package hudson.cli;

import hudson.Extension;
import hudson.model.AbstractBuild;
import hudson.scm.ChangeLogSet;
import hudson.scm.ChangeLogSet.Entry;
import hudson.util.QuotedStringTokenizer;
import org.kohsuke.args4j.Option;
import org.kohsuke.stapler.export.Flavor;
import org.kohsuke.stapler.export.Model;
import org.kohsuke.stapler.export.ModelBuilder;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

/**
 * Retrieves a change list for the specified builds.
 *
 * @author Kohsuke Kawaguchi
 */
@Extension
public class ListChangesCommand extends AbstractBuildRangeCommand {
    @Override
    public String getShortDescription() {
        return "Dumps the changelog for the specified build(s)";
    }

//    @Override
//    protected void printUsageSummary(PrintStream stderr) {
//        TODO
//    }

    enum Format {
        XML, CSV, PLAIN
    }

    @Option(name="-format",usage="Controls how the output from this command is printed.")
    public Format format = Format.PLAIN;

    @Override
    protected int act(List<AbstractBuild<?, ?>> builds) throws IOException {
        // Loading job for this CLI command requires Item.READ permission.
        // No other permission check needed.
        switch (format) {
        case XML:
            PrintWriter w = new PrintWriter(stdout);
            w.println("<changes>");
            for (AbstractBuild build : builds) {
                w.println("<build number='"+build.getNumber()+"'>");
                ChangeLogSet<?> cs = build.getChangeSet();
                Model p = new ModelBuilder().get(cs.getClass());
                p.writeTo(cs,Flavor.XML.createDataWriter(cs,w));
                w.println("</build>");
            }
            w.println("</changes>");
            w.flush();
            break;
        case CSV:
            for (AbstractBuild build : builds) {
                ChangeLogSet<?> cs = build.getChangeSet();
                for (Entry e : cs) {
                    stdout.printf("%s,%s\n",
                            QuotedStringTokenizer.quote(e.getAuthor().getId()),
                            QuotedStringTokenizer.quote(e.getMsg()));
                }
            }
            break;
        case PLAIN:
            for (AbstractBuild build : builds) {
                ChangeLogSet<?> cs = build.getChangeSet();
                for (Entry e : cs) {
                    stdout.printf("%s\t%s\n",e.getAuthor(),e.getMsg());
                    for (String p : e.getAffectedPaths())
                        stdout.println("  "+p);
                }
            }
            break;
        }

        return 0;
    }

}