MNG-95 Add GameHandler class (#14)

* Add GameHandler class

* Fix GameHandler class and add tests

* Fix tests

src/__tests__/gameHandlerClass.spec.ts

@@ -0,0 +1,102 @@
+import { GameHandler } from "../gameHandlerClass";
+import { Player } from "../playerClass";
+import { PokemonFactory } from "../pokemonFactory";
+import { PokemonType } from "../pokemonClass";
+import * as data from "../../assets/poke_data.json";
+
+describe("Test Game Handler class", () => {
+
+  const pokeData = data.pokemons;
+  const getPlayerOne = (factory: PokemonFactory) => {
+    return new Player("Wojtek", [
+      factory.getPokemonByName("bulbasaur"),
+      factory.getPokemonByName("charmander"),
+      factory.getPokemonByName("pikachu"),
+    ]);
+  } 
+
+  const getPlayerTwo = (factory: PokemonFactory) => {
+    return new Player("Wojtek", [
+      factory.getPokemonByName("bulbasaur"),
+      factory.getPokemonByName("charmander"),
+      factory.getPokemonByName("pikachu"),
+    ]);
+  }
+
+  it("GameHandler.isGameFinished should return false if every player has at least one pokemon", () => {
+    // Given
+    const factory = new PokemonFactory(pokeData);
+    const playerOne = getPlayerOne(factory);
+    const playerTwo = getPlayerTwo(factory);
+    const gameHandler = new GameHandler(playerOne, playerTwo);
+
+    // When
+    const isGameFinished = gameHandler.isGameFinished();
+
+    // Then
+    expect(isGameFinished).toBe(false);
+  });
+
+  it("GameHandler.isGameFinished should return true if all pokemons of one player are dead", () => {
+    // Given
+    const factory = new PokemonFactory(pokeData);
+    const playerOne = getPlayerOne(factory);
+    const playerTwo = getPlayerTwo(factory)
+    const gameHandler = new GameHandler(playerOne, playerTwo);
+
+    // When
+    playerOne.pokemons.forEach((pokemon) =>
+    pokemon.subtractHP(pokemon.maxHP));
+    const isGameFinished = gameHandler.isGameFinished();
+
+    // Then
+    expect(isGameFinished).toBe(true);
+  });
+  it("GameHandler.isGameFinished should return false if only some pokemons of a player are dead", () => {
+    // Given
+    const factory = new PokemonFactory(pokeData);
+    const playerOne = getPlayerOne(factory);
+    const playerTwo = getPlayerTwo(factory)
+    const gameHandler = new GameHandler(playerOne, playerTwo);
+
+    // When
+    playerTwo.pokemons[1].subtractHP(playerTwo.pokemons[1].maxHP)
+    const isGameFinished = gameHandler.isGameFinished();
+
+    // Then
+    expect(isGameFinished).toBe(false);
+  });
+  it("GameHandler.getWinner should return an error if the game is not finished", () => {
+    // Given
+    const factory = new PokemonFactory(pokeData);
+    const playerOne = getPlayerOne(factory);
+    const playerTwo = getPlayerTwo(factory)
+    const gameHandler = new GameHandler(playerOne, playerTwo);
+
+    // When
+    const winner = () =>
+      gameHandler.getWinner();
+
+    // Then
+    expect(winner).toThrowError(
+      "You cannot get the winner. The game is not over."
+    );
+  });
+  it("GameHandler.getWinner should return the winner if the game is finished", () => {
+    // Given
+    const factory = new PokemonFactory(pokeData);
+    const playerOne = getPlayerOne(factory);
+    const playerTwo = getPlayerTwo(factory)
+    const gameHandler = new GameHandler(playerOne, playerTwo);
+
+
+    // When
+    playerTwo.pokemons.forEach((pokemon) =>
+    pokemon.subtractHP(pokemon.maxHP));
+    const winner = gameHandler.getWinner();
+
+    // Then
+    expect(winner).toStrictEqual(playerOne);
+  });
+});
+

src/gameHandlerClass.ts

@@ -0,0 +1,38 @@
+import { Player } from "./playerClass";
+
+export class GameHandler {
+  constructor(
+    private readonly _playerOne: Player,
+    private readonly _playerTwo: Player
+  ) {}
+
+  _currentPlayer: Player = this._playerOne;
+
+  getCurrentPlayer(): Player {
+    return this._currentPlayer;
+  }
+
+  getOpponentPlayer(): Player {
+    if (this._currentPlayer === this._playerOne) return this._playerTwo;
+    return this._playerOne;
+  }
+
+  private didPlayerLoose(player: Player): boolean {
+    return player.alivePokemons.length === 0;
+  }
+
+  isGameFinished(): boolean {
+    return (
+      this.didPlayerLoose(this._playerOne) ||
+      this.didPlayerLoose(this._playerTwo)
+    );
+  }
+
+  getWinner(): Player | Error {
+    if (!this.isGameFinished())
+      throw new Error("You cannot get the winner. The game is not over.");
+    return this.didPlayerLoose(this._playerOne) === true
+      ? this._playerTwo
+      : this._playerOne;
+  }
+}

src/pokemonClass.ts

@@ -50,6 +50,10 @@ export class Pokemon {
     return this._currentHP;
   }
 
+  get maxHP() {
+    return this._maxHP;
+  }
+
   subtractHP(pointsToSubtract: number): void {
     const newHP = this._currentHP - pointsToSubtract;
     if (newHP < 0) {