"""Offline preview: render text the way the mask will, printed as ASCII art.

No BLE / no hardware needed -- handy for checking how a string will look and for
confirming the renderer works on this machine::

    python examples/preview_text.py "HELLO"
"""

import sys

import bitmap


def main():
    text = sys.argv[1] if len(sys.argv) > 1 else "HELLO"
    columns = bitmap.text_to_columns(text)
    width = len(columns)
    bmp = bitmap.encode_bitmap(columns)
    print(f"text={text!r}  width={width}px  bitmap={len(bmp)}B  payload={len(bmp) + width * 3}B\n")
    for row in range(16):
        line = "".join("#" if columns[x][row] else " " for x in range(width))
        print(line)


if __name__ == "__main__":
    main()