import unittest
import os
from fontTools import afmLib


CWD = os.path.abspath(os.path.dirname(__file__))
DATADIR = os.path.join(CWD, 'data')
AFM = os.path.join(DATADIR, 'TestAFM.afm')


class AFMTest(unittest.TestCase):

	def test_read_afm(self):
		afm = afmLib.AFM(AFM)
		self.assertEqual(sorted(afm.kernpairs()), 
			sorted([('V', 'A'), ('T', 'comma'), ('V', 'd'), ('T', 'c'), ('T', 'period')]))
		self.assertEqual(afm['V', 'A'], -60)
		self.assertEqual(afm['V', 'd'], 30)
		self.assertEqual(afm['A'], (65, 668, (8, -25, 660, 666)))

	def test_write_afm(self):
		afm = afmLib.AFM(AFM)
		newAfm, afmData = self.write(afm)
		self.assertEqual(afm.kernpairs(), newAfm.kernpairs())
		self.assertEqual(afm.chars(), newAfm.chars())
		self.assertEqual(afm.comments(), newAfm.comments()[1:])  # skip the "generated by afmLib" comment
		for pair in afm.kernpairs():
			self.assertEqual(afm[pair], newAfm[pair])
		for char in afm.chars():
			self.assertEqual(afm[char], newAfm[char])
		with open(AFM, 'r') as f:
			originalLines = f.read().splitlines()
		newLines = afmData.splitlines()
		del newLines[1]  # remove the "generated by afmLib" comment
		self.assertEqual(originalLines, newLines)

	@staticmethod
	def write(afm, sep='\r'):
		temp = os.path.join(DATADIR, 'temp.afm')
		try:
			afm.write(temp, sep)
			with open(temp, 'r') as f:
				afmData = f.read()
			afm = afmLib.AFM(temp)
		finally:
			if os.path.exists(temp):
				os.remove(temp)
		return afm, afmData


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