import {
  adjustStockEntry,
  getStockEntry,
  lookupItemDetails,
  patchStockItem,
  useStockItem,
} from '../../api/stock.js';
import { BrowserMultiFormatReader } from '@zxing/browser';
import { formatPrintErrorMessage, printItemLabel } from '../../api/labels.js';
import { fetchLocations } from '../../api/locations.js';
import { getRouteContext } from '../../app/router.js';
import { createAsyncState, runAsyncState } from '../shared/ui-state.js';
import { formatDate } from '../shared/date-utils.js';

function todayAtMidnight() {
  const now = new Date();
  return new Date(now.getFullYear(), now.getMonth(), now.getDate());
}

function parseDateValue(value) {
  if (!value) {
    return null;
  }

  const [year, month, day] = String(value).split('-').map(Number);
  if (!year || !month || !day) {
    return null;
  }

  return new Date(year, month - 1, day);
}

function normalizeIdentifierCode(value) {
  return String(value || '').replace(/\s+/g, '').trim();
}

function expirationInfo(entry) {
  if (!entry?.expire_date) {
    return {
      key: 'none',
      label: 'No expiration date',
      detail: 'No expiration date',
    };
  }

  const expireDate = parseDateValue(entry.expire_date);
  const expireIn =
    typeof entry.expire_in === 'number'
      ? entry.expire_in
      : expireDate
        ? Math.round((expireDate - todayAtMidnight()) / (24 * 60 * 60 * 1000))
        : null;

  if (expireIn === null) {
    return {
      key: 'none',
      label: 'No expiration date',
      detail: 'No expiration date',
    };
  }

  if (expireIn < 0) {
    return {
      key: 'expired',
      label: 'Expired',
      detail: `Expired ${Math.abs(expireIn)} day${Math.abs(expireIn) === 1 ? '' : 's'} ago`,
    };
  }

  if (expireIn <= 2) {
    return {
      key: 'use-first',
      label: expireIn === 0 ? 'Use today' : 'Use first',
      detail: expireIn === 0 ? 'Expires today' : `Expires in ${expireIn} day${expireIn === 1 ? '' : 's'}`,
    };
  }

  if (expireIn <= 7) {
    return {
      key: 'upcoming',
      label: 'Upcoming expiration',
      detail: `Expires in ${expireIn} days`,
    };
  }

  return {
    key: 'within-date',
    label: 'Within date',
    detail: `Expires in ${expireIn} days`,
  };
}

export function renderStockDetailPage() {
  return `
    <section class="container-xxl py-4 py-lg-5" x-data="stockDetailPage()" x-init="init()">
      <div class="d-flex flex-column flex-lg-row justify-content-between gap-3 align-items-lg-center mb-4">
        <div>
          <a href="#/stock" class="link-secondary text-decoration-none small">&larr; Back to stock</a>
          <h1 class="h3 mb-1 mt-2">Stock detail</h1>
          <p class="text-body-secondary mb-0">Inspect the entry and update its quantity without leaving the workflow.</p>
        </div>
      </div>

      <template x-if="state.error">
        <div class="alert alert-danger" x-text="state.error"></div>
      </template>

      <template x-if="entry">
        <div class="row g-4">
          <div class="col-12 col-lg-7">
            <div class="card border-0 shadow-sm">
              <div class="card-body p-4">
                <div class="d-flex flex-wrap justify-content-between gap-3 mb-4">
                  <div>
                    <p class="eyebrow mb-2">Entry</p>
                    <h2 class="h4 mb-1" x-text="entry.name"></h2>
                    <p class="text-body-secondary mb-0" x-text="entry.description || 'No description'"></p>
                  </div>
                  <span class="badge rounded-pill text-bg-light border align-self-start" x-text="entry.status || 'ok'"></span>
                </div>

