from typing import Any

import pydantic


class Settings(pydantic.BaseSettings):
    redis_host: str = "localhost"
    redis_port: int = 6379
    redis_db: int = 0

    allowed_worker_compat_hashes: list[str] = ["distilgpt2"]

    sse_retry_timeout: int = 15000
    update_alembic: bool = True
    alembic_retries: int = 5
    alembic_retry_timeout: int = 1

    postgres_host: str = "localhost"
    postgres_port: str = "5432"
    postgres_user: str = "postgres"
    postgres_password: str = "postgres"
    postgres_db: str = "postgres"

    database_uri: str | None = None

    @pydantic.validator("database_uri", pre=True)
    def assemble_db_connection(cls, v: str | None, values: dict[str, Any]) -> Any:
        if isinstance(v, str):
            return v
        return pydantic.PostgresDsn.build(
            scheme="postgresql",
            user=values.get("postgres_user"),
            password=values.get("postgres_password"),
            host=values.get("postgres_host"),
            port=values.get("postgres_port"),
            path=f"/{values.get('postgres_db') or ''}",
        )


settings = Settings()