Godot-SpaceShooter/Scripts/GameManager.cs

using Godot;
using Godot.Collections;

namespace Scripts;

public partial class GameManager : Node {
    [Export] private Array<PackedScene> asteroids;

    private float spawnTimer;

    [Export] private RichTextLabel labelAsteroids;
    [Export] private RichTextLabel labelLifes;
    [Export] private RichTextLabel labelPoints;
    [Export] private RichTextLabel labelLevel;
    [Export] private RichTextLabel labelNextLevel;
    [Export] private Node3D asteroidsContainer;

    public int AsteroidNumber {
        get => asteroidNumber;
        set {
            asteroidNumber = value;
            RefreshUi();
        }
    }

    public int Lives {
        get => lives;
        set {
            lives = value;
            if (lives <= 0) GameOver();
            RefreshUi();
        }
    }

    public int Points {
        get => points;
        set {
            points = value;
            if (points >= nextLevelPoints) NextLevel();
            RefreshUi();
        }
    }

    public int Level {
        get => level;
        private set {
            level = value;
            RefreshUi();
        }
    }

    private int NextLevelPoints {
        get => nextLevelPoints;
        set {
            nextLevelPoints = value;
            RefreshUi();
        }
    }

    private int AsteroidMaxNumber {
        get => asteroidMaxNumber;
        set {
            asteroidMaxNumber = value;
            RefreshUi();
        }
    }
    
    private int asteroidMaxNumber = 3;
    private int lives = 10;
    private int points;
    private int nextLevelPoints = 11;
    private int level = 1;
    private int asteroidNumber;
    private float spawnRate = 1f;

    public static GameManager Instance { get; private set; }


    public override void _Ready() {
        Instance = this;
        spawnTimer = spawnRate;
        RefreshUi();
    }

    public override void _Process(double delta) {
        spawnTimer -= (float)delta;
        if (spawnTimer < 0) {
            if (AsteroidNumber < asteroidMaxNumber) SpawnNewAsteroid();
            spawnTimer = spawnRate;
        }
    }

    private void SpawnNewAsteroid() {
        GD.Print("Spawn new asteroid");
        AsteroidNumber++;
        Node asteroid = asteroids.PickRandom().Instantiate();
        asteroidsContainer.AddChild(asteroid);
        asteroid.Name = $"Asteroid{AsteroidNumber}";
    }

    private void RefreshUi() {
        labelLifes.Text = $"Lives: {lives}";
        labelAsteroids.Text = $"Asteroids: {asteroidNumber} / {asteroidMaxNumber}";
        labelPoints.Text = $"Points: {points}";
        labelNextLevel.Text = $"Next Level at: {NextLevelPoints}";
        labelLevel.Text = $"Actual Level: {Level}";
    }

    private static void GameOver() => GD.Print("GAME OVER!");

    private void NextLevel() {
        GD.Print("Next Level!");
        Level++;
        NextLevelPoints = Level * 11;
        AsteroidMaxNumber = 3 + Level;
        spawnRate = 1f - Level * 0.1f;
    }

    public void OnGameAreaBodyExited(Node body) => GD.Print($"{body.Name} leaved GameArea!");
}