"""Shared Telegram notifier for the fulfillment workers.

One place to send operator notifications so every worker/handler reports the
same way (and we can change transport once). Fire-and-forget: a Telegram outage
must never break fulfillment.

Env: TELEGRAM_BOT_TOKEN, TELEGRAM_CHAT_ID.
"""
from __future__ import annotations

import json
import logging
import os
import urllib.request

LOG = logging.getLogger("workers.telegram_notify")


def telegram_enabled() -> bool:
    return bool(os.getenv("TELEGRAM_BOT_TOKEN") and os.getenv("TELEGRAM_CHAT_ID"))


def send_telegram(text: str, *, parse_mode: str | None = None) -> bool:
    """Send a Telegram message. Returns True on success, never raises.

    Safe to call from any worker; no-ops (returns False) if not configured.
    """
    bot_token = os.getenv("TELEGRAM_BOT_TOKEN", "")
    chat_id = os.getenv("TELEGRAM_CHAT_ID", "")
    if not bot_token or not chat_id:
        return False
    try:
        payload: dict = {"chat_id": chat_id, "text": text}
        if parse_mode:
            payload["parse_mode"] = parse_mode
        data = json.dumps(payload).encode()
        req = urllib.request.Request(
            f"https://api.telegram.org/bot{bot_token}/sendMessage",
            data=data,
            headers={"Content-Type": "application/json"},
        )
        urllib.request.urlopen(req, timeout=10)  # nosec - trusted Telegram API
        return True
    except Exception as exc:  # never break fulfillment on a notify failure
        LOG.warning("Telegram notify failed: %s", exc)
        return False


def create_admin_todo(
    *,
    title: str,
    order_number: str,
    service_slug: str,
    description: str,
    data: dict | None = None,
    category: str = "filing",
    priority: str = "normal",
    notify: bool = True,
) -> bool:
    """Insert an admin_todos row AND fire an operator Telegram alert.

    Single source of truth for fulfillment-task creation so every worker both
    persists the task and notifies the operator. The insert and the notify are
    independent: a notify failure never blocks the task, and a DB failure is
    logged (returns False) without raising.

    Column order matches the shared admin_todos schema used across handlers:
    (title, category, priority, order_number, service_slug, description, data, status).
    """
    ok = False
    try:
        import psycopg2  # local import: keep module importable without psycopg2

        conn = psycopg2.connect(os.environ.get("DATABASE_URL", ""))
        try:
            with conn.cursor() as cur:
                cur.execute(
                    """
                    INSERT INTO admin_todos (
                        title, category, priority, order_number, service_slug,
                        description, data, status
                    ) VALUES (%s, %s, %s, %s, %s, %s, %s, 'pending')
                    """,
                    (
                        title, category, priority, order_number, service_slug,
                        description, json.dumps(data or {}),
                    ),
                )
            conn.commit()
            ok = True
        finally:
            conn.close()
    except Exception as exc:
        LOG.error("create_admin_todo failed for %s/%s: %s", order_number, service_slug, exc)
        return False

    if notify:
        notify_fulfillment_todo(
            title=title,
            order_number=order_number,
            service_slug=service_slug,
            priority=priority,
            description=description,
        )
    return ok


def notify_fulfillment_todo(
    *,
    title: str,
    order_number: str,
    service_slug: str,
    priority: str = "normal",
    description: str = "",
) -> bool:
    """Operator alert that a fulfillment task needs attention.

    Called whenever an admin_todo is created so nothing waits unseen in the
    queue. The description is trimmed to keep the message readable.
    """
    icon = {"high": "🔴", "urgent": "🔴", "normal": "🟡", "low": "⚪"}.get(
        (priority or "normal").lower(), "🟡"
    )
    desc = (description or "").strip()
    if len(desc) > 600:
        desc = desc[:600] + "…"
    text = (
        f"{icon} FULFILLMENT NEEDED\n\n"
        f"{title}\n"
        f"Service: {service_slug}\n"
        f"Order: {order_number}\n"
        f"Priority: {priority}\n"
    )
    if desc:
        text += f"\n{desc}"
    return send_telegram(text)