using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;

namespace JD.Serialization
{

    public partial class TapeReferenceClip
    {
        [Browsable(true)]
        [DisplayName("Tape Id")]
        [Description("File name of the tape (.tape)")]
        [ReadOnly(true)]
        public string TapeId
        {
            get { return Path.ToString(); }
            set
            {
                Path = new Path(value);
                OnPropertyChanged();
            }
        }

        [Browsable(true)]
        [Category("Time")]
        [DisplayName("Loop Count")]
        [Description("The number of time the reference is played.")]
        public float LoopCount
        {
            get
            {
                var tapeDuration = TapeDuration;
                return tapeDuration == 0 ? 1 : Duration / (float)tapeDuration;
            }
            set
            {
                var tapeDuration = TapeDuration;
                if (tapeDuration != 0)
                {
                    Duration = (int)Math.Round(tapeDuration * value);
                }
            }
        }

        private Tape _referredTape;
        [Browsable(true)]
        public Tape ReferredTape
        {
            get
            {
                if (_referredTape == null && Tape != null && Tape.IsOffline)
                {
                    try
                    {
                        var serializer = new LuaSerializer();
                        _referredTape = (Tape)serializer.LoadObjectFromFile(Path.getAbsolute());
                    }
                    catch (Exception ex)
                    {
                        _referredTape = new Tape
                        {
                            Id = Path.getAbsolute(),
                            LoadingError = ex
                        };
                    }
                }
                
                return _referredTape;
            }
            set { _referredTape = value; }
        }

        public bool IsUnresolved
        {
            get
            {
                var tape = ReferredTape;
                return tape == null;
            }
        }

        public int TapeDuration
        {
            get
            {
                var tape = ReferredTape;
                if (tape == null)
                {
                    return 0;
                }

                var editionContext = tape.EditionContext?.StartFrame ?? 0;
                return tape.Clips.Where(clip => clip.IsActive)
                                 .Select(clip => clip.StopFrame)
                                 .DefaultIfEmpty(editionContext).Max() - editionContext;
            }
        }

        public override IEnumerable<CollisionArea> CollisionAreas
        {
            get
            {
                var tape = ReferredTape;

                if (tape != null)
                {
                    foreach (var clip in tape.Clips)
                    {
                        foreach (var loopSection in this.EnumerateLoopSections())
                        {
                            if (!loopSection.IsUnusedSpace)
                            {
                                foreach (var area in clip.CollisionAreas.OfType<EffectCollisionArea>())
                                {
                                    area.StartFrame -= area.Clip.ContextualOffset;
                                    area.StopFrame -= area.Clip.ContextualOffset;

                                    if (loopSection.IsReversed)
                                    {
                                        var newStart = loopSection.Length - area.StopFrame;
                                        var newStop = loopSection.Length - area.StartFrame;

                                        area.StartFrame = newStart;
                                        area.StopFrame = newStop;
                                    }

                                    area.StartFrame += loopSection.Start;
                                    area.StopFrame += loopSection.Start;

                                    area.StartFrame = Math.Max(StartFrame, area.StartFrame);
                                    area.StopFrame = Math.Min(StopFrame, area.StopFrame);
                                    area.Clip = this;
                                    yield return area;
                                }
                            }
                        }
                    }
                }

                foreach (var area in base.CollisionAreas)
                {
                    yield return area;
                }
            }
        }
    }
}