using System;
using System.Reflection;
using TrueCraft.API.Networking;

namespace TrueCraft.API
{
    public abstract class MetadataEntry
    {
        public abstract byte Identifier { get; }
        public abstract string FriendlyName { get; }

        public abstract void FromStream(IMinecraftStream stream);
        public abstract void WriteTo(IMinecraftStream stream, byte index);

        internal byte Index { get; set; }

        public static implicit operator MetadataEntry(byte value)
        {
            return new MetadataByte(value);
        }

        public static implicit operator MetadataEntry(short value)
        {
            return new MetadataShort(value);
        }

        public static implicit operator MetadataEntry(int value)
        {
            return new MetadataInt(value);
        }

        public static implicit operator MetadataEntry(float value)
        {
            return new MetadataFloat(value);
        }

        public static implicit operator MetadataEntry(string value)
        {
            return new MetadataString(value);
        }

        public static implicit operator MetadataEntry(ItemStack value)
        {
            return new MetadataSlot(value);
        }

        protected byte GetKey(byte index)
        {
            Index = index; // Cheat to get this for ToString
            return (byte)((Identifier << 5) | (index & 0x1F));
        }

        public override string ToString()
        {
            Type type = GetType();
            FieldInfo[] fields = type.GetFields();
            string result = FriendlyName + "[" + Index + "]: ";
            if (fields.Length != 0)
                result += fields[0].GetValue(this).ToString();
            return result;
        }
    }
}