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<?php
/*
 * File: ratatoeskr/sys/utils.php
 *
 * Various useful helper functions.
 *
 * License:
 * This file is part of Ratatöskr.
 * Ratatöskr is licensed unter the MIT / X11 License.
 * See "ratatoeskr/licenses/ratatoeskr" for more information.
 */

/*
 * Function: array_repeat
 *
 * Parameters:
 *
 *  $val -
 *  $n   -
 *
 * Returns:
 *
 *  An array with $val $n-times repeated.
 */
function array_repeat($val, $n)
{
    $rv = array();
    for($i = 0; $i < $n; ++$i)
        array_push($rv, $val);
    return $rv;
}

/*
 * Function: array_blend
 *
 * Blend multiple arrays together.
 *
 * Example:
 *
 *  array_blend(array(1,2,3), array(4,5,6), array(7,8,9));
 *  will return array(1,4,7,2,5,8,3,6,9)
 */
function array_blend()
{
    $arrays = array_filter(func_get_args(), "is_array");

    switch(count($arrays))
    {
        case 0:  return array(); break;
        case 1:  return $arrays[0]; break;
        default:
            $rv = array();
            while(array_sum(array_map("count", $arrays)) > 0)
            {
                for($i = 0; $i < count($arrays); ++$i)
                {
                    $val = array_shift($arrays[$i]);
                    if($val === NULL)
                        continue;
                    array_push($rv, $val);
                }
            }
            return $rv;
            break;
    }
}

/*
 * Function: array_filter_empty
 *
 * Filters all empty elements out of an array.
 *
 * Parameters:
 *
 *  $input - The input array
 *
 * Returns:
 *
 *  The $input without its empty elements.
 */
function array_filter_empty($input)
{
    return array_filter($input, function($x){return !empty($x);});
}

/*
 * Function: array_filter_keys
 *
 * Like PHPs `array_filter`, but callback will get the key, not the value of the array element.
 */
function array_filter_keys($input, $callback)
{
    if(!is_array($input))
        throw new InvalidArgumentException("Argument 1 must be an array");
    if(empty($input))
        return array();
    $delete_keys = array_filter(array_keys($input), function ($x) use ($callback) { return !$callback($x);});
    foreach($delete_keys as $key)
        unset($input[$key]);
    return $input;
}

/*
 * Function: array_kvpairs_to_assoc
 * Convert array of key-value pairs to an associative array.
 *
 * Parameters:
 *  $input - Array of key-value pairs
 *
 * Returns:
 *  An associative array.
 */
function array_kvpairs_to_assoc($input)
{
    $rv = array();
    foreach($input as $kvpair)
        $rv[$kvpair[0]] = $kvpair[1];
    return $rv;
}

/*
 * Function: intcmp
 * Compare integers (equavilent to strcmp)
 */
function intcmp($a, $b)
{
    return ($a == $b) ? 0 : (($a < $b) ? -1 : 1);
}

/*
 * Function: ucount
 *
 * Count elements of an array matching unser-defined rules.
 *
 * Parameters:
 *  $array    - The input array.
 *  $callback - A callback function. It will be called with the current value as the only parameter. The value is counted, if callback returns TRUE.
 *
 * Returns:
 *
 *  Number of elements where $callback returned TRUE.
 */
function ucount($array, $callback)
{
    return count(array_filter($array, $callback));
}

/*
 * Function: vcount
 *
 * Counts how often $value appears in $array.
 *
 * Parameters:
 *
 *  $array -
 *  $value -
 *
 * Returns:
 *
 *  How often $value appears in $array.
 */
function vcount($array, $value)
{
    return ucount($array, function($x){return $x===$value;});
}

/*
 * Function: self_url
 *
 * Gets current URL.
 *
 * From: http://dev.kanngard.net/Permalinks/ID_20050507183447.html
 */
function self_url() {
    $s = empty($_SERVER["HTTPS"]) ? ''
        : ($_SERVER["HTTPS"] == "on") ? "s"
        : "";
    $protocol = strleft(strtolower($_SERVER["SERVER_PROTOCOL"]), "/").$s;
    $port = ($_SERVER["SERVER_PORT"] == "80") ? ""
        : (":".$_SERVER["SERVER_PORT"]);
    return $protocol."://".$_SERVER['SERVER_NAME'].$port.$_SERVER['REQUEST_URI'];
}
function strleft($s1, $s2) {
    return substr($s1, 0, strpos($s1, $s2));
}

/*
 * Function: htmlesc
 * Escape HTML (shorter than htmlspecialchars)
 *
 * Parameters:
 *  $text - Input text.
 *
 * Returns:
 *  HTML
 */
function htmlesc($text)
{
    return htmlspecialchars($text, ENT_QUOTES, "UTF-8");
}

/*
 * Function: delete_directory
 * Delete a directory and all of its content.
 */
function delete_directory($dir)
{
    $dir_content = scandir($dir);
    foreach($dir_content as $f)
    {
        if(($f == "..") or ($f == "."))
            continue;

        $f = "$dir/$f";

        if(is_dir($f))
            delete_directory($f);
        else
            unlink($f);
    }
    rmdir($dir);
}

/*
 * Constant: SITE_BASE_PATH
 * The Base path of this ratatoeskr site.
 */
define("SITE_BASE_PATH", dirname(dirname(dirname(__FILE__))));