"""
Redis-based ID resolution and caching helpers for Aether.
"""
import datetime
import random
import redis
import logging

from app.config import settings

log = logging.getLogger(__name__)

def redis_lookup_id_random(
        record_id_random: int|str,
        table_name: str,
        check_int_id: bool = False,
        log_lvl: int = logging.WARNING, # DEBUG, INFO, WARNING, ERROR, EXCEPTION, CRITICAL
        minutes: int = 30, # Expire the Redis key after 8 minutes
        reset_rate: int = 10, # 1 in 10 chance of resetting the Redis key
        ) -> str|int|bool|None:
    """
    Looks up a record ID in Redis, falling back to SQL if not found.
    Resolves 'id_random' (URL-safe string) to internal integer 'id'.
    """
    from app.db_sql import sql_select, get_id_random
    log.setLevel(log_lvl)

    if isinstance(record_id_random, str) and len(record_id_random) >= 11 and len(record_id_random) <= 22: pass
    elif isinstance(record_id_random, int):
        record_id = record_id_random
        if check_int_id:
            log.info(f'Checking the int ID if exists. Table Name: {table_name} ID: {record_id}')
            if get_id_random_result := get_id_random(
                    record_id = record_id,
                    table_name = table_name,
                    ):
                log.info(f'The int ID exists. Returning the int ID. ID Random: {get_id_random_result}')
                return record_id
            else:
                log.info(f'The int ID does not exists. Returning False. Table Name: {table_name} ID: {record_id}')
                return False
        else:
            log.debug(f'Not checking if the int ID exists. Returning the int ID. ID: {record_id}')
            return record_id
    elif record_id_random is None:
        log.info(f'No record ID was passed. Returning None')
        return None
    else:
        log.error(f'Unexpected data type or string format: {type(record_id_random)} Expected type is a string 11 or 22 characters long.')
        return False

    if record_id_random and table_name:
        if len(record_id_random) < 11:
            log.error(f'The length of id_random is too short: {record_id_random} ({len(record_id_random)} chars)')
            return False
        elif len(record_id_random) > 22:
            log.error(f'The length of id_random is too long: {record_id_random} ({len(record_id_random)} chars)')
            return False
    elif record_id_random:
        log.error(f'Missing table_name to select from for id_random "{record_id_random}"')
        return False
    elif table_name:
        log.error(f'Missing id_random to select from table "{table_name}"')
        return False
    else:
        log.error('Missing table_name and record_id_random')
        return False

    r = redis.Redis(host=settings.REDIS['server'], port=settings.REDIS['port'], db=7, password=None, decode_responses=True)
    key_name = f'{table_name}:{record_id_random}'

    record_id = r.get(key_name)

    if record_id and random.randint(1, reset_rate) == 1:
        log.warning(f'Redis: Randomly (1/{reset_rate}) setting record_id to None. Key="{key_name}" value="{record_id}" TTL={r.ttl(key_name)} seconds')
        record_id = None

    if record_id:
        r.setex(key_name, datetime.timedelta(minutes=minutes), value=record_id)
        log.info(f'Redis: Entry found for: Key="{key_name}" value="{record_id}" TTL={r.ttl(key_name)} seconds')
        return int(record_id)
    elif table_name:
        data = { 'id_random': record_id_random }
        sql = f"SELECT id FROM `{table_name}` AS `table` WHERE `table`.id_random = :id_random;"

        if select_results := sql_select(sql=sql, data=data):
            log.debug(f'SQL: SELECT result: {select_results}')
            if isinstance(select_results, dict):
                log.info(f"""SQL: Found ID Random for: {str(record_id_random)} = {str(select_results.get('id'))}""")
                if rid := select_results.get('id'):
                    r.setex(key_name, datetime.timedelta(minutes=minutes), value=rid)
                    return int(rid)
                else:
                    log.error('The SQL result was not what was expected. The ID field was not found.')
                    return False
            else:
                log.error(f'SQL: More than one record found in "{table_name}". Duplicate id_random!')
                return redis_lookup_id_random(record_id_random=record_id_random, table_name=table_name)
        else:
            log.warning(f'SQL: ID Random "{record_id_random}" not found in "{table_name}". Returning None.')
            return None

    log.error('Unexpected state in redis_lookup_id_random.')
    return False


def get_id_random(
        record_id: int,
        table_name: str,
        log_lvl: int = logging.WARNING, # DEBUG, INFO, WARNING, ERROR, EXCEPTION, CRITICAL
        ) -> str|bool|None:
    """
    Looks up the 'id_random' for a given internal integer ID.
    """
    from app.db_sql import sql_select
    log.setLevel(log_lvl)

    data = { 'id': record_id }
    sql = f"SELECT id_random FROM `{table_name}` AS `table` WHERE `table`.id = :id;"

    if select_results := sql_select(sql=sql, data=data):
        if isinstance(select_results, dict):
            if record_id_random := select_results.get('id_random'):
                return str(record_id_random)
            else:
                log.error('The SQL result was not what was expected.')
                return False
        elif isinstance(select_results, list):
            log.exception('More than one record may have been found. Duplicate ID!')
            return False
        else:
            log.exception(f'Got an unexpected result while trying to look up the ID.')
            return False
    elif select_results is None:
        return None
    else:
        return False


def reset_redis():
    """Flushes the Redis database used for ID caching."""
    r = redis.Redis(host=settings.REDIS['server'], port=settings.REDIS['port'], db=7, password=None, decode_responses=True)
    r.flushdb()
    return True