<?php
/*************************** GITManagedWebpage **************************
 * Copyright (C) 2013       Philipp Kreil (pk910)                       *
 *                                                                      *
 * This program is free software: you can redistribute it and/or modify *
 * it under the terms of the GNU General Public License as published by *
 * the Free Software Foundation, either version 3 of the License, or    *
 * (at your option) any later version.                                  *
 *                                                                      *
 * This program is distributed in the hope that it will be useful,      *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of       *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
 * GNU General Public License for more details.                         *
 *                                                                      *
 * You should have received a copy of the GNU General Public License    *
 * along with this program. If not, see <http://www.gnu.org/licenses/>. *
 *                                                                      *
 ************************************************************************
 *
 *  GITManagedWebpage.class.php
 *
 * Functions to manage a Website using GIT Version Control
 *
 */

class GITManagedWebpage {
    const ERROR_CRITICAL = 1;
    

    private $giturl;
    private $workdir;
    
    public function __construct($giturl, $workdir = null) {
        if($workdir === null) {
            $workdir = dirname(__FILE__);
            if(!substr($workdir, -1) == "/")
                $workdir .= "/";
            $workdir .= ".gitmanaged/";
        }
        else if(!substr($workdir, -1) == "/")
            $workdir .= "/";
        
        $this->giturl = $giturl;
        $this->workdir = $workdir;
        
        //if(!file_exists($this->workdir) || !is_dir($this->workdir)) {
            if(file_exists($this->workdir) && !is_dir($this->workdir)) {
                $this->error(self::ERROR_CRITICAL, "local workdir (".htmlspecialchars($this->workdir).") is not a directory.");
                return;
            }
            $this->setupWorkdir();
        //}
    }
    
    /* private function gitcmd(...)
    * Execute a git command and return output
    */
    private function gitcmd() {
        $args = func_get_args();
        $argstr = "";
        foreach($args as $arg) {
            if(is_array($arg)) {
                foreach($arg as $subarg) {
                    $argstr .= " ".escapeshellarg($subarg);
                }
            } else
                $argstr .= " ".escapeshellarg($arg);
        }
        $gitcmd = 'git '.escapeshellarg('--git-dir='.$this->workdir.'/repository').$argstr;
        $output = shell_exec($gitcmd);
        return $output;
    }
    
    /* private function setupWorkdir()
    * Setup local GITManagedWebpage Work directory with git repository
    */
    private function setupWorkdir() {
        // check requirements
        $git_exec = shell_exec('which git');
        if(!preg_match('#git#', $git_exec)) {
            $this->error(self::ERROR_CRITICAL, "git not installed locally.");
            return;
        }
        
        mkdir($this->workdir);
        mkdir($this->workdir.'/repository');
        shell_exec('git clone '.escapeshellarg($this->giturl).' '.escapeshellarg($this->workdir.'/repository'));
        $gitok = $this->gitcmd("status");
        if(preg_match("#Not a git repository#", $gitok)) {
            rmdir($this->workdir.'/repository');
            rmdir($this->workdir);
            $this->error(self::ERROR_CRITICAL, "error cloning git repository.");
            return;
        }
        
        
    }
    
    /* public function update()
    * Pulls latest commit of active branch and overwrites local files
    */
    public function update() {
    
    }
    
}

?>