# Create your tasks here
from __future__ import absolute_import, unicode_literals
from apps.utils.tasks import CustomTask
from celery import shared_task
from apps.utils.sql import DbConnection
from server.settings import get_sysconfig
from django.core.cache import cache
from apps.enm.models import Mrecord, Mpoint, HourStat
import datetime

def get_current_and_previous_hour():
    now = datetime.datetime.now()
    current_hour = now.hour
    current_date = now.date()
    
    current_start_time = datetime.datetime.combine(current_date, datetime.time(current_hour, 0, 0))
    current_end_time = datetime.datetime.combine(current_date, datetime.time(current_hour, 59, 59))
    current_time_range = (current_start_time, current_end_time)
    
    previous_hour = current_hour - 1 if current_hour > 0 else 23
    previous_date = current_date if previous_hour < current_hour else current_date - datetime.timedelta(days=1)
    
    previous_start_time = datetime.datetime.combine(previous_date, datetime.time(previous_hour, 0, 0))
    previous_end_time = datetime.datetime.combine(previous_date, datetime.time(previous_hour, 59, 59))
    previous_time_range = (previous_start_time, previous_end_time)
    
    return current_time_range, previous_time_range

@shared_task(base=CustomTask)
def get_tag_val():
    config = get_sysconfig()
    with DbConnection(config['enm']['db_host'], config['enm']['db_user'], config['enm']['db_password'], config['enm']['db_database']) as cursor:
        last_tag_id = cache.get('last_tag_id')
        if last_tag_id is None:
            mr = Mrecord.objects.all().order_by('-tag_update', 'tag_id').first()
            if mr is None:
                last_tag_id = 0
            else:
                last_tag_id = mr.tag_id
                cache.set('last_tag_id', last_tag_id)
        cursor.execute("select id, val, tag_code, update_time from tag_value where id > %s order by id", (last_tag_id))
        results = cursor.fetchall()  # 获取数据后保存至本地
        for row in results:
            mr_one = Mrecord()
            mr_one.tag_id, mr_one.tag_val, mr_one.tag_code, mr_one.tag_update = row
            mr_one.mpoint, _  = Mpoint.objects.get_or_create(code=mr_one.tag_code, defaults={'name': mr_one.tag_code, 'code': mr_one.tag_code, 'unit': 'unknown'})
            mr_one.save()

@shared_task(base=CustomTask)
def cal_hourstat():
    """
    计算小时统计量,默认计算本小时和上小时
    """
    for mpoint in Mpoint.objects.all():
        c_t_r, p_t_r = get_current_and_previous_hour()
        if mpoint.cate == 'elec':  # 是否是电能
            # 计算本小时,可能不需要
            start_time = c_t_r[0]
            params = {'mpoint': mpoint}
            params['year'], params['month'], params['day'], params['hour'] = start_time.year, start_time.month, start_time.day, start_time.hour
            mrs = Mrecord.objects.filter(mpoint=mpoint, tag_update__gte=c_t_r[0], tag_update__lte=c_t_r[1]).order_by('tag_update')
            val = 0
            if mrs.exists():
                val = mrs.last() - mrs.first()
            hs, _ = HourStat.objects.get_or_create(**params, defaults=params)
            hs.val = val
            hs.save()

            # 计算上小时
            start_time2 = p_t_r[0]
            params = {'mpoint': mpoint}
            params['year'], params['month'], params['day'], params['hour'] = start_time2.year, start_time2.month, start_time2.day, start_time2.hour
            hs, _ = HourStat.objects.get_or_create(**params, defaults=params)
            if not hs.is_calculated:
                mrs = Mrecord.objects.filter(mpoint=mpoint, tag_update__gte=p_t_r[0], tag_update__lte=p_t_r[1]).order_by('tag_update')
                val = 0
                if mrs.exists():
                    val = mrs.last() - mrs.first()
                hs.val = val
                hs.is_calculated = True
                hs.save()