#!/usr/bin/env python
# Wenchang Yang (wenchang@princeton.edu)
# Mon Nov 18 17:32:17 EST 2024
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
#ifile = 'VI_HIRAM_amipLMR2019SST0850ic_tigercpu_intelmpi_18_540PE_ens01_0850-1999.nc'
#ifile = 'VI_HIRAM_amipHadISSTlongChancorr_tigercpu_intelmpi_18_540PE_extend2019-2021_5ens_1871-2021.nc'
#ifile = 'VI_AM2.5C360_amipHadISSTrcp45_tigercpu_intelmpi_18_1080PE_ens16_1871-2100.nc'
#ifile = 'VI_AM2.5C360_amipHadISSTrcp45_tigercpu_intelmpi_18_1080PE_ens17_1871-2100.nc'
ifile = 'VI_AM2.5C360_amipHadISSTrcp45_tigercpu_intelmpi_18_1080PE_ens18_1871-2100.nc'
print('ifile:', ifile)
ofile = ifile.replace('VI', 'pvi')
print('ofile:', ofile)
if os.path.exists(ofile) and 'od' not in sys.argv:
    print('[exists]:', ofile)
    sys.exit()

def vi2p(vi):
    """calculate TC transition probablity from ventilation index (VI) based on Tang and Emanual 2012 paper"""
    vi0 = 0.014
    n = np.log(9)/np.log(0.1/0.014)
    p = 1/(1 + (vi/vi0)**n)
    return p
 

#calc TC transition probability from VI
print('loading...')
vi = xr.open_dataarray(ifile).load()
print('calculating...')
pvi = vi2p(vi).assign_attrs(long_name='TC transition probability')
ds = pvi.to_dataset(name='pvi')

#save
print('saving...')
encoding = {'pvi': {'zlib': True, 'complevel': 1}}
ds.to_netcdf(ofile, encoding=encoding)
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()