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

from django.conf import settings
from django.contrib.auth.models import AbstractUser, UserManager as _UserManager
from django.db import models
from django.shortcuts import reverse
from django.utils import timezone
from django.utils.translation import gettext_lazy as _
from rest_framework.exceptions import PermissionDenied

from common.db import fields, models as jms_models
from common.utils import (
    date_expired_default,
    get_logger,
)
from labels.mixins import LabeledMixin
from orgs.utils import current_org
from ._auth import AuthMixin, MFAMixin
from ._json import JSONFilterMixin
from ._role import RoleMixin, SystemRoleManager, OrgRoleManager
from ._source import SourceMixin, Source
from ._token import TokenMixin

logger = get_logger(__file__)
__all__ = [
    "User",
    "UserPasswordHistory",
    "MFAMixin",
    "AuthMixin"
]


class UserManager(_UserManager):
    def get_by_natural_key(self, username_or_mail):
        q = models.Q(username=username_or_mail) | models.Q(email=username_or_mail)
        user = self.filter(q).first()
        if not user:
            raise self.model.DoesNotExist
        return user


class User(
    AuthMixin,
    SourceMixin,
    TokenMixin,
    RoleMixin,
    MFAMixin,
    LabeledMixin,
    JSONFilterMixin,
    AbstractUser,
):
    id = models.UUIDField(default=uuid.uuid4, primary_key=True)
    username = models.CharField(max_length=128, unique=True, verbose_name=_("Username"))
    name = models.CharField(max_length=128, verbose_name=_("Name"))
    email = models.EmailField(max_length=128, unique=True, verbose_name=_("Email"))
    groups = models.ManyToManyField(
        "users.UserGroup",
        related_name="users",
        blank=True,
        verbose_name=_("User group"),
    )
    role = models.CharField(
        default="User", max_length=10, blank=True, verbose_name=_("Role")
    )
    is_service_account = models.BooleanField(
        default=False, verbose_name=_("Is service account")
    )
    avatar = models.ImageField(upload_to="avatar", null=True, verbose_name=_("Avatar"))
    wechat = fields.EncryptCharField(
        max_length=128, blank=True, verbose_name=_("Wechat")
    )
    phone = fields.EncryptCharField(
        max_length=128, blank=True, null=True, verbose_name=_("Phone")
    )
    mfa_level = models.SmallIntegerField(
        default=0, choices=MFAMixin.MFA_LEVEL_CHOICES, verbose_name=_("MFA")
    )
    otp_secret_key = fields.EncryptCharField(
        max_length=128, blank=True, null=True, verbose_name=_("OTP secret key")
    )
    # Todo: Auto generate key, let user download
    private_key = fields.EncryptTextField(
        blank=True, null=True, verbose_name=_("Private key")
    )
    public_key = fields.EncryptTextField(
        blank=True, null=True, verbose_name=_("Public key")
    )
    comment = models.TextField(blank=True, null=True, verbose_name=_("Comment"))
    is_first_login = models.BooleanField(default=True, verbose_name=_("Is first login"))
    date_expired = models.DateTimeField(
        default=date_expired_default,
        blank=True,
        null=True,
        db_index=True,
        verbose_name=_("Date expired"),
    )
    created_by = models.CharField(
        max_length=30, default="", blank=True, verbose_name=_("Created by")
    )
    updated_by = models.CharField(
        max_length=30, default="", blank=True, verbose_name=_("Updated by")
    )
    date_password_last_updated = models.DateTimeField(
        auto_now_add=True,
        blank=True,
        null=True,
        verbose_name=_("Date password last updated"),
    )
    need_update_password = models.BooleanField(
        default=False, verbose_name=_("Need update password")
    )
    source = models.CharField(
        max_length=30,
        default=Source.local,
        choices=Source.choices,
        verbose_name=_("Source"),
    )
    wecom_id = models.CharField(
        null=True, default=None, max_length=128, verbose_name=_("WeCom")
    )
    dingtalk_id = models.CharField(
        null=True, default=None, max_length=128, verbose_name=_("DingTalk")
    )
    feishu_id = models.CharField(
        null=True, default=None, max_length=128, verbose_name=_("FeiShu")
    )
    lark_id = models.CharField(
        null=True, default=None, max_length=128, verbose_name="Lark"
    )
    slack_id = models.CharField(
        null=True, default=None, max_length=128, verbose_name=_("Slack")
    )
    date_api_key_last_used = models.DateTimeField(
        null=True, blank=True, verbose_name=_("Date api key used")
    )
    date_updated = models.DateTimeField(auto_now=True, verbose_name=_("Date updated"))
    objects = UserManager()
    DATE_EXPIRED_WARNING_DAYS = 5

    def __str__(self):
        return "{0.name}({0.username})".format(self)

