import PocketBase from 'pocketbase';
import {
  AppSettings,
  DEFAULT_SETTINGS,
  OrderItem,
  OrderItemAttachment,
  AttachmentSource,
  DriverLocation,
  StockPurchaseItem,
  PurchaseOrder,
} from './types';
import { clearCache as clearItemsCache } from './itemsCache';

const POCKETBASE_URL = process.env.NEXT_PUBLIC_POCKETBASE_URL || 'https://pocketbase-gnqc88suy8fqk6wyryjjdpvl.169.239.180.130.sslip.io';

export const pb = new PocketBase(POCKETBASE_URL);

// Disable auto-cancellation so React re-renders don't kill in-flight requests
pb.autoCancellation(false);

// Auth helpers
export const isAuthenticated = () => pb.authStore.isValid;

export const getCurrentUser = () => pb.authStore.model;

export const logout = () => {
  pb.authStore.clear();
  // Drop cached items so the next driver who logs in on this
  // device doesn't briefly see the previous driver's list.
  clearItemsCache();
  if (typeof window !== 'undefined') {
    window.location.href = '/login/';
  }
};

export const login = async (email: string, password: string) => {
  return await pb.collection('users').authWithPassword(email, password);
};

// PB `order_items` schema (verified live 2026-08-11):
//   drv_id           = relation -> users (canonical "assigned driver" field)
//   driver           = NOT IN PB — confirmed via schema probe. The
//                     operator (WFDash) app filters on this and gets
//                     400s silently. Must be updated to use drv_id.
//   supplier         = relation -> suppliers (singular)
//   item_status real values: assigned, collection_pool, pending,
//                           collected, problem, invoiced, ... (driver_pool
//                           is NOT in the schema either — operator app
//                           references it in its filters and gets 400s.)
//   drv_status real values: assigned, en_route, collected, failed, '' (empty),
//                           unassigned
//   po_description   = supplier-facing line ("M20×40 nut sku 11243…")
//   description      = customer-facing line
//   order_qty        = supplier-facing qty (falls back to quantity)
//   quantity         = customer-facing qty
//   assigned_at      = ISO timestamp, populated server-side on assignment
//   problem_notes    = driver-written audit trail of failed collections
//
// Assigned-tab query:
//   The driver app's getMyAssignedItems filters on the canonical
//   drv_id + item_status="assigned" pair. Live PB probe (2026-08-11)
//   confirms drv_id is set on 66 rows; only 3 currently sit in
//   item_status="assigned". The remaining 63 have moved on in workflow
//   (e.g. invoiced). Items the operator app "assigns" never surface
//   here because the operator's filter on the non-existent `driver`
//   field 400s, and its `driver_pool` alias for item_status also 400s.
//   Operator-side fix required: write `drv_id` and
//   `item_status = "assigned"`.
//
// Unknown fields/statuses are NOT rejected by PB filter parser as
// soft failures — they hard-400 the whole query. Always use the exact
// field + status strings below.

// ---------- Hydration helper ----------
// PB query builder can't always do the supplier expand (some deployments
// strip expand support). This helper takes raw records and, if supplier
// isn't already expanded, batch-fetches suppliers by id and stitches
// them back into item.expand.supplier. Shared by every fetch below.
const hydrateSuppliers = async (items: OrderItem[]): Promise<OrderItem[]> => {
  const missing = Array.from(new Set(
    items
      .filter((it) => !it.expand?.supplier && (it as any).supplier)
      .map((it) => (it as any).supplier as string)
  ));
  if (missing.length === 0) return items;

  let supplierMap = new Map<string, any>();
  try {
    const filter = missing.map((id) => `id = "${id}"`).join(' || ');
    const suppliers = await pb.collection('suppliers').getFullList({ filter });
    supplierMap = new Map(suppliers.map((s: any) => [s.id, s]));
  } catch {
    return items;
  }

  return items.map((it) => {
    if (it.expand?.supplier) return it;
    const supplierId = (it as any).supplier;
    const supplier = supplierId ? supplierMap.get(supplierId) : null;
    if (!supplier) return it;
    return {
      ...it,
      expand: { ...(it.expand || {}), supplier },
    } as OrderItem;
  });
};

