# coding=utf-8
"""
用户组视图
基于 system_manage.UserGroup 提供批量授权 API
"""
from django.utils.translation import gettext as _
from rest_framework.request import Request
from rest_framework.views import APIView

from common.auth import TokenAuth
from common.exception.app_exception import AppApiException
from common.result import result
from system_manage.models.chat_user import UserGroup, UserGroupRelation, ResourceChatUserGroupAuthorize
from users.models.user import User


class UserGroupView(APIView):
    """用户组管理"""
    authentication_classes = [TokenAuth]

    class List(APIView):
        """获取用户组列表"""
        authentication_classes = [TokenAuth]

        def get(self, request: Request, workspace_id: str):
            groups = UserGroup.objects.all()
            data = [{
                'id': str(g.id),
                'name': g.name,
                'member_count': UserGroupRelation.objects.filter(group=g).count(),
                'auth_count': ResourceChatUserGroupAuthorize.objects.filter(user_group=g).count(),
            } for g in groups]

            return result.success(data)

    class Create(APIView):
        """创建用户组"""
        authentication_classes = [TokenAuth]

        def post(self, request: Request, workspace_id: str):
            name = request.data.get('name', '')

            if not name:
                raise AppApiException(400, _('用户组名称不能为空'))

            if UserGroup.objects.filter(name=name).exists():
                raise AppApiException(400, _('用户组名称已存在'))

            group = UserGroup.objects.create(name=name)

            return result.success({
                'id': str(group.id),
                'name': group.name,
            })

    class Operate(APIView):
        """用户组操作（获取/更新/删除）"""
        authentication_classes = [TokenAuth]

        def get(self, request: Request, workspace_id: str, group_id: str):
            try:
                group = UserGroup.objects.get(id=group_id)
            except UserGroup.DoesNotExist:
                raise AppApiException(404, _('用户组不存在'))

            # 获取成员列表
            relations = UserGroupRelation.objects.filter(group=group)
            member_list = [{
                'id': str(r.user_id),
                'username': r.user.username if r.user else '',
                'nick_name': r.user.nick_name if r.user else '',
            } for r in relations if r.user]

            # 获取授权列表
            auths = ResourceChatUserGroupAuthorize.objects.filter(user_group=group)
            auth_list = [{
                'id': str(a.id),
                'resource_type': a.resource_type,
                'resource_id': str(a.resource_id),
                'is_auth': a.is_auth,
            } for a in auths]

            return result.success({
                'id': str(group.id),
                'name': group.name,
                'members': member_list,
                'authorizations': auth_list,
            })

        def put(self, request: Request, workspace_id: str, group_id: str):
            try:
                group = UserGroup.objects.get(id=group_id)
            except UserGroup.DoesNotExist:
                raise AppApiException(404, _('用户组不存在'))

            name = request.data.get('name')
            if name is not None:
                if UserGroup.objects.filter(name=name).exclude(id=group_id).exists():
                    raise AppApiException(400, _('用户组名称已存在'))
                group.name = name
                group.save()

            return result.success({
                'id': str(group.id),
                'name': group.name,
            })

        def delete(self, request: Request, workspace_id: str, group_id: str):
            try:
                group = UserGroup.objects.get(id=group_id)
            except UserGroup.DoesNotExist:
                raise AppApiException(404, _('用户组不存在'))

            # 删除关联数据
            UserGroupRelation.objects.filter(group=group).delete()
            ResourceChatUserGroupAuthorize.objects.filter(user_group=group).delete()
            group.delete()

            return result.success(True)

    class BatchAddMembers(APIView):
        """批量添加用户组成员"""
        authentication_classes = [TokenAuth]

        def post(self, request: Request, workspace_id: str, group_id: str):
            try:
                group = UserGroup.objects.get(id=group_id)
            except UserGroup.DoesNotExist:
                raise AppApiException(404, _('用户组不存在'))

            user_ids = request.data.get('user_ids', [])
            if not user_ids:
                raise AppApiException(400, _('用户ID列表不能为空'))

            added_count = 0
            for user_id in user_ids:
                try:
                    user = User.objects.get(id=user_id)
                    _, created = UserGroupRelation.objects.get_or_create(
                        group=group,
                        user=user
                    )
                    if created:
                        added_count += 1
                except User.DoesNotExist:
                    continue

            return result.success({'added_count': added_count})

    class BatchRemoveMembers(APIView):
        """批量移除用户组成员"""
        authentication_classes = [TokenAuth]

        def post(self, request: Request, workspace_id: str, group_id: str):
            try:
                group = UserGroup.objects.get(id=group_id)
            except UserGroup.DoesNotExist:
                raise AppApiException(404, _('用户组不存在'))

            user_ids = request.data.get('user_ids', [])
            if not user_ids:
                raise AppApiException(400, _('用户ID列表不能为空'))

            removed_count = UserGroupRelation.objects.filter(
                group=group,
                user_id__in=user_ids
            ).delete()[0]

            return result.success({'removed_count': removed_count})

    class BatchAuthorize(APIView):
        """批量授权用户组资源"""
        authentication_classes = [TokenAuth]

        def post(self, request: Request, workspace_id: str, group_id: str):
            try:
                group = UserGroup.objects.get(id=group_id)
            except UserGroup.DoesNotExist:
                raise AppApiException(404, _('用户组不存在'))

            authorizations = request.data.get('authorizations', [])
            if not authorizations:
                raise AppApiException(400, _('授权列表不能为空'))

            added_count = 0
            for auth in authorizations:
                resource_type = auth.get('resource_type')
                resource_id = auth.get('resource_id')
                is_auth = auth.get('is_auth', True)

                if not resource_type or not resource_id:
                    continue

                _, created = ResourceChatUserGroupAuthorize.objects.update_or_create(
                    user_group=group,
                    resource_type=resource_type,
                    resource_id=resource_id,
                    defaults={
                        'workspace_id': workspace_id,
                        'is_auth': is_auth
                    }
                )
                if created:
                    added_count += 1

            return result.success({'added_count': added_count})

    class BatchRevokeAuthorization(APIView):
        """批量撤销用户组授权"""
        authentication_classes = [TokenAuth]

        def post(self, request: Request, workspace_id: str, group_id: str):
            try:
                group = UserGroup.objects.get(id=group_id)
            except UserGroup.DoesNotExist:
                raise AppApiException(404, _('用户组不存在'))

            auth_ids = request.data.get('auth_ids', [])
            if not auth_ids:
                raise AppApiException(400, _('授权ID列表不能为空'))

            removed_count = ResourceChatUserGroupAuthorize.objects.filter(
                user_group=group,
                id__in=auth_ids
            ).delete()[0]

            return result.success({'removed_count': removed_count})