AQuery/server/table.h

// TODO: Replace `cout, printf` with sprintf&fputs and custom buffers

#ifndef _TABLE_H
#define _TABLE_H

#include "types.h"
#include "vector_type.hpp"
#include <iostream>
#include <string>
#include "io.h"
template <typename T>
class vector_type;
template <>
class vector_type<void>;

#ifdef _MSC_VER
namespace types {
	enum Type_t;
	template <typename T>
	struct Types;
	template <class T1, class T2>
	struct Coercion;
}
#endif
template<typename _Ty>
class ColView;
template<typename _Ty>
class ColRef : public vector_type<_Ty>
{
public:
	typedef ColRef<_Ty> Decayed_t;
	const char* name;
	types::Type_t ty = types::ERROR;
	ColRef() : vector_type<_Ty>(0), name("") {}
	ColRef(const uint32_t& size, const char* name = "") : vector_type<_Ty>(size), name(name) {}
	ColRef(const char* name) : name(name) {}
	void init() { ty = types::Types<_Ty>::getType();  this->size = this->capacity = 0; this->container = 0; }
	ColRef(const char* name, types::Type_t ty) : name(name), ty(ty) {}
	using vector_type<_Ty>::operator[];
	using vector_type<_Ty>::operator=;
	ColView<_Ty> operator [](const vector_type<uint32_t>&idxs) const {
		return ColView<_Ty>(*this, idxs);
	}

	void out(uint32_t n = 4, const char* sep = " ") const {
		n = n > this->size ? this->size : n;
		std::cout << '(';
			for (uint32_t i = 0; i < n; ++i)
				std::cout << this->operator[](i) << sep;
		std::cout << ')';
	}
	template<typename T>
	ColRef<T> scast();
};

template<typename _Ty>
class ColView {
public: 
	typedef ColRef<_Ty> Decayed_t;
	const vector_type<uint32_t>& idxs;
	const ColRef<_Ty>& orig;
	const uint32_t& size;
	ColView(const ColRef<_Ty>& orig, const vector_type<uint32_t>& idxs) : orig(orig), idxs(idxs), size(idxs.size) {}
	ColView(const ColView<_Ty>& orig, const vector_type<uint32_t>& idxs) : orig(orig.orig), idxs(idxs), size(idxs.size) {
		for (uint32_t i = 0; i < size; ++i) 
			idxs[i] = orig.idxs[idxs[i]];
	}
	_Ty& operator [](const uint32_t& i) const {
		return orig[idxs[i]];
	}
	struct Iterator_t {
		const uint32_t* val;
		const ColRef<_Ty>& orig;
		constexpr Iterator_t(const uint32_t* val, const ColRef<_Ty>& orig) noexcept : val(val), orig(orig) {}
		_Ty& operator*() { return orig[*val]; }
		bool operator != (const Iterator_t& rhs) { return rhs.val != val; }
		Iterator_t& operator++ () {
			++val;
			return *this;
		}
		Iterator_t operator++ (int) {
			Iterator_t tmp = *this;
			++val;
			return tmp;
		}
	};
	Iterator_t begin() const {
		return Iterator_t(idxs.begin(), orig);
	}
	Iterator_t end() const {
		return Iterator_t(idxs.end(), orig);
	}
	void out(uint32_t n = 4, const char* sep = " ") const {
		n = n > size ? size : n;
		std::cout<<'(';
		for (uint32_t i = 0; i < n; ++i) 
			std::cout << this->operator[](i)<< sep;
		std::cout << ')';
	}
};
template <template <class...> class VT, class T>
std::ostream& operator<<(std::ostream& os, const VT<T>& v)
{
	v.out();
	return os;
}
template <class Type>
struct decayed_impl<ColView, Type> { typedef ColRef<Type> type; };
template<typename _Ty>
template<typename T>
inline ColRef<T> ColRef<_Ty>::scast()
{
	this->ty = types::Types<T>::getType();
	return *(ColRef<T> *)this;
}
using uColRef = ColRef<void>;

template<class ...Types> struct TableInfo;
template<class ...Types> struct TableView;

template <long long _Index, bool order = true, class... _Types>
constexpr inline auto& get(const TableInfo<_Types...>& table) noexcept {
	if constexpr (order)
		return *(ColRef<std::tuple_element_t<_Index, std::tuple<_Types...>>> *) & (table.colrefs[_Index]);
	else 
		return *(ColRef<std::tuple_element_t<-1-_Index, std::tuple<_Types...>>> *) & (table.colrefs[-1-_Index]);
}

