main.ab

// IPv4 Logger
import {file_exist,file_write,file_read,file_append} from "std/fs"
import {exit} from "std/env"
import {lines,len,parse,split,trim} from "std/text" 
import {date_posix,now} from "std/date" 

let file_name = "ipv4.txt"

let ipv4_endpoint = "https://api.ipify.org"

fun fetch_ipv4(){
    return unsafe $curl {ipv4_endpoint}$
}

fun log_exist(){
    let is_log_exist = file_exist(file_name)
    return is_log_exist
}

fun check_same_previous_ip(current_ip){
    let logfile_content = unsafe lines(file_read(file_name))
    let last_line_from_log = len(logfile_content)-1 
    let previous_ip = split(logfile_content[last_line_from_log],":")
    let previous_ip_text = previous_ip[0]
    return trim(current_ip) == trim(previous_ip_text)  
}

fun log_content(current_ip){
    let log_context = current_ip + " : " + unsafe $date$
    return log_context as Text
}

fun main(){
    let current_ip = fetch_ipv4()
    if not(current_ip is Text) : exit(1)
    let log_content = log_content(current_ip)
    if not log_exist() {
        echo "Log file does not exist. Create and logging"
        unsafe file_write(file_name,log_content)
    }
    else {
        echo "Logging IPv4"
        if not check_same_previous_ip(current_ip) : echo "IP Changed !"
        unsafe file_append(file_name,log_content)
    }
}

unsafe main()