/*
    * 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.apache.maven.settings;
  
  import java.io.IOError;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.io.PrintStream;
  import java.io.PrintWriter;
  import java.io.Reader;
  import java.io.Writer;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Enumeration;
  import java.util.InvalidPropertiesFormatException;
  import java.util.Map;
  import java.util.Properties;
  import java.util.Set;
  import java.util.function.BiConsumer;
  import java.util.function.BiFunction;
  import java.util.function.Consumer;
  import java.util.function.Function;
  import java.util.function.Supplier;
  
  class WrapperProperties extends Properties {
  
      final Supplier<Map<String, String>> getter;
      final Consumer<Properties> setter;
  
      WrapperProperties(Supplier<Map<String, String>> getter, Consumer<Properties> setter) {
          this.getter = getter;
          this.setter = setter;
      }
  
      @Override
      public String getProperty(String key) {
          return getter.get().get(key);
      }
  
      @Override
      public String getProperty(String key, String defaultValue) {
          return getter.get().getOrDefault(key, defaultValue);
      }
  
      @Override
      public Enumeration<?> propertyNames() {
          return Collections.enumeration(getter.get().keySet());
      }
  
      @Override
      public Set<String> stringPropertyNames() {
          return getter.get().keySet();
      }
  
      @Override
      public void list(PrintStream out) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public void list(PrintWriter out) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public int size() {
          return getter.get().size();
      }
  
      @Override
      public boolean isEmpty() {
          return getter.get().isEmpty();
      }
  
      @Override
      public Enumeration<Object> keys() {
          return Collections.enumeration((Set) getter.get().keySet());
      }
  
      @Override
      public Enumeration<Object> elements() {
          return Collections.enumeration((Collection) getter.get().values());
     }
 
     @Override
     public boolean contains(Object value) {
         return getter.get().containsKey(value != null ? value.toString() : null);
     }
 
     @Override
     public boolean containsValue(Object value) {
         return getter.get().containsValue(value);
     }
 
     @Override
     public boolean containsKey(Object key) {
         return getter.get().containsKey(key);
     }
 
     @Override
     public Object get(Object key) {
         return getter.get().get(key);
     }
 
     @Override
     public synchronized String toString() {
         return getter.get().toString();
     }
 
     @Override
     public Set<Object> keySet() {
         return (Set) getter.get().keySet();
     }
 
     @Override
     public Collection<Object> values() {
         return (Collection) getter.get().values();
     }
 
     @Override
     public Set<Map.Entry<Object, Object>> entrySet() {
         return (Set) getter.get().entrySet();
     }
 
     @Override
     public synchronized boolean equals(Object o) {
         if (o instanceof WrapperProperties) {
             o = ((WrapperProperties) o).getter.get();
         }
         return getter.get().equals(o);
     }
 
     @Override
     public synchronized int hashCode() {
         return getter.get().hashCode();
     }
 
     @Override
     public Object getOrDefault(Object key, Object defaultValue) {
         return getter.get().getOrDefault(key, defaultValue != null ? defaultValue.toString() : null);
     }
 
     @Override
     public synchronized void forEach(BiConsumer<? super Object, ? super Object> action) {
         getter.get().forEach(action);
     }
 
     interface WriteOp<T> {
         T perform(Properties props);
     }
 
     interface WriteOpVoid {
         void perform(Properties props);
     }
 
     private <T> T writeOperation(WriteOp<T> runner) {
         Properties props = new Properties();
         props.putAll(getter.get());
         T ret = runner.perform(props);
         if (!props.equals(getter.get())) {
             setter.accept(props);
         }
         return ret;
     }
 
     private void writeOperationVoid(WriteOpVoid runner) {
         Properties props = new Properties();
         props.putAll(getter.get());
         runner.perform(props);
         if (!props.equals(getter.get())) {
             setter.accept(props);
         }
     }
 
     @Override
     public synchronized Object setProperty(String key, String value) {
         return writeOperation(p -> p.setProperty(key, value));
     }
 
