/*
    * 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 java.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.artifact.Artifact;
  import org.eclipse.aether.internal.test.util.TestFileUtils;
  import org.eclipse.aether.metadata.Metadata;
  import org.eclipse.aether.spi.connector.ArtifactDownload;
  import org.eclipse.aether.spi.connector.ArtifactUpload;
  import org.eclipse.aether.spi.connector.MetadataDownload;
  import org.eclipse.aether.spi.connector.MetadataUpload;
  import org.eclipse.aether.spi.connector.RepositoryConnector;
  import org.eclipse.aether.spi.connector.Transfer;
  import org.eclipse.aether.transfer.ArtifactTransferException;
  import org.eclipse.aether.transfer.MetadataTransferException;
  import org.eclipse.aether.transfer.TransferEvent;
  import org.eclipse.aether.transfer.TransferListener;
  import org.eclipse.aether.transfer.TransferResource;
  
  import static org.junit.jupiter.api.Assertions.*;
  
  /**
   * A repository connector recording all get/put-requests and faking the results.
   */
  class RecordingRepositoryConnector implements RepositoryConnector {
  
      RepositorySystemSession session;
  
      boolean fail;
  
      private Artifact[] expectGet;
  
      private Artifact[] expectPut;
  
      private Metadata[] expectGetMD;
  
      private Metadata[] expectPutMD;
  
      private List<Artifact> actualGet = new ArrayList<>();
  
      private List<Metadata> actualGetMD = new ArrayList<>();
  
      private List<Artifact> actualPut = new ArrayList<>();
  
      private List<Metadata> actualPutMD = new ArrayList<>();
  
      public RecordingRepositoryConnector(
              RepositorySystemSession session,
              Artifact[] expectGet,
              Artifact[] expectPut,
              Metadata[] expectGetMD,
              Metadata[] expectPutMD) {
          this.session = session;
          this.expectGet = expectGet;
          this.expectPut = expectPut;
          this.expectGetMD = expectGetMD;
          this.expectPutMD = expectPutMD;
      }
  
      public RecordingRepositoryConnector(RepositorySystemSession session) {
          this.session = session;
      }
  
      public RecordingRepositoryConnector() {}
  
      @Override
      public void get(
              Collection<? extends ArtifactDownload> artifactDownloads,
              Collection<? extends MetadataDownload> metadataDownloads) {
          try {
              if (artifactDownloads != null) {
                  for (ArtifactDownload download : artifactDownloads) {
                      fireInitiated(download);
                      Artifact artifact = download.getArtifact();
                      this.actualGet.add(artifact);
                      if (fail) {
                          download.setException(new ArtifactTransferException(artifact, null, "forced failure"));
                      } else {
                         TestFileUtils.writeString(download.getFile(), artifact.toString());
                     }
                     fireDone(download);
                 }
             }
             if (metadataDownloads != null) {
                 for (MetadataDownload download : metadataDownloads) {
                     fireInitiated(download);
                     Metadata metadata = download.getMetadata();
                     this.actualGetMD.add(metadata);
                     if (fail) {
                         download.setException(new MetadataTransferException(metadata, null, "forced failure"));
                     } else {
                         TestFileUtils.writeString(download.getFile(), metadata.toString());
                     }
                     fireDone(download);
                 }
             }
         } catch (Exception e) {
             throw new IllegalStateException(e);
         }
     }
 
     @Override
     public void put(
             Collection<? extends ArtifactUpload> artifactUploads,
             Collection<? extends MetadataUpload> metadataUploads) {
         try {
             if (artifactUploads != null) {
                 for (ArtifactUpload upload : artifactUploads) {
                     // mimic "real" connector
                     fireInitiated(upload);
                     if (upload.getFile() == null) {
                         upload.setException(new ArtifactTransferException(upload.getArtifact(), null, "no file"));
                     } else if (fail) {
                         upload.setException(
                                 new ArtifactTransferException(upload.getArtifact(), null, "forced failure"));
                     }
                     this.actualPut.add(upload.getArtifact());
                     fireDone(upload);
                 }
             }
             if (metadataUploads != null) {
                 for (MetadataUpload upload : metadataUploads) {
                     // mimic "real" connector
                     fireInitiated(upload);
                     if (upload.getFile() == null) {
                         upload.setException(new MetadataTransferException(upload.getMetadata(), null, "no file"));
                     } else if (fail) {
                         upload.setException(
                                 new MetadataTransferException(upload.getMetadata(), null, "forced failure"));
                     }
                     this.actualPutMD.add(upload.getMetadata());
                     fireDone(upload);
                 }
             }
         } catch (Exception e) {
             throw new IllegalStateException(e);
         }
     }
 
     private void fireInitiated(Transfer transfer) throws Exception {
         TransferListener listener = transfer.getListener();
         if (listener == null) {
             return;
         }
         TransferEvent.Builder event =
                 new TransferEvent.Builder(session, new TransferResource(null, null, null, null, transfer.getTrace()));
         event.setType(TransferEvent.EventType.INITIATED);
         listener.transferInitiated(event.build());
     }
 
     private void fireDone(Transfer transfer) {
         TransferListener listener = transfer.getListener();
         if (listener == null) {
             return;
         }
         TransferEvent.Builder event =
                 new TransferEvent.Builder(session, new TransferResource(null, null, null, null, transfer.getTrace()));
         event.setException(transfer.getException());
         if (transfer.getException() != null) {
             listener.transferFailed(
                     event.setType(TransferEvent.EventType.FAILED).build());
         } else {
             listener.transferSucceeded(
                     event.setType(TransferEvent.EventType.SUCCEEDED).build());
         }
     }
 
     @Override
     public void close() {}
 
     public void assertSeenExpected() {
         assertSeenExpected(actualGet, expectGet);
         assertSeenExpected(actualGetMD, expectGetMD);
         assertSeenExpected(actualPut, expectPut);
         assertSeenExpected(actualPutMD, expectPutMD);
     }
 
     private void assertSeenExpected(List<?> actual, Object[] expected) {
         if (expected == null) {
             expected = new Object[0];
         }
 
         assertEquals(expected.length, actual.size(), "different number of expected and actual elements:");
         int idx = 0;
         for (Object actualObject : actual) {
             assertEquals(expected[idx++], actualObject, "seen object differs");
         }
     }
 
     public List<Artifact> getActualArtifactGetRequests() {
         return actualGet;
     }
 
     public List<Metadata> getActualMetadataGetRequests() {
         return actualGetMD;
     }
 
     public List<Artifact> getActualArtifactPutRequests() {
         return actualPut;
     }
 
     public List<Metadata> getActualMetadataPutRequests() {
         return actualPutMD;
     }
 
     public void setExpectGet(Artifact... expectGet) {
         this.expectGet = expectGet;
     }
 
     public void setExpectPut(Artifact... expectPut) {
         this.expectPut = expectPut;
     }
 
     public void setExpectGet(Metadata... expectGetMD) {
         this.expectGetMD = expectGetMD;
     }
 
     public void setExpectPut(Metadata... expectPutMD) {
         this.expectPutMD = expectPutMD;
     }
 
     public void resetActual() {
         this.actualGet = new ArrayList<>();
         this.actualGetMD = new ArrayList<>();
         this.actualPut = new ArrayList<>();
         this.actualPutMD = new ArrayList<>();
     }
 }