                <dl class="row mb-0 detail-grid">
                  <dt class="col-5">Kitchen</dt>
                  <dd class="col-7" x-text="$store.app.activeKitchen?.name || 'Unknown'"></dd>
                  <dt class="col-5">Quantity</dt>
                  <dd class="col-7" x-text="formatQuantity(entry)"></dd>
                  <dt class="col-5">Location</dt>
                  <dd class="col-7" x-text="locationLabel(entry)"></dd>
                  <dt class="col-5">Production date</dt>
                  <dd class="col-7" x-text="formatDate(entry.date)"></dd>
                  <dt class="col-5">Expiration date</dt>
                  <dd class="col-7" x-text="formatDate(entry.expire_date)"></dd>
                  <dt class="col-5">Expiration status</dt>
                  <dd class="col-7">
                    <div class="d-flex align-items-center gap-2 mb-1">
                      <span class="badge rounded-pill" :class="expirationBadgeClass(entry)" x-text="expirationFor(entry).label"></span>
                    </div>
                    <div class="small text-body-secondary" x-text="expirationFor(entry).detail"></div>
                  </dd>
                  <dt class="col-5">Stock type</dt>
                  <dd class="col-7" x-text="entry.stock_type || 'Stored'"></dd>
                </dl>

                <div class="mt-4">
                  <h3 class="h6 mb-3">Identifier</h3>
                  <div class="input-group">
                    <input
                      class="form-control"
                      type="text"
                      x-model="identifierDraft"
                      @input="identifierState.error = ''"
                      inputmode="numeric"
                      autocomplete="off"
                      placeholder="EAN / UPC / GTIN"
                    />
                    <button
                      class="btn btn-outline-primary"
                      type="button"
                      @click="saveIdentifierCode()"
                      :disabled="identifierState.isLoading"
                    >
                      <span x-show="!identifierState.isLoading">Save identifier</span>
                      <span x-show="identifierState.isLoading">Saving...</span>
                    </button>
                    <button
                      class="btn btn-outline-secondary"
                      type="button"
                      @click="openScanner()"
                      x-show="scannerState.hasCamera"
                    >
                      Camera
                    </button>
                  </div>
                  <div class="form-text">Used for product identifier tracking and metadata lookups.</div>
                  <template x-if="identifierState.error">
                    <div class="small text-danger mt-1" x-text="identifierState.error"></div>
                  </template>
                </div>

                <div class="mt-4">
                  <h3 class="h6 mb-2">OpenFoodFacts</h3>
                  <div class="d-flex flex-wrap gap-2">
                    <button
                      class="btn btn-outline-secondary"
                      type="button"
                      @click="runItemLookup(false)"
                      :disabled="lookupDetailsState.isLoading || !hasIdentifierCode()"
                    >
                      <span x-show="!lookupDetailsState.isLoading">Refresh details</span>
                      <span x-show="lookupDetailsState.isLoading">Refreshing...</span>
                    </button>
                    <button
                      class="btn btn-outline-primary"
                      type="button"
                      @click="runItemLookup(true)"
                      :disabled="lookupDetailsState.isLoading || !hasIdentifierCode()"
                    >
                      <span x-show="!lookupDetailsState.isLoading">Apply missing fields</span>
                      <span x-show="lookupDetailsState.isLoading">Applying...</span>
                    </button>
                  </div>
                  <template x-if="!hasIdentifierCode()">
                    <div class="small text-body-secondary mt-2">Save an identifier code first to enable lookup refresh.</div>
                  </template>
                  <template x-if="offLookupFeedback.message">
                    <div
                      class="alert mt-3 mb-0"
                      :class="offLookupFeedback.type === 'success' ? 'alert-success' : 'alert-warning'"
                      x-text="offLookupFeedback.message"
                    ></div>
                  </template>
                </div>
                <div class="mt-4">
                  <h3 class="h6 mb-3">Nutrition</h3>
                  <dl class="row mb-0 detail-grid">
                    <dt class="col-5">Nutri-Score</dt>
                    <dd class="col-7" x-text="nutriScoreLabel(entry)"></dd>
                    <dt class="col-5">Nutriments</dt>
                    <dd class="col-7">
                      <template x-if="nutritionFactsRows(entry).length">
                        <ul class="list-unstyled mb-0 small d-grid gap-1">
                          <template x-for="fact in nutritionFactsRows(entry)" :key="fact.key">
                            <li>
                              <span class="text-body-secondary" x-text="fact.label + ':'"></span>
                              <span class="fw-semibold" x-text="fact.value"></span>
                            </li>
                          </template>
                        </ul>
                      </template>
                      <template x-if="!nutritionFactsRows(entry).length">
                        <span class="text-body-secondary">Not available</span>
                      </template>
                    </dd>
                  </dl>
                </div>
              </div>
            </div>
          </div>

