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#The code was authored by the following people:
#
#Jaideep Pathak - NVIDIA Corporation
#Shashank Subramanian - NERSC, Lawrence Berkeley National Laboratory
#Peter Harrington - NERSC, Lawrence Berkeley National Laboratory
#Sanjeev Raja - NERSC, Lawrence Berkeley National Laboratory 
#Ashesh Chattopadhyay - Rice University 
#Morteza Mardani - NVIDIA Corporation 
#Thorsten Kurth - NVIDIA Corporation 
#David Hall - NVIDIA Corporation 
#Zongyi Li - California Institute of Technology, NVIDIA Corporation 
#Kamyar Azizzadenesheli - Purdue University 
#Pedram Hassanzadeh - Rice University 
#Karthik Kashinath - NVIDIA Corporation 
#Animashree Anandkumar - California Institute of Technology, NVIDIA Corporation

import torch
import numpy as np
import h5py


years = [1979, 1989, 1999, 2004, 2010]

global_means = np.zeros((1,21,1,1))
global_stds = np.zeros((1,21,1,1))
time_means = np.zeros((1,21,721, 1440))

for ii, year in enumerate(years):
    
    with h5py.File('/pscratch/sd/s/shas1693/data/era5/train/'+ str(year) + '.h5', 'r') as f:

        rnd_idx = np.random.randint(0, 1460-500)
        global_means += np.mean(f['fields'][rnd_idx:rnd_idx+500], keepdims=True, axis = (0,2,3))
        global_stds += np.var(f['fields'][rnd_idx:rnd_idx+500], keepdims=True, axis = (0,2,3))

global_means = global_means/len(years)
global_stds = np.sqrt(global_stds/len(years))
time_means = time_means/len(years)

np.save('/pscratch/sd/s/shas1693/data/era5/global_means.npy', global_means)
np.save('/pscratch/sd/s/shas1693/data/era5/global_stds.npy', global_stds)
np.save('/pscratch/sd/s/shas1693/data/era5/time_means.npy', time_means)

print("means: ", global_means)
print("stds: ", global_stds)