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<?php

/**
 *
 * @package Duplicator
 * @copyright (c) 2021, Snapcreek LLC
 *
 */

namespace Duplicator\Libs\Snap;

use Error;
use Exception;

class SnapUtil
{
    /** @var int used in custom filter_input_custom for request (check _POST and _GET */
    const INPUT_REQUEST = 10000;

    /**
     * Return array element value or default if not set
     *
     * @param array   $array    input array
     * @param string  $key      array key
     * @param boolean $required if is required thorw Exception if isn't in array
     * @param mixed   $default  default value
     *
     * @return mixed
     */
    public static function getArrayValue($array, $key, $required = true, $default = null)
    {
        if (array_key_exists($key, $array)) {
            return $array[$key];
        } else {
            if ($required) {
                throw new \Exception("Key {$key} not present in array");
            } else {
                return $default;
            }
        }
    }

    /**
     * Gets the calling function name from where this method is called
     *
     * @param integer $backTraceBack backtrace level
     *
     * @return string Returns the calling function name from where this method is called
     */
    public static function getCallingFunctionName($backTraceBack = 0)
    {
        $callers     = debug_backtrace();
        $backTraceL1 = 1 + $backTraceBack;
        $backTraceL2 = 2 + $backTraceBack;
        $result      = '[' . str_pad(basename($callers[$backTraceL1]['file']), 25, '_', STR_PAD_RIGHT) . ':'
            . str_pad($callers[$backTraceL1]['line'], 4, ' ', STR_PAD_LEFT) . ']';
        if (isset($callers[$backTraceL2]) && (isset($callers[$backTraceL2]['class']) || isset($callers[$backTraceL2]['function']))) {
            $result .= ' [';
            $result .= isset($callers[$backTraceL2]['class']) ? $callers[$backTraceL2]['class'] . '::' : '';
            $result .= isset($callers[$backTraceL2]['function']) ? $callers[$backTraceL2]['function'] : '';
            $result .= ']';
        }

        return str_pad($result, 80, '_', STR_PAD_RIGHT);
    }

    /**
     * Return a percentage
     *
     * @param int $startingPercent  Low Percentage Limit
     * @param int $endingPercent    High Percentage Limit
     * @param int $totalTaskCount   Total count
     * @param int $currentTaskCount Current count
     *
     * @return int
     */
    public static function getWorkPercent($startingPercent, $endingPercent, $totalTaskCount, $currentTaskCount)
    {
        if ($totalTaskCount > 0) {
            $percent = $startingPercent + (($endingPercent - $startingPercent) * ($currentTaskCount / (float) $totalTaskCount));
        } else {
            $percent = $startingPercent;
        }

        return min(max($startingPercent, $percent), $endingPercent);
    }

    /**
     * Compare two versions like version_compare but the ability to enter the number of levels to compare.
     * For example, if the level is 2 between 4.1.1 and 4.1.2.1, 4.1 is compared with 4.1 and so they are equal.
     *
     * @param string $version1 version one
     * @param string $version2 version two
     * @param string $operator operetor type
     * @param int    $vLevel   version level 0 is all levels
     *
     * @return int|bool
     */
    public static function versionCompare($version1, $version2, $operator = null, $vLevel = 0)
    {
        if ($vLevel > 0) {
            $tV1      = array_slice(explode('.', $version1), 0, $vLevel);
            $version1 = implode('.', $tV1);
            $tV2      = array_slice(explode('.', $version2), 0, $vLevel);
            $version2 = implode('.', $tV2);
        }
        return version_compare($version1, $version2, $operator);
    }

    /**
     * Return true if is PHP7+
     *
     * @return bool
     */
    public static function isPHP7Plus()
    {
        static $isPHP7Plus = null;
        if (is_null($isPHP7Plus)) {
            $isPHP7Plus = version_compare(PHP_VERSION, '7.0.0', '>=');
        }
        return $isPHP7Plus;
    }

