'use client';

import { useState, useEffect } from 'react';
import { Note } from '@/lib/types';
import { useToast } from '@/components/ui/toast';

export function useReminderCheck(notes: Note[]) {
  const [notifiedReminders, setNotifiedReminders] = useState<Set<string>>(new Set());
  const { addToast } = useToast();

  useEffect(() => {
    const checkReminders = () => {
      const now = new Date();
      
      notes.forEach(note => {
        if (!note.reminder) return;
        
        const reminderDate = new Date(note.reminder);
        
        // Check if reminder is due (within last minute or future)
        // We only notify if it's due now or just passed, not old overdue ones (unless we want to catch up)
        // Let's say: notify if reminder time is passed AND we haven't notified yet.
        
        if (reminderDate <= now && !notifiedReminders.has(note.id)) {
          // Play sound (optional)
          // const audio = new Audio('/notification.mp3');
          // audio.play().catch(e => console.log('Audio play failed', e));

          addToast("🔔 Reminder: " + (note.title || "Untitled Note"), "info");

          // Mark as notified in local state
          setNotifiedReminders(prev => new Set(prev).add(note.id));
        }
      });
    };

    // Check immediately
    checkReminders();

    // Then check every 30 seconds
    const interval = setInterval(checkReminders, 30000);

    return () => clearInterval(interval);
  }, [notes, notifiedReminders, addToast]);
}