using System;

using System.Collections.Generic;

​

public class Slide

{

    public string Text { get; init; }

    public Slide(string text)

    {

        Text = text;

    }

}

public class PdfDocument

{

    public void AddPage(string text)

    {

        Console.WriteLine("Adding a page to pdf");

    }

}

public class Movie

{

    public void AddFrame(string text, int duration)

    {

        Console.WriteLine("Adding a frame to movie");

    }

}

public enum PresentationFormat

{

    PDF,

    Movie

}

​

public interface IPresentationBuilder

{

    void AddSlide(Slide slide);

}

public class MovieBuilder : IPresentationBuilder

{

    Movie movie = new Movie();

​

    public void AddSlide(Slide slide)

    {

        movie.AddFrame(slide.Text, 10);

    }

​

    public Movie getMovie() { return movie; }

}

public class PdfDocumentBuilder : IPresentationBuilder

{

    PdfDocument pdfDocument = new PdfDocument();

​

    public void AddSlide(Slide slide)

    {

        pdfDocument.AddPage(slide.Text);

    }

​

    public PdfDocument GetPdfDocument() => pdfDocument;

}

public class Presentation

{

    List<Slide> slides = new List<Slide>();

​

    public void AddSlide(Slide slide)

    {

        slides.Add(slide);

    }

​

    public void Export(IPresentationBuilder builder)

    {

        foreach (var slide in slides)

        {

            builder.AddSlide(slide);

        }

    }

}

public class Program

{

    public static void Main()

    {

        var presentation = new Presentation();

        presentation.AddSlide(new Slide("Intro Page"));

        presentation.AddSlide(new Slide("Main Page"));

        presentation.AddSlide(new Slide("Summary Page"));

​

        var builder = new MovieBuilder();

        presentation.Export(builder);

        builder.getMovie();

        var builder2 = new PdfDocumentBuilder();

        presentation.Export(builder2);

        builder2.GetPdfDocument();

    }

}