using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

using System.Windows.Threading;

namespace VideoPlayer
{
    public partial class Page : UserControl
    {
        private DispatcherTimer timer;

        private bool IsVideoScrubberLocked { get; set; }

        private double unmutedVolume;

        public Page()
        {   
            InitializeComponent();

            btnPlayPause.Checked +=new RoutedEventHandler(btnPlayPause_Checked);
            btnPlayPause.Unchecked += new RoutedEventHandler(btnPlayPause_Unchecked);

            VideoElement.CurrentStateChanged += new RoutedEventHandler(VideoElement_CurrentStateChanged);
            VideoElement.MediaOpened += new RoutedEventHandler(VideoElement_MediaOpened);

            timer = new DispatcherTimer();
            timer.Interval = TimeSpan.FromMilliseconds(50);
            timer.Tick += new EventHandler(timer_Tick);

            sliderScrubber.MouseLeftButtonUp += new MouseButtonEventHandler(sliderScrubber_MouseLeftButtonUp);
            sliderScrubber.MouseLeftButtonDown += new MouseButtonEventHandler(sliderScrubber_MouseLeftButtonDown);

            sliderVolume.ValueChanged += new RoutedPropertyChangedEventHandler<double>(sliderVolume_ValueChanged);

            btnMute.Checked += new RoutedEventHandler(btnMute_Checked);
            btnMute.Unchecked += new RoutedEventHandler(btnMute_Unchecked);
        }

        void btnMute_Unchecked(object sender, RoutedEventArgs e)
        {
            VideoElement.Volume = unmutedVolume;
            btnMute.Content = "Mute";
        }

        void btnMute_Checked(object sender, RoutedEventArgs e)
        {
            unmutedVolume = VideoElement.Volume;
            VideoElement.Volume = 0;
            btnMute.Content = "UnMute";
        }

        void VideoElement_MediaOpened(object sender, RoutedEventArgs e)
        {
            sliderVolume.Value = VideoElement.Volume;
        }

        void sliderVolume_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
        {
            VideoElement.Volume = sliderVolume.Value;
        }

        void sliderScrubber_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            IsVideoScrubberLocked = true;
        }

        void sliderScrubber_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            IsVideoScrubberLocked = false;
            VideoElement.Position = TimeSpan.FromMilliseconds(
                VideoElement.NaturalDuration.TimeSpan.TotalMilliseconds * sliderScrubber.Value);
        }

        void timer_Tick(object sender, EventArgs e)
        {
            if (VideoElement.NaturalDuration.TimeSpan.TotalSeconds > 0 && !IsVideoScrubberLocked)
            {
                txtVideoPosition.Text =
                    string.Format("{0:00}:{1:00}", VideoElement.Position.Minutes, VideoElement.Position.Seconds);

                sliderScrubber.Value = VideoElement.Position.TotalSeconds / 
                    VideoElement.NaturalDuration.TimeSpan.TotalSeconds;
            }
        }

        void VideoElement_CurrentStateChanged(object sender, RoutedEventArgs e)
        {
            if (VideoElement.CurrentState == MediaElementState.Playing)
            {
                timer.Start();
            }
            else
            {
                timer.Stop();
            }
        }

        void btnPlayPause_Unchecked(object sender, RoutedEventArgs e)
        {
            VideoElement.Play();
            btnPlayPause.Content = "Pause";
        }

        private void btnPlayPause_Checked(object sender, RoutedEventArgs e)
        {
            VideoElement.Pause();
            btnPlayPause.Content = "Play";
        }
    }
}