// ---------- 1. ASSIGNED — only items with drv_id = current user ----------
// Live PB schema probe (2026-08-11) confirmed:
//   - drv_id is the canonical driver-assignment relation (66 rows set).
//   - `driver` and `item_status = "driver_pool"` are NOT in the schema.
//     Referencing either in a filter hard-400s the whole query, so any
//     OR-fallback against them would *break* the Assigned tab rather
//     than rescue it.
//   - item_status = "assigned" is the live, working status.
//   - `assigned_at` is set by the operator app to the SCHEDULED pickup
//     date (not the moment of assignment). Items assigned "today for
//     tomorrow" carry assigned_at = tomorrow's date — the driver app
//     surfaces them tomorrow, not today. Live probe shows current
//     assigned rows split evenly across Aug 18/19/20 as expected.
//
// Assigned-day window:
//   The driver app shows items whose `assigned_at` falls within a
//   rolling 2-day window: yesterday + today (driver-local time). This
//   covers:
//     - items scheduled for today (the day's work), and
//     - items scheduled for yesterday (carryover that wasn't completed
//       — still actionable today).
//   Items scheduled for tomorrow or later stay hidden until their day
//   arrives, so the driver isn't tempted to "get ahead" of the schedule
//   and pickup a PO whose supplier hasn't been told it'll be picked up.
//
// Timezone: the window boundaries are computed in the driver's local
// timezone (this is a browser app, so `new Date()` is local) and then
// converted to UTC ISO strings for the PB filter. This works as long
// as the driver and operator share a timezone — if they diverge, the
// window rolls over at midnight in the driver's locale, not the
// operator's. Acceptable for the current single-region deployment.
const getAssignedDayWindow = (): { fromIso: string; toIso: string } => {
  const now = new Date();
  // Today at 00:00 in the driver's local timezone.
  const todayStart = new Date(now.getFullYear(), now.getMonth(), now.getDate());
  // Last millisecond of today (23:59:59.999) — inclusive upper bound.
  const todayEnd = new Date(todayStart.getTime() + 24 * 60 * 60 * 1000 - 1);
  // Yesterday at 00:00 — inclusive lower bound.
  const yesterdayStart = new Date(todayStart.getTime() - 24 * 60 * 60 * 1000);
  return {
    fromIso: yesterdayStart.toISOString(),
    toIso: todayEnd.toISOString(),
  };
};

export const getMyAssignedItems = async (): Promise<OrderItem[]> => {
  const user = getCurrentUser();
  if (!user) return [];
  const { fromIso, toIso } = getAssignedDayWindow();
  const filter =
    `drv_id = "${user.id}" && item_status = "assigned" && ` +
    `assigned_at >= "${fromIso}" && assigned_at <= "${toIso}"`;
  try {
    const items = await pb.collection('order_items').getFullList<OrderItem>({
      filter,
      expand: 'supplier,order,purchase_order',
      sort: 'supplier.suppliername',
    });
    return items;
  } catch {
    const items = await pb.collection('order_items').getFullList<OrderItem>({
      filter,
    });
    return hydrateSuppliers(items);
  }
};

// Backwards-compat alias — keep old call sites working during the refactor.
export const getAssignedCollections = getMyAssignedItems;

