/*
 * Copyright 2012-2022 the original author or authors.
 *
 * Licensed 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
 *
 *      https://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.dubbo.maven.plugin.aot;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugins.annotations.Parameter;
import org.apache.maven.project.MavenProject;
import org.apache.maven.shared.artifact.filter.collection.AbstractArtifactFeatureFilter;
import org.apache.maven.shared.artifact.filter.collection.ArtifactFilterException;
import org.apache.maven.shared.artifact.filter.collection.ArtifactsFilter;
import org.apache.maven.shared.artifact.filter.collection.FilterArtifacts;

import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.StringTokenizer;

/**
 * A base mojo filtering the dependencies of the project.
 *
 * @author Stephane Nicoll
 * @author David Turanski
 */
public abstract class AbstractDependencyFilterMojo extends AbstractMojo {

    /**
     * The Maven project.
     */
    @Parameter(defaultValue = "${project}", readonly = true, required = true)
    protected MavenProject project;

    /**
     * Collection of artifact definitions to include. The {@link Include} element defines
     * mandatory {@code groupId} and {@code artifactId} properties and an optional
     * mandatory {@code groupId} and {@code artifactId} properties and an optional
     * {@code classifier} property.
     */
    @Parameter(property = "dubbo.includes")
    private List<Include> includes;

    /**
     * Collection of artifact definitions to exclude. The {@link Exclude} element defines
     * mandatory {@code groupId} and {@code artifactId} properties and an optional
     * {@code classifier} property.
     */
    @Parameter(property = "dubbo.excludes")
    private List<Exclude> excludes;

    /**
     * Comma separated list of groupId names to exclude (exact match).
     */
    @Parameter(property = "dubbo.excludeGroupIds", defaultValue = "")
    private String excludeGroupIds;

    protected void setExcludes(List<Exclude> excludes) {
        this.excludes = excludes;
    }

    protected void setIncludes(List<Include> includes) {
        this.includes = includes;
    }

    protected void setExcludeGroupIds(String excludeGroupIds) {
        this.excludeGroupIds = excludeGroupIds;
    }

    protected List<URL> getDependencyURLs(ArtifactsFilter... additionalFilters) throws MojoExecutionException {
        Set<Artifact> artifacts = filterDependencies(this.project.getArtifacts(), additionalFilters);
        List<URL> urls = new ArrayList<>();
        for (Artifact artifact : artifacts) {
            if (artifact.getFile() != null) {
                urls.add(toURL(artifact.getFile()));
            }
        }
        return urls;
    }

    protected final Set<Artifact> filterDependencies(Set<Artifact> dependencies, ArtifactsFilter... additionalFilters)
        throws MojoExecutionException {
        try {
            Set<Artifact> filtered = new LinkedHashSet<>(dependencies);
            filtered.retainAll(getFilters(additionalFilters).filter(dependencies));
            return filtered;
        }
        catch (ArtifactFilterException ex) {
            throw new MojoExecutionException(ex.getMessage(), ex);
        }
    }

    protected URL toURL(File file) {
        try {
            return file.toURI().toURL();
        }
        catch (MalformedURLException ex) {
            throw new IllegalStateException("Invalid URL for " + file, ex);
        }
    }

    /**
     * Return artifact filters configured for this MOJO.
     * @param additionalFilters optional additional filters to apply
     * @return the filters
     */
    private FilterArtifacts getFilters(ArtifactsFilter... additionalFilters) {
        FilterArtifacts filters = new FilterArtifacts();
        for (ArtifactsFilter additionalFilter : additionalFilters) {
            filters.addFilter(additionalFilter);
        }
        filters.addFilter(new MatchingGroupIdFilter(cleanFilterConfig(this.excludeGroupIds)));
        if (this.includes != null && !this.includes.isEmpty()) {
            filters.addFilter(new IncludeFilter(this.includes));
        }
        if (this.excludes != null && !this.excludes.isEmpty()) {
            filters.addFilter(new ExcludeFilter(this.excludes));
        }
        return filters;
    }

    private String cleanFilterConfig(String content) {
        if (content == null || content.trim().isEmpty()) {
            return "";
        }
        StringBuilder cleaned = new StringBuilder();
        StringTokenizer tokenizer = new StringTokenizer(content, ",");
        while (tokenizer.hasMoreElements()) {
            cleaned.append(tokenizer.nextToken().trim());
            if (tokenizer.hasMoreElements()) {
                cleaned.append(",");
            }
        }
        return cleaned.toString();
    }

    /**
     * {@link ArtifactFilter} to exclude test scope dependencies.
     */
    protected static class ExcludeTestScopeArtifactFilter extends AbstractArtifactFeatureFilter {

        ExcludeTestScopeArtifactFilter() {
            super("", Artifact.SCOPE_TEST);
        }

        @Override
        protected String getArtifactFeature(Artifact artifact) {
            return artifact.getScope();
        }

    }

}