"""应用配置（env 解析）。提供商注册/档位默认见后续阶段。"""

from __future__ import annotations

from functools import lru_cache

from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    model_config = SettingsConfigDict(env_file=".env", extra="ignore")

    app_env: str = "dev"
    log_json: bool = False
    database_url: str = "postgresql+asyncpg://writer:writer@localhost:5432/writer"
    database_url_sync: str = "postgresql+psycopg://writer:writer@localhost:5432/writer"
    credential_enc_key: str = ""

    # 档位默认（writer/analyst/light）——具体 provider:model 经 tier_routing 覆盖
    tier_defaults: dict[str, str] = {
        "writer": "deepseek:deepseek-chat",
        "analyst": "deepseek:deepseek-chat",
        "light": "deepseek:deepseek-chat",
    }


@lru_cache
def get_settings() -> Settings:
    return Settings()