feat: Implement loan management features including fetching, creating, and deleting loans
- Added database functions for managing loans: getLoans, getUserLoans, deleteLoan, and createLoan. - Updated frontend to include new Form4 for displaying user loans and handling loan deletions. - Replaced Form3 with Form4 in App component. - Enhanced Form1 to set borrowing dates and fetch available items. - Improved Form2 to display borrowable items and allow selection for loans. - Introduced utility functions for handling loan creation and deletion in userHandler. - Added event listeners for local storage updates to keep UI in sync. - Updated fetchData utility to retrieve loans and user loans from the backend.
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@@ -41,3 +41,211 @@ export const getItemsFromDatabase = async (role) => {
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}
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return { success: false };
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};
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export const getLoansFromDatabase = async () => {
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const [result] = await pool.query("SELECT * FROM loans;");
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if (result.length > 0) {
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return { success: true, data: result };
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}
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return { success: false };
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};
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export const getUserLoansFromDatabase = async (username) => {
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const [result] = await pool.query("SELECT * FROM loans WHERE username = ?;", [
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username,
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]);
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if (result.length > 0) {
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return { success: true, data: result };
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} else if (result.length == 0) {
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return { success: true, data: "No loans found for this user" };
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} else {
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return { success: false };
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}
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};
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export const deleteLoanFromDatabase = async (loanId) => {
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const [result] = await pool.query("DELETE FROM loans WHERE id = ?;", [
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loanId,
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]);
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if (result.affectedRows > 0) {
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return { success: true };
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} else {
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return { success: false };
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}
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};
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export const getBorrowableItemsFromDatabase = async (
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startDate,
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endDate,
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role = 0
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) => {
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// Overlap if: loan.start < end AND effective_end > start
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// effective_end is returned_date if set, otherwise end_date
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const hasRoleFilter = Number(role) > 0;
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const sql = `
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SELECT i.*
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FROM items i
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WHERE ${hasRoleFilter ? "i.can_borrow_role >= ? AND " : ""}NOT EXISTS (
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SELECT 1
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FROM loans l
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JOIN JSON_TABLE(l.loaned_items_id, '$[*]' COLUMNS (item_id INT PATH '$')) jt
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WHERE jt.item_id = i.id
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AND l.start_date < ?
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AND COALESCE(l.returned_date, l.end_date) > ?
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);
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`;
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const params = hasRoleFilter
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? [role, endDate, startDate]
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: [endDate, startDate];
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const [rows] = await pool.query(sql, params);
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if (rows.length > 0) {
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return { success: true, data: rows };
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}
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return { success: false };
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};
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export const createLoanInDatabase = async (
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username,
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startDate,
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endDate,
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itemIds
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) => {
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if (!username)
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return { success: false, code: "BAD_REQUEST", message: "Missing username" };
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if (!Array.isArray(itemIds) || itemIds.length === 0)
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return {
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success: false,
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code: "BAD_REQUEST",
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message: "No items provided",
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};
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if (!startDate || !endDate)
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return { success: false, code: "BAD_REQUEST", message: "Missing dates" };
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const start = new Date(startDate);
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const end = new Date(endDate);
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if (
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!(start instanceof Date) ||
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isNaN(start.getTime()) ||
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!(end instanceof Date) ||
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isNaN(end.getTime()) ||
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start >= end
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) {
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return {
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success: false,
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code: "BAD_REQUEST",
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message: "Invalid date range",
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};
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}
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const conn = await pool.getConnection();
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try {
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await conn.beginTransaction();
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// Ensure all items exist and collect names
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const [itemsRows] = await conn.query(
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"SELECT id, item_name FROM items WHERE id IN (?)",
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[itemIds]
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);
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if (!itemsRows || itemsRows.length !== itemIds.length) {
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await conn.rollback();
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return {
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success: false,
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code: "BAD_REQUEST",
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message: "One or more items not found",
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};
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}
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const itemNames = itemIds
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.map(
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(id) => itemsRows.find((r) => Number(r.id) === Number(id))?.item_name
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)
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.filter(Boolean);
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// Check availability (no overlap with existing loans)
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const [confRows] = await conn.query(
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`
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SELECT COUNT(*) AS conflicts
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FROM loans l
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JOIN JSON_TABLE(l.loaned_items_id, '$[*]' COLUMNS (item_id INT PATH '$')) jt
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ON TRUE
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WHERE jt.item_id IN (?)
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AND l.start_date < ?
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AND COALESCE(l.returned_date, l.end_date) > ?
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`,
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[itemIds, end, start]
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);
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if (confRows?.[0]?.conflicts > 0) {
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await conn.rollback();
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return {
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success: false,
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code: "CONFLICT",
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message: "One or more items are not available in the selected period",
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};
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}
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// Generate unique loan_code (retry a few times)
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let loanCode = null;
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for (let i = 0; i < 6; i++) {
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const candidate = Math.floor(1000 + Math.random() * 900000); // 4-6 digits
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const [exists] = await conn.query(
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"SELECT 1 FROM loans WHERE loan_code = ? LIMIT 1",
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[candidate]
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);
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if (exists.length === 0) {
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loanCode = candidate;
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break;
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}
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}
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if (!loanCode) {
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await conn.rollback();
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return {
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success: false,
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code: "SERVER_ERROR",
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message: "Failed to generate unique loan code",
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};
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}
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// Insert loan
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const [insertRes] = await conn.query(
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`
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INSERT INTO loans (username, loan_code, start_date, end_date, loaned_items_id, loaned_items_name)
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VALUES (?, ?, ?, ?, CAST(? AS JSON), CAST(? AS JSON))
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`,
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[
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username,
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loanCode,
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// Use DATETIME/TIMESTAMP friendly format
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new Date(start).toISOString().slice(0, 19).replace("T", " "),
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new Date(end).toISOString().slice(0, 19).replace("T", " "),
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JSON.stringify(itemIds.map((n) => Number(n))),
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JSON.stringify(itemNames),
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]
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);
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await conn.commit();
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return {
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success: true,
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data: {
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id: insertRes.insertId,
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loan_code: loanCode,
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username,
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start_date: start,
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end_date: end,
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items: itemIds,
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item_names: itemNames,
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},
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};
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} catch (err) {
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await conn.rollback();
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console.error("createLoanInDatabase error:", err);
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return {
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success: false,
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code: "SERVER_ERROR",
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message: "Failed to create loan",
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};
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} finally {
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conn.release();
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}
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};
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