import { useState, useEffect } from 'react';
import { AlertTriangle, X, Download, CheckCircle } from 'lucide-react';
import { Button } from '@/components/ui/button';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { useLocalStorage } from '@/hooks/useLocalStorage';
import { useTranslation } from '@/contexts/LanguageContext';
import {
  Sheet,
  SheetContent,
  SheetDescription,
  SheetHeader,
  SheetTitle,
} from '@/components/ui/sheet';

const BACKUP_REMINDER_KEY = 'backup-reminder-dismissed';
const BACKUP_CONFIRMED_KEY = 'backup-confirmed';

/**
 * Persistent backup reminder that shows after signup
 * Encourages users to backup their recovery phrase or nsec
 * Uses a bottom sheet for better mobile experience
 */
export function BackupReminder() {
  const { user } = useCurrentUser();
  const [dismissed, setDismissed] = useLocalStorage(BACKUP_REMINDER_KEY, false);
  const [confirmed, setConfirmed] = useLocalStorage(BACKUP_CONFIRMED_KEY, false);
  const [showReminder, setShowReminder] = useState(false);
  const { t } = useTranslation();

  useEffect(() => {
    if (!user) {
      setShowReminder(false);
      return;
    }

    // Show reminder if:
    // 1. User is logged in
    // 2. Not dismissed
    // 3. Not confirmed they backed up
    // Add a small delay so it doesn't immediately pop up on login
    const timer = setTimeout(() => {
      const shouldShow = !dismissed && !confirmed;
      setShowReminder(shouldShow);
    }, 2000);

    return () => clearTimeout(timer);
  }, [user, dismissed, confirmed]);

  const handleDismiss = () => {
    setDismissed(true);
    setShowReminder(false);
  };

  const handleConfirmBackup = () => {
    setConfirmed(true);
    setShowReminder(false);
  };

  const handleBackupNow = () => {
    window.location.href = '/settings?tab=security';
  };

  if (!showReminder) return null;

  return (
    <Sheet open={showReminder} onOpenChange={setShowReminder}>
      <SheetContent 
        side="bottom" 
        className="rounded-t-2xl border-t-4 border-amber-500 bg-gradient-to-b from-amber-950/90 to-black/95 backdrop-blur-lg"
        onInteractOutside={(e) => e.preventDefault()}
      >
        <SheetHeader className="text-left">
          <div className="flex items-start justify-between">
            <div className="flex items-center gap-3">
              <div className="flex-shrink-0 w-10 h-10 sm:w-12 sm:h-12 rounded-full bg-amber-500/20 flex items-center justify-center">
                <AlertTriangle className="h-5 w-5 sm:h-6 sm:w-6 text-amber-500" />
              </div>
              <div className="flex-1">
                <SheetTitle className="text-lg sm:text-xl font-bold text-amber-400">
                  {t('backup.title')}
                </SheetTitle>
                <SheetDescription className="text-xs sm:text-sm text-gray-400">
                  {t('backup.subtitle')}
                </SheetDescription>
              </div>
            </div>
            <Button
              variant="ghost"
              size="icon"
              onClick={handleDismiss}
              className="ml-2 -mt-1 text-gray-500 hover:text-gray-300"
            >
              <X className="h-5 w-5" />
            </Button>
          </div>
        </SheetHeader>

        <div className="mt-4 sm:mt-6 space-y-4">
          {/* Warning message */}
          <div className="p-3 sm:p-4 rounded-xl bg-amber-500/10 border border-amber-500/30">
            <p className="text-sm sm:text-base text-gray-200 leading-relaxed">
              {t('backup.message')}
            </p>
            <p className="text-sm sm:text-base text-gray-300 mt-2">
              ⚠️ {t('backup.warning')}
            </p>
          </div>

          {/* Action buttons - stacked on mobile */}
          <div className="flex flex-col sm:flex-row gap-3">
            <Button
              onClick={handleBackupNow}
              className="flex-1 h-12 sm:h-11 text-sm sm:text-base font-semibold bg-amber-500 hover:bg-amber-600 text-black"
              size="lg"
            >
              <Download className="mr-2 h-5 w-5" />
              {t('backup.backupNow')}
            </Button>
            
            <Button
              onClick={handleConfirmBackup}
              variant="outline"
              className="flex-1 h-12 sm:h-11 text-sm sm:text-base border-amber-500/50 text-amber-400 hover:bg-amber-500/20"
              size="lg"
            >
              <CheckCircle className="mr-2 h-5 w-5" />
              {t('backup.confirmed')}
            </Button>
          </div>

          {/* Dismiss link */}
          <div className="text-center pt-1">
            <button 
              onClick={handleDismiss}
              className="text-xs text-gray-500 hover:text-gray-400 underline"
            >
              {t('backup.remindLater')}
            </button>
          </div>
        </div>
      </SheetContent>
    </Sheet>
  );
}