import React from 'react';
import { getGoogleApiKey, createGame, gameInfo, joinGame, getGuesses, sendGuess } from "./services/ggsh.service";
import GamePanel from "./components/game-panel.component";
import ApiInfo from "./components/api-info.component";
import PlayerScores from "./components/player-scores.component";
import RoundSummary from './components/round-summary.component';
import PreGame from './components/pre-game.component';
import PreRound from './components/pre-round.component';
import './App.css';

const LOADING    = "LOADING";   // Application is loading
const PRE_GAME   = "PREGAME";   // Game is not yet started
const PRE_ROUND  = "PREROUND";  // Game is started or joined, but not playing yet
const IN_ROUND   = "INROUND";   // Actively playing
const POST_ROUND = "POSTROUND"; // Round has finished
const POST_GAME  = "POSTGAME";  // Game has finished
const ERROR      = "ERROR";     // Error state

class Game extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      googleApiKey: null,
      gameState: LOADING,
      playerName: null,
      gameId: null,
      currentRound: null,
      targetPoint: null,
      selectedPoint: null,
      lastScore: null,
      totalScore: null,
      players: null,
      roundTimer: null,
    }
  }

  // TODO error handling throughout - at the moment it assumes all calls always succeed

  async componentDidMount() {
    const googleApiKey = await getGoogleApiKey();
    this.setState({ googleApiKey, gameState: PRE_GAME });
  }

  async handleCreateGame() {
    this.setState({ gameState: LOADING });
    const { playerName } = this.state;
    const gameId = await createGame(playerName, 300);
    this.setState({ gameState: PRE_ROUND, gameId });
  }

  async handleJoinGame() {
    this.setState({ gameState: LOADING });
    const { gameId, playerName } = this.state;
    await joinGame(gameId, playerName);
    this.setState({ gameState: PRE_ROUND });
  }

  async updateRoundState() {
    this.setState({ gameState: LOADING })
    const { gameId, playerName } = this.state;
    const { currentRound } = await getGuesses(gameId, playerName);
    const { coords, players, timer } = await gameInfo(gameId);
    if (currentRound) {
      const targetPoint = coords[currentRound];
      this.setState({
        gameState: IN_ROUND,
        currentRound,
        targetPoint,
        selectedPoint: null,
        players,
        roundTimer: timer,
      });
    } else {
      this.setState({ gameState: POST_GAME, players });
    }
  }

  async handleSubmitGuess() {
    this.setState({ gameState: LOADING });
    const {
      gameId,
      playerName,
      currentRound,
      selectedPoint
    } = this.state;
    if (selectedPoint) {
      const { score, totalScore } = await sendGuess(gameId, playerName, currentRound, selectedPoint);
      this.setState({
        gameState: POST_ROUND,
        lastScore: score,
        totalScore
      });
    } else {
      const { score, totalScore } = await sendGuess(gameId, playerName, currentRound, { timeout: true });
      this.setState({
        gameState: POST_ROUND,
        lastScore: score,
        totalScore
      });
    }
  }

  render() {
    const {
      googleApiKey,
      gameState,
      gameId,
      playerName,
      targetPoint,
      selectedPoint,
    } = this.state;

    switch (gameState) {
      case LOADING:
        return <p>Loading...</p>
      case PRE_GAME:
        return <PreGame
          onCreateGame={() => this.handleCreateGame()}
          onJoinGame={() => this.handleJoinGame()}
          onChangeGameId={({ target }) => this.setState({gameId: target.value.trim()})}
          onChangePlayerName={({ target }) => this.setState({playerName: target.value.trim()})}
          gameId={gameId || ""}
          playerName={playerName || ""}
        />
      case PRE_ROUND:
        return <PreRound
          gameId={gameId}
          playerName={playerName}
          onStart={() => this.updateRoundState()}
        />
      case IN_ROUND:
        const { roundTimer } = this.state;
        return <GamePanel
          googleApiKey={googleApiKey}
          onSelectPoint={latLng => this.setState({selectedPoint: latLng})}
          onSubmitGuess={() => this.handleSubmitGuess()}
          streetViewPoint={targetPoint}
          selectedPoint={selectedPoint}
          roundSeconds={roundTimer}
          onTimeout={() => this.handleSubmitGuess()}
        />
      case POST_ROUND:
        const { currentRound, lastScore, totalScore } = this.state;
        return <RoundSummary
          googleApiKey={googleApiKey}
          roundNum={currentRound}
          score={lastScore}
          totalScore={totalScore}
          onAdvanceState={() => this.updateRoundState()}
          buttonText={currentRound === "5" ? "View Summary" : "Next Round"}
          selectedPoint={selectedPoint}
          targetPoint={targetPoint}
        />
      case POST_GAME:
        const { players } = this.state;
        return <PlayerScores
          players={players}
          onReturnToStart={() => this.setState({ gameState: PRE_GAME })}
        />
      case ERROR:
        return <p>Application encountered unrecoverable error, please refresh the page.</p>
      default:
        this.setState({ gameState: ERROR });
        return <p>Application state is inconsistent, please refresh and rejoin your previous game.</p>
    }
  }
}

const App = () => {
  return (
    <div className="App" style={{
      display: "flex",
      flexDirection: "column",
      justifyContent: "space-between",
      height: "100vh",
    }}>
      <div>
        <p>TerrAssumptions!</p>
        <hr/>
      </div>
      <Game style={{flex: 1}}/>
      <div>
        <hr/>
        <ApiInfo/>
      </div>
    </div>
  );
}

export default App;