"""
应用配置：从 backend/.env 读取,含数据库、JWT、Neo4j、大模型与语音相关项。
"""
from pathlib import Path
from pydantic_settings import BaseSettings, SettingsConfigDict

_BACKEND_DIR = Path(__file__).resolve().parents[2]  
_ENV_FILE = _BACKEND_DIR / ".env"

class Settings(BaseSettings):
    model_config = SettingsConfigDict(env_file=str(_ENV_FILE), env_file_encoding="utf-8")
    app_name: str = "KnowMathBot API" #项目名
    api_v1_prefix: str = "/api/v1" #接口前缀
    #JWT登录认证
    jwt_secret_key: str = "CHANGE_ME_IN_ENV"
    jwt_algorithm: str = "HS256"
    access_token_exp_minutes: int = 60 * 24 #令牌有效期 1 天
    #数据库配置
    database_url: str = "sqlite:///./knowmathbot.db"
    #Neo4j知识图谱配置
    neo4j_uri: str = "neo4j://127.0.0.1:7687"
    neo4j_user: str = "neo4j"
    neo4j_password: str = "please_change_me"
    neo4j_database: str = "neo4j"
    #TTS语音合成配置
    local_tts_enabled: bool = False
    local_tts_model_dir: str = str(_BACKEND_DIR / "storage" / "tts")
    local_tts_ckpt_path: str = ""
    local_tts_pth_path: str = ""
    local_tts_provider: str = "pyttsx3"
    local_tts_api_url: str = ""
    local_tts_api_timeout_seconds: int = 60
    local_tts_ref_wav_path: str = ""
    local_tts_prompt_text: str = ""
    local_tts_prompt_lang: str = "zh"
    local_tts_text_lang: str = "zh"
    #外部大模型 API
    deepseek_api_key: str = ""
    deepseek_base_url: str = "https://api.deepseek.com"
    deepseek_model: str = "deepseek-chat"
    llm_request_timeout_seconds: int = 30
    voice_assets_dir: str = str(_BACKEND_DIR / "storage" / "voice_assets")

settings = Settings()