import unittest

import silenttestrunner

from mercurial import (

    error,

    scmutil,

)

class mockfile:

    def __init__(self, name, fs):

        self.name = name

        self.fs = fs

    def __enter__(self):

        return self

    def __exit__(self, *args, **kwargs):

        pass

    def write(self, text):

        self.fs.contents[self.name] = text

    def read(self):

        return self.fs.contents[self.name]

class mockvfs:

    def __init__(self):

        self.contents = {}

    def read(self, path):

        return mockfile(path, self).read()

    def readlines(self, path):

        # lines need to contain the trailing '\n' to mock the real readlines

        return [l for l in mockfile(path, self).read().splitlines(True)]

    def __call__(self, path, mode, atomictemp):

        return mockfile(path, self)

class testsimplekeyvaluefile(unittest.TestCase):

    def setUp(self):

        self.vfs = mockvfs()

    def testbasicwritingiandreading(self):

        dw = {b'key1': b'value1', b'Key2': b'value2'}

        scmutil.simplekeyvaluefile(self.vfs, b'kvfile').write(dw)

        self.assertEqual(

            sorted(self.vfs.read(b'kvfile').split(b'\n')),

            [b'', b'Key2=value2', b'key1=value1'],

        )

        dr = scmutil.simplekeyvaluefile(self.vfs, b'kvfile').read()

        self.assertEqual(dr, dw)

    if not getattr(unittest.TestCase, 'assertRaisesRegex', False):

        # Python 3.7 deprecates the regex*p* version, but 2.7 lacks

        # the regex version.

        assertRaisesRegex = (  # camelcase-required

            unittest.TestCase.assertRaisesRegexp

        )

    def testinvalidkeys(self):

        d = {b'0key1': b'value1', b'Key2': b'value2'}

        with self.assertRaisesRegex(

            error.ProgrammingError, 'keys must start with a letter.*'

        ):

            scmutil.simplekeyvaluefile(self.vfs, b'kvfile').write(d)

        d = {b'key1@': b'value1', b'Key2': b'value2'}

        with self.assertRaisesRegex(error.ProgrammingError, 'invalid key.*'):

            scmutil.simplekeyvaluefile(self.vfs, b'kvfile').write(d)

    def testinvalidvalues(self):

        d = {b'key1': b'value1', b'Key2': b'value2\n'}

        with self.assertRaisesRegex(error.ProgrammingError, 'invalid val.*'):

            scmutil.simplekeyvaluefile(self.vfs, b'kvfile').write(d)

    def testcorruptedfile(self):

        self.vfs.contents[b'badfile'] = b'ababagalamaga\n'

        with self.assertRaisesRegex(

            error.CorruptedState, 'dictionary.*element.*'

        ):

            scmutil.simplekeyvaluefile(self.vfs, b'badfile').read()

    def testfirstline(self):

        dw = {b'key1': b'value1'}

        scmutil.simplekeyvaluefile(self.vfs, b'fl').write(dw, firstline=b'1.0')

        self.assertEqual(self.vfs.read(b'fl'), b'1.0\nkey1=value1\n')

        dr = scmutil.simplekeyvaluefile(self.vfs, b'fl').read(

            firstlinenonkeyval=True

        )

        self.assertEqual(dr, {b'__firstline': b'1.0', b'key1': b'value1'})

if __name__ == "__main__":

    silenttestrunner.main(__name__)