/*
 * DSS - Digital Signature Services
 *
 * Copyright (C) 2013 European Commission, Directorate-General Internal Market and Services (DG MARKT), B-1049 Bruxelles/Brussel
 *
 * Developed by: 2013 ARHS Developments S.A. (rue Nicolas Bové 2B, L-1253 Luxembourg) http://www.arhs-developments.com
 *
 * This file is part of the "DSS - Digital Signature Services" project.
 *
 * "DSS - Digital Signature Services" is free software: you can redistribute it and/or modify it under the terms of
 * the GNU Lesser General Public License as published by the Free Software Foundation, either version 2.1 of the
 * License, or (at your option) any later version.
 *
 * DSS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * "DSS - Digital Signature Services".  If not, see <http://www.gnu.org/licenses/>.
 */

package eu.europa.ec.markt.dss.signature.pdf.pdfbox;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
import java.util.Set;

import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSString;
import org.apache.pdfbox.pdmodel.PDDocument;

import eu.europa.ec.markt.dss.signature.pdf.PdfArray;
import eu.europa.ec.markt.dss.signature.pdf.PdfDict;

class PdfBoxDict implements PdfDict {

	COSDictionary wrapped;

    // Retain this reference ! PDDocument must not be garbage collected
    @SuppressWarnings("unused")
	private PDDocument document;

	public PdfBoxDict(COSDictionary wrapped, PDDocument document) {
		this.wrapped = wrapped;
		this.document = document;
	}

	public PdfBoxDict(String type) {
		wrapped = new COSDictionary();
		if (type != null) {
			wrapped.setItem("Type", COSName.getPDFName(type));
		}
	}

	@Override
	public PdfDict getAsDict(String name) {
		COSDictionary dict = (COSDictionary) wrapped.getDictionaryObject(name);
		if(dict == null) {
			return null;
		}
		return new PdfBoxDict(dict, document);
	}

	@Override
	public PdfArray getAsArray(String name) {
		COSArray array = (COSArray) wrapped.getDictionaryObject(name);
		if(array == null) {
			return null;
		}
		return new PdfBoxArray(array, document);
	}

	@Override
    public boolean hasAName(String name) {
        COSBase dictionaryObject = wrapped.getDictionaryObject(name);
        if (dictionaryObject == null) {
            return false;
        }
        return true;
    }

    @Override
    public boolean hasANameWithValue(String name, String value) {
		COSName pdfName = (COSName) wrapped.getDictionaryObject(name);
		if (pdfName == null) {
			return false;
		}
		return pdfName.getName().equals(value);
	}

	@Override
	public byte[] get(String name) throws IOException {
		COSBase val = wrapped.getDictionaryObject(name);
		if (val == null) {
			return null;
		}
		if(val instanceof COSString) {
			return ((COSString)val).getBytes();
		}
        if(val instanceof COSName) {
			return ((COSName)val).getName().getBytes();
		}
		throw new IOException(name + " was expected to be a COSString element but was " + val.getClass() + " : " + val);
	}

    @Override
	public String[] list() throws IOException {
        final Set<COSName> cosNames = wrapped.keySet();
        List<String> result = new ArrayList<String>(cosNames.size());
        for (final COSName cosName : cosNames) {
            final String name = cosName.getName();
            result.add(name);
        }
        return result.toArray(new String[result.size()]);
	}

	@Override
	public String toString() {
		return wrapped.toString();
	}

    @Override
    public void add(String key, PdfArray array) throws IOException {
        PdfBoxArray a = (PdfBoxArray) array;
        wrapped.setItem(key, a.wrapped);
        wrapped.setNeedToBeUpdate(true);
    }

    @Override
    public void add(String key, PdfDict dict) throws IOException {
        PdfBoxDict d = (PdfBoxDict) dict;
        wrapped.setItem(key, d.wrapped);
        wrapped.setNeedToBeUpdate(true);
    }

    @Override
    public void add(String key, Calendar cal) throws IOException {
        wrapped.setDate(key, cal);
        wrapped.setNeedToBeUpdate(true);
    }

    COSDictionary getWrapped() {
        return wrapped;
    }

}