from django.views.generic import View
from libs import json_response, JsonParser, Argument, human_datetime
from apps.monitor.models import Detection
from django_redis import get_redis_connection
from django.conf import settings
import json


class DetectionView(View):
    def get(self, request):
        detections = Detection.objects.all()
        return json_response(detections)

    def post(self, request):
        form, error = JsonParser(
            Argument('id', type=int, required=False),
            Argument('name', help='请输入任务名称'),
            Argument('addr', help='请输入监控地址'),
            Argument('type', filter=lambda x: x in dict(Detection.TYPES), help='请选择监控类型'),
            Argument('extra', required=False),
            Argument('desc', required=False),
            Argument('rate', type=int, default=5),
            Argument('threshold', type=int, default=3),
            Argument('quiet', type=int, default=24 * 60),
            Argument('notify_grp', type=list, help='请选择报警联系组'),
            Argument('notify_mode', type=list, help='请选择报警方式'),
        ).parse(request.body)
        if error is None:
            form.notify_grp = json.dumps(form.notify_grp)
            form.notify_mode = json.dumps(form.notify_mode)
            if form.id:
                Detection.objects.filter(pk=form.id).update(
                    updated_at=human_datetime(),
                    updated_by=request.user,
                    **form)
                task = Detection.objects.filter(pk=form.id).first()
                if task and task.is_active:
                    form.action = 'modify'
                    rds_cli = get_redis_connection()
                    rds_cli.rpush(settings.MONITOR_KEY, json.dumps(form))
            else:
                Detection.objects.create(created_by=request.user, **form)
                form.action = 'add'
                rds_cli = get_redis_connection()
                rds_cli.rpush(settings.MONITOR_KEY, json.dumps(form))
        return json_response(error=error)

    def patch(self, request):
        form, error = JsonParser(
            Argument('id', type=int, help='请指定操作对象'),
            Argument('is_active', type=bool, required=False)
        ).parse(request.body, True)
        if error is None:
            Detection.objects.filter(pk=form.id).update(**form)
            if form.get('is_active') is not None:
                if form.is_active:
                    task = Detection.objects.filter(pk=form.id).first()
                    message = {'id': form.id, 'action': 'add'}
                    message.update(task.to_dict(selects=('addr', 'extra', 'rate', 'type')))
                else:
                    message = {'id': form.id, 'action': 'remove'}
                rds_cli = get_redis_connection()
                rds_cli.rpush(settings.MONITOR_KEY, json.dumps(message))
        return json_response(error=error)

    def delete(self, request):
        form, error = JsonParser(
            Argument('id', type=int, help='请指定操作对象')
        ).parse(request.GET)
        if error is None:
            task = Detection.objects.filter(pk=form.id).first()
            if task:
                if task.is_active:
                    return json_response(error='该监控项正在运行中，请先停止后再尝试删除')
                task.delete()
        return json_response(error=error)