'''
This file implements debug methods to check whether
hashrev.bcrypt() operates identically to hash.bcrypt().
TLDR: test if I made a dumb typo.
'''

from random import randint, randbytes
import bcrypt.hash
import bcrypt.hashrev

def is_bcrypt_eq(x: bytes, R_table: Optional[dict[int, int]] = None) -> bool:
    return hashrev.bcrypt(x, R_table=R_table) == hash.bcrypt(x)

'''
Display internals of testing bcrypt implementations
from bcrypt/hash.py and bcrypt/hashrev.py
NOTE: By default this runs 10000 trials for
NOTE: random sequences of length 0-16 bytes.
'''
def disint_bcrypt_eq(trials: int = 10000, 
                     max_bytes: int = 16) -> bytes | None:
    R_table = hashrev.calc_R_array(max = 255)
    for i in range(trials):
        # generate random bytes
        num_bytes = randint(0, max_bytes)
        x = randbytes(num_bytes)
        
        # test the modified bcrypt with the original    
        hash_rev = hashrev.bcrypt(x, R_table=R_table)
        hash_expected = hash.bcrypt(x)
        if hash_rev != hash_expected:
            print(f'Your hashfn sucks, big mistake bucko!! (failed iter: {i})')
            print(f'     Got: {hash_rev}')
            print(f'Expected: {hash_bcrypt}')
            print(f'Input Bytes: {[str(b) for b in x]}')
            return x

    print('Impeccable hashfn holy moly!!')
    return None