using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Video;
using UnityEngine.UI;
using System;
[RequireComponent(typeof(VideoPlayer))]
public class VideoPanel : MonoBehaviour
{  
    public VideoPlayer videoPlayer;
    public Toggle beginToggle;
    public Slider videoSlider;
    public Text videoLength;//显示视频总时间
    public Text playLength;//显示视频已播时间
    public bool skip;  
    private float totalVideoLength;
    private bool isPlaying;
    
    // Use this for initialization
    void Start()
    {
        videoPlayer.sendFrameReadyEvents = true;//打开开关们才能接受frameReady事件
        videoPlayer.loopPointReached += OnFinish;
        videoPlayer.prepareCompleted += OnPrepared;
        videoPlayer.frameReady += OnFrameReady;
    }
    /// <summary>
    /// 更新播放中进度条的值和显示时间
    /// </summary>
    /// <param name="source"></param>
    /// <param name="frameIdx"></param>
    private void OnFrameReady(VideoPlayer source, long frameIdx)
    {       
        //由于存在跳帧的情况，在播完的情况下不会再给进度条和显示时间赋值，直接在完成的回调里赋值
        if (isPlaying)
        {
            float time = (float)videoPlayer.time;
            playLength.text = FloatToTime(time);
            if (!skip)
            {
                videoSlider.value = time;
            }
        }   
    }

    void OnDestroy()
    {
        videoPlayer.loopPointReached -= OnFinish;
        videoPlayer.prepareCompleted -= OnPrepared;
        videoPlayer.frameReady -= OnFrameReady;
    }

    // Update is called once per frame
    void Update()
    {
        /*
        if (videoPlayer.isPlaying)
        {
            float time = (float)videoPlayer.time;
            playLength.text = FloatToTime(time);
            if (!skip)
            {              
               videoSlider.value = (float)videoPlayer.time;              
            }
        }
        */
        if (skip)
        {
            float time = (float)videoPlayer.time;
            playLength.text = FloatToTime(time);        
        }
        
    }      
    /// <summary>
    /// 播放视频文件
    /// </summary>
    /// <param name="videoFile"></param>
    public void PlayVideo(string videoFile)
    {
        gameObject.SetActive(true);
        beginToggle.isOn = true;
        videoPlayer.url = videoFile;
        videoPlayer.Play();
        isPlaying = true;
    }
    /// <summary>
    /// 继续播放
    /// </summary>
    public void Play()
    {
        videoPlayer.Play();
        isPlaying = true;
    }
    /// <summary>
    /// 暂停播放
    /// </summary>
    public void Pause()
    {
        videoPlayer.Pause();
    }
    /// <summary>
    /// 停止播放
    /// </summary>
    public void StopVideo()
    {
        videoPlayer.Stop();
        gameObject.SetActive(false);
    }
    private void OnPrepared(VideoPlayer source)
    {
        totalVideoLength = videoPlayer.frameCount / videoPlayer.frameRate;
        videoSlider.maxValue = totalVideoLength;
        videoLength.text = FloatToTime(totalVideoLength);
    }

    private void OnFinish(VideoPlayer source)
    {
        beginToggle.isOn = false;        
        playLength.text = FloatToTime(totalVideoLength);
        isPlaying = false;
    }
    private string FloatToTime(float time)
    {
        //int hour = (int)time / 3600;
        //int min = (int)(time - hour * 3600) / 60;
        //int sec = (int)(time - hour * 3600) % 60;
        //string text = string.Format("{0:D2}:{1:D2}:{2:D2}", hour, min, sec);
        var timespan = TimeSpan.FromSeconds(time);
        var text = string.Format("{0:D2}:{1:D2}:{2:D2}", timespan.Hours, timespan.Minutes, timespan.Seconds);
        return text;
    }

}