template <long long _Index, class... _Types>
constexpr inline ColRef<std::tuple_element_t<_Index, std::tuple<_Types...>>>& get(const TableView<_Types...>& table) noexcept {
	return *(ColRef<std::tuple_element_t<_Index, std::tuple<_Types...>>> *) & (table.info.colrefs[_Index]);
}
template <class T>
struct is_vector_impl : std::false_type {};
template <class V>
struct is_vector_impl<ColRef<V>> : std::true_type {};
template <class V>
struct is_vector_impl<ColView<V>> : std::true_type {};
template <class V>
struct is_vector_impl<vector_type<V>> : std::true_type {};
template <class T>
constexpr static bool is_vector_type = is_vector_impl<T>::value;

template<class ...Types>
struct TableView;
template<class ...Types>
struct TableInfo {
	const char* name;
	ColRef<void>* colrefs;
	uint32_t n_cols;
	typedef std::tuple<Types...> tuple_type;
	void print(const char* __restrict sep, const char* __restrict end) const;
	template <size_t j = 0>
	typename std::enable_if<j == sizeof...(Types) - 1, void>::type print_impl(const uint32_t& i, const char* __restrict sep = " ") const;
	template <size_t j = 0>
	typename std::enable_if<j < sizeof...(Types) - 1, void>::type print_impl(const uint32_t& i, const char* __restrict sep = " ") const;
	template <size_t ...Idxs>
	struct GetTypes {
		typedef typename std::tuple<typename std::tuple_element<Idxs, tuple_type>::type ...> type;
	};
	template <size_t ...Idxs>
	using getRecordType = typename GetTypes<Idxs...>::type;
	TableInfo(const char* name, uint32_t n_cols);
	template <int prog = 0>
	inline void materialize(const vector_type<uint32_t>& idxs, TableInfo<Types...>* tbl = nullptr) { // inplace materialize
		if constexpr(prog == 0) tbl = 0 ? this : tbl;
		if constexpr (prog == sizeof...(Types)) return;
		else {
			auto& col = get<prog>(*this);
			auto new_col = decays<decltype(col)>{idxs.size};
			for(uint32_t i = 0; i < idxs.size; ++i)
				new_col[i] = col[idxs[i]];
			get<prog>(*tbl) = new_col;
			materialize<prog + 1>();
		}
	}
	inline TableInfo<Types...>* materialize_copy(const vector_type<uint32_t>& idxs) { 
		auto tbl = new TableInfo<Types...>(this->name, sizeof...(Types));
		materialize<0>(idxs, tbl);
		return tbl;
	}
	template<int ...cols>
	inline vector_type<uint32_t>* order_by() {
		vector_type<uint32_t>* ord = new vector_type<uint32_t>(colrefs[0].size);
		for (uint32_t i = 0; i < colrefs[0].size; ++i)
			(*ord)[i] = i;
		std::sort(ord->begin(), ord->end(), [this](const uint32_t& lhs, const uint32_t& rhs) {
			return
				std::forward_as_tuple((cols >= 0 ? get<cols, (cols >= 0)>(*this)[lhs] : -get<cols, (cols >= 0)>(*this)[lhs]) ...)
				<
				std::forward_as_tuple((cols >= 0 ? get<cols, (cols >= 0)>(*this)[rhs] : -get<cols, (cols >= 0)>(*this)[rhs]) ...);
			});
		return ord;
	}
	template <int ...cols>
	auto order_by_view () {
		return TableView<Types...>(order_by<cols...>(), *this);
	}
	template <int col, int ...rem_cols, class Fn, class ...__Types> 
	inline void print2_impl(Fn func, const uint32_t& i, const __Types& ... args) const {
		using this_type = typename std::tuple_element<col, tuple_type>::type;
		const auto& this_value = get<col>(*this)[i];
		const auto& next = [&](auto &v) {
			if constexpr (sizeof...(rem_cols) == 0)
				func(args..., v);
			else
				print2_impl<rem_cols...>(func, i, args ..., v);
		};
		if constexpr (is_vector_type<this_type>)
			for (int j = 0; j < this_value.size; ++j)
				next(this_value[j]);
		else
			next(this_value);
	}
	template <int ...cols>
	void print2(const char* __restrict sep = ",", const char* __restrict end = "\n",
		const vector_type<uint32_t>* __restrict view = nullptr, FILE* __restrict fp = nullptr) const {
		std::string printf_string =
			generate_printf_string<typename std::tuple_element<cols, tuple_type>::type ...>(sep, end);
		const auto& prt_loop = [&fp, &view, &printf_string, *this](const auto& f) {
			if(view)
				for (int i = 0; i < view->size; ++i)
					print2_impl<cols...>(f, (*view)[i], printf_string.c_str());
			else
				for (int i = 0; i < colrefs[0].size; ++i)
					print2_impl<cols...>(f, i, printf_string.c_str());
		};
		if (fp)
			prt_loop([&fp](auto... args) { fprintf(fp, args...); });
		else
			prt_loop(printf);
	}
	template <int ...vals> struct applier {
	inline constexpr static void apply(const TableInfo<Types...>& t, const char* __restrict sep = ",", const char* __restrict end = "\n",
		const vector_type<uint32_t>* __restrict view = nullptr, FILE* __restrict fp = nullptr)
	{ t.template print2<vals ...>(sep, end, view, fp); }};
	
