Add barcode scanner integration, identifier lookup, and enhanced field mapping for label creation

src/features/labels/label-create-page.js

@@ -1,8 +1,11 @@
 import {
   applyItemUpsert,
+  lookupItemByIdentifier,
   previewItemUpsert,
   searchItemDefinitions,
 } from '../../api/stock.js';
+import { BrowserMultiFormatReader } from '@zxing/browser';
+import { mapLookupItemToForm } from './identifier-lookup-mapper.js';
 import { fetchLocations } from '../../api/locations.js';
 import {
   formatPrintErrorMessage,
@@ -54,28 +57,75 @@ export function renderLabelCreatePage() {
             <div class="card border-0 shadow-sm">
             <div class="card-body p-4">
               <form class="vstack gap-3" @submit.prevent="create()" autocomplete="off" x-ref="labelForm">
-                <div class="position-relative search-field-with-clear">
-                  <label class="form-label">Search item definitions</label>
-                  <input class="form-control pe-5" type="text" x-model="form.search" @input="onSearchInput()" placeholder="Search by item name" autocomplete="off" />
-                  <button
-                    type="button"
-                    class="btn btn-sm btn-link text-body-secondary clear-field-button search-clear-button"
-                    x-show="form.search || form.itemId"
-                    @click="clearItemSearch()"
-                    aria-label="Clear item search"
-                  >
-                    &times;
-                  </button>
-                  <template x-if="suggestions.length">
-                    <div class="list-group shadow-sm position-absolute start-0 end-0 z-3 mt-1 search-suggestions-picker">
-                      <template x-for="item in suggestions" :key="item.id">
-                        <button class="list-group-item list-group-item-action" type="button" @click="pickSuggestion(item)">
-                          <div class="fw-semibold" x-text="item.name"></div>
-                          <div class="small text-body-secondary" x-text="item.description || 'Existing item definition'"></div>
-                        </button>
-                      </template>
+                <div class="row g-3 align-items-start">
+                  <div class="col-12 col-md-6 position-relative search-field-with-clear">
+                    <label class="form-label">Search item definitions</label>
+                    <input class="form-control pe-5" type="text" x-model="form.search" @input="onSearchInput()" placeholder="Search by item name" autocomplete="off" />
+                    <button
+                      type="button"
+                      class="btn btn-sm btn-link text-body-secondary clear-field-button search-clear-button"
+                      x-show="form.search || form.itemId"
+                      @click="clearItemSearch()"
+                      aria-label="Clear item search"
+                    >
+                      &times;
+                    </button>
+                    <template x-if="suggestions.length">
+                      <div class="list-group shadow-sm position-absolute start-0 end-0 z-3 mt-1 search-suggestions-picker">
+                        <template x-for="item in suggestions" :key="item.id">
+                          <button class="list-group-item list-group-item-action" type="button" @click="pickSuggestion(item)">
+                            <div class="fw-semibold" x-text="item.name"></div>
+                            <div class="small text-body-secondary" x-text="item.description || 'Existing item definition'"></div>
+                          </button>
+                        </template>
+                      </div>
+                    </template>
+                  </div>
+                  <div class="col-12 col-md-6">
+                    <label class="form-label">Identifier code</label>
+                    <div class="input-group">
+                      <input
+                        class="form-control"
+                        type="text"
+                        x-model="form.identifierCode"
+                        @input="lookupState.error = ''"
+                        inputmode="numeric"
+                        autocomplete="off"
+                        placeholder="EAN / UPC / GTIN"
+                      />
+                      <button
+                        class="btn btn-outline-primary"
+                        type="button"
+                        @click="lookupIdentifierDetails()"
+                        :disabled="lookupState.isLoading || !hasLookupIdentifierCode()"
+                      >
+                        <span x-show="!lookupState.isLoading">Lookup</span>
+                        <span x-show="lookupState.isLoading">Looking up...</span>
+                      </button>
+                      <button
+                        class="btn btn-outline-secondary"
+                        type="button"
+                        @click="openScanner()"
+                        x-show="scannerState.hasCamera"
+                      >
+                        Camera
+                      </button>
+                      <button
+                        class="btn btn-outline-secondary"
+                        type="button"
+                        x-show="form.identifierCode"
+                        @click="form.identifierCode = ''"
+                      >
+                        Clear
+                      </button>
                     </div>
-                  </template>
+                    <div class="form-text">
+                      Optional. Scan with camera or enter manually.
