#!/usr/bin/env python
# -*- coding: utf-8 -*-

import pytest

from array import array

import pyipmi.msgs.device_messaging
from pyipmi.utils import (ByteBuffer, chunks, check_completion_code,
                          check_rsp_completion_code)
from pyipmi.errors import DecodingError, CompletionCodeError
from pyipmi.msgs import decode_message


def test_bytebuffer_init_from_list():
    buf = ByteBuffer([0xf8])
    assert buf.array == array('B', [0xf8])


def test_bytebuffer_init_from_tuple():
    buf = ByteBuffer((0xf8,))
    assert buf.array == array('B', [0xf8])


def test_bytebuffer_initi_fromstring():
    buf = ByteBuffer(b'\xf8')
    assert buf.array == array('B', [0xf8])


def test_bytebuffer_push_unsigned_int():
    buf = ByteBuffer((1, 0))
    buf.push_unsigned_int(255, 1)
    assert buf[0] == 1
    assert buf[1] == 0
    assert buf[2] == 255
    buf.push_unsigned_int(255, 2)
    assert buf[3] == 255
    assert buf[4] == 0
    buf.push_unsigned_int(256, 2)
    assert buf[5] == 0
    assert buf[6] == 1


def test_bytebuffer_pop_unsigned_int():
    buf = ByteBuffer((1, 0, 0, 0))
    assert buf.pop_unsigned_int(1) == 1

    buf = ByteBuffer((0, 1, 0, 0))
    assert buf.pop_unsigned_int(2) == 0x100

    buf = ByteBuffer((0, 0, 1, 0))
    assert buf.pop_unsigned_int(3) == 0x10000

    buf = ByteBuffer((0, 0, 0, 1))
    assert buf.pop_unsigned_int(4) == 0x1000000


def test_bytebuffer_pop_unsigned_int_error():
    with pytest.raises(DecodingError):
        buf = ByteBuffer((0, 0))
        buf.pop_unsigned_int(3)


def test_bytebuffer_push_string():
    buf = ByteBuffer()
    buf.push_string(b'0123')
    assert buf[0] == 0x30
    assert buf[1] == 0x31
    assert buf[2] == 0x32
    assert buf[3] == 0x33
    assert buf.tostring() == b'0123'

    buf = ByteBuffer()
    buf.push_string(b'\x00\xb4')
    assert buf.tostring() == b'\x00\xb4'


def test_bytebuffer_pop_string():
    buf = ByteBuffer(b'\x30\x31\x32\x33')
    assert buf.pop_string(2) == b'01'
    assert buf.tostring() == b'23'


def test_bytebuffer_tostring():
    buf = ByteBuffer(b'\x30\x31\x32\x33')
    assert buf.tostring() == b'0123'


def test_bytebuffer_pop_slice():
    buf = ByteBuffer(b'\x30\x31\x32\x33')
    cut = buf.pop_slice(1)
    assert buf.tostring() == b'123'
    assert cut.tostring() == b'0'

    buf = ByteBuffer(b'\x30\x31\x32\x33')
    cut = buf.pop_slice(2)
    assert buf.tostring() == b'23'
    assert cut.tostring() == b'01'

    buf = ByteBuffer(b'\x30\x31\x32\x33')
    cut = buf.pop_slice(3)
    assert buf.tostring() == b'3'
    assert cut.tostring() == b'012'

    buf = ByteBuffer(b'\x30\x31\x32\x33')
    cut = buf.pop_slice(4)
    assert buf.tostring() == b''
    assert cut.tostring() == b'0123'


def test_bytebuffer_pop_slice_error():
    with pytest.raises(DecodingError):
        buf = ByteBuffer(b'\x30\x31\x32\x33')
        buf.pop_slice(5)


def test_chunks():
    data = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
    result = list()
    for chunk in chunks(data, 2):
        result.extend(chunk)
        assert len(chunk) == 2
    assert result == [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]


def test_check_completion_code_ok():
    check_completion_code(0)


def test_check_specific_completion_code_ok():
    rsp = pyipmi.msgs.device_messaging.SetUserPasswordRsp()
    decode_message(rsp, b'\x00')
    check_rsp_completion_code(rsp)


def test_check_completion_code_desc():
    with pytest.raises(CompletionCodeError) as ex:
        check_completion_code(0xc1)
    assert ex.value.cc == 0xc1
    assert ex.value.cc_desc == "Invalid Command"


def test_check_completion_code_unknown_desc():
    with pytest.raises(CompletionCodeError) as ex:
        check_completion_code(0x81)
    assert ex.value.cc == 0x81
    assert ex.value.cc_desc == "Unknown error description"


def test_check_rsp_completion_code_desc():
    rsp = pyipmi.msgs.device_messaging.SetUserPasswordRsp()
    decode_message(rsp, b'\x81')
    with pytest.raises(CompletionCodeError) as ex:
        check_rsp_completion_code(rsp)
    assert rsp.cmdid == 71
    assert rsp.netfn == 6 | 1
    assert rsp.group_extension is None
    assert ex.value.cc == 0x81
    assert ex.value.cc_desc == "password test failed. Wrong password size was used."


def test_check_rsp_completion_code_unknown_desc():
    rsp = pyipmi.msgs.device_messaging.SetUserPasswordRsp()
    decode_message(rsp, b'\x42')
    with pytest.raises(CompletionCodeError) as ex:
        check_rsp_completion_code(rsp)
    assert ex.value.cc == 0x42
    assert ex.value.cc_desc == "Unknown error description"