import java.util.Objects;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.io.FileWriter;

import java.net.URL;
import java.io.BufferedInputStream;

public class Main {
    private boolean disable_networking = false;

    public void main(String[] args) {
        boolean help_enqueued = false;
        int verbosity = 1;
        
        int p = 0;
        while (p < args.length) {
            try {
                if (Objects.equals(args[p], "-h")) {    
                    help_enqueued = true;
                }
                else if (Objects.equals(args[p], "-v")) {
                    verbosity = Integer.parseInt(args[p+1]);
                    p += 2;
                }
                else if (Objects.equals(args[p], "--offline")) {
                    disable_networking = true;
                    p += 2;
                }
                else {
                    System.err.println("[ERROR] Unknown argument found: " + args[p] + "\n[ERROR] Please, use 'java Main -h' for help");
                    System.exit(1);
                }
            }
            catch (Exception e) {
                System.err.println("[ERROR] Exception while parsing CLI arguments: " + e);
                System.err.println("[ERROR] Aborting further execution.");
                System.exit(1);
            }
        }

        if (help_enqueued) {
            printHelp();
            System.exit(0);
        }
    }

    public fetchResource(String remote_url, String output_filename) {
        BufferedInputStream in = new BufferedInputStream(new URL(remote_url).openStream());
        FileOutputStream fileOutputStream = new FileOutputStream()

        byte dataBuffer[] = new byte[1024];
        int bytesRead;
        while ((bytesRead = in.read(dataBuffer, 0, 1024)) != -1) {
            fileOutputStream.write(dataBuffer, 0, bytesRead);
        }
    }

    public printHelp() {
        String help_text = "";

        try {
            File help_file = new File("src/help.txt");
            Scanner help_file_scanner = new Scanner(help_file);

        } catch (FileNotFoundException e) {
            System.err.println("[WARN] Help file missing.");
            if (!disable_networking) {
                System.err.println("[INFO] Trying to recover it from the git server");
                fetchResource("http://139.162.162.130:3000/", "src/help.txt");
                File help_file = new File("src/help.txt");
                Scanner help_file_scanner = new Scanner(help_file);
            } else {
                System.err.println("[INFO] --offline flag is set, not recovering");
                System.exit(1);
            }
        }
        
        while (help_file_scanner.hasNextLine()) {
            help_text += help_file_scanner.nextLine();
        }

        help_file_scanner.close();
                    
        System.out.println(help_text);
    }
}