// Copyright (C) Stichting Deltares 2020. All rights reserved.
//
// This file is part of the Layer On Slope Tool.
//
// The Layer On Slope Tool 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;

namespace Deltares.LayerOnSlopeTool.Data
{

    /// <summary>
    /// Holds the possible point types.
    /// </summary>
    public enum CharacteristicPointType
    {
        None,
        SurfaceLevelOutside = 1, // Maaiveld buitenwaarts
        BottomRiverChannel = 2, // Bodem geul
        InsertRiverChannel = 3, // Insteek geul
        DikeToeAtRiver = 5, // Teen dijk buitenwaarts
        ShoulderTopOutside = 6, // Kruin buitenberm
        ShoulderBaseOutside = 7, // Insteek buitenberm
        DikeTopAtRiver = 8, // Kruin buitentalud
        DikeLine = 9, // referentielijn
        TrafficLoadOutside = 10, // Verkeersbelasting kant buitenwaarts
        TrafficLoadInside = 11, // Verkeersbelasting kant binnenwaarts
        DikeTopAtPolder = 12, // Kruin binnentalud
        ShoulderBaseInside = 13, // Insteek binnenberm
        ShoulderTopInside = 14, // Kruin binnenberm
        DikeToeAtPolder = 15, // Teen dijk binnenwaarts
        DitchDikeSide = 16, // Insteek sloot dijkzijde
        BottomDitchDikeSide = 17, // Slootbodem dijkzijde
        BottomDitchPolderSide = 18, // Slootbodem polderzijde
        DitchPolderSide = 19, // Insteek sloot polderzijde
        SurfaceLevelInside = 25, // Maaiveld binnenwaarts
    }

    /// <summary>
    /// Defines the surface line point
    /// </summary>
    public class SurfaceLinePoint
    {
        /// <summary>
        /// Gets or sets the x coordinate.
        /// </summary>
        /// <value>
        /// The x coordinate.
        /// </value>
        public double XCoordinate { get; set; }

        /// <summary>
        /// Gets or sets the z coordinate.
        /// </summary>
        /// <value>
        /// The z coordinate.
        /// </value>
        public double ZCoordinate { get; set; }

        /// <summary>
        /// Gets or sets the type of the point.
        /// </summary>
        /// <value>
        /// The type of the point.
        /// </value>
        public CharacteristicPointType PointType { get; set; }

        /// <summary>
        /// Determines whether the difference between the location of the given point and 
        /// this one are within the given precision. 
        /// </summary>
        /// <param name="other">The other.</param>
        /// <param name="precision">The precision.</param>
        /// <returns></returns>
        public bool LocationEquals(SurfaceLinePoint other, double precision = 0.001)
        {
            if (ReferenceEquals(other, null))
            {
                return false;
            }
            if (ReferenceEquals(other, this))
            {
                return true;
            }

            return AlmostEquals(XCoordinate,other.XCoordinate, precision) &&
                   AlmostEquals(ZCoordinate,other.ZCoordinate, precision);
        }

        private bool AlmostEquals(double double1, double double2, double precision)
        {
            if (double.IsNaN(double1) && double.IsNaN(double2))
            {
                return true;
            }

            if (double.IsNaN(double1) || double.IsNaN(double2))
            {
                return false;
            }

            return (Math.Abs(double1 - double2) <= precision);
        }
    }
}