#pragma once

#include "gp/containers/array.hpp"

namespace gp {

    template<typename T, size_t cap>
    class dynarray {
        struct build_order{};

        struct v_element{
            char data[sizeof(T)];

            operator T&() {
                return *(T*)data;
            }

            v_element()
            : data{}
            {}

            template<typename ...Args>
            v_element(build_order, Args&&... argv) {
                new(data) T(gp::forward<Args>(argv)...);
            }

            template<typename arg>
            T& operator=(arg& argv) {
                return *(T*)data = argv;
            }

            template<typename arg>
            T& operator=(arg&& argv) {
                return *(T*)data = gp::forward<arg>(argv);
            }

            template<typename ...Args>
            void build(Args&&... argv) {
                new(data) T(gp::forward<Args>(argv)...);
            }

            T& value() {
                return *(T*)data;
            }

            T& value() const {
                return *(T*)data;
            }

            void clear(){
                ((T*)data)->~T();
            }
        };

		using associated_iterator = pointer_iterator<T, 1>;
		using associated_const_iterator = const_pointer_iterator<T, 1>;
		using associated_riterator = pointer_iterator<T, -1>;
		using associated_const_riterator = const_pointer_iterator<T, -1>;

        v_element data[cap];
        size_t sz = 0;

    public:
        dynarray() = default;

        dynarray(dynarray& oth)
        {
            for(auto& ref : oth) {
                push_back(ref);
            }
        }

        dynarray(dynarray&& oth)
        {
            for(auto& ref : oth) {
                emplace_back(gp::move(ref));
            }
            oth.sz = 0;
        }

        dynarray& operator=(const dynarray& oth) {
            for(auto& self : data) {
                self.clear();
            }
            sz = 0;
            for(auto& ref : oth) {
                push_back(ref);
            }
            return *this;
        }

        dynarray& operator=(dynarray&& oth) {
            for(auto& self : data) {
                self.clear();
            }
            sz = 0;
            for(auto& ref : oth) {
                emplace_back(gp::forward<T>(ref));
            }
            oth.sz = 0;
            return *this;
        }

		constexpr associated_iterator begin()
		{
			return associated_iterator((T*)&data[0]);
		}

		constexpr associated_iterator end()
		{
			return associated_iterator((T*)&data[sz]);
		}

		constexpr const associated_iterator begin() const
		{
			return associated_iterator((T*)&data[0]);
		}

		constexpr const associated_iterator end() const
		{
			return associated_iterator((T*)&data[sz]);
		}

		constexpr associated_const_iterator cbegin() const
		{
			return associated_const_iterator((T*)&data[0]);
		}

		constexpr associated_const_iterator cend() const
		{
			return associated_const_iterator((T*)&data[sz]);
		}

		constexpr associated_riterator rbegin()
		{
			return associated_riterator((T*)&data[sz-1]);
		}

		constexpr associated_riterator rend()
		{
			return associated_riterator((T*)data-1);
		}

		constexpr associated_const_riterator crbegin() const
		{
			return associated_const_riterator((T*)&data[sz-1]);
		}

		constexpr associated_const_riterator crend() const
		{
			return associated_const_riterator((T*)data-1);
		}

		constexpr bool operator==(const dynarray& oth) const
		{
            if(size() != oth.size()) return false;
			for(size_t idx = 0; idx<sz; idx++)
			{
				if(data[idx].value() != oth.data[idx].value())
				{
					return false;
				}
			}
			return true;
		}

		constexpr bool operator!=(const dynarray& oth) const
		{
			return !(*this == oth);
		}

        size_t size() const {
            return sz;
        }

        constexpr size_t capacity() const {
            return cap;
        }

        T& operator[] (size_t idx) {
            return data[idx];
        }

        const T& operator[] (size_t idx) const {
            return data[idx];
        }

        void push_back(T& value) {
            data[sz].build(value);
            ++sz;
        }

        void push_back(T&& value) {
            data[sz].build(value);
            ++sz;
        }

        template<typename ...Args>
        void emplace_back(Args&&... argv) {
            data[sz].build(gp::forward<Args>(argv)...);
            ++sz;
        }

        void remove_back() {
            --sz;
            data[sz].clear();
        }

		gp::buffer<T> as_buffer()
		{
			return gp::buffer<T>{(T*)data, (T*)data+sz};
		}

        ~dynarray() {
            auto it = data;
            auto end = data + size();
            while(it != end) {
                (*it).clear();
                ++it;
            }
        }
    };

}