<?php

declare(strict_types=1);

namespace ItalyStrap\Update;

/**
 * Validation class
 */
class Validation
{
    /**
     * Validate the value of key
     *
     * @todo Aggiungere rule required
     *       Prendere spunto da questo articolo
     *       https://tommcfarlin.com/validation-and-sanitization-wordpress-settings-api
     *       In particolare la classe Address_Validator
     *       Se presente il parametro required inviare
     *       un errore che notifica il campo richiesto.
     *       Esempio: 'required|alpha_dash'
     *
     * @access private
     * @param  string $rules          Insert the rule name you want to use
     *                                for validation.
     *                                Use | to separate more rules.
     * @param  string $instance_value The value you want to validate.
     * @return bool                   Return true if valid and folse if it is not
     */
    public function validate($rules, $instance_value)
    {
        $rules = explode('|', $rules);

        if (empty($rules) || count($rules) < 1) {
            return true;
        }

        foreach ($rules as $rule) {
            if (false === $this->do_validation($rule, $instance_value)) {
                return false;
            }
        }

        return true;
    }

    /**
     * Validate the value of key
     *
     * @access private
     * @param  string $rule           Insert the rule name you want to use for validation.
     * @param  string $instance_value The value you want to validate.
     * @return string                 Return the value validated
     */
    public function do_validation($rule, $instance_value = '')
    {
        switch ($rule) {
            // case 'ctype_alpha':
            //  return ctype_alpha( $instance_value );
            // break;

            // case 'ctype_alnum':
            //  return ctype_alnum( $instance_value );
            // break;

            case 'alpha_dash':
                return preg_match('/^[a-z0-9-_]+$/', $instance_value);
            break;

            // case 'ctype_digit':
            //  return ctype_digit( $instance_value );
            // break;

            // case 'integer': // is_int
            //  return (bool) preg_match( '/^[\-+]?[0-9]+$/', $instance_value );
            // break;

            // case 'boolean':
            //  return is_bool( $instance_value );
            // break;

            // case 'email':
            //  return is_email( $instance_value );
            // break;

            // case 'decimal': // is_float
            //  return (bool) preg_match( '/^[\-+]?[0-9]+\.[0-9]+$/', $instance_value );
            // break;

            // case 'natural': // is_numeric
            //  return (bool) preg_match( '/^[0-9]+$/', $instance_value );
            // return;

            case 'natural_not_zero':
                if (! preg_match('/^[0-9]+$/', $instance_value)) {
                    return false;
                }
                if (0 === $instance_value) {
                    return false;
                }
                return true;
            return;

            default:
                if (method_exists($this, $rule)) {
                    return $this->$rule($instance_value);
                } elseif (is_callable($rule)) {
                    call_user_func($rule, $instance_value);
                } else {
                    return false;
                }
                break;
        }
    }
}