using Rubberduck.Parsing.Abstract;

namespace Rubberduck.Parsing.Expressions;

public sealed class LogicalEqvExpression : Expression
{
    private readonly IExpression _left;
    private readonly IExpression _right;

    public LogicalEqvExpression(IExpression left, IExpression right)
    {
        _left = left;
        _right = right;
    }

    public override IValue Evaluate()
    {
        var left = _left.Evaluate();
        var right = _right.Evaluate();
        if (left == null || right == null)
        {
            return null;
        }
        else if (left.ValueType == ValueType.Bool && right.ValueType == ValueType.Bool)
        {
            var leftNumber = Convert.ToInt64(left.AsDecimal);
            var rightNumber = Convert.ToInt64(right.AsDecimal);
            return new BoolValue(new DecimalValue(~(leftNumber ^ rightNumber)).AsBool);
        }
        else
        {
            var leftNumber = Convert.ToInt64(left.AsDecimal);
            var rightNumber = Convert.ToInt64(right.AsDecimal);
            return new DecimalValue(~(leftNumber ^ rightNumber));
        }
    }
}
