from __future__ import print_function, division, absolute_import
from __future__ import unicode_literals
from fontTools.misc.py23 import *
from fontTools.misc.xmlWriter import XMLWriter
from fontTools.misc.testTools import MockFont
from fontTools import mtiLib
import difflib
import os
import sys
import unittest


class BuilderTest(unittest.TestCase):
    # Feature files in testdata/*.txt; output gets compared to testdata/*.ttx.
    TESTS = {
	None: (
            #'mti/cmap',
	),
	'cmap': (
            #'mti/cmap',
	),
	'GSUB': (
	    'mti/scripttable',
	    'mti/chainedclass',
	    'mti/chainedcoverage',
	    'mti/chained-glyph',
	    'mti/gsubalternate',
	    'mti/gsubligature',
	    'mti/gsubmultiple',
	    'mti/gsubreversechanined',
	    'mti/gsubsingle',
	),
	'GPOS': (
	    'mti/scripttable',
	    'mti/chained-glyph',
	    'mti/gposcursive',
	    #'mti/gposkernset',
	    #'mti/gposmarktobase',
	    #'mti/gpospairclass',
	    #'mti/gpospairglyph',
	    #'mti/gpossingle',
	    'mti/mark-to-ligature',
	),
	'GDEF': (
	    'mti/gdefattach',
	    'mti/gdefclasses',
	    'mti/gdefligcaret',
	    'mti/gdefmarkattach',
	    'mti/gdefmarkfilter',
	),
    }
    # TODO:
    # https://github.com/Monotype/OpenType_Table_Source/issues/12
    #
    #        'mti/featuretable'
    #        'mti/contextclass'
    #        'mti/contextcoverage'
    #        'mti/context-glyph'

    def __init__(self, methodName):
        unittest.TestCase.__init__(self, methodName)
        # Python 3 renamed assertRaisesRegexp to assertRaisesRegex,
        # and fires deprecation warnings if a program uses the old name.
        if not hasattr(self, "assertRaisesRegex"):
            self.assertRaisesRegex = self.assertRaisesRegexp

    def setUp(self):
        pass

    def tearDown(self):
        pass

    @staticmethod
    def getpath(testfile):
        path, _ = os.path.split(__file__)
        return os.path.join(path, "testdata", testfile)

    def expect_ttx(self, actual_ttx, expected_ttx, fromfile=None, tofile=None):
        actual = actual_ttx.split('\n')
        expected = expected_ttx.split('\n')
        if actual != expected:
            for line in difflib.unified_diff(
                    expected, actual, fromfile=fromfile, tofile=tofile):
                sys.stdout.write(line+'\n')
            self.fail("TTX output is different from expected")

    def check_mti_file(self, name, tableTag=None):
        xml_expected_path = self.getpath("%s.ttx" % name + ('.'+tableTag if tableTag is not None else ''))
        xml_expected = open(xml_expected_path, 'rt', encoding="utf-8").read()
        f = open(self.getpath("%s.txt" % name), 'rt', encoding="utf-8")

	font = MockFont()
	table = mtiLib.build(f, font, tableTag=tableTag)

	if tableTag is not None:
	    self.assertEqual(tableTag, table.tableTag)
	tableTag = table.tableTag

	# Make sure it compiles.
	blob = table.compile(font)

	# Make sure it decompiles.
	decompiled = table.__class__()
	decompiled.decompile(blob, font)

	# XML from built object.
	writer = XMLWriter(StringIO(), newlinestr='\n')
	writer.begintag(tableTag); writer.newline()
	table.toXML(writer, font)
	writer.endtag(tableTag); writer.newline()
	xml_built = writer.file.getvalue()

	# XML from decompiled object.
	writer = XMLWriter(StringIO(), newlinestr='\n')
	writer.begintag(tableTag); writer.newline()
	decompiled.toXML(writer, font)
	writer.endtag(tableTag); writer.newline()
	xml_binary = writer.file.getvalue()

	self.expect_ttx(xml_built, xml_binary, fromfile='built', tofile='decompiled')
	self.expect_ttx(xml_built, xml_expected, fromfile='built', tofile=xml_expected_path)

def generate_mti_file_test(name, tableTag=None):
    return lambda self: self.check_mti_file(name, tableTag=tableTag)


for tableTag,tests in BuilderTest.TESTS.items():
    for name in tests:
        setattr(BuilderTest, "test_MtiFile_%s" % name,
                generate_mti_file_test(name, tableTag=tableTag))


if __name__ == "__main__":
    unittest.main()