# -*- coding: utf-8 -*-
#

from django.db.models import F
from django.db.transaction import atomic
from django.utils.translation import ugettext_lazy as _
from rest_framework import serializers

from accounts.models import Account
from accounts.serializers import AccountSerializerCreateValidateMixin
from accounts.serializers import AuthValidateMixin
from common.serializers import WritableNestedModelSerializer, SecretReadableMixin, CommonModelSerializer
from common.serializers.fields import LabeledChoiceField
from common.utils import lazyproperty, decrypt_password
from orgs.mixins.serializers import BulkOrgResourceModelSerializer
from ...const import Category, AllTypes
from ...models import Asset, Node, Platform, Label, Protocol

__all__ = [
    'AssetSerializer', 'AssetSimpleSerializer', 'MiniAssetSerializer',
    'AssetTaskSerializer', 'AssetsTaskSerializer', 'AssetProtocolsSerializer',
    'AssetDetailSerializer', 'DetailMixin', 'AssetAccountSerializer',
    'AccountSecretSerializer', 'SpecSerializer'
]


class AssetProtocolsSerializer(serializers.ModelSerializer):
    class Meta:
        model = Protocol
        fields = ['name', 'port']


class AssetLabelSerializer(serializers.ModelSerializer):
    class Meta:
        model = Label
        fields = ['id', 'name', 'value']
        extra_kwargs = {
            # 取消默认唯一键的校验
            'id': {'validators': []},
            'name': {'required': False},
            'value': {'required': False},
        }


class AssetPlatformSerializer(serializers.ModelSerializer):
    class Meta:
        model = Platform
        fields = ['id', 'name']
        extra_kwargs = {
            'name': {'required': False}
        }


class AssetAccountSerializer(
    AuthValidateMixin,
    AccountSerializerCreateValidateMixin,
    CommonModelSerializer
):
    add_org_fields = False
    push_now = serializers.BooleanField(
        default=False, label=_("Push now"), write_only=True
    )
    template = serializers.BooleanField(
        default=False, label=_("Template"), write_only=True
    )
    name = serializers.CharField(max_length=128, required=True, label=_("Name"))

    class Meta:
        model = Account
        fields_mini = [
            'id', 'name', 'username', 'privileged', 'is_active',
            'version', 'secret_type',
        ]
        fields_write_only = [
            'secret', 'push_now', 'template'
        ]
        fields = fields_mini + fields_write_only
        extra_kwargs = {
            'secret': {'write_only': True},
        }

    def validate_push_now(self, value):
        request = self.context['request']
        if not request.user.has_perms('assets.push_assetaccount'):
            return False
        return value

    def validate_name(self, value):
        if not value:
            value = self.initial_data.get('username')
        return value


class AccountSecretSerializer(SecretReadableMixin, CommonModelSerializer):
    class Meta:
        model = Account
        fields = [
            'name', 'username', 'privileged', 'secret_type', 'secret',
        ]
        extra_kwargs = {
            'secret': {'write_only': False},
        }


class SpecSerializer(serializers.Serializer):
    # 数据库
    db_name = serializers.CharField(label=_("Database"), max_length=128, required=False)
    use_ssl = serializers.BooleanField(label=_("Use SSL"), required=False)
    allow_invalid_cert = serializers.BooleanField(label=_("Allow invalid cert"), required=False)
    # Web
    autofill = serializers.CharField(label=_("Auto fill"), required=False)
    username_selector = serializers.CharField(label=_("Username selector"), required=False)
    password_selector = serializers.CharField(label=_("Password selector"), required=False)
    submit_selector = serializers.CharField(label=_("Submit selector"), required=False)
    script = serializers.JSONField(label=_("Script"), required=False)


class AssetSerializer(BulkOrgResourceModelSerializer, WritableNestedModelSerializer):
    category = LabeledChoiceField(choices=Category.choices, read_only=True, label=_('Category'))
    type = LabeledChoiceField(choices=AllTypes.choices(), read_only=True, label=_('Type'))
    labels = AssetLabelSerializer(many=True, required=False, label=_('Label'))
    protocols = AssetProtocolsSerializer(many=True, required=False, label=_('Protocols'), default=())
    accounts = AssetAccountSerializer(many=True, required=False, write_only=True, label=_('Account'))

    class Meta:
        model = Asset
        fields_mini = ['id', 'name', 'address']
        fields_small = fields_mini + ['is_active', 'comment']
        fields_fk = ['domain', 'platform']
        fields_m2m = [
            'nodes', 'labels', 'protocols',
            'nodes_display', 'accounts'
        ]
        read_only_fields = [
            'category', 'type', 'connectivity',
            'date_verified', 'created_by', 'date_created',
        ]
        fields = fields_small + fields_fk + fields_m2m + read_only_fields
        extra_kwargs = {
            'name': {'label': _("Name")},
            'address': {'label': _('Address')},
            'nodes_display': {'label': _('Node path')},
        }

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

    def _get_protocols_required_default(self):
        platform = self._initial_data_platform
        platform_protocols = platform.protocols.all()
        protocols_default = [p for p in platform_protocols if p.default]
        protocols_required = [p for p in platform_protocols if p.required or p.primary]
        return protocols_required, protocols_default

    def _set_protocols_default(self):
        if not hasattr(self, 'initial_data'):
            return
        protocols = self.initial_data.get('protocols')
        if protocols is not None:
            return

        protocols_required, protocols_default = self._get_protocols_required_default()
        protocols_data = [
            {'name': p.name, 'port': p.port}
            for p in protocols_required + protocols_default
        ]
        self.initial_data['protocols'] = protocols_data

    def _init_field_choices(self):
        request = self.context.get('request')
        if not request:
            return
        category = request.path.strip('/').split('/')[-1].rstrip('s')
        field_category = self.fields.get('category')
        field_category.choices = Category.filter_choices(category)
        field_type = self.fields.get('type')
        field_type.choices = AllTypes.filter_choices(category)