          <div class="col-12 col-lg-5">
            <div class="card border-0 shadow-sm">
              <div class="card-body p-4">
                <p class="eyebrow mb-2">Adjustment</p>
                <h2 class="h5 mb-3">Update current stock level</h2>

                <template x-if="entry.stock_type === 'measured'">
                  <form class="vstack gap-3" @submit.prevent="submitMeasuredAdjustment()">
                    <div>
                      <label class="form-label">Adjustment mode</label>
                      <select class="form-select" x-model="adjustment.mode">
                        <option value="increment">Add quantity</option>
                        <option value="decrement">Subtract quantity</option>
                        <option value="set">Set exact quantity</option>
                      </select>
                    </div>
                    <div>
                      <label class="form-label">Quantity</label>
                      <input class="form-control" type="number" min="0" step="0.01" x-model="adjustment.quantity" required />
                    </div>
                    <div class="d-flex flex-wrap gap-2">
                      <button type="button" class="btn btn-outline-secondary" @click="quickAdjust(1)">+1</button>
                      <button type="button" class="btn btn-outline-secondary" @click="quickAdjust(-1)">-1</button>
                      <button type="button" class="btn btn-outline-secondary" @click="quickAdjust(0.5)">+0.5</button>
                    </div>

                    <template x-if="adjustmentState.error">
                      <div class="alert alert-danger mb-0" x-text="adjustmentState.error"></div>
                    </template>
                    <template x-if="printFeedback.message">
                      <div
                        class="alert mb-0"
                        :class="printFeedback.type === 'success' ? 'alert-success' : 'alert-warning'"
                        x-text="printFeedback.message"
                      ></div>
                    </template>

                    <div class="d-flex flex-wrap gap-2">
                      <button class="btn btn-primary" type="submit" :disabled="adjustmentState.isLoading">
                        <span x-show="!adjustmentState.isLoading">Save quantity</span>
                        <span x-show="adjustmentState.isLoading">Saving...</span>
                      </button>
                      <button class="btn btn-outline-secondary" type="button" @click="printLabel()" :disabled="printState.isLoading">
                        <span x-show="!printState.isLoading">Print label</span>
                        <span x-show="printState.isLoading">Printing...</span>
                      </button>
                      <button class="btn btn-outline-danger" type="button" @click="markGone()" :disabled="adjustmentState.isLoading">
                        <span x-show="!adjustmentState.isLoading">Mark gone</span>
                        <span x-show="adjustmentState.isLoading">Removing...</span>
                      </button>
                    </div>
                  </form>
                </template>

                <template x-if="entry.stock_type === 'descriptive'">
                  <form class="vstack gap-3" @submit.prevent="submitLevelAdjustment()">
                    <div>
                      <label class="form-label">Stock level</label>
                      <select class="form-select" x-model="adjustment.level">
                        <option value="plenty">Plenty</option>
                        <option value="good">Good</option>
                        <option value="some">Some</option>
                        <option value="low">Low</option>
                        <option value="trace">Trace</option>
                        <option value="gone">Gone</option>
                      </select>
                    </div>

                    <template x-if="adjustmentState.error">
                      <div class="alert alert-danger mb-0" x-text="adjustmentState.error"></div>
                    </template>
                    <template x-if="printFeedback.message">
                      <div
                        class="alert mb-0"
                        :class="printFeedback.type === 'success' ? 'alert-success' : 'alert-warning'"
                        x-text="printFeedback.message"
                      ></div>
                    </template>

