import logging
from pydantic_settings import BaseSettings ,SettingsConfigDict
from pydantic import Field ,field_validator ,ValidationError
from typing import Optional ,List ,Dict ,Any

class Settings (BaseSettings ):
    BOT_TOKEN :str
    ADMIN_IDS_STR :str =Field (default ="",alias ="ADMIN_IDS",description ="Comma-separated list of admin Telegram User IDs")

    DB_NAME :str =Field (default ="bot_database.sqlite3")
    DEFAULT_LANGUAGE :str =Field (default ="ru")
    DEFAULT_CURRENCY_SYMBOL :str =Field (default ="RUB")

    SUPPORT_LINK :Optional [str ]=Field (default =None ,description ="Link to support contact (e.g., t.me/your_support_contact)")
    SERVER_STATUS_URL :Optional [str ]=Field (default =None ,description ="Link to server status page (e.g., Uptime Kuma)")


    YOOKASSA_SHOP_ID :Optional [str ]=None
    YOOKASSA_SECRET_KEY :Optional [str ]=None
    YOOKASSA_WEBHOOK_BASE_URL :Optional [str ]=None
    YOOKASSA_RETURN_URL :Optional [str ]=None

    YOOKASSA_DEFAULT_RECEIPT_EMAIL :Optional [str ]=Field (default =None ,description ="Default email for YooKassa receipts (REQUIRED for 54-FZ)")
    YOOKASSA_VAT_CODE :int =Field (default =6 ,description ="YooKassa VAT code (e.g., 1=20%, 2=10%, 4=0%, 6=No VAT - check YooKassa docs!)")
    YOOKASSA_PAYMENT_MODE :str =Field (default ="full_prepayment",description ="YooKassa payment mode (e.g., full_prepayment, full_payment)")
    YOOKASSA_PAYMENT_SUBJECT :str =Field (default ="service",description ="YooKassa payment subject (e.g., service, commodity)")


    TELEGRAM_WEBHOOK_BASE_URL :Optional [str ]=None


    PRICE_1_MONTH :Optional [int ]=None
    PRICE_3_MONTHS :Optional [int ]=None
    PRICE_6_MONTHS :Optional [int ]=None
    PRICE_12_MONTHS :Optional [int ]=None


    SUBSCRIPTION_EXPIRATION_NOTIFICATION_DAYS :int =Field (default =7 )
    SUBSCRIPTION_NOTIFICATION_HOUR_UTC :int =Field (default =9 )
    SUBSCRIPTION_NOTIFICATION_MINUTE_UTC :int =Field (default =0 )


    REFERRAL_BONUS_DAYS_1_MONTH :Optional [int ]=3
    REFERRAL_BONUS_DAYS_3_MONTHS :Optional [int ]=7
    REFERRAL_BONUS_DAYS_6_MONTHS :Optional [int ]=15
    REFERRAL_BONUS_DAYS_12_MONTHS :Optional [int ]=30
    REFEREE_BONUS_DAYS_1_MONTH :Optional [int ]=1
    REFEREE_BONUS_DAYS_3_MONTHS :Optional [int ]=3
    REFEREE_BONUS_DAYS_6_MONTHS :Optional [int ]=7
    REFEREE_BONUS_DAYS_12_MONTHS :Optional [int ]=15


    PANEL_API_URL :Optional [str ]=None
    PANEL_API_KEY :Optional [str ]=None
    PANEL_USER_DEFAULT_EXPIRE_DAYS :int =Field (default =1 )
    PANEL_USER_DEFAULT_TRAFFIC_BYTES :int =Field (default =0 )
    PANEL_USER_DEFAULT_TRAFFIC_STRATEGY :str =Field (default ="NO_RESET")
    PANEL_USER_DEFAULT_INBOUND_UUIDS :Optional [str ]=Field (default =None )


    TRIAL_ENABLED :bool =Field (default =True )
    TRIAL_DURATION_DAYS :int =Field (default =3 )
    TRIAL_TRAFFIC_LIMIT_GB :Optional [float ]=Field (default =5.0 )

    WEB_SERVER_HOST :str =Field (default ="0.0.0.0")
    WEB_SERVER_PORT :int =Field (default =8080 )
    LOGS_PAGE_SIZE :int =Field (default =10 )

