# -*- coding: utf-8 -*-
#
from django.utils import timezone
from rest_framework import serializers

from common.utils import get_object_or_none
from users.models import User
from assets.models import Asset, SystemUser, Gateway, Domain, CommandFilterRule
from applications.models import Application
from users.serializers import UserProfileSerializer
from assets.serializers import ProtocolsField
from perms.serializers.base import ActionsField
from .models import AccessKey

__all__ = [
    'AccessKeySerializer', 'OtpVerifySerializer', 'BearerTokenSerializer',
    'MFAChallengeSerializer', 'SSOTokenSerializer',
    'ConnectionTokenSerializer', 'ConnectionTokenSecretSerializer',
    'PasswordVerifySerializer', 'MFASelectTypeSerializer',
]


class AccessKeySerializer(serializers.ModelSerializer):
    class Meta:
        model = AccessKey
        fields = ['id', 'secret', 'is_active', 'date_created']
        read_only_fields = ['id', 'secret', 'date_created']


class OtpVerifySerializer(serializers.Serializer):
    code = serializers.CharField(max_length=6, min_length=6)


class PasswordVerifySerializer(serializers.Serializer):
    password = serializers.CharField()


class BearerTokenSerializer(serializers.Serializer):
    username = serializers.CharField(allow_null=True, required=False, write_only=True)
    password = serializers.CharField(write_only=True, allow_null=True,
                                     required=False, allow_blank=True)
    public_key = serializers.CharField(write_only=True, allow_null=True,
                                       allow_blank=True, required=False)
    token = serializers.CharField(read_only=True)
    keyword = serializers.SerializerMethodField()
    date_expired = serializers.DateTimeField(read_only=True)
    user = UserProfileSerializer(read_only=True)

    @staticmethod
    def get_keyword(obj):
        return 'Bearer'

    def update_last_login(self, user):
        user.last_login = timezone.now()
        user.save(update_fields=['last_login'])

    def get_request_user(self):
        request = self.context.get('request')
        if request.user and request.user.is_authenticated:
            user = request.user
        else:
            user_id = request.session.get('user_id')
            user = get_object_or_none(User, pk=user_id)
            if not user:
                raise serializers.ValidationError(
                    "user id {} not exist".format(user_id)
                )
        return user

    def create(self, validated_data):
        request = self.context.get('request')
        user = self.get_request_user()

        token, date_expired = user.create_bearer_token(request)
        self.update_last_login(user)

        instance = {
            "token": token,
            "date_expired": date_expired,
            "user": user
        }
        return instance


class MFASelectTypeSerializer(serializers.Serializer):
    type = serializers.CharField()
    username = serializers.CharField(required=False, allow_blank=True, allow_null=True)


class MFAChallengeSerializer(serializers.Serializer):
    type = serializers.CharField(write_only=True, required=False, allow_blank=True)
    code = serializers.CharField(write_only=True)

    def create(self, validated_data):
        pass

    def update(self, instance, validated_data):
        pass


class SSOTokenSerializer(serializers.Serializer):
    username = serializers.CharField(write_only=True)
    login_url = serializers.CharField(read_only=True)
    next = serializers.CharField(write_only=True, allow_blank=True, required=False, allow_null=True)


class ConnectionTokenSerializer(serializers.Serializer):
    user = serializers.CharField(max_length=128, required=False, allow_blank=True)
    system_user = serializers.CharField(max_length=128, required=True)
    asset = serializers.CharField(max_length=128, required=False)
    application = serializers.CharField(max_length=128, required=False)

    @staticmethod
    def validate_user(user_id):
        from users.models import User
        user = User.objects.filter(id=user_id).first()
        if user is None:
            raise serializers.ValidationError('user id not exist')
        return user

    @staticmethod
    def validate_system_user(system_user_id):
        from assets.models import SystemUser
        system_user = SystemUser.objects.filter(id=system_user_id).first()
        if system_user is None:
            raise serializers.ValidationError('system_user id not exist')
        return system_user

    @staticmethod
    def validate_asset(asset_id):
        from assets.models import Asset
        asset = Asset.objects.filter(id=asset_id).first()
        if asset is None:
            raise serializers.ValidationError('asset id not exist')
        return asset

    @staticmethod
    def validate_application(app_id):
        from applications.models import Application
        app = Application.objects.filter(id=app_id).first()
        if app is None:
            raise serializers.ValidationError('app id not exist')
        return app

    def validate(self, attrs):
        asset = attrs.get('asset')
        application = attrs.get('application')
        if not asset and not application:
            raise serializers.ValidationError('asset or application required')
        if asset and application:
            raise serializers.ValidationError('asset and application should only one')
        return super().validate(attrs)


class ConnectionTokenUserSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ['id', 'name', 'username', 'email']


class ConnectionTokenAssetSerializer(serializers.ModelSerializer):
    protocols = ProtocolsField(label='Protocols', read_only=True)

    class Meta:
        model = Asset
        fields = ['id', 'hostname', 'ip', 'protocols', 'org_id']


class ConnectionTokenSystemUserSerializer(serializers.ModelSerializer):
    class Meta:
        model = SystemUser
        fields = ['id', 'name', 'username', 'password', 'private_key', 'protocol', 'ad_domain', 'org_id']


class ConnectionTokenGatewaySerializer(serializers.ModelSerializer):
    class Meta:
        model = Gateway
        fields = ['id', 'ip', 'port', 'username', 'password', 'private_key']


class ConnectionTokenRemoteAppSerializer(serializers.Serializer):
    program = serializers.CharField()
    working_directory = serializers.CharField()
    parameters = serializers.CharField()


class ConnectionTokenApplicationSerializer(serializers.ModelSerializer):
    attrs = serializers.JSONField(read_only=True)

    class Meta:
        model = Application
        fields = ['id', 'name', 'category', 'type', 'attrs', 'org_id']


class ConnectionTokenDomainSerializer(serializers.ModelSerializer):
    gateways = ConnectionTokenGatewaySerializer(many=True, read_only=True)

    class Meta:
        model = Domain
        fields = ['id', 'name', 'gateways']


class ConnectionTokenFilterRuleSerializer(serializers.ModelSerializer):

    class Meta:
        model = CommandFilterRule
        fields = [
            'id', 'type', 'content', 'ignore_case', 'pattern',
            'priority', 'action',
            'date_created',
        ]


class ConnectionTokenSecretSerializer(serializers.Serializer):
    id = serializers.CharField(read_only=True)
    secret = serializers.CharField(read_only=True)
    type = serializers.ChoiceField(choices=[('application', 'Application'), ('asset', 'Asset')])
    user = ConnectionTokenUserSerializer(read_only=True)
    asset = ConnectionTokenAssetSerializer(read_only=True)
    remote_app = ConnectionTokenRemoteAppSerializer(read_only=True)
    application = ConnectionTokenApplicationSerializer(read_only=True)
    system_user = ConnectionTokenSystemUserSerializer(read_only=True)
    cmd_filter_rules = ConnectionTokenFilterRuleSerializer(many=True)
    domain = ConnectionTokenDomainSerializer(read_only=True)
    gateway = ConnectionTokenGatewaySerializer(read_only=True)
    actions = ActionsField()
    expired_at = serializers.IntegerField()