#!/usr/bin/env python

import unittest

import numpy as np
import cv2 as cv
import os

class cuda_test(unittest.TestCase):
	"""Test Cuda-accelerated OpenCV functions class."""

	@unittest.skipIf(cv.cuda.getCudaEnabledDeviceCount() == 0, "No cuda device found")
	def test_cuda_upload_download(self):

		npMat = (np.random.random((128, 128, 3)) * 255).astype(np.uint8)
		cuMat = cv.cuda_GpuMat()
		cuMat.upload(npMat)

		self.assertTrue(np.allclose(cuMat.download(), npMat))

	@unittest.skipIf(cv.cuda.getCudaEnabledDeviceCount() == 0, "No cuda device found")	
	def test_cuda_upload_download_stream(self):

		stream = cv.cuda_Stream()
		npMat = (np.random.random((128, 128, 3)) * 255).astype(np.uint8)
		cuMat = cv.cuda_GpuMat(128,128, cv.CV_8UC3)
		cuMat.upload(npMat, stream)
		npMat2 = cuMat.download(stream=stream)
		stream.waitForCompletion()

		self.assertTrue(np.allclose(npMat2, npMat))

	@unittest.skipIf(cv.cuda.getCudaEnabledDeviceCount() == 0, "No cuda device found")
	def test_cuda_interop(self):

		npMat = (np.random.random((128, 128, 3)) * 255).astype(np.uint8)
		cuMat = cv.cuda_GpuMat()
		cuMat.upload(npMat)

		self.assertTrue(cuMat.cudaPtr() != 0)

		stream = cv.cuda_Stream()
		self.assertTrue(stream.cudaPtr() != 0)

		asyncstream = cv.cuda_Stream(1)  # cudaStreamNonBlocking
		self.assertTrue(asyncstream.cudaPtr() != 0)

	@unittest.skipIf(cv.cuda.getCudaEnabledDeviceCount() == 0, "No cuda device found")
	def test_cuda_buffer_pool(self):

		cv.cuda.setBufferPoolUsage(True)
		cv.cuda.setBufferPoolConfig(cv.cuda.getDevice(), 1024 * 1024 * 64, 2)
		stream_a = cv.cuda.Stream()
		pool_a = cv.cuda.BufferPool(stream_a)
		cuMat = pool_a.getBuffer(1024, 1024, cv.CV_8UC3)
		cv.cuda.setBufferPoolUsage(False)

		self.assertEqual(cuMat.size(), (1024, 1024))
		self.assertEqual(cuMat.type(), cv.CV_8UC3)

	@unittest.skipIf(cv.cuda.getCudaEnabledDeviceCount() == 0, "No cuda device found")
	def test_cuda_release(self):

		npMat = (np.random.random((128, 128, 3)) * 255).astype(np.uint8)
		cuMat = cv.cuda_GpuMat()
		cuMat.upload(npMat)
		cuMat.release()

		self.assertTrue(cuMat.cudaPtr() == 0)
		self.assertTrue(cuMat.step == 0)
		self.assertTrue(cuMat.size() == (0, 0))

	@unittest.skipIf(cv.cuda.getCudaEnabledDeviceCount() == 0, "No cuda device found")
	def test_cuda_denoising(self):

		self.assertEqual(True, hasattr(cv.cuda, 'fastNlMeansDenoising'))
		self.assertEqual(True, hasattr(cv.cuda, 'fastNlMeansDenoisingColored'))
		self.assertEqual(True, hasattr(cv.cuda, 'nonLocalMeans'))

if __name__ == '__main__':

	unittest.main()