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* TopicsList Component (Task 12b - GREEN Phase)
*
* Story 2.5.3 - AC7: Topic Management
* Wireframe: docs/wireframes/story-1.16-event-detail-edit.md v1.1 (lines 68-81)
*
* Displays assigned topics with:
* - Topic cards showing title, last used info, partner votes
* - [View] button to show topic details modal
* - [Remove] button with confirmation dialog
* - [+ Add Topic from Backlog] button
* - Empty state, loading state, error state
* - Full i18n support (German/English)
* - WCAG 2.1 AA accessibility
*/
import React, { useState } from 'react';
import {
Box,
Typography,
Card,
CardContent,
CardActions,
Button,
Skeleton,
Alert,
Dialog,
DialogTitle,
DialogContent,
DialogContentText,
DialogActions,
} from '@mui/material';
import Grid from '@mui/material/Grid';
import { Add as AddIcon, Visibility as ViewIcon, Delete as DeleteIcon } from '@mui/icons-material';
import { useTranslation } from 'react-i18next';
import { useNavigate } from 'react-router-dom';
import { useBreakpoints } from '@/hooks/useBreakpoints';
import type { Topic } from '@/types/event.types';
export interface TopicsListProps {
topics?: Topic[];
eventCode: string;
onRemoveTopic: (eventCode: string, topicId: string) => void;
onViewTopic: (topicId: string) => void;
isLoading?: boolean;
error?: Error | null;
}
export const TopicsList: React.FC<TopicsListProps> = ({
topics,
eventCode,
onRemoveTopic,
onViewTopic,
isLoading = false,
error = null,
}) => {
const { t } = useTranslation('events');
const { isMobile } = useBreakpoints();
const navigate = useNavigate();
const [confirmDialogOpen, setConfirmDialogOpen] = useState(false);
const [topicToRemove, setTopicToRemove] = useState<string | null>(null);
const handleRemoveClick = (topicId: string) => {
setTopicToRemove(topicId);
setConfirmDialogOpen(true);
};
const handleConfirmRemove = () => {
Eif (topicToRemove) {
onRemoveTopic(eventCode, topicToRemove);
setConfirmDialogOpen(false);
setTopicToRemove(null);
}
};
const handleCancelRemove = () => {
setConfirmDialogOpen(false);
setTopicToRemove(null);
};
const handleAddTopic = () => {
console.log('[TopicsList] handleAddTopic clicked', { eventCode });
navigate(`/organizer/topics?eventCode=${eventCode}`);
};
const formatLastUsed = (topic: Topic): string => {
if (!topic.lastUsedEvent || !topic.lastUsedDate) {
return t('topics.neverUsed', 'Never');
}
const year = new Date(topic.lastUsedDate).getFullYear();
return t('topics.lastUsed', {
event: topic.lastUsedEvent,
year,
defaultValue: `${topic.lastUsedEvent} (${year})`,
});
};
// Loading state
if (isLoading) {
return (
<Box data-testid="topics-loading" sx={{ mt: 3 }}>
<Skeleton variant="text" width={200} height={40} />
<Grid container spacing={2} sx={{ mt: 1 }}>
{[1, 2, 3].map((i) => (
<Grid size={{ xs: 12, md: 6 }} key={i}>
<Skeleton variant="rectangular" height={150} />
</Grid>
))}
</Grid>
</Box>
);
}
// Error state
if (error) {
return (
<Box sx={{ mt: 3 }}>
<Alert severity="error" sx={{ mb: 2 }}>
{error.message || t('topics.loadError', 'Failed to load topics')}
<Button size="small" sx={{ ml: 2 }} onClick={() => window.location.reload()}>
{t('common.retry', 'Retry')}
</Button>
</Alert>
</Box>
);
}
