backend/config.py

from __future__ import annotations
from pydantic import BaseModel
from typing import Optional
from pathlib import Path
import json

CONFIG_FILE = Path(__file__).parent / "config.json"


class AppConfig(BaseModel):
    # 将 token 重命名为 key
    key: Optional[str] = None

    # 图片生成默认参数（与原项目保持一致的关键项）
    model: str = "nai-diffusion-3"
    sampler: str = "k_euler"
    steps: int = 28
    scale: float = 5.0
    cfg_rescale: float = 0.0
    noise_schedule: Optional[str] = "karras"
    uc_preset: int = 4
    quality_toggle: bool = True
    legacy_uc: bool = False

    # 通用配置
    port: int = 7860
    save_output: bool = True
    # 输出根目录（默认：项目根/output）
    output_dir: str = str(Path(__file__).resolve().parent.parent / "output")
    # 提示音配置
    sound_enabled: bool = False
    sound_url: Optional[str] = "/ring/ring.mp3"


def load_config() -> AppConfig:
    if CONFIG_FILE.exists():
        with open(CONFIG_FILE, "r", encoding="utf-8") as f:
            data = json.load(f)
        return AppConfig(**data)
    cfg = AppConfig()
    save_config(cfg)
    return cfg


def save_config(cfg: AppConfig) -> None:
    CONFIG_FILE.parent.mkdir(parents=True, exist_ok=True)
    with open(CONFIG_FILE, "w", encoding="utf-8") as f:
        json.dump(cfg.model_dump(), f, ensure_ascii=False, indent=2)