Implement download worker

src/java/ProgressMonitor.java

@@ -0,0 +1,70 @@
+import java.util.List;
+
+public class ProgressMonitor implements Runnable {
+
+    private final String fileName;
+    private final int totalSizeMB;
+    private final List<ChunkStatus> chunks;
+    private final long monitorDelayMs;
+
+    public ProgressMonitor(DownloadConfig config, List<ChunkStatus> chunks) {
+        this.fileName = config.getFileName();
+        this.totalSizeMB = config.getTotalSizeMB();
+        this.chunks = chunks;
+        this.monitorDelayMs = 500;
+    }
+
+    @Override
+    public void run() {
+        // TODO:
+        // Repeatedly check chunk progress until all chunks are completed.
+        // In each loop:
+        // 1. Read the downloaded size from every chunk
+        // 2. Add all downloaded amounts to totalDownloadedMB
+        // 3. Count completed chunks
+        // 4. Print a progress message
+        // 5. If completedChunks == chunks.size(), print a final monitor message and stop
+        // 6. Otherwise sleep for monitorDelayMs and continue
+
+
+
+        while (true) {
+            double totalDownloadedMB = 0.0;
+            int completedChunks = 0;
+
+            for (ChunkStatus chunk : chunks) {
+                totalDownloadedMB += chunk.getDownloadedMB();
+
+                if (chunk.isCompleted()) {
+                    completedChunks++;
+                }
+            }
+
+            double percent = 0.0;
+            if (totalSizeMB > 0) {
+                percent = (totalDownloadedMB * 100.0) / totalSizeMB;
+            }
+
+            System.out.printf(
+                    "Progress for %s: %.1f/%.1f MB (%.2f%%), completed chunks: %d/%d%n",
+                    fileName,
+                    totalDownloadedMB,
+                    (double) totalSizeMB,
+                    percent,
+                    completedChunks,
+                    chunks.size()
+            );
+
+
+            // TODO:
+            // If all chunks are completed, print a final message and exit the loop
+
+            try {
+                Thread.sleep(monitorDelayMs);
+            } catch (InterruptedException e) {
+                System.out.println("Progress monitor interrupted.");
+                return;
+            }
+        }
+    }
+}