using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media;
using Tango.BL.Interfaces;
using Tango.Core;
using Tango.Core.Threading;

namespace Tango.BL.Entities
{
    public partial class Segment : SegmentBase, ISegment
    {
        private double _lastLength;
        private LinearGradientBrush _brush;
        private ActionTimer _brushStopCollectionChangedActionTimer;

        #region Properties

        private TimeSpan _remainingTime;
        /// <summary>
        /// Gets or sets the remaining time for this segment to complete.
        /// </summary>
        [NotMapped]
        [JsonIgnore]
        public TimeSpan RemainingTime
        {
            get { return _remainingTime; }
            set { _remainingTime = value; RaisePropertyChangedAuto(); }
        }

        private TimeSpan _estimatedDuration;
        /// <summary>
        /// Gets or sets the estimated duration for this segment to complete.
        /// </summary>
        [NotMapped]
        [JsonIgnore]
        public TimeSpan EstimatedDuration
        {
            get { return _estimatedDuration; }
            set { _estimatedDuration = value; }
        }

        private double _progress;
        /// <summary>
        /// Gets or sets the segment progress within a running job.
        /// </summary>
        [NotMapped]
        [JsonIgnore]
        public double Progress
        {
            get { return _progress; }
            set { _progress = value; RaisePropertyChangedAuto(); }
        }

        private bool _started;
        /// <summary>
        /// Gets or sets a value indicating whether this segment has started.
        /// </summary>
        [NotMapped]
        [JsonIgnore]
        public bool Started
        {
            get { return _started; }
            set { _started = value; RaisePropertyChangedAuto(); }
        }

        private bool _completed;
        /// <summary>
        /// Gets or sets a value indicating whether this segment has completed.
        /// </summary>
        [NotMapped]
        [JsonIgnore]
        public bool Completed
        {
            get { return _completed; }
            set { _completed = value; RaisePropertyChangedAuto(); }
        }

        /// <summary>
        /// Gets the segment brush.
        /// </summary>
        [NotMapped]
        [JsonIgnore]
        public Brush SegmentBrush
        {
            get
            {
                return GetSegmentBrush();
            }
        }

        private bool _isInterSegment;
        /// <summary>
        /// Gets or sets a value indicating whether this segment is an inter segment.
        /// </summary>
        [NotMapped]
        [JsonIgnore]
        public bool IsInterSegment
        {
            get { return _isInterSegment; }
            set { _isInterSegment = value; RaisePropertyChangedAuto(); }
        }

        /// <summary>
        /// Gets a value indicating whether this segment has any out of gamut brush stops.
        /// </summary>
        [NotMapped]
        [JsonIgnore]
        public bool HasOutOfGamutBrushStop
        {
            get { return BrushStops.Any(x => x.IsOutOfGamut); }
        }

        /// <summary>
        /// Gets the length of this segment including the job length factor <see cref="JobBase.LengthPercentageFactor"/>.
        /// </summary>
        [NotMapped]
        [JsonIgnore]
        public double LengthWithFactor
        {
            get { return Job != null && !IsInterSegment ? (Length + Length * (Job.LengthPercentageFactor / 100)) : Length; }
        }

        [NotMapped]
        [JsonIgnore]
        public String DisplayLengthWithFactor
        {
            get {
                double length = Job != null && !IsInterSegment ? (Length + Length * (Job.LengthPercentageFactor / 100)) : Length;
                return length.ToString("N0") + "m";
            }
        }

        #endregion

        #region Constructors

        /// <summary>
        /// Initializes a new instance of the <see cref="Segment" /> class.
        /// </summary>
        public Segment() : base()
        {

        }

        #endregion

        #region Brush Stops Collection Changed

        private void BrushStops_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            if (_brushStopCollectionChangedActionTimer == null)
            {
                _brushStopCollectionChangedActionTimer = new ActionTimer(TimeSpan.FromMilliseconds(100));
            }

            _brushStopCollectionChangedActionTimer.ResetReplace(() =>
            {
                foreach (var stop in BrushStops.ToList())
                {
                    stop.RaiseOffsetChanged();
                }
                //Item#7059 - 
                //if (BrushStops.Count > 0)
                //{
                //    BrushStops.First().OffsetPercent = 0;
                //}
                //if (BrushStops.Count > 1)
                //{
                //    BrushStops.Last().OffsetPercent = 100;
                //}

                RaiseSegmentBrushChanged();
            });
        }

        #endregion

        #region Properties Changed

        /// <summary>
        /// Called when the Length has changed.
        /// </summary>
        /// <param name="length"></param>
        protected override void OnLengthChanged(double length)
        {
            base.OnLengthChanged(length);

            if (_lastLength != length)
            {
                BrushStops.ToList().ForEach(x => x.RaiseOffsetChanged());
                _lastLength = Length;
                RaisePropertyChanged(nameof(LengthWithFactor));
            }
        }

