'use client';

import { useEffect, useState } from 'react';
import { Alert, LinearProgress, Box, Typography } from '@mui/material';
import { motion, AnimatePresence } from 'framer-motion';
import { CloudOff, CloudQueue, CloudDone } from '@mui/icons-material';

interface OfflineIndicatorProps {
  isOnline?: boolean;
  pendingActionsCount?: number;
  syncInProgress?: boolean;
}

export const OfflineIndicator = ({
  isOnline: propIsOnline,
  pendingActionsCount = 0,
  syncInProgress = false,
}: OfflineIndicatorProps) => {
  const [isOnline, setIsOnline] = useState(true);

  useEffect(() => {
    // Set initial online status
    setIsOnline(navigator.onLine);

    // Listen for online/offline events
    const handleOnline = () => setIsOnline(true);
    const handleOffline = () => setIsOnline(false);

    window.addEventListener('online', handleOnline);
    window.addEventListener('offline', handleOffline);

    return () => {
      window.removeEventListener('online', handleOnline);
      window.removeEventListener('offline', handleOffline);
    };
  }, []);

  const effectiveIsOnline = propIsOnline !== undefined ? propIsOnline : isOnline;

  return (
    <>
      <AnimatePresence>
        {!effectiveIsOnline && (
          <motion.div
            initial={{ y: -100, opacity: 0 }}
            animate={{ y: 0, opacity: 1 }}
            exit={{ y: -100, opacity: 0 }}
            transition={{ type: 'spring', stiffness: 300, damping: 30 }}
            style={{
              position: 'fixed',
              top: 0,
              left: 0,
              right: 0,
              zIndex: 9999,
            }}
          >
            <Alert
              severity="warning"
              icon={<CloudOff />}
              sx={{
                borderRadius: 0,
                boxShadow: 2,
              }}
            >
              <Box>
                <Typography variant="body2" fontWeight="600">
                  You're offline
                </Typography>
                {pendingActionsCount > 0 && (
                  <Typography variant="caption">
                    {pendingActionsCount} action{pendingActionsCount !== 1 ? 's' : ''} will sync when you're back online
                  </Typography>
                )}
              </Box>
            </Alert>
          </motion.div>
        )}

        {effectiveIsOnline && syncInProgress && (
          <motion.div
            initial={{ y: -100, opacity: 0 }}
            animate={{ y: 0, opacity: 1 }}
            exit={{ y: -100, opacity: 0 }}
            transition={{ type: 'spring', stiffness: 300, damping: 30 }}
            style={{
              position: 'fixed',
              top: 0,
              left: 0,
              right: 0,
              zIndex: 9999,
            }}
          >
            <Alert
              severity="info"
              icon={<CloudQueue />}
              sx={{
                borderRadius: 0,
                boxShadow: 2,
              }}
            >
              <Box>
                <Typography variant="body2" fontWeight="600">
                  Syncing data...
                </Typography>
                {pendingActionsCount > 0 && (
                  <Typography variant="caption">
                    {pendingActionsCount} action{pendingActionsCount !== 1 ? 's' : ''} remaining
                  </Typography>
                )}
              </Box>
            </Alert>
            <LinearProgress />
          </motion.div>
        )}

        {effectiveIsOnline && !syncInProgress && pendingActionsCount === 0 &&
         typeof propIsOnline !== 'undefined' && propIsOnline && (
          <motion.div
            initial={{ y: -100, opacity: 0 }}
            animate={{ y: 0, opacity: 1 }}
            exit={{ y: -100, opacity: 0 }}
            transition={{ type: 'spring', stiffness: 300, damping: 30 }}
            onAnimationComplete={() => {
              // Auto-hide after 3 seconds
              setTimeout(() => {
                const element = document.getElementById('sync-complete-alert');
                if (element) {
                  element.style.display = 'none';
                }
              }, 3000);
            }}
            style={{
              position: 'fixed',
              top: 0,
              left: 0,
              right: 0,
              zIndex: 9999,
            }}
            id="sync-complete-alert"
          >
            <Alert
              severity="success"
              icon={<CloudDone />}
              sx={{
                borderRadius: 0,
                boxShadow: 2,
              }}
            >
              <Typography variant="body2" fontWeight="600">
                All data synced successfully!
              </Typography>
            </Alert>
          </motion.div>
        )}
      </AnimatePresence>
    </>
  );
};