<?php

class Qs_Validate_NotEmptyDependent extends \Zend_Validate_Abstract
{
    const MISSING_FIELD_NAME = 'missingField';
    const IS_EMPTY           = 'isEmpty';

    protected $_dependentFieldName;
    protected $_messageTemplates = [
        self::MISSING_FIELD_NAME => 'No dependent field set',
        self::IS_EMPTY           => 'This is a required field',
    ];

    public function __construct($dependentFieldName = null)
    {
        if (null !== $dependentFieldName) {
            $this->setDependentFieldName($dependentFieldName);
        }
    }

    public function setDependentFieldName($fieldName)
    {
        $this->_dependentFieldName = (string) $fieldName;
        return $this;
    }

    public function getDependentFieldName()
    {
        return $this->_dependentFieldName;
    }

    public function isValid($value, $context = null)
    {
        $value = (string) $value;
        $this->_setValue($value);
        $dependentFieldName = $this->getDependentFieldName();

        if (empty($dependentFieldName)) {
            $this->_error(self::MISSING_FIELD_NAME);
            return false;
        }

        $dependentFieldValue = '';
        if (is_array(($context))) {
            $dependentFieldValue = $context[$dependentFieldName];
        } else if (is_string($context)) {
            $dependentFieldValue = $context;
        }

        if (empty($dependentFieldValue)) {
            return true;
        }

        if (empty($value)) {
            $this->_error(self::IS_EMPTY);
            return false;
        }

        return true;
    }
}