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* @file ListStockPage.tsx
* @description
* Stock inventory display with pagination and CSV export.
*
* **Features:**
* - Paginated product listing (10 per page)
* - Product cards showing name, quantity, and total value
* - CSV export of current page
* - Pagination controls (previous/next)
* - Role-based dashboard navigation
* - Help modal support
*
* **CSV Export:**
* Downloads products from current page as CSV file
* Filename: products_page_N.csv
*
* @component
*/
import React, { useState, useEffect } from 'react';
import { useNavigate } from 'react-router-dom';
import ProductService from '../api/ProductService';
import { Product } from '../types/Product';
import { useTranslation } from 'react-i18next';
import HelpModal from '../components/HelpModal';
import '../styles/tailwindCustom.css';
import Header from '../components/Header';
import Footer from '../components/Footer';
const PRODUCTS_PER_PAGE = 10;
/**
* Stock list page component
* @component
* @returns {JSX.Element} Paginated product inventory
*/
const ListStockPage: React.FC = () => {
const { t, i18n } = useTranslation(['translation', 'help']);
const [products, setProducts] = useState<Product[]>([]);
const [totalPages, setTotalPages] = useState(0);
const [currentPage, setCurrentPage] = useState(0);
const [loading, setLoading] = useState(false);
const [error, setError] = useState<string | null>(null);
const [isHelpOpen, setIsHelpOpen] = useState(false);
const navigate = useNavigate();
/**
* Navigate to role-appropriate dashboard
*/
const navigateToDashboard = () => {
const role = localStorage.getItem('role');
if (role === 'ROLE_ADMIN') navigate('/admin');
else if (role === 'ROLE_USER') navigate('/user');
else navigate('/login');
};
// Fetch products for current page
useEffect(() => {
const fetchProducts = async () => {
setLoading(true);
setError(null);
try {
const response = await ProductService.fetchPagedProducts(currentPage, PRODUCTS_PER_PAGE);
if (response && response.content) {
setProducts(response.content);
setTotalPages(response.totalPages || 0);
} else {
setProducts([]);
setTotalPages(0);
}
} catch (err) {
console.error(t('listStock.error.fetch'), err);
setError(t('listStock.error.general'));
} finally {
setLoading(false);
}
};
fetchProducts();
}, [currentPage, t]);
// Re-render help button on language changes
useEffect(() => {
const handleLanguageChange = () => {
setIsHelpOpen((prev) => prev);
};
i18n.on('languageChanged', handleLanguageChange);
return () => {
i18n.off('languageChanged', handleLanguageChange);
};
}, [i18n]);
/**
* Update current page if valid
*/
const handlePageChange = (newPage: number) => {
if (newPage >= 0 && newPage < totalPages) {
setCurrentPage(newPage);
}
};
/**
* Export current page products as CSV
* Format: name,quantity,price,totalValue
*/
const downloadCSV = () => {
if (products.length === 0) {
alert(t('listStock.alert.noProducts'));
return;
}
const csvHeader = `${t('listStock.csvHeader.name')},${t('listStock.csvHeader.quantity')},${t('listStock.csvHeader.price')},${t('listStock.csvHeader.totalValue')}\n`;
const csvRows = products
.map((product) => `${product.name},${product.quantity},${product.price},${product.totalValue}`)
.join('\n');
const csvContent = csvHeader + csvRows;
const blob = new Blob([csvContent], { type: 'text/csv' });
const url = URL.createObjectURL(blob);
const link = document.createElement('a');
link.href = url;
link.download = `products_page_${currentPage + 1}.csv`;
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
};
if (loading) return <div>{t('loading')}</div>;
Iif (error) return <div className="text-red-500">{error}</div>;
return (
<div className="flex flex-col min-h-screen bg-gray-50">
<Header isLoggedIn={true} onLogout={() => navigate('/login')} />
<div className="absolute top-4 left-1/2 transform -translate-x-1/2">
<button
onClick={() => setIsHelpOpen(true)}
className="button-secondary"
key={i18n.language}
>
{t('button', { ns: 'help' })}
</button>
</div>
<HelpModal isOpen={isHelpOpen} onClose={() => setIsHelpOpen(false)} pageKey="listStock" />
<main className="w-full max-w-4xl p-6 bg-white shadow-lg rounded mx-auto mt-6">
<div className="flex justify-between items-center mb-4">
<h2 className="text-xl font-semibold">{t('listStock.totalStock')}</h2>
<button className="button-primary px-3 py-2 h-10 min-w-[120px] max-w-[180px] text-sm" onClick={downloadCSV}>
{t('listStock.downloadCSV')}
</button>
</div>
{products.length > 0 ? (
<div className="grid grid-cols-1 sm:grid-cols-2 md:grid-cols-3 gap-4">
{products.map((product) => (
<div key={product.id} className="product-card">
<p>
<strong>{t('listStock.labels.name')}:</strong> {product.name}
</p>
<p>
<strong>{t('listStock.labels.quantity')}:</strong> {product.quantity}
</p>
<p>
<strong>{t('listStock.labels.totalValue')}:</strong> ${product.totalValue?.toFixed(2)}
</p>
</div>
))}
</div>
) : (
<p className="text-center text-gray-500">{t('listStock.noProducts')}</p>
)}
<div className="mt-6 flex justify-center gap-4">
<button
className="button-secondary"
disabled={currentPage === 0}
onClick={() => handlePageChange(currentPage - 1)}
>
{t('listStock.pagination.previous')}
</button>
<span>
{t('listStock.pagination.page')} {currentPage + 1} {t('listStock.pagination.of')} {totalPages}
</span>
<button
className="button-secondary"
disabled={currentPage === totalPages - 1}
onClick={() => handlePageChange(currentPage + 1)}
>
{t('listStock.pagination.next')}
</button>
</div>
</main>
<div className="mt-6 flex justify-center">
<button className="logout-button" onClick={navigateToDashboard}>
{t('listStock.backToDashboard')}
</button>
</div>
<Footer />
</div>
);
};
export default ListStockPage;
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