const topicCount = topics?.length || 0;
return (
<Box sx={{ mt: 3 }}>
{/* Section Title with Count */}
<Typography
variant="h6"
sx={{ mb: 2, fontWeight: 600, textTransform: 'uppercase' }}
aria-label={t('topics.sectionLabel', {
count: topicCount,
defaultValue: `Assigned Topics (${topicCount})`,
})}
>
{t('topics.sectionTitle', {
count: topicCount,
defaultValue: `ASSIGNED TOPICS (${topicCount})`,
})}
</Typography>
{/* Empty State */}
{topicCount === 0 && (
<Box
sx={{
textAlign: 'center',
py: 4,
border: '1px dashed',
borderColor: 'divider',
borderRadius: 1,
mb: 2,
}}
>
<Typography variant="body1" color="text.secondary">
{t('topics.emptyState', 'No topics assigned yet')}
</Typography>
</Box>
)}
{/* Topic Cards Grid */}
{topicCount > 0 && (
<Grid container spacing={2} sx={{ mb: 2 }}>
{topics?.map((topic) => (
<Grid size={{ xs: 12, md: 6 }} key={topic.id}>
<Card
sx={{
height: '100%',
display: 'flex',
flexDirection: 'column',
'&:hover': {
boxShadow: 3,
},
}}
>
<CardContent sx={{ flexGrow: 1 }}>
{/* Topic Title */}
<Typography variant="h6" gutterBottom sx={{ fontWeight: 500 }}>
{topic.title}
</Typography>
{/* Last Used Info */}
<Typography variant="body2" color="text.secondary" sx={{ mb: 0.5 }}>
{t('topics.lastUsedLabel', 'Last used')}:{' '}
<strong>{formatLastUsed(topic)}</strong>
</Typography>
{/* Partner Votes */}
<Typography variant="body2" color="text.secondary">
{t('topics.partnerVotes', 'Partner votes')}:{' '}
<strong>{topic.partnerVotes}</strong>
</Typography>
</CardContent>
{/* Actions */}
<CardActions sx={{ justifyContent: 'flex-end', px: 2, pb: 2 }}>
<Button
size="small"
startIcon={<ViewIcon />}
onClick={() => onViewTopic(topic.id)}
aria-label={t('topics.viewButton', {
title: topic.title,
defaultValue: `View ${topic.title}`,
})}
>
{t('topics.view', 'View')}
</Button>
<Button
size="small"
color="error"
startIcon={<DeleteIcon />}
onClick={() => handleRemoveClick(topic.id)}
aria-label={t('topics.removeButton', {
title: topic.title,
defaultValue: `Remove ${topic.title}`,
})}
>
{t('topics.remove', 'Remove')}
</Button>
</CardActions>
</Card>
</Grid>
))}
</Grid>
)}
{/* Add Topic Button */}
<Button
variant="outlined"
startIcon={<AddIcon />}
onClick={handleAddTopic}
fullWidth
sx={{ mt: 2 }}
aria-label={t('topics.addFromBacklog', 'Add Topic from Backlog')}
>
{t('topics.addFromBacklog', 'Add Topic from Backlog')}
</Button>
{/* Remove Confirmation Dialog */}
<Dialog
open={confirmDialogOpen}
onClose={handleCancelRemove}
fullScreen={isMobile}
aria-labelledby="remove-topic-dialog-title"
aria-describedby="remove-topic-dialog-description"
>
<DialogTitle id="remove-topic-dialog-title">
{t('topics.removeConfirmTitle', 'Remove Topic?')}
</DialogTitle>
<DialogContent>
<DialogContentText id="remove-topic-dialog-description">
{t(
'topics.removeConfirmMessage',
'Are you sure you want to remove this topic from the event?'
)}
</DialogContentText>
</DialogContent>
<DialogActions>
<Button onClick={handleCancelRemove} color="inherit">
{t('common:actions.cancel')}
</Button>
<Button onClick={handleConfirmRemove} color="error" autoFocus>
{t('common.confirm', 'Confirm')}
</Button>
</DialogActions>
</Dialog>
</Box>
);
};
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