         }
     }
 }