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* AddParticipantDialog (Epic 14 follow-up — organizer "Add participant")
*
* Lets an organizer add an EXISTING BATbern user onto an event directly as a `confirmed`
* participant — no self-registration / email-confirmation step. The user is chosen via the
* shared `UserAutocomplete` (the same picker the speaker kanban uses to promote a READY
* speaker); there is deliberately no "add by email / new person" path.
*
* Capacity: a full event returns 409 with `details.code = "capacity_exceeded"`; the dialog
* then offers an explicit "add anyway" that re-submits with `force=true`.
*/
import React, { useState } from 'react';
import {
Alert,
Button,
Checkbox,
Dialog,
DialogActions,
DialogContent,
DialogTitle,
FormControlLabel,
Stack,
} from '@mui/material';
import { useQueryClient } from '@tanstack/react-query';
import { useTranslation } from 'react-i18next';
import { UserAutocomplete } from '@/components/shared/UserAutocomplete';
import type { UserSearchResponse } from '@/types/user.types';
import { addParticipant } from '@/services/api/eventRegistrationService';
interface AddParticipantDialogProps {
open: boolean;
onClose: () => void;
eventCode: string;
/** Notifies the parent so it can show a success snackbar. */
onAdded?: (attendeeName: string) => void;
}
/** Narrow an axios-style error to the backend ErrorResponse `details.code`, if any. */
function errorDetailCode(err: unknown): string | undefined {
const data = (err as { response?: { data?: { details?: { code?: string } } } })?.response?.data;
return data?.details?.code;
}
function errorStatus(err: unknown): number | undefined {
return (err as { response?: { status?: number } })?.response?.status;
}
export const AddParticipantDialog: React.FC<AddParticipantDialogProps> = ({
open,
onClose,
eventCode,
onAdded,
}) => {
const { t } = useTranslation('events');
const queryClient = useQueryClient();
const [selectedUser, setSelectedUser] = useState<UserSearchResponse | null>(null);
const [notify, setNotify] = useState(true);
const [submitting, setSubmitting] = useState(false);
const [error, setError] = useState<string | null>(null);
// Set when the event is full → the primary button becomes "Add anyway" (force).
const [capacityFull, setCapacityFull] = useState(false);
const reset = (): void => {
setSelectedUser(null);
setNotify(true);
setSubmitting(false);
setError(null);
setCapacityFull(false);
};
const handleClose = (): void => {
if (submitting) return;
reset();
onClose();
};
const submit = async (force: boolean): Promise<void> => {
Iif (!selectedUser) return;
setSubmitting(true);
setError(null);
try {
await addParticipant(eventCode, { username: selectedUser.id, force, notify });
// Mirror the promote-from-waitlist invalidations so the list + count badge refresh.
queryClient.invalidateQueries({ queryKey: ['event-registrations', eventCode] });
queryClient.invalidateQueries({ queryKey: ['events', eventCode] });
queryClient.invalidateQueries({ queryKey: ['event', eventCode] });
const name =
`${selectedUser.firstName ?? ''} ${selectedUser.lastName ?? ''}`.trim() || selectedUser.id;
reset();
onClose();
onAdded?.(name);
} catch (err) {
if (errorStatus(err) === 409 && errorDetailCode(err) === 'capacity_exceeded') {
// Offer the explicit override (NFR1 — consequential action confirmed).
setCapacityFull(true);
setError(
t(
'eventPage.participantsTab.addParticipantFull',
'This event is full. Add this participant over capacity anyway?'
)
);
} else if (errorStatus(err) === 409) {
setError(
t(
'eventPage.participantsTab.addParticipantDuplicate',
'This user is already registered for this event.'
)
);
} else E{
setError(
t('eventPage.participantsTab.addParticipantError', 'Could not add this participant.')
);
}
setSubmitting(false);
}
};
return (
<Dialog open={open} onClose={handleClose} maxWidth="sm" fullWidth>
<DialogTitle>
{t('eventPage.participantsTab.addParticipantTitle', 'Add participant')}
</DialogTitle>
<DialogContent>
<Stack spacing={2} sx={{ mt: 1 }} data-testid="add-participant-dialog">
{error && (
<Alert
severity={capacityFull ? 'warning' : 'error'}
data-testid="add-participant-error"
>
{error}
</Alert>
)}
<UserAutocomplete
value={selectedUser}
onChange={(u) => {
setSelectedUser(u);
setCapacityFull(false);
setError(null);
}}
label={t('eventPage.participantsTab.addParticipantUserLabel', 'User')}
data-testid="add-participant-user"
/>
<FormControlLabel
control={
<Checkbox
checked={notify}
onChange={(e) => setNotify(e.target.checked)}
data-testid="add-participant-notify"
/>
}
label={t(
'eventPage.participantsTab.addParticipantNotify',
'Notify the participant by email'
)}
/>
</Stack>
</DialogContent>
<DialogActions>
<Button onClick={handleClose} disabled={submitting}>
{t('common:actions.cancel', 'Cancel')}
</Button>
<Button
variant="contained"
onClick={() => submit(capacityFull)}
disabled={!selectedUser || submitting}
data-testid="add-participant-confirm"
>
{capacityFull
? t('eventPage.participantsTab.addParticipantForce', 'Add anyway')
: t('eventPage.participantsTab.addParticipant', 'Add participant')}
</Button>
</DialogActions>
</Dialog>
);
};
export default AddParticipantDialog;
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