<?php
/**
 * @author      Jan Altensen (Stricted)
 * @copyright   2013-2014 Jan Altensen (Stricted)
 * @license     GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
 */
class git {
	protected $repo;
	
	/**
	 * Constructs a new instance of git class.
	 *
	 * @param	string	$repo
	 */
	public function __construct ($repo) {
		$this->repo = $repo;
	}
	
	/*
	 * parse all commits from repo
	 *
	 * @param	integer	$count
	 * @param	string	$branch
	 * @return	array
	 */
	public function get_commits ($count = -1, $branch = "master") {
		$data = array();
		if (!$data) {
			$cmd = "git --git-dir=".$this->repo." rev-list --header --max-count=".$count." ".$branch." ";
			$rev_list = shell_exec($cmd);
			foreach(explode("\000", $rev_list) as $rev) {
				$commit = array();
				$rev_lines = explode("\n", str_replace("\r", "", $rev));
				$commit['id'] = $rev_lines[0];
				foreach($rev_lines as $rev_line) {
					if (substr($rev_line, 0, 4) == "    ") {
						if (isset($commit['text'])) {
							$commit['text'] .= "\n".substr($rev_line, 4);
						}
						else {
							$commit['text'] = substr($rev_line, 4);
						}
					}
					else {
						$opt = explode(" ", $rev_line, 2);
						if ($opt[0] == "tree") {
							$commit['tree'] = $opt[1];
						}
						else if ($opt[0] == "parent") {
							$commit['parent'][] = $opt[1];
						}
						else if ($opt[0] == "author") {
							preg_match('/(.*) <([^>]*)> ([0-9]*) ([+\-0-9]{5})/i', $opt[1], $matches);
							$commit['author'] = $matches[1];
							$commit['author_mail'] = $matches[2];
							$commit['author_time'] = $matches[3];
							$commit['author_timezone'] = $matches[4];
						}
						else if ($opt[0] == "committer") {
							preg_match('/(.*) <([^>]*)> ([0-9]*) ([+\-0-9]{5})/i', $opt[1], $matches);
							$commit['committer'] = $matches[1];
							$commit['committer_mail'] = $matches[2];
							$commit['committer_time'] = $matches[3];
							$commit['committer_timezone'] = $matches[4];
						}
					}
				}
				$data[] = $commit;
			}
		}
		return $data;
	}
	
	/*
	 * get latest commit hash
	 *
	 * @param	string	$branch
	 * @raturn	string
	 */
	public function get_hash ($branch = "master") {
		$hash = shell_exec('git --git-dir='.$this->repo.' rev-list -n 1 --pretty="format:%h" --header '.$branch.' | grep "^[0-9a-f]*$"');
		$hash = str_replace("\r","",str_replace("\n","",$hash));
		return $hash;
	}
	
	/*
	 * get commit count
	 *
	 * @param	string	$branch
	 * @raturn	integer
	 */
	public function get_count ($branch = "master") {
		$count = shell_exec('git --git-dir='.$this->repo.' rev-list --oneline --first-parent --header '.$branch.' | wc -l | sed "s/[ \t]//g"');
		$count = str_replace("\r","",str_replace("\n","",$count));
		return $count;
	}
	
	/*
	 * get commit version
	 *
	 * @param	string	$branch
	 * @raturn	string
	 */
	public function get_version ($branch = "master") {
		return "git-".$this->get_count($this->repo, $branch)."-".$this->get_hash($repo, $branch);
	}
	
	/*
	 * get commit age
	 *
	 * @param	string	$last_change
	 * @raturn	string
	 */
	public function get_age ($last_change) {
		$now = time();
		$age = ($last_change > 0 ? ($now - $last_change) : 0);
		
		if ($age > 60*60*24*365*2) {
			$age_str = floor($age/60/60/24/365);
			$age_str .= " years ago";
		}
		else if ($age > 60*60*24*(365/12)*2) {
			$age_str = floor($age/60/60/24/(365/12));
			$age_str .= " months ago";
		}
		else if ($age > 60*60*24*7*2) {
			$age_str = floor($age/60/60/24/7);
			$age_str .= " weeks ago";
		}
		else if ($age > 60*60*24*2) {
			$age_str = floor($age/60/60/24);
			$age_str .= " days ago";
		}
		else if ($age > 60*60*2) {
			$age_str = floor($age/60/60);
			$age_str .= " hours ago";
		}
		else if ($age > 60*2) {
			$age_str = floor($age/60);
			$age_str .= " min ago";
		}
		else if ($age > 2) {
			$age_str = $age;
			$age_str .= " sec ago";
		}
		else if ($age >= 0) {
			$age_str = "right now";
		}
		else {
			$age_str = "right now";
		}
		return $age_str;
	}
	
	/*
	 * get css class from age
	 *
	 * @param	string	$last_change
	 * @return	string
	 */
	public function get_age_class ($last_change) {
		$now = time();
		$age = ($last_change > 0 ? ($now - $last_change) : 0);
		
		if ($age == 0) {
			$age_class = "noage";
		}
		else if ($age < 60*60*2) {
			$age_class = "age0";
		}
		else if ($age < 60*60*24*2) {
			$age_class = "age1";
		}
		else {
			$age_class = "age2";
		}
		return $age_class;
	}
	
	/*
	 * pull current repo
	 */
	public function pull () {
		shell_exec("git --git-dir=".$this->repo." pull");
	}
	
	/*
	 * clone repo
	 */
	public function clone () {
		shell_exec("git clone --bare ".$this->repo);
	}
}
?>