/*
    * 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;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.impl.RepositoryConnectorProvider;
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.spi.connector.PipelineRepositoryConnectorFactory;
  import org.eclipse.aether.spi.connector.RepositoryConnector;
  import org.eclipse.aether.spi.connector.RepositoryConnectorFactory;
  import org.eclipse.aether.transfer.NoRepositoryConnectorException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   */
  @Singleton
  @Named
  public class DefaultRepositoryConnectorProvider implements RepositoryConnectorProvider {
  
      private static final Logger LOGGER = LoggerFactory.getLogger(DefaultRepositoryConnectorProvider.class);
  
      private final Map<String, RepositoryConnectorFactory> connectorFactories;
  
      private final Map<String, PipelineRepositoryConnectorFactory> pipelineConnectorFactories;
  
      @Inject
      public DefaultRepositoryConnectorProvider(
              Map<String, RepositoryConnectorFactory> connectorFactories,
              Map<String, PipelineRepositoryConnectorFactory> pipelineConnectorFactories) {
          this.connectorFactories = Collections.unmodifiableMap(connectorFactories);
          this.pipelineConnectorFactories = Collections.unmodifiableMap(pipelineConnectorFactories);
      }
  
      @Override
      public RepositoryConnector newRepositoryConnector(RepositorySystemSession session, RemoteRepository repository)
              throws NoRepositoryConnectorException {
          requireNonNull(repository, "remote repository cannot be null");
  
          if (repository.isBlocked()) {
              if (repository.getMirroredRepositories().isEmpty()) {
                  throw new NoRepositoryConnectorException(repository, "Blocked repository: " + repository);
              } else {
                  throw new NoRepositoryConnectorException(
                          repository, "Blocked mirror for repositories: " + repository.getMirroredRepositories());
              }
          }
  
          PrioritizedComponents<RepositoryConnectorFactory> factories = PrioritizedComponents.reuseOrCreate(
                  session, RepositoryConnectorFactory.class, connectorFactories, RepositoryConnectorFactory::getPriority);
  
          LOGGER.debug("Selecting RepositoryConnector for {}", repository);
  
          List<NoRepositoryConnectorException> errors = new ArrayList<>();
          for (PrioritizedComponent<RepositoryConnectorFactory> factory : factories.getEnabled()) {
              try {
                  RepositoryConnector connector = factory.getComponent().newInstance(session, repository);
  
                  if (LOGGER.isDebugEnabled()) {
                      StringBuilder buffer = new StringBuilder(256);
                      buffer.append("Using connector ")
                              .append(connector.getClass().getSimpleName());
                      Utils.appendClassLoader(buffer, connector);
                      buffer.append(" with priority ").append(factory.getPriority());
                      buffer.append(" for ").append(repository.getUrl());
                      LOGGER.debug(buffer.toString());
                  }
  
                  connector = pipelineConnector(session, repository, connector);
  
                  if (LOGGER.isDebugEnabled()) {
                      LOGGER.debug("Final pipeline: {}", connector);
                 }
 
                 return connector;
             } catch (NoRepositoryConnectorException e) {
                 // continue and try next factory
                 if (LOGGER.isTraceEnabled()) {
                     LOGGER.trace(
                             "Connector factory {} did not provide connector for {}",
                             factory.getComponent().getClass(),
                             repository,
                             e);
                 } else {
                     LOGGER.debug(
                             "Connector factory {} did not provide connector for {}: {}",
                             factory.getComponent().getClass(),
                             repository,
                             e.getMessage());
                 }
                 errors.add(e);
             }
         }
 
         StringBuilder buffer = new StringBuilder(256);
         if (factories.isEmpty()) {
             buffer.append("No connector factories available");
         } else {
             buffer.append("Cannot access ").append(repository.getUrl());
             buffer.append(" with type ").append(repository.getContentType());
             buffer.append(" using the available connector factories: ");
             factories.list(buffer);
         }
 
         // create exception: if one error, make it cause
         NoRepositoryConnectorException ex = new NoRepositoryConnectorException(
                 repository, buffer.toString(), errors.size() == 1 ? errors.get(0) : null);
         // if more errors, make them all suppressed
         if (errors.size() > 1) {
             errors.forEach(ex::addSuppressed);
         }
         throw ex;
     }
 
     protected RepositoryConnector pipelineConnector(
             RepositorySystemSession session, RemoteRepository repository, RepositoryConnector delegate) {
         PrioritizedComponents<PipelineRepositoryConnectorFactory> factories = PrioritizedComponents.reuseOrCreate(
                 session,
                 PipelineRepositoryConnectorFactory.class,
                 pipelineConnectorFactories,
                 PipelineRepositoryConnectorFactory::getPriority);
         for (PrioritizedComponent<PipelineRepositoryConnectorFactory> factory : factories.getEnabled()) {
             delegate = factory.getComponent().newInstance(session, repository, delegate);
         }
         return delegate;
     }
 }