using System.Linq.Expressions;

namespace SqlSugar
{
    public class NewExpressionResolve : BaseResolve
    {
        public NewExpressionResolve(ExpressionParameter parameter) : base(parameter)
        {
            var expression = base.Expression as NewExpression;
            Check.Exception(expression.Type == UtilConstants.GuidType, "Not Support new Guid(), Use Guid.New()");
            switch (parameter.Context.ResolveType)
            {
                case ResolveExpressType.WhereSingle:
                    Check.ThrowNotSupportedException(expression.ToString());
                    break;
                case ResolveExpressType.WhereMultiple:
                    Check.ThrowNotSupportedException(expression.ToString());
                    break;
                case ResolveExpressType.SelectSingle:
                    Check.Exception(expression.Type == UtilConstants.DateType, "ThrowNotSupportedException {0} ",expression.ToString());
                    Select(expression, parameter, true);
                    break;
                case ResolveExpressType.SelectMultiple:
                    Check.Exception(expression.Type == UtilConstants.DateType, "ThrowNotSupportedException {0} ", expression.ToString());
                    Select(expression, parameter, false);
                    break;
                case ResolveExpressType.FieldSingle:
                    Check.ThrowNotSupportedException(expression.ToString());
                    break;
                case ResolveExpressType.FieldMultiple:
                case ResolveExpressType.ArrayMultiple:
                case ResolveExpressType.ArraySingle:
                    foreach (var item in expression.Arguments)
                    {
                        base.Expression = item;
                        base.Start();
                    }
                    break;
                default:
                    break;
            }
        }

        private void Select(NewExpression expression, ExpressionParameter parameter, bool isSingle)
        {
            if (expression.Arguments != null)
            {
                var i = 0;
                foreach (var item in expression.Arguments)
                {
                    var memberName = expression.Members[i].Name;
                    ++i;
                    ResolveNewExpressions(parameter, item, memberName);
                }
            }
        }
    }
}