from __future__ import annotations

import httpx

from ...redaction import redact
from .base import DeliveryResult
from .http import classify_response


def _format_message(event_type: str, payload: dict) -> str:
    icon = "[FIRING]" if event_type == "firing" else "[RESOLVED]"
    sev = payload.get("severity", "unknown")
    agent = payload.get("agent_id", "?")
    check = payload.get("check_id", "?")
    status = payload.get("status", "?")
    incident_key = payload.get("incident_key", "?")
    output = payload.get("output") or ""
    lines = [
        f"{icon} {sev} {agent}/{check}",
        f"status: {status}",
        f"incident_key: {incident_key}",
        f"observed_at: {payload.get('observed_at', '?')}",
    ]
    if output:
        lines.append(f"output: {output[:300]}")
    return redact("\n".join(lines)) or ""


class TelegramNotifier:
    name = "telegram"

    def __init__(self, client: httpx.AsyncClient, token: str, chat_id: str) -> None:
        self._client = client
        self._token = token
        self._chat_id = chat_id

    async def deliver(self, event_type: str, payload: dict) -> DeliveryResult:
        url = f"https://api.telegram.org/bot{self._token}/sendMessage"
        body = {"chat_id": self._chat_id, "text": _format_message(event_type, payload)}
        try:
            resp = await self._client.post(url, json=body)
        except httpx.HTTPError as exc:
            return DeliveryResult(ok=False, permanent=False, error=type(exc).__name__)
        ok, perm = classify_response(resp.status_code)
        if ok:
            return DeliveryResult(ok=True)
        return DeliveryResult(ok=False, permanent=perm, error=f"http_{resp.status_code}")