<?php

require_once "contact.php";
const DATA_FILE = "data.txt";

function addContact($contactToAdd) {
    $contacts = getContacts();

    $exist = false;
    foreach ($contacts as $contact) {
        if($contact->phone === $contactToAdd->phone) {
            $exist = true;
            break;
        }
    }
    if (!$exist) {
        $serializedContact = base64_encode($contactToAdd->firstName) .  ";"
            . base64_encode($contactToAdd->lastName) .
            ";" . base64_encode($contactToAdd->phone) . PHP_EOL;
        file_put_contents(DATA_FILE, $serializedContact, FILE_APPEND);

    }
}
function getContacts(){
    $lines = file(DATA_FILE);
    $contacts = [];
    foreach ($lines as $line) {
        list($firstName, $lastName, $phone) = explode(";", $line);
        $contact = new contact(base64_decode($firstName),
            base64_decode($lastName), base64_decode($phone));
        $contacts[] = $contact;
    }
    return $contacts;
}