#!/usr/bin/env python
# Wenchang Yang (wenchang@princeton.edu)
# Wed May 11 11:39:24 EDT 2022
# convert monthly gmst to wwa-version yearly gmst
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
daname = 'gmst_smoothed' if 'smoothed' in sys.argv else 'gmst'
#ifile = 'gmst_FLOR_HistRCP45_tigercpu_intelmpi_18_576PE_10ens_1860-2100_yearly.nc'
#ifile = 'gmst_AM2.5C360_amipHadISSTrcp45_tigercpu_intelmpi_18_1080PE_3ens_1871-2050_yearly.nc'
#ifile = 't_surf_AM2.5C360_amipHadISSTlong_chancorr_tigercpu_intelmpi_18_1080PE_10ens_1871-2021_glbmean_yearly.nc'
ifile = '../t_surf_AM2.5C360_amipHadISSTrcp45_tigercpu_intelmpi_18_1080PE_3ens_1871-2100_glbmean.nc'
print(f'{ifile = }')
units = 'degC'
ofile = ifile.replace('../t_surf', 'wwa_'+daname).replace('glbmean', 'yearly')
print(f'{ofile = }')
if os.path.exists(ofile):
    da = xr.open_dataarray(ofile)
    print('[loaded]:', ofile)
else:
    da = xr.open_dataarray(ifile)
    da = da.groupby('time.year').mean('time', keep_attrs=True) #monthly to yearly
    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, center=True).mean()
    da = da.assign_attrs(units=units) \
        .transpose('time', 'ens')

    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()