    /**
     * Groups an array into arrays by a given key, or set of keys, shared between all array members.
     *
     * Based on {@author Jake Zatecky}'s {@link https://github.com/jakezatecky/array_group_by array_group_by()} function.
     * This variant allows $key to be closures.
     *
     * @param array $array The array to have grouping performed on.
     * @param mixed $key   The key to group or split by. Can be a _string_, an _integer_, a _float_, or a _callable_.
     *                     - If the key is a callback, it must return a valid key from the array.
     *                     - If the key is _NULL_, the iterated element is skipped.
     *                     - string|int callback ( mixed $item )
     *
     * @return array|null Returns a multidimensional array or `null` if `$key` is invalid.
     */
    public static function arrayGroupBy(array $array, $key)
    {
        if (!is_string($key) && !is_int($key) && !is_float($key) && !is_callable($key)) {
            trigger_error('array_group_by(): The key should be a string, an integer, or a callback', E_USER_ERROR);
            return null;
        }
        $func = (!is_string($key) && is_callable($key) ? $key : null);
        $_key = $key;
        // Load the new array, splitting by the target key
        $grouped = array();
        foreach ($array as $value) {
            $key = null;
            if (is_callable($func)) {
                $key = call_user_func($func, $value);
            } elseif (is_object($value) && isset($value->{$_key})) {
                $key = $value->{$_key};
            } elseif (isset($value[$_key])) {
                $key = $value[$_key];
            }
            if ($key === null) {
                continue;
            }
            $grouped[$key][] = $value;
        }
        // Recursively build a nested grouping if more parameters are supplied
        // Each grouped array value is grouped according to the next sequential key
        if (func_num_args() > 2) {
            $args = func_get_args();
            foreach ($grouped as $key => $value) {
                $params        = array_merge(array($value), array_slice($args, 2, func_num_args()));
                $grouped[$key] = call_user_func_array(array(__CLASS__, 'arrayGroupBy'), $params);
            }
        }
        return $grouped;
    }

    /**
     * Converts human readable types (10GB) to bytes
     *
     * @param string $from A human readable byte size such as 100MB
     *
     * @return int Returns and integer of the byte size
     */
    public static function convertToBytes($from)
    {
        if (is_numeric($from)) {
            return $from;
        }

        $number = substr($from, 0, -2);
        switch (strtoupper(substr($from, -2))) {
            case "KB":
                return $number * 1024;
            case "MB":
                return $number * pow(1024, 2);
            case "GB":
                return $number * pow(1024, 3);
            case "TB":
                return $number * pow(1024, 4);
            case "PB":
                return $number * pow(1024, 5);
        }

        $number = substr($from, 0, -1);
        switch (strtoupper(substr($from, -1))) {
            case "K":
                return $number * 1024;
            case "M":
                return $number * pow(1024, 2);
            case "G":
                return $number * pow(1024, 3);
            case "T":
                return $number * pow(1024, 4);
            case "P":
                return $number * pow(1024, 5);
        }
        return $from;
    }

    /**
     *  Sanitize input for XSS code
     *
     *  @param string $input The value to sanitize
     *
     *  @return string Returns the input value cleaned up.
     */
    public static function sanitize($input)
    {
        return htmlspecialchars(self::sanitizeNSChars($input));
    }

    /**
     * Remove all non stamp chars from string
     *
     * @param string $string input string
     *
     * @return string
     */
    public static function sanitizeNSChars($string)
    {
        return preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x9F]/u', '', (string) $string);
    }

    /**
     * remove all non stamp chars from string and newline
     * trim string
     *
     * @param string $string input string
     *
     * @return string
     */
    public static function sanitizeNSCharsNewline($string)
    {
        return preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x9F\r\n]/u', '', (string) $string);
    }

    /**
     * Remove all non stamp chars, newline, spaces and tabulation from string
     *
     * @param string $string input string
     *
     * @return string
     */
    public static function sanitizeNSCharsNewlineTabs($string)
    {
        return preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x9F\r\n\s]/u', '', (string) $string);
    }

    /**
     * remove all non stamp chars from string and newline
     * trim string
     *
     * @param string $string input string
     *
     * @return string
     */
    public static function sanitizeNSCharsNewlineTrim($string)
    {
        return trim(self::sanitizeNSCharsNewline($string));
    }

