from typing import Any, Dict, List, Optional, Union

from pydantic import AnyHttpUrl, BaseSettings, PostgresDsn, validator


class Settings(BaseSettings):
    PROJECT_NAME: str = "open-assistant backend"
    API_V1_STR: str = "/api/v1"

    POSTGRES_HOST: str = "localhost"
    POSTGRES_PORT: str = "5432"
    POSTGRES_USER: str = "postgres"
    POSTGRES_PASSWORD: str = "postgres"
    POSTGRES_DB: str = "postgres"
    DATABASE_URI: Optional[PostgresDsn] = None

    RATE_LIMIT: bool = True
    REDIS_HOST: str = "localhost"
    REDIS_PORT: str = "6379"

    DEBUG_ALLOW_ANY_API_KEY: bool = False
    DEBUG_SKIP_API_KEY_CHECK: bool = False
    DEBUG_USE_SEED_DATA: bool = False

    @validator("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_HOST"),
            port=values.get("POSTGRES_PORT"),
            path=f"/{values.get('POSTGRES_DB') or ''}",
        )

    BACKEND_CORS_ORIGINS: List[AnyHttpUrl] = []
    UPDATE_ALEMBIC: bool = True

    @validator("BACKEND_CORS_ORIGINS", pre=True)
    def assemble_cors_origins(cls, v: Union[str, List[str]]) -> Union[List[str], str]:
        if isinstance(v, str) and not v.startswith("["):
            return [i.strip() for i in v.split(",")]
        elif isinstance(v, (list, str)):
            return v
        raise ValueError(v)


settings = Settings(_env_file=".env")