/*
 * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.controller.netconf.cli.reader.impl;

import static org.opendaylight.controller.netconf.cli.io.IOUtil.isSkipInput;
import static org.opendaylight.controller.netconf.cli.io.IOUtil.listType;

import com.google.common.base.Optional;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.opendaylight.controller.netconf.cli.io.BaseConsoleContext;
import org.opendaylight.controller.netconf.cli.io.ConsoleContext;
import org.opendaylight.controller.netconf.cli.io.ConsoleIO;
import org.opendaylight.controller.netconf.cli.reader.AbstractReader;
import org.opendaylight.controller.netconf.cli.reader.ReadingException;
import org.opendaylight.controller.netconf.util.xml.XmlUtil;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
import org.opendaylight.yangtools.yang.data.impl.schema.builder.impl.ImmutableContainerNodeBuilder;
import org.opendaylight.yangtools.yang.data.impl.schema.builder.impl.ImmutableLeafNodeBuilder;
import org.opendaylight.yangtools.yang.data.impl.schema.transform.dom.DomUtils;
import org.opendaylight.yangtools.yang.data.impl.schema.transform.dom.parser.DomToNormalizedNodeParserFactory;
import org.opendaylight.yangtools.yang.model.api.AnyXmlSchemaNode;
import org.opendaylight.yangtools.yang.model.api.SchemaContext;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;

public class AnyXmlReader extends AbstractReader<AnyXmlSchemaNode> {

    public AnyXmlReader(final ConsoleIO console, final SchemaContext schemaContext) {
        super(console, schemaContext);
    }

    public AnyXmlReader(final ConsoleIO console, final SchemaContext schemaContext, final boolean readConfigNode) {
        super(console, schemaContext, readConfigNode);
    }

    @Override
    protected List<NormalizedNode<?, ?>> readWithContext(final AnyXmlSchemaNode schemaNode) throws IOException, ReadingException {
        console.writeLn(listType(schemaNode) + " " + schemaNode.getQName().getLocalName());

        final String rawValue = console.read();

        DataContainerChild<?, ?> newNode = null;
        if (!isSkipInput(rawValue)) {
            final Optional<DataContainerChild<?, ?>> value = tryParse(rawValue, schemaNode);

            if (value.isPresent()) {
                newNode = ImmutableContainerNodeBuilder.create()
                        .withNodeIdentifier(new NodeIdentifier(schemaNode.getQName()))
                        .withChild(value.get()).build();
            } else {
                newNode = ImmutableLeafNodeBuilder.create().withNodeIdentifier(new NodeIdentifier(schemaNode.getQName())).withValue(rawValue).build();
            }
        }

        final List<NormalizedNode<?, ?>> newNodes = new ArrayList<>();
        newNodes.add(newNode);
        return newNodes;
    }

    private Optional<DataContainerChild<?, ?>> tryParse(final String rawValue, final AnyXmlSchemaNode schemaNode) {
        try {
            final Document dom = XmlUtil.readXmlToDocument(rawValue);
            return Optional.<DataContainerChild<?, ?>> of(
                    DomToNormalizedNodeParserFactory.
                            getInstance(DomUtils.defaultValueCodecProvider(), getSchemaContext()).
                            getAnyXmlNodeParser().
                            parse(Collections.singletonList(dom.getDocumentElement()), schemaNode)
            );
        } catch (SAXException | IOException e) {
            // TODO log
            return Optional.absent();
        }
    }

    @Override
    protected ConsoleContext getContext(final AnyXmlSchemaNode schemaNode) {
        return new BaseConsoleContext<>(schemaNode);
    }
}