<?php

/**
 * EE_Normalization_Strategy_Base
 *
 * @package               Event Espresso
 * @subpackage
 * @author                Mike Nelson
 */
abstract class EE_Normalization_Strategy_Base extends EE_Form_Input_Strategy_Base
{
    /**
     * Takes the sanitized value for the input and casts it into the correct PHP type.
     * Eg, turns it into an int, float, string, boolean, datetime, etc. The validation
     * strategy should be able to depend on the normalized value being of the correct type.
     * If the normalized value passes validation, the normalized value is what other code
     * will operate on. If the sanitized value cannot be normalized, this method should either
     * add a validation error onto the input, or wrangle the input into a format that can be normalized
     * (eg, for a date input, if the user enters "2014/100/100", you can either add an error stating
     * "hey! 2014/100/100 is not a valid date!", or simply convert it into a valid date like "2014/12/31".
     * For this case, I'd prefer the former. But there may be cases where you'd just rather correct it for them)
     *
     * @param string $value_to_normalize it should always be a string. If the input receives an array, then the
     *                                   validation strategy should be called on array elements, not on the entire array
     * @return mixed the normalized value
     */
    abstract public function normalize($value_to_normalize);



    /**
     * Identical to normalize, except normalize_one() CANNOT be passed an array and
     * never returns an array. Useful if the normalization strategy converts between arrays
     *
     * @param string $individual_item_to_normalize
     * @return mixed
     */
    public function normalize_one($individual_item_to_normalize)
    {
        return $this->normalize($individual_item_to_normalize);
    }



    /**
     * Takes the normalized value (for an Yes_No_Input this could be TRUE or FALSE), and converts it into
     * the value you would use in the html form (for a Yes_No_Input this could be '1' or '0').
     *
     * @param $normalized_value
     * @return array|string the 'raw' value as used in the form, usually a string or array of strings.
     */
    abstract public function unnormalize($normalized_value);



    /**
     * Normally the same as unnormalize, except it CANNOT be passed an array and
     * ALWAYS returns a string
     *
     * @param mixed $individual_item_to_unnormalize NOT an array
     * @return string
     */
    public function unnormalize_one($individual_item_to_unnormalize)
    {
        return $this->unnormalize($individual_item_to_unnormalize);
    }
}