    /**
     * Determines whether a PHP ini value is changeable at runtime.
     *
     * @since 4.6.0
     *
     * @staticvar array $ini_all
     *
     * @link https://secure.php.net/manual/en/function.ini-get-all.php
     *
     * @param string $setting The name of the ini setting to check.
     * @return bool True if the value is changeable at runtime. False otherwise.
     */
    public static function isIniValChangeable($setting)
    {
        // if ini_set is disabled can change the values
        if (!function_exists('ini_set')) {
            return false;
        }

        if (function_exists('isIniValChangeable')) {
            return isIniValChangeable($setting);
        }

        static $ini_all;

        if (!isset($ini_all)) {
            $ini_all = false;
            // Sometimes `ini_get_all()` is disabled via the `disable_functions` option for "security purposes".
            if (function_exists('ini_get_all')) {
                $ini_all = ini_get_all();
            }
        }

        // Bit operator to workaround https://bugs.php.net/bug.php?id=44936 which changes access level to 63 in PHP 5.2.6 - 5.2.17.
        if (isset($ini_all[$setting]['access']) && ( INI_ALL === ( $ini_all[$setting]['access'] & 7 ) || INI_USER === ( $ini_all[$setting]['access'] & 7 ) )) {
            return true;
        }

        // If we were unable to retrieve the details, fail gracefully to assume it's changeable.
        if (!is_array($ini_all)) {
            return true;
        }

        return false;
    }

    /**
     * The val value returns if it is between min and max otherwise it returns min or max
     *
     * @param int $val input value
     * @param int $min min value
     * @param int $max max value
     *
     * @return int
     */
    public static function getIntBetween($val, $min, $max)
    {
        return min((int) $max, max((int) $min, (int) $val));
    }

    /**
     * Gets a specific external variable by name and optionally filters it by request
     *
     * @param string    $variable_name <p>Name of a variable to get.</p>
     * @param int       $filter        <p>The ID of the filter to apply. The Types of filters manual page lists the available filters.</p>
     *                                 <p>If omitted, <b><code>FILTER_DEFAULT</code></b> will be used,
     *                                 which is equivalent to <b><code>FILTER_UNSAFE_RAW</code></b>.
     *                                 This will result in no filtering taking place by default.</p>
     * @param array|int $options       <p>Associative array of options or bitwise disjunction of flags.
     *                                 If filter accepts options, flags can be provided in "flags" field of array.</p>
     *
     * @return mixed <p>Value of the requested variable on success, <b><code>FALSE</code></b>
     *               if the filter fails, or <b><code>NULL</code></b>
     *               if the <code>variable_name</code> variable is not set.
     *               If the flag <b><code>FILTER_NULL_ON_FAILURE</code></b> is used,
     *               it returns <b><code>FALSE</code></b> if the variable is not set and <b><code>NULL</code></b> if the filter fails.</p>
     *
     * @link http://php.net/manual/en/function.filter-input.php
     * @see filter_var(), filter_input_array(), filter_var_array()
     */
    public static function filterInputRequest($variable_name, $filter = FILTER_DEFAULT, $options = 0)
    {
        if (isset($_GET[$variable_name]) && !isset($_POST[$variable_name])) {
            return filter_input(INPUT_GET, $variable_name, $filter, $options);
        }

        return filter_input(INPUT_POST, $variable_name, $filter, $options);
    }

    /**
     * Default filter sanitize string, apply sanitizeNSChars function.
     *
     * @param int    $type     One of INPUT_GET, INPUT_POST, INPUT_COOKIE, INPUT_SERVER, or INPUT_ENV.
     * @param string $var_name Name of a variable to get.
     * @param mixed  $default  default value if dont exists
     *
     * @return string
     */
    public static function filterInputDefaultSanitizeString($type, $var_name, $default = '')
    {
        $filter  =  FILTER_UNSAFE_RAW;
        $options = array(
            'options' => array( 'default' => null)
        );
        if ($type == self::INPUT_REQUEST) {
            $result = self::filterInputRequest($var_name, $filter, $options);
        } else {
            $result = filter_input($type, $var_name, $filter, $options);
        }
        if (is_null($result)) {
            return $default;
        }
        return self::sanitizeNSChars($result);
    }

