/*
 * 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.synccontext.named;

import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Path;
import java.util.Collection;
import java.util.stream.Collectors;

import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.metadata.Metadata;
import org.eclipse.aether.named.NamedLockKey;
import org.eclipse.aether.util.DirectoryUtils;

import static java.util.Objects.requireNonNull;

/**
 * Wrapping {@link NameMapper} class that is file system friendly: it wraps another
 * {@link NameMapper} and resolves the resulting "file system friendly" names against local
 * repository basedir.
 *
 * @since 1.9.0
 */
public class BasedirNameMapper implements NameMapper {
    /**
     * The location of the directory toi use for locks. If relative path, it is resolved from the local repository root.
     *
     * @configurationSource {@link RepositorySystemSession#getConfigProperties()}
     * @configurationType {@link java.lang.String}
     * @configurationDefaultValue {@link #DEFAULT_LOCKS_DIR}
     */
    public static final String CONFIG_PROP_LOCKS_DIR = NamedLockFactoryAdapter.CONFIG_PROPS_PREFIX + "basedir.locksDir";

    public static final String DEFAULT_LOCKS_DIR = ".locks";

    private final NameMapper delegate;

    private final Path basePath;

    public BasedirNameMapper(final NameMapper delegate) {
        this(delegate, null);
    }

    /**
     * Creates basedir name mapper with provided path as base.
     *
     * @param delegate The delegate to resolve against basedir, must not be {@code null}. The delegate must be
     *                 "file system friendly", see {@link NameMapper#isFileSystemFriendly()} method.
     * @param path The basedir, may be {@code null} in which case given session local repository root is used as
     *             basedir.
     * @since 2.0.0
     */
    public BasedirNameMapper(final NameMapper delegate, final Path path) {
        requireNonNull(delegate);
        if (!delegate.isFileSystemFriendly()) {
            throw new IllegalArgumentException("delegate must be file-system friendly");
        }
        this.delegate = delegate;
        this.basePath = path;
    }

    @Override
    public boolean isFileSystemFriendly() {
        return true; // it enforces delegate to be friendly, and itself produces friendly names
    }

    @Override
    public Collection<NamedLockKey> nameLocks(
            final RepositorySystemSession session,
            final Collection<? extends Artifact> artifacts,
            final Collection<? extends Metadata> metadatas) {
        try {
            final Path basedir = basePath != null
                    ? basePath
                    : DirectoryUtils.resolveDirectory(session, DEFAULT_LOCKS_DIR, CONFIG_PROP_LOCKS_DIR, false);

            return delegate.nameLocks(session, artifacts, metadatas).stream()
                    .map(k -> NamedLockKey.of(
                            basedir.resolve(k.name()).toAbsolutePath().toUri().toASCIIString(), k.resources()))
                    .collect(Collectors.toList());
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }
}
