#include <iostream>
#include <cstdlib>
#include <cctype>   //for isprint (or ctype.h)
#include <cstring>
#include "terminal.h"
using namespace std;

terminal::terminal(char initial_background)
: _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()
{
    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
{
    if (!isprint(static_cast<unsigned char>(c))) {
        cerr << "unprintable character "
             << static_cast<unsigned>(static_cast<unsigned char>(c))
             << ".\n";
        system("PAUSE");
        exit(EXIT_FAILURE);
    }

    check(x, y);
    term_put(x, y, c);
}

void terminal::put(unsigned x, unsigned y, const char *s) const
{
    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::put(unsigned x, unsigned y, const string &s) const
{
    for (string::size_type i = 0; i <s.size() && s[i] != '\0'; ++i) {
        put(x, y, s[i]);
        next(x, y);
    }
}

void terminal::next(unsigned& x, unsigned& y) const
{
    check(x, y);
    if (++x >= _xmax) {
        x = 0;
        ++y;
    }
}

void terminal::check(unsigned x, unsigned y) const
{
    if (!in_range(x, y)) {
        cerr << "coordinates (" << x << ", " << y
             << ") must be >= (0, 0) and < ("
             << _xmax << ", " << _ymax << ")\n";
        exit(EXIT_FAILURE);
    }
}