    @classmethod
    def setup_eager_loading(cls, queryset):
        """ Perform necessary eager loading of data. """
        queryset = queryset.prefetch_related('domain', 'platform') \
            .annotate(category=F("platform__category")) \
            .annotate(type=F("platform__type"))
        queryset = queryset.prefetch_related('nodes', 'labels', 'protocols')
        return queryset

    @staticmethod
    def perform_nodes_display_create(instance, nodes_display):
        if not nodes_display:
            return
        nodes_to_set = []
        for full_value in nodes_display:
            if not full_value.startswith('/'):
                full_value = '/' + instance.org.name + '/' + full_value
            node = Node.objects.filter(full_value=full_value).first()
            if node:
                nodes_to_set.append(node)
            else:
                node = Node.create_node_by_full_value(full_value)
            nodes_to_set.append(node)
        instance.nodes.set(nodes_to_set)

    @lazyproperty
    def _initial_data_platform(self):
        if self.instance:
            return self.instance.platform

        platform_id = self.initial_data.get('platform')
        if isinstance(platform_id, dict):
            platform_id = platform_id.get('id') or platform_id.get('pk')
        platform = Platform.objects.filter(id=platform_id).first()
        if not platform:
            raise serializers.ValidationError({'platform': _("Platform not exist")})
        return platform

    def validate_domain(self, value):
        platform = self._initial_data_platform
        if platform.domain_enabled:
            return value
        else:
            return None

    def validate_nodes(self, nodes):
        if nodes:
            return nodes
        request = self.context.get('request')
        if not request:
            return []
        node_id = request.query_params.get('node_id')
        if not node_id:
            return []
        nodes = Node.objects.filter(id=node_id)
        return nodes

    def is_valid(self, raise_exception=False):
        self._set_protocols_default()
        return super().is_valid(raise_exception)

    def validate_protocols(self, protocols_data):
        # 目的是去重
        protocols_data_map = {p['name']: p for p in protocols_data}
        for p in protocols_data:
            port = p.get('port', 0)
            if port < 1 or port > 65535:
                error = p.get('name') + ': ' + _("port out of range (1-65535)")
                raise serializers.ValidationError(error)

        protocols_required, protocols_default = self._get_protocols_required_default()
        protocols_not_found = [p.name for p in protocols_required if p.name not in protocols_data_map]
        if protocols_not_found:
            raise serializers.ValidationError({
                'protocols': _("Protocol is required: {}").format(', '.join(protocols_not_found))
            })
        return protocols_data_map.values()

    @staticmethod
    def accounts_create(accounts_data, asset):
        for data in accounts_data:
            data['asset'] = asset
            secret = data.get('secret')
            data['secret'] = decrypt_password(secret) if secret else secret
            AssetAccountSerializer().create(data)

    @atomic
    def create(self, validated_data):
        nodes_display = validated_data.pop('nodes_display', '')
        accounts = validated_data.pop('accounts', [])
        instance = super().create(validated_data)
        self.accounts_create(accounts, instance)
        self.perform_nodes_display_create(instance, nodes_display)
        return instance

    @atomic
    def update(self, instance, validated_data):
        if not validated_data.get('accounts'):
            validated_data.pop('accounts', None)
        nodes_display = validated_data.pop('nodes_display', '')
        instance = super().update(instance, validated_data)
        self.perform_nodes_display_create(instance, nodes_display)
        return instance


class DetailMixin(serializers.Serializer):
    accounts = AssetAccountSerializer(many=True, required=False, label=_('Accounts'))
    spec_info = serializers.DictField(label=_('Spec info'), read_only=True)
    auto_info = serializers.DictField(read_only=True, label=_('Auto info'))

    def get_field_names(self, declared_fields, info):
        names = super().get_field_names(declared_fields, info)
        names.extend([
            'accounts', 'info', 'spec_info', 'auto_info'
        ])
        return names


class AssetDetailSerializer(DetailMixin, AssetSerializer):
    pass


class MiniAssetSerializer(serializers.ModelSerializer):
    class Meta:
        model = Asset
        fields = AssetSerializer.Meta.fields_mini


class AssetSimpleSerializer(serializers.ModelSerializer):
    class Meta:
        model = Asset
        fields = [
            'id', 'name', 'address', 'port',
            'connectivity', 'date_verified'
        ]


class AssetsTaskSerializer(serializers.Serializer):
    ACTION_CHOICES = (
        ('refresh', 'refresh'),
        ('test', 'test'),
    )
    task = serializers.CharField(read_only=True)
    action = serializers.ChoiceField(choices=ACTION_CHOICES, write_only=True)
    assets = serializers.PrimaryKeyRelatedField(
        queryset=Asset.objects, required=False, allow_empty=True, many=True
    )


class AssetTaskSerializer(AssetsTaskSerializer):
    ACTION_CHOICES = tuple(list(AssetsTaskSerializer.ACTION_CHOICES) + [
        ('push_system_user', 'push_system_user'),
        ('test_system_user', 'test_system_user')
    ])
    action = serializers.ChoiceField(choices=ACTION_CHOICES, write_only=True)
    asset = serializers.PrimaryKeyRelatedField(
        queryset=Asset.objects, required=False, allow_empty=True, many=False
    )
    accounts = serializers.PrimaryKeyRelatedField(
        queryset=Account.objects, required=False, allow_empty=True, many=True
    )