"""Admin alert when DubLab runs out of Gemini quota.

Sends one Telegram message via @mzbanx_bot to the BOT ERROR REPORT &
REQUEST group, then stays quiet for COOLDOWN seconds so a queue full of
failing jobs can't spam the group. A successful job re-arms it.
Token/chat come from .env: DUBLAB_ALERT_BOT_TOKEN, DUBLAB_ALERT_CHAT_ID.
Only stdlib is used.
"""
import json
import os
import time
import urllib.request

COOLDOWN = 3 * 3600
_last = 0.0


def _send(text):
    token = os.environ.get("DUBLAB_ALERT_BOT_TOKEN", "")
    chat = os.environ.get("DUBLAB_ALERT_CHAT_ID", "")
    if not token or not chat:
        return False
    body = json.dumps({"chat_id": chat, "text": text}).encode()
    req = urllib.request.Request(
        f"https://api.telegram.org/bot{token}/sendMessage",
        data=body, headers={"Content-Type": "application/json"})
    try:
        with urllib.request.urlopen(req, timeout=15) as r:
            return r.status == 200
    except Exception:  # noqa: BLE001 - an alert must never break a job
        return False


def quota_alert(where, detail):
    """Alert once per cooldown window. Returns True if a message went out."""
    global _last
    now = time.time()
    if now - _last < COOLDOWN:
        return False
    _last = now
    text = ("⚠️ DubLab — Gemini quota ပြည့်ပြီ\n"
            f"နေရာ: {where}\n"
            f"အသေးစိတ်: {detail[:200]}\n"
            "ဒီကာလအတွင်း dub job တွေ fail နေနိုင်တယ် — quota ပြန်ရရင် "
            "အလိုလို ပြန်ကောင်းမယ်။ နောက် ၃ နာရီအတွင်း ထပ် alert မပို့ဘူး")
    return _send(text)


def quota_ok():
    """A job succeeded — quota is back, re-arm the alert."""
    global _last
    _last = 0.0