/*
 * 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.model.io;

import javax.inject.Named;
import javax.inject.Singleton;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.util.Map;
import java.util.Objects;

import org.apache.maven.model.InputSource;
import org.apache.maven.model.Model;
import org.apache.maven.model.io.xpp3.MavenXpp3Reader;
import org.apache.maven.model.io.xpp3.MavenXpp3ReaderEx;
import org.codehaus.plexus.util.ReaderFactory;
import org.codehaus.plexus.util.xml.XmlStreamReader;
import org.codehaus.plexus.util.xml.pull.XmlPullParserException;

/**
 * Handles deserialization of a model from some kind of textual format like XML.
 *
 * @author Benjamin Bentmann
 */
@Named
@Singleton
public class DefaultModelReader implements ModelReader {

    @Override
    public Model read(File input, Map<String, ?> options) throws IOException {
        Objects.requireNonNull(input, "input cannot be null");

        Model model = read(new FileInputStream(input), options);

        model.setPomFile(input);

        return model;
    }

    @Override
    public Model read(Reader input, Map<String, ?> options) throws IOException {
        Objects.requireNonNull(input, "input cannot be null");

        try (Reader in = input) {
            return read(in, isStrict(options), getSource(options));
        }
    }

    @Override
    public Model read(InputStream input, Map<String, ?> options) throws IOException {
        Objects.requireNonNull(input, "input cannot be null");

        try (XmlStreamReader in = ReaderFactory.newXmlReader(input)) {
            return read(in, isStrict(options), getSource(options));
        }
    }

    private boolean isStrict(Map<String, ?> options) {
        Object value = (options != null) ? options.get(IS_STRICT) : null;
        return value == null || Boolean.parseBoolean(value.toString());
    }

    private InputSource getSource(Map<String, ?> options) {
        Object value = (options != null) ? options.get(INPUT_SOURCE) : null;
        return (InputSource) value;
    }

    private Model read(Reader reader, boolean strict, InputSource source) throws IOException {
        try {
            if (source != null) {
                return new MavenXpp3ReaderEx().read(reader, strict, source);
            } else {
                return new MavenXpp3Reader().read(reader, strict);
            }
        } catch (XmlPullParserException e) {
            throw new ModelParseException(e.getMessage(), e.getLineNumber(), e.getColumnNumber(), e);
        }
    }
}
