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Alert,
AlertColor,
Button,
Container,
IconButton,
List,
ListItem,
ListItemText,
Stack,
TextField,
Typography,
} from '@mui/material';
import CheckIcon from '@mui/icons-material/Check';
import CloseIcon from '@mui/icons-material/Close';
import DeleteIcon from '@mui/icons-material/Delete';
import EditIcon from '@mui/icons-material/Edit';
import { useMemo, useState } from 'react';
import { v4 as uuidv4 } from 'uuid';
import { useDatabase } from '../context/DBProvider';
import { useCategories, useProducts } from '../hooks/dataHooks';
export const ManageCategoriesScreen = () => {
const db = useDatabase();
const categories = useCategories();
const products = useProducts();
const [name, setName] = useState('');
const [editingCategoryId, setEditingCategoryId] = useState<string | null>(null);
const [editName, setEditName] = useState('');
const [feedback, setFeedback] = useState<{ text: string; severity: AlertColor } | null>(null);
const usageByCategory = useMemo(() => {
return products.reduce<Record<string, number>>((acc, product) => {
acc[product.category] = (acc[product.category] ?? 0) + 1;
return acc;
}, {});
}, [products]);
const addCategory = async () => {
const trimmed = name.trim();
Iif (!trimmed) return;
const exists = categories.some((category) => category.name.toLowerCase() === trimmed.toLowerCase());
if (exists) {
setFeedback({ text: 'A category with this name already exists.', severity: 'error' });
return;
}
await db.categories.add({ id: uuidv4(), name: trimmed, created_at: Date.now(), updated_at: Date.now() });
setName('');
setFeedback({ text: 'Category added.', severity: 'success' });
};
const startEditing = (categoryId: string, currentName: string) => {
setEditingCategoryId(categoryId);
setEditName(currentName);
setFeedback(null);
};
const saveCategory = async () => {
Iif (!editingCategoryId) return;
const trimmed = editName.trim();
Iif (!trimmed) return;
const category = categories.find((item) => item.id === editingCategoryId);
Iif (!category) return;
const nameExists = categories.some(
(item) => item.id !== editingCategoryId && item.name.toLowerCase() === trimmed.toLowerCase(),
);
Iif (nameExists) {
setFeedback({ text: 'A category with this name already exists.', severity: 'error' });
return;
}
await db.transaction('rw', db.categories, db.products, async () => {
await db.categories.update(editingCategoryId, { name: trimmed, updated_at: Date.now() });
await db.products
.where('category')
.equals(category.name)
.modify({ category: trimmed, updated_at: Date.now() });
});
setEditingCategoryId(null);
setEditName('');
setFeedback({ text: 'Category updated. Linked products were refreshed.', severity: 'success' });
};
const cancelEditing = () => {
setEditingCategoryId(null);
setEditName('');
setFeedback(null);
};
const deleteCategory = async (categoryId: string, categoryName: string) => {
const usageCount = usageByCategory[categoryName] ?? 0;
Eif (usageCount > 0) {
setFeedback({
text: `Cannot delete '${categoryName}' while ${usageCount} product(s) use it. Update those products first.`,
severity: 'error',
});
return;
}
await db.categories.delete(categoryId);
if (editingCategoryId === categoryId) {
cancelEditing();
}
setFeedback({ text: 'Category deleted.', severity: 'success' });
};
return (
<Container sx={{ py: 4 }}>
<Typography variant="h5" gutterBottom>
Manage Categories
</Typography>
<Stack spacing={2}>
{feedback ? <Alert severity={feedback.severity}>{feedback.text}</Alert> : null}
<Stack direction="row" spacing={1}>
<TextField
fullWidth
label="Category name"
value={name}
onChange={(event) => setName(event.target.value)}
/>
<Button variant="contained" onClick={addCategory} disabled={!name.trim()}>
Add
</Button>
</Stack>
<List>
{categories.map((category) => (
<ListItem key={category.id} divider>
{editingCategoryId === category.id ? (
<Stack direction="row" alignItems="center" spacing={1} sx={{ width: '100%' }}>
<TextField
size="small"
fullWidth
value={editName}
onChange={(event) => setEditName(event.target.value)}
/>
<IconButton color="primary" onClick={saveCategory} disabled={!editName.trim()} aria-label="Save category">
<CheckIcon />
</IconButton>
<IconButton onClick={cancelEditing} aria-label="Cancel editing">
<CloseIcon />
</IconButton>
</Stack>
) : (
<Stack direction="row" alignItems="center" spacing={1} sx={{ width: '100%' }}>
<ListItemText primary={category.name} secondary={`Used by ${usageByCategory[category.name] ?? 0} product(s)`} />
<Stack direction="row" spacing={0.5}>
<IconButton
onClick={() => startEditing(category.id, category.name)}
aria-label={`Edit ${category.name}`}
size="small"
>
<EditIcon fontSize="small" />
</IconButton>
<IconButton
onClick={() => deleteCategory(category.id, category.name)}
aria-label={`Delete ${category.name}`}
size="small"
>
<DeleteIcon fontSize="small" />
</IconButton>
</Stack>
</Stack>
)}
</ListItem>
))}
</List>
</Stack>
</Container>
);
};
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