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<?php

/**
 * MvcCore
 *
 * This source file is subject to the BSD 3 License
 * For the full copyright and license information, please view 
 * the LICENSE.md file that are distributed with this source code.
 *
 * @copyright   Copyright (c) 2016 Tom Flidr (https://github.com/mvccore)
 * @license     https://mvccore.github.io/docs/mvccore/5.0.0/LICENCE.md
 */

namespace MvcCore\Ext\Forms\Validators;

/**
 * Responsibility: Validate raw user input. Parse integer value if possible by 
 *                 `Intl` extension or try to determinate floating point 
 *                 automatically ant then parse to int and return `int` or `NULL`.
 */
class IntNumber extends \MvcCore\Ext\Forms\Validators\Number {

    /**
     * Error message index(es).
     * @var int
     */
    const ERROR_INT = 5;

    /**
     * Validation failure message template definitions.
     * @var array
     */
    protected static $errorMessages = [
        self::ERROR_INT => "Field `{0}` requires a valid integer (from `{1}` to `{2}` incl.).",
    ];

    /**
     * Validate raw user input. Parse integer value if possible by `Intl` extension 
     * or try to determinate floating point automatically and then parse to int and return `int` or `NULL`.
     * @param string|array  $submitValue Raw user input.
     * @return int|NULL     Safe submitted value or `NULL` if not possible to return safe value.
     */
    public function Validate ($rawSubmittedValue) {
        $rawSubmittedValue = trim((string) $rawSubmittedValue);
        if (mb_strlen($rawSubmittedValue) === 0) return NULL;
        $result = $this->parseFloat($rawSubmittedValue);
        if ($result === NULL) {
            $this->field->AddValidationError(
                static::GetErrorMessage(self::ERROR_INT)
            );
            return NULL;
        } else {
            $resultInt = intval(round($result));
            if (!$this->compareFloats($result, floatval($resultInt))) {
                $min = $this->min === NULL ? -PHP_INT_MAX : $this->min;
                $max = $this->max === NULL ? PHP_INT_MAX : $this->max;
                $this->field->AddValidationError(
                    static::GetErrorMessage(self::ERROR_INT, [$min, $max])
                );
                return NULL;
            } else {
                return $resultInt;
            }
        }
    }

    /**
     * Return `TRUE` if given floats are absolutelly equal.
     * @param float $a (required) Left operand
     * @param float $b (required) Right operand
     * @return bool
     */
    protected function compareFloats ($a, $b) {
        $aInt = intval($a);
        $bInt = intval($b);

        $aIntLen = strlen(strval($aInt));
        $bIntLen = strlen(strval($bInt));

        $aStr = strval($a);
        $bStr = strval($b);
        if ($aStr === '') $aStr = '0';
        if ($bStr === '') $bStr = '0';

        if (strpos($aStr, '.') === FALSE) $aStr .= '.0';
        if (strpos($bStr, '.') === FALSE) $bStr .= '.0';

        $aStrLen = strlen($aStr);
        $bStrLen = strlen($bStr);

        $aPreciseLen = $aStrLen - $aIntLen - 1;
        $bPreciseLen = $bStrLen - $bIntLen - 1;
        $maxPreciseLen = max($aPreciseLen, $bPreciseLen);

        return bccomp($a, $b, $maxPreciseLen) === 0;
    }
}