using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Windows.Forms;
using NGif;

namespace GifRec
{
    class GifRecorder
    {
        List<Bitmap> frames = new List<Bitmap>();
        Timer timer;
        Rectangle region;
        int iframe = 0;
        int duration = 5;
        int fps = 8;
        int ms = 0;
        string path;
        Action<string> SetText;
        Action<bool> ToggleStart;

        public GifRecorder(Rectangle _region, int _duration, Action<string> _SetText, Action<bool> _ToggleStart)
        {
            region = _region;
            duration = _duration;
            SetText = _SetText;
            ToggleStart = _ToggleStart;

            path = Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + "\\GifRec\\";

            if (!Directory.Exists(path))
                Directory.CreateDirectory(path);

            path += RandomString.Create(5) + ".gif";
        }

        public void Start()
        {
            frames.Clear();

            timer = new Timer();
            timer.Tick += new EventHandler(timer_Tick);
            timer.Interval = 1000 / fps;
            timer.Enabled = true;
        }

        private void timer_Tick(object sender, EventArgs e)
        {
            if (ms / 1000 == duration)
            {
                timer.Enabled = false;

                SetText("Creating GIF");

                System.Threading.Thread genGifThread = new System.Threading.Thread(GenerateGif);
                genGifThread.Start();

                return;
            }

            frames.Add(ScreenCap.Crop(ScreenCap.Fullscreen(), region));

            SetText("Elapsed time " + (ms / 1000 + 1));

            ms += 1000 / fps;
        }

        private void GenerateGif()
        {
            AnimatedGifEncoder e = new AnimatedGifEncoder();
            e.Start(path);
            e.SetDelay(1000 / fps);
            e.SetQuality(50);

            for (int i = 0; i < frames.Count; i++)
            {
                e.AddFrame((Image)frames[i]);
            }

            e.Finish();

            SetText("Done");
            Taskbar.Balloon(path, "GIF Saved");
            ToggleStart(true);
        }
    }
}