#!/usr/bin/python

import unittest
import os
from pocketsphinx import Decoder, Jsgf

DATADIR = os.path.join(os.path.dirname(__file__), "../../test/data")


class TestJsgf(unittest.TestCase):
    def test_create_jsgf(self):
        jsgf = Jsgf(os.path.join(DATADIR, "goforward.gram"))
        del jsgf

    def test_jsgf(self):
        # Create a decoder with turtle language model
        decoder = Decoder(lm=os.path.join(DATADIR, "turtle.lm.bin"),
                          dict=os.path.join(DATADIR, "turtle.dic"))

        # Decode with lm
        decoder.start_utt()
        with open(os.path.join(DATADIR, "goforward.raw"), "rb") as stream:
            while True:
                buf = stream.read(1024)
                if buf:
                    decoder.process_raw(buf, False, False)
                else:
                    break
        decoder.end_utt()
        print('Decoding with "turtle" language:', decoder.hyp().hypstr)
        self.assertEqual("go forward ten meters", decoder.hyp().hypstr)

        # Switch to JSGF grammar
        jsgf = Jsgf(os.path.join(DATADIR, "goforward.gram"))
        rule = jsgf.get_rule("goforward.move2")
        fsg = jsgf.build_fsg(rule, decoder.logmath, 7.5)
        fsg.writefile("goforward.fsg")
        self.assertTrue(os.path.exists("goforward.fsg"))
        os.remove("goforward.fsg")

        decoder.add_fsg("goforward", fsg)
        self.assertNotEqual(decoder.current_search(), "goforward")
        decoder.activate_search("goforward")
        self.assertEqual(decoder.current_search(), "goforward")
        self.assertTrue(decoder.get_fsg())
        self.assertTrue(decoder.get_fsg("goforward"))
        self.assertIsNone(decoder.get_lm("foobiebletch"))

        decoder.start_utt()
        with open(os.path.join(DATADIR, "goforward.raw"), "rb") as stream:
            while True:
                buf = stream.read(1024)
                if buf:
                    decoder.process_raw(buf, False, False)
                else:
                    break
        decoder.end_utt()
        print('Decoding with "goforward" grammar:', decoder.hyp().hypstr)
        self.assertEqual("go forward ten meters", decoder.hyp().hypstr)


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