import type { WalletSummary } from './shared';
import { useSearchParams } from 'react-router';
import { WALLET_PARAM } from './shared';
import { useWallets } from './useWalletData';

// Which wallet is open lives in `?wallet=<id>`, read independently by every panel — never passed between
// them over a channel. See docs/navigation-audit.md.
//
// With no param, the sidecar's own `isActive` wallet wins, then the first in the list. That fallback is a
// display default, not a selection: the URL stays bare so a shared /wallet link means "whatever is active
// right now" rather than pinning whichever wallet the sender happened to have open.

export type SelectedWallet = {
  walletId: number | null;
  wallet: WalletSummary | null;
  wallets: WalletSummary[];
  /** True when the id came from the URL rather than the active-wallet fallback. */
  isPinned: boolean;
  isLoading: boolean;
};

export function useSelectedWallet(): SelectedWallet {
  const [params] = useSearchParams();
  const { wallets, isLoading } = useWallets();

  const raw = params.get(WALLET_PARAM);
  const pinnedId = raw && /^\d+$/.test(raw) ? Number(raw) : null;
  const pinned = pinnedId == null ? null : (wallets.find((w) => w.id === pinnedId) ?? null);
  const fallback = wallets.find((w) => w.isActive) ?? wallets[0] ?? null;
  const wallet = pinned ?? fallback;

  return {
    walletId: wallet?.id ?? null,
    wallet,
    wallets,
    isPinned: pinned != null,
    isLoading,
  };
}