"""
OTA updater for ESP32 running Micropython by David Flory
Tutorial: https://randomnerdtutorials.com/esp32-esp8266-micropython-ota-updates

A simple program to demonstrate OTA update functionality in conjunction with main.py
The program can be as simple or complicated as you like, but must contain these functions.
The variable 'url' should be the full web address to the location of the update file and the PHP script which
returns it. below is the PHP script, named 'get_ESP_data.php'.

<?php
$file = $_GET['file'];
$dir = getcwd();
$file = $dir.'/'.$file;
$myfile = fopen($file, "r") or die("FAIL");
echo file_get_contents($file);
fclose($myfile);
?>

"""
import urequests
from utime import sleep
#The URL to use to get updates, full path to the PHP script. The update file must be in the same
#directory as the PHP script.
#### Updated name of update files to program1, program2, program3 etc. The number denotes something
#### like a version number. As this is the very first program, saved via USB, it is version 1 so the
#### next will be version 2
upd_url="http://192.168.1.2/get_ESP_data.php?file=program2.py"
### no longer used as we will not delete the files
#del_url = "http://192.168.1.XXX/delete_ESP_data.php?file=program.py"

def check_for_updates(OTA):
    try:
        #print ('Checking for updates')
        response = urequests.get(upd_url)
        x = response.text.find("FAIL")
        if x > 15:
            OTA = 1
            print('There is an update available')
            return(OTA)
        else:
            print('There are no updates available.')
            return(OTA)

    except:
        print('unable to reach internet')
        return(OTA)


def mainprog(OTA):
    print('Mainprog - OTA is' + str(OTA))
    #This is the entry point for your program code

    ## we no longer delete the files so comment out the next line
    #response = urequests.get(del_url)
    print('Program start')
    while OTA == 0:
        program_tasks()
        OTA = check_for_updates(OTA)
        if OTA == 1:
           return(OTA)
        print('OTA = ' + str(OTA))

def program_tasks():
    #do program tasks. If continuous loop, use counter or sleep to pass some time between
    #update checks. At your designated point, check for updates.
    sleep(2)
    print('Tasks completed, entering loop 2')
    sleep(2)
    print('Tasks completed, entering loop 3')
    sleep(2)
    print('Tasks completed, entering loop 4')
    sleep(2)
    print('Tasks completed, entering loop 5')
    sleep(2)
    print('5 loops completed, checking for updates')