Example Game Manager Class

with explanations

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4 min read

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Aug 29, 2023

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using System;
using UnityEngine;

/// <summary>
/// Nice, easy to understand enum-based game manager. For larger and more complex games, look into
/// state machines. But this will serve just fine for most games.
/// </summary>
public class ExampleGameManager : StaticInstance<ExampleGameManager> {
    public static event Action<GameState> OnBeforeStateChanged;
    public static event Action<GameState> OnAfterStateChanged;

    public GameState State { get; private set; }

    // Kick the game off with the first state
    void Start() => ChangeState(GameState.Starting);

    public void ChangeState(GameState newState) {
        OnBeforeStateChanged?.Invoke(newState);

        State = newState;
        switch (newState) {
            case GameState.Starting:
                HandleStarting();
                break;
            case GameState.SpawningHeroes:
                HandleSpawningHeroes();
                break;
            case GameState.SpawningEnemies:
                HandleSpawningEnemies();
                break;
            case GameState.HeroTurn:
                HandleHeroTurn();
                break;
            case GameState.EnemyTurn:
                break;
            case GameState.Win:
                break;
            case GameState.Lose:
                break;
            default:
                throw new ArgumentOutOfRangeException(nameof(newState), newState, null);
        }

        OnAfterStateChanged?.Invoke(newState);
        
        Debug.Log($"New state: {newState}");
    }

    private void…