    @classmethod
    def get_queryset(cls):
        queryset = cls.objects.all()
        if not current_org.is_root():
            queryset = current_org.get_members()
        queryset = queryset.exclude(is_service_account=True)
        return queryset

    @property
    def secret_key(self):
        instance = self.preferences.filter(name="secret_key").first()
        if not instance:
            return
        return instance.decrypt_value

    @property
    def receive_backends(self):
        try:
            return self.user_msg_subscription.receive_backends
        except:
            return []

    @property
    def is_otp_secret_key_bound(self):
        return bool(self.otp_secret_key)

    def get_absolute_url(self):
        return reverse("users:user-detail", args=(self.id,))

    @property
    def is_expired(self):
        if self.date_expired and self.date_expired < timezone.now():
            return True
        else:
            return False

    def is_password_authenticate(self):
        cas = self.Source.cas
        saml2 = self.Source.saml2
        oauth2 = self.Source.oauth2
        return self.source not in [cas, saml2, oauth2]

    @property
    def expired_remain_days(self):
        date_remain = self.date_expired - timezone.now()
        return date_remain.days

    @property
    def will_expired(self):
        if 0 <= self.expired_remain_days <= self.DATE_EXPIRED_WARNING_DAYS:
            return True
        else:
            return False

    @property
    def lang(self):
        return self.preference.get_value("lang")

    @lang.setter
    def lang(self, value):
        self.preference.set_value('lang', value)

    @property
    def preference(self):
        from users.models.preference import PreferenceManager
        return PreferenceManager(self)

    @property
    def is_valid(self):
        if self.is_active and not self.is_expired:
            return True
        return False

    def set_required_attr_if_need(self):
        if not self.name:
            self.name = self.username
        if not self.email or "@" not in self.email:
            email = "{}@{}".format(self.username, settings.EMAIL_SUFFIX)
            if "@" in self.username:
                email = self.username
            self.email = email

    def save(self, *args, **kwargs):
        self.set_required_attr_if_need()
        if self.username == "admin":
            self.role = "Admin"
            self.is_active = True
        return super().save(*args, **kwargs)

    def is_member_of(self, user_group):
        if user_group in self.groups.all():
            return True
        return False

    def set_avatar(self, f):
        self.avatar.save(self.username, f)

    @classmethod
    def get_avatar_url(cls, username):
        user_default = settings.STATIC_URL + "img/avatar/user.png"
        return user_default

    def avatar_url(self):
        admin_default = settings.STATIC_URL + "img/avatar/admin.png"
        user_default = settings.STATIC_URL + "img/avatar/user.png"
        if self.avatar:
            return self.avatar.url
        if self.is_superuser:
            return admin_default
        else:
            return user_default

    def unblock_login(self):
        from users.utils import LoginBlockUtil, MFABlockUtils

        LoginBlockUtil.unblock_user(self.username)
        MFABlockUtils.unblock_user(self.username)

    @property
    def login_blocked(self):
        from users.utils import LoginBlockUtil, MFABlockUtils

        if LoginBlockUtil.is_user_block(self.username):
            return True
        if MFABlockUtils.is_user_block(self.username):
            return True
        return False

    def delete(self, using=None, keep_parents=False):
        if self.pk == 1 or self.username == "admin":
            raise PermissionDenied(_("Can not delete admin user"))
        return super(User, self).delete(using=using, keep_parents=keep_parents)

    class Meta:
        ordering = ["username"]
        verbose_name = _("User")
        unique_together = (
            ("dingtalk_id",),
            ("wecom_id",),
            ("feishu_id",),
            ("lark_id",),
            ("slack_id",),
        )
        permissions = [
            ("invite_user", _("Can invite user")),
            ("remove_user", _("Can remove user")),
            ("match_user", _("Can match user")),
        ]

    def can_send_created_mail(self):
        if self.email and self.source == self.Source.local.value:
            return True
        return False


class UserPasswordHistory(models.Model):
    id = models.UUIDField(default=uuid.uuid4, primary_key=True)
    password = models.CharField(max_length=128)
    user = models.ForeignKey(
        "users.User",
        related_name="history_passwords",
        on_delete=jms_models.CASCADE_SIGNAL_SKIP,
        verbose_name=_("User"),
    )
    date_created = models.DateTimeField(
        auto_now_add=True, verbose_name=_("Date created")
    )

    def __str__(self):
        return f"{self.user} set at {self.date_created}"

    def __repr__(self):
        return self.__str__()

    class Meta:
        verbose_name = _("User password history")