package com.it_jaros.networkScanner;

import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class ProgressBar {

    private ScheduledExecutorService ui = Executors.newSingleThreadScheduledExecutor();
    private List<Progress> hosts;

    public void start(List<Progress> hosts) {
        this.hosts = hosts;
        // move cursor down depending on how many hosts have to be scanned
        hosts.forEach((h) -> System.out.print("\n"));
        ui.scheduleAtFixedRate(() -> {
            drawProgress();
        }, 1, 200, TimeUnit.MILLISECONDS);
    }

    private void drawProgress() {
        // clear bars by moving cursor up
        final int lines = hosts.size();
        System.out.print("\u001b[" + lines + "A");

        // paint a bar per host
        for (Progress progress : hosts) {
            drawBar(progress);
        }
    }

    private void drawBar(Progress progress) {
        System.out.print("\u001b[2K\r");
        System.out.println(createBar(
                progress.host() + " open=" + progress.open().get(),
                progress.done().get(),
                progress.total()));
    }

    public String createBar(String label, int done, int total) {
        int width = 30;
        double pct = total == 0 ? 1.0 : (done / (double) total);
        int filled = (int) (pct * width);

        String b = "[" + "#".repeat(filled) + "-".repeat(width - filled) + "]";
        int percent = (int) (pct * 100);

        return String.format("%-25s %s %3d%% (%d/%d)", label, b, percent, done, total);
    }

    public void stop() {
        ui.shutdown();
        try {
            ui.awaitTermination(10, TimeUnit.SECONDS);
            // we need to draw one last time for the 100% to appear
            drawProgress();
        } catch (InterruptedException ignored) {
        }
    }

    void onPortFinished(Progress p) {
        p.done().incrementAndGet();
    }
}