import os

import pytest

from lib import util


class LoggedClassTest(util.LoggedClass):

    def __init__(self):
        super().__init__()
        self.logger.info = self.note_info
        self.logger.warning = self.note_warning
        self.logger.error = self.note_error

    def note_info(self, msg):
        self.info_msg = msg

    def note_warning(self, msg):
        self.warning_msg = msg

    def note_error(self, msg):
        self.error_msg = msg


def test_LoggedClass():
    test = LoggedClassTest()
    assert test.log_prefix == ''
    test.log_prefix = 'prefix'
    test.log_error('an error')
    assert test.error_msg == 'prefixan error'
    test.log_warning('a warning')
    assert test.warning_msg == 'prefixa warning'
    test.log_info('some info')
    assert test.info_msg == 'prefixsome info'

    assert test.throttled == 0
    test.log_info('some info', throttle=True)
    assert test.throttled == 1
    assert test.info_msg == 'prefixsome info'
    test.log_info('some info', throttle=True)
    assert test.throttled == 2
    assert test.info_msg == 'prefixsome info'
    test.log_info('some info', throttle=True)
    assert test.throttled == 3
    assert test.info_msg == 'prefixsome info (throttling later logs)'
    test.info_msg = ''
    test.log_info('some info', throttle=True)
    assert test.throttled == 4
    assert test.info_msg == ''


def test_cachedproperty():
    class Target:

        CALL_COUNT = 0

        def __init__(self):
            self.call_count = 0

        @util.cachedproperty
        def prop(self):
            self.call_count += 1
            return self.call_count

        @util.cachedproperty
        def cls_prop(cls):
            cls.CALL_COUNT += 1
            return cls.CALL_COUNT

    t = Target()
    assert t.prop == t.prop == 1
    assert Target.cls_prop == Target.cls_prop == 1

def test_formatted_time():
    assert util.formatted_time(0) == '00s'
    assert util.formatted_time(59) == '59s'
    assert util.formatted_time(60) == '01m 00s'
    assert util.formatted_time(3599) == '59m 59s'
    assert util.formatted_time(3600) == '01h 00m 00s'
    assert util.formatted_time(3600*24) == '1d 00h 00m'
    assert util.formatted_time(3600*24*367) == '367d 00h 00m'
    assert util.formatted_time(3600*24, ':') == '1d:00h:00m'

def test_deep_getsizeof():
    int_t = util.deep_getsizeof(1)
    assert util.deep_getsizeof('foo') == util.deep_getsizeof('') + 3
    assert util.deep_getsizeof([1, 1]) > 2 * int_t
    assert util.deep_getsizeof({1: 1}) > 2 * int_t
    assert util.deep_getsizeof({1: {1: 1}}) > 3 * int_t


class Base:
    pass


class A(Base):
    pass


class B(Base):
    pass


def test_subclasses():
    assert util.subclasses(Base) == [A, B]
    assert util.subclasses(Base, strict=False) == [A, B, Base]


def test_chunks():
    assert list(util.chunks([1, 2, 3, 4, 5], 2)) == [[1, 2], [3, 4], [5]]


def test_increment_byte_string():
    assert util.increment_byte_string(b'1') == b'2'
    assert util.increment_byte_string(b'\x01\x01') == b'\x01\x02'
    assert util.increment_byte_string(b'\xff\xff') is None

def test_bytes_to_int():
    assert util.bytes_to_int(b'\x07[\xcd\x15') == 123456789

def test_int_to_bytes():
    assert util.int_to_bytes(456789) == b'\x06\xf8U'

def test_int_to_varint():
    with pytest.raises(ValueError):
        util.int_to_varint(-1)
    assert util.int_to_varint(0) == b'\0'
    assert util.int_to_varint(5) == b'\5'
    assert util.int_to_varint(252) == b'\xfc'
    assert util.int_to_varint(253) == b'\xfd\xfd\0'
    assert util.int_to_varint(65535) == b'\xfd\xff\xff'
    assert util.int_to_varint(65536) == b'\xfe\0\0\1\0'
    assert util.int_to_varint(2**32-1) == b'\xfe\xff\xff\xff\xff'
    assert util.int_to_varint(2**32) == b'\xff\0\0\0\0\1\0\0\0'
    assert util.int_to_varint(2**64-1) \
        == b'\xff\xff\xff\xff\xff\xff\xff\xff\xff'

def test_LogicalFile(tmpdir):
    prefix = os.path.join(tmpdir, 'log')
    L = util.LogicalFile(prefix, 2, 6)
    with pytest.raises(FileNotFoundError):
        L.open_file(0, create=False)

    # Check L.open creates a file
    with L.open_file(8, create=True) as f:
        pass
    with util.open_file(prefix + '01') as f:
        pass

    L.write(0, b'987')
    assert L.read(0, -1) == b'987'
    assert L.read(0, 4) == b'987'
    assert L.read(1, 1) == b'8'

    L.write(0, b'01234567890')
    assert L.read(0, -1) == b'01234567890'
    assert L.read(5, -1) == b'567890'
    with util.open_file(prefix + '01') as f:
        assert f.read(-1) == b'67890'

