#!/usr/bin/env python
# Wenchang Yang (wenchang@princeton.edu)
# Wed May 26 19:43:41 EDT 2021
#get MDR/TROP sst time series from global sst data on regular lon/lat grids (lon range 0-360)
if __name__ == '__main__':
    from misc.timer import Timer
    tt = Timer(f'start {__file__}')
import sys, os.path, os, glob, datetime
import xarray as xr, numpy as np, pandas as pd, matplotlib.pyplot as plt
#more imports
import geoxarray
#
if __name__ == '__main__':
    tt.check('end import')
#
#start from here
def sst2mdrtrop(sst):
    """get MDR/TROP sst time series from global sst data on regular lon/lat grids (lon range 0-360)"""
    #mdr sst
    #print('MDR...')
    MDR = sst.sel(lat=slice(10,25), lon=slice(280,340)) \
        .groupby('time.year').mean('time') \
        .geo.fldmean() #MDR region: 10-25N, 80-20W
    if MDR.max() > 200:
        units = 'K'
    else:
        units = '$^\circ$C'
    MDR.attrs['units'] = units
    MDR.attrs['long_name'] = 'MDR SST'
    #trop sst
    #print('TROP...')
    TROP = sst.sel(lat=slice(-30,30)) \
        .groupby('time.year').mean('time') \
        .geo.fldmean() #TROP region: 30S-30N
    TROP.attrs['units'] = units
    TROP.attrs['long_name'] = 'TROP SST'
    #dataset
    ds = xr.Dataset(dict(MDR=MDR, TROP=TROP))

    return ds
 
if __name__ == '__main__':
    #from wyconfig import * #my plot settings
    ifile = sys.argv[1]#e.g. ts.ocean.past1000.0850-1849.maxmissing150.ens10.nc
    ofile = ifile.replace('ocean', 'mdrtrop') 
    if os.path.exists(ofile):
        print('[exists]:', ofile)
        sys.exit()
    print('loading...')
    with xr.open_dataset(ifile) as ds:
        glbattrs = ds.attrs
    da = xr.open_dataarray(ifile).load()
    sst = da
    ds = sst2mdrtrop(sst)
    ds.attrs = glbattrs
    print('saving...')
    ds.to_netcdf(ofile)
    print('[saved]:', ofile)
    
    #savefig
    if 'savefig' in sys.argv:
        figname = __file__.replace('.py', f'.png')
        wysavefig(figname)
    tt.check(f'**Done**')
    plt.show()