"""In-process idempotent event delivery for the v3 delivery boundary."""

from __future__ import annotations

from copy import deepcopy
from typing import Any


class IdempotentInProcessPublisher:
    """A small delivery adapter with durable-outbox compatible semantics.

    The process-local sink is intentionally only a delivery mechanism: SQLite
    remains the durable event source.  The event ID is retained so a later
    durable broker/websocket adapter can make the same idempotency guarantee.
    """

    def __init__(self) -> None:
        self._seen_event_ids: set[int] = set()
        self.delivered: list[dict[str, Any]] = []

    async def publish(self, event: dict[str, Any]) -> None:
        event_id = event.get("event_id")
        if not isinstance(event_id, int):
            raise ValueError("Published outbox event has no integer event_id")
        if event_id in self._seen_event_ids:
            return
        self._seen_event_ids.add(event_id)
        self.delivered.append(deepcopy(event))