// ---------- 1b. STOCK PICKUPS — assigned stock_purchase_items ----------
// Stock pickups live in their own PB collection (`stock_purchase_items`,
// not `order_items`) with their own status enum. The driver app
// previously only queried `order_items`, so a driver with a stock
// pickup assigned to them (status="assigned_to_driver") saw nothing —
// the row never made it into the Assigned list.
//
// Live PB probe (2026-08-17):
//   - drv_id on stock_purchase_items is a relation -> users (works)
//   - status values present: 'booked' | 'collection_pool' |
//     'assigned_to_driver' | 'collected' | ''  (no 'assigned' alias
//     on this collection — the operator-side 'assigned' is on
//     order_items only).
//   - purchase -> purchases; purchases -> suppliers via the standard
//     supplier relation, so `expand: 'purchase.supplier,stock_item'`
//     brings in both supplier coords and the stock_item name/sku.
//
// The merge step below tags every returned row with kind:"pickup"
// and re-shapes it onto the OrderItem shape so the existing card /
// modal / map components render stock pickups without modification.
// Only the WRITE side (handleCollect / handleProblem in app/page.tsx)
// branches on kind — it has to PATCH `stock_purchase_items` instead
// of `order_items`.
export const getMyAssignedStockItems = async (): Promise<OrderItem[]> => {
  const user = getCurrentUser();
  if (!user) return [];
  let rows: StockPurchaseItem[] = [];
  try {
    rows = await pb.collection('stock_purchase_items').getFullList<StockPurchaseItem>({
      filter: `drv_id = "${user.id}" && status = "assigned_to_driver"`,
      expand: 'purchase.supplier,stock_item',
      sort: 'purchase.purchase_number',
    });
  } catch (e) {
    // Fallback without expand — re-fetch each purchase + stock_item
    // individually. Slower, but at least it doesn't 400 the whole tab.
    console.warn('[getMyAssignedStockItems] expand failed, falling back:', e instanceof Error ? e.message : e);
    try {
      rows = await pb.collection('stock_purchase_items').getFullList<StockPurchaseItem>({
        filter: `drv_id = "${user.id}" && status = "assigned_to_driver"`,
      });
      await hydrateStockExpansions(rows);
    } catch {
      return [];
    }
  }

  return rows.map(toOrderItemFromStock);
};

// Re-fetch the purchase + stock_item rows for any stock_purchase_items
// row where the expand side was dropped (degraded mode).
const hydrateStockExpansions = async (rows: StockPurchaseItem[]): Promise<void> => {
  const purchaseIds = new Set<string>();
  const stockItemIds = new Set<string>();
  for (const r of rows) {
    if (r.purchase) purchaseIds.add(r.purchase);
    if (r.stock_item) stockItemIds.add(r.stock_item);
  }
  if (purchaseIds.size === 0 && stockItemIds.size === 0) return;

  let purchaseMap = new Map<string, any>();
  let stockItemMap = new Map<string, any>();
  let supplierMap = new Map<string, any>();

  try {
    if (purchaseIds.size > 0) {
      const purchases = await pb.collection('purchases').getFullList({
        filter: Array.from(purchaseIds).map((id) => `id = "${id}"`).join(' || '),
        expand: 'supplier',
      });
      purchaseMap = new Map(purchases.map((p: any) => [p.id, p]));
      for (const p of purchases) {
        if ((p as any).expand?.supplier) {
          supplierMap.set((p as any).expand.supplier.id, (p as any).expand.supplier);
        } else if (p.supplier) {
          try {
            const sup = await pb.collection('suppliers').getOne(p.supplier);
            supplierMap.set(sup.id, sup);
          } catch { /* supplier missing — leave it empty */ }
        }
      }
    }
  } catch (e) {
    console.warn('[hydrateStockExpansions] purchases fetch failed:', e instanceof Error ? e.message : e);
  }
  try {
    if (stockItemIds.size > 0) {
      const stockItems = await pb.collection('stock_items').getFullList({
        filter: Array.from(stockItemIds).map((id) => `id = "${id}"`).join(' || '),
      });
      stockItemMap = new Map(stockItems.map((s: any) => [s.id, s]));
    }
  } catch (e) {
    console.warn('[hydrateStockExpansions] stock_items fetch failed:', e instanceof Error ? e.message : e);
  }

  for (const r of rows) {
    if (r.expand) continue;
    const purchase = purchaseMap.get(r.purchase);
    const supplier = purchase ? supplierMap.get(purchase.supplier) : undefined;
    const stockItem = stockItemMap.get(r.stock_item);
    r.expand = {
      purchase: purchase || undefined,
      stock_item: stockItem || undefined,
    };
    if (purchase && supplier) {
      (purchase as any).expand = { ...((purchase as any).expand || {}), supplier };
    }
  }
};

