/**
 * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
 */

package net.sourceforge.pmd.cpd;

import java.util.Iterator;

import net.sourceforge.pmd.PMD;
import net.sourceforge.pmd.util.StringUtil;

public class SimpleRenderer implements Renderer {

    private String separator;
    private boolean trimLeadingWhitespace;

    public static final String DEFAULT_SEPARATOR = "=====================================================================";

    public SimpleRenderer() {
        this(false);
    }

    public SimpleRenderer(boolean trimLeadingWhitespace) {
        this(DEFAULT_SEPARATOR);
        this.trimLeadingWhitespace = trimLeadingWhitespace;
    }

    public SimpleRenderer(String theSeparator) {
        separator = theSeparator;
    }

    private void renderOn(StringBuilder rpt, Match match) {

        rpt.append("Found a ").append(match.getLineCount()).append(" line (").append(match.getTokenCount())
                .append(" tokens) duplication in the following files: ").append(PMD.EOL);

        for (Iterator<Mark> occurrences = match.iterator(); occurrences.hasNext();) {
            Mark mark = occurrences.next();
            rpt.append("Starting at line ").append(mark.getBeginLine()).append(" of ").append(mark.getFilename())
                    .append(PMD.EOL);
        }

        rpt.append(PMD.EOL); // add a line to separate the source from the desc
        // above

        String source = match.getSourceCodeSlice();

        if (trimLeadingWhitespace) {
            String[] lines = source.split("[" + PMD.EOL + "]");
            int trimDepth = StringUtil.maxCommonLeadingWhitespaceForAll(lines);
            if (trimDepth > 0) {
                lines = StringUtil.trimStartOn(lines, trimDepth);
            }
            for (int i = 0; i < lines.length; i++) {
                rpt.append(lines[i]).append(PMD.EOL);
            }
            return;
        }

        rpt.append(source).append(PMD.EOL);
    }

    @Override
    public String render(Iterator<Match> matches) {

        StringBuilder rpt = new StringBuilder(300);

        if (matches.hasNext()) {
            renderOn(rpt, matches.next());
        }

        Match match;
        while (matches.hasNext()) {
            match = matches.next();
            rpt.append(separator).append(PMD.EOL);
            renderOn(rpt, match);

        }
        return rpt.toString();
    }
}