/*
 * 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.metadata;

import org.apache.maven.artifact.ArtifactScopeEnum;

/**
 * metadata graph vertice - just a wrapper around artifact's metadata
 *
 * @author <a href="oleg@codehaus.org">Oleg Gusakov</a>
 */
public class MetadataGraphVertex implements Comparable<MetadataGraphVertex> {
    ArtifactMetadata md;

    // indications to use these in comparison
    private boolean compareVersion = false;
    private boolean compareScope = false;

    public MetadataGraphVertex(ArtifactMetadata md) {
        super();
        this.md = md;
    }

    public MetadataGraphVertex(ArtifactMetadata md, boolean compareVersion, boolean compareScope) {
        this(md);
        this.compareVersion = compareVersion;
        this.compareScope = compareScope;
    }

    public ArtifactMetadata getMd() {
        return md;
    }

    public void setMd(ArtifactMetadata md) {
        this.md = md;
    }

    // ---------------------------------------------------------------------
    public boolean isCompareVersion() {
        return compareVersion;
    }

    public void setCompareVersion(boolean compareVersion) {
        this.compareVersion = compareVersion;
    }

    public boolean isCompareScope() {
        return compareScope;
    }

    public void setCompareScope(boolean compareScope) {
        this.compareScope = compareScope;
    }

    // ---------------------------------------------------------------------
    @Override
    public String toString() {
        return "[" + (md == null ? "no metadata" : md.toString()) + "]";
    }

    // ---------------------------------------------------------------------
    private static int compareStrings(String s1, String s2) {
        if (s1 == null && s2 == null) {
            return 0;
        }

        if (s1 == null /* && s2 != null */) {
            return -1;
        }

        if (
        /* s1 != null && */ s2 == null) {
            return 1;
        }

        return s1.compareTo(s2);
    }

    // ---------------------------------------------------------------------
    public int compareTo(MetadataGraphVertex vertex) {
        if (vertex == null || vertex.getMd() == null) {
            return 1;
        }

        ArtifactMetadata vmd = vertex.getMd();

        if (vmd == null) {
            if (md == null) {
                return 0;
            } else {
                return 1;
            }
        }

        int g = compareStrings(md.groupId, vmd.groupId);

        if (g == 0) {
            int a = compareStrings(md.artifactId, vmd.artifactId);
            if (a == 0) {
                if (compareVersion) {
                    int v = compareStrings(md.version, vmd.version);
                    if (v == 0) {
                        if (compareScope) {
                            String s1 = ArtifactScopeEnum.checkScope(md.artifactScope)
                                    .getScope();
                            String s2 = ArtifactScopeEnum.checkScope(vmd.artifactScope)
                                    .getScope();
                            return s1.compareTo(s2);
                        } else {
                            return 0;
                        }
                    } else {
                        return v;
                    }
                } else {
                    return 0;
                }
            } else {
                return a;
            }
        }

        return g;
    }

    // ---------------------------------------------------------------------
    @Override
    public boolean equals(Object vo) {
        if (vo == null || !(vo instanceof MetadataGraphVertex)) {
            return false;
        }
        return compareTo((MetadataGraphVertex) vo) == 0;
    }

    // ---------------------------------------------------------------------

    @Override
    public int hashCode() {
        if (md == null) {
            return super.hashCode();
        }
        StringBuilder hashString = new StringBuilder(128);
        hashString.append(md.groupId).append('|');
        hashString.append(md.artifactId).append('|');

        if (compareVersion) {
            hashString.append(md.version).append('|');
        }

        if (compareScope) {
            hashString.append(md.getArtifactScope()).append('|');
        }

        return hashString.toString().hashCode();

        // BASE64Encoder b64 = new BASE64Encoder();
        // return b64.encode( hashString.toString().getBytes() ).hashCode();
    }

    // ---------------------------------------------------------------------
    // ---------------------------------------------------------------------
}
