// ***********************************************************************
// Copyright (c) 2009 Charlie Poole, Rob Prouse
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// ***********************************************************************

using System;

namespace NUnit.Framework.Constraints.Comparers
{
    /// <summary>
    /// Comparator for two <see cref="Char"/>s.
    /// </summary>
    internal class CharsComparer : IChainComparer
    {
        private readonly NUnitEqualityComparer _equalityComparer;

        internal CharsComparer(NUnitEqualityComparer equalityComparer)
        {
            _equalityComparer = equalityComparer;
        }

        public bool? Equal(object x, object y, ref Tolerance tolerance, bool topLevelComparison = true)
        {
            if (!(x is char) || !(y is char))
                return null;

            char xChar = (char)x;
            char yChar = (char)y;

            bool caseInsensitive = _equalityComparer.IgnoreCase;

            char c1 = caseInsensitive ? Char.ToLower(xChar) : xChar;
            char c2 = caseInsensitive ? Char.ToLower(yChar) : yChar;

            return c1 == c2;
        }
    }
}
