import type { SetId } from "../board/pieces";

export interface Prefs {
  pieceSet: SetId;
  theme: "paper" | "crt";
  sound: boolean;
  reactions: boolean;
  coords: boolean;
  personality: string;
  side: "w" | "b" | "random";
  clock: string;
  clockBase: number; // custom base, seconds
  clockInc: number; // custom increment, seconds
  threats: boolean;
  blunder: boolean;
}

const DEFAULTS: Prefs = {
  pieceSet: "kingdom",
  theme: "paper",
  sound: true,
  reactions: false,
  coords: true,
  personality: "beginner",
  side: "w",
  clock: "none",
  clockBase: 300,
  clockInc: 0,
  threats: false,
  blunder: false,
};

const PREFS_KEY = "emchess.prefs";
const SAVE_KEY = "emchess.save";

export function loadPrefs(): Prefs {
  try {
    const raw = localStorage.getItem(PREFS_KEY);
    if (!raw) return { ...DEFAULTS };
    return { ...DEFAULTS, ...JSON.parse(raw) };
  } catch {
    return { ...DEFAULTS };
  }
}

export function savePrefs(prefs: Prefs) {
  try {
    localStorage.setItem(PREFS_KEY, JSON.stringify(prefs));
  } catch {
    /* private mode, no storage — the game still works, it just won't remember. */
  }
}

export interface SavedGame {
  pgn: string;
  side: "w" | "b";
  personality: string;
  savedAt: number;
}

export function saveGame(game: SavedGame) {
  try {
    localStorage.setItem(SAVE_KEY, JSON.stringify(game));
  } catch {
    /* ignore */
  }
}

export function loadGame(): SavedGame | null {
  try {
    const raw = localStorage.getItem(SAVE_KEY);
    return raw ? (JSON.parse(raw) as SavedGame) : null;
  } catch {
    return null;
  }
}

export function clearGame() {
  try {
    localStorage.removeItem(SAVE_KEY);
  } catch {
    /* ignore */
  }
}