    _admin_ids_list :Optional [List [int ]]=None

    @property
    def ADMIN_IDS (self )->List [int ]:
        if self ._admin_ids_list is None :
            if self .ADMIN_IDS_STR :
                try :
                    self ._admin_ids_list =[int (admin_id .strip ())for admin_id in self .ADMIN_IDS_STR .split (',')if admin_id .strip ().isdigit ()]
                    if not self ._admin_ids_list and self .ADMIN_IDS_STR :
                        logging .error (f"ADMIN_IDS_STR ('{self.ADMIN_IDS_STR}') contains non-integer values or is malformed. No admin IDs loaded from string.")
                        self ._admin_ids_list =[]
                except ValueError :
                    logging .error (f"Invalid ADMIN_IDS_STR format: '{self.ADMIN_IDS_STR}'. Expected comma-separated integers.")
                    self ._admin_ids_list =[]
            else :
                self ._admin_ids_list =[]
        return self ._admin_ids_list

    @property
    def PRIMARY_ADMIN_ID (self )->Optional [int ]:
        admin_ids_list =self .ADMIN_IDS
        if admin_ids_list :
            return admin_ids_list [0 ]
        return None

    @property
    def trial_traffic_limit_bytes (self )->int :
        if self .TRIAL_TRAFFIC_LIMIT_GB is None or self .TRIAL_TRAFFIC_LIMIT_GB <=0 :return 0
        return int (self .TRIAL_TRAFFIC_LIMIT_GB *(1024 **3 ))
    @property
    def parsed_default_panel_user_inbound_uuids (self )->Optional [List [str ]]:
        if self .PANEL_USER_DEFAULT_INBOUND_UUIDS :return [uuid .strip ()for uuid in self .PANEL_USER_DEFAULT_INBOUND_UUIDS .split (',')if uuid .strip ()]
        return None
    @property
    def yookassa_webhook_path (self )->str :return "/webhook/yookassa"
    @property
    def yookassa_full_webhook_url (self )->Optional [str ]:
        if self .YOOKASSA_WEBHOOK_BASE_URL :return f"{self.YOOKASSA_WEBHOOK_BASE_URL.rstrip('/')}{self.yookassa_webhook_path}"
        return None
    @property
    def subscription_options (self )->Dict [int ,int ]:
        options :Dict [int ,int ]={};
        if self .PRICE_1_MONTH is not None :options [1 ]=self .PRICE_1_MONTH
        if self .PRICE_3_MONTHS is not None :options [3 ]=self .PRICE_3_MONTHS
        if self .PRICE_6_MONTHS is not None :options [6 ]=self .PRICE_6_MONTHS
        if self .PRICE_12_MONTHS is not None :options [12 ]=self .PRICE_12_MONTHS
        return options
    @property
    def referral_bonus_inviter (self )->Dict [int ,int ]:
        bonuses :Dict [int ,int ]={};
        if self .REFERRAL_BONUS_DAYS_1_MONTH is not None :bonuses [1 ]=self .REFERRAL_BONUS_DAYS_1_MONTH
        if self .REFERRAL_BONUS_DAYS_3_MONTHS is not None :bonuses [3 ]=self .REFERRAL_BONUS_DAYS_3_MONTHS
        if self .REFERRAL_BONUS_DAYS_6_MONTHS is not None :bonuses [6 ]=self .REFERRAL_BONUS_DAYS_6_MONTHS
        if self .REFERRAL_BONUS_DAYS_12_MONTHS is not None :bonuses [12 ]=self .REFERRAL_BONUS_DAYS_12_MONTHS
        return bonuses
    @property
    def referral_bonus_referee (self )->Dict [int ,int ]:
        bonuses :Dict [int ,int ]={};
        if self .REFEREE_BONUS_DAYS_1_MONTH is not None :bonuses [1 ]=self .REFEREE_BONUS_DAYS_1_MONTH
        if self .REFEREE_BONUS_DAYS_3_MONTHS is not None :bonuses [3 ]=self .REFEREE_BONUS_DAYS_3_MONTHS
        if self .REFEREE_BONUS_DAYS_6_MONTHS is not None :bonuses [6 ]=self .REFEREE_BONUS_DAYS_6_MONTHS
        if self .REFEREE_BONUS_DAYS_12_MONTHS is not None :bonuses [12 ]=self .REFEREE_BONUS_DAYS_12_MONTHS
        return bonuses

    model_config =SettingsConfigDict (env_file ='.env',env_file_encoding ='utf-8',extra ='ignore',populate_by_name =True )

_settings_instance :Optional [Settings ]=None
def get_settings ()->Settings :
    global _settings_instance
    if _settings_instance is None :
        try :
            _settings_instance =Settings ()
            if not _settings_instance .ADMIN_IDS :
                 logging .warning ("CRITICAL: ADMIN_IDS not set or contains no valid integer IDs in .env. Admin functionality will be restricted.")
        except ValidationError as e :
            logging .critical (f"Pydantic validation error while loading settings: {e}")
            raise SystemExit (f"CRITICAL SETTINGS ERROR: {e}")
    return _settings_instance