using Godot;

namespace FOU.Scripts.Elements;

public class Water : Solid {
    public const int MAX_VERTICAL_SPREAD = 3;

    public Water(int x, int y, ref Level level) : base(x, y, ref level) {
        Color = AddColorVariance(Colors.Blue);
        Density = 1;
    }

    public override bool Update(int currentFrame) {
        if (!base.Update(currentFrame)) return false;

        Tick();

        return true; // not necessarily end, subclasses could do some more things
    }

    protected override void Tick() {
        Vector2I randomDirection = RandomDirectionDown();
        if (randomDirection.Y != 0)
            randomDirection *= Vector2I.Left * (int)(GD.Randi() % MAX_VERTICAL_SPREAD);

        if (Level.IsEmpty(Position + Vector2I.Down))
            Level.Swap(this, Position + Vector2I.Down);

        else if (Level.IsEmpty(Position + randomDirection))
            Level.Swap(this, Position + Vector2I.Right * randomDirection);

        else if (Level.IsEmpty(Position + randomDirection))
            Level.Swap(this, Position + Vector2I.Right * randomDirection * VERTICAL_OPPOSITE);
    }
}