#!/usr/bin/python

from os import system
from subprocess import run, TimeoutExpired
from sys import stdin, stdout
from tempfile import mkstemp

sandbox = None

template = '''
|0100
    ( start ) %s ( end )

    #05 DEI ,emit-wst/n STR
    ;wst print

@dump-wst
    #04 DEI #01 GTH ?&next !emit-wst &next STH !dump-wst

@emit-wst
    #05 DEI LIT [ &n $1 ] GTH ?&next #0a18 DEO !start-rst
    &next STHr emit #2018 DEO !emit-wst

@start-rst
    ;rst print

@dump-rst
    #05 DEI #00 GTH ?&next !emit-rst &next STHr !dump-rst

@emit-rst
    #04 DEI #01 GTH ?&next #0a18 DEO #800f DEO BRK
    &next emit #2018 DEO !emit-rst

@print ( addr* -> )
    LDAk DUP ?{ POP POP2 JMP2r } #18 DEO INC2 !print

@emit
    DUP #04 SFT ,&ch JSR
    &ch #0f AND DUP #09 GTH #27 MUL ADD #30 ADD #18 DEO JMP2r

@rst "rst 20 00
@wst "wst 20 00
'''

def write_rom(path, s):
    f = open(path, 'w')
    prog = template % s
    f.write(prog)
    f.close()

def execute(s, sandbox=None, timeout=2.0):
    _, tmp_tal = mkstemp(suffix='.tal', prefix='uxnrepl')
    _, tmp_rom = mkstemp(suffix='.rom', prefix='uxnrepl')
    write_rom(tmp_tal, s)
    try:
        res = run(['uxnasm', tmp_tal, tmp_rom], cwd=sandbox, capture_output=True, timeout=timeout)
    except TimeoutExpired:
        return b'uxnasm: timed out'
    if res.returncode != 0:
        return res.stderr
    try:
        res = run(['uxncli', tmp_rom], cwd=sandbox, capture_output=True, timeout=timeout)
    except TimeoutExpired:
        return b'uxncli: timed out'
    return res.stdout

def main():
    print('uxnrepl (ctrl-d to exit)')
    while True:
        stdout.write('> ')
        stdout.flush()
        s = stdin.readline()
        if not s:
            print('bye!')
            break
        stdout.write(execute(s).decode('utf-8'))
        stdout.flush()

if __name__ == "__main__":
    main()