fishfish/frontend/src/pages/AdminOrderPage.jsx

import { useState, useEffect } from "react";
import { getAdminOrder } from "../api";
import { useParams, useNavigate } from "react-router-dom";

// Статусы заказа — ПОДСТАВЬ свои, если в БД они другие
const STATUSES = [
  { value: "new", label: "Новый" },
  { value: "prepared", label: "Собран" },
  { value: "shipped", label: "Отправлен" },
  { value: "delivered", label: "Доставлен" },
  { value: "canceled", label: "Отменён" },
];

export default function AdminOrderDetail({ orderId }) {
  const [order, setOrder] = useState(null);
  const [status, setStatus] = useState("");
  const [items, setItems] = useState([]); // редактируемая копия позиций
  const [loading, setLoading] = useState(false);
  const [saving, setSaving] = useState(false);
  const [error, setError] = useState("");

  const { id } = useParams();
  const navigate = useNavigate();

  // Загружаем заказ при монтировании / смене orderId
  useEffect(() => {
    setError("");
    setLoading(true);

    getAdminOrder(id)
      .then((res) => {
        setOrder(res.data);
        setStatus(res.data.status);
        setItems((res.data.items ?? []).map((it) => ({ ...it })));
      })
      .catch((err) => {
        setError(err.response?.data?.error ?? "Не удалось загрузить заказ");
      })
      .finally(() => { });
  }, [orderId]);

  function handleQuantityChange(itemId, value) {
    setItems((prev) =>
      prev.map((it) =>
        it.item_id === itemId
          ? { ...it, quantity: value === "" ? "" : parseFloat(value) }
          : it,
      ),
    );
  }

  // Пересчёт итога на лету
  const total = items.reduce((sum, it) => {
    const q = typeof it.quantity === "number" ? it.quantity : 0;
    return sum + it.price * q;
  }, 0);

  if (!loading) {
    return <div className="p-6 text-slate-300">Загрузка заказа…</div>;
  }

  if (!order) {
    return (
      <div className="p-6">
        <p className="text-red-400">{error || "Заказ не найден"}</p>
        <button
          onClick={() => navigate("/admin")}
          className="mt-4 text-slate-300 hover:text-white"
        >
          ← Назад к заказам
        </button>
      </div>
    );
  }

  const created = order.created_at
    ? new Date(order.created_at).toLocaleString("ru-RU")
    : "";

  return (
    <div className="max-w-2xl mx-auto p-4 sm:p-6">
      {/* Шапка */}
      <div className="flex items-center justify-between mb-6">
        <button
          onClick={() => navigate("/admin")}
          className="text-slate-400 hover:text-white transition-colors"
        >
          ← Заказы
        </button>
        <h1 className="text-lg font-semibold text-white">
          Заказ #{order.order_id}
        </h1>
      </div>

      {error && (
        <div className="mb-4 rounded-lg bg-red-500/10 border border-red-500/30 px-4 py-2 text-red-400 text-sm">
          {error}
        </div>
      )}

      {/* Мета заказа */}
      <div className="rounded-xl bg-slate-800 p-4 mb-4 space-y-3">
        {order.address && (
          <div className="flex justify-between text-sm">
            <span className="text-slate-400">Адрес</span>
            <span className="text-slate-200">{order.address}</span>
          </div>
        )}
        {created && (
          <div className="flex justify-between text-sm">
            <span className="text-slate-400">Создан</span>
            <span className="text-slate-200">{created}</span>
          </div>
        )}

        {/* Редактируемый статус */}
        <div className="flex items-center justify-between">
          <span className="text-slate-400 text-sm">Статус</span>
          <select
            value={status}
            onChange={(e) => setStatus(e.target.value)}
            className="bg-slate-700 text-white rounded-lg px-3 py-1.5 text-sm outline-none focus:ring-2 focus:ring-sky-500"
          >
            {STATUSES.map((s) => (
              <option
                key={s.value}
                value={s.value}
                className="bg-slate-800 text-white"
              >
                {s.label}
              </option>
            ))}
          </select>
        </div>
      </div>

      {/* Позиции с редактируемым весом */}
      <div className="rounded-xl bg-slate-800 divide-y divide-slate-700 mb-4">
        {items.map((it) => (
          <div key={it.item_id} className="flex items-center gap-3 p-4">
            <div className="grow min-w-0">
              <p className="text-white truncate">{it.name}</p>
              <p className="text-slate-400 text-sm">
                {it.price} ₽ / {it.unit}
              </p>
            </div>

            <div className="shrink-0 flex items-center gap-2">
              <input
                type="number"
                step="0.001"
                min="0"
                value={it.quantity}
                onChange={(e) =>
                  handleQuantityChange(it.item_id, e.target.value)
                }
                className="w-20 bg-slate-700 text-white rounded-lg px-2 py-1.5 text-right outline-none focus:ring-2 focus:ring-sky-500"
              />
              <span className="text-slate-400 text-sm w-8">{it.unit}</span>
            </div>

            <div className="shrink-0 w-24 text-right text-slate-200">
              {(
                it.price * (typeof it.quantity === "number" ? it.quantity : 0)
              ).toFixed(2)}{" "}
              ₽
            </div>
          </div>
        ))}
      </div>

      {/* Итог */}
      <div className="flex justify-between items-center px-4 mb-6">
        <span className="text-slate-400">Итого</span>
        <span className="text-xl font-semibold text-white">
          {total.toFixed(2)} ₽
        </span>
      </div>

      {/* Сохранить */}
      <button
        disabled={saving}
        className="w-full bg-sky-600 hover:bg-sky-500 disabled:opacity-50 text-white rounded-xl py-3 font-medium transition-colors"
      >
        {saving ? "Сохранение…" : "Сохранить изменения"}
      </button>
    </div>
  );
}