import os
import time

import requests
import telegram
import logging
from dotenv import load_dotenv

load_dotenv()

logging.basicConfig(
    level=logging.DEBUG,
    filename='program.log',
    filemode='a',
)

PRAKTIKUM_TOKEN = os.getenv('PRAKTIKUM_TOKEN')
TELEGRAM_TOKEN = os.getenv('TELEGRAM_TOKEN')
TELEGRAM_CHAT_ID = os.getenv('TELEGRAM_CHAT_ID')
HEADERS = {
    'Authorization': f'OAuth {PRAKTIKUM_TOKEN}'
}


def parse_homework_status(homework):
    homework_name = homework.get('homework_name')
    homework_status = homework.get('status')
    if homework_name is None:
        return 'Невозможно определить имя работы'
    if homework_status is None:
        return 'Невозможно определить статус работы'
    if homework_status != 'approved':
        verdict = 'К сожалению в работе нашлись ошибки.'
    else:
        verdict = ('Ревьюеру всё понравилось, '
                   'можно приступать к следующему уроку.')
    return f'У вас проверили работу "{homework_name}"!\n\n{verdict}'


def get_homework_statuses(current_timestamp):
    if current_timestamp is None:
        current_timestamp = int(time.time())
    params = {
        'from_date': current_timestamp
    }
    try:
        homework_statuses = requests.get(
            'https://praktikum.yandex.ru/api/user_api/homework_statuses/',
            params=params,
            headers=HEADERS,
        )
    except requests.RequestException as e:
        logging.error('Error at %s', 'status', exc_info=e)
    return homework_statuses.json()


def send_message(message, bot_client):
    logging.info('Отправлено сообщение')
    try:
        return bot_client.send_message(chat_id=TELEGRAM_CHAT_ID, text=message,)
    except Exception as e:
        logging.error('Error at %s', 'send_message', exc_info=e)


def main():
    bot = telegram.Bot(token=TELEGRAM_TOKEN)
    current_timestamp = int(time.time())
    while True:
        try:
            new_homework = get_homework_statuses(current_timestamp)
            if new_homework.get('homeworks'):
                send_message(parse_homework_status(
                    new_homework.get('homeworks')[0]),
                    bot
                )
            current_timestamp = new_homework.get(
                'current_date',
                current_timestamp,
            )
            time.sleep(900)

        except Exception as e:
            print(f'Бот столкнулся с ошибкой: {e}')
            time.sleep(5)


if __name__ == '__main__':
    main()