import logging

from django.utils.translation import gettext as _
from rest_framework.response import Response
from rest_framework.permissions import IsAdminUser

from pingcap_sso.api.base import AdminEndpoint
from pingcap_sso.api.permissions import MethodPermission
from pingcap_sso.models import (
    SiteSettingDB, SiteSetting, MetaSiteSetting
)

logger = logging.getLogger(__name__)


class SettingEndpoint(AdminEndpoint):

    permission_classes = (IsAdminUser, MethodPermission)
    perms_map = {
        'GET': ['pingcap_sso.view_sitesettingdb'],
        'PUT': ['pingcap_sso.change_sitesettingdb']
    }

    def get(self, request, *args, **kwargs):
        """audit_log: 查看了站点设置"""
        registered_settings = MetaSiteSetting.REGISTERED_SETTINGS
        data = {}
        for name, data_type in registered_settings.items():
            value = getattr(SiteSetting, name)
            try:
                _db_instance = SiteSettingDB.objects.get(name=name, data_type=data_type)
                if not _db_instance.display_at_admin_frontend:
                    continue
            except SiteSettingDB.DoesNotExist:
                logger.error('SiteSetting({}) not exists'.format(name))
            data[name] = {
                'name': name,
                'value': self._encode_as_html_display(value, data_type),
                'data_type': data_type
            }
        return Response({
            'detail': _('success'),
            'data': data
        })

    def _encode_as_html_display(self, value, data_type):
        if data_type == SiteSettingDB.TYPE_STR_LIST:
            return '\n'.join(value)
        else:
            return value

    def put(self, request, *args, **kwargs):
        """audit_log: 修改了站点设置"""
        setting_name = request.data['name']
        setting_value = request.data['value']
        data_type = MetaSiteSetting.REGISTERED_SETTINGS[setting_name]
        if data_type == SiteSettingDB.TYPE_STR_LIST:
            setting_value = list(map(lambda x: x.strip(), (
                filter(lambda x: x, setting_value.split('\n')))))
        elif data_type == SiteSettingDB.TYPE_STR:
            pass
        elif data_type == SiteSettingDB.TYPE_INTEGER:
            setting_value = int(setting_value)
        else:
            raise Exception('Unsupported')

        setattr(SiteSetting, setting_name, setting_value)
        return Response({
            'detail': _('success')
        })