package com.it_jaros.jscanner;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.List;
import java.util.stream.Stream;

/**
 * Object holder for stateful volatile data during scan
 */
public class Scan {
    private final Stream<String> hosts;
    private final String ports;
    private final Counter counter;
    private final ProgressBar progressBar;

    private Scan(Stream<String> hosts, String ports, boolean quiet) {
        this.hosts = hosts;
        this.ports = ports;
        this.counter = new Counter();
        this.progressBar = new ProgressBar(quiet);
    }

    public int getPeakConcurrentConnects() {
        return counter.max();
    }

    public static Scan create(ScanOptions options) throws IOException {
        if (options.hostsFile() != null) {
            return create(options.hostsFile(), options.ports(), options.quiet());
        }
        return create(options.hostsArgv(), options.ports(), options.quiet());
    }

    /**
     * Create Scan based on either a source file or stdin
     *
     * @param sourceFile
     * @param ports
     * @param quiet
     * @return
     * @throws IOException
     */
    public static Scan create(String sourceFile, String ports, boolean quiet) throws IOException {
        Stream<String> hosts;
        if ("-".equals(sourceFile)) {
            BufferedReader stdinReader = new BufferedReader(new InputStreamReader(System.in));
            hosts = stdinReader.lines();
        } else {
            BufferedReader reader = Files.newBufferedReader(Path.of(sourceFile));
            hosts = reader.lines().onClose(() -> {
                try {
                    reader.close();
                } catch (IOException e) {
                    // ignored
                }
            });
        }

        return create(hosts, ports, quiet);
    }

    private static Scan create(Stream<String> lines, String ports, boolean quiet) {
        return new Scan(lines, ports, quiet);
    }

    public static Scan create(List<String> hostsArgv, String ports, boolean quiet) {
        return new Scan(hostsArgv.stream(), ports, quiet);
    }

    public Stream<String> getHosts() {
        return hosts;
    }

    public String getPorts() {
        return ports;
    }

    public void start() {
        progressBar.start();
    }

    public void stop() {
        progressBar.stop();
        hosts.close(); // close stream
    }

    public void addHostProgress(Progress progress) {
        progressBar.add(progress);
    }

    public void incSocketCounter() {
        counter.inc();
    }

    public void decSocketCounter() {
        counter.dec();
    }
}