'use client';

import { useState, useEffect } from 'react';
import {
  Card,
  CardContent,
  Typography,
  Button,
  Box,
  Dialog,
  DialogTitle,
  DialogContent,
  DialogContentText,
  DialogActions,
  TextField,
  Alert,
  CircularProgress,
  Chip,
} from '@mui/material';
import { DeleteForever, Cancel, Warning } from '@mui/icons-material';
import { complianceApi, DeletionRequest } from '@/lib/api/compliance';
import { useAuth } from '@/lib/auth/AuthContext';

export function AccountDeletion() {
  const { logout } = useAuth();
  const [deletionRequest, setDeletionRequest] = useState<DeletionRequest | null>(null);
  const [isDialogOpen, setIsDialogOpen] = useState(false);
  const [isCancelDialogOpen, setIsCancelDialogOpen] = useState(false);
  const [reason, setReason] = useState('');
  const [cancellationReason, setCancellationReason] = useState('');
  const [isLoading, setIsLoading] = useState(false);
  const [isCheckingStatus, setIsCheckingStatus] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [success, setSuccess] = useState<string | null>(null);

  useEffect(() => {
    checkDeletionStatus();
  }, []);

  const checkDeletionStatus = async () => {
    setIsCheckingStatus(true);
    try {
      const status = await complianceApi.getDeletionStatus();
      setDeletionRequest(status);
    } catch (err) {
      console.error('Failed to check deletion status:', err);
    } finally {
      setIsCheckingStatus(false);
    }
  };

  const handleRequestDeletion = async () => {
    setIsLoading(true);
    setError(null);
    setSuccess(null);

    try {
      const request = await complianceApi.requestAccountDeletion(reason);
      setDeletionRequest(request);
      setSuccess(
        `Account deletion scheduled for ${new Date(request.scheduledDeletionAt).toLocaleDateString()}. You can cancel this request within 30 days.`
      );
      setIsDialogOpen(false);
      setReason('');
    } catch (err: any) {
      console.error('Failed to request deletion:', err);
      setError(err.response?.data?.message || 'Failed to request account deletion. Please try again.');
    } finally {
      setIsLoading(false);
    }
  };

  const handleCancelDeletion = async () => {
    setIsLoading(true);
    setError(null);
    setSuccess(null);

    try {
      await complianceApi.cancelAccountDeletion(cancellationReason);
      setDeletionRequest(null);
      setSuccess('Account deletion request has been cancelled successfully.');
      setIsCancelDialogOpen(false);
      setCancellationReason('');
    } catch (err: any) {
      console.error('Failed to cancel deletion:', err);
      setError(err.response?.data?.message || 'Failed to cancel account deletion. Please try again.');
    } finally {
      setIsLoading(false);
    }
  };

  if (isCheckingStatus) {
    return (
      <Card>
        <CardContent>
          <Box display="flex" justifyContent="center" alignItems="center" py={3}>
            <CircularProgress size={30} />
          </Box>
        </CardContent>
      </Card>
    );
  }

  return (
    <>
      <Card>
        <CardContent>
          <Typography variant="h6" fontWeight="600" gutterBottom color="error">
            Danger Zone
          </Typography>

          {error && (
            <Alert severity="error" sx={{ mb: 2 }} onClose={() => setError(null)}>
              {error}
            </Alert>
          )}

          {success && (
            <Alert severity="success" sx={{ mb: 2 }} onClose={() => setSuccess(null)}>
              {success}
            </Alert>
          )}

          {deletionRequest?.status === 'pending' ? (
            <Box>
              <Alert severity="warning" icon={<Warning />} sx={{ mb: 2 }}>
                <Typography variant="body2" fontWeight="600" gutterBottom>
                  Account Deletion Scheduled
                </Typography>
                <Typography variant="body2">
                  Your account is scheduled for deletion on{' '}
                  <strong>{new Date(deletionRequest.scheduledDeletionAt).toLocaleDateString()}</strong>.
                  You can cancel this request at any time before that date.
                </Typography>
                {deletionRequest.reason && (
                  <Typography variant="body2" sx={{ mt: 1 }}>
                    Reason: {deletionRequest.reason}
                  </Typography>
                )}
              </Alert>

