# Copyright 2016 Egor Tensin <Egor.Tensin@gmail.com>
# This file is licensed under the terms of the MIT License.
# See LICENSE.txt for details.

from collections import OrderedDict
from collections.abc import Hashable, Mapping, MutableMapping
from datetime import datetime, timezone
from enum import Enum
from numbers import Real, Integral
import re

class UserField(Enum):
    UID = 'uid'
    FIRST_NAME = 'first_name'
    LAST_NAME = 'last_name'
    SCREEN_NAME = 'screen_name'
    ONLINE = 'online'
    LAST_SEEN = 'last_seen'

    def __str__(self):
        return self.value

class LastSeenField(Enum):
    TIME = 'time'
    PLATFORM = 'platform'

    def __str__(self):
        return self.value

class Platform(Enum):
    MOBILE = 1
    IPHONE = 2
    IPAD = 3
    ANDROID = 4
    WINDOWS_PHONE = 5
    WINDOWS8 = 6
    WEB = 7

    def from_string(s):
        return Platform(int(s))

    def __str__(self):
        return str(self.value)

    @staticmethod
    def _uppercase_first_letter(s):
        m = re.search(r'\w', s)
        if m is None:
            return s
        return s[:m.start()] + m.group().upper() + s[m.end():]

    def get_description_for_header(self):
        return self._uppercase_first_letter(_PLATFORM_DESCRIPTIONS[self])

    def get_description_for_sentence(self):
        s = _PLATFORM_DESCRIPTIONS[self]
        s = s.replace('unrecognized', 'an unrecognized')
        return 'the ' + s

    def get_description_for_sentence_beginning(self):
        return self._uppercase_first_letter(self.get_description_for_sentence())

_PLATFORM_DESCRIPTIONS = {
    Platform.MOBILE: '"mobile" web version (or unrecognized mobile app)',
    Platform.IPHONE: 'official iPhone app',
    Platform.IPAD: 'official iPad app',
    Platform.ANDROID: 'official Android app',
    Platform.WINDOWS_PHONE: 'official Windows Phone app',
    Platform.WINDOWS8: 'official Windows 8 app',
    Platform.WEB: 'web version (or unrecognized app)'
}

class LastSeen(MutableMapping):
    @staticmethod
    def from_api_response(source):
        instance = LastSeen()
        for field in LastSeenField:
            if str(field) in source:
                instance[field] = source[str(field)]
        return instance

    def __init__(self, fields=None):
        if fields is None:
            fields = OrderedDict()
        self._fields = fields

    def __getitem__(self, field):
        return self._fields[field]

    def __setitem__(self, field, value):
        self._fields[field] = self.parse(field, value)

    def __delitem__(self, field):
        del self._fields[field]

    def __iter__(self):
        return iter(self._fields)

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

    @staticmethod
    def parse(field, value):
        if field in LastSeen._FIELD_PARSERS:
            return LastSeen._FIELD_PARSERS[field](value)
        else:
            return LastSeen._DEFAULT_FIELD_PARSER(value)

    def _parse_time(x):
        if isinstance(x, datetime):
            if x.tzinfo is None or x.tzinfo.utcoffset(x) is None:
                x = x.replace(tzinfo=timezone.utc)
            return x
        elif isinstance(x, Real) or isinstance(x, Integral):
            return datetime.fromtimestamp(x, tz=timezone.utc)
        else:
            raise TypeError()

    def _parse_platform(x):
        if x in Platform:
            return x
        if isinstance(x, str):
            return Platform.from_string(x)
        else:
            return Platform(x)

    _FIELD_PARSERS = {
        LastSeenField.TIME: _parse_time,
        LastSeenField.PLATFORM: _parse_platform,
    }

    _DEFAULT_FIELD_PARSER = str

    def has_time(self):
        return LastSeenField.TIME in self

    def get_time(self):
        return self[LastSeenField.TIME]

    def set_time(self, t):
        self[LastSeenField.TIME] = t

    def has_platform(self):
        return LastSeenField.PLATFORM in self

    def get_platform(self):
        return self[LastSeenField.PLATFORM]

    def set_platform(self, platform):
        self[LastSeenField.PLATFORM] = platform

class User(Hashable, MutableMapping):
    @staticmethod
    def from_api_response(source):
        instance = User()
        for field in UserField:
            if str(field) in source:
                instance[field] = source[str(field)]
        return instance

    def __init__(self, fields=None):
        if fields is None:
            fields = OrderedDict()
        self._fields = fields

    def __eq__(self, other):
        return self.get_uid() == other.get_uid()
        #return self._fields == other._fields

    def __hash__(self, fields=None):
        return hash(self.get_uid())

    def __getitem__(self, field):
        return self._fields[field]

    def __setitem__(self, field, value):
        self._fields[field] = self.parse(field, value)

    def __delitem__(self, field):
        del self._fields[field]

    def __iter__(self):
        return iter(self._fields)

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

    @staticmethod
    def parse(field, value):
        if field in User._FIELD_PARSERS:
            return User._FIELD_PARSERS[field](value)
        else:
            return User._DEFAULT_FIELD_PARSER(value)

    def _parse_last_seen(x):
        if isinstance(x, LastSeen):
            return x
        elif isinstance(x, Mapping):
            return LastSeen.from_api_response(x)
        else:
            raise TypeError()

    def _parse_bool(x):
        if isinstance(x, str):
            if str(True) == x:
                return True
            elif str(False) == x:
                return False
            else:
                raise ValueError()
        else:
            return bool(x)

    _FIELD_PARSERS = {
        UserField.UID: int,
        UserField.ONLINE: _parse_bool,
        UserField.LAST_SEEN: _parse_last_seen,
    }

    _DEFAULT_FIELD_PARSER = str

    def get_uid(self):
        return self[UserField.UID]

    def get_first_name(self):
        return self[UserField.FIRST_NAME]

    def set_first_name(self, name):
        self[UserField.FIRST_NAME] = name

    def has_last_name(self):
        return UserField.LAST_NAME in self and self.get_last_name()

    def get_last_name(self):
        return self[UserField.LAST_NAME]

    def set_last_name(self, name):
        self[UserField.LAST_NAME] = name

    def has_screen_name(self):
        return UserField.SCREEN_NAME in self

    def get_screen_name(self):
        if self.has_screen_name():
            return self[UserField.SCREEN_NAME]
        else:
            return 'id' + str(self.get_uid())

    def set_screen_name(self, name):
        self[UserField.SCREEN_NAME] = name

    def has_online_flag(self):
        return UserField.ONLINE in self

    def is_online(self):
        return self[UserField.ONLINE]

    def is_offline(self):
        return not self.is_online()

    def set_online_flag(self, value=True):
        self[UserField.ONLINE] = value

    def has_last_seen(self):
        return UserField.LAST_SEEN in self

    def get_last_seen(self):
        return self[UserField.LAST_SEEN]

    def set_last_seen(self, last_seen):
        self[UserField.LAST_SEEN] = last_seen

    def get_last_seen_time(self):
        return self[UserField.LAST_SEEN].get_time()

    def get_last_seen_time_local(self):
        return self[UserField.LAST_SEEN].get_time().astimezone()

    def get_last_seen_platform(self):
        return self[UserField.LAST_SEEN].get_platform()