// 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;

namespace Deltares.DamEngine.Data.Geometry
{
    /// <summary>
    /// Class holding the boundaries of a geometry object
    /// </summary>
    public class GeometryBounds
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="GeometryBounds"/> class.
        /// </summary>
        public GeometryBounds() : this(0, 0, 0, 0) { }

        /// <summary>
        /// Initializes a new instance of the <see cref="GeometryBounds"/> class.
        /// </summary>
        /// <param name="left">The left.</param>
        /// <param name="right">The right.</param>
        /// <param name="bottom">The bottom.</param>
        /// <param name="top">The top.</param>
        public GeometryBounds(double left, double right, double bottom, double top)
        {
            Left = left;
            Right = right;
            Bottom = bottom;
            Top = top;
        }

        /// <summary>
        /// Gets or sets the left.
        /// </summary>
        /// <value>
        /// The left.
        /// </value>
        public double Left { get; set; }

        /// <summary>
        /// Gets or sets the top.
        /// </summary>
        /// <value>
        /// The top.
        /// </value>
        public double Top { get; set; }

        /// <summary>
        /// Gets or sets the right.
        /// </summary>
        /// <value>
        /// The right.
        /// </value>
        public double Right { get; set; }

        /// <summary>
        /// Gets or sets the bottom.
        /// </summary>
        /// <value>
        /// The bottom.
        /// </value>
        public double Bottom { get; set; }

        /// <summary>
        /// Determines whether the boundary contains the specified point.
        /// </summary>
        /// <param name="x">The x.</param>
        /// <param name="y">The y.</param>
        /// <returns></returns>
        public bool ContainsPoint(double x, double y)
        {
            return x >= Left && x <= Right && y >= Bottom && y <= Top;
        }

        /// <summary>
        /// Implements the operator +.
        /// </summary>
        /// <param name="bounds1">The bounds1.</param>
        /// <param name="bounds2">The bounds2.</param>
        /// <returns>
        /// The result of the operator.
        /// </returns>
        public static GeometryBounds operator +(GeometryBounds bounds1, GeometryBounds bounds2)
        {
            if (bounds2 == null)
            {
                return bounds1;
            }
            if (bounds1 == null)
            {
                return bounds2;
            }

            return new GeometryBounds(Math.Min(bounds1.Left, bounds2.Left),
                                      Math.Max(bounds1.Right, bounds2.Right),
                                      Math.Min(bounds1.Bottom, bounds2.Bottom),
                                      Math.Max(bounds1.Top, bounds2.Top));
        }
    }
}