"""Logic for ddex generation check."""

import requests
import config

from typing import Tuple


DDEX_OK = 'DDEX_CHECK_SUCCESS'
DDEX_WARN = 'DDEX_CHECK_WARN'
DDEX_ERROR = 'DDEX_CHECK_ERROR'
DDEX_UNKNOWN = 'DDEX_CHECK_UNKNOWN'


def check_ddex_generation(upc: int) -> Tuple[str, str]:
    """Check if DDEX generation is successful for given UPC.

    Args:
        upc: UPC to check DDEX generation for.

    Returns:
        DDEX Response Status, DDEX Response Info
        - DDEX_OK if DDEX generation is successful for given UPC
        - DDEX_WARN if DDEX generation is unsuccesful for reasons other
            than product metadata
        - DDEX_ERROR if generation is unsuccessful and not DDEX_WARN
        - DDEX_UNKNOWN if DDEX response is empty
    """
    for url in config.DDEX_GENERATION_URLS:
        response = requests.get(url.format(upc=upc))
        if response.status_code == 200:
            return (DDEX_OK, 'SUCCESS')
        if response.status_code == 500 and \
                any(err in response.text for err in config.DDEX_ERRORS_TO_IGNORE):
            return (DDEX_WARN, response.text)
        if response.status_code == 500 and not response.text:
            # Temporary DDEX unavailability
            return (DDEX_UNKNOWN, response.text)
    return (DDEX_ERROR, response.text)