#!/usr/bin/env python3
import json
import os
import time

import nebula_rss


if __name__ == '__main__':
    config = {}
    config_file_path = 'config.json'
    with open(config_file_path) as config_file:
        config = json.load(config_file)
    loader = nebula_rss.nebula_loader.NebulaLoader(
        username=config['username'],
        password=config['password'],
        driver_path=config.get('driver_path', None)
    )
    current_ts = time.time()
    last_generation_time = config.get('last_generated_ts', 0)
    feed_cache_time_seconds = config.get('feed_cache_time_seconds', 3600)
    time_since_last_generation = current_ts - last_generation_time
    output_file_exists = os.path.isfile(config['output_file'])
    if (time_since_last_generation <= feed_cache_time_seconds
            and output_file_exists):
        exit(0)
    feed = nebula_rss.NebulaFeed(
        nebula_loader=loader,
        feed_url=config['feed_url'])
    # generates bytes, not string for whatever reason
    with open(config['output_file'], 'wb') as output_file:
        output_file.write(feed.generate())
    last_generation_time = config['last_generated_ts'] = current_ts
    with open(config_file_path, 'w') as config_file:
        json.dump(config, config_file, indent=4)