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#!/usr/bin/env python
import calendar
from ecmwfapi import ECMWFDataServer
server = ECMWFDataServer()

def retrieve_uerra_eswi():
    """      
       A function to demonstrate how to iterate efficiently over several years and months etc    
       for a particular UERRA request for origin SHMI.     
       Change the variables below to adapt the iteration to your needs.
       You can use the variable 'target' to organise the requested data in files as you wish.
       In the example below the data are organised in files per month. (eg "uerra_eswi_daily_201510.grb")
    """
    yearStart = 2008
    yearEnd = 2009
    monthStart = 1
    monthEnd = 12
    for year in list(range(yearStart, yearEnd + 1)):
        for month in list(range(monthStart, monthEnd + 1)):
            startDate = '%04d%02d%02d' % (year, month, 1)
            numberOfDays = calendar.monthrange(year, month)[1]
            lastDate = '%04d%02d%02d' % (year, month, numberOfDays)
            target = "uerra_eswi_daily_%04d%02d.grb" % (year, month)
            requestDates = (startDate + "/TO/" + lastDate)
            uerra_eswi_request(requestDates, target)

def uerra_eswi_request(requestDates, target):
    """      
        A UERRA request for origin SHMI, for analysis pressure level data.
        Change the keywords below to adapt it to your needs.
        (eg to add or to remove  levels, parameters, times etc)
        Request cost per day is XXXX fields, XXXX Mbytes
    """
    server.retrieve({
        "class": "ur",
        "stream": "oper",
        "type": "an",
        "dataset": "uerra",
        "origin" : "eswi",
        "date": requestDates,
        "expver": "prod",
        "levtype": "pl",
        "levelist": "1000",
        "param": "130.128",
        "target": target,
        "time": "00/06/12/18",
        "grid": "0.75/0.75"
    })

if __name__ == '__main__':
    retrieve_uerra_eswi()