// Reshape a stock_purchase_items row onto the OrderItem shape so
// the existing card / modal / map components can render stock pickups
// without modification. The `kind: 'pickup'` tag is the only signal
// downstream code (write handlers in app/page.tsx) uses to decide
// which PB collection to PATCH.
//
// Field mapping (verified against the live schema 2026-08-17):
//   description      <- stock.description (falls back to stock_item.name)
//   po_description   <- stock.description (same — stock pickups don't
//                       have a separate customer-facing line)
//   quantity         <- stock.quantity (expected)
//   order_qty        <- stock.quantity (mirrors quantity so existing
//                       getItemDisplayQty helpers work)
//   item_status      <- 'assigned' (we map stock status onto the
//                       operator-side enum so chip counts and
//                       problem filters keep working)
//   drv_id           <- stock.drv_id
//   assigned_at      <- stock.assigned_at
//   notes            <- stock.notes
//   problem_*        <- pass-through
//   is_stock_item    <- true (renders the existing "Stock" badge)
//   expand.supplier  <- purchase.expand.supplier (so the supplier
//                       grouping on the list page works)
//   expand.purchase_order <- a synthesized { po_number, status,
//                       expand:{supplier} } from purchase so the PO
//                       tooltip / ItemDetailModal / PO sub-group
//                       bucket code keeps working
//   expand.stock_item <- pass-through (lets the detail modal show the
//                       canonical stock-item name + sku if needed)
//   qty_collected    <- stock.quantity_received (audit; the modal
//                       pre-fills this when re-opening)
const toOrderItemFromStock = (stock: StockPurchaseItem): OrderItem => {
  const purchase = stock.expand?.purchase as (PurchaseOrder & { expand?: { supplier?: any }; supplier?: string; purchase_number?: string }) | undefined;
  const supplierFromPurchase = purchase?.expand?.supplier;
  const stockItem = stock.expand?.stock_item;

  const description = (stock.description || stockItem?.description || stockItem?.name || '').trim();

  // Synthesize a purchase_order-shaped object from the purchase row.
  // We do this rather than aliasing so existing components that read
  // `expand.purchase_order.po_number` keep working unchanged.
  const purchase_order: PurchaseOrder | undefined = purchase
    ? ({
        id: purchase.id,
        po_number: purchase.purchase_number || '',
        status: purchase.status,
        expand: { supplier: supplierFromPurchase },
        supplier: purchase.supplier,
      } as unknown as PurchaseOrder)
    : undefined;

  return {
    kind: 'pickup',
    id: stock.id,
    // `order` is a required field on OrderItem but stock pickups have
    // no order — empty string keeps the type satisfied without
    // misleading the UI (the render path reads expand.purchase_order
    // for the PO column, never raw `order`).
    order: '',
    description,
    po_description: description,
    quantity: stock.quantity || 0,
    order_qty: stock.quantity || 0,
    item_status: 'assigned',
    drv_id: stock.drv_id,
    assigned_at: stock.assigned_at,
    notes: stock.notes,
    problem_flag: stock.problem_flag,
    problem_type: stock.problem_type as OrderItem['problem_type'],
    problem_notes: stock.problem_notes,
    is_stock_item: true,
    sku: stock.sku || stockItem?.sku,
    qty_collected: stock.quantity_received,
    expand: {
      supplier: supplierFromPurchase,
      purchase_order,
    },
  } as OrderItem;
};

// ---------- 2. POOL — every collection_pool item in the system ----------
// Pool means "open for any driver to claim". The driver app shows ALL
// pool rows here so the driver can see what's available before claiming.
// No driver filter on purpose.
export const getPoolItems = async (): Promise<OrderItem[]> => {
  try {
    const items = await pb.collection('order_items').getFullList<OrderItem>({
      filter: `item_status = "collection_pool"`,
      expand: 'supplier,order,purchase_order',
      sort: 'supplier.suppliername',
    });
    return items;
  } catch {
    const items = await pb.collection('order_items').getFullList<OrderItem>({
      filter: `item_status = "collection_pool"`,
    });
    return hydrateSuppliers(items);
  }
};

