from typing import Any, Dict, Optional
from datetime import datetime

CRITICAL = "Critical"
WARNING = "Warning"


class Alert:
    start_time: datetime
    last_time: datetime
    end_time: Optional[datetime]
    id: str
    title: str
    description: str
    module: str
    severity: str

    @property
    def ui_class(self) -> str:
        if self.severity == CRITICAL:
            return "danger"
        if self.severity == WARNING:
            return "warning"
        return "info"

    # This alert has happened again.
    def reoccured(self):
        self.last_time = datetime.now()
        self.end_time = None

    # This alert has finished, just update end time and keep last_time.
    def cleared(self):
        self.end_time = datetime.now()

    @property
    def __dict__(self):
        attrs = ["start_time", "last_time", "end_time", "id", "title", "description", "module", "severity"]
        out = {}
        for attr in attrs:
            out[attr] = self.__getattribute__(attr)

        return out

    def __init__(self, new_data: Dict[str, Any]):
        required_vars = [
            "start_time",  # Just in case an alert wants to show starting earlier than it is reported.
            "id",
            "title",
            "description",
            "module",
            "severity"
        ]

        for key in required_vars:
            if key not in new_data.keys():
                raise KeyError("Key {} is missing from data to create Alert.".format(key))

            # if type(new_data[key]) != type(getattr(self,key)):
            #  raise TypeError("Key {} has type {}, was expecting {}."
            #   .format(key, type(new_data[key]), type(getattr(self,key))))

            # Account for if the creator didn't want to set a custom time.
            if key == "start_time" and new_data[key] == -1:
                new_data[key] = datetime.now()

            setattr(self, key, new_data[key])

        self.last_time = self.start_time
        self.end_time = None