import re
import logging
import uuid
import requests

from alerts.rooms import HOMESERVER, ACCESS_TOKEN, get_room_id
from alerts.utils import strip_html

logger = logging.getLogger(__name__)

MAX_MATRIX_SIZE = 30000


def send_matrix(text, channel="default"):
    if len(text) > MAX_MATRIX_SIZE:
        text = text[:MAX_MATRIX_SIZE] + "\n\n... (truncated)"

    room_id = get_room_id(channel)
    txn = uuid.uuid4().hex
    url = f"{HOMESERVER}/_matrix/client/v3/rooms/{room_id}/send/m.room.message/{txn}"

    payload = {
        "msgtype": "m.text",
        "format": "org.matrix.custom.html",
        "formatted_body": text.replace("\n", "<br>"),
        "body": strip_html(text)
    }
    headers = {
        "Authorization": f"Bearer {ACCESS_TOKEN}",
        "User-Agent": "grafana-matrix-relay/1.0"
    }
    try:
        r = requests.put(url, json=payload, headers=headers, timeout=10)
        if not r.ok:
            logger.error("Matrix error: %s %s", r.status_code, r.text)
    except Exception as e:
        logger.exception("Error sending Matrix message")