    # Test file boundary
    L.write(0, b'957' * 6)
    assert L.read(0, -1) == b'957' * 6

def test_open_fns(tmpdir):
    tmpfile = os.path.join(tmpdir, 'file1')
    with pytest.raises(FileNotFoundError):
        util.open_file(tmpfile)
    with util.open_file(tmpfile, create=True) as f:
        f.write(b'56')
    with util.open_file(tmpfile) as f:
        assert f.read(3) == b'56'

    # Test open_truncate truncates and creates
    with util.open_truncate(tmpfile) as f:
        assert f.read(3) == b''
    tmpfile = os.path.join(tmpdir, 'file2')
    with util.open_truncate(tmpfile) as f:
        assert f.read(3) == b''

def test_address_string():
    assert util.address_string(('foo.bar', 84)) == 'foo.bar:84'
    assert util.address_string(('1.2.3.4', 84)) == '1.2.3.4:84'
    assert util.address_string(('0a::23', 84)) == '[a::23]:84'

def test_is_valid_hostname():
    is_valid_hostname = util.is_valid_hostname
    assert not is_valid_hostname('')
    assert is_valid_hostname('a')
    assert is_valid_hostname('_')
    # Hyphens
    assert not is_valid_hostname('-b')
    assert not is_valid_hostname('a.-b')
    assert is_valid_hostname('a-b')
    assert not is_valid_hostname('b-')
    assert not is_valid_hostname('b-.c')
    # Dots
    assert is_valid_hostname('a.')
    assert is_valid_hostname('foo1.Foo')
    assert not is_valid_hostname('foo1..Foo')
    assert is_valid_hostname('12Foo.Bar.Bax_')
    assert is_valid_hostname('12Foo.Bar.Baz_12')
    # 63 octets in part
    assert is_valid_hostname('a.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMN'
                             'OPQRSTUVWXYZ0123456789_.bar')
    # Over 63 octets in part
    assert not is_valid_hostname('a.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMN'
                                 'OPQRSTUVWXYZ0123456789_1.bar')
    len255 = ('a' * 62 + '.') * 4 + 'abc'
    assert is_valid_hostname(len255)
    assert not is_valid_hostname(len255 + 'd')


def test_protocol_tuple():
    assert util.protocol_tuple(None) == (0, )
    assert util.protocol_tuple("foo") == (0, )
    assert util.protocol_tuple(1) == (0, )
    assert util.protocol_tuple("1") == (1, )
    assert util.protocol_tuple("0.1") == (0, 1)
    assert util.protocol_tuple("0.10") == (0, 10)
    assert util.protocol_tuple("2.5.3") == (2, 5, 3)

def test_protocol_version_string():
    assert util.protocol_version_string(()) == "0.0"
    assert util.protocol_version_string((1, )) == "1.0"
    assert util.protocol_version_string((1, 2)) == "1.2"
    assert util.protocol_version_string((1, 3, 2)) == "1.3.2"

def test_protocol_version():
    assert util.protocol_version(None, "1.0", "1.0") == (1, 0)
    assert util.protocol_version("0.10", "0.10", "1.1") == (0, 10)

    assert util.protocol_version("1.0", "1.0", "1.0") == (1, 0)
    assert util.protocol_version("1.0", "1.0", "1.1") == (1, 0)
    assert util.protocol_version("1.1", "1.0", "1.1") == (1, 1)
    assert util.protocol_version("1.2", "1.0", "1.1") is None
    assert util.protocol_version("0.9", "1.0", "1.1") is None

    assert util.protocol_version(["0.9", "1.0"], "1.0", "1.1") == (1, 0)
    assert util.protocol_version(["0.9", "1.1"], "1.0", "1.1") == (1, 1)
    assert util.protocol_version(["1.1", "0.9"], "1.0", "1.1") is None
    assert util.protocol_version(["0.8", "0.9"], "1.0", "1.1") is None
    assert util.protocol_version(["1.1", "1.2"], "1.0", "1.1") == (1, 1)
    assert util.protocol_version(["1.2", "1.3"], "1.0", "1.1") is None


def test_unpackers():
    b = bytes(range(256))
    assert util.unpack_int32_from(b, 0) == (50462976,)
    assert util.unpack_int32_from(b, 42) == (757869354,)
    assert util.unpack_int64_from(b, 0) == (506097522914230528,)
    assert util.unpack_int64_from(b, 42) == (3544384782113450794,)

    assert util.unpack_uint16_from(b, 0) == (256,)
    assert util.unpack_uint16_from(b, 42) == (11050,)
    assert util.unpack_uint32_from(b, 0) == (50462976,)
    assert util.unpack_uint32_from(b, 42) == (757869354,)
    assert util.unpack_uint64_from(b, 0) == (506097522914230528,)
    assert util.unpack_uint64_from(b, 42) == (3544384782113450794,)

def test_hex_transforms():
    h = "AABBCCDDEEFF"
    assert util.hex_to_bytes(h) == b'\xaa\xbb\xcc\xdd\xee\xff'