using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.PPC.Jobs.Models;

namespace Tango.PPC.Jobs.UndoRedoCommands
{
    public class AddBrushStopCommand : IUndoRedoCommand
    {
        private JobModel _jobModel;
        private SegmentModel _segment;
        private SegmentModel _createdNewSegment;
        private BrushStopModel _brushStopModelToAdd;
        private int _index;

        public AddBrushStopCommand(JobModel job, SegmentModel segment, BrushStopModel addedbrush)
        {
            _jobModel = job;
            _segment = segment;
            _index = _jobModel.GroupingSegments.IndexOf(_segment);
            _brushStopModelToAdd = addedbrush;
            _createdNewSegment = null;
        }

        public void Execute()
        {
            if (_segment == null)
                return;
            //SolidColor
            if (_segment.BrushStops.Count == 0)
            {
                _brushStopModelToAdd.Position = BrushStopModel.PositionStatus.FirstColor;
                _segment.BrushStops.Add(_brushStopModelToAdd);
            }
            //Add Second BrushStop
            else if (_segment.BrushStops.Count == 1)// add gradient
            {
                BrushStopModel currentBrushStop = _segment.BrushStops[0];
                _segment.CreateGradientBrushes(_segment.BrushStops[0], _brushStopModelToAdd);
                _segment.RaiseSegmentBrushChanged();
            }
            else //Create new Segment and Add BrushStop
            {
                _createdNewSegment = _segment.Clone();
                var length = _segment.Length / 2;
                _createdNewSegment.Length = length;
                _segment.Length = length;
                _createdNewSegment.SegmentIndex = _segment.SegmentIndex + 1;
                _createdNewSegment.CreateGradientBrushes(_brushStopModelToAdd.Clone(), _segment.SecondBrushStop);
                _createdNewSegment.RaiseSegmentBrushChanged();

                _segment.AddOrReplaceSecondBrush(_brushStopModelToAdd);
                _segment.UpdateMiddleColorBrush();
                _segment.RaiseSegmentBrushChanged();
                _segment.ArrangeBrushStopsIndexes();
                _createdNewSegment.ArrangeBrushStopsIndexes();

                _jobModel.Segments.Add(_createdNewSegment);
                if ((_index+1) < _jobModel.GroupingSegments.Count())
                {
                    _jobModel.GroupingSegments.Insert(_index + 1, _createdNewSegment);
                }
                else
                    _jobModel.GroupingSegments.Add(_createdNewSegment);
                _jobModel.ArrangeSegmentsIndixes();
            }
        }

        public void UnExecute()
        {
            if (_segment == null)
                return;

            if (_createdNewSegment != null)
            {
                BrushStopModel secondbrush = _createdNewSegment.SecondBrushStop;
                _segment.AddOrReplaceSecondBrush(secondbrush);
                _segment.UpdateMiddleColorBrush();
                _segment.RaiseSegmentBrushChanged();
                _segment.ArrangeBrushStopsIndexes();
                _jobModel.Segments.Remove(_createdNewSegment);
                _jobModel.GroupingSegments.Remove(_createdNewSegment);
                _jobModel.ArrangeSegmentsIndixes();
            }
            else if(_segment.IsGradient)
            {
                BrushStopModel firstbrush = _segment.FirstBrushStop;
                _segment.BrushStops.Clear();
                _segment.BrushStops.Add(firstbrush);
                _segment.ArrangeBrushStopsIndexes();
            }
            else if(_segment.BrushStops.Count == 1)
            {
                _segment.BrushStops.Clear();
            }
        }
    }
}