                    <div class="d-flex flex-wrap gap-2">
                      <button class="btn btn-primary" type="submit" :disabled="adjustmentState.isLoading">
                        <span x-show="!adjustmentState.isLoading">Save stock level</span>
                        <span x-show="adjustmentState.isLoading">Saving...</span>
                      </button>
                      <button class="btn btn-outline-secondary" type="button" @click="printLabel()" :disabled="printState.isLoading">
                        <span x-show="!printState.isLoading">Print label</span>
                        <span x-show="printState.isLoading">Printing...</span>
                      </button>
                      <button class="btn btn-outline-danger" type="button" @click="markGone()" :disabled="adjustmentState.isLoading">
                        <span x-show="!adjustmentState.isLoading">Mark gone</span>
                        <span x-show="adjustmentState.isLoading">Removing...</span>
                      </button>
                    </div>
                  </form>
                </template>

                <template x-if="entry.stock_type === 'binary'">
                  <div class="vstack gap-3">
                    <p class="text-body-secondary mb-0">
                      Binary stock items can be marked gone from this screen.
                    </p>

                    <template x-if="adjustmentState.error">
                      <div class="alert alert-danger mb-0" x-text="adjustmentState.error"></div>
                    </template>
                    <template x-if="printFeedback.message">
                      <div
                        class="alert mb-0"
                        :class="printFeedback.type === 'success' ? 'alert-success' : 'alert-warning'"
                        x-text="printFeedback.message"
                      ></div>
                    </template>

                    <button class="btn btn-outline-danger align-self-start" type="button" @click="markGone()" :disabled="adjustmentState.isLoading">
                      <span x-show="!adjustmentState.isLoading">Mark gone</span>
                      <span x-show="adjustmentState.isLoading">Removing...</span>
                    </button>
                    <button class="btn btn-outline-secondary align-self-start" type="button" @click="printLabel()" :disabled="printState.isLoading">
                      <span x-show="!printState.isLoading">Print label</span>
                      <span x-show="printState.isLoading">Printing...</span>
                    </button>
                  </div>
                </template>
              </div>
            </div>
          </div>
        </div>
      </template>

      <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>
  `;
}

export function stockDetailPageData(store) {
  return {
    state: createAsyncState(),
    adjustmentState: createAsyncState(),
    printState: createAsyncState(),
    identifierState: createAsyncState(),
    scannerReader: null,
    scannerControls: null,
    scannerState: {
      isOpen: false,
      isLoading: false,
      hasCamera: false,
      error: '',
      lastDetectedCode: '',
    },
    lookupDetailsState: createAsyncState(),
    printFeedback: {
      type: '',
      message: '',
    },
    offLookupFeedback: {
      type: '',
      message: '',
    },
    entry: null,
    locationPathByUuid: {},
    identifierDraft: '',
    adjustment: {
      mode: 'increment',
      quantity: '1',
      level: 'plenty',
    },
    async init() {
      this.scannerState.hasCamera = this.canUseCameraScanner();
      if (!store.isConnected) {
        return;
      }

      const { params } = getRouteContext();
      await runAsyncState(this.state, async () => {
        const [entry, locations] = await Promise.all([
          getStockEntry(store, params.id),
          fetchLocations(store).catch(() => ({ flat: [] })),
        ]);
        this.entry = entry;
        this.identifierDraft = normalizeIdentifierCode(entry?.identifier_code);
        this.locationPathByUuid = Object.fromEntries(
          (locations.flat || [])
            .filter((location) => location.uuid_b64)
            .map((location) => [location.uuid_b64, location.pathLabel || location.name]),
        );
        this.adjustment.level = this.entry?.level || 'plenty';
      }).catch(() => {});
    },
    destroy() {
      this.stopScanner();
    },
    canUseCameraScanner() {
      return Boolean(
        typeof navigator !== 'undefined'
        && navigator.mediaDevices
        && typeof navigator.mediaDevices.getUserMedia === 'function',
      );
    },
    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;
      const shouldLogDecodeErrors = import.meta.env.DEV;
      let lastDecodeErrorName = '';
      let lastDecodeErrorAt = 0;

