using System;
using System.Linq;
using System.Windows.Forms;
using JD.Application.Utils;
using JD.Application.View.Timeline;
using JD.Audio.Annotations;
using JD.Maths.Utils;
using JD.Timeline.Document;
using JD.Timeline.View.ClipView;
using JD.VideoPlayer.Project;
using TeaBox;
using TeaBox.ObjectModel;
using JD.Serialization;
using Application = TeaBox.ObjectModel.Application;

namespace AutoDance.View
{
    public class AutoDancePrewiewVideoPad : AbstractPadContent
    {
        private readonly Control _control;
        private TapeDocumentView _currentReplayView;

        #region Properties

        #endregion

        public AutoDancePrewiewVideoPad()
        {
            _control = new PictureBox { Dock = DockStyle.Fill };
            _control.Paint += _control_Paint;
            _control.HandleCreated += _control_HandleCreated;

            Application.Main.Views.SelectedItemChanged += Views_SelectedItemChanged;
        }

        public override Control Control
        {
            get { return _control; }
        }

        private TapeDocumentView CurrentReplayReplayView
        {
            get { return _currentReplayView; }
            set
            {
                if (_currentReplayView != null)
                {
                    _currentReplayView.ClipView.Timeline.CurrentTimeChanged -= CurrentView_Changed;
                    _currentReplayView.Document.Tape.PropertyChanged -= CurrentView_Changed;
                }

                _currentReplayView = value;

                if (_currentReplayView != null)
                {
                    // When updating the content of a clip, update the time so we get the preview right now.
                    _currentReplayView.ClipView.Timeline.CurrentTimeChanged += CurrentView_Changed;
                    _currentReplayView.Document.Tape.PropertyChanged += CurrentView_Changed;
                }
            }
        }

        private void CurrentView_Changed(object sender, EventArgs e)
        {
            _control.Invalidate();
        }

        void _control_Paint(object sender, PaintEventArgs e)
        {
            var currentView = CurrentReplayReplayView;
            if (currentView != null)
            {
                var currentTime = currentView.ClipView.Timeline.BeatFromTimeUnit(currentView.ClipView.Timeline.TimeCursor.Time);
                var toPaint = ComputePlayingBeat(currentTime);
                currentView.ClipView.Tape.VideoSpriteSheet().Paint(e.Graphics, toPaint, e.ClipRectangle);
            }
        }

        private void _control_HandleCreated(object sender, EventArgs e)
        {
            Views_SelectedItemChanged(null, null);
        }

        private void Views_SelectedItemChanged(object sender, EventArgs e)
        {
            CurrentReplayReplayView = Application.Main.Views.SelectedItem as TapeDocumentView;
        }

        public BeatUnit ComputePlayingBeat(BeatUnit currentBeat)
        {
            if (_currentReplayView == null || _currentReplayView.Document.Tape.TryGetWave() == null)
            {
                return new BeatUnit(0);
            }

            BeatUnit replayBeat;

            var autoDanceDocumentView = Application.Main.Views.SelectedItem as AutoDanceDocumentView;
            if (autoDanceDocumentView != null && ComputeReplayTime(autoDanceDocumentView, currentBeat.Value, out replayBeat))
            {
                currentBeat = replayBeat;
            }
            return currentBeat;
        }

        private bool ComputeReplayTime(AutoDanceDocumentView view, float currentTime, out BeatUnit replayTime)
        {
            // We use the first replay clip that is under the current time cursor
            // but if there is also a record clip at the same time that is selected, we use this one first...


            var document = (AutoDanceDocument)view.MainDocument;
            var activeTrackWidget = view.ClipView.TrackView.ActiveTrack as TapeTrackWidget;
            var activeClipType = activeTrackWidget == null ? null : activeTrackWidget.Track.ClipTypes().FirstOrDefault();

            var prospects = (from clip in document.Tape.Clips
                             where currentTime.IsBetween(clip.StartBeat, clip.StopBeat - 0.001f)
                             where clip is ReplayClipNew || clip is RecordClipMarker
                             orderby clip.GetType() == activeClipType descending
                             select clip);

            var replayClip = prospects.FirstOrDefault() as ReplayClipNew;

            if (replayClip != null)
            {
                return replayClip.GetReplayBeat(currentTime, out replayTime);
            }

            replayTime = new BeatUnit(0);
            return false;
        }
    }

}