+                    </div>
+                    <template x-if="lookupState.error">
+                      <div class="small text-danger mt-1" x-text="lookupState.error"></div>
+                    </template>
+                  </div>
                 </div>
 
                 <div class="row g-3">
@@ -470,6 +520,39 @@ export function renderLabelCreatePage() {
           </div>
         </div>
       </div>
+
+      <div
+        class="scanner-modal-backdrop"
+        x-show="scannerState.isOpen"
+        @click.self="closeScanner()"
+        @keydown.escape.window="closeScanner()"
+      >
+        <div class="scanner-modal card border-0 shadow-lg">
+          <div class="card-body p-3 p-md-4">
+            <div class="d-flex align-items-center justify-content-between gap-3 mb-3">
+              <div>
+                <h2 class="h5 mb-1">Scan barcode</h2>
+                <p class="text-body-secondary small mb-0">Point your camera at the barcode to fill the identifier field.</p>
+              </div>
+              <button class="btn btn-sm btn-outline-secondary" type="button" @click="closeScanner()">Close</button>
+            </div>
+
+            <div class="scanner-video-shell mb-3">
+              <video class="scanner-video" x-ref="scannerVideo" autoplay muted playsinline></video>
+            </div>
+
+            <div class="d-flex flex-wrap align-items-center gap-2">
+              <div class="small text-body-secondary" x-show="scannerState.isLoading">Starting camera...</div>
+              <div class="small text-success" x-show="scannerState.lastDetectedCode" x-text="'Detected: ' + scannerState.lastDetectedCode"></div>
+              <button class="btn btn-outline-secondary btn-sm" type="button" @click="startScanner()" :disabled="scannerState.isLoading">Retry</button>
+            </div>
+
+            <template x-if="scannerState.error">
+              <div class="alert alert-warning py-2 mt-3 mb-0" x-text="scannerState.error"></div>
+            </template>
+          </div>
+        </div>
+      </div>
     </section>
   `;
 }
@@ -559,6 +642,7 @@ export function labelCreatePageData(store) {
   return {
     previewState: createAsyncState(),
     createState: createAsyncState(),
+    lookupState: createAsyncState(),
     stockTypeOptions: STOCK_TYPE_OPTIONS,
     stockLevelOptions: STOCK_LEVEL_OPTIONS,
     quantityUnitOptions: QUANTITY_UNIT_OPTIONS,
@@ -577,10 +661,20 @@ export function labelCreatePageData(store) {
     upsertPreview: null,
     printLabelOnSave: true,
     printIssue: '',
+    scannerReader: null,
+    scannerControls: null,
+    scannerState: {
+      isOpen: false,
+      isLoading: false,
+      hasCamera: false,
+      error: '',
+      lastDetectedCode: '',
+    },
     form: {
       ...loadLabelDraft(),
     },
     async init() {
+      this.scannerState.hasCamera = this.canUseCameraScanner();
       if (!store.isConnected) {
         return;
       }
@@ -614,6 +708,243 @@ export function labelCreatePageData(store) {
         this.suggestions = await searchItemDefinitions(store, this.form.search.trim());
       }, 250);
     },
+    destroy() {
+      this.stopScanner();
+    },
+    canUseCameraScanner() {
+      return Boolean(
+        typeof navigator !== 'undefined'
+        && navigator.mediaDevices
+        && typeof navigator.mediaDevices.getUserMedia === 'function',
+      );
+    },
+    normalizeIdentifierCode(value) {
+      return String(value || '').replace(/\s+/g, '').trim();
+    },
+    hasLookupIdentifierCode() {
+      return Boolean(this.normalizeIdentifierCode(this.form.identifierCode));
