using System;
using IwbZero.Expr;
using IwbZero.ToolCommon.StringModel;

namespace IwbZero.ExprFunctions.Functions
{
    /// <summary>
    /// 获取日期（年-01-01）
    /// </summary>
    public class FunGetFdy:IIwbFunction
    {
        public string Invoke(ExprObject exprObj)
        {
            DateTime dateTime = DateTime.Now;
            int num = dateTime.Year;
            ExprObject child = exprObj.GetChild(0);
            if (child != null)
            {
                ExprTypes exprTypes = EvalExpr.GetExprTypes(child);
                if (exprTypes == ExprTypes.Integer || exprTypes == ExprTypes.Decimal)
                {
                    num = child.Expr.ValI();
                }
                else
                {
                    dateTime = child.Expr.StrToDt();
                    num = dateTime.Year;
                }
            }

            return $"{num}-01-01";
        }
    }
}