Main.java

package org.example;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Map;

import org.example.analyzer.JarAnalyzer;
import org.example.analyzer.MetricsCalculator;
import org.example.model.ClassInfo;
import org.example.model.MetricsResult;
import org.example.output.ConsoleMetricsPrinter;
import org.example.output.JsonMetricsPrinter;
import org.example.output.MetricsPrinter;

public class Main {
    public static void main(String[] args) {
        String inputPath = null;
        String outputPath = null;

        for (int i = 0; i < args.length; i++) {
            switch (args[i]) {
                case "--input" -> {
                    if (i + 1 < args.length) {
                        inputPath = args[++i];
                    }
                }
                case "--output" -> {
                    if (i + 1 < args.length) {
                        outputPath = args[++i];
                    }
                }
                default -> throw new IllegalArgumentException("Unknown option: " + args[i]);
            }
        }

        Path jarPath = getValidJarPath(inputPath);

        try {
            analyzeJarInternal(jarPath, outputPath);
        } catch (IOException e) {
            throw new RuntimeException("Error analyzing jar " + jarPath + ": " + e.getMessage(), e);
        }
    }

    private static Path getValidJarPath(String inputPath) {
        if (inputPath == null) {
            throw new IllegalArgumentException("JAR file is not provided");
        }

        Path jarPath = Path.of(inputPath);
        if (!Files.exists(jarPath)) {
            throw new IllegalArgumentException("JAR file does not exist: " + jarPath);
        }

        return jarPath;
    }

    private static void analyzeJarInternal(Path jarPath, String outputPath) throws IOException {
        JarAnalyzer jarAnalyzer = new JarAnalyzer();
        MetricsCalculator calculator = new MetricsCalculator();

        Map<String, ClassInfo> classes = jarAnalyzer.getJarClassInfo(jarPath);
        MetricsResult result = calculator.calculate(classes, jarPath.getFileName().toString());

        MetricsPrinter consoleMetricsPrinter = new ConsoleMetricsPrinter();
        consoleMetricsPrinter.print(result);

        if (outputPath != null) {
            MetricsPrinter jsonMetricsPrinter = new JsonMetricsPrinter(Path.of(outputPath));
            jsonMetricsPrinter.print(result);
        }
    }
}