    /**
     * All characters that are not explicitly accepted are removed.
     * By default, only alphanumeric characters are accepted.
     *
     * @param mixed  $input            input value
     * @param string $extraAcceptChars extra accepted chars
     *
     * @return string|string[]
     */
    public static function sanitizeStrict($input, $extraAcceptChars = '')
    {
        $regex = '/[^a-zA-Z0-9 ' . preg_quote($extraAcceptChars, '/') . ' ]/m';
        if (is_scalar($input) || is_null($input)) {
            $input = (string) $input;
        } elseif (is_array($input)) {
        } elseif (is_object($input)) {
            $input = (array) $input;
        } else {
            $input = '';
        }

        if (is_array($input)) {
            foreach ($input as $key => $val) {
                $input[$key] = self::sanitizeStrict($val, $extraAcceptChars);
            }
            return $input;
        }

        $result = preg_replace($regex, '', $input);
        return (is_null($result) ? '' : $result);
    }

    /**
     * Sanitize value from input $_GET, $_POST, $_REQUEST ...
     *
     * @param int    $type             One of INPUT_GET, INPUT_POST, INPUT_COOKIE, INPUT_SERVER, INPUT_ENV or Sanitize::INPUT_REQUEST
     * @param string $varName          Name of a variable to get.
     * @param mixed  $default          default value if var $varName don't exists
     * @param string $extraAcceptChars extra accepted chars
     *
     * @return string|string[]|mixed return default value if varName isn't defined
     */
    public static function sanitizeStrictInput($type, $varName, $default = false, $extraAcceptChars = '')
    {
        if (($value = self::getValueByType($type, $varName)) === null) {
            return $default;
        }

        return self::sanitizeStrict($value, $extraAcceptChars);
    }


    /**
     * Return value input by type null if don't exists
     *
     * @param int    $type    One of INPUT_GET, INPUT_POST, INPUT_COOKIE, INPUT_SERVER, INPUT_ENV or Sanitize::INPUT_REQUEST
     * @param string $varName Name of a variable to get.
     *
     * @return string|string[]|null
     */
    protected static function getValueByType($type, $varName)
    {
        $doNothingCallback = function ($v) {
            return $v;
        };

        if ($type === self::INPUT_REQUEST) {
            $type = ((isset($_GET[$varName]) && !isset($_POST[$varName])) ? INPUT_GET : INPUT_POST);
        }
        $value = filter_input($type, $varName, FILTER_CALLBACK, array('options' => $doNothingCallback));

        /** @var string|string[]|null $value */
        return $value;
    }

    /**
     * Gets external variables and optionally filters them
     * <p>This function is useful for retrieving many values without repetitively calling <code>filter_input()</code>.</p>
     *
     * @param array|int $definition <p>An array defining the arguments.
     *                              A valid key is a <code>string</code> containing a variable name and a valid value is either a filter type,
     *                              or an <code>array</code> optionally specifying the filter, flags and options.
     *                              If the value is an array, valid keys are <i>filter</i> which specifies the filter type,
     *                              <i>flags</i> which specifies any flags that apply to the filter, and <i>options</i>
     *                              which specifies any options that apply to the filter. See the example below for a better understanding.</p>
     *                              <p>This parameter can be also an integer holding a filter constant.
     *                              Then all values in the input array are filtered by this filter.</p>
     * @param bool      $add_empty  <p>Add missing keys as <b><code>NULL</code></b> to the return value.</p>
     *
     * @return mixed <p>An array containing the values of the requested variables on success.
     *               If the input array designated by <code>type</code> is not populated,
     *               the function returns <b><code>NULL</code></b> if the <b><code>FILTER_NULL_ON_FAILURE</code></b> flag is not given,
     *               or <b><code>FALSE</code></b> otherwise. For other failures, <b><code>FALSE</code></b> is returned.</p>
     *               <p>An array value will be <b><code>FALSE</code></b> if the filter fails, or <b><code>NULL</code></b>
     *               if the variable is not set. Or if the flag <b><code>FILTER_NULL_ON_FAILURE</code></b> is used,
     *               it returns <b><code>FALSE</code></b> if the variable is not set and <b><code>NULL</code></b> if the filter fails.
     *               If the <code>add_empty</code> parameter is <b><code>FALSE</code></b>, no array element will be added for unset variables.</p>
     *
     * @link http://php.net/manual/en/function.filter-input-array.php
     * @see filter_input(), filter_var_array()
     */
    public static function filterInputRequestArray($definition = FILTER_DEFAULT, $add_empty = true)
    {
        if (!is_array($definition) || count($definition) === 0) {
            return array();
        }
        $getKeys  = is_array($_GET) ? array_keys($_GET) : array();
        $postKeys = is_array($_POST) ? array_keys($_POST) : array();
        $keys     = array_keys($definition);

