<?php

class Upgrade
{
    public $web_dir;
    private $temp_dir;
    public static $upgrade_available;
    public static $last_check;
    public $error;
    public static $latest_version;
    function __construct()
    {
        global $config;
        read_config_db();
        if (!get_config('upgrade'))
        {
            $config['upgrade'] =[];
            write_config('upgrade');
        }
        
        $tok = split(__DIR__, '/');
        unset($tok[count($tok) - 1]);
        $this->web_dir = implode('/',$tok).'/';
        
        /** prepare the temp directory */
        $temp_dir = "~/panel_upgrade";
        $temp_dir .= ($temp_dir[strlen($temp_dir) - 1] != '/') ? "/uawp" : "uawp";
        array_map('unlink', array_filter((array) glob("$temp_dir/*.*")));
        array_map('rmdir', array_filter((array) glob("$temp_dir/*")));
        rmdir($temp_dir);
        $mkdir = mkdir($temp_dir, 0755, true);

        $this->temp_dir = $mkdir ? $temp_dir : NULL;
        $this->error = $mkdir ? NULL : "Could not create directory: $temp_dir";
        Upgrade::$upgrade_available = false;
        if ($this->error)
            error_log($this->error);
    }
    
    /** Checks for a new upgrade */
    function checkForNew()
    {
        global $config;
        read_config_db();
        if (time() - $config['upgrade']['last_check'] < 300) // only check every 15 mins
            return false;
        error_log(time()." - ".$config['upgrade']['last_check']." = ".time()-$config['upgrade']['last_check']);
        // Define the API URL to check for updates
        $apiUrl = "https://api.github.com/repos/unrealircd/unrealircd-webpanel/releases"; // Replace with your API URL
        $response = file_get_contents($apiUrl, false, stream_context_create(["http" => ["method" => "GET", "header" => "User-agent: UnrealIRCd Webpanel"]]));
        if ($response === false)
        {
            $this->error = "Couldn't check github.";
            return false;
        }
        $data = json_decode($response, true);
        $latest = $data[count($data) - 1];
        $config['upgrade']['latest_version'] = $latest['tag_name'];
        $config['upgrade']['last_check'] = time();
        $config['upgrade']['download_link'] = $latest['zipball_url'];
        write_config('upgrade');
        Upgrade::$upgrade_available = (float)$latest['tag_name'] > WEBPANEL_VERSION ? true : false;
    }
    
    function downloadUpgradeZip()
    {
        $ch = curl_init(get_config('upgrade::download_link'));
        $fp = fopen("$this->temp_dir/unrealircd-webpanel-upgrade.zip", 'w+');
    
        curl_setopt($ch, CURLOPT_FILE, $fp);
        curl_setopt($ch, CURLOPT_TIMEOUT, 60);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'User-Agent: UnrealIRCd Webpanel',
        ]);
        $success = curl_exec($ch);
        $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        
        if ($code == "403" || $code == "404" || $code == "200")
        {
            $this->error ="Unable to download";
        }
        curl_close($ch);
        fclose($fp);
    
        return $success;
    }
    function extractZip() {
        $zip = new ZipArchive;
        if ($zip->open("$this->temp_dir/unrealircd-webpanel-upgrade.zip") === true)
        {
            $zip->extractTo("$this->temp_dir/");
            $zip->close();
            return true;
        } else {
            return false;
        }
    }
    function cleanupOldFiles()
    {
        $currentFiles = $this->listFiles($this->web_dir);
        $updateFiles = $this->listFiles($this->temp_dir);
    
        $filesToDelete = array_diff($currentFiles, $updateFiles);
    
        foreach ($filesToDelete as $file)
        {
            error_log($file);
            //unlink("$b$file");
        }

    }
    
    function extractToWebdir()
    {
        $zip = new ZipArchive;
        if ($zip->open("$this->temp_dir/unrealircd-webpanel-upgrade.zip") === true)
        {
            $extracted = $zip->extractTo(str_replace('//','/',get_config('base_url')));
            $zip->close();
            if (!$extracted)
            {
                error_log("Cannot extract to web directory. Permission denied.");
                return false;
            }
            array_map('unlink', array_filter((array) glob("$this->temp_dir/*.*")));
            array_map('rmdir', array_filter((array) glob("$this->temp_dir/*.*")));
            return true;
        } else {
            return false;
        }
    }
    function listFiles($dir) {
        $files = [];
        $iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($dir));
        foreach ($iterator as $file)
        {
            if ($file->isFile())
            {
                $files[] = str_replace($dir . DIRECTORY_SEPARATOR, '', $file->getPathname());
            }
        }
        return $files;
    }
}