using System;

namespace tlang
{
    public class MemberGetVariableValue : GetVariableValue
    {
        public Node Parent {get;set;}
        public MemberGetVariableValue(Node parent,string text) : base(text)
        {
            Parent = parent;
        }
        public override void SetValue(IScopeEnvironment nodeEnv, TObject value)
        {
            var res=Parent.Execute(nodeEnv);
            var dict = res as TDictionary;
            if(dict != null)
            {
                if(dict.MemberExists($"set{Name}"))
                {
                    var mbm= dict[$"set{Name}"] as ICallable;
                    if(mbm != null)
                    {
                        mbm.Call(value);
                    }
                   
                }else{
                    dict[Name] = value;
                }

            }
        }
        public override TObject Execute(IScopeEnvironment nodeEnv)
        {
            var res=Parent.Execute(nodeEnv);

            var dict = res as TDictionary;
            var integer = res as TNumber;
            var array =  res as TArray;
            var str = res as TString;

            if(array != null)
            {
                if(Name == "length" || Name == "count")
                {
                    return TObject.Number(array.Items.Count);
                }
		if(Name == "ittr")
                {
                    var ittr = TObject.Dictionary();
                    var enumerator=array.Items.GetEnumerator();
                    ittr["getcurrent"] = new TExternalMethod(()=>{
                        return enumerator.Current;
                    });
                    ittr["movenext"] = new TExternalMethod(()=>{
                        return TObject.Boolean(enumerator.MoveNext());
                    });
                    ittr["reset"] = new TExternalMethod(()=>{
                        
                    });
                    ittr["dispose"] = new TExternalMethod(()=>{
                    	enumerator.Dispose();
                    });
                    return ittr;
                }
            }
            if(dict != null)
            {
                if(dict.MemberExists($"get{Name}"))
                {
                    var mbm= dict[$"get{Name}"] as ICallable;
                    if(mbm != null)
                    return mbm.Call();
                }

                if(dict.MemberExists(Name))
                {
                    return dict[Name];
                }

            }

            if(integer != null)
            {
                if(Name == "abs")
                {
                    return TObject.Number(Math.Abs(integer.Value));
                }
                if(Name == "int")
                {
                    return TObject.Number(Math.Round(integer.Value));
                }
            }
            if(str != null)
            {
                
                if(Name == "number")
                {
                    double value;
                    if(double.TryParse(str.Value,out value))
                    {
                        return TObject.Number(value);
                    }
                    return TObject.Null;
                }
                if(Name == "ittr")
                {
                    var ittr = TObject.Dictionary();
                    var enumerator=str.Value.GetEnumerator();
                    ittr["getcurrent"] = new TExternalMethod(()=>{
                        return TObject.Char(enumerator.Current);
                    });
                    ittr["movenext"] = new TExternalMethod(()=>{
                        return TObject.Boolean(enumerator.MoveNext());
                    });
                    ittr["reset"] = new TExternalMethod(()=>{
                        enumerator.Reset();
                    });
                    ittr["dispose"] = new TExternalMethod(()=>{
                    	enumerator.Dispose();
                    });
                    return ittr;
                }
                if(Name == "boolean")
                {
                    return TObject.Boolean(str.Value.ToLower() == "true");
                }
                if(Name == "length" || Name == "count")
                {
                    return TObject.Number(str.Value.Length);
                }
                
            }


            return TObject.Uninit;
        }
    }
}