import unittest
import os
import sys
from fontTools import t1Lib
from fontTools.pens.basePen import NullPen
from fontTools.misc.psCharStrings import T1CharString
import random


CWD = os.path.abspath(os.path.dirname(__file__))
DATADIR = os.path.join(CWD, 'data')
# I used `tx` to convert PFA to LWFN (stored in the data fork)
LWFN = os.path.join(DATADIR, 'TestT1-Regular.lwfn')
PFA = os.path.join(DATADIR, 'TestT1-Regular.pfa')
PFB = os.path.join(DATADIR, 'TestT1-Regular.pfb')
WEIRD_ZEROS = os.path.join(DATADIR, 'TestT1-weird-zeros.pfa')
# ellipsis is hinted with 55 131 296 131 537 131 vstem3 0 122 hstem
ELLIPSIS_HINTED = os.path.join(DATADIR, 'TestT1-ellipsis-hinted.pfa')


class FindEncryptedChunksTest(unittest.TestCase):

	def test_findEncryptedChunks(self):
		with open(PFA, "rb") as f:
			data = f.read()
		chunks = t1Lib.findEncryptedChunks(data)
		self.assertEqual(len(chunks), 3)
		self.assertFalse(chunks[0][0])
		# the second chunk is encrypted
		self.assertTrue(chunks[1][0])
		self.assertFalse(chunks[2][0])

	def test_findEncryptedChunks_weird_zeros(self):
		with open(WEIRD_ZEROS, 'rb') as f:
			data = f.read()

		# Just assert that this doesn't raise any exception for not finding the
		# end of eexec
		t1Lib.findEncryptedChunks(data)


class DecryptType1Test(unittest.TestCase):

	def test_decryptType1(self):
		with open(PFA, "rb") as f:
			data = f.read()
		decrypted = t1Lib.decryptType1(data)
		self.assertNotEqual(decrypted, data)


class ReadWriteTest(unittest.TestCase):

	def test_read_pfa_write_pfb(self):
		font = t1Lib.T1Font(PFA)
		data = self.write(font, 'PFB')
		self.assertEqual(font.getData(), data)

	def test_read_and_parse_pfa_write_pfb(self):
		font = t1Lib.T1Font(PFA)
		font.parse()
		saved_font = self.write(font, 'PFB', dohex=False, doparse=True)
		self.assertTrue(same_dicts(font.font, saved_font))

	def test_read_pfb_write_pfa(self):
		font = t1Lib.T1Font(PFB)
		# 'OTHER' == 'PFA'
		data = self.write(font, 'OTHER', dohex=True)
		self.assertEqual(font.getData(), data)

	def test_read_and_parse_pfb_write_pfa(self):
		font = t1Lib.T1Font(PFB)
		font.parse()
		# 'OTHER' == 'PFA'
		saved_font = self.write(font, 'OTHER', dohex=True, doparse=True)
		self.assertTrue(same_dicts(font.font, saved_font))

	def test_read_with_path(self):
		import pathlib
		font = t1Lib.T1Font(pathlib.Path(PFB))

	@staticmethod
	def write(font, outtype, dohex=False, doparse=False):
		temp = os.path.join(DATADIR, 'temp.' + outtype.lower())
		try:
			font.saveAs(temp, outtype, dohex=dohex)
			newfont = t1Lib.T1Font(temp)
			if doparse:
				newfont.parse()
				data = newfont.font
			else:
				data = newfont.getData()
		finally:
			if os.path.exists(temp):
				os.remove(temp)
		return data


class T1FontTest(unittest.TestCase):

	def test_parse_lwfn(self):
		# the extended attrs are lost on git so we can't auto-detect 'LWFN'
		font = t1Lib.T1Font(LWFN, kind="LWFN")
		font.parse()
		self.assertEqual(font['FontName'], 'TestT1-Regular')
		self.assertTrue('Subrs' in font['Private'])

	def test_parse_pfa(self):
		font = t1Lib.T1Font(PFA)
		font.parse()
		self.assertEqual(font['FontName'], 'TestT1-Regular')
		self.assertTrue('Subrs' in font['Private'])

	def test_parse_pfb(self):
		font = t1Lib.T1Font(PFB)
		font.parse()
		self.assertEqual(font['FontName'], 'TestT1-Regular')
		self.assertTrue('Subrs' in font['Private'])

	def test_getGlyphSet(self):
		font = t1Lib.T1Font(PFA)
		glyphs = font.getGlyphSet()
		i = random.randrange(len(glyphs))
		aglyph = list(glyphs.values())[i]
		self.assertTrue(hasattr(aglyph, 'draw'))
		self.assertFalse(hasattr(aglyph, 'width'))
		aglyph.draw(NullPen())
		self.assertTrue(hasattr(aglyph, 'width'))


class EditTest(unittest.TestCase):

	def test_edit_pfa(self):
		font = t1Lib.T1Font(PFA)
		ellipsis = font.getGlyphSet()["ellipsis"]
		ellipsis.decompile()
		program = []
		for v in ellipsis.program:
			try:
				program.append(int(v))
			except:
				program.append(v)
				if v == 'hsbw':
					hints = [55, 131, 296, 131, 537, 131, 'vstem3', 0, 122, 'hstem']
					program.extend(hints)
		ellipsis.program = program
		# 'OTHER' == 'PFA'
		saved_font = self.write(font, 'OTHER', dohex=True, doparse=True)
		hinted_font = t1Lib.T1Font(ELLIPSIS_HINTED)
		hinted_font.parse()
		self.assertTrue(same_dicts(hinted_font.font, saved_font))

	@staticmethod
	def write(font, outtype, dohex=False, doparse=False):
		temp = os.path.join(DATADIR, 'temp.' + outtype.lower())
		try:
			font.saveAs(temp, outtype, dohex=dohex)
			newfont = t1Lib.T1Font(temp)
			if doparse:
				newfont.parse()
				data = newfont.font
			else:
				data = newfont.getData()
		finally:
			if os.path.exists(temp):
				os.remove(temp)
		return data


def same_dicts(dict1, dict2):
	if dict1.keys() != dict2.keys():
		return False
	for key, value in dict1.items():
		if isinstance(value, dict):
			if not same_dicts(value, dict2[key]):
				return False
		elif isinstance(value, list):
			if len(value) != len(dict2[key]):
				return False
			for elem1, elem2 in zip(value, dict2[key]):
				if isinstance(elem1, T1CharString):
					elem1.compile()
					elem2.compile()
					if elem1.bytecode != elem2.bytecode:
						return False
				else:
					if elem1 != elem2:
						return False
		elif isinstance(value, T1CharString):
			value.compile()
			dict2[key].compile()
			if value.bytecode != dict2[key].bytecode:
				return False
		else:
			if value != dict2[key]:
				return False
	return True


if __name__ == '__main__':
	import sys
	sys.exit(unittest.main())