#!/usr/bin/env python
# Wenchang Yang (wenchang@princeton.edu)
# Thu Jun 13 14:57:42 EDT 2024
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
import xesmf as xe
#
if __name__ == '__main__':
    tt.check('end import')
#
#start from here
ifile = '30000101.atmos_month.nc'
da_i = xr.open_dataset(ifile)['tau_x'].load() \
    .rename(grid_xt='lon', grid_yt='lat')
ifile = '30000101.ocean.nc'
#ds_o = xr.open_dataset(ifile)[['TS', 'SST', 'GEOLON', 'GEOLAT']].load()  \
#    .rename(xt='x', yt='y', GEOLON='lon', GEOLAT='lat')
#da_o  = ds_o['TS'].where(ds_o['TS']<0, other=ds_o['SST']) + 273.15 #surface temp: TS over ice, SST over no-ice
da_o = xr.open_dataset(ifile)['tau_x'].load() \
    .rename(xu_ocean='x', yu_ocean='y', geolon_c='lon', geolat_c='lat')
#print(da_o); sys.exit()

#regrid
regridder = xe.Regridder(da_i, da_o, 'bilinear', periodic=True)
da_r = regridder(da_i)

units = da_o.attrs['units']
 
 
if __name__ == '__main__':
    from wyconfig import * #my plot settings
    from geoplots import mapplot
    s = f'tau_x on ocean grid [{units}]'
    g = da_o.plot(x='lon', y='lat', col='time', col_wrap=4, levels=21, robust=True, figsize=(11.5,6.5), cbar_kwargs={'label': s})
    for ax in g.axes.flat:
        plt.sca(ax)
        mapplot()
        ax.set_xlabel('')
        ax.set_ylabel('')
    #savefig
    if 'savefig' in sys.argv or 's' in sys.argv:
        figname = __file__.replace('.py', f'__ocean.png')
        if 'overwritefig' in sys.argv or 'o' in sys.argv:
            wysavefig(figname, overwritefig=True)
        else:
            wysavefig(figname)
 
    #atmos tau_x has opposite sign as ocean tau_x
    s = f'regridded tau_x on ocean grid [{units}]'
    g = (-da_r).plot(x='lon', y='lat', col='time', col_wrap=4, levels=21, robust=True, figsize=(11.5,6.5), cbar_kwargs={'label': s})
    for ax in g.axes.flat:
        plt.sca(ax)
        mapplot()
        ax.set_xlabel('')
        ax.set_ylabel('')
    #savefig
    if 'savefig' in sys.argv or 's' in sys.argv:
        figname = __file__.replace('.py', f'__regridded_from_atmos.png')
        if 'overwritefig' in sys.argv or 'o' in sys.argv:
            wysavefig(figname, overwritefig=True)
        else:
            wysavefig(figname)
 
    s = f'regridded tau_x - raw tau_x on ocean grid [{units}]'
    g = (-da_r - da_o).plot(x='lon', y='lat', col='time', col_wrap=4, levels=21, robust=True, figsize=(11.5,6.5), cbar_kwargs={'label': s})
    for ax in g.axes.flat:
        plt.sca(ax)
        mapplot()
        ax.set_xlabel('')
        ax.set_ylabel('')
    #savefig
    if 'savefig' in sys.argv or 's' in sys.argv:
        figname = __file__.replace('.py', f'__bias.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()