import java.io.*;
import java.nio.file.*;
import net.sourceforge.pmd.*;
import net.sourceforge.pmd.renderers.*;

public class PmdRunner {
    public static void main(String[] args) throws Exception {
        if (args.length < 2) {
            System.err.println("Usage: PmdRunner <filePath|- for stdin> <rulesetPath>");
            System.exit(1);
            return;
        }

        String filePath = args[0];
        String rulesetPath = args[1];

        Path tempFile = null;
        if ("-".equals(filePath)) {
            String code = new String(System.in.readAllBytes());
            tempFile = Files.createTempFile("pmd-stdin-", ".java");
            Files.writeString(tempFile, code);
            filePath = tempFile.toString();
        }

        try {
            PMDConfiguration config = new PMDConfiguration();
            config.addRuleSet(rulesetPath);

            Writer writer = new StringWriter();
            JsonRenderer renderer = new JsonRenderer();
            renderer.setWriter(writer);

            try (PmdAnalysis pmd = PmdAnalysis.create(config)) {
                pmd.files().addFile(Path.of(filePath));
                pmd.addRenderer(renderer);
                pmd.performAnalysis();
            }

            System.out.print(writer.toString());
        } finally {
            if (tempFile != null) {
                Files.deleteIfExists(tempFile);
            }
        }
    }
}