      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) {
              // Continuous decode emits expected per-frame misses/errors before a valid barcode is found.
              // Keep the modal quiet and only surface startup failures from the outer catch block.
              if (shouldLogDecodeErrors) {
                const errorName = String(error?.name || 'UnknownError');
                const now = Date.now();
                if (errorName !== lastDecodeErrorName || now - lastDecodeErrorAt > 2000) {
                  console.debug('[scanner] Ignoring frame decode error while scanning:', errorName, error?.message || '');
                  lastDecodeErrorName = errorName;
                  lastDecodeErrorAt = now;
                }
              }
              return;
            }
          },
        );
      } 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 = normalizeIdentifierCode(rawCode);
      if (!code || !this.scannerState.isOpen) {
        return;
      }

      this.identifierDraft = code;
      this.scannerState.lastDetectedCode = code;
      this.closeScanner();
      store.addAlert({
        type: 'success',
        message: `Scanned identifier code: ${code}`,
      });
    },
    async saveIdentifierCode() {
      if (!this.entry?.uuid_b64) {
        return;
      }

      this.identifierState.error = '';
      await runAsyncState(this.identifierState, async () => {
        const identifierCode = normalizeIdentifierCode(this.identifierDraft);
        const updated = await patchStockItem(store, this.entry.uuid_b64, {
          identifier_code: identifierCode || null,
        });

        this.entry = updated;
        this.identifierDraft = normalizeIdentifierCode(updated?.identifier_code || identifierCode);
        store.addAlert({
          type: 'success',
          message: identifierCode
            ? `Identifier code saved for ${this.entry.name}.`
            : `Identifier code cleared for ${this.entry.name}.`,
        });
      }).catch(() => {});
    },

    normalizedIdentifierDraft() {
      return normalizeIdentifierCode(this.identifierDraft);
    },
    hasIdentifierCode() {
      return Boolean(this.normalizedIdentifierDraft());
    },
    async reloadEntry(uuidB64) {
      const refreshed = await getStockEntry(store, uuidB64);
      this.entry = refreshed;
      this.identifierDraft = normalizeIdentifierCode(refreshed?.identifier_code);
      this.adjustment.level = this.entry?.level || 'plenty';
    },
    itemLookupStatusMessage(response) {
      const retryAfter = Number.isInteger(response?.retryAfterSeconds) && response.retryAfterSeconds > 0
        ? ` Retry in ${response.retryAfterSeconds}s.`
        : '';

      if (response?.status === 'missing_identifier') {
        return 'Save an identifier code before running lookup.';
      }
      if (response?.status === 'not_found') {
        return `No OpenFoodFacts result found for code ${this.normalizedIdentifierDraft() || 'unknown'}.`;
      }
      if (response?.status === 'rate_limited') {
        return `OpenFoodFacts lookup is temporarily rate-limited.${retryAfter}`;
      }
      if (response?.status === 'lookup_failed') {
        return 'OpenFoodFacts lookup failed. Try again shortly or continue manually.';
      }

      return 'Lookup response could not be applied.';
    },
    itemLookupSuccessMessage(response) {
      const parts = [
        response?.update
          ? 'Applied missing fields from OpenFoodFacts.'
          : 'Fetched OpenFoodFacts details preview.',
      ];
      const source = response?.item?.external_source || this.entry?.external_source;

      if (source) {
        parts.push(`Source: ${source}.`);
      }

      if (Array.isArray(response?.updatedFields) && response.updatedFields.length) {
        parts.push(`Updated: ${response.updatedFields.join(', ')}.`);
      }

      if (response?.staleCache) {
        parts.push('Using stale cache data.');
      } else {
        parts.push('Cache freshness: current.');
      }

