#include <stdio.h>
#include <conio.h>
#include <bios/text.h>

/*
 * Exercises every BIOS text wrapper from <bios/text.h>:
 *   bios_set_place / bios_get_place
 *   bios_fillchar / bios_fillchar_noattr / bios_fillattr
 *   bios_writeattr / bios_write
 *   bios_writeattr_until / bios_write_until  (pad to length)
 *   bios_writeattr_stop  / bios_write_stop   (stop at separator)
 *   bios_clearwin / bios_clearwin_ch
 *   bios_scrollwin
 *
 * `s` below is a static buffer (not a string literal) so its address is
 * always inside window 2, as the BIOS print routines require.
 */

static char s[16];

int main(void)
{
    clrscr();

    /* Step 0 check: does LP_PRINT_LN advance the BIOS "place" cursor
     * by the number of characters printed, or leave it untouched?
     * "Hello" is 5 chars -> if place advances, before=(20,5),
     * after=(20,10); if not, after == before. */
    s[0]='H'; s[1]='e'; s[2]='l'; s[3]='l'; s[4]='o';
    bios_set_place(20, 5);
    {
        uint16_t before = bios_get_place();
        bios_writeattr(s, 5, COLOR(COLOR_WHITE, COLOR_BLACK));
        uint16_t after = bios_get_place();
        gotoxy(2, 0);
        textattr(0x0F);
        printf("STEP0: before row=%u col=%u\n", before >> 8, before & 0xFF);
        printf("STEP0: after  row=%u col=%u\n", after >> 8, after & 0xFF);
        printf("STEP0: expect after col=10 if place advances,\n");
        printf("       col=5 if it does NOT advance.\n");
    }
    (void)getch();

    bios_set_place(1, 2);
    bios_fillcharattr('*', COLOR(COLOR_YELLOW, COLOR_BLUE), 10);
    (void)getch();

    bios_set_place(2, 2);
    textattr(COLOR(COLOR_WHITE, COLOR_BLACK));
    cputs("attr already on screen ->");
    (void)getch();

    bios_set_place(2, 27);
    bios_fillchar('#', 10);
    (void)getch();

    bios_set_place(3, 2);
    bios_fillattr(COLOR(COLOR_BLACK, COLOR_LIGHTGREEN), 20);
    (void)getch();

    s[0]='H'; s[1]='e'; s[2]='l'; s[3]='l'; s[4]='o';
    bios_set_place(5, 2);
    bios_writeattr(s, 5, COLOR(COLOR_LIGHTRED, COLOR_BLACK));
    (void)getch();

    bios_set_place(6, 2);
    bios_write(s, 5);
    (void)getch();

    s[0]='A'; s[1]='B'; s[2]=':'; s[3]='X'; s[4]='Y'; s[5]='Z';
    bios_set_place(8, 2);
    bios_writeattr_until(s, 12, COLOR(COLOR_CYAN, COLOR_BLACK), ':');
    (void)getch();

    bios_set_place(9, 2);
    bios_write_until(s, 12, ':');
    (void)getch();

    bios_set_place(10, 2);
    bios_writeattr_stop(s, 12, COLOR(COLOR_MAGENTA, COLOR_BLACK), ':');
    (void)getch();

    bios_set_place(11, 2);
    bios_write_stop(s, 12, ':');
    (void)getch();

    bios_clearwin(13, 2, 4, 20, COLOR(COLOR_BLACK, COLOR_RED));
    bios_clearwin_ch(13, 25, 4, 20, COLOR(COLOR_WHITE, COLOR_BLUE), '.');
    (void)getch();

    bios_set_place(18, 2);
    (void)getch();
    cputs("place test ->");
    {
        uint16_t place = bios_get_place();
        printf(" row=%u col=%u\n", place >> 8, place & 0xFF);
    }
    (void)getch();

    gotoxy(2, 20);
    for (int i = 0; i < 6; i++) {
        textattr(0x0F);
        printf("scroll line %d\n", i);
    }
    (void)getch();
    bios_scrollwin(BIOS_SCROLL_UP, 20, 3);

    (void)getch();
    return 0;
}