Feature: barcode lookup with auto-fill and owned detection

app.js

@@ -20,6 +20,7 @@ const gameForm = document.getElementById("gameForm");
 const brandInput = document.getElementById("brandInput");
 const consoleInput = document.getElementById("consoleInput");
 const titleInput = document.getElementById("titleInput");
+const barcodeInput = document.getElementById("barcodeInput");
 const versionInput = document.getElementById("versionInput");
 const genreInput = document.getElementById("genreInput");
 const publisherInput = document.getElementById("publisherInput");
@@ -241,6 +242,7 @@ gameForm.addEventListener("submit", async (event) => {
       brand: state.selectedBrand,
       consoleName: state.selectedConsole,
       title,
+      barcode: barcodeInput.value.trim(),
       version: versionInput.value.trim(),
       genre: genreInput.value.trim(),
       publisher: publisherInput.value.trim(),
@@ -283,6 +285,7 @@ gameForm.addEventListener("submit", async (event) => {
       games[idx] = {
         ...games[idx],
         title,
+        barcode: barcodeInput.value.trim(),
         version: versionInput.value.trim(),
         genre: genreInput.value.trim(),
         publisher: publisherInput.value.trim(),
@@ -298,6 +301,7 @@ gameForm.addEventListener("submit", async (event) => {
     const game = {
       id: crypto.randomUUID(),
       title,
+      barcode: barcodeInput.value.trim(),
       version: versionInput.value.trim(),
       genre: genreInput.value.trim(),
       publisher: publisherInput.value.trim(),
@@ -686,6 +690,7 @@ function buildGamePayload(game, brand, consoleName, overrides = {}) {
     brand,
     consoleName,
     title: game.title || "",
+    barcode: game.barcode || "",
     version: game.version || "",
     genre: game.genre || "",
     publisher: game.publisher || "",
@@ -865,6 +870,7 @@ function renderGames() {
 
     const metaParts = [
       showLoanedOnly ? `${game.brand} / ${game.consoleName}` : null,
+      game.barcode ? `Code: ${game.barcode}` : null,
       game.version ? `Version: ${game.version}` : null,
       game.genre ? `Genre: ${game.genre}` : null,
       game.publisher ? `Editeur: ${game.publisher}` : null,
@@ -898,6 +904,7 @@ function renderGames() {
 function startEditMode(game) {
   editingGameId = game.id;
   titleInput.value = game.title || "";
+  barcodeInput.value = game.barcode || "";
   versionInput.value = game.version || "";
   genreInput.value = game.genre || "";
   publisherInput.value = game.publisher || "";
@@ -1029,6 +1036,10 @@ async function scanLoop() {
 }
 
 function applyScannedCode(codeValue) {
+  if (barcodeInput) {
+    barcodeInput.value = codeValue;
+  }
+
   if (scannerLastCode) {
     scannerLastCode.textContent = `Dernier code detecte: ${codeValue}`;
     scannerLastCode.classList.remove("hidden");
@@ -1043,6 +1054,63 @@ function applyScannedCode(codeValue) {
   if (titleInput && !normalizeText(titleInput.value)) {
     titleInput.value = codeValue;
   }
+
+  lookupScannedBarcode(codeValue).catch((error) => {
+    console.error(error);
+    updateScannerStatus(`Code detecte: ${codeValue} (lookup indisponible).`);
+  });
+}
+
+async function lookupScannedBarcode(codeValue) {
+  const normalized = normalizeText(codeValue);
+  if (!normalized) {
+    return;
+  }
+
+  const result = await apiRequest(`/api/barcode/lookup/${encodeURIComponent(normalized)}`, { timeoutMs: 7000 });
+  if (!result || result.status !== "ok") {
+    updateScannerStatus(`Code detecte: ${normalized}`);
+    return;
+  }
+
+  const owned = result.owned && result.game;
+  if (owned) {
+    const ownedTitle = normalizeText(result.game.title) || "Jeu inconnu";
+    const ownedConsole = normalizeText(result.game.consoleName);
+    const ownedLabel = ownedConsole ? `${ownedTitle} (${ownedConsole})` : ownedTitle;
+    updateScannerStatus(`Deja possede: ${ownedLabel}`);
+    alert(`Deja dans ta collection: ${ownedLabel}`);
+
+    if (quickSearchInput) {
+      quickSearchInput.value = ownedTitle;
+      quickSearchTerm = ownedTitle;
+      renderSearchResults();
+    }
+    if (titleInput) {
+      titleInput.value = ownedTitle;
+    }
+    if (publisherInput && !normalizeText(publisherInput.value) && result.game.publisher) {
+      publisherInput.value = result.game.publisher;
+    }
+    return;
+  }
+
+  const hasAutoData = result.lookup && normalizeText(result.lookup.title);
+  if (hasAutoData) {
+    titleInput.value = result.lookup.title;
+    if (publisherInput && !normalizeText(publisherInput.value) && result.lookup.publisher) {
+      publisherInput.value = result.lookup.publisher;
+    }
+    if (quickSearchInput) {
+      quickSearchInput.value = result.lookup.title;
+      quickSearchTerm = result.lookup.title;
+      renderSearchResults();
+    }
+    updateScannerStatus(`Titre trouve automatiquement: ${result.lookup.title}`);
+    return;
+  }
+
+  updateScannerStatus(`Code detecte: ${normalized} (aucune fiche auto).`);
 }
 
 function normalizeText(value) {