<?php
namespace Core;
set_time_limit(600);

use \Exception;

class File
{
    public static function readFile($file)
    {
        if (!file_exists($file)) {
            throw new Exception(
                sprintf('File "%s" does not exist.', $file)
            );
        }

        return fread(fopen($file, 'r'), filesize($file));
    }

    public static function writeFile($file, $content)
    {
        $fp = fopen($file, 'wb');
        if (!$fp) {
            throw new Exception(
                sprintf('Unable to write file "%s".', $file)
            );
        }

        fputs($fp, $content, strlen($content));
        fclose($fp);
    }

    public static function checkEmptyFolder($dir)
    {
        if (!is_readable($dir)) {
            throw new Exception("Directory ($dir) not readable.");
        }

        $handle = opendir($dir);

        while (false !== ($entry = readdir($handle))) {
            if ($entry != '.' && $entry != '..') {
                return false;
            }
        }

        closedir($handle);

        return true;
    }

    public static function removeDirectory($dir)
    {
        if (true === self::checkEmptyFolder($dir)) {
            rmdir($dir);
        } else {
            if (is_dir($dir)) {

                $objects = scandir($dir);

                foreach ($objects as $object) {
                    if ($object != '.' && $object != '..') {
                        if (filetype($dir . '/' . $object) == 'dir') {
                            self::removeDirectory($dir . '/' . $object);
                        } else {
                            unlink($dir . '/' . $object);
                        }
                    }
                }

                reset($objects);
                rmdir($dir);
            }
        }
    }

    public static function copyDirectory($source, $destination)
    {
        if (!file_exists($source)) {
            throw new Exception("Source ($source) doesn't exist.");
        }

        if (is_file($source)) {
            if (false === copy($source, $destination)) {
                throw new Exception('Permission denied.');
            }
        } elseif (is_dir($source)) {

            $dir = opendir($source);
            if (!is_readable($destination)) {
                if (false === mkdir($destination, 0777, true)) {
                    throw new Exception('Permission denied.');
                }
            }

            while (false !== ($file = readdir($dir))) {
                if ($file != '.' && $file != '..') {
                    self::copyDirectory($source . '/' . $file, $destination . '/' . $file);
                }
            }

            closedir($dir);
        }
    }

    public static function moveDirectory($source, $destination)
    {
        self::copyDirectory($source, $destination);
        self::removeDirectory($source);
    }

    public static function searchForFile($dir, $target)
    {
        $files = scandir($dir);
        $list = array();

        foreach ($files as $file) {
            if ($file != '.' && $file != '..') {
                if ($file === $target) {
                    $list[] = $dir . '/' . $file;
                }

                if (is_dir($dir . '/' . $file)) {
                    $subList = self::searchForFile($dir . '/' . $file, $target);
                    $list = array_merge($list, $subList);
                }
            }
        }

        return $list;
    }
}