import json
import os.path

from app import cache_path


class Upc(object):

    def __init__(self, upc):
        self.upc = upc
        self.filename = os.path.join(cache_path, upc)

    @property
    def data(self):
        """Get data for a UPC. Using cache if needed.

        Returns:
            dict or None if data does not exist.
        """

        if os.path.exists(self.filename):
            return json.load(open(self.filename, encoding='utf8'))
        else:
            return None

    def cache_data(self, data):
        """Cached the data for a UPC.

        Args:
            data (dict): UPC related data to store.
        """

        with open(self.filename, mode='w', encoding='utf8') as fh:
            json.dump(data, fh)