#!/usr/bin/env python
# Wenchang Yang (wenchang@princeton.edu)
# Wed May 11 11:39:24 EDT 2022
if __name__ == '__main__':
    import sys
    from misc.timer import Timer
    tt = Timer('start ' + ' '.join(sys.argv))
import sys, os.path, os, glob, datetime
import xarray as xr, numpy as np, pandas as pd, matplotlib.pyplot as plt
#more imports
#
if __name__ == '__main__':
    tt.check('end import')
#
#start from here
ii = None
args_ens = [arg for arg in sys.argv if arg.startswith('ens=')]
if args_ens:
    ii = int(args_ens[-1].split('=')[-1])
daname = 'gmst_smoothed' if 'smoothed' in sys.argv else 'gmst'
ifile = 't_surf_FLOR_HistRCP45_tigercpu_intelmpi_18_576PE_5ens_1860-2100_glbmean_yearly.nc'
#ifile = 't_surf_AM2.5C360_amipHadISSTlong_chancorr_tigercpu_intelmpi_18_1080PE_10ens_1871-2021_glbmean_yearly.nc'
daname_old = 't_surf'
units = 'degC'
ofile = ifile.replace(daname_old, 'wwa_'+daname).replace('_glbmean_yearly', '_yearly')
if ii is not None: ofile = ofile.replace('.nc', f'_ens{ii}.nc')
if os.path.exists(ofile):
    da = xr.open_dataarray(ofile)
    print('[loaded]:', ofile)
else:
    da = xr.open_dataarray(ifile)
    time = [datetime.datetime(year, 6, 30) for year in da.year.values]
    #year->time; anomaly from 1951-1980; 5-year rolling average; units degC
    da = da.rename(year='time').assign_coords(time=time) \
        .pipe(lambda x: x - x.sel(time=slice('1951', '1980')).mean('time')) 
    if daname == 'gmst_smoothed':
        da = da.rolling(time=5, min_periods=1).mean()
    da = da.assign_attrs(units=units) \
        .transpose('time', 'ens')

    if ii is not None:
        da = da.sel(ens=slice(ii,ii))

    print('saving...')
    encoding = {daname: {'_FillValue': None}}
    da.to_dataset(name=daname).to_netcdf(ofile, encoding=encoding)
    print('[saved]:', ofile)
 
 
if __name__ == '__main__':
    #from wyconfig import * #my plot settings
    
    #savefig
    if len(sys.argv)>1 and 'savefig' in sys.argv[1:]:
        figname = __file__.replace('.py', f'.png')
        if 'overwritefig' in sys.argv[1:]:
            wysavefig(figname, overwritefig=True)
        else:
            wysavefig(figname)
    tt.check(f'**Done**')
    print()
    if 'notshowfig' in sys.argv:
        pass
    else:
        plt.show()