import unittest

from svgelements import *


class TestElementLinear(unittest.TestCase):

    def test_linear_nearest(self):
        line = Line((0,0),(5,0))
        r = line.closest_segment_point((17,0))
        self.assertEqual(r, (5,0))
        r = line.closest_segment_point((2, 2))
        self.assertEqual(r, (2, 0))


class TestBoundingBox(unittest.TestCase):

    def test_linear_bbox(self):
        line = Line((0,0), (5,0))
        r = line.bbox()
        self.assertEqual(r, (0, 0, 5, 0))

    def test_qbezier_bbox(self):
        line = QuadraticBezier((0,0), (2,2), (5,0))
        r = line.bbox()
        self.assertEqual(r, (0, 0, 5, 1))

    def test_cbezier_bbox(self):
        line = CubicBezier((0,0), (2,2), (2,-2), (5,0))
        r = line.bbox()
        for z in zip(r, (0.0, -0.5773502691896257, 5.0, 0.5773502691896257)):
            self.assertAlmostEqual(*z)

    def test_arc_bbox(self):
        line = Arc((0,0), (5,0), control=(2.5, 2.5))
        r = line.bbox()
        for z in zip(r, (0.0, 0, 5.0, 2.5)):
            self.assertAlmostEqual(*z)

    def test_null_arc_bbox(self):
        self.assertEqual(Path("M0,0A0,0 0 0 0 0,0z").bbox(), (0,0,0,0))


class TestArcControlPoints(unittest.TestCase):

    def test_coincident_end_arc(self):
        """
        Tests the creation of a control point with a coincident start and end.
        """
        arc = Arc(start=(0,0), control=(50,0), end=(0,0))
        self.assertAlmostEqual(arc.rx, 25)

    def test_linear_arc(self):
        """
        Colinear Arcs should raise value errors.
        """
        arc_vertical = Arc(start=(0, 0), control=(25, 0), end=(50, 0))
        # print(arc_vertical)
        arc_horizontal = Arc(start=(0, 0), control=(0, 25), end=(0, 50))
        # print(arc_horizontal)