import { PRNG } from 'seedrandom';
import {EventEmitter} from 'events';
import { Board } from "./entities/Board";
import { PlayerMove } from "./entities/PlayerMove";
import { PlayerInterface } from "./entities/player/PlayerInterface";
import { Tile } from "./entities/Tile";
import { LoggingService } from "../common/LoggingService";
import { printBoard, printLine, uuid, whileNot } from '../common/utilities';
import { PlayerNotificationService } from '../server/services/PlayerNotificationService';
import { GameState } from './dto/GameState';
import { PlayerHuman } from './entities/player/PlayerHuman';
import { PlayerAI } from './entities/player/PlayerAI';
import { GameSummary } from './dto/GameSummary';

export class DominoesGame extends EventEmitter {
  private id: string;
  private seed: string | undefined;
  autoDeal: boolean = true;
  board: Board;
  currentPlayerIndex: number = 0;
  gameInProgress: boolean = false;
  gameOver: boolean = false;
  gameBlocked: boolean = false;
  gameTied: boolean = false;
  tileSelectionPhase: boolean = true;
  logger: LoggingService = new LoggingService();
  blockedCount: number = 0;
  winner: PlayerInterface | null = null;
  rng: PRNG;
  handSize: number = 7;
  notificationService: PlayerNotificationService = new PlayerNotificationService();
  lastMove: PlayerMove | null = null;
  forcedInitialPlayerIndex: number | null = null;
  canAskNextPlayerMove: boolean = true;
  clientsReady: string[] = [];

  constructor(public players: PlayerInterface[], seed: PRNG) {
    super();
    this.id = uuid();
    this.logger.info(`Game ID: ${this.id}`);
    this.rng = seed
    this.board = new Board(seed);
    this.initializeGame();
  }

  get numHumanPlayers() {
    return this.players.filter(player => player instanceof PlayerHuman).length;
  }

  async initializeGame() {
    this.gameOver = false;
    this.gameBlocked = false;
    this.gameTied = false;
    this.board.boneyard = this.generateTiles();
  }

  setForcedInitialPlayerIndex(index: number) {
    this.forcedInitialPlayerIndex = index;
  }

  reset() {
    this.board.reset();
    this.initializeGame();
    for (let player of this.players) {
      player.hand = [];
    }
  }

  generateTiles(): Tile[] {
    const tiles: Tile[] = [];
    for (let i = 6; i >= 0; i--) {
      for (let j = i; j >= 0; j--) {
        tiles.push(new Tile([i, j]));
      }
    }
    this.logger.debug('tiles :>> ' + tiles);
    return this.shuffle(tiles);
  }

  private shuffle(array: Tile[]): Tile[] {
    for (let i = array.length - 1; i > 0; i--) {
      const j = Math.floor(this.rng() * (i + 1));
      [array[i], array[j]] = [array[j], array[i]];
    }
    return array;
  }  

  nextPlayer() {
    this.logger.debug('Turn ended');
    this.currentPlayerIndex = (this.currentPlayerIndex + 1) % this.players.length;
  }

  isBlocked(): boolean {
    const freeEnds = this.board.getFreeEnds();
    const tiles = []
    for (let player of this.players) {
      tiles.push(...player.hand);
    }
    const canPlay = tiles.some(tile => tile.pips[0] === freeEnds[0] || tile.pips[1] === freeEnds[0] || tile.pips[0] === freeEnds[1] || tile.pips[1] === freeEnds[1]);
    return  this.blockedCount >= 4 && !canPlay;
  }

  isGameOver(): boolean {
    const hasWinner: boolean = this.players.some(player => player.hand.length === 0);
    return hasWinner || this.gameBlocked;
  }

  getWinner(): PlayerInterface {
    const winnerNoTiles = this.players.find(player => player.hand.length === 0);
    if (winnerNoTiles !== undefined) {
      return winnerNoTiles;
    }
    const winnerMinPipsCount = this.players.reduce((acc, player) => {
      return player.pipsCount() < acc.pipsCount() ? player : acc;
    });
    return winnerMinPipsCount;
  }

