/*
 * 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.plugins.changes;

import java.io.File;
import java.io.FileInputStream;
import java.util.Collections;
import java.util.List;

import org.apache.maven.plugin.logging.Log;
import org.apache.maven.plugins.changes.model.Body;
import org.apache.maven.plugins.changes.model.ChangesDocument;
import org.apache.maven.plugins.changes.model.Properties;
import org.apache.maven.plugins.changes.model.Release;
import org.apache.maven.plugins.changes.model.io.xpp3.ChangesXpp3Reader;

/**
 * A facade for a changes.xml file.
 *
 * @version $Id$
 */
public class ChangesXML {

    /** The list of releases in the changes.xml file. */
    private List<Release> releaseList;

    /** The author in the changes.xml file. */
    private String author;

    /** The title of the changes.xml file. */
    private String title;

    /** The e-mail address of the author in the changes.xml file. */
    private String authorEmail;

    /** The changes.xml document. */
    private ChangesDocument changesDocument;

    /**
     * Constructor that sets the changes.xml file and the logger.
     *
     * @param xmlPath the changes.xml file
     * @param log the logger
     * @throws ChangesXMLRuntimeException if there was a fatal error while parsing the changes.xml file
     */
    public ChangesXML(File xmlPath, Log log) throws ChangesXMLRuntimeException {

        if (xmlPath == null || !xmlPath.exists()) {
            log.error("changes xml file is null or not exists ");
            return;
        }

        try {

            ChangesXpp3Reader reader = new ChangesXpp3Reader();

            try (FileInputStream fileInputStream = new FileInputStream(xmlPath)) {
                changesDocument = reader.read(fileInputStream, false);
            }

            if (changesDocument == null) {
                log.error("Cannot build Changes Report from file: " + xmlPath.getPath());
                return;
            }

            Properties properties = changesDocument.getProperties();

            if (properties != null) {
                if (properties.getAuthor() != null) {
                    this.author = properties.getAuthor().getName();
                    this.authorEmail = properties.getAuthor().getName();
                }
                this.title = properties.getTitle();
            }

            Body body = changesDocument.getBody();

            if (body != null) {
                this.releaseList = body.getReleases();
            }

        } catch (Throwable e) {
            log.error("An error occurred when parsing the changes.xml file: ", e);
            throw new ChangesXMLRuntimeException("An error occurred when parsing the changes.xml file", e);
        }
    }

    /**
     * Sets the {@link ChangesXML#author} attribute.
     *
     * @param author the new value of the {@link ChangesXML#author} attribute
     */
    public void setAuthor(String author) {
        this.author = author;
    }

    /**
     * Returns the current value of the author attribute.
     *
     * @return the current value of the author attribute
     */
    public String getAuthor() {
        return author;
    }

    /**
     * Sets the {@link ChangesXML#releaseList} attribute.
     *
     * @param releaseList the new value of the {@link ChangesXML#releaseList} attribute
     */
    public void setReleaseList(List<Release> releaseList) {
        this.releaseList = releaseList;
    }

    /**
     * Returns the current value of the {@link ChangesXML#releaseList} attribute.
     *
     * @return the current value of the {@link ChangesXML#releaseList} attribute
     */
    public List<Release> getReleaseList() {
        return releaseList == null ? Collections.<Release>emptyList() : releaseList;
    }

    /**
     * Sets the {@link ChangesXML#title} attribute.
     *
     * @param title the new value of the {@link ChangesXML#title} attribute
     */
    public void setTitle(String title) {
        this.title = title;
    }

    /**
     * Returns the current value of the {@link ChangesXML#title} attribute.
     *
     * @return the current value of the {@link ChangesXML#title} attribute
     */
    public String getTitle() {
        return title;
    }

    /**
     * Returns the current value of the {@link ChangesXML#changesDocument} attribute.
     *
     * @return the current value of the {@link ChangesXML#changesDocument} attribute
     */
    public ChangesDocument getChangesDocument() {
        return changesDocument;
    }

    /**
     * Returns the current value of the {@link ChangesXML#authorEmail} attribute.
     *
     * @return the current value of the {@link ChangesXML#authorEmail} attribute
     */
    public String getAuthorEmail() {
        return authorEmail;
    }

    /**
     * Sets the {@link ChangesXML#authorEmail} attribute.
     *
     * @param authorEmail the new value of the {@link ChangesXML#authorEmail} attribute
     */
    public void setAuthorEmail(String authorEmail) {
        this.authorEmail = authorEmail;
    }
}