/*
 * Copyright 2013 Netflix, Inc.
 *
 * 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 feign;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.StringWriter;
import java.util.logging.FileHandler;
import java.util.logging.LogRecord;
import java.util.logging.SimpleFormatter;

import static feign.Util.UTF_8;
import static feign.Util.ensureClosed;
import static feign.Util.valuesOrEmpty;

/**
 * Simple logging abstraction for debug messages.  Adapted from {@code retrofit.RestAdapter.Log}.
 */
public abstract class Logger {

  /**
   * Controls the level of logging.
   */
  public enum Level {
    /**
     * No logging.
     */
    NONE,
    /**
     * Log only the request method and URL and the response status code and execution time.
     */
    BASIC,
    /**
     * Log the basic information along with request and response headers.
     */
    HEADERS,
    /**
     * Log the headers, body, and metadata for both requests and responses.
     */
    FULL
  }

  /**
   * logs to the category {@link Logger} at {@link java.util.logging.Level#FINE}.
   */
  public static class ErrorLogger extends Logger {
    final java.util.logging.Logger logger = java.util.logging.Logger.getLogger(Logger.class.getName());

    @Override protected void log(String configKey, String format, Object... args) {
      System.err.printf(methodTag(configKey) + format + "%n", args);
    }
  }

  /**
   * logs to the category {@link Logger} at {@link java.util.logging.Level#FINE}, if loggable.
   */
  public static class JavaLogger extends Logger {
    final java.util.logging.Logger logger =