/*
    * Copyright 2018 SPF4J.
    *
    * 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 org.spf4j.test.log;
  
  import com.google.common.base.Ascii;
  import com.google.common.base.MoreObjects;
  import com.google.common.collect.Maps;
  import com.google.common.io.Resources;
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.Reader;
  import java.io.UncheckedIOException;
  import java.net.URL;
  import java.nio.charset.StandardCharsets;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.util.Map;
  import java.util.Properties;
  import java.util.Set;
  import javax.annotation.Nullable;
  import javax.annotation.ParametersAreNonnullByDefault;
  import org.spf4j.log.Level;
  
  /**
   *
   * @author Zoltan Farkas
   */
  @ParametersAreNonnullByDefault
  public final class PrintLogConfigsIO {
  
    private PrintLogConfigsIO() {
    }
  
    public static Map<String, PrintConfig> loadConfig(final Path path) throws IOException {
      try (BufferedReader br = Files.newBufferedReader(path, StandardCharsets.UTF_8)) {
        return loadConfig(br);
      }
    }
  
    @Nullable
    public static Map<String, PrintConfig> loadConfigFromResource(final String resourceName) {
      ClassLoader loader = MoreObjects.firstNonNull(
              Thread.currentThread().getContextClassLoader(), Resources.class.getClassLoader());
      URL url = loader.getResource(resourceName);
      if (url == null) {
        return null;
      }
      try (BufferedReader cfgR = Resources.asCharSource(url, StandardCharsets.UTF_8).openBufferedStream()) {
        return loadConfig(cfgR);
      } catch (IOException ex) {
        throw new UncheckedIOException(ex);
      }
    }
  
    public static Map<String, PrintConfig> loadConfig(final Reader reader) throws IOException {
      Properties props = new Properties();
      props.load(reader);
      Map<String, PrintConfig> cfgs = Maps.newHashMapWithExpectedSize(props.size());
      Set<Map.Entry<String, String>> entrySet = (Set) props.entrySet();
      for (Map.Entry<String, String> entry : entrySet) {
        String category = entry.getKey().trim();
        String[] cfg = entry.getValue().trim().split(",");
        int len = cfg.length;
        if (len == 0) {
          throw new IllegalArgumentException("Invalid config entry: " + entry);
        }
        final boolean greedy;
        String lval = cfg[len - 1];
        if (Ascii.equalsIgnoreCase("true", lval)) {
          greedy = true;
          len--;
        } else if (Ascii.equalsIgnoreCase("false", lval)) {
          greedy = false;
          len--;
        } else {
          greedy = false;
        }
        if (len != 1) {
          throw new IllegalArgumentException("Invalid config entry: " + entry);
        }
        final Level minLevel = Level.valueOf(cfg[0]);
        cfgs.put(category, new PrintConfig(category, minLevel, greedy));
      }
      return cfgs;
    }
  
 }