"""FluentGerman.ai — Application configuration."""

from functools import lru_cache
from typing import Literal

from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    """App settings loaded from environment / .env file."""

    # App
    app_name: str = "FluentGerman.ai"
    app_port: int = 8999
    app_domain: str = ""
    debug: bool = False

    # Security
    secret_key: str = "CHANGE-ME-in-production"
    access_token_expire_minutes: int = 60 * 24  # 24h
    algorithm: str = "HS256"

    # Database
    database_url: str = "mysql+aiomysql://fluentgerman:fluentgerman@localhost:3306/fluentgerman"

    # LLM
    llm_provider: str = "openai"  # used by litellm routing
    llm_api_key: str = ""
    llm_model: str = "gpt-4o-mini"

    # Voice feature flag: "api" = LLM provider Whisper/TTS, "browser" = Web Speech API
    voice_mode: Literal["api", "browser"] = "api"
    tts_model: str = "tts-1"
    tts_voice: str = "alloy"
    stt_model: str = "whisper-1"

    # Admin bootstrap
    admin_email: str = "admin@fluentgerman.ai"
    admin_username: str = "admin"
    admin_password: str = "CHANGE-ME"

    model_config = {"env_file": ".env", "env_file_encoding": "utf-8"}


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