"""Unit tests for the staleness-check logic (canlex/refresh.py). Offline only."""
import unittest

from canlex import refresh


class ExtractCurrentDateTests(unittest.TestCase):
    def test_reads_root_attribute(self):
        head = (b'<?xml version="1.0"?>\n<Statute xmlns:lims="..." '
                b'lims:current-date="2026-03-31" lims:lastAmendedDate="2026-03-26">')
        self.assertEqual(refresh._extract_current_date(head), "2026-03-31")

    def test_strips_utf8_bom(self):
        head = b'\xef\xbb\xbf<Regulation lims:current-date="2019-06-21">'
        self.assertEqual(refresh._extract_current_date(head), "2019-06-21")

    def test_returns_empty_when_absent(self):
        self.assertEqual(refresh._extract_current_date(b"<Statute foo='bar'>"), "")

    def test_takes_the_current_date_not_amended_date(self):
        # lastAmendedDate must not be mistaken for current-date.
        head = b'<Statute lims:lastAmendedDate="2099-01-01" lims:current-date="2026-05-26">'
        self.assertEqual(refresh._extract_current_date(head), "2026-05-26")


class PendingInForceTests(unittest.TestCase):
    def test_surfaces_a_bill_once_its_date_passes(self):
        # C-16 in force 2026-07-18 in the tracked list.
        after = refresh.pending_in_force("2026-08-01")
        self.assertTrue(any(b["bill"] == "C-16" for b in after))

    def test_hides_a_bill_before_its_date(self):
        before = refresh.pending_in_force("2026-07-01")
        self.assertFalse(any(b["bill"] == "C-16" for b in before))


class CbsaInstrumentRegexTests(unittest.TestCase):
    def test_extracts_dated_instruments_from_index_html(self):
        html = ('<a href="delegation/irpa-lipr-2023-05-08-eng.html">base</a>'
                '<a href="delegation/irpa-lipr-2025-07-10-eng.html">amend</a>'
                '<a href="desig/po-ag_2022-08-eng.html">peace officer</a>')
        found = sorted(set(refresh._CBSA_INSTRUMENT_RE.findall(html)))
        self.assertEqual(found, ["2023-05-08", "2025-07-10"])
        # the peace-officer designation is a different filename and is not picked up
        self.assertNotIn("2022-08", "".join(found))

    def test_new_instrument_is_the_set_difference(self):
        have = ["2023-05-08", "2025-07-10"]
        published = ["2023-05-08", "2025-07-10", "2026-02-01"]
        self.assertEqual(sorted(set(published) - set(have)), ["2026-02-01"])

    def test_il3_version_stamp_regex(self):
        m = refresh._IL3_VERSION_RE.search("IL 3 ... Fall 2025 ... Operational")
        self.assertEqual(m.group(0), "Fall 2025")


class DriftSemanticsTests(unittest.TestCase):
    def test_iso_date_string_compare_detects_newer_upstream(self):
        # The check uses plain string comparison on ISO dates; verify ordering.
        self.assertTrue("2026-05-26" > "2026-03-31")
        self.assertFalse("2026-03-31" > "2026-03-31")


if __name__ == "__main__":
    unittest.main()