import React, { useState, useRef, useEffect } from "react";
import { Modal, Button, Tabs, Empty, message } from "antd";
import type { TabsProps } from "antd";
import axios from "axios";
import { MESSAGE_STATUS, MESSAGE_TAB } from "@/constants";
import { useNotificationStore } from "@/store/NotificationStore";
import { Eraser, FileText } from "lucide-react";
import dayjs from "dayjs";
import { renderNoticeLength } from "@/utils/utils";

interface MessageModalProps {
  visible: boolean;
  onClose: () => void;
  fetchNoticeList: (id?: number, isRead?: number) => Promise<any[]>;
}

const MessageModal: React.FC<MessageModalProps> = ({
  visible,
  onClose,
  fetchNoticeList,
}) => {
  const [activeKey, setActiveKey] = useState(MESSAGE_TAB.UNREAD);
  const { notifications, changeNotification } = useNotificationStore();
  const [loading, setLoading] = useState(false);
  const [hasMore, setHasMore] = useState(true); // 新增状态，用于标记是否还有更多数据
  const observerRef = useRef<HTMLDivElement>(null);

  const unreadNotifications = notifications.filter(
    (notification) => notification.is_read === MESSAGE_STATUS.UNREAD
  );

  // 根据activeKey获取对应的isRead值
  const getIsReadStatus = (tabKey: string) => {
    switch (tabKey) {
      case MESSAGE_TAB.UNREAD:
        return MESSAGE_STATUS.UNREAD;
      case MESSAGE_TAB.HAS_READ:
        return MESSAGE_STATUS.HAS_READ;
      default:
        return undefined; // 全部消息时不传isRead参数
    }
  };

  useEffect(() => {
    const observer = new IntersectionObserver(
      async (entries) => {
        const target = entries[0];
        if (target.isIntersecting && !loading && hasMore) {
          const filteredNotifications = getFilteredNotifications();
          if (filteredNotifications.length > 0) {
            setLoading(true);
            const lastId =
              filteredNotifications[filteredNotifications.length - 1].id;
            try {
              const isRead = getIsReadStatus(activeKey);
              const newMessages = await fetchNoticeList(lastId, isRead);
              if (newMessages.length === 0) {
                setHasMore(false);
                setLoading(false);
                return;
              }
            } catch (error) {
              console.error("Failed to fetch more messages:", error);
            }
            setLoading(false);
          }
        }
      },
      {
        threshold: 0.1,
      }
    );

    if (observerRef.current) {
      observer.observe(observerRef.current);
    }

    return () => observer.disconnect();
  }, [loading, fetchNoticeList, activeKey, hasMore]); // 添加hasMore作为依赖

  // 获取过滤后的通知列表
  const getFilteredNotifications = () => {
    let filteredNotifications = notifications;

    if (activeKey === MESSAGE_TAB.UNREAD) {
      filteredNotifications = notifications.filter(
        (notification) => notification.is_read === MESSAGE_STATUS.UNREAD
      );
    } else if (activeKey === MESSAGE_TAB.HAS_READ) {
      filteredNotifications = notifications.filter(
        (notification) => notification.is_read === MESSAGE_STATUS.HAS_READ
      );
    }

    return filteredNotifications;
  };

  const tabItems: TabsProps["items"] = [
    {
      key: MESSAGE_TAB.ALL,
      label: <span className="flex">全部</span>,
    },
    {
      key: MESSAGE_TAB.UNREAD,
      label: (
        <span className="flex">
          未读
          {!!unreadNotifications.length && (
            <span className="ml-1 text-xs text-white bg-red-500 rounded-full w-5 h-5 flex justify-center items-center">
              {renderNoticeLength(unreadNotifications)}
            </span>
          )}
        </span>
      ),
    },
    {
      key: MESSAGE_TAB.HAS_READ,
      label: <span className="flex">已读</span>,
    },
  ];

  // 简化 Tab 切换处理函数
  const handleTabChange = (key: string) => {
    setActiveKey(key);
    setHasMore(true); // 切换tab时重置hasMore状态
  };

  return (
    <Modal
      title={
        <div className="flex items-center">
          <span>
            消息中心
            {!!renderNoticeLength(unreadNotifications) &&
              `(${renderNoticeLength(unreadNotifications)})`}
          </span>
          <div
            className="cursor-pointer hover:bg-gray-100 rounded-md px-2 py-1 ml-2 text-xs flex justify-center items-center gap-1"
            onClick={async () => {
              const baseUrl =
                import.meta.env.MODE === "development"
                  ? "/notification"
                  : import.meta.env.VITE_NOTIFICATION_URL;
              const res = await axios.post(`${baseUrl}/bazb/clearMsg`);
              if (res.data.code === 200) {
                changeNotification({ type: "clear" });
              }
            }}
          >
            <Eraser size={12} />
            清除消息
          </div>
        </div>
      }
      open={visible}
      onCancel={onClose}
      footer={null}
      style={{
        top: 30,
        maxWidth: "90%",
        maxHeight: "80%",
      }}
    >
      <div className="flex flex-col h-[80vh]">
        <Tabs
          activeKey={activeKey}
          items={tabItems}
          className="mb-4"
          onChange={handleTabChange}
        />
        <div className="space-y-4 max-h-[100%] overflow-auto">
          {(() => {
            const filteredNotifications = getFilteredNotifications();

            return (
              <>
                {filteredNotifications.length === 0 ? (
                  <div className="flex justify-center items-center h-full">
                    <Empty description="暂无消息" />
                  </div>
                ) : (
                  <>
                    {filteredNotifications.map((message, index) => (
                      <div
                        key={index}
                        className="p-4 bg-gray-50 rounded-lg shadow-sm flex flex-col gap-4"
                      >
                        <div className="flex justify-between items-center">
                          <div className="flex gap-1 items-center">
                            <div className="p-1 bg-blue-500 rounded-full w-6 h-6 text-white flex justify-center items-center">
                              <FileText size={14} />
                            </div>
                            <div className="font-bold">病例时效提醒</div>
                          </div>
                          <div className="text-gray-500 text-xs">
                            {dayjs(message.push_time).format(
                              "YYYY-MM-DD HH:mm:ss"
                            )}
                          </div>
                        </div>
                        <div className="flex items-start space-x-4">
                          <div className="flex-1">
                            <div className="flex">
                              <h4 className="text-sm font-semibold">
                                {message.title}
                              </h4>
                            </div>
                            <p className="text-gray-700 mt-1 indent-[1.75rem]">
                              {message.content}
                            </p>
                            <p className="text-gray-700 mt-1 indent-[1.75rem]">
                              {message.footer || "祝您工作顺利！"}
                            </p>
                            <div className="mt-2 flex space-x-2 justify-end">
                              <Button
                                type="primary"
                                size="middle"
                                onClick={() => {
                                  axios.post("/notification/bazb/clearMsg", {
                                    msgId: message.id,
                                  });
                                  changeNotification({
                                    type: "clear",
                                    notification: [message.id],
                                  });
                                }}
                              >
                                知道了
                              </Button>
                              <Button size="middle">去查看</Button>
                            </div>
                          </div>
                        </div>
                      </div>
                    ))}
                    {loading && (
                      <div className="flex justify-center items-center py-4">
                        <div className="text-gray-500">加载中...</div>
                      </div>
                    )}
                    {hasMore && (
                      <div ref={observerRef} style={{ height: "20px" }} />
                    )}
                  </>
                )}
              </>
            );
          })()}
        </div>
      </div>
    </Modal>
  );
};

export default MessageModal;