using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace PDF_Text_Stripper;

public class Program
{

    private static void PDFTextStripper(string file)
    {
        string altFileName = Path.ChangeExtension(file, ".txt");
        if(File.Exists(altFileName))
            File.Delete(altFileName);
        org.apache.pdfbox.pdmodel.PDDocument pdfDocument = org.apache.pdfbox.pdmodel.PDDocument.load(file);
        org.apache.pdfbox.util.PDFTextStripper stripper = new();
        string text = stripper.getText(pdfDocument);
        pdfDocument.close();
        File.WriteAllText(altFileName, text);
    }

    public static void Secondary(List<string> args)
    {
        int silentIndex = args.IndexOf("s");
        if (silentIndex > -1)
            args.RemoveAt(silentIndex);
        try
        {
            if (args.Any() && File.Exists(args[0]))
                PDFTextStripper(args[0]);
            else
                throw new Exception(args[0]);
        }
        catch (Exception ex)
        {
            Console.WriteLine(string.Concat(ex.Message, Environment.NewLine, ex.StackTrace));
        }
        if (silentIndex > -1)
            Console.WriteLine("Done. Bye");
        else
        {
            Console.WriteLine("Done. Press 'Enter' to end");
            _ = Console.ReadLine();
        }
    }

    public static void Main(string[] args)
    {
        if (args is not null)
            Secondary(args.ToList());
        else
            Secondary(new List<string>());
    }
}