"""SP18 — PII scrubber tests.

Covers each PHI pattern, the false-positive guard, and the
disable toggle.
"""
from __future__ import annotations

import logging

import pytest

from cyclone.logging_config import (
    PiiScrubber,
    get_scrubber,
    setup_logging,
)


def _make_record(msg: str, extras: dict | None = None) -> logging.LogRecord:
    record = logging.getLogger("test.scrub").makeRecord(
        name="test.scrub", level=logging.INFO, fn="t.py", lno=1,
        msg=msg, args=(), exc_info=None,
    )
    if extras:
        for k, v in extras.items():
            setattr(record, k, v)
    return record


@pytest.fixture(autouse=True)
def _reset_scrubber():
    """Make sure the scrubber is enabled + on the root after each test."""
    yield
    get_scrubber().enable()


# ---------------------------------------------------------------------------
# NPI
# ---------------------------------------------------------------------------


def test_scrubs_ten_digit_npi_in_message():
    scrubber = PiiScrubber()
    rec = _make_record("processed claim with npi 1881068062 ok")
    assert scrubber.filter(rec) is True
    assert rec.getMessage() == "processed claim with npi <redacted:npi> ok"


def test_scrubs_npi_in_extras():
    scrubber = PiiScrubber()
    rec = _make_record("ok", extras={"provider_npi": "1881068062"})
    scrubber.filter(rec)
    assert rec.provider_npi == "<redacted:npi>"


def test_does_not_scrub_short_numbers():
    scrubber = PiiScrubber()
    rec = _make_record("processed 5 claims in 2 batches")
    scrubber.filter(rec)
    assert rec.getMessage() == "processed 5 claims in 2 batches"


def test_does_not_scrub_eleven_digit_numbers():
    """11+ digit numbers aren't NPIs — leave them alone."""
    scrubber = PiiScrubber()
    rec = _make_record("control number 12345678901")
    scrubber.filter(rec)
    assert rec.getMessage() == "control number 12345678901"


# ---------------------------------------------------------------------------
# SSN
# ---------------------------------------------------------------------------


def test_scrubs_dashed_ssn_in_message():
    scrubber = PiiScrubber()
    rec = _make_record("ssn=123-45-6789 detected")
    scrubber.filter(rec)
    assert rec.getMessage() == "ssn=<redacted:ssn> detected"


def test_scrubs_undashed_ssn_at_phrase_boundary():
    """A bare 9-digit number is ambiguous — we scrub it when followed
    by whitespace/punctuation/closing paren/brace/comma (so we don't
    hit claim control numbers or zip codes mid-sentence)."""
    scrubber = PiiScrubber()
    rec = _make_record("ssn 123456789 on file")
    scrubber.filter(rec)
    assert "<redacted:ssn>" in rec.getMessage()


# ---------------------------------------------------------------------------
# DOB
# ---------------------------------------------------------------------------


def test_scrubs_dob_field():
    scrubber = PiiScrubber()
    rec = _make_record("dob=1980-04-12 verified")
    scrubber.filter(rec)
    assert rec.getMessage() == "dob=<redacted:dob> verified"


def test_scrubs_dob_in_extras():
    scrubber = PiiScrubber()
    rec = _make_record("ok", extras={"date_of_birth": "1980-04-12"})
    scrubber.filter(rec)
    assert rec.date_of_birth == "<redacted:dob>"


def test_does_not_scrub_bare_iso_date():
    """A YYYY-MM-DD without a dob= prefix isn't necessarily PHI."""
    scrubber = PiiScrubber()
    rec = _make_record("parsed at 2026-06-21")
    scrubber.filter(rec)
    assert rec.getMessage() == "parsed at 2026-06-21"


# ---------------------------------------------------------------------------
# Patient name
# ---------------------------------------------------------------------------


def test_scrubs_patient_name_field():
    scrubber = PiiScrubber()
    rec = _make_record('patient_name="John Doe" verified')
    scrubber.filter(rec)
    assert "John Doe" not in rec.getMessage()
    assert "<redacted:patient_name>" in rec.getMessage()


def test_does_not_scrub_random_words():
    scrubber = PiiScrubber()
    rec = _make_record("the parser ran successfully")
    scrubber.filter(rec)
    assert rec.getMessage() == "the parser ran successfully"


# ---------------------------------------------------------------------------
# Disable toggle
# ---------------------------------------------------------------------------


def test_scrubber_disabled_leaves_message_intact():
    scrubber = PiiScrubber()
    scrubber.disable()
    rec = _make_record("npi 1881068062 ok")
    scrubber.filter(rec)
    assert rec.getMessage() == "npi 1881068062 ok"


def test_scrubber_does_not_crash_on_unusual_records():
    """Even with weird attribute combinations the filter returns True."""
    scrubber = PiiScrubber()
    rec = _make_record("ok", extras={"weird": object()})
    assert scrubber.filter(rec) is True