if ('CGAL' in features):
	from yade import plot, polyhedra_utils, ymport, export
	frictionIn = 0.0
	densityIn = 3000.0
	youngIn = 1E10
	poissonIn = 0.3
	sizeB = 0.020
	odt = 0.00001
	vel = 0.01
	tolerance = 0.05
	startPos = sizeB

	def warningString(f_awaited, f_real, n_awaited, n_real):
		return str(
		        "The awaited force is %.4f, but obtained force is %.4f; number of bodies: %d vs %d! Iteration %d" %
		        (f_awaited, f_real, n_awaited, n_real, O.iter)
		)

	def printSuccess():
		print("Checkpoint: force values and number of bodies are OK! Iteration %d" % (O.iter))

	def checkForcesBodies(fR, bodNum):
		if (abs(f[2] - fR) / f[2] > tolerance or len(O.bodies) != bodNum):
			raise YadeCheckError(warningString(fR, f[2], bodNum, len(O.bodies)))
		else:
			printSuccess()

	mat1 = PolyhedraMat(density=densityIn, young=youngIn, poisson=poissonIn, frictionAngle=frictionIn, IsSplitable=True, strength=1)
	O.bodies.append(wall(0, axis=2, sense=1, material=mat1))

	x = 0.0000000001  # add some numerical noise to remove degenerate cases
	y = 0.000000001
	z = 0.0000000005
	vertices = [
	        [0 + x, 0 + y, 0 + z], [sizeB - x, 0 - y, 0 - z], [sizeB + x, sizeB + y, 0 - z], [sizeB + x, sizeB - y, sizeB + z], [0 - x, sizeB + y, 0 + z],
	        [0 - x, sizeB - y, sizeB + z], [0 + x, 0 - y, sizeB - z], [sizeB - x, 0 + y, sizeB - z]
	]
	t = polyhedra_utils.polyhedra(mat1, v=vertices)
	t.state.pos = (0, 0, sizeB / 2)
	O.bodies.append(t)

	topmesh = O.bodies.append(geom.facetBox((0., 0., startPos), (sizeB, sizeB, 0.), material=mat1))

	O.engines = [
	        ForceResetter(),
	        InsertionSortCollider([Bo1_Polyhedra_Aabb(), Bo1_Wall_Aabb(), Bo1_Facet_Aabb()], verletDist=.05 * sizeB),
	        InteractionLoop(
	                [Ig2_Facet_Polyhedra_PolyhedraGeom(),
	                 Ig2_Wall_Polyhedra_PolyhedraGeom(),
	                 Ig2_Polyhedra_Polyhedra_PolyhedraGeom()], [Ip2_PolyhedraMat_PolyhedraMat_PolyhedraPhys()],
	                [Law2_PolyhedraGeom_PolyhedraPhys_Volumetric()]
	        ),
	        NewtonIntegrator(damping=0.8, gravity=(0, 0, -9.81)),
	        PolyhedraSplitter(iterPeriod=1, label='Splitter'),
	        TranslationEngine(translationAxis=[0, 0, -1], velocity=vel, ids=topmesh, label='Tr'),
	        PyRunner(command='addPlotData()', iterPeriod=10),
	]

	O.dt = odt

	f = Vector3.Zero

	def addPlotData():
		global f
		f = Vector3.Zero
		for i in topmesh:
			if (O.forces.f(i)):
				f += O.forces.f(i)

#   from yade import qt
#   qt.Controller()
#   V = qt.View()

	import yade.libVersions

	cgalVer = yade.libVersions.getVersion('cgal')

	if (cgalVer > (4, 9, 0) and cgalVer < (5, 1, 1)):
		print("CGAL version is ", cgalVer, ". Will test for (cgal version > 4.9) and (cgal version < 5.1.1)")
		O.run(166, True)
		# number of bodies depends on precision used.
		if (yade.config.highPrecisionDecimalPlaces < 18 or yade.config.highPrecisionDecimalPlaces > 33):
			checkForcesBodies(-21.7037, 7)
		else:
			checkForcesBodies(-21.7037, 10)
	else:
		print("CGAL version is ", cgalVer, ". Will test for (cgal version <= 4.9) or (cgal version >= 5.1.1)")
		O.run(250, True)
		checkForcesBodies(25.44893, 4)
		O.run(50, True)
		checkForcesBodies(28.791353, 4)
		O.run(10, True)
		checkForcesBodies(30.731547, 4)
		O.run(20, True)
		checkForcesBodies(33.483438, 7)

else:
	print("This checkPolyhedraCrush.py cannot be executed because CGAL is disabled")
