## Copyright (C) 2012-2013  Daniel Pavel
## Copyright (C) 2014-2024  Solaar Contributors https://pwr-solaar.github.io/Solaar/
##
## This program 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 2 of the License, or
## (at your option) any later version.
##
## This program 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 this program; if not, write to the Free Software Foundation, Inc.,
## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

# Some common functions and types.

from binascii import hexlify as _hexlify
from collections import namedtuple
from dataclasses import dataclass
from typing import Optional, Union

import yaml as _yaml

from .i18n import _


def is_string(d):
    return isinstance(d, str)


#
#
#


def crc16(data: bytes):
    """
    CRC-16 (CCITT) implemented with a precomputed lookup table
    """
    table = [
        0x0000,
        0x1021,
        0x2042,
        0x3063,
        0x4084,
        0x50A5,
        0x60C6,
        0x70E7,
        0x8108,
        0x9129,
        0xA14A,
        0xB16B,
        0xC18C,
        0xD1AD,
        0xE1CE,
        0xF1EF,
        0x1231,
        0x0210,
        0x3273,
        0x2252,
        0x52B5,
        0x4294,
        0x72F7,
        0x62D6,
        0x9339,
        0x8318,
        0xB37B,
        0xA35A,
        0xD3BD,
        0xC39C,
        0xF3FF,
        0xE3DE,
        0x2462,
        0x3443,
        0x0420,
        0x1401,
        0x64E6,
        0x74C7,
        0x44A4,
        0x5485,
        0xA56A,
        0xB54B,
        0x8528,
        0x9509,
        0xE5EE,
        0xF5CF,
        0xC5AC,
        0xD58D,
        0x3653,
        0x2672,
        0x1611,
        0x0630,
        0x76D7,
        0x66F6,
        0x5695,
        0x46B4,
        0xB75B,
        0xA77A,
        0x9719,
        0x8738,
        0xF7DF,
        0xE7FE,
        0xD79D,
        0xC7BC,
        0x48C4,
        0x58E5,
        0x6886,
        0x78A7,
        0x0840,
        0x1861,
        0x2802,
        0x3823,
        0xC9CC,
        0xD9ED,
        0xE98E,
        0xF9AF,
        0x8948,
        0x9969,
        0xA90A,
        0xB92B,
        0x5AF5,
        0x4AD4,
        0x7AB7,
        0x6A96,
        0x1A71,
        0x0A50,
        0x3A33,
        0x2A12,
        0xDBFD,
        0xCBDC,
        0xFBBF,
        0xEB9E,
        0x9B79,
        0x8B58,
        0xBB3B,
        0xAB1A,
        0x6CA6,
        0x7C87,
        0x4CE4,
        0x5CC5,
        0x2C22,
        0x3C03,
        0x0C60,
        0x1C41,
        0xEDAE,
        0xFD8F,
        0xCDEC,
        0xDDCD,
        0xAD2A,
        0xBD0B,
        0x8D68,
        0x9D49,
        0x7E97,
        0x6EB6,
        0x5ED5,
        0x4EF4,
        0x3E13,
        0x2E32,
        0x1E51,
        0x0E70,
        0xFF9F,
        0xEFBE,
        0xDFDD,
        0xCFFC,
        0xBF1B,
        0xAF3A,
        0x9F59,
        0x8F78,
        0x9188,
        0x81A9,
        0xB1CA,
        0xA1EB,
        0xD10C,
        0xC12D,
        0xF14E,
        0xE16F,
        0x1080,
        0x00A1,
        0x30C2,
        0x20E3,
        0x5004,
        0x4025,
        0x7046,
        0x6067,
        0x83B9,
        0x9398,
        0xA3FB,
        0xB3DA,
        0xC33D,
        0xD31C,
        0xE37F,
        0xF35E,
        0x02B1,
        0x1290,
        0x22F3,
        0x32D2,
        0x4235,
        0x5214,
        0x6277,
        0x7256,
        0xB5EA,
        0xA5CB,
        0x95A8,
        0x8589,
        0xF56E,
        0xE54F,
        0xD52C,
        0xC50D,
        0x34E2,
        0x24C3,
        0x14A0,
        0x0481,
        0x7466,
        0x6447,
        0x5424,
        0x4405,
        0xA7DB,
        0xB7FA,
        0x8799,
        0x97B8,
        0xE75F,
        0xF77E,
        0xC71D,
        0xD73C,
        0x26D3,
        0x36F2,
        0x0691,
        0x16B0,
        0x6657,
        0x7676,
        0x4615,
        0x5634,
        0xD94C,
        0xC96D,
        0xF90E,
        0xE92F,
        0x99C8,
        0x89E9,
        0xB98A,
        0xA9AB,
        0x5844,
        0x4865,
        0x7806,
        0x6827,
        0x18C0,
        0x08E1,
        0x3882,
        0x28A3,
        0xCB7D,
        0xDB5C,
        0xEB3F,
        0xFB1E,
        0x8BF9,
        0x9BD8,
        0xABBB,
        0xBB9A,
        0x4A75,
        0x5A54,
        0x6A37,
        0x7A16,
        0x0AF1,
        0x1AD0,
        0x2AB3,
        0x3A92,
        0xFD2E,
        0xED0F,
        0xDD6C,
        0xCD4D,
        0xBDAA,
        0xAD8B,
        0x9DE8,
        0x8DC9,
        0x7C26,
        0x6C07,
        0x5C64,
        0x4C45,
        0x3CA2,
        0x2C83,
        0x1CE0,
        0x0CC1,
        0xEF1F,
        0xFF3E,
        0xCF5D,
        0xDF7C,
        0xAF9B,
        0xBFBA,
        0x8FD9,
        0x9FF8,
        0x6E17,
        0x7E36,
        0x4E55,
        0x5E74,
        0x2E93,
        0x3EB2,
        0x0ED1,
        0x1EF0,
    ]

