# coding=utf-8
"""
Test each of the extensions base classes (if needed) and sometimes provide
specialised test classes for testers to use.
"""
import inkex
from inkex.tester import ComparisonMixin, TestCase

class TurnGreenEffect(inkex.ColorExtension):
    """Turn everything the purest green!"""
    def modify_color(self, name, color):
        return inkex.Color('green')
    def modify_opacity(self, name, opacity):
        if name == 'opacity':
            return 1.0
        return opacity

class ColorEffectTest(ComparisonMixin, TestCase):
    """Direct tests for color mechanisms"""
    effect_class = TurnGreenEffect
    effect_name = 'inkex_extensions_color'
    compare_file = 'svg/colors.svg'
    python3_only = True

    comparisons = [
        ('--id=r1',), # One shape only
        ('--id=r2',), # CSS Styles
        ('--id=r3',), # Element Attributes
        ('--id=r4',), # Gradient stops
        ('--id=r1', '--id=r2'), # Two shapes
        ('--id=color_svg',), # Recursive group/children
        (), # Process all shapes
    ]

class ColorBaseCase(TestCase):
    """Base class for all color effect extensions"""
    color_tests = []
    opacity_tests = []

    def _test_list(self, tsts):
        for tst in tsts:
            inp, outp, args = (list(tst) + [[]])[:3]
            self.effect.parse_arguments([self.empty_svg] + args)
            yield inp, outp

    def test_colors(self):
        """Run all color tests"""
        for x, (inp, outp) in enumerate(self._test_list(self.color_tests)):
            outp = inkex.Color(outp)
            got = self.effect._modify_color('fill', inkex.Color(inp))
            self.assertTrue(isinstance(got, inkex.Color),\
                "Bad output type: {}".format(type(got).__name__))
            outp, got = str(outp), str(got.to(outp.space))
            self.assertEqual(outp, got,\
                "Color mismatch, test:{} {} != {}".format(x, outp, got))
        for x, (inp, outp) in enumerate(self._test_list(self.opacity_tests)):
            got = self.effect.modify_opacity('opacity', inp)
            self.assertTrue(isinstance(got, float))
            self.assertAlmostEqual(got, outp, delta=0.1)