using MAME.Core.run_interface;
using System;
using UnityEngine;
using UnityEngine.UI;

public class UniVideoPlayer : MonoBehaviour, IVideoPlayer
{
    [SerializeField]
    private int mWidth;
    [SerializeField]
    private int mHeight;
    [SerializeField]
    private int mDataLenght;
    [SerializeField]
    private Texture2D m_rawBufferWarper;
    [SerializeField]
    private RawImage m_drawCanvas;
    [SerializeField]
    private RectTransform m_drawCanvasrect;
    int[] mFrameData;
    IntPtr mFrameDataPtr;

    private TimeSpan lastElapsed;
    public double videoFPS { get; private set; }
    bool bInit = false;

    private void Awake()
    {
        m_drawCanvas = GameObject.Find("GameRawImage").GetComponent<RawImage>();
        m_drawCanvasrect = m_drawCanvas.GetComponent<RectTransform>();
    }

    public void Initialize(int width, int height,IntPtr framePtr)
    {
        m_drawCanvas.color = Color.white;

        if (m_rawBufferWarper == null || mWidth != width || mHeight != height)
        {
            mWidth = width;
            mHeight = height;
            mDataLenght = width * height * 4;
            mFrameData = new int[mWidth * mHeight];
            //MAME来的是BGRA32，好好好
            m_rawBufferWarper = new Texture2D(mWidth, mHeight, TextureFormat.BGRA32, false);
            m_rawBufferWarper.filterMode = FilterMode.Point;
        }

        mFrameDataPtr = framePtr;
        m_drawCanvas.texture = m_rawBufferWarper;
        bInit = true;

        float targetWidth = ((float)mWidth / mHeight) * m_drawCanvasrect.rect.height ;
        m_drawCanvasrect.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, targetWidth);
    }

    public void StopVideo()
    {
        bInit = false;
        m_drawCanvas.color = new Color(0,0,0,0);
    }

    void Update()
    {
        if (!bInit) return;
        m_rawBufferWarper.LoadRawTextureData(mFrameDataPtr, mDataLenght);
        m_rawBufferWarper.Apply();
    }

    public void SubmitVideo(int[] data)
    {
        var current = UMAME.sw.Elapsed;
        var delta = current - lastElapsed;
        lastElapsed = current;
        videoFPS = 1d / delta.TotalSeconds;
        mFrameData = data;
    }
}