import { EventProcessor, IEventProcessor } from "../utils/event_processor.js";

import { GameStartedEvent } from "../game/events/game_started_event.js";
import { PlayerJoinedEvent } from "../game/events/player_joined_event.js";
import { PlayerRolledEvent } from "../game/events/player_rolled_event.js";

import { Game } from "../game/game.js";
import { Board } from "../game/board.js";
import { Player } from "../game/player.js";

import { MaxPlayersExceededError } from "./errors/max_players_exceeded_error.js";
import { GameNotStartedError } from "./errors/game_not_started_error.js";
import { DuplicateGameError } from "./errors/duplicate_game_error.js";
import { TournamentIncompleteError } from "./errors/tournament_incomplete_error.js";

// Provide Tournament class with additional EventProcessor methods
export interface Tournament extends IEventProcessor {}

interface ITournamentOptions {
  maxPlayersPerGame: number;
}

@EventProcessor.watch
export class Tournament implements ITournamentOptions {
  gamesMap = new Map<number, Game>();
  playersMap = new Map<number, Player>();

  maxPlayersPerGame = 2;

  constructor(public board: Board, options: Partial<ITournamentOptions> = {}) {
    Object.assign(this, options);
  }

  get players() {
    return Array.from(this.playersMap.values());
  }

  get games() {
    return Array.from(this.gamesMap.values());
  }

  @EventProcessor.handle(GameStartedEvent)
  onGameStarted(gameStartedEvent: GameStartedEvent) {
    this.newGame(gameStartedEvent.gameId);
  }

  @EventProcessor.handle(PlayerJoinedEvent)
  onPlayerJoined(playerJoinedEvent: PlayerJoinedEvent) {
    const game = this.getGame(playerJoinedEvent.gameId);
    if (!game) {
      throw new GameNotStartedError(
        playerJoinedEvent.gameId,
        playerJoinedEvent.playerId
      );
    }

    const player = this.getOrCreatePlayer(playerJoinedEvent.playerId);

    if (game.playerCount >= this.maxPlayersPerGame) {
      throw new MaxPlayersExceededError(
        game.gameId,
        player.playerId,
        this.maxPlayersPerGame
      );
    }

    player.join(game);
    game.addPlayer(player);
  }

  @EventProcessor.handle(PlayerRolledEvent)
  onPlayerRolled(playerRolledEvent: PlayerRolledEvent) {
    const game = this.getGame(playerRolledEvent.gameId);
    if (!game) {
      throw new GameNotStartedError(
        playerRolledEvent.gameId,
        playerRolledEvent.playerId
      );
    }

    const player = this.getOrCreatePlayer(playerRolledEvent.playerId);
    player.rollDice(game, playerRolledEvent.roll);
  }

  getGame(gameId: number) {
    return this.gamesMap.get(gameId);
  }

  newGame(gameId: number) {
    if (this.gamesMap.has(gameId)) {
      throw new DuplicateGameError(gameId);
    }
    const game = new Game(gameId, this.board);
    this.gamesMap.set(gameId, game);
    return game;
  }

  getOrCreatePlayer(playerId: number) {
    let player = this.playersMap.get(playerId);
    if (!player) {
      player = new Player(playerId);
      this.playersMap.set(playerId, player);
    }
    return player;
  }

  requireCompletion() {
    const incompleteGameIds = Array.from(this.gamesMap.values())
      .filter((game: Game) => !game.isComplete)
      .map((game: Game) => game.gameId);

    if (incompleteGameIds.length) {
      throw new TournamentIncompleteError(incompleteGameIds);
    }
  }
}