              <Box display="flex" gap={2}>
                <Button
                  variant="outlined"
                  startIcon={<Cancel />}
                  onClick={() => setIsCancelDialogOpen(true)}
                  disabled={isLoading}
                >
                  Cancel Deletion Request
                </Button>
                <Chip
                  label={`${Math.ceil((new Date(deletionRequest.scheduledDeletionAt).getTime() - Date.now()) / (1000 * 60 * 60 * 24))} days remaining`}
                  color="warning"
                  size="small"
                />
              </Box>
            </Box>
          ) : (
            <Box>
              <Typography variant="body2" color="text.secondary" sx={{ mb: 2 }}>
                Permanently delete your account and all associated data. This action cannot be undone after the 30-day grace period.
                This complies with GDPR's Right to Erasure.
              </Typography>
              <Typography variant="body2" color="error" sx={{ mb: 2 }}>
                <strong>Warning:</strong> Deleting your account will remove all your data including children profiles, activities,
                photos, and AI conversations. This data cannot be recovered.
              </Typography>

              <Button
                variant="outlined"
                color="error"
                startIcon={<DeleteForever />}
                onClick={() => setIsDialogOpen(true)}
              >
                Delete My Account
              </Button>
            </Box>
          )}
        </CardContent>
      </Card>

      {/* Delete Account Dialog */}
      <Dialog open={isDialogOpen} onClose={() => !isLoading && setIsDialogOpen(false)} maxWidth="sm" fullWidth>
        <DialogTitle>Delete Account</DialogTitle>
        <DialogContent>
          <DialogContentText sx={{ mb: 2 }}>
            Are you sure you want to delete your account? This will permanently remove all your data after a 30-day grace period.
          </DialogContentText>
          <DialogContentText sx={{ mb: 2 }} color="error">
            <strong>This action will delete:</strong>
          </DialogContentText>
          <ul style={{ marginTop: 0 }}>
            <li>Your profile and account information</li>
            <li>All children profiles and their data</li>
            <li>All activity tracking records</li>
            <li>All photos and attachments</li>
            <li>All AI conversation history</li>
            <li>All family memberships</li>
          </ul>
          <TextField
            fullWidth
            multiline
            rows={3}
            label="Reason for deletion (optional)"
            value={reason}
            onChange={(e) => setReason(e.target.value)}
            placeholder="Help us improve by telling us why you're leaving..."
            sx={{ mt: 2 }}
          />
        </DialogContent>
        <DialogActions>
          <Button onClick={() => setIsDialogOpen(false)} disabled={isLoading}>
            Cancel
          </Button>
          <Button
            onClick={handleRequestDeletion}
            color="error"
            variant="contained"
            disabled={isLoading}
            startIcon={isLoading ? <CircularProgress size={20} /> : <DeleteForever />}
          >
            {isLoading ? 'Processing...' : 'Delete Account'}
          </Button>
        </DialogActions>
      </Dialog>

      {/* Cancel Deletion Dialog */}
      <Dialog
        open={isCancelDialogOpen}
        onClose={() => !isLoading && setIsCancelDialogOpen(false)}
        maxWidth="sm"
        fullWidth
      >
        <DialogTitle>Cancel Account Deletion</DialogTitle>
        <DialogContent>
          <DialogContentText sx={{ mb: 2 }}>
            Are you sure you want to cancel your account deletion request? Your account will remain active.
          </DialogContentText>
          <TextField
            fullWidth
            multiline
            rows={2}
            label="Reason for cancellation (optional)"
            value={cancellationReason}
            onChange={(e) => setCancellationReason(e.target.value)}
            placeholder="Tell us what made you change your mind..."
            sx={{ mt: 2 }}
          />
        </DialogContent>
        <DialogActions>
          <Button onClick={() => setIsCancelDialogOpen(false)} disabled={isLoading}>
            Close
          </Button>
          <Button
            onClick={handleCancelDeletion}
            color="primary"
            variant="contained"
            disabled={isLoading}
            startIcon={isLoading ? <CircularProgress size={20} /> : <Cancel />}
          >
            {isLoading ? 'Processing...' : 'Cancel Deletion'}
          </Button>
        </DialogActions>
      </Dialog>
    </>
  );
}