using System;
using System.Collections.Generic;
using AlicizaX.Runtime;

namespace AlicizaX.UI.Runtime
{
    public static class MetaTypeCache<T> where T : UIBase
    {
        public static readonly UIMetadata Metadata;

        static MetaTypeCache()
        {
            var type = typeof(T);
            Metadata = type.IsSubclassOf(typeof(UIWidget))
                ? UIMetadataFactory.GetWidgetInfo(type.TypeHandle)
                : UIMetadataFactory.GetWindowInfo(type.TypeHandle);
        }
    }

    internal static class UIMetadataFactory
    {
        private static readonly Dictionary<RuntimeTypeHandle, UIMetadata> UIWindowMetadata = new();
        private static readonly Dictionary<RuntimeTypeHandle, UIMetadata> UIWidgetMetadata = new();


        internal static UIMetadata GetWindowInfo(RuntimeTypeHandle handle)
        {
            if (!UIWindowMetadata.TryGetValue(handle, out var meta))
            {
                meta = GetWindowAttributeInfo(Type.GetTypeFromHandle(handle));
                UIWindowMetadata[handle] = meta;
            }

            return meta;
        }

        internal static UIMetadata GetWidgetInfo(RuntimeTypeHandle handle)
        {
            if (!UIWidgetMetadata.TryGetValue(handle, out var meta))
            {
                meta = CreateWidgetMetadata(Type.GetTypeFromHandle(handle));
                UIWidgetMetadata[handle] = meta;
            }

            return meta;
        }

        private static UIMetadata CreateWidgetMetadata(Type type)
        {
            if (!type.IsSubclassOf(typeof(UIWidget)))
                throw new InvalidOperationException($"Invalid type: {type.Name}");

            return new UIMetadata(type);
        }

        private static UIMetadata GetWindowAttributeInfo(Type uiType)
        {
            if (!uiType.IsSubclassOf(typeof(UIWindow)))
                throw new InvalidOperationException($" {uiType.FullName} not SubClass Of UIWindow");

            WindowAttribute windowAttribute = Attribute.GetCustomAttribute(uiType, typeof(WindowAttribute)) as WindowAttribute;

            if (windowAttribute == null)
                throw new GameFrameworkException($"Window {uiType.FullName} WindowAttribute can be null.");


            return new UIMetadata(uiType, windowAttribute.WindowLayer, windowAttribute.FullScreen, windowAttribute.CacheTime);
        }
    }
}