#!/usr/bin/env python3
"""Independent oracle for cycle 02.

Reads the 20-literal probe's stdout and checks every reported SHA-256 against
Python's hashlib. The El runtime is the system under test; hashlib is the
reference. Also counts how many literals hashed as the EMPTY STRING, which is
the signature of el_input_len returning 0.
"""
import sys, hashlib
EMPTY = hashlib.sha256(b"").hexdigest()
ok = bad = empty = n = 0
for line in sys.stdin:
    line = line.strip()
    if not line:
        continue
    parts = dict(p.split("=", 1) for p in line.split(" ") if "=" in p)
    lit, got = parts["lit"], parts["sha"]
    n += 1
    if got == EMPTY:
        empty += 1
    exp = hashlib.sha256(lit.encode()).hexdigest()
    if got == exp:
        ok += 1
    else:
        bad += 1
        print("MISMATCH lit=%s got=%s expected=%s" % (lit, got, exp))
print("literals tested              = %d" % n)
print("correct vs hashlib.sha256    = %d" % ok)
print("incorrect                    = %d" % bad)
print("hashed as the EMPTY STRING   = %d" % empty)
print("failure rate                 = %.0f%%" % (100.0 * empty / n if n else 0))