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<?php

/**
 * Class MC4WP_Field_Guesser
 *
 * @access private
 * @ignore
 */
class MC4WP_Field_Guesser
{
    /**
     * @var array
     */
    protected $fields;

/**
     * @param array $fields
     */
    public function __construct(array $fields)
    {
        $fields       = array_change_key_case($fields, CASE_UPPER);
        $this->fields = $fields;
    }

/**
     * Get all data which is namespaced with a given namespace
     *
     * @param string $namespace
     *
     * @return array
     */
    public function namespaced($namespace = 'mc4wp-')
    {
        $prefix = strtoupper($namespace);
        $return = array();
        $length = strlen($prefix);

foreach ($this->fields as $key => $value) {
            if (strpos($key, $prefix) === 0) {
                $new_key            = substr($key, $length);
                $return[ $new_key ] = $value;
            }
        }

return $return;
    }

/**
     * Guess values for the following fields
     *  - EMAIL
     *  - NAME
     *  - FNAME
     *  - LNAME
     *
     * @return array
     */
    public function guessed()
    {
        $guessed = array();

foreach ($this->fields as $field => $value) {
            // transform value into array to support 1-level arrays
            $sub_fields = is_array($value) ? $value : array( $value );

foreach ($sub_fields as $sub_field_value) {
                // poor man's urldecode, to get Enfold theme's contact element to work.
                $sub_field_value = str_replace('%40', '@', $sub_field_value);

// is this an email value? if so, assume it's the EMAIL field
                if (empty($guessed['EMAIL']) && is_string($sub_field_value) && is_email($sub_field_value)) {
                    $guessed['EMAIL'] = $sub_field_value;
                    continue 2;
                }

// remove special characters from field name
                $simple_key = str_replace(array( '-', '_', ' ' ), '', $field);

if (empty($guessed['FNAME']) && $this->string_contains($simple_key, array( 'FIRSTNAME', 'FNAME', 'GIVENNAME', 'FORENAME' ))) {
                    // find first name field
                    $guessed['FNAME'] = $sub_field_value;
                } elseif (empty($guessed['LNAME']) && $this->string_contains($simple_key, array( 'LASTNAME', 'LNAME', 'SURNAME', 'FAMILYNAME' ))) {
                    // find last name field
                    $guessed['LNAME'] = $sub_field_value;
                } elseif (empty($guessed['NAME']) && $this->string_contains($simple_key, 'NAME')) {
                    // find name field
                    $guessed['NAME'] = $sub_field_value;
                }
            }
        }

return $guessed;
    }

/**
     * @param $methods
     *
     * @return array
     */
    public function combine(array $methods)
    {
        $combined = array();

foreach ($methods as $method) {
            if (method_exists($this, $method)) {
                $combined = array_merge($combined, call_user_func(array( $this, $method )));
            }
        }

return $combined;
    }

/**
     * @param string $haystack
     * @param string|array $needles
     *
     * @return bool
     */
    private function string_contains($haystack, $needles)
    {
        if (! is_array($needles)) {
            $needles = array( $needles );
        }

foreach ($needles as $needle) {
            if (strpos($haystack, $needle) !== false) {
                return true;
            }
        }

return false;
    }
}