class BoxDomain:
    def __init__(self):
        pass
    
    def init_mesh(self):
        pass
    
    def define_displacement(self):
        pass
    
    def define_strain(self):
        pass
    
    def define_stress(self):
        pass
    
    def define_source(self):
        pass
    
    def define_Dirichlet_BC(self):
        pass
    
    def define_Neumann_BC(self):
        pass
    
    def is_on_Dirichlet_boundary(self):
        pass
    
    def is_on_Neumann_boundary(self):
        pass
    
    def is_on_fracture_boundary(self):
        pass

class IterationCounter:
    def __init__(self):
        pass

class FastSolver:
    def __init__(self):
        pass
    
    def preconditioning(self):
        pass
    
    def solve_system(self):
        pass

# Main code
box = BoxDomain()
box.init_mesh()
box.define_displacement()
box.define_strain()
box.define_stress()
box.define_source()
box.define_Dirichlet_BC()
box.define_Neumann_BC()

solution_function = box.solve_system()
stiffness_matrix = box.compute_stiffness_matrix()
elasticity_matrix = box.compute_elasticity_matrix()
source_vector = box.compute_source_vector()

print(stiffness_matrix.shape)

fast_solver = FastSolver()
fast_solver.preconditioning()
start_time = time.time()
fast_solver.solve_system()
end_time = time.time()
print("Time taken to solve the system:", end_time - start_time)

plot_original_mesh()