from pathlib import Path
from model.TimeSlot import TimeSlot
import json


class DataStore:
    def __init__(self, filename: Path, create=False):
        self._filename = filename
        if create:
            # Store emtpty list
            self._time_slots = []
            self.write_update()
        else:
            # Load dicts from file
            with open(self._filename, "r") as f:
                self._time_slots = list(json.load(f))

            # Convert dicts into TimeSlot objects
            def deserialize(d: dict) -> TimeSlot:
                ts = TimeSlot.__new__(TimeSlot)  # Create a new, empty instance
                ts.__dict__.update(d)
                return ts

            self._time_slots = [deserialize(d) for d in self._time_slots]

    def write_update(self):
        """Saves the updates made to the DataStore object to disk."""
        with open(self._filename, "w+") as f:
            json.dump(self._time_slots, f, default=vars)

    def add_time_slot(self, time_slot: TimeSlot):
        self._time_slots.append(time_slot)

    def remove_time_slot(self, time_slot: TimeSlot):
        self._time_slots.remove(time_slot)

    def get_all_time_slots(self) -> list[TimeSlot]:
        return self._time_slots[:]