// Copyright (C) Stichting Deltares 2018. All rights reserved.
//
// This file is part of the Dam Engine.
//
// The Dam Engine is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// All names, logos, and references to "Deltares" are registered trademarks of
// Stichting Deltares and remain full property of Stichting Deltares at all times.
// All rights reserved.

using System;
using System.Collections.Generic;
using System.Linq;
using Deltares.DamEngine.Data.Geometry;
using Deltares.DamEngine.Data.Standard;

namespace Deltares.DamEngine.Data.General.PlLines
{
    public class PlLinePoint : GeometryPoint
    {
        public PlLinePoint() : this (0, 0) { }

        public PlLinePoint(double aX, double aZ) : base(aX, aZ) 
        {
        }
    }

    public class PlLine : PolyLine<PlLinePoint>, ICloneable<PlLine>
    {
        private PlLineType plLineType;

        public PlLineType PlLineType
        {
            get { return plLineType; }
            set
            {
                plLineType = value;
                PlLineTypeSpecified = true;
            }
        }

        public bool PlLineTypeSpecified { get; private set; }


        public bool IsPhreatic { get; set; }

        public int BoundaryLayer { get; set; }

        public PlLine Clone()
        {
            PlLine plLine = new PlLine() { IsPhreatic = this.IsPhreatic, BoundaryLayer = this.BoundaryLayer };
            foreach (PlLinePoint point in this.Points)
            {
                PlLinePoint newPoint = new PlLinePoint() { X = point.X, Y = point.Y, Z = point.Z };
                plLine.Points.Add(newPoint);
            }
            return plLine;
        }

        /// <summary>
        /// Gets the points in the segment between starting x and ending x
        /// </summary>
        /// <remarks>
        /// </remarks>
        /// <param name="startX"></param>
        /// <param name="endX"></param>
        /// <returns></returns>
        public IEnumerable<PlLinePoint> GetPointSegmentBetween(double startX, double endX)
        {
            if (endX < startX)
                throw new ArgumentException("End value is smaller then the start value");

            return from point in this.PointsOrderdByX
                   where point != null && (point.X > startX && point.X < endX)
                   orderby point.X ascending
                   select point;
        }

        /// <summary>
        /// Determines whether the given point is above, beneath or on the surfaceline.
        /// </summary>
        /// <param name="point"></param>
        /// <returns></returns>
        public PlLinePointPositionXzType PositionXzOfPointRelatedToPlLine(GeometryPoint point)
        {
            // if point is out of scope of the surface line, return beyond
            if ((point.X < points[0].X) || (point.X > points[points.Count - 1].X))
                return PlLinePointPositionXzType.BeyondPlLine;

            double z = ZFromX(point.X);
            if (Math.Abs(point.Z - z) < GeometryPoint.Precision)
            {
                return PlLinePointPositionXzType.OnPlLine;
            }
            else
            {
                if (point.Z > z)
                {
                    return PlLinePointPositionXzType.AbovePlLine;
                }
                else
                {
                    return PlLinePointPositionXzType.BelowPlLine;
                }
            }
        }

        private IEnumerable<PlLinePoint> PointsOrderdByX
        {
            get { return this.Points.OrderBy(p => p.X); }
        }

    }

}