#! /usr/bin/env python3

def sign(x):
    return '-' if x < 0 else '+'

def txt2forth(src, dst, xoffset: int, yoffset: int, comment: str):
    lines = src.readlines()
    rows = len(lines)
    cols = max(map(len, lines))
    dst.write(': logo ( x y -- ) \\ {comment} ({rows} rows x {cols} columns)\n\n'.format(comment=comment,
                                                                                         rows=rows, cols=cols))
    dst.write('\t{xabs} {xsign} swap {yabs} {ysign} swap\n\n'.format(xabs=abs(xoffset), xsign=sign(xoffset),
                                                                     yabs=abs(yoffset), ysign=sign(yoffset)))
    for line in lines[:-1]:
        dst.write('\t2dup at-xy ." {}" 1+\n'.format(line.replace('\n', '')))
    dst.write(    '\t     at-xy ." {}"\n\n'.format(lines[-1].replace('\n', '')))
    dst.write(    '\t\\ Put the cursor back at the bottom\n\t0 25 at-xy\n;\n')

def main():
    import sys

    if len(sys.argv) != 4:
        print("usage: {} xoffset yoffset comment")
        print("  Reads ASCII art from stdin, writes Forth to stdout")
        exit(1)

    txt2forth(src = sys.stdin,
              dst = sys.stdout,
              xoffset = int(sys.argv[1]),
              yoffset = int(sys.argv[2]),
              comment = sys.argv[3])

if __name__ == "__main__":
    main()