/**
	This file is a part of rexy's general purpose library
	Copyright (C) 2022 rexy712

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef REXY_DEBUG_PRINT_HPP
#define REXY_DEBUG_PRINT_HPP

#ifndef REXY_ENABLE_DEBUG_LEVEL
	#define REXY_ENABLE_DEBUG_LEVEL 0
#endif

#ifndef REXY_ENABLE_COLOR_DEBUG
	#define REXY_ENABLE_COLOR_DEBUG 1
#endif

//Debug output section
#if REXY_ENABLE_DEBUG_LEVEL > 0
	#define REXY_ENABLE_DEBUG_OUTPUT
#endif
#if REXY_ENABLE_DEBUG_LEVEL > 2
	#define REXY_ENABLE_DEBUG_VERBOSE_OUTPUT
#endif


#ifdef REXY_ENABLE_DEBUG_OUTPUT
	#include <cstdio> //fprintf, vfprintf
	#include <utility> //forward

	#include "source_location.hpp"


	namespace rexy::debug{
		namespace detail{
			static constexpr const char color_red[]    = "\033[38;5;9m";
			static constexpr const char color_yellow[] = "\033[38;5;11m";
			static constexpr const char color_green[]  = "\033[38;5;2m";
			static constexpr const char color_blue[]   = "\033[38;5;12m";
			static constexpr const char color_clear[]  = "\033[0m";
		}
		template<class... Args>
		struct print{
			explicit print(Args&&... args, const rexy::source_location& loc = rexy::source_location::current()){
				std::fprintf(stderr, "%s:%s:%d: ", loc.file_name(), loc.function_name(), loc.line());
				std::fprintf(stderr, std::forward<Args>(args)...);
			}
			print(const print&) = delete;
			print(print&&) = delete;
			print& operator=(const print&) = delete;
			print& operator=(print&&) = delete;
		};
		template<class... Args>
		print(Args&&...) -> print<Args&&...>;
		#ifdef REXY_ENABLE_COLOR_DEBUG
			template<class... Args>
			struct print_succ{
				explicit print_succ(Args&&... args, const rexy::source_location& loc = rexy::source_location::current()){
					std::fprintf(stderr, "%s", detail::color_green);
					std::fprintf(stderr, "%s:%s:%d: ", loc.file_name(), loc.function_name(), loc.line());
					std::fprintf(stderr, std::forward<Args>(args)...);
					std::fprintf(stderr, "%s", detail::color_clear);
				}
				print_succ(const print_succ&) = delete;
				print_succ(print_succ&&) = delete;
				print_succ& operator=(const print_succ&) = delete;
				print_succ& operator=(print_succ&&) = delete;
			};
			template<class... Args>
			struct print_info{
				explicit print_info(Args&&... args, const rexy::source_location& loc = rexy::source_location::current()){
					std::fprintf(stderr, "%s", detail::color_blue);
					std::fprintf(stderr, "%s:%s:%d: ", loc.file_name(), loc.function_name(), loc.line());
					std::fprintf(stderr, std::forward<Args>(args)...);
					std::fprintf(stderr, "%s", detail::color_clear);
				}
				print_info(const print_info&) = delete;
				print_info(print_info&&) = delete;
				print_info& operator=(const print_info&) = delete;
				print_info& operator=(print_info&&) = delete;
			};
			template<class... Args>
			struct print_warn{
				explicit print_warn(Args&&... args, const rexy::source_location& loc = rexy::source_location::current()){
					std::fprintf(stderr, "%s", detail::color_yellow);
					std::fprintf(stderr, "%s:%s:%d: ", loc.file_name(), loc.function_name(), loc.line());
					std::fprintf(stderr, std::forward<Args>(args)...);
					std::fprintf(stderr, "%s", detail::color_clear);
				}
				print_warn(const print_warn&) = delete;
				print_warn(print_warn&&) = delete;
				print_warn& operator=(const print_warn&) = delete;
				print_warn& operator=(print_warn&&) = delete;
			};
			template<class... Args>
			struct print_error{
				explicit print_error(Args&&... args, const rexy::source_location& loc = rexy::source_location::current()){
					std::fprintf(stderr, "%s", detail::color_red);
					std::fprintf(stderr, "%s:%s:%d: ", loc.file_name(), loc.function_name(), loc.line());
					std::fprintf(stderr, std::forward<Args>(args)...);
					std::fprintf(stderr, "%s", detail::color_clear);
				}
				print_error(const print_error&) = delete;
				print_error(print_error&&) = delete;
				print_error& operator=(const print_error&) = delete;
				print_error& operator=(print_error&&) = delete;
			};
		#else
			template<class... Args>
			class print_succ : public print<Args...>{
			public:
				using print<Args...>::print;
			};
			template<class... Args>
			class print_info : public print<Args...>{
			public:
				using print<Args...>::print;
			};
			template<class... Args>
			class print_warn : public print<Args...>{
			public:
				using print<Args...>::print;
			};
			template<class... Args>
			class print_error : public print<Args...>{
			public:
				using print<Args...>::print;
			};
		#endif //REXY_ENABLE_COLOR_DEBUG
		template<class... Args>
		print_warn(Args&&...) -> print_warn<Args&&...>;
		template<class... Args>
		print_error(Args&&...) -> print_error<Args&&...>;
		template<class... Args>
		print_info(Args&&...) -> print_info<Args&&...>;
		template<class... Args>
		print_succ(Args&&...) -> print_succ<Args&&...>;

