import React, { useState, useEffect, useContext } from 'react';
import { timeFormat } from "d3-time-format";
import { Table, Row } from "antd";
import { formatDistanceToNow } from "date-fns";
import { UserOutlined} from "@ant-design/icons";
import Chart from "./components/chart";
import StatisticItem from "./components/statistic";

import { BroadcastStatusContext } from './utils/broadcast-status-context';

import {
  CONNECTED_CLIENTS,
  STREAM_STATUS, VIEWERS_OVER_TIME,
  fetchData,
} from "./utils/apis";

const FETCH_INTERVAL = 5 * 60 * 1000; // 5 mins

export default function ViewersOverTime() {
  const context = useContext(BroadcastStatusContext);
  const { broadcastActive } = context || {};

  const [viewerInfo, setViewerInfo] = useState([]);
  const [clients, setClients] = useState([]);
  const [stats, setStats] = useState(null);

  const getInfo = async () => {
    try {
      const result = await fetchData(VIEWERS_OVER_TIME);
      setViewerInfo(result);
    } catch (error) {
      console.log("==== error", error);
    }

    try {
      const result = await fetchData(CONNECTED_CLIENTS);
      console.log("result", result);
      setClients(result);
    } catch (error) {
      console.log("==== error", error);
    }

    try {
      const result = await fetchData(STREAM_STATUS);
      setStats(result);
    } catch (error) {
      console.log(error);
    }

  };

  useEffect(() => {
    let getStatusIntervalId = null;

    getInfo();
    if (broadcastActive) {
      getStatusIntervalId = setInterval(getInfo, FETCH_INTERVAL);
      // returned function will be called on component unmount
      return () => {
        clearInterval(getStatusIntervalId);
      };
    }

    return () => [];
  }, []);

  // todo - check to see if broadcast active has changed. if so, start polling.

  if (!viewerInfo.length) {
    return "no info";
  }


  const columns = [
    {
      title: "User name",
      dataIndex: "username",
      key: "username",
      render: (username) => username || "-",
      sorter: (a, b) => a.username - b.username,
      sortDirections: ["descend", "ascend"],
    },
    {
      title: "Messages sent",
      dataIndex: "messageCount",
      key: "messageCount",
      sorter: (a, b) => a.messageCount - b.messageCount,
      sortDirections: ["descend", "ascend"],
    },
    {
      title: "Connected Time",
      dataIndex: "connectedAt",
      key: "connectedAt",
      render: (time) => formatDistanceToNow(new Date(time)),
    },
    {
      title: "User Agent",
      dataIndex: "userAgent",
      key: "userAgent",
    },
    {
      title: "Location",
      dataIndex: "geo",
      key: "geo",
      render: (geo) => geo && `${geo.regionName}, ${geo.countryCode}`,
    },
  ];

  const timeFormatter = (tick) => {
    return timeFormat("%H:%M")(new Date(tick));
  };

  const CustomizedTooltip = (props) => {
    const { active, payload, label } = props;
    if (active) {
      const numViewers = payload && payload[0] && payload[0].value;
      const time = timeFormatter(label);
      const message = `${numViewers} viewer(s) at ${time}`;
      return (
        <div className="custom-tooltip">
          <p className="label">{message}</p>
        </div>
      );
    }
    return null;
  };

  /*
geo data looks like this
  "geo": {
    "countryCode": "US",
    "regionName": "California",
    "timeZone": "America/Los_Angeles"
  }
*/
  
  return (
    <div>
      <h2>Current Viewers</h2>
      <Row gutter={[16, 16]}>
        <StatisticItem
          title="Current viewers"
          value={stats?.viewerCount ?? ""}
          prefix={<UserOutlined />}
        />
        <StatisticItem
          title="Peak viewers this session"
          value={stats?.sessionMaxViewerCount ?? ""}
          prefix={<UserOutlined />}
        />
      </Row>
      <div className="chart-container">
        <Chart data={viewerInfo} color="#ff84d8" unit="" />

        <div>
          <Table dataSource={clients} columns={columns} />;
        </div>
      </div>
    </div>
  );
}
