<?php

namespace b8\Form;

use b8\Form\Element,
    b8\View;

class Input extends Element
{
    protected $_required = false;
    protected $_pattern;
    protected $_validator;
    protected $_value;
    protected $_error;
    protected $_customError = false;

    public static function create($name, $label, $required = false)
    {
        $el = new static();
        $el->setName($name);
        $el->setLabel($label);
        $el->setRequired($required);

        return $el;
    }

    public function getValue()
    {
        return $this->_value;
    }

    public function setValue($value)
    {
        $this->_value = $value;
        return $this;
    }

    public function getRequired()
    {
        return $this->_required;
    }

    public function setRequired($required)
    {
        $this->_required = (bool)$required;
        return $this;
    }

    public function getValidator()
    {
        return $this->_validator;
    }

    public function setValidator($validator)
    {
        if (is_callable($validator) || $validator instanceof \Closure) {
            $this->_validator = $validator;
        }

        return $this;
    }

    public function getPattern()
    {
        return $this->_pattern;
    }

    public function setPattern($pattern)
    {
        $this->_pattern = $pattern;
        return $this;
    }

    public function validate()
    {
        if ($this->getRequired() && empty($this->_value)) {
            $this->_error = $this->getLabel() . ' is required.';
            return false;
        }

        if ($this->getPattern() && !preg_match('/' . $this->getPattern() . '/', $this->_value)) {
            $this->_error = 'Invalid value entered.';
            return false;
        }

        $validator = $this->getValidator();

        if (is_callable($validator)) {
            try {
                call_user_func_array($validator, [$this->_value]);
            } catch (\Exception $ex) {
                $this->_error = $ex->getMessage();
                return false;
            }
        }

        if ($this->_customError) {
            return false;
        }

        return true;
    }

    public function setError($message)
    {
        $this->_customError = true;
        $this->_error = $message;
        return $this;
    }

    protected function _onPreRender(View &$view)
    {
        $view->value = $this->getValue();
        $view->error = $this->_error;
        $view->pattern = $this->_pattern;
        $view->required = $this->_required;
    }
}