import React, { useState, useEffect, useContext, useRef, useMemo, useCallback } from "react";
import equal from "fast-deep-equal";

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

import "./Winner.css";

import {Resource} from './Resource.js';
import {PlayerColor} from './PlayerColor.js';
import { GlobalContext } from "./GlobalContext.js";

const Winner = ({ winnerDismissed, setWinnerDismissed }) => {
  const { ws } = useContext(GlobalContext);
  const [winner, setWinner] = useState(undefined);
  const [state, setState] = useState(undefined);
  const fields = useMemo(() => [
    'winner', 'state'
  ], []);
  const onWsMessage = (event) => {
    const data = JSON.parse(event.data);
    switch (data.type) {
    case 'game-update':
      console.log(`winner - game update`, data.update);
      if ('winner' in data.update && !equal(data.update.winner, winner)) {
        setWinner(data.update.winner);
      }
      if ('state' in data.update && data.update.state !== state) {
        if (data.update.state !== 'winner') {
          setWinner(undefined);
        }
        setWinnerDismissed(false);
        setState(data.update.state);
      }
      break;
    default:
      break;
    }
  };
  const refWsMessage = useRef(onWsMessage);
  useEffect(() => { refWsMessage.current = onWsMessage; });
  useEffect(() => {
    if (!ws) { return; }
    const cbMessage = e => refWsMessage.current(e);
    ws.addEventListener('message', cbMessage);
    return () => {
      ws.removeEventListener('message', cbMessage);
    }
  }, [ws, refWsMessage]);
  useEffect(() => {
    if (!ws) { return; }
    ws.send(JSON.stringify({ 
      type: 'get', 
      fields
    }));
  }, [ws, fields]);

  const quitClicked = useCallback((event) => {
    if (!winnerDismissed) {
      setWinnerDismissed(true);
      ws.send(JSON.stringify({
        type: 'goto-lobby'
      }));
    }
  }, [ws, winnerDismissed, setWinnerDismissed]);

  if (!winner || winnerDismissed) {
    return <></>;
  }

  let losers = [];
  for (let key in winner.players) {
    if (key === winner.color || winner.players[key].status === 'Not active') {
      continue;
    }
    losers.push(winner.players[key]);
  }

  const turnCount = Math.floor(winner.turns / (losers.length + 1));

  losers = losers.map(player => {
    const averageSeconds = Math.floor(player.totalTime / turnCount / 1000),
      average = `${Math.floor(averageSeconds / 60)}m:${averageSeconds % 60}s`;
    return <div key={player.color}>
      <PlayerColor color={player.color}/> {player.name} finished with {player.points} victory points.
      { Number(player.potential) !== 0 && <>They had <b>{player.potential}</b> unplayed Victory Point card(s).</> }
      Their average turn time was {average}.
    </div>;
  });

  let robber;
  let max = 0;

  let playerStolen = {};
  const stats = winner.stolen;
  for (let player in stats) {
    if (player === 'total' || player === 'player') {
      continue;
    }
    if (player === 'robber') {
      robber = <></>;
      for (let type in stats.robber.stole) {
        if (type === 'total') {
          continue;
        }
        const count = stats.robber.stole[type];
        robber = <>{robber}
          <Resource label={true} type={type} count={count} disabled/>
        </>;
      }
      robber = <div>
        Throughout the game, the robber blocked <b>{stats.robber.stole.total}
        </b> resources:
        <div className="ThiefStole">{robber}</div></div>;
      continue;
    }

    if ( stats[player].stolen.total < max) {
      continue;
    }
    if (stats[player].stolen.total > max) {
      max = stats[player].stolen.total;
      playerStolen = {
        robber: stats[player].stolen.robber,
        player: stats[player].stolen.player,
        element: <></>
      };
    }

    let stolen;
    for (let type in stats[player].stolen) {
      if ([ 'total', 'robber', 'player' ].indexOf(type) !== -1) {
        continue;
      }
      if (!stolen) {
        stolen = <></>;
      }
      const count = stats[player].stolen[type];
      stolen = <>{stolen}
        <Resource label={true} type={type} count={count} disabled/>
      </>;
    }
    if (stolen) {
      playerStolen.element = <div key={player}>
        <PlayerColor color={player}/> {winner.players[player].name} 
        <div className="PlayerStolen">{stolen}</div>
      </div>;
    }
  }
  
  if (!robber) {
    robber = <div>The robber never blocked any resources from anyone!</div>;
  }

  const averageSeconds = Math.floor(winner.totalTime / turnCount / 1000),
    average = `${Math.floor(averageSeconds / 60)}m:${averageSeconds % 60}s`;

  const seconds = winner.elapsedTime / 1000,
    h = Math.floor(seconds / (60 * 60)),
    m = Math.floor((seconds % (60 * 60)) / 60),
    s = Math.floor((seconds % (60 * 60)) % 60);
  const totalTime = `${h}h:${m}m:${s}s`;

  let vpType = ['market', 'university', 'library', 'palace'];
  vpType = vpType[Math.floor(vpType.length * Math.random())];

  return (
    <div className="Winner">
      <Paper>
        <div className="Title">{winner.name} has won with {winner.points} victory points!</div>
        <div style={{display: 'flex', flexDirection: 'row'}}>
          <Resource type={`vp-${vpType}`} disabled count={1}/>
          <div className="Description">
          <div>Congratulations, <b>{winner.name}</b>!</div>
          <div>
            <PlayerColor color={winner.color}/> {winner.name} won the game 
              with <b>{winner.points}</b> Victory Points after {turnCount} game turns.
              { Number(winner.potential) !== 0 && <>They had <b>{winner.potential}</b> unplayed Victory Point card(s).</>}
              Their average turn time was {average}.
          </div>
          { losers }
          <div>The game took {totalTime}.</div>
          { robber }
          { max !== 0 && <>
            <div>The robber stole {playerStolen.robber} and other players
            stole {playerStolen.player} resources from:</div> 
            <div className="PlayerStolenList">
              { playerStolen.element }
            </div>
          </> }
          </div>
        </div>
        <Button onClick={quitClicked}>Go back to Lobby</Button>
      </Paper>
    </div>
  );
};

export { Winner };