    crc = 0xFFFF
    for byte in data:
        crc = (crc << 8) ^ table[(crc >> 8) ^ byte]
        crc &= 0xFFFF  # important, crc must stay 16bits all the way through
    return crc


class NamedInt(int):
    """A regular Python integer with an attached name.

    Caution: comparison with strings will also match this NamedInt's name
    (case-insensitive)."""

    def __new__(cls, value, name):
        assert is_string(name)
        obj = int.__new__(cls, value)
        obj.name = str(name)
        return obj

    def bytes(self, count=2):
        return int2bytes(self, count)

    def __eq__(self, other):
        if other is None:
            return False
        if isinstance(other, NamedInt):
            return int(self) == int(other) and self.name == other.name
        if isinstance(other, int):
            return int(self) == int(other)
        if is_string(other):
            return self.name.lower() == other.lower()
        # this should catch comparisons with bytes in Py3
        if other is not None:
            raise TypeError("Unsupported type " + str(type(other)))

    def __ne__(self, other):
        return not self.__eq__(other)

    def __hash__(self):
        return int(self)

    def __str__(self):
        return self.name

    def __repr__(self):
        return "NamedInt(%d, %r)" % (int(self), self.name)

    @classmethod
    def from_yaml(cls, loader, node):
        args = loader.construct_mapping(node)
        return cls(value=args["value"], name=args["name"])

    @classmethod
    def to_yaml(cls, dumper, data):
        return dumper.represent_mapping("!NamedInt", {"value": int(data), "name": data.name}, flow_style=True)


_yaml.SafeLoader.add_constructor("!NamedInt", NamedInt.from_yaml)
_yaml.add_representer(NamedInt, NamedInt.to_yaml)


class NamedInts:
    """An ordered set of NamedInt values.

    Indexing can be made by int or string, and will return the corresponding
    NamedInt if it exists in this set, or `None`.

    Extracting slices will return all present NamedInts in the given interval
    (extended slices are not supported).

    Assigning a string to an indexed int will create a new NamedInt in this set;
    if the value already exists in the set (int or string), ValueError will be
    raised.
    """

    __slots__ = ("__dict__", "_values", "_indexed", "_fallback", "_is_sorted")

    def __init__(self, dict=None, **kwargs):
        def _readable_name(n):
            if not is_string(n):
                raise TypeError("expected string, got " + str(type(n)))
            return n.replace("__", "/").replace("_", " ")

        # print (repr(kwargs))
        elements = dict if dict else kwargs
        values = {k: NamedInt(v, _readable_name(k)) for (k, v) in elements.items()}
        self.__dict__ = values
        self._is_sorted = False
        self._values = list(values.values())
        self._sort_values()
        self._indexed = {int(v): v for v in self._values}
        # assert len(values) == len(self._indexed)
        # "(%d) %r\n=> (%d) %r" % (len(values), values, len(self._indexed), self._indexed)
        self._fallback = None

    @classmethod
    def list(cls, items, name_generator=lambda x: str(x)):  # noqa: B008
        values = {name_generator(x): x for x in items}
        return NamedInts(**values)

    @classmethod
    def range(cls, from_value, to_value, name_generator=lambda x: str(x), step=1):  # noqa: B008
        values = {name_generator(x): x for x in range(from_value, to_value + 1, step)}
        return NamedInts(**values)

    def flag_names(self, value):
        unknown_bits = value
        for k in self._indexed:
            assert bin(k).count("1") == 1
            if k & value == k:
                unknown_bits &= ~k
                yield str(self._indexed[k])

        if unknown_bits:
            yield f"unknown:{unknown_bits:06X}"

    def _sort_values(self):
        self._values = sorted(self._values)
        self._is_sorted = True

    def __getitem__(self, index):
        if isinstance(index, int):
            if index in self._indexed:
                return self._indexed[int(index)]
            if self._fallback:
                value = NamedInt(index, self._fallback(index))
                self._indexed[index] = value
                self._values.append(value)
                self._is_sorted = False
                self._sort_values()
                return value

        elif is_string(index):
            if index in self.__dict__:
                return self.__dict__[index]
            return next((x for x in self._values if str(x) == index), None)

        elif isinstance(index, slice):
            values = self._values if self._is_sorted else sorted(self._values)

