<?PHP
/**
 * Contains a class for controlling the list of available units.
 *
 * @author Joshua Ramon Enslin <joshua@museum-digital.de>
 */
declare(strict_types = 1);

/**
 * Class containing available units for weights, lengths etc.
 */
final class MDUnitsSet extends MDValueSet {

    const UNITS_LENGTH = ['', 'm', 'dm', 'cm', 'mm'];
    const UNITS_WEIGHT = ['', 't', 'kg', 'g'];

    const UNITS_LENGTH_TO_MILLIMETER = [
        'm'  => 1000,
        'dm' => 100,
        'cm' => 10,
        'mm' => 1,
    ];

    const UNITS_WEIGHT_TO_GRAMM = [
        't'  => 1000000,
        'kg'  => 1000,
        'g' => 1,
    ];

    /**
     * Converts a given length to millimeters.
     *
     * @param mixed  $value Input value to convert.
     * @param string $unit  Length unit of the value to convert.
     *
     * @return float|null
     */
    public static function convertLengthToMillimeter(mixed $value, string $unit):float|null {

        if (!isset(self::UNITS_LENGTH_TO_MILLIMETER[$unit])) return null;

        try {
            $number = MD_STD_IN::sanitize_float($value);
            return floatval($number * self::UNITS_LENGTH_TO_MILLIMETER[$unit]);
        }
        catch (MDgenericInvalidInputsException $e) {
            return null;
        }

    }

    /**
     * Converts a given weight to gramm.
     *
     * @param mixed  $value Input value to convert.
     * @param string $unit  Weight unit of the value to convert.
     *
     * @return float|null
     */
    public static function convertWeightToGramm(mixed $value, string $unit):float|null {

        if (!isset(self::UNITS_WEIGHT_TO_GRAMM[$unit])) return null;

        try {
            $number = MD_STD_IN::sanitize_float($value);
            return floatval($number * self::UNITS_WEIGHT_TO_GRAMM[$unit]);
        }
        catch (MDgenericInvalidInputsException $e) {
            return null;
        }

    }

    /**
     * Returns a translated list of length units.
     *
     * @param MDTlLoader $tlLoader Translation loader.
     *
     * @return array<string>
     */
    public static function getLengthUnitsTLed(MDTlLoader $tlLoader):array {
        return parent::getTlUnsortedList($tlLoader, self::UNITS_LENGTH, "units_length_set", "units_length_set");

    }

    /**
     * Returns a translated list of weight units.
     *
     * @param MDTlLoader $tlLoader Translation loader.
     *
     * @return array<string>
     */
    public static function getWeightUnitsTLed(MDTlLoader $tlLoader):array {
        return parent::getTlUnsortedList($tlLoader, self::UNITS_WEIGHT, "units_weight_set", "units_weight_set");

    }
}