        /// <summary>
        /// Called when the BrushStops has changed.
        /// </summary>
        /// <param name="brushstops"></param>
        protected override void OnBrushStopsChanged(SynchronizedObservableCollection<BrushStop> brushstops)
        {
            base.OnBrushStopsChanged(brushstops);

            if (brushstops != null)
            {
                brushstops.CollectionChanged -= BrushStops_CollectionChanged;
                brushstops.CollectionChanged += BrushStops_CollectionChanged;

                foreach (var stop in brushstops.ToList())
                {
                    stop.RaiseOffsetChanged();
                }

                RaiseSegmentBrushChanged();
            }
        }

        #endregion

        #region Public Methods

        /// <summary>
        /// Gets the segment brush.
        /// </summary>
        /// <returns></returns>
        public LinearGradientBrush GetSegmentBrush()
        {
            if (_brush == null || _brush.GradientStops.Count != BrushStops.Count)
            {
                GradientStopCollection stops = new GradientStopCollection();

                foreach (var stop in BrushStops.ToList().OrderBy(x => x.StopIndex).ToList())
                {
                    stops.Add(new GradientStop(stop.IsTransparent ? Colors.Transparent : stop.Color, stop.OffsetPercent / 100d));
                }

                LinearGradientBrush brush = new LinearGradientBrush();
                brush.StartPoint = new Point(0, 0);
                brush.EndPoint = new Point(1, 0);

                brush.GradientStops = stops;

                _brush = brush;
                return brush;
            }
            else
            {
                for (int i = 0; i < BrushStops.Count; i++)
                {
                    _brush.GradientStops[i].Color = BrushStops[i].IsTransparent ? Colors.Transparent : BrushStops[i].Color;
                    _brush.GradientStops[i].Offset = BrushStops[i].OffsetPercent / 100d;
                }

                return _brush;
            }
        }

        public void UpdateMiddleColorBrush()
        {
            if (BrushStops.Count == 5)
            {
                BrushStops[2].Color = GetRelativeRGB(BrushStops[1].Color, BrushStops[3].Color, 0, 1, 0.5);
            }
        }

        public BrushStop FirstBrushStop
        {
            get { if (BrushStops.Count == 1)//Intersegment?? - null
                return BrushStops[0];
            else if(BrushStops.Count >= 5)
                return BrushStops[1];
            else
                return null; }
        }

        public static Color GetRelativeRGB(Color first, Color second, double firstOffset, double secondOffset, double offset)
        {
            var color = new Color();
            var range = (secondOffset - firstOffset);
            var realoffset = offset - firstOffset;

            color.ScA = (float)(realoffset * (second.ScA - first.ScA) / range + first.ScA);
            color.ScR = (float)(realoffset * (second.ScR - first.ScR) / range + first.ScR);
            color.ScG = (float)(realoffset * (second.ScG - first.ScG) / range + first.ScG);
            color.ScB = (float)(realoffset * (second.ScB - first.ScB) / range + first.ScB);

            return color;
        }

        /// <summary>
        /// Raises the <see cref="SegmentBrush"/> property changed event.
        /// </summary>
        public void RaiseSegmentBrushChanged()
        {
            RaisePropertyChanged(nameof(SegmentBrush));
        }

        /// <summary>
        /// Raises the <see cref="LengthWithFactor"/> property changed event.
        /// </summary>
        public void RaiseLengthWithFactorChanged()
        {
            RaisePropertyChanged(nameof(LengthWithFactor));
        }

        /// <summary>
        /// Adds a new brush stop to this segment.
        /// </summary>
        /// <returns></returns>
        public BrushStop AddBrushStop()
        {
            BrushStop stop = new BrushStop();

            var lastStop = BrushStops.OrderBy(x => x.StopIndex).LastOrDefault();

            if (lastStop != null && lastStop.ColorSpace != null)
            {
                stop.ColorSpace = lastStop.ColorSpace;
            }
            else if (Job != null)
            {
                if (Job.ColorSpace != null)
                {
                    stop.ColorSpace = Job.ColorSpace;
                }
                else
                {
                    stop.ColorSpaceGuid = Job.ColorSpaceGuid;
                }
            }

            if (BrushStops.Count > 0)
            {
                stop.StopIndex = BrushStops.Max(x => x.StopIndex) + 1;
                stop.OffsetPercent = 100;
            }
            else
            {
                stop.StopIndex = 1;
            }

            stop.Segment = this;
            stop.Color = Colors.White;

            if (stop.ColorSpace != null)
            {
                if (stop.BrushColorSpace == Enumerations.ColorSpaces.LAB)
                {
                    stop.L = 100;
                    stop.A = 0;
                    stop.B = 0;
                }
            }

