prets entre utilisateurs

my-library/src/context/LoanContext.js

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+import { createContext, useContext, useState } from 'react';
+
+const LoanContext = createContext(null);
+
+export function LoanProvider({ children }) {
+  const [loans, setLoans] = useState(() => {
+    const saved = localStorage.getItem('loans');
+    return saved ? JSON.parse(saved) : [];
+  });
+
+  function addLoan(book, borrowerPhone, dueDate) {
+    const loan = {
+      loanId: crypto.randomUUID(),
+      bookId: book.isbn,
+      bookTitle: book.title,
+      bookAuthor: book.author,
+      borrowerPhone,
+      dueDate,
+      status: 'ACTIVE',
+      loanedAt: new Date().toISOString(),
+    };
+    const updated = [...loans, loan];
+    setLoans(updated);
+    localStorage.setItem('loans', JSON.stringify(updated));
+    return loan;
+  }
+
+  function returnLoan(loanId) {
+    const updated = loans.map(l =>
+      l.loanId === loanId ? { ...l, status: 'RETURNED' } : l
+    );
+    setLoans(updated);
+    localStorage.setItem('loans', JSON.stringify(updated));
+  }
+
+  return (
+    <LoanContext.Provider value={{ loans, addLoan, returnLoan }}>
+      {children}
+    </LoanContext.Provider>
+  );
+}
+
+export function useLoans() {
+  return useContext(LoanContext);
+}