	inline void printall(const char* __restrict sep = ",", const char* __restrict end = "\n",
		const vector_type<uint32_t>* __restrict view = nullptr, FILE* __restrict fp = nullptr) {
		applyIntegerSequence<sizeof...(Types), applier>::apply(*this, sep, end, view, fp);
	}
};


template<class ...Types>
struct TableView {
	const vector_type<uint32_t>* idxs;
	const TableInfo<Types...>& info;
	constexpr TableView(const vector_type<uint32_t>* idxs, const TableInfo<Types...>& info) noexcept : idxs(idxs), info(info) {}
	void print(const char* __restrict sep, const char* __restrict end) const;
	template <size_t j = 0>
	typename std::enable_if<j == sizeof...(Types) - 1, void>::type print_impl(const uint32_t& i, const char* __restrict sep = " ") const;
	template <size_t j = 0>
	typename std::enable_if < j < sizeof...(Types) - 1, void>::type print_impl(const uint32_t& i, const char* __restrict sep = " ") const;
	
	~TableView() {
		delete idxs;
	}
};
template <class T>
constexpr static inline bool is_vector(const ColRef<T>&) {
	return true;
}
template <class T>
constexpr static inline bool is_vector(const vector_type<T>&) {
	return true;
}
template <class T>
constexpr static inline bool is_vector(const T&) {
	return false;
}



template<class ...Types>
TableInfo<Types...>::TableInfo(const char* name, uint32_t n_cols) : name(name), n_cols(n_cols) {
	this->colrefs = (ColRef<void>*)malloc(sizeof(ColRef<void>) * n_cols);
}
template <class ...Types>
template <size_t j>
inline typename std::enable_if<j == sizeof...(Types) - 1, void>::type
TableView<Types ...>::print_impl(const uint32_t& i, const char* __restrict sep) const {
	std::cout << (get<j>(*this))[(*idxs)[i]];
}

template<class ...Types>
template<size_t j>
inline typename std::enable_if < j < sizeof...(Types) - 1, void>::type
	TableView<Types...>::print_impl(const uint32_t& i, const char* __restrict sep) const
{
	std::cout << (get<j>(*this))[(*idxs)[i]] << sep;
	print_impl<j + 1>(i, sep);
}

template<class ...Types>
inline void TableView<Types...>::print(const char* __restrict sep, const char* __restrict end) const {
	int n_rows = 0;
	if (info.colrefs[0].size > 0)
		n_rows = info.colrefs[0].size;
	for (int i = 0; i < n_rows; ++i) {
		print_impl(i);
		std::cout << end;
	}
}
template <class ...Types>
template <size_t j>
inline typename std::enable_if<j == sizeof...(Types) - 1, void>::type
	TableInfo<Types ...>::print_impl(const uint32_t& i, const char* __restrict sep) const {
	std::cout << (get<j>(*this))[i];
}

template<class ...Types>
template<size_t j>
inline typename std::enable_if<j < sizeof...(Types) - 1, void>::type 
	TableInfo<Types...>::print_impl(const uint32_t& i, const char* __restrict sep) const
{
	std::cout << (get<j>(*this))[i] << sep;
	print_impl<j+1>(i, sep);
}

