import React, { useState, useCallback, useEffect, useRef } from "react";
import {
  BrowserRouter as Router,
  Route,
  Routes,
  useParams
} from "react-router-dom";

import Paper from '@material-ui/core/Paper';
import Button from '@material-ui/core/Button';

import { GlobalContext } from "./GlobalContext.js";
//import { PingPong } from "./PingPong.js";
import { PlayerList } from "./PlayerList.js";
import { Chat } from "./Chat.js";
import { MediaAgent } from "./MediaControl.js";
import { Board } from "./Board.js";
import { Actions } from "./Actions.js";
import { base, gamesPath } from './Common.js';
import { GameOrder } from "./GameOrder.js";
import { Activities } from "./Activities.js";
import { SelectPlayer } from "./SelectPlayer.js";
import { PlayersStatus } from "./PlayersStatus.js";
import { ViewCard } from "./ViewCard.js";
import { ChooseCard } from "./ChooseCard.js";
import { Hand } from "./Hand.js";
import { Trade } from "./Trade.js";
import { Winner } from "./Winner.js";

import history from "./history.js";
import "./App.css";

const Table = () => {
  const params = useParams();
  const [ gameId, setGameId ] = useState(params.gameId ? params.gameId : undefined);
  const [ ws, setWs ] = useState();
  const [ name, setName ] = useState("");
  const [ error, setError ] = useState(undefined);
  const [ warning, setWarning ] = useState(undefined);
  const [ peers, setPeers ] = useState({});
  const [loaded, setLoaded] = useState(false);
  const [connecting, setConnecting] = useState(undefined);
  const [state, setState] = useState(undefined);
  const [color, setColor] = useState(undefined);
  const [players, setPlayers] = useState(undefined);
  const [player, setPlayer] = useState(undefined);
  const [buildActive, setBuildActive] = useState(false);
  const [cardActive, setCardActive] = useState(undefined);
  const fields = [ 'id', 'state', 'color', 'name' ];

  useEffect(() => {
    console.log(`app - media-agent - peers`, peers);
  }, [peers]);
  
  const onWsOpen = (event) => {
    console.log(`ws: open`);
    setError("");

    /* We do not set the socket as connected until the 'open' message
     * comes through */
    setConnecting(event.target);
    
    /* Request a full game-update
     * We only need gameId and name for App.js, however in the event
     * of a network disconnect, we need to refresh the entire game
     * state on reload so all bound components reflect the latest
     * state */
    event.target.send(JSON.stringify({
      type: 'game-update'
    }));
    event.target.send(JSON.stringify({
      type: 'get',
      fields
    }));
  };

  const onWsMessage = (event) => {
    const data = JSON.parse(event.data);
    switch (data.type) {
    case 'error':
      console.error(`App - error`, data.error);
      setError(data.error);
      break;
    case 'warning':
      console.warn(`App - warning`, data.warning);
      setWarning(data.warning);
      setTimeout(() => {
        console.log(`todo: stack warnings in a window and have them disappear one at a time.`);
        console.log(`app - clearing warning`);
        setWarning("");
      }, 3000);
      break;
    case 'game-update':
      if (!loaded) {
        setLoaded(true);
      }
      console.log(`ws: message - ${data.type}`, data.update);
      if ('player' in data.update) {
        const player = data.update.player;
        if (player.name !== name) {
          console.log(`App - setting name (via player): ${data.update.name}`);
          setName(data.update.name);
        }
        if (player.color !== color) {
          console.log(`App - setting color (via player): ${data.update.color}`);
          setColor(data.update.color);
        }
      }
      if ('players' in data.update) {
        setPlayers(data.update.players);
        if (color in data.update.players) {
          if (player !== data.update.players[color]) {
            setPlayer(data.update.players[color]);
          }
        } else {
          if (player) {
            setPlayer(undefined);
          }
          if (color) {
            setColor(undefined);
          }
        }
      }
      if ('name' in data.update && data.update.name !== name) {
        console.log(`App - setting name: ${data.update.name}`);
        setName(data.update.name);
      }
      if ('id' in data.update && data.update.id !== gameId) {
        console.log(`App - setting gameId ${data.update.id}`);
        setGameId(data.update.id);
      }
      if ('state' in data.update && data.update.state !== state) {
        console.log(`App - setting game state: ${data.update.state}`);
        setState(data.update.state);
      }
      if ('color' in data.update && data.update.color !== color) {
        console.log(`App - setting color: ${color}`);
        setColor(data.update.color);
        if (players && players[data.update.color] !== player) {
          setPlayer(players[data.update.color]);
        }
      }
      break;
    default:
      break;
    }
  };
  
  const cbResetConnection = useCallback(() => {
    let timer = 0;
    function reset() {
      timer = 0;
      setConnecting(undefined);
    };
    return _ => {
      if (timer) {
        clearTimeout(timer);
      }
      timer = setTimeout(reset, 5000);
    };
  }, [setConnecting]);

  const resetConnection = cbResetConnection();

  const onWsError = (event) => {
    console.error(`ws: error`, event);
    const error = `Connection to Ketr Ketran game server failed! ` +
      `Connection attempt will be retried every 5 seconds.`;
    setError(error);
    setWs(undefined);
    resetConnection();
  };
  
  const onWsClose = (event) => {
    const error = `Connection to Ketr Ketran game was lost. ` +
      `Attempting to reconnect...`;
    console.warn(`ws: close`);
    setError(error);
    setWs(undefined);
    resetConnection();
  };

