// ncurses.c
// Implements interface.h
// Provides an in-terminal interface to the emulator.

#include"interface.h"
#include"signetics.c"
#include<ncurses.h>


int TermX = 0;
int TermY = 0;

void TerminalInit()
{
    initscr();
    cbreak();
    noecho();
    curs_set(0);

    TerminalShiftRegister = (byte*)malloc(960);
    TerminalShiftRegisterPosition = TerminalShiftRegister;
    TerminalShiftRegisterOffset = 0;
}

void TerminalClose()
{
    free(TerminalShiftRegister);
    curs_set(0);
    endwin();
}

void TerminalInput(char n)
{
    mvaddch(TermY,TermX,n);

    *TerminalShiftRegisterPosition = n;
    TerminalShiftRegisterPosition++;
    if (TerminalShiftRegisterPosition >= (TerminalShiftRegister + 960))
        TerminalShiftRegisterPosition = TerminalShiftRegister;
    

    TermX++;

    if (n == KEY_ENTER) {
        TermY++;
    }

    if (TermX >= 40) {
        TermX = 0;
        TermY++;
    }

    if (TermY >= 24) {
        TerminalShiftRegisterOffset += 40; // Discard first line
        if (TerminalShiftRegisterOffset >= 960)
            TerminalShiftRegisterOffset = TerminalShiftRegister;

        byte *offset = TerminalShiftRegister + TerminalShiftRegisterOffset;

        // For every position, fill with contents of the terminal shift register
        for (int i = 0; i < 23; i++) {
        for (int j = 0; j < 40; j++) {

            if (offset >= (TerminalShiftRegister + 960))
                offset -= 960;
            
            mvaddch(i,j, *(offset));
            offset++;
        }}

        TermY = 23;
        TermX = 0;

        // Clear bottom line.
        mvwprintw(stdscr, TermY, TermX, "                                        ");
    }

    mvaddch(TermY, TermX, '@' | A_BLINK);
}