require 'ncurses'
include Ncurses

ESC=27;

def DrawBox(fenetre)
       	fenetre.erase;
	fenetre.attron(Ncurses.COLOR_PAIR(5));
       	Ncurses.box(fenetre,ACS_VLINE,ACS_HLINE);
	fenetre.attroff(Ncurses.COLOR_PAIR(3));
end

def Loading(fenetre_support,i,texte_explicatif)
        begin_y_fenetre_support=Ncurses.getbegy(fenetre_support);
        begin_x_fenetre_support=Ncurses.getbegx(fenetre_support);

        taille_y_fenetre_support=Ncurses.getmaxy(fenetre_support);
        taille_x_fenetre_support=Ncurses.getmaxx(fenetre_support);

	if((i*(taille_x_fenetre_support-2))/100 < 1) 
		n=1;
	else
		n=(i*(taille_x_fenetre_support-2))/100;
	end	

	fenetre_interne=WINDOW.new(taille_y_fenetre_support-2,n,begin_y_fenetre_support+1,begin_x_fenetre_support+1);
	fenetre_interne.bkgd(Ncurses.COLOR_PAIR(4));

	DrawBox(fenetre_support);

	Ncurses.mvwaddstr(fenetre_support,0,(taille_x_fenetre_support-texte_explicatif.length+2)/2," " + texte_explicatif + " ");
        Ncurses.mvwprintw(fenetre_support,taille_y_fenetre_support-1,(taille_x_fenetre_support-(i.to_s.length+2))/2," %d%s ",i,"%");        

	stdscr.refresh;
	fenetre_support.refresh;
        fenetre_interne.refresh;
	Ncurses.delwin(fenetre_interne);
end

# On initialise Ncurses.
stdscr = Ncurses.initscr;

# ON configurer l'interface. 
Ncurses.start_color; 
Ncurses.curs_set(0); 
Ncurses.noecho; 
Ncurses.cbreak;
Ncurses.keypad(stdscr, true); 

# On crée les couleurs.
Ncurses.init_pair(1,COLOR_WHITE,COLOR_BLACK);
Ncurses.init_pair(2,COLOR_WHITE,COLOR_BLUE);
Ncurses.init_pair(3,COLOR_BLUE,COLOR_CYAN);
Ncurses.init_pair(4,COLOR_WHITE,COLOR_RED);
Ncurses.init_pair(5,COLOR_BLACK,COLOR_CYAN);

# On crée la barre de progression en fonction de la taille du terminal.
maxy=Ncurses.getmaxy(stdscr);
maxx=Ncurses.getmaxx(stdscr);
x=maxx-8;
shadow_barre=WINDOW.new(3,x,(maxy-3)/2+1,(maxx-x)/2+2);
barre_de_progression=WINDOW.new(3,x,(maxy-3)/2,(maxx-x)/2);

stdscr.bkgd(Ncurses.COLOR_PAIR(2));
shadow_barre.bkgd(Ncurses.COLOR_PAIR(1));
barre_de_progression.bkgd(Ncurses.COLOR_PAIR(3));

Ncurses.addstr("Tapez la touche que vous voulez pour continuer.\nTapez echap pour sortir.");

stdscr.refresh;

# On lance l'actionement de l'interface.
while stdscr.getch!=ESC
	i=1;
	while i<=100
		shadow_barre.refresh();
		Loading(barre_de_progression,i,"Installation paquet n°#{i}");
		i=i+1;
	end
end

Ncurses.delwin(barre_de_progression);
Ncurses.endwin;