        if (count(array_intersect($keys, $getKeys)) && !count(array_intersect($keys, $postKeys))) {
            $type = INPUT_GET;
        } else {
            $type = INPUT_POST;
        }

        $result = filter_input_array($type, $definition, $add_empty);

        if (!is_array($result)) {
            $result = array();
            foreach ($keys as $key) {
                $result[$key] = null;
            }
        }
        return $result;
    }

    /**
     * Close all buffers and return content
     *
     * @param bool $getContent If true it returns buffer content, otherwise it is discarded
     *
     * @return string
     */
    public static function obCleanAll($getContent = true)
    {
        static $minLevel = null;
        if ($minLevel === null) {
            $isZipCompression = filter_var(@ini_get('zlib.output_compression'), FILTER_VALIDATE_BOOLEAN);
            $minLevel         = ($isZipCompression ? 1 : 0);
        }
        $result = '';
        $levels = ob_list_handlers();
        for ($i = (count($levels) - 1); $i > $minLevel; $i--) {
            if (strcmp($levels[$i], 'ob_gzhandler') === 0) {
                break;
            }
            if ($getContent) {
                $result .= ob_get_clean();
            }
            ob_clean();
        }
        return $result;
    }

    /**
     * Array map recursively
     *
     * @param callable $callback
     * @param array $array
     *
     * @return array
     */
    public static function arrayMapRecursive($callback, $array)
    {
        if (!is_array($array)) {
            throw new Exception('$array must be an array');
        }
        if (!is_callable($callback)) {
            throw new Exception('$callback must be callable');
        }
        $func = function ($item) use (&$func, &$callback) {
            return is_array($item) ? array_map($func, $item) : call_user_func($callback, $item);
        };
        return array_map($func, $array);
    }

    /**
     * Implemented array_key_first
     *
     * @link https://www.php.net/manual/en/function.array-key-first.php
     *
     * @param array $arr array input
     *
     * @return int|string|null
     */
    public static function arrayKeyFirst($arr)
    {
        if (!function_exists('array_key_first')) {
            foreach ($arr as $key => $unused) {
                return $key;
            }
            return null;
        } else {
            return array_key_first($arr);
        }
    }

    /**
     * Get number of bit supported by PHP
     *
     * @return string
     */
    public static function getArchitectureString()
    {
        return (PHP_INT_SIZE * 8) . '-bit';
    }

    /**
     * In array check by callback
     *
     * @param array    $haystack array input
     * @param callable $callback callback function
     *
     * @return null|bool
     */
    public static function inArrayExtended($haystack, $callback)
    {
        if (!is_callable($callback)) {
            return null;
        }

        foreach ($haystack as $value) {
            if (call_user_func($callback, $value)) {
                return true;
            }
        }

        return false;
    }

    /**
     * This is a binary recursion, so it only works on an ordered array of integers.
     * (If it is not ordered, it does not work)
     *
     * The advantage of using this search instead of normal array search is that the complexity goes from O(n) to O(log n).
     *
     * @param int[] $array array values
     * @param int   $x     element to search
     *
     * @return bool
     */
    public static function binarySearch($array, $x)
    {
        if (count($array) === 0) {
            return false;
        }
        $low  = 0;
        $high = count($array) - 1;

        while ($low <= $high) {
            $mid = floor(($low + $high) / 2);

            if ($array[$mid] == $x) {
                return true;
            }
            if ($x < $array[$mid]) {
                $high = $mid - 1;
            } else {
                $low = $mid + 1;
            }
        }
        return false;
    }

