//#define DShowDebug

using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using UnityEngine;


public class DShowPlayer
{
    private enum HapTextureFormat
    {
        HapTextureFormat_RGB_DXT1 = 0x83F0,
        HapTextureFormat_RGBA_DXT5 = 0x83F3,
        HapTextureFormat_YCoCg_DXT5 = 0x01
    };
    public string FilePath
    {
        get;
        private set;
    }
    private uint id = 0;
    public static bool showWarning = true;
    public DShowPlayer()
    {
        //release();
        id = CreateNative();
    }
    public void release()
    {
        if (id != 0)
        {
            if (videoTexture != null)
#if UNITY_EDITOR
                UnityEngine.Object.DestroyImmediate(videoTexture);
#else
                UnityEngine.Object.Destroy(videoTexture);
#endif
            ReleaseNative(id);
            id = 0;
        }
    }
    public void updateTexture(bool force = false)
    {
        if (videoTexture == null)
        {
            int width = GetWidthNative(id);
            int height = GetHeightNative(id);
            TextureFormat fmt = getHapFormat();            
            videoTexture = new Texture2D(width, height, fmt, false, true);
        }
        UpdateTextureNative(id, videoTexture.GetNativeTexturePtr());
    }
    private TextureFormat getHapFormat()
    {
        switch ((HapTextureFormat)GetHapFormatNative(id))
        {
            case HapTextureFormat.HapTextureFormat_RGB_DXT1:
                return TextureFormat.DXT1;
            default:
            case HapTextureFormat.HapTextureFormat_RGBA_DXT5:
                return TextureFormat.DXT5;
        }
    }
    #region MoviePlayerBase
    // virtual function
    public bool Load(DShowClip path)
    {
        //if (id == 0)
        //    create();
        if (videoTexture != null)
#if UNITY_EDITOR
            GameObject.DestroyImmediate(videoTexture);
#else
                GameObject.Destroy(videoTexture);
#endif

        if (path!=null && LoadNative(id, path.fullPath))
        {
            FilePath = path.fullPath;
            updateTexture(true);
            return true;
        }else
        {

        }
        return false;
    }
        
    Texture2D videoTexture = null;
    public void Play() { PlayNative(id);  }
    public void Pause(){ PauseNative(id); }
    public void Stop() { StopNative(id);  }

    
    public bool Loop { set { SetLoopNative(id, value); } get { return IsLoopNative(id); } }
    public Texture2D Texture { get {
            if (videoTexture == null && showWarning)
                Debug.LogWarning("videoTexture is null!!!");
            return videoTexture;
        } }
    public uint  Frame { set { SetFrameNative(id, value); } get { return GetFrameNative(id); } }
    public bool  IsPaused { get { return !IsPlaying; } }
    public bool  IsLoaded { get { return IsLoadedNative(id); } }
    public bool  IsPlaying { get { return IsPlayingNative(id); } }
    public bool  IsFinished { get { return IsMovieDoneNative(id); } }
    public uint  TotalNumFrames { get { return GetTotalNumFramesNative(id); } }
    public float GetDuration { get { return (float)GetDurationNative(id); } }
    public float GetCurrentTime { get { return (float)GetCurrentTimeNative(id); } }
    public float AudioVolume { get { return GetVolumeNative(id); } set { SetVolumeNative(id, value); } }
    
    //////////////////////////////////////////////////////////////////////////


    #endregion

    //////////////////////////////////////////////////////////////////////////
    #region DirectShowHapVideoPlayer.dll

#if DShowDebug
    const string DShowDll = "DirectShowHapVideoPlayerD";
#else
    const string DShowDll = "DirectShowHapVideoPlayer";
#endif

    [DllImport(DShowDll)]
    public static extern uint CreateNative();

    [DllImport(DShowDll)]
    public static extern void ReleaseNative(uint id);

    [DllImport(DShowDll)]
    public static extern uint GetHapFormatNative(uint id);

    [DllImport(DShowDll)]
    public static extern int GetWidthNative(uint id);

    [DllImport(DShowDll)]
    public static extern int GetHeightNative(uint id);

    [DllImport(DShowDll)]
    public static extern int GetFrameDataLengthNative(uint id);

    [DllImport(DShowDll)]
    public static extern bool IsFrameNewNative(uint id);

    [DllImport(DShowDll)]
    public static extern void SetVolumeNative(uint id, float volume);

    [DllImport(DShowDll)]
    public static extern float GetVolumeNative(uint id);

    //////////////////////////////////////////////////////////////////////////

    [DllImport(DShowDll)]
    public static extern bool LoadNative(uint id, [MarshalAs(UnmanagedType.LPWStr)] string fileName);

    [DllImport(DShowDll)]
    public static extern void PlayNative(uint id);

    [DllImport(DShowDll)]
    public static extern void PauseNative(uint id);

    [DllImport(DShowDll)]
    public static extern void StopNative(uint id);

    [DllImport(DShowDll)]
    public static extern void SetLoopNative(uint id, bool loop);

    [DllImport(DShowDll)]
    public static extern bool IsLoopNative(uint id);

    [DllImport(DShowDll)]
    public static extern bool IsMovieDoneNative(uint id);

    [DllImport(DShowDll)]
    public static extern void SetFrameNative(uint id, uint frame);

    [DllImport(DShowDll)]
    public static extern uint GetFrameNative(uint id);

    [DllImport(DShowDll)]
    public static extern bool IsPlayingNative(uint id);

    [DllImport(DShowDll)]
    public static extern bool IsLoadedNative(uint id);

    [DllImport(DShowDll)]
    public static extern uint GetTotalNumFramesNative(uint id);

    [DllImport(DShowDll)]
    public static extern double GetDurationNative(uint id);

    [DllImport(DShowDll)]
    public static extern double GetCurrentTimeNative(uint id);

    [DllImport(DShowDll)]
    public static extern void UpdateTextureNative(uint id, IntPtr tex);
    
#endregion
}