#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Tue Jan 30 12:32:00 2018

@author: jeanluc-auge

update an existing json file with all the 96ch txt files for a given amplifier type
amplifier type 'OA_type1' is hard coded but can be modified and other types added
returns an updated amplifier json file: output_json_file_name = 'edfa_config.json'
"""
import re
import sys
import json
import numpy as np

"""amplifier file names
convert a set of amplifier files + input json definiton file into a valid edfa_json_file:
nf_fit_coeff: NF 3rd order polynomial coefficients txt file
    nf = f(dg)
    with dg = gain_operational - gain_max
nf_ripple: NF ripple excursion txt file
gain_ripple: gain ripple txt file
dgt: dynamic gain txt file
input json file in argument (defult = 'OA.json')

the json input file should have the following fields:
{
    "nf_fit_coeff": "nf_filename.txt",
    "nf_ripple": "nf_ripple_filename.txt",
    "gain_ripple": "DFG_filename.txt",
    "dgt": "DGT_filename.txt",
}

"""

input_json_file_name = "OA.json"  # default path
output_json_file_name = "default_edfa_config.json"
gain_ripple_field = "gain_ripple"
nf_ripple_field = "nf_ripple"
nf_fit_coeff = "nf_fit_coeff"


def read_file(field, file_name):
    """read and format the 96 channels txt files describing the amplifier NF and ripple
        convert dfg into gain ripple by removing the mean component
    """

    # with open(path + file_name,'r') as this_file:
    #   data = this_file.read()
    # data.strip()
    #data = re.sub(r"([0-9])([ ]{1,3})([0-9-+])",r"\1,\3",data)
    #data = list(data.split(","))
    #data = [float(x) for x in data]
    data = np.loadtxt(file_name)
    print(len(data), file_name)
    if field == gain_ripple_field or field == nf_ripple_field:
        # consider ripple excursion only to avoid redundant information
        # because the max flat_gain is already given by the 'gain_flat' field in json
        # remove the mean component
        print(file_name, ', mean value =', data.mean(), ' is substracted')
        data = data - data.mean()
    data = data.tolist()
    return data


def input_json(path):
    """read the json input file and add all the 96 channels txt files
    create the output json file with output_json_file_name"""
    with open(path, 'r') as edfa_json_file:
        amp_text = edfa_json_file.read()
    amp_dict = json.loads(amp_text)

    for k, v in amp_dict.items():
        if re.search(r'.txt$', str(v)):
            amp_dict[k] = read_file(k, v)

    amp_text = json.dumps(amp_dict, indent=4)
    # print(amp_text)
    with open(output_json_file_name, 'w') as edfa_json_file:
        edfa_json_file.write(amp_text)


if __name__ == '__main__':
    if len(sys.argv) == 2:
        path = sys.argv[1]
    else:
        path = input_json_file_name
    input_json(path)