package com.it_jaros.networkScanner;

import java.util.HashSet;
import java.util.Set;

public class CliParser {
    
    public ScanOptions parseArgs(String[] args) {
        if (args.length < 1 || args[0].trim().equals("")) {
            throw new IllegalArgumentException("No argument given");
        }
        
        Set<String> targets = new HashSet<>();
        int socketLimit = 1000;
        int delayInMillis = 0;
        int timeoutInMillis = 1000;
        int maxWorkersPerHost = 1000;
        String ports = "1-1024";
        for (int i = 0; i < args.length; i++) {
            final String currentArg = args[i];
            if (!currentArg.startsWith("-")) {
                targets.add(currentArg);
                continue;
            }

            try {
                switch (currentArg) {
                    case "--help", "-h":
                        usageAndExit();
                        break;
                    case "--socketLimit", "-sl":
                        socketLimit = Integer.parseInt(args[++i]);
                        break;
                    case "--delay", "-d":
                        delayInMillis = Integer.parseInt(args[++i]);
                        break;
                    case "--timeout", "-t":
                        timeoutInMillis = Integer.parseInt(args[++i]);
                        break;
                    case "--ports", "-p":
                        ports = args[++i];
                        break;
                    case "--maxWorkersPerHost", "-wh":
                        maxWorkersPerHost = Integer.parseInt(args[++i]);
                        break;
                    default:
                        throw new IllegalArgumentException("No such param " + currentArg);
                }
            } catch (IndexOutOfBoundsException | NumberFormatException e) {
                System.out.printf("Missing or wrong argument for option %s", currentArg);
                System.exit(2);
            }
        }

        System.out.printf(
                "Parsed arguments: targets('%s'), ports(%s), socketLimit(%s), delayInMillis(%s), timeoutInMillis(%s), maxWorkersPerHost(%s)%n",
                targets, ports, socketLimit, delayInMillis, timeoutInMillis, maxWorkersPerHost);
        
        return new ScanOptions(targets.stream().toList(), socketLimit, delayInMillis, timeoutInMillis, maxWorkersPerHost, ports);
    }

    public void usageAndExit() {
        System.err.println("""
                Usage:
                    java -jar scanner.jar [OPTIONS] <host>

                Options:
                    --delay, -d: Waiting period in millis for connection attempts for a host; (Default: 0)
                    --socketLimit, -sl: Socket Connection limit for a host; (Default: 1000)
                    --timeout, -t: Timeout per connection attempt, 0 means infinite: (Default: 1000)
                    --ports, -p: Ports to be scanned
                    --maxWorkersPerHost, -wh: Virtual Worker Threads run per target. Higher doesn't mean necessarily faster. But the more you use the more RAM is required. (Default: 1000)

                Examples:
                    java -jar scanner.jar localhost
                    java -jar scanner.jar fd00::1
                """);
        System.exit(1);
    }
}