/*
 * 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.repository;

import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Collection;

import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.metadata.Metadata;
import org.eclipse.aether.repository.RemoteRepository;
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.transfer.ArtifactNotFoundException;
import org.eclipse.aether.transfer.ArtifactTransferException;
import org.eclipse.aether.transfer.MetadataNotFoundException;
import org.eclipse.aether.transfer.MetadataTransferException;

/**
 */
public class TestRepositoryConnector implements RepositoryConnector {

    private RemoteRepository repository;

    private File basedir;

    public TestRepositoryConnector(RemoteRepository repository) {
        this.repository = repository;
        String repositoryUrl = repository.getUrl();
        if (repositoryUrl.contains("${")) {
            // the repository url contains unresolved properties and getting the basedir is not possible
            // in JDK 20+ 'new URL(string)' will fail if the string contains a curly brace
            this.basedir = null;
        } else {
            try {
                URL url = new URL(repository.getUrl());
                if ("file".equals(url.getProtocol())) {
                    basedir = new File(url.getPath());
                }
            } catch (MalformedURLException e) {
                throw new IllegalStateException(e);
            }
        }
    }

    @Override
    public void close() {}

    @Override
    public void get(
            Collection<? extends ArtifactDownload> artifactDownloads,
            Collection<? extends MetadataDownload> metadataDownloads) {
        if (artifactDownloads != null) {
            for (ArtifactDownload download : artifactDownloads) {
                File remoteFile = new File(basedir, path(download.getArtifact()));
                try {
                    Path dest = download.getPath();
                    Files.createDirectories(dest.getParent());
                    Files.copy(remoteFile.toPath(), dest);
                } catch (IOException e) {
                    if (!remoteFile.exists()) {
                        download.setException(new ArtifactNotFoundException(download.getArtifact(), repository));
                    } else {
                        download.setException(new ArtifactTransferException(download.getArtifact(), repository, e));
                    }
                }
            }
        }
        if (metadataDownloads != null) {
            for (final MetadataDownload download : metadataDownloads) {
                File remoteFile = new File(basedir, path(download.getMetadata()));
                try {
                    Path dest = download.getPath();
                    Files.createDirectories(dest.getParent());
                    Files.copy(remoteFile.toPath(), dest);
                } catch (IOException e) {
                    if (!remoteFile.exists()) {
                        download.setException(new MetadataNotFoundException(download.getMetadata(), repository));
                    } else {
                        download.setException(new MetadataTransferException(download.getMetadata(), repository, e));
                    }
                }
            }
        }
    }

    private String path(Artifact artifact) {
        StringBuilder path = new StringBuilder(128);

        path.append(artifact.getGroupId().replace('.', '/')).append('/');

        path.append(artifact.getArtifactId()).append('/');

        path.append(artifact.getBaseVersion()).append('/');

        path.append(artifact.getArtifactId()).append('-').append(artifact.getVersion());

        if (!artifact.getClassifier().isEmpty()) {
            path.append('-').append(artifact.getClassifier());
        }

        path.append('.').append(artifact.getExtension());

        return path.toString();
    }

    private String path(Metadata metadata) {
        StringBuilder path = new StringBuilder(128);

        if (!metadata.getGroupId().isBlank()) {
            path.append(metadata.getGroupId().replace('.', '/')).append('/');
        }

        if (!metadata.getArtifactId().isBlank()) {
            path.append(metadata.getArtifactId()).append('/');
        }

        path.append(metadata.getType());

        return path.toString();
    }

    @Override
    public void put(
            Collection<? extends ArtifactUpload> artifactUploads,
            Collection<? extends MetadataUpload> metadataUploads) {
        // TODO Auto-generated method stub

    }
}
