# Copyright 2019 3YOURMIND GmbH

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

# http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import hashlib
import os
import pickle

from .utils import split_path


class Cache(dict):
    def __init__(self, django_folder, cache_path):
        self.django_folder = django_folder
        project_name = split_path(django_folder)[-2]
        self.filename = os.path.join(cache_path, "{0}.pickle".format(project_name))

        if not os.path.exists(os.path.dirname(self.filename)):
            os.makedirs(os.path.dirname(self.filename))

        super(Cache, self).__init__()

    def load(self):
        try:
            with open(self.filename, "rb") as f:
                tmp_dict = pickle.load(f)
                self.update(tmp_dict)
        except IOError:
            pass

    def save(self):
        with open(self.filename, "wb") as f:
            pickle.dump(self, f, protocol=2)

    def md5(self, path):
        hash_md5 = hashlib.md5()
        with open(path, "rb") as f:
            for chunk in iter(lambda: f.read(4096), b""):
                hash_md5.update(chunk)
        return hash_md5.hexdigest()