using FFMpegCore.FFMPEG.Pipes;
using Instances;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.IO.Pipes;
using System.Text;
using System.Threading.Tasks;

namespace FFMpegCore.FFMPEG.Argument
{
    public class InputPipeArgument : Argument, IInputPipe
    {
        public string PipeName { get; private set; }
        public IPipeSource Source { get; private set; }

        private NamedPipeServerStream pipe;

        public InputPipeArgument(IPipeSource source)
        {
            Source = source;
            PipeName = "FFMpegCore_Pipe_" + Guid.NewGuid();
        }

        public void OpenPipe()
        {
            if (pipe != null)
                throw new InvalidOperationException("Pipe already has been opened");

            pipe = new NamedPipeServerStream(PipeName);
        }

        public void ClosePipe()
        {
            pipe?.Dispose();
            pipe = null;
        }

        public void Write(byte[] buffer, int offset, int count)
        {
            if(pipe == null)
                throw new InvalidOperationException("Pipe shouled be opened before");

            pipe.Write(buffer, offset, count);
        }

        public Task WriteAsync(byte[] buffer, int offset, int count)
        {
            if (pipe == null)
                throw new InvalidOperationException("Pipe shouled be opened before");

            return pipe.WriteAsync(buffer, offset, count);
        }

        public override string GetStringValue()
        {
            return $"-y {Source.GetFormat()} -i \\\\.\\pipe\\{PipeName}";
        }

        public void FlushPipe()
        {
            pipe.WaitForConnection();
            Source.FlushData(this);
        }


        public async Task FlushPipeAsync()
        {
            await pipe.WaitForConnectionAsync();
            await Source.FlushDataAsync(this);
        }
    }
}