from __future__ import annotations

import logging
from datetime import UTC, datetime, timedelta

logger = logging.getLogger(__name__)


class HelpScoutPoller:
    def __init__(self, client, mailbox_id: int, poll_interval: int = 30):
        self._client = client
        self._mailbox_id = mailbox_id
        self._poll_interval = poll_interval
        self._last_modification_time: datetime | None = None
        self._running = False

    async def start(self):
        self._running = True
        self._last_modification_time = datetime.now(UTC) - timedelta(minutes=5)
        logger.info(
            "Help Scout poller started: mailbox=%d interval=%ds",
            self._mailbox_id,
            self._poll_interval,
        )

    async def stop(self):
        self._running = False

    async def poll(self) -> list[dict]:
        if not self._running:
            return []

        modified_since = self._last_modification_time.strftime("%Y-%m-%dT%H:%M:%SZ")

        try:
            result = await self._client.list_conversations(
                mailbox=self._mailbox_id,
                status="active",
                modified_since=modified_since,
                embed="threads",
            )
        except Exception:
            logger.exception("Help Scout poller: API call failed")
            return []

        conversations = result.get("_embedded", {}).get("conversations", [])
        messages = []

        for conv in conversations:
            threads = conv.get("_embedded", {}).get("threads", [])
            for thread in threads:
                if thread.get("type") == "customer" and thread.get("status") != "draft":
                    messages.append(
                        {
                            "conversation": conv,
                            "thread": thread,
                        }
                    )

        self._last_modification_time = datetime.now(UTC) - timedelta(seconds=30)

        if messages:
            logger.debug("Help Scout poller: %d new customer messages found", len(messages))

        return messages