from pydantic_settings import BaseSettings, SettingsConfigDict
from pydantic import field_validator
from typing import Optional

class Settings(BaseSettings):
    bot_token: str = ""
    webhook_url: Optional[str] = None
    telegram_api_server: Optional[str] = None
    fx_api_key: str = ""
    database_url: str = "sqlite+aiosqlite:///./flyrates.db"
    log_level: str = "INFO"
    delete_webhook_on_local: bool = False

    @field_validator("database_url", mode="before")
    @classmethod
    def assemble_db_connection(cls, v: str) -> str:
        if isinstance(v, str):
            if v.startswith("postgres://"):
                return v.replace("postgres://", "postgresql+asyncpg://", 1)
            if v.startswith("postgresql://") and not v.startswith("postgresql+asyncpg://"):
                return v.replace("postgresql://", "postgresql+asyncpg://", 1)
        return v

    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8", extra="ignore")

settings = Settings()