// ---------- 3. PROBLEMS — every flagged item in the system ----------
// Items with problem_flag=true OR item_status='problem'. No driver
// filter — problems are operational visibility, not personal lists.
export const getProblemItems = async (): Promise<OrderItem[]> => {
  try {
    const items = await pb.collection('order_items').getFullList<OrderItem>({
      filter: `problem_flag = true || item_status = "problem"`,
      expand: 'supplier,order,purchase_order',
      sort: '-updated',
    });
    return items;
  } catch {
    const items = await pb.collection('order_items').getFullList<OrderItem>({
      filter: `problem_flag = true || item_status = "problem"`,
    });
    return hydrateSuppliers(items);
  }
};

// Update order item status when collected. This is the canonical
// driver-side collection writer — the dashboard's
// `/api/v1/order-items/[id]/status` route covers the same patch from
// the operator side, so keep the field set aligned.
//
// Status flow on collection:
//   - Always sets:
//       * `item_status = "collected"`           (operator-side)
//       * `drv_status  = "collected"`           (driver-side status machine)
//       * `drv_collected_at = now`              (timestamp of physical pickup)
//       * `qty_collected = receivedQty`         (audit: actual qty picked up)
//   - Always sets `collection_photo` if a file was supplied.
//   - Quantity-mismatch behaviour:
//       * Full  (received === expected) → no extra flags. Clean collection.
//       * Partial (0 < received < expected) → `problem_flag = true`,
//         `problem_type = "stock"`, and a stock-shortage note in
//         `problem_notes`. The operator still sees the item as
//         collected but the problem flag surfaces it in the Problems
//         tab so a follow-up can be planned.
//       * Over   (received > expected) → `problem_flag = true` and a
//         `problem_notes` entry explaining the overage. No
//         `problem_type` because it's not a stock issue — the supplier
//         gave more than ordered, which can mean a packing error or a
//         promo. We leave the type empty so the operator picks.
//
// The helper intentionally doesn't compute `expected` itself — the
// caller passes `expectedQty` so the source of truth for "what was
// ordered" stays at the call site (where the same number was just
// shown to the driver in the modal).
export const updateCollectionStatus = async (
  id: string,
  status: string,
  data: {
    qty_collected?: number;
    notes?: string;
    collected_date?: string;
    photo?: File | null;
    expectedQty?: number;
    problem_type?: string;
    problem_flag?: boolean;
  }
) => {
  const patch: Record<string, unknown> = {
    item_status: status,
    drv_status: 'collected',
    drv_collected_at: new Date().toISOString(),
    qty_collected: data.qty_collected,
    collected_date: data.collected_date ?? new Date().toISOString(),
  };

  // Only forward the optional photo if a file was actually attached.
  // Passing `null`/undefined to a PB file field would clear an existing
  // attachment on subsequent updates, which we don't want for a
  // re-collect after the first one.
  if (data.photo) patch.collection_photo = data.photo;

  // Notes field keeps the driver's free-text commentary.
  if (data.notes !== undefined) patch.notes = data.notes;

  // Quantity-mismatch handling — see the doc-comment above.
  const received = typeof data.qty_collected === 'number' ? data.qty_collected : 0;
  const expected = typeof data.expectedQty === 'number' ? data.expectedQty : 0;
  if (expected > 0 && received > 0 && received < expected) {
    // Partial — short pickup. Flag so it surfaces in Problems.
    patch.problem_flag = true;
    patch.problem_type = 'stock';
    const userNote = (data.notes ?? '').trim();
    const autoNote = `Partial collection: ${received} of ${expected} units`;
    patch.problem_notes = userNote ? `${autoNote} — ${userNote}` : autoNote;
  } else if (expected > 0 && received > expected) {
    // Over-collection — supplier gave more than ordered. Flag without
    // a stock type so the operator picks the right follow-up.
    patch.problem_flag = true;
    patch.problem_type = '';
    const userNote = (data.notes ?? '').trim();
    const autoNote = `Over collection: ${received} units received against ${expected} ordered`;
    patch.problem_notes = userNote ? `${autoNote} — ${userNote}` : autoNote;
  }

  return await pb.collection('order_items').update(id, patch);
};

