from functools import lru_cache
from typing import Optional

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    db_url: str = Field(
        "mysql+asyncmy://root:password@localhost:3306/aws_ec2_panel?charset=utf8mb4", description="SQLAlchemy DB URL"
    )
    jwt_secret: str = Field("change-me", description="JWT secret key")
    jwt_algorithm: str = Field("HS256", description="JWT algorithm")
    jwt_expire_minutes: int = Field(60, description="JWT expiry in minutes")
    aws_proxy_url: Optional[str] = Field(default=None, description="Optional proxy for AWS SDK")
    aws_timeout: int = Field(30, description="AWS SDK timeout seconds")
    auto_open_sg_enabled: bool = Field(True, description="Auto-create/use open-all security group when none provided")
    scope_sync_min_interval_seconds: int = Field(15, description="Min interval between scope sync enqueue")
    global_sync_interval_minutes: int = Field(5, description="Interval minutes for background global sync")
    global_sync_max_concurrency: int = Field(3, description="Max concurrent scope sync tasks")

    model_config = SettingsConfigDict(env_file=("backend/.env", ".env"), env_prefix="", extra="ignore")


@lru_cache(maxsize=1)
def get_settings() -> Settings:
    return Settings()


settings = get_settings()