#!/usr/bin/env python
# Wenchang Yang (wenchang@princeton.edu)
# Tue Oct 31 15:24:39 EDT 2023
if __name__ == '__main__':
    import sys,os
    from misc.timer import Timer
    tt = Timer(f'[{os.getcwd()}] 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
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
from misc.seasons import sel_season
from misc.landmask import whereland
#
if __name__ == '__main__':
    tt.check('end import')
#
#start from here
season = 'JAS'
func_es = lambda T: 6.109*np.exp(17.625*T/(T+243.04)) #units: hPa
func_vpd = lambda es,rh: es*(1-rh/100)

ifile = 't_ref_AM2.5C360_amipHadISSTrcp45_tigercpu_intelmpi_18_1080PE_ens06_1980-2020_atmos_daily.region.230_270_20_50.nc'
print('loading...', ifile)
da = xr.open_dataarray(ifile).load().pipe(sel_season, season)
da = (da - 273.15).assign_attrs(units='decC') #K to C
T = da
ifile = 'rh_ref_AM2.5C360_amipHadISSTrcp45_tigercpu_intelmpi_18_1080PE_ens06_1980-2020_atmos_daily.region.230_270_20_50.nc'
print('loading...', ifile)
da = xr.open_dataarray(ifile).load().pipe(sel_season, season)
RH = da
print('es...', ifile)
es = func_es(T).assign_attrs(units='hPa')
print('vpd...', ifile)
es = func_es(T).assign_attrs(units='hPa')
vpd = func_vpd(es, RH).assign_attrs(units='hPa')
vpd_1980to2019 = vpd.sel(time=slice('1980', '2019')).mean('time', keep_attrs=True)
vpd_diff = vpd.sel(time=slice('2010', '2019')).mean('time') - vpd.sel(time=slice('1980', '1999')).mean('time')
vpd_diff.attrs['units'] = 'hPa'
 
if __name__ == '__main__':
    from wyconfig import * #my plot settings
    from geoplots import mapplot
    figsize = 4.5,4
    fig,ax = plt.subplots(figsize=figsize)
    da = vpd_1980to2019.pipe(whereland)
    da.plot(ax=ax, levels=np.arange(0, 51, 10), cmap='YlOrBr')
    mapplot(ax=ax)
    ax.set_title('AM2.5C360 JAS VPD, 1980-2019,\n ens06')
    ax.set_xlabel('')
    ax.set_ylabel('')
    ax.set_xlim(360-125, 360-95)
    ax.set_ylim(25, 50)
    
    #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)

    fig,ax = plt.subplots(figsize=figsize)
    da = vpd_diff.pipe(whereland)
    da.plot(ax=ax, levels=np.arange(-6, 6.1, 2), cmap='Spectral_r', extend='both')
    mapplot(ax=ax)
    ax.set_title('AM2.5C360 JAS VPD diff,\n 2010-2019 minus 1980-1999, ens06')
    ax.set_xlabel('')
    ax.set_ylabel('')
    ax.set_xlim(360-125, 360-95)
    ax.set_ylim(25, 50)

    #savefig
    if 'savefig' in sys.argv or 's' in sys.argv:
        figname = __file__.replace('.py', f'__diff.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 or 'n' in sys.argv:
        pass
    else:
        if 'plt' in globals(): plt.show()