#!/usr/bin/env python3
"""Does the judge actually FAIL when the artifact lies?

A verdict that cannot go nonzero is a tautology. This plants a real defect --
rewriting the runner's PASS to UNVERIFIED -- and asserts the judge exits
nonzero. Exit 0 == the judge has teeth.

The judge discovers its artifact relative to its own location, so the honest
way to point it at a broken artifact is to copy both files into a scratch dir
and run the copy. An earlier version of this probe instead did a string
replace on a hardcoded absolute path that no longer exists in _judge.py; the
replace silently matched nothing, so the probe's own premise was never
checked. It is now asserted: if the mutation does not apply, the probe fails
loudly instead of printing TEETH OK over an unmutated artifact.
"""
import os
import shutil
import subprocess
import sys
import tempfile

HERE = os.path.dirname(os.path.abspath(__file__))
ART = os.path.join(HERE, "proveit.py")
JUDGE = os.path.join(HERE, "_judge.py")

OLD = 'status="PASS" if (ok and measured) else "FAIL"'
NEW = 'status="UNVERIFIED" if (ok and measured) else "FAIL"'

src = open(ART, encoding="utf-8").read()
mutated = src.replace(OLD, NEW, 1)
if mutated == src:
    # The anchor is gone or no longer unique: the premise of this probe is
    # false, so the probe must not report success.
    print("TOOTHLESS: mutation anchor %r not found in %s" % (OLD, ART))
    sys.exit(1)

tmp = tempfile.mkdtemp(prefix="proveit-teeth-")
try:
    bad = os.path.join(tmp, "proveit.py")
    with open(bad, "w", encoding="utf-8") as fh:
        fh.write(mutated)
    shutil.copy2(JUDGE, os.path.join(tmp, "_judge.py"))

    p = subprocess.run([sys.executable, os.path.join(tmp, "_judge.py")],
                       capture_output=True, text=True, cwd=tmp)
finally:
    shutil.rmtree(tmp, ignore_errors=True)

print("mutated-artifact judge exit code: %d" % p.returncode)
print("--- judge output (tail) ---")
for line in p.stdout.strip().splitlines()[-6:]:
    print(line)

if p.returncode == 0:
    print()
    print("TOOTHLESS: judge passed a mutated artifact -> verdict is a tautology")
    sys.exit(1)
print()
print("TEETH OK: judge rejected the mutated artifact (exit %d)" % p.returncode)
sys.exit(0)