using Godot;

namespace FOU.Scripts.Elements;

public abstract class Liquid : Element {
    public const int MAX_VERTICAL_SPREAD = 3;

    protected Liquid(int x, int y, ref Chunk chunk) : base(x, y, chunk) { }

    public override bool Update() {
        if (!base.Update()) return false;
        if (lastMove + STEPS_UNTIL_INACTIVE < Engine.GetFramesDrawn()) Active = 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 (Chunk.IsEmpty(Position + Vector2I.Down))
            Chunk.Swap(this, Position + Vector2I.Down);

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

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