  getStartingPlayerIndex(): number {
    // Determine starting player
    let startingIndex = this.players.findIndex(player => player.hand.some(tile => tile.pips[0] === 6 && tile.pips[1] === 6));
    if (startingIndex === -1) {
      startingIndex = this.players.findIndex(player => player.hand.some(tile => tile.pips[0] === 5 && tile.pips[1] === 5));
      if (startingIndex === -1) {
        startingIndex = this.players.findIndex(player => player.hand.some(tile => tile.pips[0] === 4 && tile.pips[1] === 4));
        if (startingIndex === -1) {
          startingIndex = this.players.findIndex(player => player.hand.some(tile => tile.pips[0] === 3 && tile.pips[1] === 3));
          if (startingIndex === -1) {
            startingIndex = this.players.findIndex(player => player.hand.some(tile => tile.pips[0] === 2 && tile.pips[1] === 2));
            if (startingIndex === -1) {
              startingIndex = this.players.findIndex(player => player.hand.some(tile => tile.pips[0] === 1 && tile.pips[1] === 1));
              if (startingIndex === -1) {
                startingIndex = this.players.findIndex(player => player.hand.some(tile => tile.pips[0] === 0 && tile.pips[1] === 0));
              }
            }
          }
        }
      }
    }
    this.logger.debug('Starting player index: ' + startingIndex);
    return startingIndex === -1 ? 0 : startingIndex;
  }

  playTurn() {
    try {
      const player = this.players[this.currentPlayerIndex];
      this.notificationService.sendEventToPlayers('server:next-turn', this.players, this.getState());
      this.logger.debug(`${player.name}'s turn (${player.hand.length} tiles)`);
      this.printPlayerHand(player);
      printBoard(this.board)
      player.askForMove(this.board);   
    } catch (error) {
      this.logger.error(error, 'Error playing turn');
    }
  }

  async checkAllClientsReadyToContinue() {
    try {
      const conditionFn = () => {
        this.logger.trace(`Clients ready: ${this.clientsReady.length}/${this.numHumanPlayers}`);
        return this.clientsReady.length === this.numHumanPlayers   
      }
      await whileNot(conditionFn, 100);
      this.clientsReady = [];
    } catch (error) {
      this.logger.error(error, 'Error starting game');
      throw new Error('Error starting game (checkAllClientsReadyToContinue)');
    }
  }

  async finishTurn(playerMove: PlayerMove | null) {
    try {
      this.lastMove = playerMove;
      if (playerMove === null) {
        this.logger.info('Player cannot move');
        this.blockedCount += 1;
        this.logger.trace(`Blocked count: ${this.blockedCount}`);
        this.gameBlocked = this.isBlocked();
        this.notificationService.sendEventToPlayers('server:server-player-move', this.players, { move: playerMove });
        if (this.gameBlocked) {
          this.gameEnded();
        } else {
          this.nextPlayer();
          await this.checkAllClientsReadyToContinue()
          this.playTurn();
        }
        return;
      }
      const player = this.players[this.currentPlayerIndex];
      const skipWaitForConfirmation = player instanceof PlayerAI && playerMove === null;
      this.blockedCount = 0;
      this.board.play(playerMove);
      player.hand = player.hand.filter(tile => tile !== playerMove.tile);
      this.notificationService.sendEventToPlayers('server:server-player-move', this.players, { move: playerMove });
      this.canAskNextPlayerMove = false;
      // whileNotUndefined(() => this.canAskNextPlayerMove === true ? {} : undefined);
      this.gameOver = this.isGameOver();
      if (!this.gameOver) {
        this.nextPlayer();  
        if (!skipWaitForConfirmation) {
          await this.checkAllClientsReadyToContinue()  
        }
        this.playTurn();
      } else {
        this.gameEnded();
      }
    } catch (error) {
      this.logger.error(error, 'Error finishing move');
    }
  }