// ---------- Bulk helpers (no modal, used for "mark all collected" on
// a PO sub-group) ----------
//
// These skip the per-item modal flow (no photo, no per-item notes
// prompt) and stamp each row straight to its terminal status. The
// driver is presumed to have visually verified the items before
// tapping "Mark all collected on PO #1234" — the PO sub-header lists
// every item under it.
//
// Returns the count of items that were successfully transitioned.
// Items that throw are logged and excluded from the count so a single
// bad row doesn't poison the whole batch — the caller can decide
// whether to surface a follow-up toast for the failures.
export const bulkCollect = async (items: OrderItem[]): Promise<{ ok: number; failed: number }> => {
  let ok = 0;
  let failed = 0;
  for (const item of items) {
    try {
      const expectedQty = getItemDisplayQty(item);
      await pb.collection('order_items').update(item.id, {
        item_status: 'collected',
        drv_status: 'collected',
        drv_collected_at: new Date().toISOString(),
        qty_collected: expectedQty,
        collected_date: new Date().toISOString(),
      });
      ok += 1;
    } catch (e) {
      failed += 1;
      console.warn('[bulkCollect] failed for', item.id, e);
    }
  }
  return { ok, failed };
};

// Flag every row as a generic problem — used by the "Flag all" action
// on a PO sub-group. Each row gets the supplied note so the operator
// can see what was reported in bulk (no per-item modal flow).
export const bulkProblem = async (
  items: OrderItem[],
  description: string
): Promise<{ ok: number; failed: number }> => {
  let ok = 0;
  let failed = 0;
  for (const item of items) {
    try {
      await pb.collection('order_items').update(item.id, {
        item_status: 'problem',
        problem_type: 'other',
        problem_flag: true,
        problem_notes: description,
      });
      ok += 1;
    } catch (e) {
      failed += 1;
      console.warn('[bulkProblem] failed for', item.id, e);
    }
  }
  return { ok, failed };
};

// ---------- Stock-pickup writers (mirror of the order_items ones) ----------
// The driver-side collect/problem handlers in app/page.tsx branch on
// `item.kind === 'pickup'` and call these instead of
// `updateCollectionStatus` / `reportProblem`. Mirrors the same shape:
//   - collected -> status="collected", quantity_received=received
//   - partial   -> problem_flag + problem_type="stock" + auto note
//   - over      -> problem_flag + problem_type="" + auto note
//   - problem   -> problem_flag + problem_type + problem_notes
//
// No photo upload on the stock side — stock_purchase_items has no
// attachments file field wired in PB. Photos stay an order_items-only
// feature; the collect modal on a stock stop accepts a photo input
// but it's silently dropped here.
export const updateStockCollectionStatus = async (
  id: string,
  data: {
    qty_collected?: number;
    notes?: string;
    expectedQty?: number;
  }
) => {
  const patch: Record<string, unknown> = {
    status: 'collected',
    quantity_received: data.qty_collected ?? 0,
  };
  if (data.notes !== undefined) patch.notes = data.notes;

  const received = typeof data.qty_collected === 'number' ? data.qty_collected : 0;
  const expected = typeof data.expectedQty === 'number' ? data.expectedQty : 0;
  if (expected > 0 && received > 0 && received < expected) {
    patch.problem_flag = true;
    patch.problem_type = 'stock';
    const userNote = (data.notes ?? '').trim();
    const autoNote = `Partial collection: ${received} of ${expected} units`;
    patch.problem_notes = userNote ? `${autoNote} — ${userNote}` : autoNote;
  } else if (expected > 0 && received > expected) {
    patch.problem_flag = true;
    patch.problem_type = '';
    const userNote = (data.notes ?? '').trim();
    const autoNote = `Over collection: ${received} units received against ${expected} ordered`;
    patch.problem_notes = userNote ? `${autoNote} — ${userNote}` : autoNote;
  }

  return await pb.collection('stock_purchase_items').update(id, patch);
};

export const reportStockProblem = async (
  stockItemId: string,
  problemType: string,
  description: string
) => {
  return await pb.collection('stock_purchase_items').update(stockItemId, {
    problem_flag: true,
    problem_type: problemType,
    problem_notes: description,
  });
};

