/*
 * 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.impl.resolver;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.apache.maven.api.Language;
import org.apache.maven.api.model.DependencyManagement;
import org.apache.maven.api.model.DistributionManagement;
import org.apache.maven.api.model.License;
import org.apache.maven.api.model.Model;
import org.apache.maven.api.model.Prerequisites;
import org.apache.maven.api.model.Repository;
import org.apache.maven.api.services.RepositoryFactory;
import org.apache.maven.impl.InternalSession;
import org.apache.maven.impl.resolver.artifact.MavenArtifactProperties;
import org.apache.maven.impl.resolver.type.DefaultType;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.artifact.ArtifactProperties;
import org.eclipse.aether.artifact.ArtifactType;
import org.eclipse.aether.artifact.ArtifactTypeRegistry;
import org.eclipse.aether.artifact.DefaultArtifact;
import org.eclipse.aether.graph.Dependency;
import org.eclipse.aether.graph.Exclusion;
import org.eclipse.aether.resolution.ArtifactDescriptorResult;

/**
 * Populates Aether {@link ArtifactDescriptorResult} from Maven project {@link Model}.
 * <p>
 * <strong>Note:</strong> This class is part of work in progress and can be changed or removed without notice.
 * @since 3.2.4
 */
public class ArtifactDescriptorReaderDelegate {
    public void populateResult(InternalSession session, ArtifactDescriptorResult result, Model model) {
        ArtifactTypeRegistry stereotypes = session.getSession().getArtifactTypeRegistry();

        for (Repository r : model.getRepositories()) {
            if (containsPlaceholder(r.getId()) || containsPlaceholder(r.getUrl())) {
                continue;
            }
            result.addRepository(session.toRepository(
                    session.getService(RepositoryFactory.class).createRemote(r)));
        }

        for (org.apache.maven.api.model.Dependency dependency : model.getDependencies()) {
            if (hasUninterpolatedExpression(dependency)) {
                continue;
            }
            result.addDependency(convert(dependency, stereotypes));
        }

        DependencyManagement mgmt = model.getDependencyManagement();
        if (mgmt != null) {
            for (org.apache.maven.api.model.Dependency dependency : mgmt.getDependencies()) {
                if (hasUninterpolatedExpression(dependency)) {
                    continue;
                }
                result.addManagedDependency(convert(dependency, stereotypes));
            }
        }

        Map<String, Object> properties = new LinkedHashMap<>();

        Prerequisites prerequisites = model.getPrerequisites();
        if (prerequisites != null) {
            properties.put("prerequisites.maven", prerequisites.getMaven());
        }

        List<License> licenses = model.getLicenses();
        properties.put("license.count", licenses.size());
        for (int i = 0; i < licenses.size(); i++) {
            License license = licenses.get(i);
            properties.put("license." + i + ".name", license.getName());
            properties.put("license." + i + ".url", license.getUrl());
            properties.put("license." + i + ".comments", license.getComments());
            properties.put("license." + i + ".distribution", license.getDistribution());
        }

        result.setProperties(properties);

        setArtifactProperties(result, model);
    }

    private Dependency convert(org.apache.maven.api.model.Dependency dependency, ArtifactTypeRegistry stereotypes) {
        ArtifactType stereotype = stereotypes.get(dependency.getType());
        if (stereotype == null) {
            // TODO: this here is fishy
            stereotype = new DefaultType(dependency.getType(), Language.NONE, "", null, false);
        }

        boolean system = dependency.getSystemPath() != null
                && !dependency.getSystemPath().isEmpty();

        Map<String, String> props = null;
        if (system) {
            props = Collections.singletonMap(MavenArtifactProperties.LOCAL_PATH, dependency.getSystemPath());
        }

        Artifact artifact = new DefaultArtifact(
                dependency.getGroupId(),
                dependency.getArtifactId(),
                dependency.getClassifier(),
                null,
                dependency.getVersion(),
                props,
                stereotype);

        List<Exclusion> exclusions = new ArrayList<>(dependency.getExclusions().size());
        for (org.apache.maven.api.model.Exclusion exclusion : dependency.getExclusions()) {
            exclusions.add(convert(exclusion));
        }

        return new Dependency(
                artifact,
                dependency.getScope(),
                dependency.getOptional() != null ? dependency.isOptional() : null,
                exclusions);
    }

    private Exclusion convert(org.apache.maven.api.model.Exclusion exclusion) {
        return new Exclusion(exclusion.getGroupId(), exclusion.getArtifactId(), "*", "*");
    }

    private static boolean hasUninterpolatedExpression(org.apache.maven.api.model.Dependency dependency) {
        return containsPlaceholder(dependency.getGroupId())
                || containsPlaceholder(dependency.getArtifactId())
                || containsPlaceholder(dependency.getVersion());
    }

    private static boolean containsPlaceholder(String value) {
        return value != null && value.contains("${");
    }

    private void setArtifactProperties(ArtifactDescriptorResult result, Model model) {
        String downloadUrl = null;
        DistributionManagement distMgmt = model.getDistributionManagement();
        if (distMgmt != null) {
            downloadUrl = distMgmt.getDownloadUrl();
        }
        if (downloadUrl != null && !downloadUrl.isEmpty()) {
            Artifact artifact = result.getArtifact();
            Map<String, String> props = new HashMap<>(artifact.getProperties());
            props.put(ArtifactProperties.DOWNLOAD_URL, downloadUrl);
            result.setArtifact(artifact.setProperties(props));
        }
    }
}
