# Path: pym2149/lfsr.py
# class Lfsr:
# 
#     def __init__(self, nzdegrees):
#         self.mask = sum(1 << (nzd - 1) for nzd in nzdegrees)
#         self.x = 1
# 
#     def __call__(self):
#         bit = self.x & 1
#         self.x >>= 1
#         if bit:
#             self.x ^= self.mask
#         return 1 - bit # Authentic, see qnoispec.
# 
#     def __iter__(self):
#         first = self.x
#         while True:
#             yield self()
#             if first == self.x:
#                 break
# 
# Path: pym2149/ym2149.py
# TP = lambda f, r: ((r & 0x0f) << 8) | f
# NP = lambda p: p & 0x1f
# EP = lambda f, r: (r << 8) | f
# class MixerFlag:
# class LogicalRegisters:
# class PhysicalRegisters:
# class YM2149(Container):
#     def __init__(self, bit):
#     def __call__(self, m):
#     def __init__(self, config, clockinfo, minnoiseperiod = 1):
#     def __init__(self, config, logical):
#     def __init__(self, config, clockinfo, ampscale, logical):
#     def callimpl(self):


from .lfsr import Lfsr
from .ym2149 import ym2149nzdegrees
from unittest import TestCase
# Copyright 2014, 2018, 2019, 2020 Andrzej Cichocki

# This file is part of pym2149.
#
# pym2149 is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# pym2149 is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with pym2149.  If not, see <http://www.gnu.org/licenses/>.


class TestLfsr(TestCase):

    def test_correctsequence(self):
        # Subsequence of the real LFSR from Hatari mailing list:
        expected = (0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0)
        # According to qnoispec, raw LFSR 1 maps to amp 0, so we flip our LFSR:
        expected = [1 - x for x in expected]

# Path: pym2149/lfsr.py
# class Lfsr:
# 
#     def __init__(self, nzdegrees):
#         self.mask = sum(1 << (nzd - 1) for nzd in nzdegrees)
#         self.x = 1
# 
#     def __call__(self):
#         bit = self.x & 1
#         self.x >>= 1
#         if bit:
#             self.x ^= self.mask
#         return 1 - bit # Authentic, see qnoispec.
# 
#     def __iter__(self):
#         first = self.x
#         while True:
#             yield self()
#             if first == self.x:
#                 break
# 
# Path: pym2149/ym2149.py
# TP = lambda f, r: ((r & 0x0f) << 8) | f
# NP = lambda p: p & 0x1f
# EP = lambda f, r: (r << 8) | f
# class MixerFlag:
# class LogicalRegisters:
# class PhysicalRegisters:
# class YM2149(Container):
#     def __init__(self, bit):
#     def __call__(self, m):
#     def __init__(self, config, clockinfo, minnoiseperiod = 1):
#     def __init__(self, config, logical):
#     def __init__(self, config, clockinfo, ampscale, logical):
#     def callimpl(self):


# Path: pym2149/test_lfsr.py
from .lfsr import Lfsr
from .ym2149 import ym2149nzdegrees
from unittest import TestCase

# Copyright 2014, 2018, 2019, 2020 Andrzej Cichocki

# This file is part of pym2149.
#
# pym2149 is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# pym2149 is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with pym2149.  If not, see <http://www.gnu.org/licenses/>.


class TestLfsr(TestCase):

    def test_correctsequence(self):
        # Subsequence of the real LFSR from Hatari mailing list:
        expected = (0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0)
        # According to qnoispec, raw LFSR 1 maps to amp 0, so we flip our LFSR:
        expected = [1 - x for x in expected]

        actual = tuple(Lfsr(ym2149nzdegrees))