#pragma once
#include "field.h"
#include "view.h"
#include "meta.h"
#include "convert.h"
namespace refl {
	enum ClassFlag :uint32_t {
		CLASS_NONE_FLAG = 0,
		CLASS_TRIVIAL_FLAG = 1 << 0,
		CLASS_POINTER_FLAG = 1 << 1,
		CLASS_ARRAY_FLAG   = 1 << 2,
	};
	using enum ClassFlag;
	enum EFieldFind :uint32_t {
		FIND_ALL_FIELD = 0,
		FIND_ALL_MEMBER,
		FIND_ALL_METHOD,
		FIND_FIELD,
		FIND_CTOR,
		FIND_MEMBER,
		FIND_METHOD,
		FIND_METHODS,//函数重载 特别是构造函数
	};
	struct vtable_uclass
	{
		//class
		const sarray<const FieldPtr> (*GetFields)(const UClass*, EFieldFind find, const Name& name);
		//function
		sarray<const UClass*>(*GetParams)(const UClass*);
		//function
		void (*Call)(const FieldPtr*, const sarray<Any>& ArgsList);
		//meta
		const UClass* (*GetMeta)(const Name&);
		//object
		bool (*CtorObject)(void* ptr,const UClass* cls, const sarray<Any>& ArgsList);
		bool (*DestObject)(void*);
	};
	class UClass{
	public:
		Name name;
		uint32_t size;
		uint32_t flag{0};
		const UClass* parent;
		vtable_uclass vtable{};
	public:
		constexpr UClass(std::string_view name, uint32_t size, const UClass* parent = nullptr)
			:name(name), size(size), parent(parent){}
		AnyView New(void* ptr = nullptr, const sarray<Any>& ArgsList = {}) const {
			if (ptr == nullptr) {
				ptr = malloc(size);
				CtorObject(ptr, ArgsList);
			}
			return { ptr , this };
		}
		template<typename T>
		T* New(T* ptr = nullptr, const sarray<Any>& ArgsList = {}) const{
			if (!IsChildOf<T>()) {
				return nullptr;
			}
			if (ptr == nullptr) {
				ptr = (T*)malloc(size);
			}
			CtorObject(ptr, ArgsList);
			return ptr;
		}
		bool IsChildOf(const UClass* cls) const {
			const UClass* _parent = parent;
			while (_parent != nullptr) {
				if (_parent == cls) {
					return true;
				}
				_parent = _parent->parent;
			}
			return false;
		}
		template<typename T>
		bool IsChildOf(bool bthis = false) const {
			return IsChildOf(&TypeInfo<T>::StaticClass);
		}
	public:
		const sarray<const FieldPtr> GetFields(EFieldFind find, const Name& name)const {
			if (vtable.GetFields) {
				return vtable.GetFields(this, find, name);
			}
			return {};
		}
		bool CtorObject(void* ptr, const sarray<Any>& ArgsList = {})const {
			if (vtable.CtorObject) {
				if (vtable.CtorObject(ptr, this, ArgsList)) {
					return true;
				}
				auto& fieldList = GetFields(EFieldFind::FIND_CTOR, FName("Ctor"));
				if (fieldList.empty()) {
					return false;
				}
				if (fieldList.size() == 1) {
					return fieldList[0]->Invoke(ArgsList);
				}
				for (auto& field : fieldList) {
					if (field.Invokes(ArgsList)) {
						return true;
					}
				}
				return false;
			}
			memset(ptr, 0, size);
			return true;
		}
		void DestObject(void* ptr)const {
			if (vtable.DestObject) {
				vtable.DestObject(ptr);
			}
		}
	public:
		template<typename T>
		static bool CtorObject(void* ptr, const UClass* cls, const sarray<Any>& ArgsList = {}) {
			int size = ArgsList.size();
			if (size == 0) {
				if constexpr (std::is_trivially_constructible_v<T>) {
					std::construct_at((T*)ptr);
					return true;
				}
				else {
					throw "refl::error:: no default construct function!!!";
				}
			}
			if (size == 1 && ArgsList[0]->Check(cls)) {
				*(T*)ptr = *(const T*)ArgsList[0]->ptr;
				return true;
			}
			return false;
		}
	};
}