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

namespace PDF_Text_Stripper;

public class Program
{

    private static void PortableDocumentFormatWriteText(string sourceFileName)
    {
        object item;
        string pageText;
        string pagePDFFile;
        string pageTextFile;
        java.io.File file = new(sourceFileName);
        org.apache.pdfbox.util.Splitter splitter = new();
        string sourcePath = Path.GetDirectoryName(sourceFileName) ?? throw new Exception();
        string sourceFileNameWithoutExtension = Path.GetFileNameWithoutExtension(sourceFileName);
        org.apache.pdfbox.pdmodel.PDDocument pdDocument = org.apache.pdfbox.pdmodel.PDDocument.load(file);
        java.util.List list = splitter.split(pdDocument);
        java.util.ListIterator iterator = list.listIterator();
        org.apache.pdfbox.util.PDFTextStripper dataStripper = new();
        for (short i = 1; i < short.MaxValue; i++)
        {
            if (!iterator.hasNext())
                break;
            item = iterator.next();
            pagePDFFile = string.Concat(sourcePath, @"\", sourceFileNameWithoutExtension, "_", i, ".pdf");
            if (File.Exists(pagePDFFile))
                File.Delete(pagePDFFile);
            pageTextFile = Path.ChangeExtension(pagePDFFile, ".txt");
            if (File.Exists(pageTextFile))
                File.Delete(pageTextFile);
            if (item is not org.apache.pdfbox.pdmodel.PDDocument pd)
                continue;
            pageText = dataStripper.getText(pd);
            pd.save(pagePDFFile);
            pd.close();
            File.WriteAllText(pageTextFile, pageText);
        }
        pdDocument.close();
    }

    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]))
                PortableDocumentFormatWriteText(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>());
    }
}