#pragma once

#include <gp/buffer.hpp>

#include <initializer_list>

namespace gp{
	struct zero_t{};

	template<typename T, std::size_t sz>
	class array{
	public:
		T ary[sz];
		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>;

		array() 
		: ary()
		{}

		array(const array& oth)
		{
			auto it_l = begin();
			auto it_o = oth.cbegin();
			for(size_t i = 0; i < sz; ++i)
			{
				new(&*(it_l++)) T(*(it_o++));
			}
		}

		template<typename fn>
		array(fn& func) 
		{
			for(auto& elem : ary) {
				elem = fn();
			}
		}

		constexpr array(zero_t) 
		{
			for(auto& elem : ary) {
				elem = 0;
			}
		}

		template<typename ...U>
		constexpr array(U&& ...values)
		: ary{gp::move((T&&)values)...}
		{}

		array(array&& values)
		{
			gp::move_uninitialized(
				values,
				*this
			);
		}

		constexpr array(T (& oth)[sz]) {
			gp::move_uninitialized<T>(
				gp::nameless_range<int*>(oth, oth+sz),
				gp::nameless_range<associated_iterator>(begin(), end())
			);
		}

		constexpr array(T (&& oth)[sz]) {
			gp::move_uninitialized(
				gp::nameless_range<int*>((T*)oth, (T*)oth+sz),
				gp::nameless_range<associated_iterator>(begin(), end())
			);
		}

		array& operator=(array& oth)
		{
			for(size_t i = 0; i < sz; ++i)
			{
				ary[i]=oth[i];
			}
			return *this;
		}

		array& operator=(array&& oth)
		{
			for(size_t i = 0; i < sz; ++i)
			{
				ary[i]=gp::move(oth[i]);
			}
			return *this;
		}

		constexpr T& operator[] (size_t off)
		{
			if constexpr (gp_config::has_buffer_bounds)
			{
				gp_config::assertion(
					off < sz,
					"Array bounds infringed"
				);
			}
			return ary[off];
		}

		constexpr const T& operator[] (size_t off) const
		{
			return ary[off];
		}

		constexpr size_t size() const
		{
			return sz;
		}

		constexpr pointer_iterator<T, 1> begin()
		{
			return associated_iterator(&ary[0]);
		}

		constexpr pointer_iterator<T, 1> end()
		{
			return associated_iterator(&ary[sz]);
		}

		constexpr const_pointer_iterator<T, 1> cbegin() const
		{
			return associated_const_iterator(&ary[0]);
		}

		constexpr const_pointer_iterator<T, 1> cend() const
		{
			return associated_const_iterator(&ary[sz]);
		}

		constexpr pointer_iterator<T, -1> rbegin()
		{
			return associated_riterator(&ary[sz-1]);
		}

		constexpr pointer_iterator<T, -1> rend()
		{
			return associated_riterator(ary-1);
		}

		constexpr const_pointer_iterator<T, -1> crbegin() const
		{
			return associated_const_riterator(&ary[sz-1]);
		}

		constexpr const_pointer_iterator<T, -1> crend() const
		{
			return associated_const_riterator(ary-1);
		}

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

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

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