  gameEnded() {
    this.gameInProgress = false;
    this.winner =  this.getWinner();
    this.setScores();
    const summary: GameSummary = {
      gameId: this.id,
      isBlocked: this.gameBlocked,
      isTied: this.gameTied,
      winner: this.winner?.getState(true),
      score: this.players.map(player => ({id: player.id, name: player.name, score: player.score})),
      players: this.players.map(player => player.getState(true)),
      board: this.board.tiles.map(tile => tile.getState(true)),
      boneyard: this.board.boneyard.map(tile => tile.getState(true)),
      movements: this.board.movements
    }
    this.emit('game-over', summary);
  }

  resetPlayersScore() {
    for (let player of this.players) {
      player.score = 0;
    }
  }

  setCanAskNextPlayerMove(value: boolean) {
    this.canAskNextPlayerMove = value
  }

  private deal() {
    if (this.autoDeal) {
      this.autoDealTiles();
    } else  {
      // await this.tilesSelection();
    }
    this.printPlayersHand();
  }

  printPlayersHand() {
    for (let player of this.players) {
      this.printPlayerHand(player);
    }    
  }

  printPlayerHand(player: PlayerInterface) {
    this.logger.debug(`${player.name}'s hand (${player.hand.length}): ${player.hand.map(tile => tile.toString())}`);
  }

  async start(): Promise<void> {
    try {
      // Initalize game
      this.gameInProgress = false;
      this.resetPlayersScore();
      this.tileSelectionPhase = true;
      this.deal();
      const extractStates =  (p: PlayerInterface) => ({
        player:  p.getState(true),
        gameState: this.getState()
      });
      await this.notificationService.sendEventToPlayers('server:hand-dealt', this.players, extractStates);
      
      this.tileSelectionPhase = false;

      // Start game
      this.gameInProgress = true;
      this.currentPlayerIndex = (this.forcedInitialPlayerIndex !== null) ? this.forcedInitialPlayerIndex : this.getStartingPlayerIndex();

      printLine(`${this.players[this.currentPlayerIndex].name} is the starting player:`);
      this.logger.debug("Before play turn")
      this.playTurn();
    } catch (error) {
      this.logger.error(error, 'Error starting game');
      throw new Error('Error starting game');
    }
  }

  setScores() {
    const totalPips = this.players.reduce((acc, player) => acc + player.pipsCount(), 0) || 0;
    if (this.winner !== null) {
      const winner = this.winner;
      winner.score = totalPips;
      if (winner.teamedWith !== undefined) {
        const p = this.getPlayer(winner.teamedWith)
        if (p !== undefined) {
          p.score = totalPips;
        }
      }
    }
  }

  private getPlayer(userId: string) {
    return this.players.find(player => player.id === userId) || undefined;
  }

  private autoDealTiles() {
    for (let i = 0; i < this.handSize; i++) {
      for (let player of this.players) {
        const tile: Tile | undefined = this.board.boneyard.pop();
        if (tile !== undefined) {
          tile.revealed = true;
          tile.playerId = player.id;
          player.hand.push(tile);
        }
      }
    }
  }

  private async tilesSelection() {
    while (this.board.boneyard.length > 0) {
      for (let player of this.players) {
        const choosen = await player.chooseTile(this.board);
        if (this.board.boneyard.length === 0) {
          break;
        }
      }
    }
  }

  getState(): GameState {
    const currentPlayer = this.players[this.currentPlayerIndex]
    const lastMove = this.lastMove?.getState() || null;
    const movements = this.board.movements.map(move => move.getState());
    
    return {
      id: uuid(),
      lastMove,
      gameInProgress: this.gameInProgress,
      winner: this.winner,
      tileSelectionPhase: this.tileSelectionPhase, 
      gameBlocked: this.gameBlocked,
      gameTied: this.gameTied,
      gameId: this.id,
      boneyard: this.board.boneyard.map(tile => tile.getState(false)),
      players: this.players.map(player => player.getState(false)),
      currentPlayer: currentPlayer.getState(),
      board: this.board.tiles.map(tile => tile.getState(true)),
      boardFreeEnds: this.board.getFreeEnds(),
      movements
    }

  }

  setClientReady(userId: string) {
    this.logger.trace(`${userId} - ${this.clientsReady}`);
    if (!this.clientsReady.includes(userId)) {
      this.logger.trace(`Client ${userId} is ready`)
      this.clientsReady.push(userId);
    }
  }


}