from dotenv import load_dotenv
import secrets
from typing import Any, Dict, Optional

from pydantic import BaseSettings, PostgresDsn, validator


class Settings(BaseSettings):
    # openssl rand -hex 32
    SECRET_KEY: str = secrets.token_urlsafe(32)
    MIDDLEWARE_SECRET_KEY: str = secrets.token_urlsafe(5)
    ALGORITHM: str = "HS256"
    JWT_TOKEN_EXPIRE_MINUTES: int = 30
    HOST: str = "0.0.0.0"
    PORT: int = 80
    DEBUG: bool = False
    LOG_LEVEL: str = "NOTSET"
    POSTGRES_SERVER: str = ""
    POSTGRES_USER: str = "postgres"
    POSTGRES_PASSWORD: str = ""
    POSTGRES_DB: str = ""
    SQLALCHEMY_DATABASE_URI: Optional[str] = None

    @validator("SQLALCHEMY_DATABASE_URI", pre=True)
    def assemble_db_connection(cls, v: Optional[str], values: Dict[str, Any]) -> Any:
        if isinstance(v, str):
            return v
        return PostgresDsn.build(
            scheme="postgresql",
            user=values.get("POSTGRES_USER"),
            password=values.get("POSTGRES_PASSWORD"),
            host=values.get("POSTGRES_SERVER"),
            path=f"/{values.get('POSTGRES_DB') or ''}",
        )

    ALEMBIC_LOG_LEVEL: str = "INFO"
    ALEMBIC_SQLALCHEMY_LOG_LEVEL: str = "WARN"

    class Config:
        case_sensitive = True
        env_file = ".env"


load_dotenv()
settings = Settings()