from apps.utils.serializers import CustomModelSerializer
from apps.utils.constants import EXCLUDE_FIELDS_BASE, EXCLUDE_FIELDS_DEPT
from .models import Drain, DrainEquip, EnvData, VehicleAccess, CarWash
from apps.em.serializers import EquipmentSerializer
from rest_framework import serializers
from django.utils import timezone
from datetime import datetime
from apps.utils.sql import query_all_dict


class DrainSerializer(CustomModelSerializer):
    """Serializer for Drain model"""
    mgroup_name = serializers.CharField(source='mgroup.name', read_only=True)

    class Meta:
        model = Drain
        fields = "__all__"
        read_only_fields = EXCLUDE_FIELDS_DEPT

    def validate(self, attrs):
        attrs['belong_dept'] = attrs['mgroup'].belong_dept
        return super().validate(attrs)


class Drain2Serializer(CustomModelSerializer):
    equip_data = serializers.SerializerMethodField()
    mgroup_name = serializers.CharField(source='mgroup.name', read_only=True)

    class Meta:
        model = Drain
        fields = "__all__"
        read_only_fields = EXCLUDE_FIELDS_DEPT

    def get_equip_data(self, obj):
        equips = obj.equipments.all()
        now = datetime.now()
        today = str(now)[:10]+' 00:00:00'
        today_last = str(now)[:10]+' 23:59:59'
        odata = equips.values('id', 'name', 'type',
                              'is_online', 'running_state')
        eids = [f"'{e['id']}'" for e in odata]
        eids_str = ','.join(eids)
        sql_str = f'''
SELECT
	equipment_id,
	AVG ( tsp ) AS avg_tsp,
	SUM ( duration_online ) AS total_duration_online,
	SUM ( duration_run ) AS total_duration_run,
	SUM ( duration_standby ) AS total_duration_standby,
	MAX ( last_running_state ) AS last_running_state 
FROM
	(
	SELECT
		equipment_id,
		tsp,
		running_state,
	CASE
			
			WHEN is_online = 1 THEN
			TIME - LAG ( TIME ) OVER ( PARTITION BY equipment_id ORDER BY TIME ) ELSE'0' 
		END AS duration_online,
	CASE
			
			WHEN running_state = 10 THEN
			TIME - LAG ( TIME ) OVER ( PARTITION BY equipment_id ORDER BY TIME ) ELSE'0' 
		END AS duration_run,
	CASE
			
			WHEN running_state = 20 THEN
			TIME - LAG ( TIME ) OVER ( PARTITION BY equipment_id ORDER BY TIME ) ELSE'0' 
		END AS duration_standby,
	CASE
			
			WHEN ROW_NUMBER ( ) OVER ( PARTITION BY equipment_id ORDER BY TIME DESC ) = 1 THEN
			running_state ELSE NULL 
		END AS last_running_state 
	FROM
		enp_envdata 
	WHERE
		running_state IN ( 10, 20 ) 
		AND TIME >= '{today}' -- 替换成想查询的开始时间
		
		AND TIME <= '{today_last}' -- 替换成想查询的结束时间
		
		AND equipment_id IN ( {eids_str} ) 
	) AS durations 
GROUP BY
	equipment_id;
        '''
        res = query_all_dict(sql_str)
        data = {}
        for i in res:
            data[i['equipment_id']] = i

        for i in odata:
            i.update(data.get(i['id'], {
                "avg_tsp": None,
                "total_duration_online": 0,
                "total_duration_run": 0,
                "total_duration_standby": 0,
                "last_running_state": 50,
            }))

        return odata


class DrainEquipSerializer(CustomModelSerializer):
    equipment_type = serializers.CharField(
        source='equipment.type', read_only=True)
    equipment_name = serializers.CharField(
        source='equipment.name', read_only=True)

    class Meta:
        model = DrainEquip
        fields = "__all__"
        read_only_fields = EXCLUDE_FIELDS_BASE


class EnvDataSerializer(CustomModelSerializer):
    """Serializer for EnvData model"""

    class Meta:
        model = EnvData
        fields = "__all__"


class DrainEquipEnvSerializer(CustomModelSerializer):
    equipment_number = serializers.CharField(
        source='equipment.number', read_only=True)
    equipment_type = serializers.CharField(
        source='equipment.type', read_only=True)
    equipment_name = serializers.CharField(
        source='equipment.name', read_only=True)
    equipment_envdata = serializers.SerializerMethodField()
    equipment_ = EquipmentSerializer(source='equipment', read_only=True)
    drain_ = DrainSerializer(source='drain', read_only=True)

    def get_equipment_envdata(self, obj):
        now = timezone.now()
        now_10_before = now - timezone.timedelta(minutes=10)
        obj = EnvData.objects.filter(
            equipment=obj.equipment, time__gte=now_10_before, time__lte=now).order_by('-time').first()
        if obj:
            return EnvDataSerializer(instance=obj).data
        else:
            return {}

    class Meta:
        model = DrainEquip
        fields = "__all__"


class VehicleAccessSerializer(CustomModelSerializer):
    """Serializer for VehicleAccess model"""
    class Meta:
        model = VehicleAccess
        fields = "__all__"
        read_only_fields = EXCLUDE_FIELDS_BASE


class EnvDataExportSerializer(serializers.Serializer):
    time = serializers.DateTimeField(label='时间')
    type = serializers.ChoiceField(
        label='导出类型', choices=['hour', 'day', 'week', 'month', 'season', 'year'])


class CarWashSerializer(CustomModelSerializer):
    station_name = serializers.CharField(source='station.name', read_only=True)

    class Meta:
        model = CarWash
        fields = "__all__"