<?php

namespace Vn\Lib;

class Log
{
	private static $fd = NULL;
	private static $count;
	private static $file;

	static function init ($file)
	{
		self::close ();
		self::$file = $file;
		self::$fd = fopen ($file, 'a');
		self::rename ();
		set_error_handler ('Vn\Lib\Log::phpHandler', E_ALL);
	}
	static function phpHandler ($no, $str, $file, $line, $context)
	{
		self::write ('PHP: %s:%d: %s', $file, $line, $str);

		switch ($no)
		{
			case E_ERROR:
			case E_PARSE:
			case E_CORE_ERROR:
			case E_COMPILE_ERROR:
				self::write ('PHP: Could not continue, exiting.');
				self::close ();
				exit (1);
		}
		
		return TRUE;
	}
	static function close ()
	{
		if (self::$fd != NULL)
		{
			fclose (self::$fd);
			self::$fd = NULL;
		}
	}
	static function write ()
	{
		if (self::$fd == NULL)
			return;

		if (self::$count > 5000)
			self::rename ();

		self::$count += fprintf (self::$fd, "%s: %s\n"
			,strftime ('%Y-%m-%d %T')
			,call_user_func_array ('sprintf', func_get_args ())
		);
	}
	static private function rename ()
	{
		if (filesize (self::$file) > 1000000)
		{
			self::close ();
			$rename = self::$file.'.1';

			if (file_exists ($rename))
				unlink ($rename);

			rename (self::$file, $rename);
			self::$fd = fopen ($file, 'a');
		}
		
		self::$count = 0;
	}
}