<?PHP
/**
 * Contains class NodaUncertaintyHelper.
 *
 * @author Joshua Ramon Enslin <joshua@museum-digital.de>
 */
declare(strict_types = 1);

/**
 * Contains static functions for getting IDs for noda entries by various means.
 */
final class NodaUncertaintyHelper {

    const PERSINST_INDICATORS_DISALLOWED = [
        "Unbekannt",
        "unbekannt",
        "n.n.",
        "N.N.",
        "Künstler, unbekannt",
        "ismeretlen",
        "Ismeretlen",
        "ismeretlen.",
        "Ismeretlen.",
    ];

    const PERSINST_UNCERTAINTY_PREFIXES = [
        "wohl ",
        "wahrscheinlich ",
        "Wohl ",
        "Wahrscheinlich ",
    ];

    const PERSINST_UNCERTAINTY_SUFFIXES = [
        "(?)",
        "?",
    ];

    const TIME_INDICATORS_DISALLOWED = [
        "o.D.",
        "O.D.",
        "o.J.",
        "O.J.",
        "Ohne Datum",
        "ohne Datum",
        "Unbekannt",
        "unbekannt",
        "ismeretlen",
        "Ismeretlen",
    ];

    const TIME_UNCERTAINTY_PREFIXES = [
        "um ",
        "wohl um ",
        "circa ",
        "ca. ",
        "ca "
    ];

    const TIME_UNCERTAINTY_SUFFIXES = [
        "(?)",
        "?",
        " körül"
    ];

    /**
     * Substrings used to express uncertainty about the validity of a place name.
     */
    const PLACE_INDICATORS_DISALLOWED = [
        "Unbekannt",
        "unbekannt",
        "keine Angaben",
        "Keine Angaben",
        "ohne Angabe",
        "Ohne Angabe",
        "ismeretlen",
        "Ismeretlen",
    ];

    const PLACE_UNCERTAINTY_PREFIXES = [
        "vlt. ",
        "circa ",
        "ca. ",
        "ca ",
    ];

    const PLACE_UNCERTAINTY_SUFFIXES = [
        "(?)",
        "?",
    ];

    /**
     * Trims common characters and charater marks.
     *
     * @param string $input Input text.
     *
     * @return string
     */
    public static function trim(string $input):string {

        $input = \trim($input, ", \t\n\r\n;-:");
        return $input;

    }

    /**
     * Removes uncertainty indicators from an time name.
     *
     * @param string $name Input string.
     *
     * @return string
     */
    public static function cleanUncertaintyIndicatorsTime(string $name):string {

        $name = self::trim($name);

        if (\in_array($name, self::TIME_INDICATORS_DISALLOWED, true)) {
            return "";
        }

        // Remove uncertainty prefixes
        foreach (NodaUncertaintyHelper::TIME_UNCERTAINTY_PREFIXES as $prefix) {
            if (\substr($name, 0, \strlen($prefix)) === "$prefix") {
                $name = substr($name, \strlen($prefix));
            }
        }

        // Remove uncertainty sufixes
        foreach (NodaUncertaintyHelper::TIME_UNCERTAINTY_SUFFIXES as $suffix) {
            if (\substr($name, \strlen($suffix) * -1) === "$suffix") {
                $name = \substr($name, 0, \strlen($suffix) * -1);
            }
        }

        return self::trim($name);

    }

    /**
     * Attempts guessing whether time is uncertain.
     *
     * @param string $zeit_name Time name.
     *
     * @return boolean
     */
    public static function guessTimeCertainty(string $zeit_name):bool {

        $zeit_name = \strtolower($zeit_name);

        // Attempt to guess uncertainty based on prefixes.
        foreach (self::TIME_UNCERTAINTY_PREFIXES as $prefix) {
            if (\substr($zeit_name, 0, \strlen($prefix)) === $prefix) {
                return false; // Uncertainty found
            }
        }

