# -*- coding: utf-8 -*-
# the utf-8 is important because we do use the characters
"""Tests of start_command function family (location independent)"""

import sys
from grass.gunittest.case import TestCase
from grass.gunittest.main import test

from grass.script.core import start_command, PIPE, run_command, write_command
from grass.script.core import read_command, find_program
from grass.script.utils import encode


class TestPythonKeywordsInParameters(TestCase):
    """Tests additional underscore syntax which helps to avoid Python keywords

    It works the same for keywords, buildins and any names.
    """

    raster = b'does_not_exist'

    def test_prefixed_underscore(self):
        proc = start_command(
            'g.region', _raster=self.raster, stderr=PIPE)
        stderr = proc.communicate()[1]
        self.assertNotIn(b'_raster', stderr)
        self.assertIn(self.raster, stderr,
                      msg="Raster map name should appear in the error output")

    def test_suffixed_underscore(self):
        proc = start_command(
            'g.region', raster_=self.raster, stderr=PIPE)
        stderr = proc.communicate()[1]
        self.assertNotIn(b'raster_', stderr)
        self.assertIn(self.raster, stderr,
                      msg="Raster map name should appear in the error output")

    def test_multiple_underscores(self):
        proc = start_command(
            'g.region', _raster_=self.raster, stderr=PIPE)
        stderr = proc.communicate()[1]
        returncode = proc.poll()
        self.assertEquals(returncode, 1)
        self.assertIn(b'raster', stderr)


class TestPythonModuleWithUnicodeParameters(TestCase):
    """Tests if unicode works in parameters of Python modules

    This in fact tests also the `parser()` function (original motivation
    for this tests).

    Using g.search.module because it takes any option values.
    """

    def test_python_module_ascii(self):
        """This tests if Python module works"""
        run_command('g.search.modules', keyword='Priserny kun', encoding=None)

    def test_python_module_ascii_with_encoding(self):
        """This tests if Python module works with user-specified encoding"""
        run_command('g.search.modules', keyword='Priserny kun',
                    encoding='utf-16')

    def test_python_module_czech_nonascii(self):
        """This likely fails on non-UTF-8 systems (i.e. MS Win)"""
        run_command('g.search.modules', keyword='Příšerný kůň')

    def test_python_module_czech_unicode(self):
        """This likely fails on non-UTF-8 systems (i.e. MS Win)"""
        run_command('g.search.modules', keyword=u'Příšerný kůň')


class TestPythonModuleWithStdinStdout(TestCase):
    raster = 'rand_raster'

    @classmethod
    def setUpClass(cls):
        cls.runModule('g.region', s=0, n=10, w=0, e=10, res=1)
        cls.runModule("r.mapcalc", expression="{} = rand(1, 5)".
                      format(cls.raster), seed=1, overwrite=True)

    @classmethod
    def tearDownClass(cls):
        cls.runModule("g.remove", type='raster', name=cls.raster,
                      flags='f')

    def test_write_labels_unicode(self):
        """This tests if Python module works"""
        find_program('ls', '--version')
        write_command('r.category', map=self.raster, rules='-',
                      stdin='1:kůň\n2:kráva\n3:ovečka\n4:býk', separator=':')
        res = read_command('r.category', map=self.raster,
                           separator=':').strip()
        self.assertEquals(res, u'1:kůň\n2:kráva\n3:ovečka\n4:býk')
        if sys.version_info.major >= 3:
            self.assertIsInstance(res, str)
        else:
            self.assertIsInstance(res, unicode)

    def test_write_labels_bytes(self):
        """This tests if Python module works"""
        write_command('r.category', map=self.raster, rules='-',
                      stdin='1:kůň\n2:kráva\n3:ovečka\n4:býk',
                      separator=':', encoding=None)
        res = read_command('r.category', map=self.raster,
                           separator=':', encoding=None).strip()
        self.assertEquals(res, encode('1:kůň\n2:kráva\n3:ovečka\n4:býk'))
        self.assertIsInstance(res, bytes)

if __name__ == '__main__':
    test()