/*
    * 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.transport.wagon;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.File;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.net.URI;
  import java.nio.charset.StandardCharsets;
  import java.util.Map;
  import java.util.Properties;
  
  import org.apache.maven.wagon.AbstractWagon;
  import org.apache.maven.wagon.ConnectionException;
  import org.apache.maven.wagon.InputData;
  import org.apache.maven.wagon.OutputData;
  import org.apache.maven.wagon.ResourceDoesNotExistException;
  import org.apache.maven.wagon.TransferFailedException;
  import org.apache.maven.wagon.authentication.AuthenticationException;
  import org.apache.maven.wagon.authorization.AuthorizationException;
  import org.apache.maven.wagon.events.TransferEvent;
  import org.apache.maven.wagon.resource.Resource;
  
  /**
   */
  public class MemWagon extends AbstractWagon implements Configurable {
  
      private Map<String, String> fs;
  
      private Properties headers;
  
      private Object config;
  
      public void setConfiguration(Object config) {
          this.config = config;
      }
  
      public Object getConfiguration() {
          return config;
      }
  
      public void setHttpHeaders(Properties httpHeaders) {
          headers = httpHeaders;
      }
  
      @Override
      protected void openConnectionInternal() throws ConnectionException, AuthenticationException {
          fs = MemWagonUtils.openConnection(
                  this,
                  getAuthenticationInfo(),
                  getProxyInfo("mem", getRepository().getHost()),
                  headers);
      }
  
      @Override
      protected void closeConnection() throws ConnectionException {
          fs = null;
      }
  
      private String getData(String resource) {
          return fs.get(URI.create(resource).getSchemeSpecificPart());
      }
  
      @Override
      public boolean resourceExists(String resourceName) throws TransferFailedException, AuthorizationException {
          String data = getData(resourceName);
          return data != null;
      }
  
      @Override
      public void get(String resourceName, File destination)
              throws TransferFailedException, ResourceDoesNotExistException, AuthorizationException {
          getIfNewer(resourceName, destination, 0);
      }
  
      @Override
      public boolean getIfNewer(String resourceName, File destination, long timestamp)
              throws TransferFailedException, ResourceDoesNotExistException, AuthorizationException {
          Resource resource = new Resource(resourceName);
          fireGetInitiated(resource, destination);
          resource.setLastModified(timestamp);
         getTransfer(resource, destination, getInputStream(resource));
         return true;
     }
 
     protected InputStream getInputStream(Resource resource)
             throws TransferFailedException, ResourceDoesNotExistException, AuthorizationException {
         InputData inputData = new InputData();
         inputData.setResource(resource);
         try {
             fillInputData(inputData);
         } catch (TransferFailedException | AuthorizationException | ResourceDoesNotExistException e) {
             fireTransferError(resource, e, TransferEvent.REQUEST_GET);
             cleanupGetTransfer(resource);
             throw e;
         } finally {
             if (inputData.getInputStream() == null) {
                 cleanupGetTransfer(resource);
             }
         }
         return inputData.getInputStream();
     }
 
     protected void fillInputData(InputData inputData)
             throws TransferFailedException, ResourceDoesNotExistException, AuthorizationException {
         String data = getData(inputData.getResource().getName());
         if (data == null) {
             throw new ResourceDoesNotExistException(
                     "Missing resource: " + inputData.getResource().getName());
         }
         byte[] bytes = data.getBytes(StandardCharsets.UTF_8);
         inputData.getResource().setContentLength(bytes.length);
         inputData.setInputStream(new ByteArrayInputStream(bytes));
     }
 
     @Override
     public void put(File source, String resourceName)
             throws TransferFailedException, ResourceDoesNotExistException, AuthorizationException {
         Resource resource = new Resource(resourceName);
         firePutInitiated(resource, source);
         resource.setContentLength(source.length());
         resource.setLastModified(source.lastModified());
         OutputStream os = getOutputStream(resource);
         putTransfer(resource, source, os, true);
     }
 
     protected OutputStream getOutputStream(Resource resource) throws TransferFailedException {
         OutputData outputData = new OutputData();
         outputData.setResource(resource);
         try {
             fillOutputData(outputData);
         } catch (TransferFailedException e) {
             fireTransferError(resource, e, TransferEvent.REQUEST_PUT);
             throw e;
         } finally {
             if (outputData.getOutputStream() == null) {
                 cleanupPutTransfer(resource);
             }
         }
 
         return outputData.getOutputStream();
     }
 
     protected void fillOutputData(OutputData outputData) throws TransferFailedException {
         outputData.setOutputStream(new ByteArrayOutputStream());
     }
 
     @Override
     protected void finishPutTransfer(Resource resource, InputStream input, OutputStream output)
             throws TransferFailedException, AuthorizationException, ResourceDoesNotExistException {
         String data = new String(((ByteArrayOutputStream) output).toByteArray(), StandardCharsets.UTF_8);
         fs.put(URI.create(resource.getName()).getSchemeSpecificPart(), data);
     }
 }