/*
* 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.poi.hslf.record;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;

import org.apache.poi.util.LittleEndian;

import static org.apache.logging.log4j.util.Unbox.box;

/**
 * This class represents the data of a link in the document.
 */
public class ExHyperlink extends RecordContainer {
    private static final long _type = RecordTypes.ExHyperlink.typeID;

    private byte[] _header;

    // Links to our more interesting children
    private ExHyperlinkAtom linkAtom;
    private CString linkDetailsA;
    private CString linkDetailsB;

    /**
     * Returns the ExHyperlinkAtom of this link
     */
    public ExHyperlinkAtom getExHyperlinkAtom() { return linkAtom; }

    /**
     * Returns the URL of the link.
     *
     * @return the URL of the link
     */
    public String getLinkURL() {
        return linkDetailsB == null ? null : linkDetailsB.getText();
    }

    /**
     * Returns the hyperlink's user-readable name
     *
     * @return the hyperlink's user-readable name
     */
    public String getLinkTitle() {
        return linkDetailsA == null ? null : linkDetailsA.getText();
    }

    /**
     * Sets the URL of the link
     * TODO: Figure out if we should always set both
     */
    public void setLinkURL(String url) {
        if(linkDetailsB != null) {
            linkDetailsB.setText(url);
        }
    }

    public void setLinkOptions(int options) {
        if(linkDetailsB != null) {
            linkDetailsB.setOptions(options);
        }
    }

    public void setLinkTitle(String title) {
        if(linkDetailsA != null) {
            linkDetailsA.setText(title);
        }
    }

    /**
     * Get the link details (field A)
     */
    public String _getDetailsA() {
        return linkDetailsA == null ? null : linkDetailsA.getText();
    }
    /**
     * Get the link details (field B)
     */
    public String _getDetailsB() {
        return linkDetailsB == null ? null : linkDetailsB.getText();
    }

    /**
     * Set things up, and find our more interesting children
     */
    protected ExHyperlink(byte[] source, int start, int len) {
        // Grab the header
        _header = Arrays.copyOfRange(source, start, start+8);

        // Find our children
        _children = Record.findChildRecords(source,start+8,len-8);
        findInterestingChildren();
    }

    /**
     * Go through our child records, picking out the ones that are
     *  interesting, and saving those for use by the easy helper
     *  methods.
     */
    private void findInterestingChildren() {

        // First child should be the ExHyperlinkAtom
        Record child = _children[0];
        if(child instanceof ExHyperlinkAtom) {
            linkAtom = (ExHyperlinkAtom) child;
        } else {
            LOG.atError().log("First child record wasn't a ExHyperlinkAtom, was of type {}", box(child.getRecordType()));
        }

        for (int i = 1; i < _children.length; i++) {
            child = _children[i];
            if (child instanceof CString){
                if ( linkDetailsA == null) linkDetailsA = (CString) child;
                else linkDetailsB = (CString) child;
            } else {
                LOG.atError().log("Record after ExHyperlinkAtom wasn't a CString, was of type {}", box(child.getRecordType()));
            }

        }
    }

    /**
     * Create a new ExHyperlink, with blank fields
     */
    public ExHyperlink() {
        _header = new byte[8];
        _children = new org.apache.poi.hslf.record.Record[3];

        // Setup our header block
        _header[0] = 0x0f; // We are a container record
        LittleEndian.putShort(_header, 2, (short)_type);

        // Setup our child records
        CString csa = new CString();
        CString csb = new CString();
        csa.setOptions(0x00);
        csb.setOptions(0x10);
        _children[0] = new ExHyperlinkAtom();
        _children[1] = csa;
        _children[2] = csb;
        findInterestingChildren();
    }

    /**
     * We are of type 4055
     */
    public long getRecordType() { return _type; }

    /**
     * Write the contents of the record back, so it can be written
     *  to disk
     */
    public void writeOut(OutputStream out) throws IOException {
        writeOut(_header[0],_header[1],_type,_children,out);
    }
}