###########################################################################
#
# Copyright (c) 2019-2021 Diality Inc. - All Rights Reserved.
#
# THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
# WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
#
# @file    utils.py
#
# @author  (last)        LTTS 
# @date    (last)      08-July-2022
#
############################################################################

import os
import csv
import test
from configuration import config
from datetime import timezone
from datetime import datetime


def get_current_date_and_time_in_utc(date_format='%Y/%m/%d - %H:%M:%S'):
    """
        Method to get current date and time.
        @input date_format (str) - format of date to be retrieved.
        @return (str) - date in specified format.
    """
    date = datetime.now(timezone.utc)
    return str(date.strftime(date_format))

def append_cloudsync_credentials_file():
    """
        This function is the handler for getting file from log folder. 
        Application log file is automatically created on '/home/denali/Desktop/sd-card/cloudsync/ {current_date}_out.log'
        @return latest_file - (string) returns latest file that append on log folder from sd-data 
    """
    try:
        os.makedirs(config.CLOUD_CREDENTIALS_LOCATION, exist_ok = True)
        test.log("Directory created successfully")
        for file_handler in range(len(config.PEM_FILES)):
            path = os.path.join(config.CLOUD_CREDENTIALS_LOCATION, config.PEM_FILES[file_handler]) 
            with open(path, 'w') as file_reader:
                pass
        
    except OSError as error:
        test.log("Directory  can not be created")
        
def get_cloud_sync_input_file():
    """
        This function is the handler for getting file from log folder. 
        Application log file is automatically created on '/home/denali/Desktop/sd-card/cloudsync/ {current_date}_inp.log'
        @return latest_file - (string) returns latest file that append on log folder from sd-data 
    """
    try:
        current_date = get_current_date_and_time_in_utc(date_format = "%Y_%m_%d")
        latest_file = config.INP_BUF_FILE_LOCATION+current_date+'_inp.buf'
        return latest_file
    except:
        return False 
    
def retrive_log_data(readline_count = 1):
    """
        This function is the handler for getting file from log folder. 
        Application log data is automatically appended on '/home/denali/Desktop/sd-card/cloudsync/ {current_date}_out.log'
        @return latest_file - (list) returns latest file that append on log folder from sd-data 
    """
    cloudsync_data = []
    count = 0
    file_name = get_cloud_sync_input_file()
   
    try:
        with open(file_name,mode = 'r') as filereader:
            contents = csv.reader(filereader)
            try:        
                for reader in reversed(list(contents)): 
                    if  readline_count == count:
                        return cloudsync_data   
                    cloudsync_data.append(reader)          
                    count = count + 1
            except:
                test.fail("application log data is corrupted")         
    except:
        test.fail("Log file is not created or log file is not created based on standard log naming format.")
        
def get_epoch_value_consistancy(current_epoch_value, expected_epoch_value):
    """
        This function is verify consistancy of epoch value.
        @input current_epoch_value (float) - current epoch time
        @input expected_epoch_value (str) - epoch time from the cloud-sync log.
        @return (bool) - True/False
    """
    expected_epoch_value = int(expected_epoch_value)
    maximum_epoch_value = int(current_epoch_value + 25)
    minimum_epoch_value = int(current_epoch_value - 25)
    
    if expected_epoch_value > minimum_epoch_value and expected_epoch_value < maximum_epoch_value :
        return True
    return False