"""settings.json — user preferences."""
from __future__ import annotations

from dataclasses import asdict, dataclass, fields
from pathlib import Path

from .util import atomic_write_json, read_json

LINK_MODES = ("symlink", "hardlink", "copy")


@dataclass
class Settings:
    game_dir: str = ""            # manual override; empty = auto-discover
    link_mode: str = "symlink"
    auto_deploy: bool = True      # deploy on every checkbox toggle (Fluffy behaviour)
    steam_user_id: str = ""       # empty = first userdata dir
    reframework_version: str = ""

    @classmethod
    def load(cls, path: Path) -> "Settings":
        raw = read_json(path, {})
        known = {f.name for f in fields(cls)}
        s = cls(**{k: v for k, v in raw.items() if k in known}) if isinstance(raw, dict) else cls()
        if s.link_mode not in LINK_MODES:
            s.link_mode = "symlink"
        return s

    def save(self, path: Path) -> None:
        atomic_write_json(path, asdict(self))