3. First Player Selected

 1<?php ...
 2 
 3namespace Thunk\Verbs\Examples\Monopoly\Events\Setup;
 4 
 5use Thunk\Verbs\Attributes\Autodiscovery\AppliesToState;
 6use Thunk\Verbs\Event;
 7use Thunk\Verbs\Examples\Monopoly\States\GameState; 
 8 
 9#[AppliesToState(GameState::class)]
10class FirstPlayerSelected extends Event
11{
12    public function __construct(
13        public int $game_id,
14        public int $player_id,
15    ) {}
16 
17    public function validateGame(GameState $game)
18    {
19        $this->assert($game->activePlayer() === null, 'A player has already been selected.');
20        $this->assert($game->hasPlayer($this->player_id), 'This player is not part of the game.');
21    }
22 
23    public function applyToGame(GameState $game)
24    {
25        $game->active_player_id = $this->player_id;
26    }
27}