#!/usr/bin/env python
# Wenchang Yang (wenchang@princeton.edu)
# Tue Feb 18 04:26:56 PM EST 2025
if __name__ == '__main__':
    import sys,os
    try:
        from misc.timer import Timer
        tt = Timer(f'[{os.getcwd()}] start ' + ' '.join(sys.argv))
    except:
        pass
import sys, os.path, os, glob, datetime
import xarray as xr, numpy as np, pandas as pd, matplotlib.pyplot as plt
#more imports
wython = '/tigress/wenchang/wython'
if wython not in sys.path: sys.path.append(wython); print('added to python path:', wython)
#from misc import get_kws_from_argv
#
if __name__ == '__main__':
    try:
        tt.check('end import')
    except:
        pass
#
#start from here
print('u200...')
ifiles = '/projects/w/wenchang/data/era5/analysis_wy/plevels/u200/daily/era5.u200.daily.*.nc'
u200 = xr.open_mfdataset(ifiles)['u']

print('u850...')
ifiles = '/projects/w/wenchang/data/era5/analysis_wy/plevels/u850/daily/era5.u850.daily.*.nc'
u850 = xr.open_mfdataset(ifiles)['u']
 
print('v200...')
ifiles = '/projects/w/wenchang/data/era5/analysis_wy/plevels/v200/daily/era5.v200.daily.*.nc'
v200 = xr.open_mfdataset(ifiles)['v']

print('v850...')
ifiles = '/projects/w/wenchang/data/era5/analysis_wy/plevels/v850/daily/era5.v850.daily.*.nc'
v850 = xr.open_mfdataset(ifiles)['v']

#time-mean
ofile = f'era5.wind_shear.daily.1979-2020.dayofyear.nc'
if os.path.exists(ofile): 
    print('[exists]:', ofile)
else:
    print('wind_shear...')
    wind_shear = ((u200-u850)**2 + (v200 - v850)**2)**0.5
    print('wind_shear_mean...')
    wind_shear_mean = wind_shear.groupby('time.dayofyear').mean('time')
    print('wind_shear_mean save...')
    wind_shear_mean.to_dataset(name='wind_shear_mean').to_netcdf(ofile)
    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)
 
    try:
        tt.check(f'**Done**')
    except:
        pass
    print()
    if 'notshowfig' in sys.argv or 'n' in sys.argv:
        pass
    else:
        if 'plt' in globals(): plt.show()