using Godot;

public class Main : Node2D
{
    public override void _Ready()
    {
        GD.Randomize();
        InitializeParticles();
    }

    public override void _Process(float delta)
    {
        if (Input.IsActionJustPressed("quit")) GetTree().Quit();
        if (Input.IsActionJustPressed("reset")) GetTree().ReloadCurrentScene();
    }

    private void InitializeParticles()
    {
        var particleScene = GD.Load<PackedScene>("res://Particle.tscn");
        for (var i = 0; i < 50; i++)
        {
            var particle = particleScene.Instance<Particle>();
            GetNode<Node2D>("Particles").AddChild(particle);
            particle.Position = GetRandomParticlePosition();
            particle.Hue = (float) GD.RandRange(0, 1);
        }
    }

    private Vector2 GetRandomParticlePosition()
    {
        const int padding = 32;
        var viewportRect = GetViewportRect();
        var position = new Vector2((float) GD.RandRange(padding, viewportRect.Size.x - padding),
            (float) GD.RandRange(padding, viewportRect.Size.y - padding));
        return position;
    }
}