using System.Collections;

using IwbZero.ToolCommon.StringModel;

namespace IwbZero.Expr
{
    public class ExprObject
    {
        // Fields

        // Methods
        public ExprObject(string pcExpr)
        {
            Expr = "";
            Value = "";
            ChildNodes = new ArrayList();
            Expr = pcExpr;
            ElementType = ExprElements.Expression;
        }

        public ExprObject(string pcExpr, ExprElements poElementType)
        {
            Expr = "";
            Value = "";
            ChildNodes = new ArrayList();
            Expr = pcExpr;
            ElementType = poElementType;
        }

        public void AddChild(ExprObject poNode)
        {
            ChildNodes.Add(poNode);
        }

        public ExprObject Clone()
        {
            ExprObject exprObject = new ExprObject(Expr, ElementType);
            foreach (ExprObject expr2 in ChildNodes)
            {
                exprObject.ChildNodes.Add(expr2.Clone());
            }
            return exprObject;
        }

        public bool ContainOp(string pcOpId)
        {
            for (int i = 0; i < ChildCount; i++)
            {
                ExprOperator @operator = GetChild(i).GetOperator();
                if ((@operator != null) && (@operator.Id.UAndT() == pcOpId.UAndT()))
                {
                    return true;
                }
            }
            return false;
        }

        public ExprObject GetChild(int piIndex)
        {
            ExprObject exprObject = null;
            if ((piIndex >= 0) && (piIndex < ChildNodes.Count))
            {
                exprObject = (ExprObject)ChildNodes[piIndex];
            }
            return exprObject;
        }

        public ExprOperator GetOperator()
        {
            ExprOperator @operator = null;
            if (ElementType == ExprElements.Operator)
            {
                @operator = (ExprOperator)EvalExpr.Operators[Expr];
            }
            return @operator;
        }

        public void InsertChildAt(ExprObject poNode, int piIndex)
        {
            ChildNodes.Insert(piIndex, poNode);
        }

        public void RemoveChildAt(int piIndex)
        {
            ChildNodes.RemoveAt(piIndex);
        }

        public override string ToString()
        {
            return (ElementType.ToString() + "---" + Expr);
        }

        public int ChildCount => ChildNodes.Count;

        public ArrayList ChildNodes { get; }

        public ExprElements ElementType { get; set; }

        public string Expr { get; set; }

        public bool IsOperator => (GetOperator() != null);

        public string Value { get; set; }
    }
}