#!/usr/bin/env Python3
import numpy as np
from pdb import set_trace
import matplotlib.pyplot as plt
from matplotlib.ticker import FormatStrFormatter
from matplotlib.colors import LogNorm
import time
import sys
sys.path.insert(0, '/Users/joost/Dropbox/Werk/PhD/Documents/Published/FourierOptics GitHub release/')
from fourierOptics import *

'''
	2022-08-02: I don't understand the relation between the name of this script
	and what happens within. It does seem to simulate a broadband PSF. And there's
	also a phaseTilt function defined. Probably, I was testing out small phase tilts
	to shift the PSF off-axis.
'''


def phaseTilt(x,y,tx,ty):
	phaseTilt = x * np.tan(np.deg2rad(tx)) + y * np.tan(np.deg2rad(ty))
	return phaseTilt

if __name__ == '__main__':
	plt.rc('font', family='serif')
	plt.rc('axes', labelsize='large')

	# Start time counter
	start = time.time()

	lList = [30e-3, 32.5e-3, 35e-3, 37.5e-3, 40e-3]
	Exyz_list = []
	# Pick a wavelength
	l = 30e-3

	for l in lList:
		# Initiate Fourier Optics
		fou = FourierOptics(l=l)
		
		# Pick sampling parameters
		dpix = 1/20
		n, m = 2001, 2001
		print ('Your resolution is {}x{} with a pixel size of {}'.format(n,m,dpix))
		
		# Initiate the profiles class and pick a profile (tophat, obscured tophat or spider)
		prof = Profiles()
		A = prof.top_hat(2.5, n, m, dpix=dpix, oversample=1)
		# A = prof.ELT_pupil(n,m,dpix)
		plt.imshow(np.abs(A))
		
		# Create an input grid
		x, y = np.meshgrid(np.linspace(-n/2*dpix, n/2*dpix, n), np.linspace(-m/2*dpix, m/2*dpix, m))


		# Create a lens with a focal length ~100 mm, with a clear aperture radius of 4 mm and thickness of 1 mm.
		L1 = SphericalLens('N-BK7', thickness=5, R1=100, R2=300, CA=5, name='L1')
		print('Focal length of lens {} is {:.1f} mm.'.format(L1.name, L1.f))

		# L1.add_wavefront_error(phaseTilt(x,y,tx=0,ty=2.5))

		# Calculate the phase delay introduced by the lens
		t_l = L1.phase_delay(x,y,l, paraxial=False)
		U_in = A * t_l
		
		# Performing the propagation using Fresnel approximation to the focal plane.
		oC = [x.min(), x.max(), y.min(), y.max()]
		# oC = [0,x.max(),0,y.max()]
		savename = False
		Exyz_og,_,_ = fou.fresnel_propagation(U_in, x, y, dz=L1.f, show=True, save=savename, outputCoordinates=oC)
		Exyz_list.append(Exyz_og)

	Exyz = np.asarray(Exyz_list).sum(axis=0)
	plt.imshow(np.abs(Exyz), cmap='hot');plt.colorbar();plt.show()