# Copyright © 2024 Nicole O'Connor
# 
# 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 atexit
import logging
import os
import pathlib
import time

import requests

import config
import screen

log = logging.getLogger("blocklists")
running = True

blocklist_data_src = "https://github.com/hagezi/dns-blocklists/archive/refs/heads/main.zip"
blocklist_data_src_path = "dnsmasq"
blocklist_lib_path = "/var/lib/starcontrol"

log.debug("preparing cache directories")
pth_cache_root = pathlib.Path(config.cparse["internal"]["cache_root"])
pth_cache_root.mkdir(exist_ok=True, parents=True)
pth_blocklist_lib = pathlib.Path(blocklist_lib_path)
pth_blocklist_lib.mkdir(exist_ok=True, parents=True)

def blocklist_check():
    log.debug("checking blocklist mtimes and updating if needed")
    try:
        ts_payload = os.path.getmtime(pth_blocklist_lib / "dns-blocklists-main.zip")
        ts_now = time.time()
        if (ts_now - ts_payload) >= 604800:
            update_blocklists()
    except OSError:
        update_blocklists()

def update_blocklists():
    log.info("blocklist update in progress")
    screen.download_state = 1

    fd_listpayload = open(pth_blocklist_lib / "dns-blocklists-main.zip", "wb")
    hnd_download = requests.get(blocklist_data_src, stream=True)

    for chunk in hnd_download.iter_content(chunk_size=256):
        fd_listpayload.write(chunk)

    hnd_download.close()
    fd_listpayload.close()
    screen.download_state = 0

def blocklist_thread():
    while running:
        blocklist_check()
        time.sleep(3600) # 1 hour

@atexit.register
def stop_blocklist():
    global running
    running = False