using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;

namespace Island.StandardLib.Reflection
{
    public class DynamicType
    {
        public Type ClassType { get; private set; }
        Dictionary<string, MethodInfo[]> CachedMethods;
        Dictionary<string, MemberInfo> CachedMembers;

        public DynamicType(Type classType)
        {
            ClassType = classType;
            CachedMethods = new Dictionary<string, MethodInfo[]>();
            CachedMembers = new Dictionary<string, MemberInfo>();
        }

        public MethodInfo[] FindMethod(string methodName)
        {
            if (CachedMethods.TryGetValue(methodName, out MethodInfo[] result)) return result;
            MethodInfo[] methods = (from met in ClassType.GetMethods()
                                    where met.Name == methodName
                                    select met).ToArray();
            if (methods.Length == 0) return methods;
            CachedMethods.Add(methodName, methods);
            return methods;
        }

        public MemberInfo FindMember(string memberName)
        {
            if (CachedMembers.TryGetValue(memberName, out MemberInfo result)) return result;
            MemberInfo[] members = (from meb in ClassType.GetMembers()
                                    where meb.Name == memberName
                                    select meb).ToArray();
            if (members.Length == 0) return null;
            CachedMembers.Add(memberName, members[0]);
            return members[0];
        }
    }
}