# Copyright 2014 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

from __future__ import division
from __future__ import absolute_import
import unittest

from telemetry.internal.util import external_modules

try:
  np = external_modules.ImportRequiredModule('numpy')
except ImportError:
  pass
else:
  class CVUtilTest(unittest.TestCase):
    def __init__(self, *args, **kwargs):
      super(CVUtilTest, self).__init__(*args, **kwargs)
      # Import modules with dependencies that may not be preset in test setup so
      # that importing this unit test doesn't cause the test runner to raise an
      # exception.
      from telemetry.internal.image_processing import cv_util
      self.cv_util = cv_util

    def testAreLinesOrthogonalish(self):
      l1 = np.asfarray((0, 0, 1, 0))
      l2 = np.asfarray((0, 0, 0, 1))
      self.assertTrue(self.cv_util.AreLinesOrthogonal(l1, l2, 0))
      self.assertTrue(self.cv_util.AreLinesOrthogonal(l2, l1, 0))
      #2To3-division: these lines are unchanged as result is expected floats.
      self.assertFalse(self.cv_util.AreLinesOrthogonal(l1, l1,
                                                       np.pi / 2 - 1e-10))
      self.assertFalse(self.cv_util.AreLinesOrthogonal(l2, l2,
                                                       np.pi / 2 - 1e-10))
      self.assertTrue(self.cv_util.AreLinesOrthogonal(l1, l1, np.pi / 2))
      self.assertTrue(self.cv_util.AreLinesOrthogonal(l2, l2, np.pi / 2))

      l3 = np.asfarray((0, 0, 1, 1))
      l4 = np.asfarray((1, 1, 0, 0))
      self.assertFalse(self.cv_util.AreLinesOrthogonal(l3, l4,
                                                       np.pi / 2 - 1e-10))
      self.assertTrue(self.cv_util.AreLinesOrthogonal(l3, l1, np.pi / 4))

      l5 = np.asfarray((0, 1, 1, 0))
      self.assertTrue(self.cv_util.AreLinesOrthogonal(l3, l5, 0))

    def testFindLineIntersection(self):
      l1 = np.asfarray((1, 1, 2, 1))
      l2 = np.asfarray((1, 1, 1, 2))
      ret, p = self.cv_util.FindLineIntersection(l1, l2)
      self.assertTrue(ret)
      self.assertTrue(np.array_equal(p, np.array([1, 1])))
      l3 = np.asfarray((1.1, 1, 2, 1))
      ret, p = self.cv_util.FindLineIntersection(l2, l3)
      self.assertFalse(ret)
      self.assertTrue(np.array_equal(p, np.array([1, 1])))
      l4 = np.asfarray((2, 1, 1, 1))
      l5 = np.asfarray((1, 2, 1, 1))
      ret, p = self.cv_util.FindLineIntersection(l4, l5)
      self.assertTrue(ret)
      self.assertTrue(np.array_equal(p, np.array([1, 1])))
      l6 = np.asfarray((1, 1, 0, 0))
      l7 = np.asfarray((0, 1, 1, 0))
      ret, p = self.cv_util.FindLineIntersection(l7, l6)
      self.assertTrue(ret)
      self.assertTrue(np.array_equal(p, np.array([0.5, 0.5])))
      l8 = np.asfarray((0, 0, 0, 1))
      l9 = np.asfarray((1, 0, 1, 1))
      ret, p = self.cv_util.FindLineIntersection(l8, l9)
      self.assertFalse(ret)
      self.assertTrue(np.isnan(p[0]))

    def testExtendLines(self):
      l1 = (-1, 0, 1, 0)
      l2 = (0, -1, 0, 1)
      l3 = (4, 4, 6, 6)
      l4 = (1, 1, 1, 1)
      lines = self.cv_util.ExtendLines(np.asfarray([l1, l2, l3, l4],
                                                   dtype=np.float64), 10)
      lines = np.around(lines, 10)
      expected0 = ((5.0, 0.0, -5.0, 0.0))
      self.assertAlmostEqual(np.sum(np.abs(np.subtract(lines[0], expected0))),
                             0.0, 7)
      expected1 = ((0.0, 5.0, 0.0, -5.0))
      self.assertAlmostEqual(np.sum(np.abs(np.subtract(lines[1], expected1))),
                             0.0, 7)

      off = np.divide(np.sqrt(50), 2, dtype=np.float64)
      expected2 = ((5 + off, 5 + off, 5 - off, 5 - off))
      self.assertAlmostEqual(np.sum(np.abs(np.subtract(lines[2], expected2))),
                             0.0, 7)
      expected3 = ((-4, 1, 6, 1))
      self.assertAlmostEqual(np.sum(np.abs(np.subtract(lines[3], expected3))),
                             0.0, 7)

    def testIsPointApproxOnLine(self):
      p1 = np.asfarray((-1, -1))
      l1 = np.asfarray((0, 0, 100, 100))
      p2 = np.asfarray((1, 2))
      p3 = np.asfarray((2, 1))
      p4 = np.asfarray((3, 1))
      self.assertTrue(self.cv_util.IsPointApproxOnLine(p1, l1, 1 + 1e-7))
      self.assertTrue(self.cv_util.IsPointApproxOnLine(p2, l1, 1 + 1e-7))
      self.assertTrue(self.cv_util.IsPointApproxOnLine(p3, l1, 1 + 1e-7))
      self.assertFalse(self.cv_util.IsPointApproxOnLine(p4, l1, 1 + 1e-7))

    def testSqDistances(self):
      p1 = np.array([[0, 2], [0, 3]])
      p2 = np.array([2, 0])
      dists = self.cv_util.SqDistance(p1, p2)
      self.assertEqual(dists[0], 8)
      self.assertEqual(dists[1], 13)

    def testSqDistance(self):
      p1 = np.array([0, 2])
      p2 = np.array([2, 0])
      self.assertEqual(self.cv_util.SqDistance(p1, p2), 8)
