# Изменено: 2026-03-14
# event-writer: простая HTTP функция без внешних зависимостей.
# Правка поля response_tag в коде сразу видна в ответе после terraform apply.

import json
import os
from datetime import datetime, timezone


def event_writer_handle(event_writer_event):
    """Возвращает полезный JSON-ответ для визуальной проверки выката кода."""
    writer_default_message = os.environ.get("DEFAULT_MESSAGE", "writer-default")

    writer_payload = event_writer_event if isinstance(event_writer_event, dict) else {}

    writer_message_value = writer_payload.get("message", writer_default_message)
    writer_source_name = writer_payload.get("source", "event-writer")
    writer_generated_at = datetime.now(timezone.utc).isoformat()

    # response_tag удобно менять для демонстрации hot-update кода через terraform apply.
    writer_response_tag = "writer-v2"
    return {
        "ok": True,
        "source": writer_source_name,
        "message": writer_message_value,
        "response_tag": writer_response_tag,
        "generated_at": writer_generated_at,
    }