// Per-user customization of the filter sidebar: order of the widget cards, which are
// collapsed, and which are hidden. Persisted to localStorage and the server-side
// `preferences` blob so it follows the account.

// `show`, `sort` and `content` moved to the feed toolbar (above the cards); they are no
// longer sidebar widgets. normalizeLayout drops them from any persisted layout automatically.
export type WidgetId = "date" | "language" | "topic" | "tags";

export const ALL_WIDGETS: WidgetId[] = ["date", "language", "topic", "tags"];

export const WIDGET_TITLES: Record<WidgetId, string> = {
  date: "Upload date",
  language: "Language",
  topic: "Topic",
  tags: "Tags",
};

export interface SidebarLayout {
  order: WidgetId[];
  collapsed: Partial<Record<WidgetId, boolean>>;
  hidden: Partial<Record<WidgetId, boolean>>;
}

export const DEFAULT_LAYOUT: SidebarLayout = {
  order: [...ALL_WIDGETS],
  collapsed: {},
  hidden: {},
};

const KEY = "subfeed.sidebarLayout";

// Tolerate stale/partial data: keep only known widgets and append any that are missing
// (e.g. a widget added in a later version) so nothing silently disappears.
export function normalizeLayout(raw: unknown): SidebarLayout {
  const r = (raw ?? {}) as Partial<SidebarLayout>;
  const order: WidgetId[] = Array.isArray(r.order)
    ? (r.order.filter((x) => ALL_WIDGETS.includes(x as WidgetId)) as WidgetId[])
    : [];
  for (const w of ALL_WIDGETS) if (!order.includes(w)) order.push(w);
  return {
    order,
    collapsed: { ...(r.collapsed ?? {}) },
    hidden: { ...(r.hidden ?? {}) },
  };
}

export function loadLayout(): SidebarLayout {
  try {
    return normalizeLayout(JSON.parse(localStorage.getItem(KEY) || "{}"));
  } catch {
    return DEFAULT_LAYOUT;
  }
}

export function saveLayoutLocal(l: SidebarLayout): void {
  localStorage.setItem(KEY, JSON.stringify(l));
}