/* Heavily based on https://github.com/FNA-XNA/FNA/blob/master/src/Media/Xiph/Video.cs */
using System;

namespace MoonWorks.Video
{
	public class Video : IDisposable
	{
		public IntPtr Handle => handle;
		public int YWidth => yWidth;
		public int YHeight => yHeight;
		public int UVWidth => uvWidth;
		public int UVHeight => uvHeight;
		public double FramesPerSecond => fps;

		private IntPtr handle;
		private int yWidth;
		private int yHeight;
		private int uvWidth;
		private int uvHeight;
		private double fps;

		private bool disposed;

		public Video(string filename)
		{
			Theorafile.th_pixel_fmt format;

			if (!System.IO.File.Exists(filename))
			{
				throw new ArgumentException("Video file not found!");
			}

			if (Theorafile.tf_fopen(filename, out handle) < 0)
			{
				throw new ArgumentException("Invalid video file!");
			}

			Theorafile.tf_videoinfo(
				handle,
				out yWidth,
				out yHeight,
				out fps,
				out format
			);

			if (format == Theorafile.th_pixel_fmt.TH_PF_420)
			{
				uvWidth = yWidth / 2;
				uvHeight = yHeight / 2;
			}
			else if (format == Theorafile.th_pixel_fmt.TH_PF_422)
			{
				uvWidth = yWidth / 2;
				uvHeight = yHeight;
			}
			else if (format == Theorafile.th_pixel_fmt.TH_PF_444)
			{
				uvWidth = yWidth;
				uvHeight = yHeight;
			}
			else
			{
				throw new NotSupportedException("Unrecognized YUV format!");
			}
		}

		protected virtual void Dispose(bool disposing)
		{
			if (!disposed)
			{
				if (disposing)
				{
					// TODO: dispose managed state (managed objects)
				}

				Theorafile.tf_close(ref handle);
				disposed = true;
			}
		}

		~Video()
		{
		    // Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
		    Dispose(disposing: false);
		}

		public void Dispose()
		{
			// Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
			Dispose(disposing: true);
			GC.SuppressFinalize(this);
		}
	}
}