using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using UnityEngine;

namespace Assets.AR
{
    public class VideoPlayerControl
    {
        private const float MinVideoPlaybackSpeedChangeInterval = 0.2f;
        private const float MaxPlaybackSpeed = 1.5f;
        private const float MaxCameraDistanceError = 200f;
        private DateTime lastPlaybackSpeedChange = DateTime.MinValue;
        private float fixedTimeFrame;
        private DateTime fixedTimeSeekFinished = DateTime.MinValue;
        private int lapCount = 1;
        private double lapLength;

        public float FixedVideoFrame => this.fixedTimeFrame;

        //public IDistanceSource RiderDistance { get; set; 

        public AVProVideoPlayer VideoPlayer { get; private set; }

        //public ISpeedSource RiderSpeed { get; set; }

        public VideoPointsSync VideoSyncSource { get; set; }

        public ARRoute Route { get; set; }

        public int VideoFrameOffset { get; set; }

        public float CameraFollowDistance { get; set; }

        public bool AllowUpdate { get; set; } = true;

        public float CameraDistanceError { get; private set; }

        public bool IsTimeFixed { get; private set; }

        public float FrameIndexDistanceCorrection { get; private set; }

        public bool IsMultilap => this.lapCount > 1;

        public void SetVideoPlayer(AVProVideoPlayer player) => this.VideoPlayer = player;

        public void SetMultiLap(int lapCount, double lapLength)
        {
            this.lapCount = lapCount;
            this.lapLength = lapLength;
        }

        public void FixTimeByDistance(float distance) => this.FixTimeByFrame(this.VideoSyncSource.GetVideoFrameAtDistance(distance));

        public void FixTimeByFrame(float frame)
        {
            this.IsTimeFixed = true;
            this.fixedTimeFrame = frame;
            this.fixedTimeSeekFinished = DateTime.MinValue;
            if (this.VideoPlayer.IsPaused)
                this.VideoPlayer.Resume();
            this.VideoPlayer.SetPlaybackSpeed(0.25f);
            this.VideoPlayer.Seek((long)frame, true);
        }

        //public void UnFixTime()
        //{
        //    this.IsTimeFixed = false;
        //    float videoFrameAtDistance = this.VideoSyncSource.GetVideoFrameAtDistance(this.RiderDistance.LapDistance);
        //    float num = this.VideoSyncSource.AverageVideoSpeed(videoFrameAtDistance, videoFrameAtDistance);
        //    float playbackSpeed = (double)num != 0.0 ? this.RiderSpeed.Speed / num : 0.0f;
        //    if (this.VideoPlayer.IsPaused)
        //        this.VideoPlayer.Resume();
        //    this.VideoPlayer.SetPlaybackSpeed(playbackSpeed);
        //    this.lastPlaybackSpeedChange = DateTime.UtcNow;
        //    this.VideoPlayer.Seek((long)videoFrameAtDistance, true);
        //}

        private void SkipVideoToDistance(float distance) => this.SkipVideoToFrame((long)this.VideoSyncSource.GetVideoFrameAtDistance(distance));

        private void SkipVideoToFrame(long frame) => this.VideoPlayer.Seek(frame);

        public void UpdateVideoPlaybackSpeed(float speed, float routeDistance)
        {
            if (!this.AllowUpdate)
                return;
            if (this.IsTimeFixed)
            {
                if (this.VideoPlayer.IsSeeking)
                    return;
                if (this.fixedTimeSeekFinished == DateTime.MinValue)
                    this.fixedTimeSeekFinished = DateTime.UtcNow;
                if (DateTime.UtcNow.Subtract(this.fixedTimeSeekFinished).TotalSeconds < 0.25)
                    return;
                if ((double)this.VideoPlayer.CurrentFrame > (double)this.fixedTimeFrame)
                    this.VideoPlayer.Pause();

