// ============================================================
// Inventory data hook — loads all dash data (scoped by role/project)
// ============================================================

import { useCallback, useEffect, useMemo, useState } from "react";
import { apiV26 } from "../../lib/api";
import { useAuthStore } from "../../store/auth";
import { useDataChanged } from "../../lib/crossTab";
import type { InventoryRow, InventoryTransaction, Warehouse } from "../../lib/types";

export interface LookupData {
  categories: { id: string; slug: string; name: string }[];
  units: { id: number; code: string; name_fa: string | null }[];
  brands: { id: string; name: string }[];
  materials: { id: string; name: string; category: { id: string; name: string } | null; canonical_unit: { id: number; code: string; name_fa: string | null } | null }[];
  projects: { id: string; name: string; pm_user_id: string | null; pm_name?: string | null }[];
}

export interface InventoryData {
  warehouses: Warehouse[];
  inventory: InventoryRow[];
  transactions: InventoryTransaction[];
  lookup: LookupData;
  loading: boolean;
  refresh: () => Promise<void>;
}

export function useInventoryData(): InventoryData {
  const user = useAuthStore((s) => s.user);
  const isPM = user?.role === "pm";
  const projectId = isPM ? user.project_id || undefined : undefined;

  const [warehouses, setWarehouses] = useState<Warehouse[]>([]);
  const [inventory, setInventory] = useState<InventoryRow[]>([]);
  const [transactions, setTransactions] = useState<InventoryTransaction[]>([]);
  const [lookup, setLookup] = useState<LookupData>({
    categories: [], units: [], brands: [], materials: [], projects: [],
  });
  const [loading, setLoading] = useState(true);

  const load = useCallback(async () => {
    try {
      const [cats, units, brands, mats, projs, whs, inv, txs] = await Promise.all([
        apiV26.lookup.categories(),
        apiV26.lookup.units(),
        apiV26.lookup.brands(),
        apiV26.lookup.materials(),
        apiV26.lookup.projects(),
        apiV26.warehouses.list(projectId),
        apiV26.inventory.list({ project_id: projectId }),
        apiV26.inventory.transactions({ project_id: projectId }),
      ]);
      setLookup({ categories: cats, units, brands, materials: mats, projects: projs });
      setWarehouses(whs);
      setInventory(inv);
      setTransactions(txs);
    } catch {
      // پروژه‌ی فعال ممکن است همین حالا باطل شده باشد — گیتِ پروژه در سطح مسیر
      // (RequirePmProjects) پروژه‌ی جایگزین/صفحه‌ی خالی را نشان می‌دهد.
    } finally {
      setLoading(false);
    }
  }, [projectId]);

  useEffect(() => {
    setLoading(true);
    void load();
  }, [load]);

  // تب‌های دیگر (ثبت تراکنش/رسید در تب دوم) → بازخوانی خودکار همین صفحه
  useDataChanged(
    useCallback(() => {
      void load();
    }, [load]),
    ["quotes", "inventory"],
  );

  const scopedWarehouses = useMemo(
    () =>
      user?.role === "admin" || user?.role === "procurement_manager"
        ? warehouses
        : warehouses.filter((w) => String(w.project_id) === String(user?.project_id || "")),
    [warehouses, user?.role, user?.project_id],
  );

  return {
    warehouses: scopedWarehouses,
    inventory,
    transactions,
    lookup,
    loading,
    refresh: load,
  };
}

export function unitName(units: LookupData["units"], id: number | null | undefined): string {
  const u = units.find((x) => x.id === id);
  return u ? u.name_fa || u.code : "—";
}

export function brandName(brands: LookupData["brands"], id: string | null | undefined): string {
  const b = brands.find((x) => x.id === id);
  return b ? b.name : "—";
}

export function materialName(materials: LookupData["materials"], id: string): string {
  const m = materials.find((x) => x.id === id);
  return m ? m.name : "—";
}

export function catName(categories: LookupData["categories"], id: string | null | undefined): string {
  const c = categories.find((x) => x.id === id);
  return c ? c.name : "—";
}

export function projName(projects: LookupData["projects"], id: string | null | undefined): string {
  const p = projects.find((x) => x.id === id);
  return p ? p.name : "—";
}

export function whName(warehouses: Warehouse[], id: string | null | undefined): string {
  const w = warehouses.find((x) => x.id === id);
  return w ? w.name : "—";
}