+    },
+    lookupStatusMessage(status, identifierCode) {
+      const normalizedCode = this.normalizeIdentifierCode(identifierCode);
+
+      if (!normalizedCode || status === 'missing_identifier') {
+        return 'Provide an identifier code before lookup.';
+      }
+
+      if (status === 'not_found') {
+        return `No lookup result found for code ${normalizedCode}.`;
+      }
+
+      if (status === 'lookup_failed') {
+        return 'Lookup failed on the server. You can still fill the form manually.';
+      }
+
+      return 'Lookup response could not be applied to this form.';
+    },
+    normalizeScannerError(error) {
+      const message = String(error?.message || '');
+      const normalized = message.toLowerCase();
+
+      if (error?.name === 'NotAllowedError' || normalized.includes('permission')) {
+        return 'Camera access was denied. Allow access to scan, or enter the code manually.';
+      }
+
+      if (error?.name === 'NotFoundError' || normalized.includes('requested device not found')) {
+        return 'No camera was found on this device. Enter the identifier code manually.';
+      }
+
+      if (error?.name === 'NotReadableError' || normalized.includes('could not start video source')) {
+        return 'Camera is busy in another app. Close it there and try scanning again.';
+      }
+
+      return 'Could not start barcode scanning. Enter the identifier code manually.';
+    },
+    async openScanner() {
+      this.scannerState.error = '';
+      this.scannerState.lastDetectedCode = '';
+      this.scannerState.isOpen = true;
+      await this.$nextTick();
+      await this.startScanner();
+    },
+    async startScanner() {
+      this.scannerState.error = '';
+      this.scannerState.lastDetectedCode = '';
+
+      if (!this.canUseCameraScanner()) {
+        this.scannerState.hasCamera = false;
+        this.scannerState.error = 'Camera scanning is not supported in this browser. Enter the identifier code manually.';
+        return;
+      }
+
+      const videoElement = this.$refs.scannerVideo;
+      if (!videoElement) {
+        this.scannerState.error = 'Scanner video element is unavailable. Close and reopen scanner.';
+        return;
+      }
+
+      this.stopScanner();
+      this.scannerState.isLoading = true;
+
+      try {
+        if (!this.scannerReader) {
+          this.scannerReader = new BrowserMultiFormatReader();
+        }
+
+        this.scannerControls = await this.scannerReader.decodeFromConstraints(
+          {
+            audio: false,
+            video: {
+              facingMode: { ideal: 'environment' },
+            },
+          },
+          videoElement,
+          (result, error) => {
+            if (result) {
+              this.onBarcodeDetected(result.getText?.() || '');
+              return;
+            }
+
+            if (!error || error?.name === 'NotFoundException') {
+              return;
+            }
+
+            if (!this.scannerState.error) {
+              this.scannerState.error = this.normalizeScannerError(error);
+            }
+          },
+        );
+      } catch (error) {
+        this.scannerState.error = this.normalizeScannerError(error);
+      } finally {
+        this.scannerState.isLoading = false;
+      }
+    },
+    stopScanner() {
+      try {
+        this.scannerControls?.stop?.();
+      } catch {
+        // Ignore cleanup errors when scanner is already stopped.
+      }
+      this.scannerControls = null;
+
+      try {
+        this.scannerReader?.reset?.();
+      } catch {
+        // Ignore cleanup errors from stale reader state.
