from datetime import datetime
from enum import Enum
from flask.views import MethodView
import marshmallow as ma

from app import Application
from . import routes as blp

instance = Application.get_instance()

class HealthStatus(Enum):
    OK = 0
    WARNING = 1
    ERROR = 2
    CRITICAL = 3

class HealthGet(ma.Schema):
    alive_since = ma.fields.String()
    alive_for = ma.fields.String()
    status = ma.fields.Enum(HealthStatus, type=ma.fields.String)

@blp.route("/health")
class ApiVersion(MethodView):
    @blp.doc(summary="Returns the status and alive-time of the server")
    @blp.response(200, HealthGet, description="Successful operation")
    def get(self):
        response = {
            "alive_since": datetime.strftime(instance.alive_since, "%d.%m.%Y %H:%M:%S"),
            "alive_for": str(datetime.now() - instance.alive_since),
            "status": HealthStatus.OK
        }
        return response