     @Override
     public synchronized Object put(Object key, Object value) {
         return writeOperation(p -> p.put(key, value));
     }
 
     @Override
     public synchronized Object remove(Object key) {
         return writeOperation(p -> p.remove(key));
     }
 
     @Override
     public synchronized void putAll(Map<?, ?> t) {
         writeOperationVoid(p -> p.putAll(t));
     }
 
     @Override
     public synchronized void clear() {
         writeOperationVoid(Properties::clear);
     }
 
     @Override
     public synchronized void replaceAll(BiFunction<? super Object, ? super Object, ?> function) {
         writeOperationVoid(p -> p.replaceAll(function));
     }
 
     @Override
     public synchronized Object putIfAbsent(Object key, Object value) {
         return writeOperation(p -> p.putIfAbsent(key, value));
     }
 
     @Override
     public synchronized boolean remove(Object key, Object value) {
         return writeOperation(p -> p.remove(key, value));
     }
 
     @Override
     public synchronized boolean replace(Object key, Object oldValue, Object newValue) {
         return writeOperation(p -> p.replace(key, oldValue, newValue));
     }
 
     @Override
     public synchronized Object replace(Object key, Object value) {
         return writeOperation(p -> p.replace(key, value));
     }
 
     @Override
     public synchronized Object computeIfAbsent(Object key, Function<? super Object, ?> mappingFunction) {
         return writeOperation(p -> p.computeIfAbsent(key, mappingFunction));
     }
 
     @Override
     public synchronized Object computeIfPresent(
             Object key, BiFunction<? super Object, ? super Object, ?> remappingFunction) {
         return writeOperation(p -> p.computeIfPresent(key, remappingFunction));
     }
 
     @Override
     public synchronized Object compute(Object key, BiFunction<? super Object, ? super Object, ?> remappingFunction) {
         return writeOperation(p -> p.compute(key, remappingFunction));
     }
 
     @Override
     public synchronized Object merge(
             Object key, Object value, BiFunction<? super Object, ? super Object, ?> remappingFunction) {
         return writeOperation(p -> p.merge(key, value, remappingFunction));
     }
 
     @Override
     public synchronized void load(Reader reader) throws IOException {
         try {
             writeOperationVoid(p -> {
                 try {
                     p.load(reader);
                 } catch (IOException e) {
                     throw new IOError(e);
                 }
             });
         } catch (IOError e) {
             throw (IOException) e.getCause();
         }
     }
 
     @Override
     public synchronized void load(InputStream inStream) throws IOException {
         try {
             writeOperationVoid(p -> {
                 try {
                     p.load(inStream);
                 } catch (IOException e) {
                     throw new IOError(e);
                 }
             });
         } catch (IOError e) {
             throw (IOException) e.getCause();
         }
     }
 
     @Override
     public void save(OutputStream out, String comments) {
         Properties props = new Properties();
         props.putAll(getter.get());
         props.save(out, comments);
     }
 
     @Override
     public void store(Writer writer, String comments) throws IOException {
         Properties props = new Properties();
         props.putAll(getter.get());
         props.store(writer, comments);
     }
 
     @Override
     public void store(OutputStream out, String comments) throws IOException {
         Properties props = new Properties();
         props.putAll(getter.get());
         props.store(out, comments);
     }
 
     @Override
     public synchronized void loadFromXML(InputStream in) throws IOException, InvalidPropertiesFormatException {
         throw new UnsupportedOperationException();
     }
 
     @Override
     public void storeToXML(OutputStream os, String comment) throws IOException {
         Properties props = new Properties();
         props.putAll(getter.get());
         props.storeToXML(os, comment);
     }
 
     @Override
     public void storeToXML(OutputStream os, String comment, String encoding) throws IOException {
         Properties props = new Properties();
         props.putAll(getter.get());
         props.storeToXML(os, comment, encoding);
     }
 }