            if index.start is None and index.stop is None:
                return values[:]

            v_start = int(values[0]) if index.start is None else int(index.start)
            v_stop = (values[-1] + 1) if index.stop is None else int(index.stop)

            if v_start > v_stop or v_start > values[-1] or v_stop <= values[0]:
                return []

            if v_start <= values[0] and v_stop > values[-1]:
                return values[:]

            start_index = 0
            stop_index = len(values)

            for i, value in enumerate(values):
                if value < v_start:
                    start_index = i + 1
                elif index.stop is None:
                    break
                if value >= v_stop:
                    stop_index = i
                    break

            return values[start_index:stop_index]

    def __setitem__(self, index, name):
        assert isinstance(index, int), type(index)
        if isinstance(name, NamedInt):
            assert int(index) == int(name), repr(index) + " " + repr(name)
            value = name
        elif is_string(name):
            value = NamedInt(index, name)
        else:
            raise TypeError("name must be a string")

        if str(value) in self.__dict__:
            raise ValueError("%s (%d) already known" % (value, int(value)))
        if int(value) in self._indexed:
            raise ValueError("%d (%s) already known" % (int(value), value))

        self._values.append(value)
        self._is_sorted = False
        self._sort_values()
        self.__dict__[str(value)] = value
        self._indexed[int(value)] = value

    def __contains__(self, value):
        if isinstance(value, NamedInt):
            return self[value] == value
        elif isinstance(value, int):
            return value in self._indexed
        elif is_string(value):
            return value in self.__dict__ or value in self._values

    def __iter__(self):
        yield from self._values

    def __len__(self):
        return len(self._values)

    def __repr__(self):
        return f"NamedInts({', '.join(repr(v) for v in self._values)})"

    def __or__(self, other):
        return NamedInts(**self.__dict__, **other.__dict__)


class UnsortedNamedInts(NamedInts):
    def _sort_values(self):
        pass

    def __or__(self, other):
        c = UnsortedNamedInts if isinstance(other, UnsortedNamedInts) else NamedInts
        return c(**self.__dict__, **other.__dict__)


def strhex(x):
    assert x is not None
    """Produce a hex-string representation of a sequence of bytes."""
    return _hexlify(x).decode("ascii").upper()


def bytes2int(x, signed=False):
    return int.from_bytes(x, signed=signed, byteorder="big")


def int2bytes(x, count=None, signed=False):
    if count:
        return x.to_bytes(length=count, byteorder="big", signed=signed)
    else:
        return x.to_bytes(length=8, byteorder="big", signed=signed).lstrip(b"\x00")


class KwException(Exception):
    """An exception that remembers all arguments passed to the constructor.
    They can be later accessed by simple member access.
    """

    def __init__(self, **kwargs):
        super().__init__(kwargs)

    def __getattr__(self, k):
        try:
            return super().__getattr__(k)
        except AttributeError:
            return self.args[0].get(k)  # was self.args[0][k]


"""Firmware information."""
FirmwareInfo = namedtuple("FirmwareInfo", ["kind", "name", "version", "extras"])


@dataclass
class Battery:
    """Information about the current state of a battery"""

    level: Optional[Union[NamedInt, int]]
    next_level: Optional[Union[NamedInt, int]]
    status: Optional[NamedInt]
    voltage: Optional[int]
    light_level: Optional[int] = None  # light level for devices with solaar recharging

    def __post_init__(self):
        if self.level is None:  # infer level from status if needed and possible
            if self.status == Battery.STATUS.full:
                self.level = Battery.APPROX.full
            elif self.status in (Battery.STATUS.almost_full, Battery.STATUS.recharging):
                self.level = Battery.APPROX.good
            elif self.status == Battery.STATUS.slow_recharge:
                self.level = Battery.APPROX.low

    STATUS = NamedInts(
        discharging=0x00,
        recharging=0x01,
        almost_full=0x02,
        full=0x03,
        slow_recharge=0x04,
        invalid_battery=0x05,
        thermal_error=0x06,
    )

    APPROX = NamedInts(empty=0, critical=5, low=20, good=50, full=90)

    ATTENTION_LEVEL = 5

    def ok(self):
        return self.status not in (Battery.STATUS.invalid_battery, Battery.STATUS.thermal_error) and (
            self.level is None or self.level > Battery.ATTENTION_LEVEL
        )

    def charging(self):
        return self.status in (
            Battery.STATUS.recharging,
            Battery.STATUS.almost_full,
            Battery.STATUS.full,
            Battery.STATUS.slow_recharge,
        )

    def to_str(self):
        if isinstance(self.level, NamedInt):
            return _("Battery: %(level)s (%(status)s)") % {"level": _(self.level), "status": _(self.status)}
        elif isinstance(self.level, int):
            return _("Battery: %(percent)d%% (%(status)s)") % {"percent": self.level, "status": _(self.status)}
        else:
            return ""


ALERT = NamedInts(NONE=0x00, NOTIFICATION=0x01, SHOW_WINDOW=0x02, ATTENTION=0x04, ALL=0xFF)