<?php
/**
 * GENERAL CLASS TO FETCH DATA FROM A SHELL COMMAND 
 * FOR THE WEB UI
 * 
 * Used in ../plugins/shellcmd/getdata.php
 * 
 * 2024-08-23  v1.1  Axel Hahn  php8 only; added variable types
 */

require_once('plugins.class.php');

class req_shellcmd
{

    /**
     * plugin name
     * @var string
     */
    protected string $_sPlugin = '';

    /**
     * pligin object
     * @var object
     */
    protected object $_oPlugin;

    /**
     * Array of return items
     * TODO: might be removed
     * @var array
    protected array $_aReturn = [];
     */

    /**
     * Configuration for the plugin
     * @var array
     */
    protected array $_aPluginConfig = [];

    /**
     * Result after execution
     * @var array
     */
    protected array $_aResult = [];

    /**
     * Flag: enable debug? Default: false
     * @var bool
     */
    protected bool $_debug = false;

    /**
     * ciplugins class instance
     * @var object
     */
    protected $CI_plugins = false;

    // ---------------------------------------------------------------
    // CONSTRUCTOR
    // ---------------------------------------------------------------

    /**
     * Constructor
     */
    public function __construct()
    {
        $this->detectPlugin();
    }

    // ---------------------------------------------------------------
    // PRIVATE METHODS
    // ---------------------------------------------------------------

    /**
     * Helper: execute a given command and return array with executed
     * command, returncode, output
     * @param  string  $sCmd  command to execute
     * @return
     */
    protected function _execCommand(string $sCmd): array
    {
        exec("$sCmd", $aOut, $iResult);
        return [
            'command' => $sCmd,
            'exitcode' => $iResult,
            'time' => date("H:i:s"),
            'output' => $aOut,
        ];
    }


    /**
     * Initialize the shellcmd plugin
     * @returm boolean
     */
    protected function _loadPlugin(): bool
    {
        $this->CI_plugins = new ciplugins();
        $this->CI_plugins->setPlugin($this->_sPlugin, 'shellcmd');

        $sPluginclass = $this->CI_plugins->getPluginClassname();
        $this->_oPlugin = new $sPluginclass();

        return true;
    }

    /**
     * Write debug output ... if enabled
     * @return void
     */
    protected function _wd($s): void
    {
        echo $this->_debug ? 'DEBUG ' . __CLASS__ . ' ' . $s . "<br>\n" : '';
    }

    // ---------------------------------------------------------------
    // PUBLIC METHODS
    // ---------------------------------------------------------------

    /**
     * Detect plugin name to load from GET param "plugin"
     * @return bool
     */
    public function detectPlugin(): bool
    {
        $this->_sPlugin = isset($_GET['plugin']) && $_GET['plugin'] ? preg_replace('/^a-z0-9/', '', $_GET['plugin']) : false;
        $this->_wd("detected plugin: " . $this->_sPlugin);
        return true;
    }

    /**
     * Get data from plugin command and return array with executed
     * command, returncode, output, parsed data
     * @return array
     */
    public function get(): array
    {
        $this->_loadPlugin();
        if (!$this->_oPlugin) {
            // return $this->_aReturn;
            return [];
        }
        $this->CI_plugins->getPluginConfig();
        $sCmd = $this->CI_plugins->getConfigitem('command');
        $this->_wd("sCmd=$sCmd");

        $this->_aResult = $this->_execCommand($sCmd);
        if (method_exists($this->_oPlugin, "parsedata")) {
            $this->_aResult = $this->_oPlugin->parsedata($this->_aResult);
        }
        return $this->_aResult;
    }

    /**
     * Send response as json.
     * It sends http response header and json data in body
     * @return void
     */
    public function sendResponse(): void
    {
        header('Content-Type: application/json');
        echo json_encode($this->get(), JSON_PRETTY_PRINT);
    }

}