# (C) Copyright 2005-2021 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
""" Tests for kiva.fonttools.font
"""
import os
import unittest

from kiva.api import BOLD, Font, ITALIC, MODERN, ROMAN
from kiva.fonttools import str_to_font
from kiva.fonttools.tests._testing import patch_global_font_manager


class TestFont(unittest.TestCase):
    def setUp(self):
        # Invalidate the global font manager cache to avoid test interaction
        # as well as catching erroneous assumption on an existing cache.
        font_manager_patcher = patch_global_font_manager(None)
        font_manager_patcher.start()
        self.addCleanup(font_manager_patcher.stop)

    def test_find_font_empty_name(self):
        # This test relies on the fact there exists some fonts on the system
        # that the font manager can load. Ideally we should be able to redirect
        # the path from which the font manager loads font files, then this test
        # can be less fragile.
        font = Font(face_name="")
        spec = font.findfont()
        self.assertTrue(os.path.exists(spec.filename))

    def test_find_font_some_face_name(self):
        font = Font(face_name="ProbablyNotFound")

        # There will be warnings as there will be no match for the requested
        # face name.
        with self.assertWarns(UserWarning):
            spec = font.findfont()
        self.assertTrue(os.path.exists(spec.filename))

    def test_find_font_name(self):
        font = Font(face_name="ProbablyNotFound")

        # There will be warnings as there will be no match for the requested
        # face name.
        with self.assertWarns(UserWarning):
            name = font.findfontname()

        # Name should be nonempty.
        self.assertGreater(len(name), 0)

    def test_find_font_for_language(self):
        font = Font(face_name="")

        # Nearly every font supports Latin script, so this shouldn't fail
        spec = font.findfont(language="Latin")
        self.assertTrue(os.path.exists(spec.filename))

        # There will be warnings for an unknown language
        with self.assertWarns(UserWarning):
            spec = font.findfont(language="FancyTalk")
        self.assertTrue(os.path.exists(spec.filename))

    def test_str_to_font(self):
        # Simple
        from_str = str_to_font("modern 10")
        from_ctor = Font(family=MODERN, size=10)
        self.assertEqual(from_ctor, from_str)

        # Some complexity
        from_str = str_to_font("roman bold italic 12")
        from_ctor = Font(family=ROMAN, weight=BOLD, style=ITALIC, size=12)
        self.assertEqual(from_ctor, from_str)

        # Lots of complexity
        from_str = str_to_font("Times roman bold italic underline 72")
        from_ctor = Font(
            "Times",
            family=ROMAN,
            weight=BOLD,
            style=ITALIC,
            size=72,
            underline=1,
        )
        self.assertEqual(from_ctor, from_str)