"""Tests for PIN hashing and verification."""

from vigilar.alerts.pin import hash_pin, verify_pin


def test_hash_pin_returns_formatted_string():
    result = hash_pin("1234")
    parts = result.split("$")
    assert len(parts) == 3
    assert parts[0] == "pbkdf2_sha256"
    assert len(parts[1]) == 32  # 16 bytes hex = 32 chars
    assert len(parts[2]) == 64  # 32 bytes hex = 64 chars


def test_verify_pin_correct():
    stored = hash_pin("5678")
    assert verify_pin("5678", stored) is True


def test_verify_pin_wrong():
    stored = hash_pin("5678")
    assert verify_pin("0000", stored) is False


def test_verify_pin_empty_hash_returns_true():
    assert verify_pin("1234", "") is True
    assert verify_pin("", "") is True


def test_hash_pin_different_salts():
    h1 = hash_pin("1234")
    h2 = hash_pin("1234")
    assert h1 != h2


def test_verify_pin_handles_unicode():
    stored = hash_pin("p@ss!")
    assert verify_pin("p@ss!", stored) is True
    assert verify_pin("p@ss?", stored) is False