+      }
+
+      const videoElement = this.$refs.scannerVideo;
+      const stream = videoElement?.srcObject;
+      if (stream && typeof stream.getTracks === 'function') {
+        stream.getTracks().forEach((track) => track.stop());
+      }
+      if (videoElement) {
+        videoElement.srcObject = null;
+      }
+    },
+    closeScanner() {
+      this.stopScanner();
+      this.scannerState.isOpen = false;
+      this.scannerState.isLoading = false;
+      this.scannerState.error = '';
+    },
+    onBarcodeDetected(rawCode) {
+      const code = this.normalizeIdentifierCode(rawCode);
+      if (!code || !this.scannerState.isOpen) {
+        return;
+      }
+
+      this.form.identifierCode = code;
+      this.scannerState.lastDetectedCode = code;
+      this.closeScanner();
+      store.addAlert({
+        type: 'success',
+        message: `Scanned identifier code: ${code}`,
+      });
+    },
+    async lookupIdentifierDetails() {
+      const identifierCode = this.normalizeIdentifierCode(this.form.identifierCode);
+      this.form.identifierCode = identifierCode;
+      this.lookupState.error = '';
+
+      if (!identifierCode) {
+        this.lookupState.error = 'Provide an identifier code before lookup.';
+        return;
+      }
+
+      await runAsyncState(this.lookupState, async () => {
+        const response = await lookupItemByIdentifier(store, identifierCode);
+        if (response.status !== 'ok') {
+          const message = this.lookupStatusMessage(response.status, identifierCode);
+          this.lookupState.error = message;
+          store.addAlert({
+            type: response.status === 'not_found' ? 'info' : 'warning',
+            message,
+          });
+          return;
+        }
+
+        if (!response.item || typeof response.item !== 'object') {
+          const message = 'Lookup returned no item payload to apply.';
+          this.lookupState.error = message;
+          store.addAlert({
+            type: 'warning',
+            message,
+          });
+          return;
+        }
+
+        const mapped = mapLookupItemToForm({
+          form: this.form,
+          lookupItem: response.item,
+          locations: this.locations,
+        });
+
+        if (!mapped.didUpdate) {
+          const message = 'Lookup finished, but no compatible fields were returned.';
+          this.lookupState.error = message;
+          store.addAlert({
+            type: 'info',
+            message,
+          });
+          return;
+        }
+
+        this.form = {
+          ...mapped.form,
+          itemId: '',
+          itemUuidB64: '',
+        };
+        if (mapped.locationSearch !== null) {
+          this.locationSearch = mapped.locationSearch;
+        }
+        this.syncStockTypeState(this.form.stockType);
+        this.syncStockTypeSelect();
+        this.syncStockLevelSelect();
+        this.syncLocationValidity();
+        this.upsertPreview = null;
+        this.previewState.error = '';
+        this.submitError = '';
+        if (this.previewUrl.startsWith('blob:')) {
+          URL.revokeObjectURL(this.previewUrl);
+        }
+        this.previewUrl = '';
+        this.suggestions = [];
+        this.persistDraft();
+
+        const sourceSuffix = response.source ? ` (${response.source})` : '';
+        const cacheSuffix = response.cacheHit ? ', cache hit' : '';
+        store.addAlert({
+          type: 'success',
+          message: `Lookup applied product details${sourceSuffix}${cacheSuffix}.`,
+        });
+      }).catch((error) => {
+        store.addAlert({
+          type: 'warning',
+          message: `Could not complete lookup: ${error.message || 'Unknown lookup error.'}`,
+        });
+      });
+    },
     async loadLocations() {
       if (!store.isConnected) {
         return;
@@ -1098,6 +1429,7 @@ export function labelCreatePageData(store) {
       }).catch(() => {});
     },
     reset(revokePreview = true) {
+      this.closeScanner();
       this.form = createDefaultForm();
       this.syncStockTypeState(this.form.stockType);
       this.suggestions = [];
@@ -1105,6 +1437,7 @@ export function labelCreatePageData(store) {
       this.locationPickerOpen = false;
       this.successMessage = '';
       this.submitError = '';
+      this.lookupState.error = '';
       this.fieldErrors = {};
       this.upsertPreview = null;
       this.printIssue = '';