//-----------------------------------------------------------------------
// <copyright file="DikeCoordinateSystemConverter.cs" company="Deltares">
//  Copyright (c) 2010 Deltares. All rights reserved.
// </copyright>
// <author>Tom The</author>
// <email>tom.the@deltares.nl</email>
// <date>07-06-2010</date>
// <summary>
//  class for converting dike object coordinates from global to local system
// </summary>
//-----------------------------------------------------------------------

using System.Linq;
using Deltares.Geometry;
using Deltares.Geotechnics;
using Deltares.Geotechnics.SurfaceLines;

namespace Deltares.Dam.Data
{
    using System;
    using System.Collections.Generic;

    /// <summary>
    /// Exception class for DikeCoordinateSystemConverter
    /// </summary>
    public class DikeCoordinateSystemConverterException : Exception
    {
        public DikeCoordinateSystemConverterException(string message)
            : base(message)
        {
        }
    }
    /// <summary>
    /// class for converting dike object coordinates from global to local system
    /// </summary>
    public class DikeCoordinateSystemConverter
    {
        public void CreateLocalXZObjects(Dike dike)
        {
            ThrowIfInvalidDike(dike);
            foreach (Location location in dike.Locations.Where(x => null != x.SurfaceLine2))
            {
                // This can obviously only be done when SurfaceLine is available
                // In unit test situations sometimes the surfaceline is not defined
                ThrowIfAlreadyConvertedToLocalCoordinates(location.AreLocalXZObjectsCreated, String.Format("Location {0}", location.Name));
                var coordinateSystemConverter = new CoordinateSystemConverter();
                coordinateSystemConverter.DefineGlobalXYZBasedOnLine(location.SurfaceLine2.Geometry);
                PL1Line localPL1Line = (location.PL1Line != null) ? location.PL1Line.Clone() : null;
                SurfaceLine2 localSurfaceLine = location.SurfaceLine2.FullDeepClone();
                GeometryPoint localSheetPilePoint = (GeometryPoint)location.SheetPilePoint.Clone();
                coordinateSystemConverter.ConvertGlobalXYZToLocalXZ(localSurfaceLine.Geometry);
                if (localPL1Line != null)
                    coordinateSystemConverter.ConvertGlobalXYZToLocalXZ(localPL1Line);
                if (location.SheetPileLength > 0)
                {
                    coordinateSystemConverter.ConvertGlobalXYZToLocalXZ(localSheetPilePoint);
                }
                location.LocalXZPL1Line = localPL1Line;

                if (location.LocalXZSurfaceLine2 != null)
                {
                    location.LocalXZSurfaceLine2.Dispose();
                }
                location.LocalXZSurfaceLine2 = localSurfaceLine;
                location.LocalXZSheetPilePoint = localSheetPilePoint;
                location.AreLocalXZObjectsCreated = true;
            }
        }

        /// <summary>
        /// Validate dike and throw exception if not valid
        /// </summary>
        /// <param name="dike"></param>
        private static void ThrowIfInvalidDike(Dike dike)
        {
            try
            {
                dike.Validate();
            }
            catch (Exception exception)
            {
                throw new DikeCoordinateSystemConverterException(exception.Message);
            }
        }

        /// <summary>
        /// Throws exception if surfaceline already has been converted
        /// </summary>
        /// <param name="dike"></param>
        private static void ThrowIfAlreadyConvertedToLocalCoordinates(bool isConvertedToLocalCoordinates, string objectDescription)
        {
            if (isConvertedToLocalCoordinates)
            {
                throw new DikeCoordinateSystemConverterException(String.Format("{0} has already been converted from global to local coordinates", objectDescription));
            }
        }

    }
}