// NOTE: This file is stable and usually should not be modified.
// It is important that all functionality in this file is preserved, and should only be modified if explicitly requested.

import { ChevronDown, LogOut, UserIcon, UserPlus, Wallet } from 'lucide-react';
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu.tsx';
import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar.tsx';
import { WalletModal } from '@/components/WalletModal';
import { clearDmDecryptCache } from '@/lib/dmDecryptCache';
import { clearTranslationMemory } from '@/lib/translation';
import { useLoggedInAccounts, type Account } from '@/hooks/useLoggedInAccounts';
import { genUserName } from '@/lib/genUserName';
import { useTranslation } from '@/contexts/language';

interface AccountSwitcherProps {
  onAddAccountClick: () => void;
}

export function AccountSwitcher({ onAddAccountClick }: AccountSwitcherProps) {
  const { currentUser, otherUsers, setLogin, removeLogin } = useLoggedInAccounts();
  const { t } = useTranslation();

  if (!currentUser) return null;

  const getDisplayName = (account: Account): string => {
    return account.metadata?.name ?? genUserName(account.pubkey);
  }

  const getNip05 = (account: Account): string | undefined => {
    return account.metadata?.nip05;
  }

  return (
    <DropdownMenu modal={false}>
      <DropdownMenuTrigger asChild>
        <button className='flex items-center gap-3 p-3 rounded-full hover:bg-accent transition-all w-full text-foreground'>
          <div className="relative">
            <Avatar className='w-10 h-10'>
              <AvatarImage src={currentUser.metadata?.picture} alt={getDisplayName(currentUser)} />
              <AvatarFallback>{getDisplayName(currentUser).charAt(0)}</AvatarFallback>
            </Avatar>
            {/* Green online indicator dot */}
            <span className="absolute -bottom-0.5 -right-0.5 w-3.5 h-3.5 bg-green-500 border-2 border-background rounded-full" />
          </div>
          <div className='flex-1 text-left hidden md:block truncate'>
            <p className='font-medium text-sm truncate'>{getDisplayName(currentUser)}</p>
            {getNip05(currentUser) && (
              <p className='text-xs text-muted-foreground truncate'>
                {getNip05(currentUser)}
              </p>
            )}
          </div>
          <ChevronDown className='w-4 h-4 text-muted-foreground' />
        </button>
      </DropdownMenuTrigger>
      <DropdownMenuContent className='w-56 p-2 animate-scale-in'>
        <div className='font-medium text-sm px-2 py-1.5'>{t('settingsUi.accountSwitcher.switchAccount')}</div>
        {otherUsers.map((user) => (
          <DropdownMenuItem
            key={user.id}
            onClick={() => setLogin(user.id)}
            className='flex items-center gap-2 cursor-pointer p-2 rounded-md'
          >
            <Avatar className='w-8 h-8'>
              <AvatarImage src={user.metadata?.picture} alt={getDisplayName(user)} />
              <AvatarFallback>{getDisplayName(user)?.charAt(0) || <UserIcon />}</AvatarFallback>
            </Avatar>
            <div className='flex-1 truncate'>
              <p className='text-sm font-medium'>{getDisplayName(user)}</p>
              {getNip05(user) && (
                <p className='text-xs text-muted-foreground truncate'>
                  {getNip05(user)}
                </p>
              )}
            </div>
            {user.id === currentUser.id && <div className='w-2 h-2 rounded-full bg-primary'></div>}
          </DropdownMenuItem>
        ))}
        <DropdownMenuSeparator />
        <WalletModal>
          <DropdownMenuItem
            className='flex items-center gap-2 cursor-pointer p-2 rounded-md'
            onSelect={(e) => e.preventDefault()}
          >
            <Wallet className='w-4 h-4' />
            <span>{t('settingsUi.accountSwitcher.walletSettings')}</span>
          </DropdownMenuItem>
        </WalletModal>
        <DropdownMenuItem
          onClick={onAddAccountClick}
          className='flex items-center gap-2 cursor-pointer p-2 rounded-md'
        >
          <UserPlus className='w-4 h-4' />
          <span>{t('settingsUi.accountSwitcher.addAccount')}</span>
        </DropdownMenuItem>
        <DropdownMenuItem
          onClick={() => {
            // Drop this account's plaintext DM cache (device-local) on logout so
            // another account on the same device can't read it from IndexedDB.
            void clearDmDecryptCache(currentUser.id).catch(() => {});
            clearTranslationMemory();
            removeLogin(currentUser.id);
          }}
          className='flex items-center gap-2 cursor-pointer p-2 rounded-md text-red-500'
        >
          <LogOut className='w-4 h-4' />
          <span>{t('settingsUi.accountSwitcher.logout')}</span>
        </DropdownMenuItem>
      </DropdownMenuContent>
    </DropdownMenu>
  );
}