import os

from tadas.platform import logging as logging_utils

logger = logging_utils.get_file_logger(__file__)

# values can be overridden by environment variables
DEFAULTS = {
    'ENVIRONMENT': 'dev',  # todo: remove from configurable options. Maybe in constants ?
    'REPORT_DATE': '',  # desired report_date in YYYY-MM-DD
    'MODEL_VERSION': 'initial',
    'REQUIRED_DSPS': [],  # check for only these DSPs for availability
    'MAKE_TASKS': ['inference', 'publish'],  # tasks from Makefile to run. Can add "clean"
    'DAYS_BACK': 5,  # number of days back from now to lookup for available data
    'SOURCE_SCHEMA': 'facts.prod.',  # if empty then use default connection schema
    'SOURCE_DB_TYPE': 'reporting',
    'USE_CACHE': False,  # cache SQL results on disk (only for development)
    'CACHE_TTL_MINUTES': 60 * 24,  # default cache TTL
    'SAVE_DAYS_TRENDING': False,
    'TADAS_UPDATE_DYNAMODB_STATUS': False,
    'TADAS_TRIGGER_JENKINS': False,
    'TRENDING_DAYS_LOOKBACK_PERIOD_DAYS': 70,
    'TRENDING_DAYS_UPPER_LIMIT': 30,  # do not publish tracks trending for more than this limit
    'LAUNCHER_RELEASE_LOCK': False,  # force to release existing lock in launcher
    'FORCE_PUBLISH': False,  # force to sync to target tables
    'FRESHNESS_THRESHOLD_HOURS': 74,  # must be synced with freshness interval in https://sonymusic-pde.datadoghq.com/notebook/13556459/tadas-etl
}


def get(setting: str):
    """
    Get configuration setting value.

    :raises KeyError: If the setting name is not recognized.
    """
    try:
        default_value = DEFAULTS[setting]
    except KeyError:
        raise KeyError(f'Unknown configuration setting: {setting}')
    value_type = type(default_value)
    env_value = os.environ.get(setting)
    if env_value is None or env_value == '':
        if value_type == list:
            default_value = default_value.copy()
        result = default_value
    elif value_type == bool:
        if env_value.lower() in ('y', 'yes', 'true'):
            result = True
        elif env_value.lower() in ('n', 'no', 'false'):
            result = False
        else:
            raise ValueError(f'Invalid boolean value: {env_value}')
    elif value_type == int:
        result = int(env_value)
    elif value_type == list:
        result = env_value.split(',')
    elif value_type == str:
        result = env_value
    else:
        raise ValueError(f'Unsupported type: {value_type}')
    logger.info(f'{setting}={result}')
    return result