#!/usr/bin/env python
# Wenchang Yang (wenchang@princeton.edu)
# Sun Sep 11 08:42:49 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
from cftime import DatetimeNoLeap
#
if __name__ == '__main__':
    tt.check('end import')
#
#start from here
#degK to degC for use in AM2.1
ifile = sys.argv[1]
if '.nc' in ifile:
    ofile = ifile.replace('.nc', '.degC.nc')
else:
    print('input must be nc file')
    sys.exit()

if os.path.exists(ofile) and not 'o' in sys.argv:
    print('[exists]:', ofile)
    sys.exit()
else:
    with xr.set_options(keep_attrs=True):
        ds = xr.open_dataset(ifile)
        ds['sst'] = ds['sst'] - 273.15
        ds['sst'].attrs['units'] = 'degC'
    
    print('saving...')
    #nc_encoding = {'time':{'dtype': 'double', '_FillValue': None, 'calendar': 'noleap', 'units': f'days since {years.start}-01-16 00:00:00'},
    nc_encoding = {'time':{'dtype': 'double', '_FillValue': None, 'calendar': 'noleap'},
                'lon':{'_FillValue': None},
                'lat':{'_FillValue': None},
                'sst':{'dtype': 'float32', '_FillValue': None},
                }
    ds.to_netcdf(ofile, encoding=nc_encoding, unlimited_dims='time')
    print('[saved]:', ofile)
 
 
if __name__ == '__main__':
    #from wyconfig import * #my plot settings
    
    #savefig
    if 'savefig' in sys.argv or 's' in sys.argv:
        figname = __file__.replace('.py', f'.png')
        if 'overwritefig' in sys.argv or 'o' in sys.argv:
            wysavefig(figname, overwritefig=True)
        else:
            wysavefig(figname)
    tt.check(f'**Done**')
    print()
    if 'notshowfig' in sys.argv:
        pass
    else:
        plt.show()