// Bulk versions — same pattern as the order_items bulk helpers, but
// filter the input list to only stock-pickup rows so a single bulk
// action across a mixed PO (orders + stock) doesn't cross-write.
export const bulkCollectStock = async (items: OrderItem[]): Promise<{ ok: number; failed: number }> => {
  const stockItems = items.filter((i) => i.kind === 'pickup');
  if (stockItems.length === 0) return { ok: 0, failed: 0 };
  let ok = 0;
  let failed = 0;
  for (const item of stockItems) {
    try {
      const expectedQty = getItemDisplayQty(item);
      await pb.collection('stock_purchase_items').update(item.id, {
        status: 'collected',
        quantity_received: expectedQty,
      });
      ok += 1;
    } catch (e) {
      failed += 1;
      console.warn('[bulkCollectStock] failed for', item.id, e);
    }
  }
  return { ok, failed };
};

export const bulkProblemStock = async (
  items: OrderItem[],
  description: string
): Promise<{ ok: number; failed: number }> => {
  const stockItems = items.filter((i) => i.kind === 'pickup');
  if (stockItems.length === 0) return { ok: 0, failed: 0 };
  let ok = 0;
  let failed = 0;
  for (const item of stockItems) {
    try {
      await pb.collection('stock_purchase_items').update(item.id, {
        problem_flag: true,
        problem_type: 'other',
        problem_notes: description,
      });
      ok += 1;
    } catch (e) {
      failed += 1;
      console.warn('[bulkProblemStock] failed for', item.id, e);
    }
  }
  return { ok, failed };
};

// ---------- Attachments ----------
// Upload a pickup photo by appending it to the order_item's
// `order_item_attachements` file field (PB file field, max multi).
// Uses the `fieldName+` append syntax so each upload is preserved
// alongside any previous files rather than replacing them.
//
// The source/notes params are accepted for interface compatibility
// but cannot be stored per-file without a separate attachment collection.
// Both are safe to drop here since the driver always uses
// source=driver_proof and notes go into order_items.notes separately.
//
// Throws on PB errors so the caller can roll back the status change.
export const uploadOrderItemAttachment = async (params: {
  orderItemId: string;
  file: File;
  source?: AttachmentSource;
  notes?: string;
}): Promise<OrderItemAttachment> => {
  const { orderItemId, file } = params;

  const formData = new FormData();
  // fieldName+ = append (never overwrite) existing files on the row
  formData.append('order_item_attachements+', file);

  const updated = await pb.collection('order_items').update(orderItemId, formData);
  // PB returns the updated order_item; extract the last filename as the
  // "id" for the returned OrderItemAttachment shape.
  const filenames: string[] = (updated as unknown as { order_item_attachements?: string[] }).order_item_attachements ?? [];
  const filename = filenames[filenames.length - 1] ?? file.name;

  return {
    id: filename, // no separate attachment id; filename is the key
    order_item: orderItemId,
    filename,
    file: filename,
    source: 'driver_proof',
    uploaded_at: new Date().toISOString(),
  } as unknown as OrderItemAttachment;
};

// List attachment filenames for an order item by fetching the file list
// from the order_item_attachements file field on the order_items row.
export const listOrderItemAttachments = async (
  orderItemId: string
): Promise<OrderItemAttachment[]> => {
  const item = await pb.collection('order_items').getOne(orderItemId);
  const filenames: string[] = (item as unknown as { order_item_attachements?: string[] }).order_item_attachements ?? [];
  return filenames.map((filename) => ({
    id: filename,
    order_item: orderItemId,
    filename,
    file: filename,
    source: 'driver_proof' as const,
    uploaded_at: '',
  })) as unknown as OrderItemAttachment[];
};

