"""Definition of the Trip class."""

import uuid
from pydantic import BaseModel, Field
from pymemcache.client.base import Client

from .linked_landmarks import LinkedLandmarks


class Trip(BaseModel):
    """"
    A Trip represents the final guided tour that can be passed to frontend.

    Attributes:
        uuid: unique identifier for this particular trip.
        total_time: duration of the trip (in minutes).
        first_landmark_uuid: unique identifier of the first Landmark to visit.

    Methods:
        from_linked_landmarks: create a Trip from LinkedLandmarks object.
    """
    uuid: str = Field(default_factory=uuid.uuid4)
    total_time: int
    first_landmark_uuid: str


    @classmethod
    def from_linked_landmarks(cls, landmarks: LinkedLandmarks, cache_client: Client) -> "Trip":
        """
        Initialize a new Trip object and ensure it is stored in the cache.
        """
        trip = Trip(
            total_time = landmarks.total_time,
            first_landmark_uuid = str(landmarks[0].uuid)
        )

        # Store the trip in the cache
        cache_client.set(f"trip_{trip.uuid}", trip)

        # Make sure to await the result (noreply=False).
        # Otherwise the cache might not be inplace when the trip is actually requested.
        cache_client.set_many({f"landmark_{landmark.uuid}": landmark for landmark in landmarks},
                              expire=3600, noreply=False)
        # is equivalent to:
        # for landmark in landmarks:
        #     cache_client.set(f"landmark_{landmark.uuid}", landmark, expire=3600)

        return trip