            BrushStops.Add(stop);

            return stop;
        }

        /// <summary>
        /// Gets the next segment.
        /// </summary>
        /// <returns></returns>
        public Segment GetNextSegment()
        {
            return Job.OrderedSegments.FirstOrDefault(x => x.SegmentIndex > SegmentIndex);
        }

        /// <summary>
        /// Gets the previous segment.
        /// </summary>
        /// <returns></returns>
        public Segment GetPreviousSegment()
        {
            return Job.OrderedSegments.LastOrDefault(x => x.SegmentIndex < SegmentIndex);
        }

        /// <summary>
        /// Gets the collection of previous segments.
        /// </summary>
        /// <returns></returns>
        public List<Segment> GetPreviousSegments()
        {
            return Job.OrderedSegments.Where(x => x.SegmentIndex < SegmentIndex).ToList();
        }

        /// <summary>
        /// Gets the estimated duration for this segment by the specified process parameters.
        /// </summary>
        /// <param name="processParameters">The process parameters.</param>
        /// <returns></returns>
        /// <exception cref="ArgumentException">Process parameters dying speed cannot be zero.</exception>
        public TimeSpan GetEstimatedDuration(ProcessParametersTable processParameters)
        {
            if (processParameters.DyeingSpeed == 0)
            {
                throw new ArgumentException("Process parameters dying speed cannot be zero.");
            }
            return TimeSpan.FromSeconds(Length / (processParameters.DyeingSpeed / 100d));
        }

        /// <summary>
        /// Creates a GDI version of this segment brush.
        /// </summary>
        /// <param name="width">The width.</param>
        /// <param name="height">The height.</param>
        /// <returns></returns>
        public System.Drawing.Brush CreateGdiBrush(int width, int height)
        {
            if (BrushStops.Count > 1)
            {
                System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new System.Drawing.PointF(0, 0), new System.Drawing.Point(width, height), System.Drawing.Color.Black, System.Drawing.Color.Black);

                System.Drawing.Drawing2D.ColorBlend blend = new System.Drawing.Drawing2D.ColorBlend();

                List<System.Drawing.Color> colors = new List<System.Drawing.Color>();
                List<float> offsets = new List<float>();

                foreach (var stop in BrushStops.ToList().OrderBy(x => x.OffsetPercent))
                {
                    colors.Add(stop.Color.ToGdiColor());
                    offsets.Add((float)stop.OffsetPercent / 100f);
                }

                blend.Colors = colors.ToArray();
                blend.Positions = offsets.ToArray();

                brush.InterpolationColors = blend;

                return brush;
            }
            else if (BrushStops.Count == 1)
            {
                return new System.Drawing.SolidBrush(BrushStops.First().Color.ToGdiColor());
            }
            else
            {
                return System.Drawing.Brushes.White;
            }
        }

        #endregion

        #region Internal Methods

        /// <summary>
        /// Raises the <see cref="HasOutOfGamutBrushStop"/> property changed event.
        /// </summary>
        internal void RaiseHasOutOfGamutBrushStop()
        {
            RaisePropertyChanged(nameof(HasOutOfGamutBrushStop));
        }

        #endregion

        #region Cloning

        /// <summary>
        /// Clones this segment with its brush stops.
        /// </summary>
        /// <returns></returns>
        public override Segment Clone()
        {
            Segment cloned = base.Clone();

            cloned.BrushStops = BrushStops.Select(x => x.Clone()).ToSynchronizedObservableCollection();

            foreach (var stop in cloned.BrushStops)
            {
                stop.SegmentGuid = cloned.Guid;
                stop.Segment = cloned;
            }

            return cloned;
        }

        /// <summary>
        /// Clones this segment and assigns it to the specified job.
        /// </summary>
        /// <param name="job">The job.</param>
        /// <returns></returns>
        public Segment Clone(Job job)
        {
            Segment cloned = base.Clone();

            cloned.BrushStops = BrushStops.Select(x => x.Clone(cloned)).ToSynchronizedObservableCollection();

            cloned.Job = job;
            cloned.JobGuid = job.Guid;

            return cloned;
        }

        /// <summary>
        /// Clones this segment with its brush stops.
        /// </summary>
        /// <returns></returns>
        ISegment ISegment.Clone()
        {
            return Clone() as ISegment;
        }

        /// <summary>
        /// Clones this segment and assigns it to the specified job.
        /// </summary>
        /// <param name="job">The job.</param>
        /// <returns></returns>
        ISegment ISegment.Clone(Job job)
        {
            return Clone(job) as ISegment;
        }

        #endregion

        #region Delete

        /// <summary>
        /// Removes this entity and all dependent entities from the specified db context.
        /// </summary>
        /// <param name="context">The context.</param>
        public override void Delete(ObservablesContext context)
        {
            base.Delete(context);

            if (BrushStops != null && BrushStops.Count > 0)
            {
                context.BrushStops.RemoveRange(BrushStops);
            }

            context.Segments.Remove(this);
        }

        #endregion
    }
}