using Godot;

namespace FOU.Scripts.Elements;

public abstract class Solid : Element {
    protected Solid(int x, int y, ref Chunk chunk) : base(x, y, chunk) {
        MarkForUpdate();
    }

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

        Tick();

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

    protected virtual void Tick() {
        Vector2I randomDirection = RandomDirectionDown();

        // fall speed reduction:
        if (GD.Randi() % MAX_DIFFUSE_SPEED > DiffuseSpeed) return; // descend slower

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

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

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

        // density check
        if (Chunk.Get(Position + Vector2I.Down)?.Density < Density)
            Chunk.Swap(this, Position + Vector2I.Down);
        else if (Chunk.Get(Position + Vector2I.Down + randomDirection)?.Density < Density)
            Chunk.Swap(this, Position + Vector2I.Down + randomDirection);
        else if (Chunk.Get(Position + Vector2I.Down + randomDirection * VERTICAL_OPPOSITE)?.Density < Density)
            Chunk.Swap(this, Position + Vector2I.Down + randomDirection * VERTICAL_OPPOSITE);
    }

}