#include "gameplay.hpp"
#include "puzzle.hpp"
#include "FL/Fl_Group.H"

static bool is_next_to_empty_box(GameParams::coordinates empty_box_pos,
                                 GameParams::coordinates current_pos)
{
    return
        (current_pos.x - spacing - puzzle_size == empty_box_pos.x &&
         current_pos.y == empty_box_pos.y) ||
        (current_pos.x == empty_box_pos.x &&
         current_pos.y - spacing - puzzle_size == empty_box_pos.y) ||
        (current_pos.x + puzzle_size + spacing == empty_box_pos.x &&
         current_pos.y == empty_box_pos.y) ||
        (current_pos.x == empty_box_pos.x &&
         current_pos.y + puzzle_size + spacing == empty_box_pos.y);
}

void press_button_callback(Fl_Widget *w, void *params)
{
    GameParams *gp = reinterpret_cast<GameParams*>(params);
    GameParams::coordinates current_pos = { w->x(), w->y() };
    if(is_next_to_empty_box(gp->GetXYEmptyBox(), current_pos)) {
        w->position(gp->GetXYEmptyBox().x, gp->GetXYEmptyBox().y);
        gp->SetXYEmptyBox(current_pos.x, current_pos.y);
    }
    w->redraw();
    w->parent()->redraw();
}