TASK 2 - WP Endpoint

task-2-wp-endpoint.php

<?php

namespace WP_Endpoint;

class Notifier
{
    protected $valid        = true;
    protected $messages     = [];

    public $email      = '';
    public $company_id = '';

    /**
     * Construction
     */
    public function __construct()
    {
        add_action('wp_ajax_add-notifier-email' ,[$this,'prepare']);

    }

    /**
     * Validating input data
     * @return void
     */
    public function validation()
    {
        if(!filter_var($this->email,FILTER_VALIDATE_EMAIL)) :
            $this->valid        = false;
            $this->messages[]   = __('Email address is not valid','Endpoint');
        endif;

        if(empty($this->company_id)) :
            $this->valid        = false;
            $this->messages[]   = __('Company ID is empty or incorrect value','Endpoint');
        endif;
    }

    /**
     * Add new data with extra carefull
     * @return void
     */
    public function prepare()
    {
        if(isset($_POST['email']) && isset($_POST['company_id']) && current_user_can('manage_options')) :

            $this->email        = $_POST['email'];
            $this->company_id   = (int) $_POST['company_id'];

            $this->validation();

            if($this->valid) :
                $this->update();
                $this->messages[] = __('Field updated','Endpoint');
            endif;
        else :

            $this->valid    = false;
            $this->messages[]   = __('Sorry, you didn\'t send with correct parameters','Endpoint');

        endif;

        wp_send_json([
            'valid'    => $this->valid,
            'messages' => $this->messages
        ]);
    }

    /**
     * Insert new email
     * @return void
     */
    public function update()
    {
        $emails            = get_field('email_notifiers',$this->company_id);
        $emails[]['email'] = $this->email;

        update_field('email_notifiers',$emails,$this->company_id);
    }
}

new Notifier;