  /* callback refs are used to provide correct state reference
   * in the callback handlers, while also preventing rebinding
   * of event handlers on every render */
  const refWsOpen = useRef(onWsOpen);
  useEffect(() => { refWsOpen.current = onWsOpen; });
  const refWsMessage = useRef(onWsMessage);
  useEffect(() => { refWsMessage.current = onWsMessage; });
  const refWsClose = useRef(onWsClose);
  useEffect(() => { refWsClose.current = onWsClose; });
  const refWsError = useRef(onWsError);
  useEffect(() => { refWsError.current = onWsError; });
  
  /* This effect is responsible for triggering a new game load if a 
   * game id is not provided in the URL. If the game is provided
   * in the URL, the backend will create a new game if necessary
   * during the WebSocket connection sequence.
   * 
   * This should be the only HTTP request made from the game.
   */
  useEffect(() => {
    if (gameId) {
      console.log(`Game in use ${gameId}`)
      return;
    }
 
    console.log(`Requesting new game.`);

    window.fetch(`${base}/api/v1/games/`, {
      method: 'POST',
      cache: 'no-cache',
      credentials: 'same-origin',
      headers: {
        'Content-Type': 'application/json'
      },
    }).then((res) => {
      if (res.status >= 400) {
        const error = `Unable to connect to Ketr Ketran game server! ` +
          `Try refreshing your browser in a few seconds.`;
        console.error(error);
        setError(error);
        throw error;
      }
      return res.json();
    }).then((update) => {
      if (update.id !== gameId) {
        console.log(`New game started: ${update.id}`);
        history.push(`${gamesPath}/${update.id}`);
        setGameId(update.id);
      }
    });
  }, [ gameId, setGameId ]);

  
  /* Once a game id is known, create the sole WebSocket connection
   * to the backend. This WebSocket is then shared with any component
   * that performs game state updates. Those components should 
   * bind to the 'message:game-update' WebSocket event and parse
   * their update information from those messages 
   */
  useEffect(() => {
    if (!gameId) {
      return;
    }

    const unbind = () => {
      console.log(`table - unbind`);
    }

    console.log(`table - bind`);

    if (!ws && !connecting) {
      let loc = window.location, new_uri;
      if (loc.protocol === "https:") {
        new_uri = "wss";
      } else {
        new_uri = "ws";
      }
      new_uri = `${new_uri}://${loc.host}${base}/api/v1/games/ws/${gameId}`;
      console.log(`Attempting WebSocket connection to ${new_uri}`);
      setWs(new WebSocket(new_uri));
      setConnecting(undefined);
      return unbind;
    }

    if (!ws) {
      return unbind;
    }

    const cbOpen = e => refWsOpen.current(e);
    const cbMessage = e => refWsMessage.current(e);
    const cbClose = e => refWsClose.current(e);
    const cbError = e => refWsError.current(e);

    ws.addEventListener('open', cbOpen);
    ws.addEventListener('close', cbClose);
    ws.addEventListener('error', cbError);
    ws.addEventListener('message', cbMessage);
    
    return () => {
      unbind();
      ws.removeEventListener('open', cbOpen);
      ws.removeEventListener('close', cbClose);
      ws.removeEventListener('error', cbError);
      ws.removeEventListener('message', cbMessage);
    }
  }, [ setWs, connecting, setConnecting, gameId, ws, refWsOpen, refWsMessage, refWsClose, refWsError ]);

  return <GlobalContext.Provider value={{ ws: connecting, name, gameId, peers, setPeers }}>
      <MediaAgent/>    
      { /* <PingPong/> */ }
      <div className="Table">
        <Activities/>
        <Trade/>
        <div className="Game">
          <div className="Dialogs">
            { error && <div className="ErrorDialog">
              <Paper className="Error">
                <div>{ error }</div>
                <Button onClick={() => { setError("")}}>dismiss</Button>
              </Paper>
            </div> }
            { warning && <div className="WarningDialog">
              <Paper className="Warning">{ warning }</Paper>
            </div> }
            { state === 'normal' && <SelectPlayer/> }
            { color && state === 'game-order' && <GameOrder/> }
            <Winner/>
            <ViewCard {...{cardActive, setCardActive }}/>
            <ChooseCard/>
          </div>
         
          <Board/>          
          <PlayersStatus/>
          <PlayersStatus active={true}/>
          <Hand {...{buildActive, setBuildActive, setCardActive}}/>
        </div>
        <div className="Sidebar">
          { name !== "" && <PlayerList/> }
          { name !== "" && <Chat/> }
          { loaded && <Actions {...{buildActive, setBuildActive}}/> }
        </div>
      </div>
    </GlobalContext.Provider>;
};

const App = () => {
  const [playerId, setPlayerId] = useState(undefined);
  const [error, setError] = useState(undefined);

  useEffect(() => {
    if (playerId) {
      return;
    }
    window.fetch(`${base}/api/v1/games/`, {
      method: 'GET',
      cache: 'no-cache',
      credentials: 'same-origin', /* include cookies */
      headers: {
        'Content-Type': 'application/json'
      },
    }).then((res) => {
      if (res.status >= 400) {
        const error = `Unable to connect to Ketr Ketran game server! ` +
          `Try refreshing your browser in a few seconds.`;
        console.error(error);
        setError(error);
      }
      console.log(res.headers);
      return res.json();
    }).then((data) => {
      setPlayerId(data.player);
    }).catch((error) => {
    });
  }, [playerId, setPlayerId]);
  
  if (!playerId) {
    return <>{ error }</>;
  }

  return (
    <Router>
      <Routes>
        <Route exact element={<Table/>} path={`${base}/:gameId`}/>
        <Route exact element={<Table/>} path={`${base}`}/>
      </Routes>
    </Router>
  );
}

export default App;