from __future__ import annotations

import os
import uuid
from datetime import datetime, timezone

import pytest
from sqlalchemy import create_engine, text
from sqlalchemy.orm import Session

from app.core.events.consumer import dispatch_event
from app.core.events.outbox import (
    apply_dispatch_result,
    claim_outbox,
    consumed,
    enqueue_outbox,
)


pytestmark = pytest.mark.integration


@pytest.fixture()
def database_url():
    value = os.environ.get("TEST_DATABASE_URL")
    if not value:
        pytest.skip("TEST_DATABASE_URL is not configured")
    return value


def test_command_and_event_rollback_atomically(database_url):
    engine = create_engine(database_url)
    marker = uuid.uuid4().hex
    event_id = None
    try:
        with Session(engine) as session:
            with pytest.raises(RuntimeError, match="force rollback"):
                with session.begin():
                    session.execute(
                        text(
                            "INSERT INTO public.task_list "
                            "(task_name, task_description, create_by) "
                            "VALUES (:name, 'atomic test', 'pytest')"
                        ),
                        {"name": marker},
                    )
                    event_id = enqueue_outbox(
                        session,
                        aggregate_type="test_task",
                        aggregate_id=marker,
                        event_type="test.created",
                        payload={"marker": marker},
                    )
                    raise RuntimeError("force rollback")

        with engine.connect() as connection:
            task_count = connection.execute(
                text("SELECT COUNT(*) FROM public.task_list WHERE task_name = :name"),
                {"name": marker},
            ).scalar_one()
            event_count = connection.execute(
                text(
                    "SELECT COUNT(*) FROM public.outbox_events "
                    "WHERE event_id = CAST(:event_id AS uuid)"
                ),
                {"event_id": event_id},
            ).scalar_one()
        assert task_count == 0
        assert event_count == 0
    finally:
        engine.dispose()


def test_downstream_failure_recovers_and_restart_does_not_duplicate(database_url):
    engine = create_engine(database_url)
    marker = uuid.uuid4().hex
    delivered = []
    try:
        with Session(engine) as session:
            event_id = enqueue_outbox(
                session,
                aggregate_type="governance_object",
                aggregate_id=marker,
                event_type="governance.updated",
                payload={"marker": marker},
            )
            session.commit()

        with Session(engine) as session:
            event = claim_outbox(session, limit=1)[0]
            result = dispatch_event(
                event,
                lambda _payload: (_ for _ in ()).throw(
                    ConnectionError("downstream unavailable")
                ),
                max_attempts=3,
                now=datetime.now(timezone.utc),
            )
            apply_dispatch_result(
                session,
                consumer_name="integration-consumer",
                event=event,
                result=result,
            )
            session.commit()

        with Session(engine) as session:
            session.execute(
                text(
                    "UPDATE public.outbox_events "
                    "SET available_at = CURRENT_TIMESTAMP "
                    "WHERE event_id = CAST(:event_id AS uuid)"
                ),
                {"event_id": event_id},
            )
            session.commit()

        # A fresh Session represents a consumer restart.
        with Session(engine) as session:
            event = claim_outbox(session, limit=1)[0]
            result = dispatch_event(event, lambda payload: delivered.append(payload))
            apply_dispatch_result(
                session,
                consumer_name="integration-consumer",
                event=event,
                result=result,
            )
            session.commit()

        with Session(engine) as session:
            session.execute(
                text(
                    "UPDATE public.outbox_events "
                    "SET status = 'pending', available_at = CURRENT_TIMESTAMP "
                    "WHERE event_id = CAST(:event_id AS uuid)"
                ),
                {"event_id": event_id},
            )
            session.commit()

        duplicate_calls = []
        with Session(engine) as session:
            event = claim_outbox(session, limit=1)[0]
            result = dispatch_event(
                event,
                lambda payload: duplicate_calls.append(payload),
                already_processed=consumed(
                    session, "integration-consumer", event.event_id
                ),
            )
            apply_dispatch_result(
                session,
                consumer_name="integration-consumer",
                event=event,
                result=result,
            )
            session.commit()

        assert delivered == [{"marker": marker}]
        assert duplicate_calls == []
        with engine.connect() as connection:
            row = connection.execute(
                text(
                    "SELECT status, attempts FROM public.outbox_events "
                    "WHERE event_id = CAST(:event_id AS uuid)"
                ),
                {"event_id": event_id},
            ).one()
            assert row[0] == "published"
            assert row[1] == 2
    finally:
        with engine.begin() as connection:
            connection.execute(
                text(
                    "DELETE FROM public.outbox_consumptions "
                    "WHERE event_id IN (SELECT event_id FROM public.outbox_events "
                    "WHERE aggregate_id = :marker)"
                ),
                {"marker": marker},
            )
            connection.execute(
                text("DELETE FROM public.outbox_events WHERE aggregate_id = :marker"),
                {"marker": marker},
            )
        engine.dispose()