    /**
     * Generates a random password drawn from the defined set of characters.
     * Copy of the wp_generate_password() function from wp-includes/pluggable.php with minor tweaks
     *
     * @param int  $length              Optional. The length of password to generate. Default 12.
     * @param bool $special_chars       Optional. Whether to include standard special characters.
     *                                  Default true.
     * @param bool $extra_special_chars Optional. Whether to include other special characters.
     *                                  Used when generating secret keys and salts. Default false.
     *
     * @return string The random password.
     */
    public static function generatePassword($length = 12, $special_chars = true, $extra_special_chars = false)
    {
        $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
        if ($special_chars) {
            $chars .= '!@#$%^&*()';
        }
        if ($extra_special_chars) {
            $chars .= '-_ []{}<>~`+=,.;:/?|';
        }

        $password = '';
        for ($i = 0; $i < $length; $i++) {
            $password .= substr($chars, self::rand(0, strlen($chars) - 1), 1);
        }

        return $password;
    }

    /**
     * Generates a random number
     * Copy of the wp_rand() function from wp-includes/pluggable.php with minor tweaks
     *
     * @global string $rnd_value
     * @staticvar string $seed
     * @staticvar bool $external_rand_source_available
     *
     * @param int $min Lower limit for the generated number
     * @param int $max Upper limit for the generated number
     * @return int A random number between min and max
     */
    public static function rand($min = 0, $max = 0)
    {
        global $rnd_value;
        // Some misconfigured 32bit environments (Entropy PHP, for example) truncate integers
        // larger than PHP_INT_MAX to PHP_INT_MAX rather than overflowing them to floats.
        $max_random_number = 3000000000 === 2147483647 ? (float) "4294967295" : 4294967295;
        // 4294967295 = 0xffffffff
        // We only handle Ints, floats are truncated to their integer value.
        $min = (int) $min;
        $max = (int) $max;
        // Use PHP's CSPRNG, or a compatible method
        static $use_random_int_functionality = null;
        if (is_null($use_random_int_functionality)) {
            $use_random_int_functionality = function_exists('random_int');
        }
        if ($use_random_int_functionality) {
            try {
                $_max = ( 0 != $max ) ? $max : $max_random_number;
                // rand() can accept arguments in either order, PHP cannot.
                $_max = max($min, $_max);
                $_min = min($min, $_max);
                $val  = random_int($_min, $_max);
                if (false !== $val) {
                    return abs(intval($val));
                } else {
                    $use_random_int_functionality = false;
                }
            } catch (Error $e) {
                $use_random_int_functionality = false;
            } catch (Exception $e) {
                $use_random_int_functionality = false;
            }
        }

        // Reset $rnd_value after 14 uses
        // 32(md5) + 40(sha1) + 40(sha1) / 8 = 14 random numbers from $rnd_value
        if (strlen($rnd_value) < 8) {
            static $seed = '';
            $rnd_value   = md5(uniqid(microtime() . mt_rand(), true) . $seed);
            $rnd_value  .= sha1($rnd_value);
            $rnd_value  .= sha1($rnd_value . $seed);
            $seed        = md5($seed . $rnd_value);
        }

        // Take the first 8 digits for our value
        $value = substr($rnd_value, 0, 8);
        // Strip the first eight, leaving the remainder for the next call to rand().
        $rnd_value = substr($rnd_value, 8);
        $value     = abs(hexdec($value));
        // Reduce the value to be within the min - max range
        if ($max != 0) {
            $value = $min + ( $max - $min + 1 ) * $value / ( $max_random_number + 1 );
        }

        return abs(intval($value));
    }

    /**
     * Function phpinfo wrapper
     * @see https://www.php.net/manual/en/function.phpinfo.php
     *
     * @param int $flags see phpinfo function flags
     *
     * @return bool Returns true on success or false on failure.
     */
    public static function phpinfo($flags = INFO_ALL)
    {
        if (!function_exists('phpinfo')) {
            return false;
        }
        return phpinfo($flags);
    }


}