/*
 * Created on Jan 26, 2006
 */
package net.sourceforge.fenixedu.domain.degreeStructure;

import java.util.Iterator;

import net.sourceforge.fenixedu.domain.degreeStructure.BibliographicReferences.BibliographicReference;
import net.sourceforge.fenixedu.domain.degreeStructure.BibliographicReferences.BibliographicReferenceType;

import org.apache.commons.lang.StringUtils;

public class Externalization {

    public static String externalizeBibliographicReferences(BibliographicReferences source) {
	return write(source);
    }

    public static BibliographicReferences internalizeBibliographicReferences(String source) {
	if ((source != null) && (source.length() > 0)) {
	    return read(source);
	} else {
            return new BibliographicReferences();
        }
    }

    private static final String NEW_LINE = "\r\n";
    private static final String ELEMENT_SEPARATOR = "||";

    private static String write(final BibliographicReferences bibliographicReferences) {
	final StringBuilder stringBuilder = new StringBuilder();
	final Iterator<BibliographicReference> references = bibliographicReferences.getBibliographicReferencesList().iterator();
	while (references.hasNext()) {
	    write(stringBuilder, references.next());
	    if (references.hasNext()) {
		stringBuilder.append(NEW_LINE);
	    }
	}
	return stringBuilder.toString();
    }

    private static void write(final StringBuilder stringBuilder, final BibliographicReference reference) {
	stringBuilder.append(reference.getYear()).append(ELEMENT_SEPARATOR);
	stringBuilder.append(reference.getTitle()).append(ELEMENT_SEPARATOR);
	stringBuilder.append(reference.getAuthors()).append(ELEMENT_SEPARATOR);
	stringBuilder.append(reference.getReference()).append(ELEMENT_SEPARATOR);
	stringBuilder.append(StringUtils.isEmpty(reference.getUrl()) ? "" : reference.getUrl()).append(ELEMENT_SEPARATOR);
	stringBuilder.append(reference.getType()).append(ELEMENT_SEPARATOR);
	stringBuilder.append(reference.getOrder());
    }

    private static BibliographicReferences read(String source) {
	final BibliographicReferences bibliographicReferences = new BibliographicReferences();
	fillBibliographicReferences(bibliographicReferences, source);
	return bibliographicReferences;
    }

    private static void fillBibliographicReferences(final BibliographicReferences bibliographicReferences, final String source) {
	final int indexOfSep1 = source.indexOf(ELEMENT_SEPARATOR);
	final int indexOfSep2 = source.indexOf(ELEMENT_SEPARATOR, indexOfSep1 + ELEMENT_SEPARATOR.length());
	final int indexOfSep3 = source.indexOf(ELEMENT_SEPARATOR, indexOfSep2 + ELEMENT_SEPARATOR.length());
	final int indexOfSep4 = source.indexOf(ELEMENT_SEPARATOR, indexOfSep3 + ELEMENT_SEPARATOR.length());
	final int indexOfSep5 = source.indexOf(ELEMENT_SEPARATOR, indexOfSep4 + ELEMENT_SEPARATOR.length());
	final int indexOfSep6 = source.indexOf(ELEMENT_SEPARATOR, indexOfSep5 + ELEMENT_SEPARATOR.length());
	final int temp = source.indexOf(NEW_LINE, indexOfSep6 + ELEMENT_SEPARATOR.length());
	final int indexOfSep7 = temp < 0 ? source.length() : temp;

	bibliographicReferences.createBibliographicReference(source.substring(0, indexOfSep1), source.substring(indexOfSep1
		+ ELEMENT_SEPARATOR.length(), indexOfSep2), source.substring(indexOfSep2 + ELEMENT_SEPARATOR.length(),
		indexOfSep3), source.substring(indexOfSep3 + ELEMENT_SEPARATOR.length(), indexOfSep4), source.substring(
		indexOfSep4 + ELEMENT_SEPARATOR.length(), indexOfSep5),source.substring(indexOfSep5
		+ ELEMENT_SEPARATOR.length(), indexOfSep6).equals("null") ? BibliographicReferenceType.MAIN : BibliographicReferenceType
		.valueOf(source.substring(indexOfSep5 + ELEMENT_SEPARATOR.length(), indexOfSep6)), Integer.valueOf(source
		.substring(indexOfSep6 + ELEMENT_SEPARATOR.length(), indexOfSep7)));

	if (indexOfSep7 + NEW_LINE.length() < source.length()) {
	    fillBibliographicReferences(bibliographicReferences, source.substring(indexOfSep7 + NEW_LINE.length()));
	}
    }

}