		#ifdef REXY_ENABLE_DEBUG_VERBOSE_OUTPUT
			namespace verbose{
				template<class... Args>
				class print : public ::rexy::debug::print<Args...>{
				public:
					using ::rexy::debug::print<Args...>::print;
				};
				template<class... Args>
				class print_succ : public ::rexy::debug::print_succ<Args...>{
				public:
					using ::rexy::debug::print_succ<Args...>::print_succ;
				};
				template<class... Args>
				class print_info : public ::rexy::debug::print_info<Args...>{
				public:
					using ::rexy::debug::print_info<Args...>::print_info;
				};
				template<class... Args>
				class print_warn : public ::rexy::debug::print_warn<Args...>{
				public:
					using ::rexy::debug::print_warn<Args...>::print_warn;
				};
				template<class... Args>
				class print_error : public ::rexy::debug::print_error<Args...>{
				public:
					using ::rexy::debug::print_error<Args...>::print_error;
				};
				template<class... Args>
				print(Args&&...) -> print<Args&&...>;
				template<class... Args>
				print_warn(Args&&...) -> print_warn<Args&&...>;
				template<class... Args>
				print_error(Args&&...) -> print_error<Args&&...>;
				template<class... Args>
				print_info(Args&&...) -> print_info<Args&&...>;
				template<class... Args>
				print_succ(Args&&...) -> print_succ<Args&&...>;

			}

		#else
			namespace verbose{
				static constexpr inline void print(...){}
				static constexpr inline void print_succ(...){}
				static constexpr inline void print_info(...){}
				static constexpr inline void print_warn(...){}
				static constexpr inline void print_error(...){}
			}
		#endif //REXY_ENABLE_DEBUG_VERBOSE_OUTPUT
	}
#else
	namespace rexy::debug{
		static constexpr inline void print(...){}
		static constexpr inline void print_succ(...){}
		static constexpr inline void print_info(...){}
		static constexpr inline void print_warn(...){}
		static constexpr inline void print_error(...){}
		namespace verbose{
			static constexpr inline void print(...){}
			static constexpr inline void print_succ(...){}
			static constexpr inline void print_info(...){}
			static constexpr inline void print_warn(...){}
			static constexpr inline void print_error(...){}
		}
	}
#endif //REXY_ENABLE_DEBUG_OUTPUT

#endif