      if (response?.offPayloadFetchedAt) {
        const fetchedAt = new Date(response.offPayloadFetchedAt);
        parts.push(
          `Fetched at: ${
            Number.isNaN(fetchedAt.getTime())
              ? response.offPayloadFetchedAt
              : fetchedAt.toLocaleString()
          }.`,
        );
      }

      return parts.join(' ');
    },
    async runItemLookup(update) {
      if (!this.entry?.uuid_b64) {
        return;
      }

      const identifierCode = this.normalizedIdentifierDraft();
      if (!identifierCode) {
        this.offLookupFeedback = {
          type: 'warning',
          message: 'Save an identifier code before running lookup refresh.',
        };
        return;
      }

      this.lookupDetailsState.error = '';
      await runAsyncState(this.lookupDetailsState, async () => {
        const response = await lookupItemDetails(store, this.entry.uuid_b64, { update });
        if (response.status !== 'ok') {
          const message = this.itemLookupStatusMessage(response);
          this.offLookupFeedback = {
            type: 'warning',
            message,
          };
          store.addAlert({ type: 'warning', message });
          return;
        }

        if (update) {
          await this.reloadEntry(this.entry.uuid_b64);
        } else if (response.item) {
          this.entry = response.item;
          this.identifierDraft = normalizeIdentifierCode(response.item.identifier_code || identifierCode);
        }

        const message = this.itemLookupSuccessMessage(response);
        this.offLookupFeedback = {
          type: 'success',
          message,
        };
        store.addAlert({
          type: 'success',
          message,
        });
      }).catch((error) => {
        this.offLookupFeedback = {
          type: 'warning',
          message: error?.message || 'OpenFoodFacts lookup failed.',
        };
      });
    },
    async submitMeasuredAdjustment() {
      if (!this.entry) {
        return;
      }

      await runAsyncState(this.adjustmentState, async () => {
        const requestedQuantity = Number(this.adjustment.quantity);
        if (Number.isNaN(requestedQuantity) || requestedQuantity < 0) {
          throw new Error('Enter a valid quantity first.');
        }

        const currentQuantity = Number(this.entry.quantity || 0);
        const exactQuantity =
          this.adjustment.mode === 'increment'
            ? currentQuantity + requestedQuantity
            : this.adjustment.mode === 'decrement'
              ? Math.max(currentQuantity - requestedQuantity, 0)
              : requestedQuantity;

        this.entry = await adjustStockEntry(store, this.entry.uuid_b64, {
          quantity: exactQuantity,
        });
        this.identifierDraft = normalizeIdentifierCode(this.entry?.identifier_code);
        store.addAlert({ type: 'success', message: 'Stock quantity updated.' });
      }).catch(() => {});
    },
    async submitLevelAdjustment() {
      if (!this.entry) {
        return;
      }

      await runAsyncState(this.adjustmentState, async () => {
        if (this.adjustment.level === 'gone') {
          const entryName = this.entry.name;
          await useStockItem(store, this.entry.uuid_b64);
          store.addAlert({ type: 'success', message: `${entryName} was marked gone.` });
          window.__loncApp.navigate('/stock');
          return;
        }

        this.entry = await adjustStockEntry(store, this.entry.uuid_b64, {
          level: this.adjustment.level,
        });
        this.identifierDraft = normalizeIdentifierCode(this.entry?.identifier_code);
        store.addAlert({ type: 'success', message: 'Stock level updated.' });
      }).catch(() => {});
    },
    async markGone() {
      if (!this.entry) {
        return;
      }

      await runAsyncState(this.adjustmentState, async () => {
        const result = await useStockItem(store, this.entry.uuid_b64);
        const alreadyGone = result.status === 'already_gone';
        store.addAlert({
          type: alreadyGone ? 'info' : 'success',
          message: alreadyGone
            ? `${this.entry.name} was already out of stock.`
            : `${this.entry.name} was marked gone.`,
        });
        window.__loncApp.navigate('/stock');
      }).catch(() => {});
    },
    async printLabel() {
      if (!this.entry?.uuid_b64) {
        return;
      }

