// throw macros for OS X and other POSIX systems
// adapted for Windows as well, november 2014
// copyright © 2002-2014 Bob Polis

#include <string>
#include <sstream>
#include <iostream>
#include <stdexcept>
#include <system_error>
#include "throw.hpp"

using namespace std;

static string combine_message_elements(const char* file, unsigned int line, const char* user_message, const char* sys_message)
{
    ostringstream msg;
    string f {file};
    msg << sys_message << " (" << f.substr(f.rfind('/') + 1) << ":" << line << ")";
    if (user_message) {
        msg << ", " << user_message;
    }
    return msg.str();
}

void __throw_if_min1(int x, const char* file, unsigned int line, const char* message)
{
    if (x == -1) {
        error_code ec {errno, system_category()};
        ostringstream ec_str;
        ec_str << "system error " <<  ec.value() << ": " << ec.message();
        string msg {combine_message_elements(file, line, message, ec_str.str().c_str())};
		throw system_error {ec, msg};
    }
}

void __throw_if_null(const void* p, const char* file, unsigned int line, const char* message)
{
    if (p == nullptr) {
        string msg {combine_message_elements(file, line, message, "null pointer exception")};
		throw runtime_error {msg};
    }
}

void __throw_if_err(int err, const char* file, unsigned int line, const char* message)
{
	if (err != 0) {
		error_code ec {err, system_category()};
		ostringstream ec_str;
		ec_str << "error " <<  err;
		string msg {combine_message_elements(file, line, message, ec_str.str().c_str())};
		throw system_error {ec, msg};
	}
}