/** 消息通知 — 1:1 复刻 uni-app pages/notify/index.vue + 真实 API */
import { useEffect, useState } from "react";
import { useNavigate } from "react-router-dom";
import { useAuth } from "../contexts/AuthContext";
import {
  getNotifications,
  markNotificationRead,
  type NotificationItem,
} from "../services/notificationApi";

// ============================================================
// 类型常量
// ============================================================

const TYPE_CONFIG: Record<string, { icon: string; title: string }> = {
  TRANSFER: { icon: "🟢", title: "新任务派发" },
  REJECT: { icon: "🔴", title: "品质驳回提醒" },
};

function formatTime(t: string) {
  if (!t) return "";
  const d = new Date(t);
  const pad = (n: number) => String(n).padStart(2, "0");
  return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}`;
}

// ============================================================
// Page 组件
// ============================================================

export default function NotificationsPage() {
  const { user } = useAuth();
  const navigate = useNavigate();

  const [notifications, setNotifications] = useState<NotificationItem[]>([]);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    fetchNotifications();
  }, [user]); // eslint-disable-line react-hooks/exhaustive-deps

  async function fetchNotifications() {
    const userId = user?.username || user?.id || "";
    if (!userId) {
      setLoading(false);
      return;
    }
    setLoading(true);
    try {
      const res = await getNotifications(userId);
      setNotifications(res.notifications || []);
    } catch {
      setNotifications([]);
    } finally {
      setLoading(false);
    }
  }

  async function handleCardTap(item: NotificationItem) {
    // 标记已读
    if (!item.is_read) {
      try {
        await markNotificationRead(item.id);
        setNotifications((prev) =>
          prev.map((n) => (n.id === item.id ? { ...n, is_read: true } : n))
        );
      } catch {
        // 静默
      }
    }

    // 跳转详情页
    if (item.task_id) {
      navigate(`/scan?taskId=${item.task_id}`);
    }
  }

  // ==========================================================
  // 渲染
  // ==========================================================

  return (
    <div className="flex min-h-full flex-col px-4 pt-safe pb-20">
      {/* 标题区 — 与 uni-app 完全一致 */}
      <div className="mb-5">
        <h2 className="text-xl font-bold text-gray-800">消息通知</h2>
        <p className="mt-1 text-[13px] text-gray-400">任务流转和系统通知</p>
      </div>

      {/* 加载中 */}
      {loading && (
        <div className="flex flex-1 items-center justify-center py-20 text-sm text-gray-400">
          加载中...
        </div>
      )}

      {/* 空状态 */}
      {!loading && notifications.length === 0 && (
        <div className="flex flex-1 flex-col items-center justify-center pb-24">
          <span className="text-[64px] leading-none">🔔</span>
          <span className="mt-3 text-sm text-gray-400">暂无新消息</span>
        </div>
      )}

      {/* 通知列表 */}
      {!loading && notifications.length > 0 && (
        <div className="flex flex-col gap-2.5">
          {notifications.map((item) => {
            const cfg = TYPE_CONFIG[item.type] || {
              icon: "📌",
              title: "系统通知",
            };
            return (
              <div
                key={item.id}
                onClick={() => handleCardTap(item)}
                className={`flex cursor-pointer items-start gap-2.5 rounded-xl bg-white p-3.5 shadow-[0_1px_3px_rgba(0,0,0,0.06)] transition-all active:scale-[0.98] ${
                  !item.is_read
                    ? "border-l-[3px] border-l-blue-600 shadow-[0_1px_6px_rgba(37,99,235,0.1)]"
                    : ""
                }`}
              >
                {/* 左侧：未读红点 + 类型图标 */}
                <div className="flex w-7 shrink-0 flex-col items-center gap-1">
                  {!item.is_read && (
                    <span className="h-2 w-2 rounded-full bg-red-500 shadow-[0_0_0_3px_rgba(239,68,68,0.15)]" />
                  )}
                  <span
                    className={`text-xl leading-none ${
                      item.is_read ? "opacity-50" : ""
                    }`}
                  >
                    {cfg.icon}
                  </span>
                </div>

                {/* 右侧：内容 */}
                <div className="min-w-0 flex-1">
                  <div className="mb-1.5 flex items-center justify-between gap-2">
                    <span
                      className={`text-[15px] font-semibold ${
                        item.is_read ? "text-gray-600" : "font-bold text-gray-800"
                      }`}
                    >
                      {cfg.title}
                    </span>
                    <span className="shrink-0 text-[11px] text-gray-400">
                      {formatTime(item.created_at)}
                    </span>
                  </div>
                  <p className="text-[13px] leading-relaxed text-gray-500 break-all">
                    {item.content}
                  </p>
                </div>

                <span className="mt-1.5 shrink-0 text-xl text-gray-300">›</span>
              </div>
            );
          })}
        </div>
      )}
    </div>
  );
}