// /**
//  * File: ManagedObjectDescriptor.cs
//  * Author: haraldwolff
//  *
//  * This file and it's content is copyrighted by the Author and / or copyright holder.
//  * Any use wihtout proper permission is illegal and may lead to legal actions.
//  *
//  *
//  **/
using System;
using System.Reflection;
using ln.json;
using ln.types.net;
namespace ln.manage
{
    public class ManagedObjectPropertyDescriptor
    {
        public ManagedObjectProvider Provider { get; }
        public Type ManagedType => Provider.ManagedType;

        public string PropertyName { get; }
        public Type PropertyType { get; }

        public bool ReadOnly { get; }
        public string LookupPath { get; }

        Action<object, object> setter;
        Func<object, object> getter;

        public ManagedObjectPropertyDescriptor(ManagedObjectProvider objectProvider, string propertyName, Type propertyType, bool readOnly, string lookupPath, Func<object, object> getter, Action<object, object> setter)
        {
            Provider = objectProvider;
            PropertyName = propertyName;
            PropertyType = propertyType;
            ReadOnly = readOnly;
            LookupPath = lookupPath;

            this.getter = getter;
            this.setter = setter;
        }
        public ManagedObjectPropertyDescriptor(ManagedObjectProvider objectProvider,string propertyName,Type propertyType,bool readOnly,string lookupPath)
            :this(objectProvider,propertyName,propertyType,readOnly,lookupPath,null,null)
        {}
        public ManagedObjectPropertyDescriptor(ManagedObjectProvider objectProvider, FieldInfo fieldInfo, string lookupPath)
            : this(objectProvider, fieldInfo.Name, fieldInfo.FieldType, fieldInfo.IsInitOnly, lookupPath, fieldInfo.GetValue, fieldInfo.SetValue)
        {}
        public ManagedObjectPropertyDescriptor(ManagedObjectProvider objectProvider, FieldInfo fieldInfo)
            : this(objectProvider, fieldInfo, null)
        {}
        public ManagedObjectPropertyDescriptor(ManagedObjectProvider objectProvider, PropertyInfo propertyInfo, string lookupPath)
            : this(objectProvider, propertyInfo.Name, propertyInfo.PropertyType, !propertyInfo.CanWrite, lookupPath, propertyInfo.GetValue, propertyInfo.SetValue)
        {}
        public ManagedObjectPropertyDescriptor(ManagedObjectProvider objectProvider, PropertyInfo propertyInfo)
            : this(objectProvider, propertyInfo, null)
        {}

        public void SetValue(object managedObject, object value) => setter(managedObject, value);
        public object GetValue(object managedObject) => getter(managedObject);

        public JSONObject CreateJsonDescriptor()
        {
                JSONObject descriptor = new JSONObject();

            descriptor["name"] = PropertyName;
            descriptor["readonly"] = ReadOnly;

            if (typeof(string).Equals(PropertyType))
            {
                descriptor["type"] = "string";
            }
            else if (typeof(int).Equals(PropertyType))
            {
                descriptor["type"] = "int";
            }
            else if (typeof(double).Equals(PropertyType))
            {
                descriptor["type"] = "double";
            }
            else if (typeof(IPv4).Equals(PropertyType))
            {
                descriptor["type"] = "ip4";
            }
            else if (typeof(IPv6).Equals(PropertyType))
            {
                descriptor["type"] = "ip6";
            }
            else if (typeof(MAC).Equals(PropertyType))
            {
                descriptor["type"] = "mac";
            }
            else if (PropertyType.IsEnum)
            {
                if (PropertyType.GetCustomAttribute<FlagsAttribute>() != null)
                {
                    JSONObject type = new JSONObject();
                    string[] names = Enum.GetNames(PropertyType);
                    int[] values = (int[])Enum.GetValues(PropertyType);
                    for (int n = 0; n < names.Length; n++)
                        type[names[n]] = values[n];
                    descriptor["type"] = type;
                }
                else
                {
                    JSONArray type = new JSONArray();
                    string[] symbols = Enum.GetNames(PropertyType);
                    foreach (string symbol in symbols)
                        type.Add(symbol);
                    descriptor["type"] = type;
                }
            }
            else if (LookupPath != null)
            {
                // ToDo: Implement Referenced Objects
                throw new NotImplementedException();
            }
            else
            {
                throw new NotSupportedException();
            }




            return descriptor;
        }


    }
}