# Any alerts produced by the server.py layer. This likely means BIG issues.
import json
from typing import Any, Dict, List
from datetime import datetime, timedelta
from helpers.os_environment import resolve_external_file_path
from helpers.alert_manager import AlertProvider
from baps_types.alert import CRITICAL, WARNING, Alert
from baps_types.happytime import happytime

MODULE = "BAPSicleServer"  # This should match the log file, so the UI will link to the logs page.


class ServerAlertProvider(AlertProvider):

    _state: Dict[str, Any]
    # To simplify monitoring (and allow detection of things going super
    # weird), we are going to read from the state file to work out the alerts.

    def get_alerts(self):
        with open(resolve_external_file_path("state/BAPSicleServer.json")) as file:
            self._state = json.loads(file.read())

        funcs = [self._api_key, self._start_time]

        alerts: List[Alert] = []

        for func in funcs:
            func_alerts = func()
            if func_alerts:
                alerts.extend(func_alerts)

        return alerts

    def _api_key(self):
        if not self._state["myradio_api_key"]:
            return [Alert({
                "start_time": -1,  # Now
                "id": "api_key_missing",
                "title": "MyRadio API Key is not configured.",
                "description": "This means you will be unable to load show plans, audio items, or tracklist. \
                    Please set one on the 'Server Config' page.",
                "module": MODULE,
                "severity": CRITICAL
            })]

        if len(self._state["myradio_api_key"]) < 10:
            return [Alert({
                "start_time": -1,
                "id": "api_key_missing",
                "title": "MyRadio API Key seems incorrect.",
                "description": "The API key is less than 10 characters, it's probably not a valid one. \
                    If it is valid, it shouldn't be.",
                "module": MODULE,
                "severity": WARNING
            })]

    def _start_time(self):
        start_time = self._state["start_time"]
        start_time = datetime.fromtimestamp(start_time)
        delta = timedelta(
            days=1,
        )
        if (start_time + delta > datetime.now()):
            return [Alert({
                "start_time": -1,
                "id": "server_restarted",
                "title": "BAPSicle restarted recently.",
                "description":
                """The BAPSicle server restarted at {}, less than a day ago.

It may have been automatically restarted by the OS.

If this is not expected, please check logs to investigate why BAPSicle restarted/crashed."""
                .format(happytime(start_time)),
                "module": MODULE,
                "severity": WARNING
            })]