# coding=utf-8
"""Test units inkex module functionality"""
from inkex.units import are_near_relative, convert_unit, discover_unit, parse_unit, render_unit
from inkex.tester import TestCase


class UnitsTest(TestCase):
    """Tests for Inkscape Units handling"""

    def test_parse_unit(self):
        """Test parsing a unit in a document"""
        self.assertEqual(parse_unit('50px'), (50.0, 'px'))
        self.assertEqual(parse_unit('50'), (50.0, 'px'))
        self.assertEqual(parse_unit('50quaks'), None)
        self.assertEqual(parse_unit('50quaks', default_value=10), (10.0, 'px'))

    def test_near(self):
        """Test the closeness of numbers"""
        self.assertFalse(are_near_relative(10.0, 5.0))
        self.assertTrue(are_near_relative(10.0, 9.99))

    def test_discover_unit(self):
        """Based on the size of a document and it's viewBox"""
        self.assertEqual(discover_unit('50px', 50), 'px')
        self.assertEqual(discover_unit('100mm', 3.94), 'in')
        self.assertEqual(discover_unit('3779', 1.0), 'm')
        self.assertEqual(discover_unit('50quaks', 150), 'px')

    def test_convert_unit(self):
        """Convert units from one to another"""
        self.assertEqual(convert_unit("10mm", 'px'), 37.79527559055118)
        self.assertEqual(convert_unit("1in", 'cm'), 2.54)
        self.assertEqual(convert_unit("37.79527559055118px", 'mm'), 10.0)

    def test_render_unit(self):
        """Convert unit and value pair into rendered unit string"""
        self.assertEqual(render_unit(10.0, 'mm'), '10mm')
        self.assertEqual(render_unit(10.01, 'mm'), '10.01mm')
        self.assertEqual(render_unit(10.000001, 'mm'), '10mm')
        self.assertEqual(render_unit('10cm', 'mm'), '10cm')

    def test_number_parsing(self):
        """Width number parsing test"""
        for value in (
                '100mm',
                '100  mm',
                '   100mm',
                '100mm    ',
                '+100mm',
                '100.0mm',
                '100.0e0mm',
                '10.0e1mm',
                '10.0e+1mm',
                '1000.0e-1mm',
                '.1e+3mm',
                '+.1e+3mm'):
            self.assertEqual(parse_unit(value), (100, 'mm'))
