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/*
 * 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.collection;

import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;

import org.eclipse.aether.RepositoryException;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.graph.DependencyNode;
import org.eclipse.aether.version.VersionConstraint;

/**
 * Thrown in case of an unsolvable conflict between different version constraints for a dependency.
 */
public class UnsolvableVersionConflictException extends RepositoryException {

    private final transient Collection versions;

    private final transient Collection> paths;

    /**
     * Creates a new exception with the specified paths to conflicting nodes in the dependency graph.
     *
     * @param paths The paths to the dependency nodes that participate in the version conflict, may be {@code null}.
     */
    public UnsolvableVersionConflictException(Collection> paths) {
        super("Could not resolve version conflict among " + toPaths(paths));
        if (paths == null) {
            this.paths = Collections.emptyList();
            this.versions = Collections.emptyList();
        } else {
            this.paths = paths;
            this.versions = new LinkedHashSet<>();
            for (List path : paths) {
                VersionConstraint constraint = path.get(path.size() - 1).getVersionConstraint();
                if (constraint != null && constraint.getRange() != null) {
                    versions.add(constraint.toString());
                }
            }
        }
    }

    private static String toPaths(Collection> paths) {
        String result = "";

        if (paths != null) {
            Collection strings = new LinkedHashSet<>();

            for (List path : paths) {
                strings.add(toPath(path));
            }

            result = strings.toString();
        }

        return result;
    }

    private static String toPath(List path) {
        StringBuilder buffer = new StringBuilder(256);

        for (Iterator it = path.iterator(); it.hasNext(); ) {
            DependencyNode node = it.next();
            if (node.getDependency() == null) {
                continue;
            }

            Artifact artifact = node.getDependency().getArtifact();
            buffer.append(artifact.getGroupId());
            buffer.append(':').append(artifact.getArtifactId());
            buffer.append(':').append(artifact.getExtension());
            if (artifact.getClassifier().length() > 0) {
                buffer.append(':').append(artifact.getClassifier());
            }
            buffer.append(':').append(node.getVersionConstraint());

            if (it.hasNext()) {
                buffer.append(" -> ");
            }
        }

        return buffer.toString();
    }

    /**
     * Gets the paths leading to the conflicting dependencies.
     *
     * @return The (read-only) paths leading to the conflicting dependencies, never {@code null}.
     */
    public Collection> getPaths() {
        return paths;
    }

    /**
     * Gets the conflicting version constraints of the dependency.
     *
     * @return The (read-only) conflicting version constraints, never {@code null}.
     */
    public Collection getVersions() {
        return versions;
    }
}