using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using UnityEngine;

using System.IO;


public class RT3script : MonoBehaviour
{
    public RenderTexture colorImage, depthImage;
    public string outputRTMP = "rtmp://your_monaserver_address/live/stream_key";
    public string mp4name = "my_movie_depth_ffmpeg.mp4";

    public Texture2D outputImage;

    public int targetFrameRate = 30;
    int frameCount = 0;

    private Process ffmpegProcess;
    private string outputMP4;


    // Start is called before the first frame update
    void Start()
    {
        // Define file path for movie
        outputMP4 = Path.Combine(Path.GetTempPath(), mp4name);
        UnityEngine.Debug.Log(outputMP4);
        if (File.Exists(outputMP4)) {
            File.Delete(outputMP4);
        }



        colorImage = new RenderTexture(256,256,16,RenderTextureFormat.ARGB32);
        depthImage = new RenderTexture(256,256,16,RenderTextureFormat.ARGB32);
        outputImage = new Texture2D(512,512, TextureFormat.RGBA32, false);

        Camera c = GetComponent<Camera>();
        c.targetTexture = colorImage;

        Camera depthCamera = new GameObject("DepthCamera").AddComponent<Camera>();

        depthCamera.CopyFrom(c);
        // depthCamera.transform.position = c.transform.position;
        // depthCamera.transform.rotation = c.transform.rotation;

        // depthCamera.fieldOfView = c.fieldOfView;
        // depthCamera.nearClipPlane = c.nearClipPlane;
        // depthCamera.farClipPlane = c.farClipPlane;

        // depthCamera.orthographic = c.orthographic;

        depthCamera.targetTexture = depthImage;

        depthCamera.clearFlags = CameraClearFlags.SolidColor;
        depthCamera.backgroundColor = Color.black;

        depthCamera.SetReplacementShader(Shader.Find("Custom/DepthOnly"), "");

        // Initialize FFmpeg process
        StartFFmpeg();


    }

    // Update is called once per frame
    void Update()
    {
        float expectedFrames = Time.timeSinceLevelLoad * targetFrameRate;
        if (frameCount < expectedFrames) {
            // Graphics.CopyTexture(colorImage, 0, 0, 0, 0, 256, 256, outputImage, 0, 0, 0, 0);
            // Graphics.CopyTexture(depthImage, 0, 0, 0, 0, 256, 256, outputImage, 0, 0, 256, 0);

            RenderTexture.active = colorImage;
            outputImage.ReadPixels(new Rect(0, 0, 256, 256), 0, 0);
            outputImage.Apply();

            RenderTexture.active = depthImage;
            outputImage.ReadPixels(new Rect(0, 0, 256, 256), 256, 0);
            outputImage.Apply();

            // Get the raw pixel data and write it to FFmpeg's input stream
            byte[] frameBytes = outputImage.GetRawTextureData();
            ffmpegProcess.StandardInput.BaseStream.Write(frameBytes, 0, frameBytes.Length);
            ffmpegProcess.StandardInput.BaseStream.Flush();

            frameCount += 1;
        }
    }

    void OnDestroy() 
    {
    }

    private void OnApplicationQuit()
    {
        // Stop FFmpeg process when the application quits
        if (ffmpegProcess != null && !ffmpegProcess.HasExited)
        {
            ffmpegProcess.StandardInput.Close();
            // ffmpegProcess.Kill();
            ffmpegProcess.WaitForExit();
            ffmpegProcess = null;
            UnityEngine.Debug.Log("FFmpeg process stopped (hopefully) ");

        }
    }

    private void StartFFmpeg()
    {
        // Setup FFmpeg process with arguments for RTMP streaming
        string ffmpegArgs = $"-y -f rawvideo -vcodec rawvideo -pix_fmt rgb24 -s {outputImage.width}x{outputImage.height} " +
                            // $"-r {targetFrameRate} -i pipe:0 -c:v libx264 -preset ultrafast -tune zerolatency -pix_fmt yuv420p -f flv {outputRTMP}";
                            $"-r 30 -i pipe:0 -c:v libx264 -preset ultrafast -pix_fmt yuv420p \"{outputMP4}\"";

        ffmpegProcess = new Process();
        ffmpegProcess.StartInfo.FileName = "F:\\ffmpeg-7.1-full_build\\bin\\ffmpeg.exe";
        ffmpegProcess.StartInfo.Arguments = ffmpegArgs;
        ffmpegProcess.StartInfo.UseShellExecute = false;
        ffmpegProcess.StartInfo.RedirectStandardInput = true;
        ffmpegProcess.StartInfo.CreateNoWindow = true;
        ffmpegProcess.Start();

        UnityEngine.Debug.Log("FFmpeg process started with arguments: " + ffmpegArgs);
    }
}