#include <cctype>   //for isprint
#include "terminal.h"
using namespace std;

terminal::terminal(char initial_background) throw (unprintable, out_of_range)
	: _background(initial_background),
	_xmax((term_construct(), term_xmax())),
	_ymax(term_ymax())
{
	if (_background != ' ') {
		for (unsigned y = 0; y < _ymax; ++y) {
			for (unsigned x = 0; x < _xmax; ++x) {
				put(x, y);
			}
		}
	}
}

terminal::~terminal() throw (unprintable, out_of_range)
{
	for (unsigned y = 0; y < _ymax; ++y) {
		for (unsigned x = 0; x < _xmax; ++x) {
			put(x, y, ' ');
		}
	}

	term_destruct();
}

void terminal::put(unsigned x, unsigned y, char c) const
	throw (unprintable, out_of_range)
{
	if (isprint(c) == 0) {
		throw unprintable(x, y, c);
	}

	if (!in_range(x, y)) {
		throw out_of_range(x, y, _xmax, _ymax);
	}

	term_put(x, y, c);
}

void terminal::put(unsigned x, unsigned y, const char *s) const
	throw (unprintable, out_of_range)
{
	for (; *s != '\0'; ++s) {
		put(x, y, *s);
		next(x, y);
	}
}

//Move to the next (x, y) position: left to right, top to bottom.
//Warning: will change the values of the arguments.

void terminal::next(unsigned& x, unsigned& y) const throw (out_of_range)
{
	if (!in_range(x, y)) {
		throw out_of_range(x, y, _xmax, _ymax);
	}

	if (++x >= _xmax) {
		x = 0;
		++y;
	}
}