#!/usr/bin/env python
# Wenchang Yang (wenchang@princeton.edu)
# Fri Jun 20 10:45:39 AM EDT 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
from misc.landmask import whereland
from geoplots.cartopy.api import cartoplot, cartoproj
#
if __name__ == '__main__':
    try:
        tt.check('end import')
    except:
        pass
#
#start from here
daname = 'mn2t'
daname_new = 'Tmin'
years = range(1979, 2024+1)
ifiles = [f'/projects/w/wenchang/data/era5/analysis_wy/2m_temperature_min/monthly/era5.2m_temperature_min.monthly.{year}.nc'
    for year in years]
print('dataset openning...')
ds = xr.open_mfdataset(ifiles)
print('data loading...')
da = ds[daname].load()

def wyplot(ax=None, **kws): 
    vmax, vmin = 40, -40
    proj = cartoproj('robin')
    if ax is None:
        ax = plt.axes(projection=proj)
    da_ = da.groupby('time.year').min().mean('year').pipe(whereland) - 273.15
    da_.attrs['units'] = 'degC'
    da_.name = daname_new
    #da_.plot(center=False)
    #da_.pipe(cartoplot, center=False)
    im = da_.plot(ax=ax, center=False, transform=cartoproj('cyl'), vmax=vmax, vmin=vmin, extend='both', **kws)

    title = f'ERA5 annual min tas averaged over {years[0]}-{years[-1]}'
    ax.set_title(title, loc='center')

    return im
 
if __name__ == '__main__':
    from wyconfig import * #my plot settings
    wyplot()
    
    #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()