// ---------- Display helpers ----------
// Per the project brief:
//   po_description is the supplier-facing line (preferred on the PO
//   pickup screen); description is the customer-facing line. We always
//   show the supplier-facing line when it's there, and fall back to the
//   customer-facing one for legacy rows.
export const getItemDisplayDescription = (item: OrderItem): string => {
  const po = (item.po_description || '').trim();
  if (po) return po;
  return (item.description || '').trim() || '—';
};

// order_qty is the supplier-facing quantity (preferred on the pickup
// screen); quantity is the customer-facing quantity. Per the brief:
// order_qty "falls back to quantity if blank". We honor that order.
export const getItemDisplayQty = (item: OrderItem): number => {
  const oq = item.order_qty;
  if (typeof oq === 'number' && !Number.isNaN(oq) && oq > 0) return oq;
  const q = item.quantity;
  if (typeof q === 'number' && !Number.isNaN(q) && q > 0) return q;
  return 0;
};

// ---------- Driver-side claim action ----------
// When the driver sees an open item in Pool and wants to take it:
// set drv_id = me, item_status = "assigned", assigned_at = now.
export const claimItemForDriver = async (itemId: string) => {
  const user = getCurrentUser();
  if (!user) throw new Error('Not signed in');
  return await pb.collection('order_items').update(itemId, {
    drv_id: user.id,
    item_status: 'assigned',
    drv_status: 'assigned',
    assigned_at: new Date().toISOString(),
  });
};

// Report a problem on an order item
export const reportProblem = async (
  orderItemId: string,
  problemType: string,
  description: string
) => {
  return await pb.collection('order_items').update(orderItemId, {
    item_status: 'problem',
    problem_type: problemType,
    problem_flag: true,
    problem_notes: description,
  });
};

// Location tracking - tries to save, fails silently if table doesn't exist.
// IMPORTANT: PB schema (verified live 2026-07-08) stores the driver
// relation under `relation`, not `driver`. Writing to `driver` 400s and
// the row is never created — that's why the map polyline has been empty.
// If we ever migrate PB to rename the field back to `driver` (it should
// be — `relation` is a confusing name), update this + getDriverTrail.
export const saveDriverLocation = async (location: Omit<DriverLocation, 'id'>) => {
  try {
    return await pb.collection('driver_locations').create(location);
  } catch (e) {
    // Log now (was silent) — silent catches are how the `driver`-field
    // bug stayed hidden for months.
    console.warn('[saveDriverLocation] failed:', e instanceof Error ? e.message : e);
  }
};

// Get driver's location trail for today (for map polyline).
export const getDriverTrail = async (driverId: string) => {
  try {
    const today = new Date();
    today.setHours(0, 0, 0, 0);
    const records = await pb.collection('driver_locations').getFullList({
      filter: `relation = "${driverId}" && timestamp >= "${today.toISOString()}"`,
      sort: 'timestamp',
    });
    return records as unknown as DriverLocation[];
  } catch (e) {
    console.warn('[getDriverTrail] failed:', e instanceof Error ? e.message : e);
    return [];
  }
};

// Settings helpers
const SETTINGS_KEY = '1driver_settings';

export const getSettings = (): AppSettings => {
  if (typeof window === 'undefined') return DEFAULT_SETTINGS;
  const saved = localStorage.getItem(SETTINGS_KEY);
  if (saved) {
    try {
      return { ...DEFAULT_SETTINGS, ...JSON.parse(saved) };
    } catch {
      return DEFAULT_SETTINGS;
    }
  }
  return DEFAULT_SETTINGS;
};

export const saveSettings = (settings: Partial<AppSettings>) => {
  if (typeof window === 'undefined') return;
  const current = getSettings();
  const updated = { ...current, ...settings };
  localStorage.setItem(SETTINGS_KEY, JSON.stringify(updated));
  return updated;
};