"""Request loop run by the grader as uid 65534: python3.11 -I -S -B driver.py PKGROOT.

PKGROOT holds a root-owned copy of the *.py files of /app/canary.  Each request line is
"ID<TAB>PLAN-JSON"; canary.answer(plan) is called with the plan as a dict and the result is
written to the original stdout as one line "ID<TAB>OK<TAB>CANON" or "ID<TAB>ERR<TAB>message".
CANON is "none" for None and otherwise "q<numerator>/<denominator>", the exact value of the
returned number in lowest terms (an int or a fractions.Fraction; floats and bools are refused).
Anything the agent's code prints goes to stderr.  -S keeps site-packages off sys.path; it is
added back explicitly (jinja2).
"""
import os
import sys

proto = os.dup(1)
os.dup2(2, 1)
sys.path.insert(0, sys.argv[1])
for _p in ("/usr/local/lib/python3.11/site-packages",):
    sys.path.append(_p)
sys.set_int_max_str_digits(0)

import json  # noqa: E402
import numbers  # noqa: E402
from fractions import Fraction  # noqa: E402


def answer(text):
    data = (text.replace("\n", " ").replace("\r", " ") + "\n").encode("utf-8", "replace")
    while data:
        n = os.write(proto, data)
        data = data[n:]


def canon(v):
    if v is None:
        return "none"
    if isinstance(v, bool) or not isinstance(v, numbers.Rational):
        raise TypeError("answer must be an int, a Fraction or None, got %s" % type(v).__name__)
    f = Fraction(v.numerator, v.denominator)
    return "q%d/%d" % (f.numerator, f.denominator)


from canary import answer as solve  # noqa: E402

answer("READY")
for line in sys.stdin:
    line = line.rstrip("\n")
    if not line:
        continue
    rid, payload = line.split("\t", 1)
    try:
        plan = json.loads(payload)
        answer(rid + "\tOK\t" + canon(solve(plan)))
    except BaseException as exc:  # noqa: BLE001
        answer(rid + "\tERR\t" + ("%s: %s" % (type(exc).__name__, exc))[:300])