using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;

namespace sharpknife.Captchas
{
    public abstract class Captcha
    {
        public abstract float Contrast { get; }

        public static Captcha GetCaptcha(string name)
        {
            Captcha captcha = null;

            switch (name)
            {
                case "Numbers":
                    captcha = new NumbersCaptcha();
                    break;
                case "Strings":
                    captcha = new StringsCaptcha();
                    break;
                case "PetFinder":
                    captcha = new PetFinderCaptcha();
                    break;
                case "UpsideDown":
                    captcha = new UpsideDownCaptcha();
                    break;
                default:
                    throw new Exception("Undefined captcha");
            }

            return captcha;
        }

        public abstract void Clean(Bitmap image);

        public abstract string Decaptcha(Bitmap image);
    }
}