<?php
define('MSZ_ZALGO_CHARS_UP', [
    "\u{030d}", "\u{030e}", "\u{0304}", "\u{0305}", "\u{033f}",
    "\u{0311}", "\u{0306}", "\u{0310}", "\u{0352}", "\u{0357}",
    "\u{0351}", "\u{0307}", "\u{0308}", "\u{030a}", "\u{0342}",
    "\u{0344}", "\u{034a}", "\u{034b}", "\u{034c}", "\u{0303}",
    "\u{0302}", "\u{030c}", "\u{0350}", "\u{0300}", "\u{0301}",
    "\u{030b}", "\u{030f}", "\u{0312}", "\u{0313}", "\u{0314}",
    "\u{033d}", "\u{0309}", "\u{0363}", "\u{0364}", "\u{0365}",
    "\u{0366}", "\u{0367}", "\u{0368}", "\u{0369}", "\u{036a}",
    "\u{036b}", "\u{036c}", "\u{036d}", "\u{036e}", "\u{036f}",
    "\u{033e}", "\u{035b}", "\u{0346}", "\u{031a}",
]);
define('MSZ_ZALGO_CHARS_DOWN', [
    "\u{0316}", "\u{0317}", "\u{0318}", "\u{0319}", "\u{031c}",
    "\u{031d}", "\u{031e}", "\u{031f}", "\u{0320}", "\u{0324}",
    "\u{0325}", "\u{0326}", "\u{0329}", "\u{032a}", "\u{032b}",
    "\u{032c}", "\u{032d}", "\u{032e}", "\u{032f}", "\u{0330}",
    "\u{0331}", "\u{0332}", "\u{0333}", "\u{0339}", "\u{033a}",
    "\u{033b}", "\u{033c}", "\u{0345}", "\u{0347}", "\u{0348}",
    "\u{0349}", "\u{034d}", "\u{034e}", "\u{0353}", "\u{0354}",
    "\u{0355}", "\u{0356}", "\u{0359}", "\u{035a}", "\u{0323}",
]);
define('MSZ_ZALGO_CHARS_MIDDLE', [
    "\u{0315}", "\u{031b}", "\u{0340}", "\u{0341}", "\u{0358}",
    "\u{0321}", "\u{0322}", "\u{0327}", "\u{0328}", "\u{0334}",
    "\u{0335}", "\u{0336}", "\u{034f}", "\u{035c}", "\u{035d}",
    "\u{035e}", "\u{035f}", "\u{0360}", "\u{0362}", "\u{0338}",
    "\u{0337}", "\u{0361}", "\u{0489}",
]);

define('MSZ_ZALGO_MODE_MINI', 1);
define('MSZ_ZALGO_MODE_NORMAL', 2);
define('MSZ_ZALGO_MODE_MAX', 3);

define('MSZ_ZALGO_DIR_UP', 0x01);
define('MSZ_ZALGO_DIR_MID', 0x02);
define('MSZ_ZALGO_DIR_DOWN', 0x04);

function zalgo_strip(string $text): string {
    $text = str_replace(MSZ_ZALGO_CHARS_UP, '', $text);
    $text = str_replace(MSZ_ZALGO_CHARS_DOWN, '', $text);
    $text = str_replace(MSZ_ZALGO_CHARS_MIDDLE, '', $text);

    return $text;
}

function zalgo_is_char(string $char): bool {
    return in_array($char, MSZ_ZALGO_CHARS_UP)
        || in_array($char, MSZ_ZALGO_CHARS_DOWN)
        || in_array($char, MSZ_ZALGO_CHARS_MIDDLE);
}

function zalgo_get_char(array $array): string {
    return $array[array_rand($array)];
}

function zalgo_get_string(array $array, int $length): string {
    $string = '';

    for($i = 0; $i < $length; $i++) {
        $string .= zalgo_get_char($array);
    }

    return $string;
}

function zalgo_run(
    string $text,
    int $mode = MSZ_ZALGO_MODE_MINI,
    int $direction = MSZ_ZALGO_DIR_MID | MSZ_ZALGO_DIR_DOWN
): string {
    $text_length = mb_strlen($text);

    if(!$text_length || !$mode || !$direction) {
        return $text;
    }

    $going_up   = ($direction & MSZ_ZALGO_DIR_UP) > 0;
    $going_mid  = ($direction & MSZ_ZALGO_DIR_MID) > 0;
    $going_down = ($direction & MSZ_ZALGO_DIR_DOWN) > 0;

    $str = '';

    for($i = 0; $i < $text_length; $i++) {
        $char = $text[$i];

        if(zalgo_is_char($char)) {
            continue;
        }

        $str .= $char;

        switch($mode) {
            case MSZ_ZALGO_MODE_MINI:
                $num_up     = mt_rand(0, 8);
                $num_mid    = mt_rand(0, 2);
                $num_down   = mt_rand(0, 8);
                break;

            case MSZ_ZALGO_MODE_NORMAL:
                $num_up     = mt_rand(0, 16) / 2 + 1;
                $num_mid    = mt_rand(0, 6) / 2;
                $num_down   = mt_rand(0, 8) / 2 + 1;
                break;

            case MSZ_ZALGO_MODE_MAX:
                $num_up     = mt_rand(0, 64) / 4 + 3;
                $num_mid    = mt_rand(0, 16) / 4 + 1;
                $num_down   = mt_rand(0, 64) / 4 + 3;
                break;
        }

        if($going_up) {
            $str .= zalgo_get_string(MSZ_ZALGO_CHARS_UP, $num_up);
        }

        if($going_mid) {
            $str .= zalgo_get_string(MSZ_ZALGO_CHARS_MIDDLE, $num_mid);
        }

        if($going_down) {
            $str .= zalgo_get_string(MSZ_ZALGO_CHARS_DOWN, $num_down);
        }
    }

    return $str;
}