/* Copyright 2020-2022, Michele Santullo
 * This file is part of wrenpp.
 *
 * Wrenpp 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.
 *
 * Wrenpp 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 wrenpp.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "wrenpp/def_configuration.hpp"
#include <iostream>
#include <algorithm>

namespace wren {
	namespace {
		template <typename T>
		bool empty(T* message) {
			return not (message and *message);
		}
	} //unnamed namespace

	void DefConfiguration::write_fn (VM*, wren_string_t text) {
		std::cout << text;
	}

	void DefConfiguration::error_fn (VM*, ErrorType type, wren_string_t module, int line, wren_string_t message) {
		using std::empty;

		std::cerr << "Wren error: " << message;
		if (!empty(module)) {
			std::cerr << " in " << module;
			if (line > -1) {
				std::cerr << ':' << line;
			}
		}
		std::cerr << '\n';
	}

	void* DefConfiguration::reallocate_fn (void* ptr, std::size_t size) {
		if (ptr and size) {
			//reallocate
			char* const old_mem = static_cast<char*>(ptr);
			char* const new_mem = new char[size];
			std::copy(old_mem, old_mem + size, new_mem);
			delete[] old_mem;
			return new_mem;
		}
		else if (ptr and not size) {
			//free
			char* const old_mem = static_cast<char*>(ptr);
			delete[] old_mem;
		}
		else if (not ptr and size) {
			//allocate
			char* const new_mem = new char[size];
			return new_mem;
		}
		return nullptr;
	}
} //namespace wren