import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        DownloadConfig config = ConfigReader.readConfig("src/main/resources/download_config.txt");

        List<ChunkStatus> chunks = new ArrayList<>();

        double chunkSize = config.getTotalSizeMB() / config.getChunkCount();

        for (int i = 0; i < config.getChunkCount(); i++) {
            chunks.add(new ChunkStatus(i + 1, chunkSize));
        }

        ProgressMonitor monitor = new ProgressMonitor(chunks, config);

        Thread monitorThread = new Thread(monitor, "Progress-Monitor");
        monitorThread.setDaemon(true);
        monitorThread.start();

        List<Thread> workerThreads = new ArrayList<>();

        for (ChunkStatus chunk : chunks) {
            Thread workerThread = new Thread(
                    new DownloadWorker(chunk, config),
                    "Worker-" + chunk.getChunkId()
            );

            workerThreads.add(workerThread);
            workerThread.start();
        }

        try {
            for (Thread thread : workerThreads) {
                thread.join();
            }
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
            System.err.println("Main thread interrupted while waiting for workers: " + e.getMessage());
        }

        double totalDownloaded = 0;

        for (ChunkStatus chunk : chunks) {
            totalDownloaded += chunk.getDownloadedMB();
        }

        double totalSize = config.getTotalSizeMB();
        double progress = (totalDownloaded / totalSize) * 100;

        System.out.println();

        System.out.printf(
                "Progress: %.2f%% (%.2f / %.2f MB)%n",
                progress,
                totalDownloaded,
                totalSize
        );

        System.out.println("All workers finished.");
    }
}