from datetime import datetime, timezone, timedelta
import json
from pathlib import Path
import sys
import tempfile
import unittest
import uuid
sys.path.insert(0, str(Path(__file__).resolve().parents[1] / 'scripts'))
from receiver import Receiver, strict_json
from platform_event import translate

NOW = datetime(2026, 9, 6, tzinfo=timezone.utc)


class ReceiverTests(unittest.TestCase):
    def setUp(self):
        self.temp = tempfile.TemporaryDirectory()
        self.addCleanup(self.temp.cleanup)
        self.path = Path(self.temp.name) / 'receiver.db'
        self.contract = dict(schema='railiance-telemetry.stream.v1', stream='test',
            producer='platform', recipient='test-operator', signals=['db.restore'],
            max_event_age_seconds=900, heartbeat_seconds=900, retention_days=30)
        self.receiver = Receiver(self.path, self.contract)
        self.addCleanup(lambda: self.receiver.close())

    def event(self, state='healthy', when=NOW):
        return dict(schema='railiance-telemetry.signal.v1', id=str(uuid.uuid4()),
            stream='test', producer='platform', observed_at=when.isoformat(), states={'db.restore': state})

    def test_failure_is_durable_and_addressed(self):
        self.receiver.ingest(self.event('failed'), NOW)
        self.receiver.close()
        self.receiver = Receiver(self.path, self.contract)
        inbox = self.receiver.inbox()
        self.assertEqual(inbox['recipient'], 'test-operator')
        self.assertEqual(inbox['notices'][0]['states'], {'db.restore': 'failed'})
        self.assertEqual(inbox['notices'][0]['kind'], 'unhealthy')
        self.assertTrue(self.receiver.ack(inbox['notices'][0]['id'], NOW)['acknowledged'])
        self.assertEqual(self.receiver.inbox()['notices'], [])

    def test_never_seen_and_stopped_producer_detected(self):
        self.assertEqual(self.receiver.check(NOW)['state'], 'missing-emission')
        self.receiver.check(NOW)
        self.assertEqual(len(self.receiver.inbox()['notices']), 1)
        self.receiver.ingest(self.event(), NOW)
        self.assertEqual(self.receiver.check(NOW)['state'], 'receiving')
        self.assertEqual(self.receiver.check(NOW + timedelta(seconds=901))['state'], 'missing-emission')

    def test_replay_does_not_renew_heartbeat(self):
        event = self.event()
        self.receiver.ingest(event, NOW)
        self.assertEqual(self.receiver.ingest(event, NOW + timedelta(seconds=899))['status'], 'duplicate')
        self.assertEqual(self.receiver.check(NOW + timedelta(seconds=901))['state'], 'missing-emission')
        with self.assertRaises(ValueError):
            self.receiver.ingest(self.event(when=NOW - timedelta(seconds=1)), NOW)

    def test_duplicate_id_changed_payload_rejected(self):
        event = self.event(); self.receiver.ingest(event, NOW)
        event['states']['db.restore'] = 'failed'
        with self.assertRaises(ValueError): self.receiver.ingest(event, NOW)

    def test_invalid_scope_future_stale_and_extra_data(self):
        variants = [dict(producer='other'), dict(states={'other': 'healthy'}),
            dict(states={'db.restore': 'secret'}), dict(password='PRIVATE_CANARY'),
            dict(observed_at=(NOW + timedelta(seconds=1)).isoformat()),
            dict(observed_at=(NOW - timedelta(seconds=901)).isoformat()),
            dict(observed_at='2026-09-06T00:00:00')]
        for variant in variants:
            with self.subTest(variant=variant), self.assertRaises(ValueError):
                self.receiver.ingest(dict(self.event(), **variant), NOW)
        self.assertEqual(self.receiver.inbox()['notices'], [])

    def test_contract_drift_refused(self):
        with self.assertRaises(ValueError): Receiver(self.path, dict(self.contract, recipient='other'))

    def test_retention_keeps_unacknowledged_and_latest_anchors(self):
        self.receiver.ingest(self.event('failed'), NOW)
        self.receiver.ingest(self.event(when=NOW + timedelta(seconds=1)), NOW + timedelta(seconds=1))
        later = NOW + timedelta(days=31)
        self.assertEqual(self.receiver.prune(later)['events_pruned'], 0)
        first = self.receiver.inbox()['notices'][0]['id']
        self.receiver.ack(first, later)
        self.assertEqual(self.receiver.prune(later)['events_pruned'], 1)
        self.assertEqual(self.receiver.check(later)['state'], 'missing-emission')

    def test_duplicate_fields_and_oversize_rejected(self):
        for raw in (b'{"a":1,"a":2}', b' ' * 32769):
            with self.assertRaises(ValueError): strict_json(raw)

    def test_adapter_keeps_time_and_owner_meaning(self):
        report = dict(schema='railiance-platform.assurance-signal.v1',
            cluster_uid='a553c742-0115-43d4-99a4-a5ca56fe0786', evaluated_at=NOW.isoformat(),
            signals={'db.restore': {'state': 'stale', 'owner': 'railiance-platform'}},
            transport='unmonitored', guarantees='unsupported', threshold_status='local-diagnostic-only', healthy=False)
        event = translate(report, self.contract)
        self.assertEqual(event['observed_at'], report['evaluated_at'])
        self.assertEqual(event['states'], {'db.restore': 'stale'})
        report['healthy'] = True
        with self.assertRaises(ValueError): translate(report, self.contract)


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