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<?php

enum DeclensionCase: string {
    case GEN = 'Gen';
    case DAT = 'Dat';
    case ACC = 'Acc';
    case INS = 'Ins';
    case ABL = 'Abl';
}

enum NameSex: int {
    case MALE = 0;
    case FEMALE = 1;
}

enum NameType: int {
    case FIRST_NAME = 0;
    case LAST_NAME = 1;
}

class StringsBase implements ArrayAccess {
    protected array $data = [];

    function offsetSet(mixed $offset, mixed $value): void {
        throw new RuntimeException('Not implemented');
    }

    function offsetExists(mixed $offset): bool {
        return isset($this->data[$offset]);
    }

    function offsetUnset(mixed $offset): void {
        throw new RuntimeException('Not implemented');
    }

    function offsetGet(mixed $offset): mixed {
        if (!isset($this->data[$offset])) {
            logError(__METHOD__.': '.$offset.' not found');
            return '{'.$offset.'}';
        }
        return $this->data[$offset];
    }

    function get(string $key, mixed ...$sprintf_args): string|array {
        $val = $this[$key];
        if (!empty($sprintf_args)) {
            array_unshift($sprintf_args, $val);
            return call_user_func_array('sprintf', $sprintf_args);
        } else {
            return $val;
        }
    }

    function num(string $key, int $num, array$opts = []) {
        $s = $this[$key];

        $default_opts = [
            'format' => true,
            'format_delim' => ' ',
            'lang' => 'ru',
        ];
        $opts = array_merge($default_opts, $opts);

        switch ($opts['lang']) {
            case 'ru':
                $n = $num % 100;
                if ($n > 19)
                    $n %= 10;

                if ($n == 1) {
                    $word = 0;
                } elseif ($n >= 2 && $n <= 4) {
                    $word = 1;
                } elseif ($num == 0 && count($s) == 4) {
                    $word = 3;
                } else {
                    $word = 2;
                }
                break;

            default:
                if ($num == 0 && count($s) == 4) {
                    $word = 3;
                } else {
                    $word = $num == 1 ? 0 : 1;
                }
                break;
        }

        // if zero
        if ($word == 3) {
            return $s[3];
        }

        if (is_callable($opts['format'])) {
            $num = $opts['format']($num);
        } else if ($opts['format'] === true) {
            $num = formatNumber($num, $opts['format_delim']);
        }

        return sprintf($s[$word], $num);
    }
}

class Strings extends StringsBase {
    private static ?Strings $instance = null;
    protected array $loadedPackages = [];

    private function __construct() {}
    protected function __clone() {}

    public static function getInstance(): self {
        if (is_null(self::$instance))
            self::$instance = new self();
        return self::$instance;
    }

    function load(string ...$pkgs): array {
        $keys = [];
        foreach ($pkgs as $name) {
            $raw = yaml_parse_file(APP_ROOT.'/strings/'.$name.'.yaml');
            $this->data = array_merge($this->data, $raw);
            $keys = array_merge($keys, array_keys($raw));
            $this->loadedPackages[$name] = true;
        }
        return $keys;
    }

    function flex(string $s, DeclensionCase $case, NameSex $sex, NameType $type): string {
        $s = iconv('utf-8', 'cp1251', $s);
        $s = vkflex($s, $case->value, $sex->value, 0, $type->value);
        return iconv('cp1251', 'utf-8', $s);
    }

    function search(string $regexp): array {
        return preg_grep($regexp, array_keys($this->data));
    }
}