"use client";

import { clientAuthFetch } from "@/app/utils/clientAuthFetch";
import { NEXT_PUBLIC_API_URL } from "@/config/api";
import { useCallback, useEffect, useState } from "react";

const POLL_MS = 60_000;

/** Match backend [PurchaseStockInAlertRow] JSON. */
export type PurchaseStockInAlertItem = {
  stockInLineId: number;
  purchaseOrderId: number;
  purchaseOrderLineId: number;
  poCode: string | null;
  itemNo: string | null;
  itemName: string | null;
  status: string | null;
  lineCreated: string | null;
  receiptDate: string | null;
  lotNo: string | null;
};

function parseAlertsPayload(raw: unknown): PurchaseStockInAlertItem[] {
  if (!Array.isArray(raw)) return [];
  return raw.map((r) => {
    const o = r as Record<string, unknown>;
    return {
      stockInLineId: Number(o.stockInLineId ?? o.stockinLineId ?? 0),
      purchaseOrderId: Number(o.purchaseOrderId ?? o.purchaseorderid ?? 0),
      purchaseOrderLineId: Number(o.purchaseOrderLineId ?? o.purchaseorderlineid ?? 0),
      poCode: o.poCode != null ? String(o.poCode) : null,
      itemNo: o.itemNo != null ? String(o.itemNo) : null,
      itemName: o.itemName != null ? String(o.itemName) : null,
      status: o.status != null ? String(o.status) : null,
      lineCreated: o.lineCreated != null ? String(o.lineCreated) : null,
      receiptDate: o.receiptDate != null ? String(o.receiptDate) : null,
      lotNo: o.lotNo != null ? String(o.lotNo) : null,
    };
  });
}

/**
 * Recent PO stock-in lines in pending / receiving (backend lookback window).
 * Fetches full list for alert dialog + count for badge.
 */
export function usePurchaseStockInAlerts(enabled: boolean, days?: number) {
  const [items, setItems] = useState<PurchaseStockInAlertItem[]>([]);
  const [count, setCount] = useState(0);
  const [loading, setLoading] = useState(false);

  const load = useCallback(async () => {
    if (!enabled) {
      setItems([]);
      setCount(0);
      return;
    }
    setLoading(true);
    try {
      const listParams = new URLSearchParams();
      if (days != null && Number.isFinite(days)) listParams.set("days", String(days));
      listParams.set("limit", "80");
      const listUrl = `${NEXT_PUBLIC_API_URL}/stockInLine/alerts/purchase-incomplete?${listParams}`;

      const countParams = new URLSearchParams();
      if (days != null && Number.isFinite(days)) countParams.set("days", String(days));
      const countSuffix = countParams.toString() ? `?${countParams}` : "";
      const countUrl = `${NEXT_PUBLIC_API_URL}/stockInLine/alerts/purchase-incomplete-count${countSuffix}`;
      const [resList, resCount] = await Promise.all([
        clientAuthFetch(listUrl),
        clientAuthFetch(countUrl),
      ]);
      if (!resList.ok) {
        setItems([]);
      } else {
        const data = await resList.json();
        setItems(parseAlertsPayload(data));
      }
      if (resCount.ok) {
        const c = (await resCount.json()) as { count?: number };
        const n = Number(c.count ?? 0);
        setCount(Number.isFinite(n) && n > 0 ? n : 0);
      } else {
        setCount(0);
      }
    } catch {
      setItems([]);
      setCount(0);
    } finally {
      setLoading(false);
    }
  }, [enabled, days]);

  useEffect(() => {
    if (!enabled) {
      setItems([]);
      setCount(0);
      return;
    }
    void load();
    const id = window.setInterval(() => void load(), POLL_MS);
    return () => window.clearInterval(id);
  }, [enabled, load]);

  return { items, count, loading, reload: load };
}