        // Attempt to guess uncertainty based on prefixes.
        foreach (self::TIME_UNCERTAINTY_SUFFIXES as $prefix) {
            if (\substr($zeit_name, -1 * \strlen($prefix)) === $prefix) {
                return false; // Uncertainty found
            }
        }

        return true; // No uncertainty found

    }

    /**
     * Removes uncertainty indicators from an place name.
     *
     * @param string $ort_name Input string.
     *
     * @return string
     */
    public static function cleanUncertaintyIndicatorsPlace(string $ort_name):string {

        $ort_name = self::trim($ort_name);

        if (\in_array($ort_name, self::PLACE_INDICATORS_DISALLOWED, true)) {
            return "";
        }

        // Remove uncertainty prefixes
        foreach (NodaUncertaintyHelper::PLACE_UNCERTAINTY_PREFIXES as $prefix) {
            if (\substr($ort_name, 0, \strlen($prefix)) === "$prefix") {
                $ort_name = substr($ort_name, \strlen($prefix));
            }
        }

        // Remove uncertainty sufixes
        foreach (NodaUncertaintyHelper::PLACE_UNCERTAINTY_SUFFIXES as $suffix) {
            if (\substr($ort_name, \strlen($suffix) * -1) === "$suffix") {
                $ort_name = \substr($ort_name, 0, \strlen($suffix) * -1);
            }
        }

        return self::trim($ort_name);

    }

    /**
     * Attempts guessing whether place is uncertain.
     *
     * @param string $ort_name Place name.
     *
     * @return boolean
     */
    public static function guessPlaceCertainty(string $ort_name):bool {

        $ort_name = \strtolower($ort_name);

        // Attempt to guess uncertainty based on prefixes.
        foreach (NodaUncertaintyHelper::PLACE_UNCERTAINTY_PREFIXES as $prefix) {
            if (\substr($ort_name, 0, \strlen($prefix)) === $prefix) {
                return false; // Uncertain
            }
        }

        // Attempt to guess uncertainty based on prefixes.
        foreach (NodaUncertaintyHelper::PLACE_UNCERTAINTY_SUFFIXES as $prefix) {
            if (\substr($ort_name, -1 * \strlen($prefix)) === $prefix) {
                return false; // Uncertain
            }
        }

        return true; // Certain / no uncertainty found

    }

    /**
     * Removes uncertainty indicators from an actor name.
     *
     * @param string $value Input string.
     *
     * @return string
     */
    public static function cleanUncertaintyIndicatorsPersinst(string $value):string {

        $value = self::trim($value);

        if (\in_array($value, self::PERSINST_INDICATORS_DISALLOWED, true)) {
            return "";
        }

        foreach (self::PERSINST_UNCERTAINTY_PREFIXES as $toRemove) {
            if (\mb_substr($value, 0, \mb_strlen($toRemove)) === $toRemove) {
                $value = substr($value, \mb_strlen($toRemove));
            }
        }

        foreach (self::PLACE_UNCERTAINTY_SUFFIXES as $suffix) {
            if (\mb_substr($value, \mb_strlen($suffix) * -1) === "$suffix") {
                $value = \mb_substr($value, 0, \mb_strlen($suffix) * -1);
            }
        }

        return self::trim($value);

    }

    /**
     * Attempts guessing whether persinst is uncertain.
     *
     * @param string $name Persinst name.
     *
     * @return boolean
     */
    public static function guessPersinstCertainty(string $name):bool {

        $name = \trim(\strtolower($name));

        // Attempt to guess uncertainty based on prefixes.
        foreach (NodaUncertaintyHelper::PERSINST_UNCERTAINTY_PREFIXES as $prefix) {
            if (\substr($name, 0, \strlen($prefix)) === $prefix) {
                return false; // Uncertain
            }
        }

        // Attempt to guess uncertainty based on prefixes.
        foreach (NodaUncertaintyHelper::PERSINST_UNCERTAINTY_SUFFIXES as $prefix) {
            if (\substr($name, -1 * \strlen($prefix)) === $prefix) {
                return false; // Uncertain
            }
        }

        return true; // Certain / no uncertainty found

    }
}