import base64
import logging

import aiohttp
from aiohttp import web

from config import SERVERS

logging.basicConfig(level=logging.DEBUG, format='%(asctime)s - %(levelname)s - %(message)s')
logger = logging.getLogger(__name__)


async def fetch_url_content(url):
    try:
        logger.debug(f"Получение URL: {url}")
        async with aiohttp.ClientSession() as session:
            async with session.get(url, ssl=False) as response:
                if response.status == 200:
                    content = await response.text()
                    logger.debug(f"Успешно получен контент с {url}")
                    return base64.b64decode(content).decode('utf-8').split("\n")  
                else:
                    logger.error(f"Не удалось получить {url}, статус: {response.status}")
                    return [] 
    except Exception as e:
        logger.error(f"Ошибка при получении {url}: {e}")
        return []  


async def combine_unique_lines(urls, query_string):
    all_lines = []
    logger.debug(f"Начинаем объединение подписок для запроса: {query_string}")
    
    urls_with_query = [f"{url}?{query_string}" for url in urls]
    logger.debug(f"Составлены URL-адреса: {urls_with_query}")
    
    for url in urls_with_query:
        lines = await fetch_url_content(url)
        all_lines.extend(lines)
    

    all_lines = list(set(filter(None, all_lines))) 
    logger.debug(f"Объединено {len(all_lines)} строк после фильтрации и удаления дубликатов")
    
    return all_lines

async def handle_subscription(request):
    email = request.match_info['email']
    logger.info(f"Получен запрос на подписку для email: {email}")

    urls = []
    for server in SERVERS.values():
        server_subscription_url = f"{server['SUBSCRIPTION']}/{email}"
        urls.append(server_subscription_url)
    
    query_string = request.query_string
    logger.debug(f"Извлечен query string: {query_string}")
    
    combined_subscriptions = await combine_unique_lines(urls, query_string)
    
    base64_encoded = base64.b64encode("\n".join(combined_subscriptions).encode('utf-8')).decode('utf-8')
    
    headers = {
        'Content-Type': 'text/plain; charset=utf-8',
        'Content-Disposition': 'inline',  
        'profile-update-interval': '7', 
        'profile-title': email,  
    }

    logger.info(f"Возвращаем объединенные подписки для email: {email}")
    return web.Response(text=base64_encoded, headers=headers)