      this.printFeedback = {
        type: '',
        message: '',
      };

      await runAsyncState(this.printState, async () => {
        try {
          await printItemLabel(store, this.entry.uuid_b64);
          this.printFeedback = {
            type: 'success',
            message: 'Label printed successfully.',
          };
          store.addAlert({
            type: 'success',
            message: `${this.entry.name} label sent to printer.`,
          });
        } catch (error) {
          const parsed = formatPrintErrorMessage(error);
          this.printFeedback = {
            type: 'warning',
            message: parsed,
          };
          store.addAlert({
            type: 'warning',
            message: `Could not print ${this.entry.name} label: ${parsed}`,
          });
        }
      }).catch(() => {});
    },
    quickAdjust(step) {
      const current = Number(this.adjustment.quantity || 0);
      this.adjustment.quantity = String(Math.max(current + step, 0));
    },
    formatDate,
    expirationFor(entry) {
      return expirationInfo(entry);
    },
    expirationBadgeClass(entry) {
      const key = this.expirationFor(entry).key;
      if (key === 'expired') {
        return 'text-bg-danger';
      }
      if (key === 'use-first') {
        return 'text-bg-warning';
      }
      if (key === 'upcoming') {
        return 'text-bg-secondary';
      }
      if (key === 'within-date') {
        return 'text-bg-success';
      }
      return 'text-bg-light border';
    },
    locationLabel(entry) {
      const locationUuid = entry?.location_initial_uuid_b64;
      if (!locationUuid) {
        return 'Unassigned';
      }

      return this.locationPathByUuid[locationUuid] || 'Location not resolved';
    },
    nutriScoreLabel(entry) {
      const value = entry?.nutriscore_grade;
      if (!value) {
        return 'Not available';
      }

      return String(value).toUpperCase();
    },
    nutritionFactsRows(entry) {
      const facts = entry?.nutrition_facts;
      if (!facts || typeof facts !== 'object' || Array.isArray(facts)) {
        return [];
      }

      const preferredOrder = [
        'per',
        'serving_size',
        'energy_kj',
        'energy_kcal',
        'fat',
        'saturated_fat',
        'carbohydrates',
        'sugars',
        'fibers',
        'proteins',
        'salt',
        'sodium',
      ];
      const rankByKey = new Map(preferredOrder.map((key, index) => [key, index]));

      return Object.entries(facts)
        .sort(([leftKey], [rightKey]) => {
          const leftRank = rankByKey.has(leftKey) ? rankByKey.get(leftKey) : Number.POSITIVE_INFINITY;
          const rightRank = rankByKey.has(rightKey) ? rankByKey.get(rightKey) : Number.POSITIVE_INFINITY;

          if (leftRank !== rightRank) {
            return leftRank - rightRank;
          }

          return leftKey.localeCompare(rightKey);
        })
        .map(([key, value]) => ({
          key,
          label: this.nutritionLabel(key),
          value: this.formatNutritionValue(value),
        }));
    },
    nutritionLabel(key) {
      const labels = {
        per: 'Per',
        serving_size: 'Serving size',
        energy_kj: 'Energy (kJ)',
        energy_kcal: 'Energy (kcal)',
        fat: 'Fat',
        saturated_fat: 'Saturated fat',
        carbohydrates: 'Carbohydrates',
        sugars: 'Sugars',
        fibers: 'Fibers',
        proteins: 'Proteins',
        salt: 'Salt',
        sodium: 'Sodium',
      };

      return labels[key] || key.replace(/_/g, ' ');
    },
    formatNutritionValue(value) {
      if (value === null || value === undefined || value === '') {
        return 'n/a';
      }

      return String(value);
    },
    formatQuantity(entry) {
      return `${entry.quantity ?? 0} ${entry.uom_symbol || ''}`.trim();
    },
  };
}