template<class ...Types>
inline void TableInfo<Types...>::print(const char* __restrict sep, const char* __restrict end) const {
	int n_rows = 0;
	if (n_cols > 0 && colrefs[0].size > 0)
		n_rows = colrefs[0].size;
	for (int i = 0; i < n_rows; ++i) {
		print_impl(i);
		std::cout << end;
	}
}
template <class T1, class T2, template<typename ...> class VT>
VT<typename types::Coercion<T1, T2>::type> operator -(const VT<T1>& lhs, const VT<T2>& rhs) {
	auto ret = VT<typename types::Coercion<T1, T2>::type>(lhs.size, "");
	for (int i = 0; i < lhs.size; ++i)
		ret.container[i] = lhs.container[i] - rhs.container[i];
	return ret;
}
template <class T1, class T2, template<typename ...> class VT>
VT<typename types::Coercion<T1, T2>::type> operator -(const VT<T1>& lhs, const T2& rhs) {
	auto ret = VT<typename types::Coercion<T1, T2>::type>(lhs.size, "");
	for (int i = 0; i < lhs.size; ++i)
		ret.container[i] = lhs.container[i] - rhs;
	return ret;
}
template <class T1, class T2, template<typename ...> class VT>
VT<typename types::Coercion<T1, T2>::type> operator +(const VT<T1>& lhs, const VT<T2>& rhs) {
	auto ret = VT<typename types::Coercion<T1, T2>::type>(lhs.size, "");
	for (int i = 0; i < lhs.size; ++i)
		ret.container[i] = lhs.container[i] + rhs.container[i];
	return ret;
}
template <class T1, class T2, template<typename ...> class VT>
VT<typename types::Coercion<T1, T2>::type> operator +(const VT<T1>& lhs, const T2& rhs) {
	auto ret = VT<typename types::Coercion<T1, T2>::type>(lhs.size, "");
	for (int i = 0; i < lhs.size; ++i)
		ret.container[i] = lhs.container[i] + rhs;
	return ret;
}
template <class T1, class T2, template<typename ...> class VT>
VT<typename types::Coercion<T1, T2>::type> operator *(const VT<T1>& lhs, const VT<T2>& rhs) {
	auto ret = VT<typename types::Coercion<T1, T2>::type>(lhs.size, "");
	for (int i = 0; i < lhs.size; ++i)
		ret.container[i] = lhs.container[i] * rhs.container[i];
	return ret;
}
template <class T1, class T2, template<typename ...> class VT>
VT<typename types::Coercion<T1, T2>::type> operator *(const VT<T1>& lhs, const T2& rhs) {
	auto ret = VT<typename types::Coercion<T1, T2>::type>(lhs.size, "");
	for (int i = 0; i < lhs.size; ++i)
		ret.container[i] = lhs.container[i] * rhs;
	return ret;
}
template <class T1, class T2, template<typename ...> class VT>
VT<typename types::Coercion<T1, T2>::type> operator /(const VT<T1>& lhs, const VT<T2>& rhs) {
	auto ret = VT<typename types::Coercion<T1, T2>::type>(lhs.size, "");
	for (int i = 0; i < lhs.size; ++i)
		ret.container[i] = lhs.container[i] / rhs.container[i];
	return ret;
}
template <class T1, class T2, template<typename ...> class VT>
VT<typename types::Coercion<T1, T2>::type> operator /(const VT<T1>& lhs, const T2& rhs) {
	auto ret = VT<typename types::Coercion<T1, T2>::type>(lhs.size, "");
	for (int i = 0; i < lhs.size; ++i)
		ret.container[i] = lhs.container[i] / rhs;
	return ret;
}

template <class ...Types>
void print(const TableInfo<Types...>& v, const char* delimiter = " ", const char* endline = "\n") {
	v.print(delimiter, endline);
}
template <class ...Types>
void print(const TableView<Types...>& v, const char* delimiter = " ", const char* endline = "\n") {
	v.print(delimiter, endline);
}
template <class T>
void print(const T& v, const char* delimiter = " ") {
	std::cout<< v;
	// printf(types::printf_str[types::Types<T>::getType()], v);
}
template <class T>
void inline print_impl(const T& v, const char* delimiter, const char* endline) {
	for (const auto& vi : v) {
		print(vi);
		std::cout << delimiter;
		// printf("%s", delimiter);
	}
	std::cout << endline;
	//printf("%s", endline);
}

template <class T, template<typename> class VT>
typename std::enable_if<!std::is_same<VT<T>, TableInfo<T>>::value>::type 
print(const VT<T>& v, const char* delimiter = " ", const char* endline = "\n") {
	print_impl(v, delimiter, endline);
}
 
#endif