from app.main.model.logs import Logs
from datetime import datetime, timedelta


def _make_pipeline(serial_number, log_number,
                   register, start_date, end_date, aggregate_by):
    pipeline = [
        {'$project':
            {
                'serialNumber': 1,
                'meterLogNumber': 1,
                'mediciones': 1,
                'logDate': 1,
                'hour': {
                    '$hour': {
                        '$dateFromString':  {'dateString': '$logDate'}
                    }
                },
                'day': {
                    '$dayOfMonth': {
                        '$dateFromString':  {'dateString': '$logDate'}
                    }
                },
                'month': {
                    '$month': {
                        '$dateFromString':  {'dateString': '$logDate'}
                    }
                },
                'year': {
                    '$year': {
                        '$dateFromString':  {'dateString': '$logDate'}
                    }
                },
            }
         },
        {'$unwind': '$mediciones'},
        {'$match': {
            'serialNumber': serial_number,
            'meterLogNumber': int(log_number),
            "mediciones.registro": register,
            'logDate': {'$gte': start_date, '$lt': end_date}}},
        {'$group':
            {
                '_id': aggregate_by,
                'date': {'$min': '$logDate'},
                'total_energy': {'$sum': {'$toInt': "$mediciones.lectura"}}
            }
         },
        {'$sort': {'date': -1}},
        {'$project': {'date': 1, 'total_energy': 1, '_id': 0}}
    ]

    return pipeline


def get_total_wh_by_day(serial_number, log_number, start_date, end_date=None):
    """Get total energy Wh by day

    :serial_number: string object
    :log_number: string object
    :date: string object

    """
    log = Logs.objects(serialNumber=serial_number,
                       meterLogNumber=log_number,
                       logDate=start_date + " 00:00:00")

    if not log:
        return {
            'error': 'No existe informacion para el medidor, log o fecha'
        }

    register = 4999

    aggregate_by = {
        'hour': None,
        'day': '$day',
        'month': None,
        'year': None
    }
    if end_date is None:
        date_dt = datetime.strptime(start_date, "%Y-%m-%d")
        delta = timedelta(days=1)
        end_date_dt = date_dt + delta
        end_date = end_date_dt.strftime("%Y-%m-%d")

    pipeline = _make_pipeline(
        serial_number, log_number, register, start_date,
        end_date, aggregate_by)
    return {'success': [log for log in Logs.objects.aggregate(*pipeline)]}


def get_hourly_wh_by_day(serial_number, log_number, start_date, end_date):
    """Get hourly energy Wh by day

    :serial_number: string object
    :log_number: string object
    :date: string object

    """
    log = Logs.objects(serialNumber=serial_number,
                       meterLogNumber=log_number,
                       logDate=start_date + " 00:00:00")

    if not log:
        return {'error': 'No existe información para el medidor, log o fecha'}

    register = 4999

    aggregate_by = {
        'hour': '$hour',
        'day': '$day',
        'month': None,
        'year': None
    }

    if end_date is None:
        date_dt = datetime.strptime(start_date, "%Y-%m-%d")
        delta = timedelta(days=1)
        end_date_dt = date_dt + delta
        end_date = end_date_dt.strftime("%Y-%m-%d")

    pipeline = _make_pipeline(
        serial_number, log_number, register, start_date,
        end_date, aggregate_by)
    print(pipeline)
    return {'success': [log for log in Logs.objects.aggregate(*pipeline)]}