                this.VideoPlayer.UpdateCurrentFrame();
                this.FrameIndexDistanceCorrection = 0.0f;
            }
            else
            {
                float videoFrameAtDistance1 = this.VideoSyncSource.GetVideoFrameAtDistance(routeDistance);
                float val2 = routeDistance - this.CameraFollowDistance;
                //if (this.IsMultilap && (double)this.RiderDistance.RouteDistance > (double)distance && (double)val2 < 0.0)
                //    val2 += (float)this.lapLength;
                float distance = Math.Max(0.0f, val2);
                float frame = this.VideoSyncSource.GetVideoFrameAtDistance(distance) + (float)this.VideoFrameOffset;
                if (this.Route != null && (double)this.Route.GetVisibility(frame) > 10.0)
                    frame = (float)this.Route.GetFrameAtDistance(Math.Max(0.0, this.Route.GetDistanceForFrame((double)videoFrameAtDistance1) - (double)this.CameraFollowDistance)) + (float)this.VideoFrameOffset;

                this.VideoPlayer.UpdateCurrentFrame();
             
                float distanceForVideoFrame = this.VideoSyncSource.GetDistanceForVideoFrame(this.VideoPlayer.CurrentFrame - (float)this.VideoFrameOffset);
                float f;
                if (this.Route != null)
                {
                    double frameAtDistance = this.Route.GetFrameAtDistance(this.Route.GetDistanceForFrame((double)this.VideoPlayer.CurrentFrame - (double)this.VideoFrameOffset) + (double)Mathf.Min(routeDistance, this.CameraFollowDistance));
                    f = videoFrameAtDistance1 - (float)frameAtDistance;
                }
                else
                    f = frame - (this.VideoPlayer.CurrentFrame - (float)this.VideoFrameOffset);
                float num1 = Mathf.Clamp01(VTMath.Lerp(0.0f, 1f, 100f, 0.0f, Mathf.Abs(f)));
                this.FrameIndexDistanceCorrection = f * num1;
                this.CameraDistanceError = distance - distanceForVideoFrame;
                if (this.IsMultilap)
                {
                    float num2 = distance - (distanceForVideoFrame + (float)this.lapLength);
                    if ((double)Math.Abs(num2) < (double)Math.Abs(this.CameraDistanceError) && (double)Math.Abs(num2) < 200.0)
                        return;
                }
                if ((double)Math.Abs(this.CameraDistanceError) > 200.0)
                {
                    this.SkipVideoToDistance(distance);
                }
                else
                {
                    double totalSeconds = DateTime.UtcNow.Subtract(this.lastPlaybackSpeedChange).TotalSeconds;
                    if (totalSeconds >= 0.0 && totalSeconds < 0.20000000298023224)
                        return;
                    float num3 = 1f;
                    float num4 = num3 * speed;
                    if ((double)Math.Abs(distance + num4 - this.VideoSyncSource.GetDistanceForVideoFrame((float)((double)this.VideoPlayer.CurrentFrame - (double)this.VideoFrameOffset + (double)num3 * (double)this.VideoPlayer.PlaybackSpeed * (double)this.VideoPlayer.FrameRate))) <= (double)Math.Abs(this.CameraDistanceError))
                        return;
                    float videoFrameAtDistance2 = this.VideoSyncSource.GetVideoFrameAtDistance(routeDistance + num4);
                    float num5 = this.VideoSyncSource.AverageVideoSpeed(videoFrameAtDistance1, videoFrameAtDistance2);
                    float playbackSpeed = Mathf.Clamp(((double)num5 != 0.0 ? speed / num5 : 0.0f) + (float)(((double)frame - ((double)this.VideoPlayer.CurrentFrame - (double)this.VideoFrameOffset)) / 2.0) / this.VideoPlayer.FrameRate, 0.0f, 1.5f);
                    if ((double)playbackSpeed == (double)this.VideoPlayer.PlaybackSpeed || !this.VideoPlayer.SetPlaybackSpeed(playbackSpeed))
                        return;
                    this.lastPlaybackSpeedChange = DateTime.UtcNow;
                }
            }
        }

        internal void UpdateVideoPlaybackSpeed(double speed, float distance)
        {
            throw new NotImplementedException();
        }
    }
}