"""Authentication tests for Patient Monitoring System."""

import pytest


def validate_credentials(username: str, password: str) -> bool:
    """Simulated credential validation."""
    return username == "nurse1" and password == "secure123"


def hash_password(password: str) -> str:
    """Simulated password hashing (bcrypt simulation)."""
    return f"$2b$12${password[::-1]}"


def check_login_attempts(username: str) -> bool:
    """Simulated login throttling check."""
    # In real implementation, would check attempt count
    return True


def generate_jwt(user_id: str) -> str:
    """Simulated JWT generation."""
    return f"eyJ.{user_id}.sig"


def refresh_token(token: str) -> str:
    """Simulated token refresh."""
    return f"{token}.refreshed"


# SRS001: Credential Validation
@pytest.mark.requirement("SRS001")
def test_valid_credentials_accepted(jamb_log):
    """Test that valid credentials return True."""
    jamb_log.test_action("Submit valid credentials for nurse1")
    jamb_log.expected_result("Authentication returns True")
    jamb_log.note("Verifying positive authentication path")
    jamb_log.note("Using username: nurse1, password: secure123")
    assert validate_credentials("nurse1", "secure123") is True
    jamb_log.actual_result("Authentication returned True")


@pytest.mark.requirement("SRS001")
def test_invalid_credentials_rejected(jamb_log):
    """Test that invalid credentials return False."""
    jamb_log.test_action("Submit invalid password for nurse1")
    jamb_log.expected_result("Authentication returns False")
    jamb_log.note("Verifying negative authentication path")
    assert validate_credentials("nurse1", "wrong") is False
    jamb_log.actual_result("Authentication returned False")


# SRS002: Password Hashing
@pytest.mark.requirement("SRS002")
def test_password_hashing_uses_bcrypt():
    """Test that password hashing produces bcrypt format."""
    hashed = hash_password("mypassword")
    assert hashed.startswith("$2b$12$")


@pytest.mark.requirement("SRS002")
def test_password_hashing_produces_different_output():
    """Test that hashing transforms the password."""
    hashed = hash_password("mypassword")
    assert "mypassword" not in hashed


# SRS003: Login Throttling
@pytest.mark.requirement("SRS003")
def test_login_allowed_when_under_threshold():
    """Test that login is allowed when under attempt threshold."""
    assert check_login_attempts("nurse1") is True


# SRS004: Session Token
@pytest.mark.requirement("SRS004")
def test_jwt_generation():
    """Test that JWT token is generated."""
    token = generate_jwt("user123")
    assert token.startswith("eyJ")
    assert "user123" in token


# SRS005: Session Refresh
@pytest.mark.requirement("SRS005")
def test_token_refresh():
    """Test that token can be refreshed."""
    original = generate_jwt("user123")
    refreshed = refresh_token(original)
    assert refreshed != original
    assert "refreshed" in refreshed
