import { InfoCircleOutlined, MessageOutlined, ShrinkOutlined, SyncOutlined } from "@ant-design/icons";
import { useApolloClient, useLazyQuery, useQuery } from "@apollo/client";
import { Badge, Card, Col, Row, Space, Tag, Tooltip, Typography } from "antd";
import { useEffect, useState } from "react";
import { useTranslation } from "react-i18next";
import { connect } from "react-redux";
import { createStructuredSelector } from "reselect";
import { CONVERSATION_LIST_QUERY, UNREAD_CONVERSATION_COUNT } from "../../graphql/conversations.queries";
import { toggleChatVisible } from "../../redux/messaging/messaging.actions";
import { selectChatVisible, selectSelectedConversation } from "../../redux/messaging/messaging.selectors";
import ChatConversationListComponent from "../chat-conversation-list/chat-conversation-list.component";
import ChatConversationContainer from "../chat-conversation/chat-conversation.container";
import ChatNewConversation from "../chat-new-conversation/chat-new-conversation.component";
import LoadingSpinner from "../loading-spinner/loading-spinner.component";

import "./chat-popup.styles.scss";
import { useSocket } from "../../contexts/SocketIO/useSocket.js";

const mapStateToProps = createStructuredSelector({
  selectedConversation: selectSelectedConversation,
  chatVisible: selectChatVisible
});

const mapDispatchToProps = (dispatch) => ({
  toggleChatVisible: () => dispatch(toggleChatVisible())
});

export function ChatPopupComponent({ chatVisible, selectedConversation, toggleChatVisible }) {
  const { t } = useTranslation();
  const [pollInterval, setPollInterval] = useState(0);
  const { socket } = useSocket();
  const client = useApolloClient(); // Apollo Client instance for cache operations

  // Lazy query for conversations
  const [getConversations, { loading, data, refetch }] = useLazyQuery(CONVERSATION_LIST_QUERY, {
    fetchPolicy: "network-only",
    nextFetchPolicy: "network-only",
    skip: !chatVisible,
    ...(pollInterval > 0 ? { pollInterval } : {})
  });

  // Query for unread count when chat is not visible
  const { data: unreadData } = useQuery(UNREAD_CONVERSATION_COUNT, {
    fetchPolicy: "network-only",
    nextFetchPolicy: "network-only",
    pollInterval: 60 * 1000 // TODO: This is a fix for now, should be coming from sockets
  });

  // Socket connection status
  useEffect(() => {
    const handleSocketStatus = () => {
      if (socket?.connected) {
        setPollInterval(15 * 60 * 1000); // 15 minutes
      } else {
        setPollInterval(60 * 1000); // 60 seconds
      }
    };

    handleSocketStatus();

    if (socket) {
      socket.on("connect", handleSocketStatus);
      socket.on("disconnect", handleSocketStatus);
    }

    return () => {
      if (socket) {
        socket.off("connect", handleSocketStatus);
        socket.off("disconnect", handleSocketStatus);
      }
    };
  }, [socket]);

  // Fetch conversations when chat becomes visible
  useEffect(() => {
    if (chatVisible)
      getConversations({
        variables: {
          offset: 0
        }
      }).catch((err) => {
        console.error(`Error fetching conversations: ${(err, err.message || "")}`);
      });
  }, [chatVisible, getConversations]);

  // Get unread count from the cache
  const unreadCount = (() => {
    try {
      const cachedData = client.readQuery({
        query: CONVERSATION_LIST_QUERY,
        variables: { offset: 0 }
      });

      if (!cachedData?.conversations) {
        return unreadData?.messages_aggregate?.aggregate?.count;
      }

      // Aggregate unread message count
      return cachedData.conversations.reduce((total, conversation) => {
        const unread = conversation.messages_aggregate?.aggregate?.count || 0;
        return total + unread;
      }, 0);
    } catch (error) {
      console.warn("Unread count not found in cache:", error);
      return 0; // Fallback if not in cache
    }
  })();

  return (
    <Badge count={unreadCount}>
      <Card size="small">
        {chatVisible ? (
          <div className="chat-popup">
            <Space align="center">
              <Typography.Title level={4}>{t("messaging.labels.messaging")}</Typography.Title>
              <ChatNewConversation />
              <Tooltip title={t("messaging.labels.recentonly")}>
                <InfoCircleOutlined />
              </Tooltip>
              <SyncOutlined style={{ cursor: "pointer" }} onClick={() => refetch()} />
              {!socket?.connected && <Tag color="yellow">{t("messaging.labels.nopush")}</Tag>}
            </Space>
            <ShrinkOutlined
              onClick={() => toggleChatVisible()}
              style={{ position: "absolute", right: ".5rem", top: ".5rem" }}
            />

            <Row gutter={[8, 8]} className="chat-popup-content">
              <Col span={8}>
                {loading ? (
                  <LoadingSpinner />
                ) : (
                  <ChatConversationListComponent conversationList={data ? data.conversations : []} />
                )}
              </Col>
              <Col span={16}>{selectedConversation ? <ChatConversationContainer /> : null}</Col>
            </Row>
          </div>
        ) : (
          <div onClick={() => toggleChatVisible()} style={{ cursor: "pointer" }}>
            <MessageOutlined className="chat-popup-info-icon" />
            <strong>{t("messaging.labels.messaging")}</strong>
          </div>
        )}
      </Card>
    </Badge>
  );
}

export default connect(mapStateToProps, mapDispatchToProps)(ChatPopupComponent);
