"use client";

import { clientAuthFetch } from "@/app/utils/clientAuthFetch";
import { NEXT_PUBLIC_API_URL } from "@/config/api";
import { STOCK_TAKE_QTY_GAP_WARN_PERCENT } from "./stockTakeQtyGapWarning";

export const STOCK_TAKE_QTY_GAP_WARN_SETTING = "STOCK_TAKE.qtyGapWarnPercent";
export const STOCK_TAKE_QTY_GAP_SETTING_EVENT = "stock-take-qty-gap-warn-percent";

type SettingsRow = { name: string; value: string };

let cached: number | null = null;

export function parseQtyGapWarnPercent(raw: string | null | undefined): number {
  const text = String(raw ?? "").trim();
  if (!text) return STOCK_TAKE_QTY_GAP_WARN_PERCENT;
  const n = Number(text);
  if (!Number.isFinite(n) || n < 0 || n > 1000) return STOCK_TAKE_QTY_GAP_WARN_PERCENT;
  return Math.round(n);
}

export async function fetchStockTakeQtyGapWarnPercent(): Promise<number> {
  if (cached != null) return cached;
  const base = (NEXT_PUBLIC_API_URL ?? "").replace(/\/$/, "");
  const res = await clientAuthFetch(`${base}/settings`, { method: "GET" });
  if (!res.ok) return STOCK_TAKE_QTY_GAP_WARN_PERCENT;
  const rows = (await res.json()) as SettingsRow[];
  const value = rows.find((row) => row.name === STOCK_TAKE_QTY_GAP_WARN_SETTING)?.value;
  cached = parseQtyGapWarnPercent(value);
  return cached;
}

export async function saveStockTakeQtyGapWarnPercent(percent: number): Promise<void> {
  const base = (NEXT_PUBLIC_API_URL ?? "").replace(/\/$/, "");
  const res = await clientAuthFetch(
    `${base}/settings/${encodeURIComponent(STOCK_TAKE_QTY_GAP_WARN_SETTING)}`,
    {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ value: String(percent) }),
    },
  );
  if (!res.ok) {
    const text = await res.text().catch(() => "");
    throw new Error(text || `Failed to save setting: ${res.status}`);
  }
  cached = percent;
  window.dispatchEvent(new CustomEvent(STOCK_TAKE_QTY_GAP_SETTING_EVENT, { detail: percent }));
}