<?php

/**
 * dibi - tiny'n'smart database abstraction layer
 * ----------------------------------------------
 *
 * Copyright (c) 2005, 2008 David Grudl (http://davidgrudl.com)
 *
 * This source file is subject to the "dibi license" that is bundled
 * with this package in the file license.txt.
 *
 * For more information please see http://dibiphp.com
 *
 * @copyright  Copyright (c) 2005, 2008 David Grudl
 * @license    http://dibiphp.com/license  dibi license
 * @link       http://dibiphp.com
 * @package    dibi
 * @version    $Id$
 */


/**
 * dibi basic logger & profiler (experimental).
 *
 * @author     David Grudl
 * @copyright  Copyright (c) 2005, 2008 David Grudl
 * @package    dibi
 */
final class DibiLogger extends /*Nette::*/Object
{
	/** @var string  Name of the file where SQL errors should be logged */
	private $file;

	/** @var bool */
	public $logErrors = TRUE;

	/** @var bool */
	public $logQueries = TRUE;


	/**
	 * @param  string  filename
	 */
	public function __construct($file)
	{
		$this->file = $file;
	}


	/**
	 * Event handler (events: exception, connected, beforeQuery, afterQuery, begin, commit, rollback).
	 *
	 * @param  DibiConnection
	 * @param  string event name
	 * @param  mixed
	 * @return void
	 */
	public function handler($connection, $event, $arg)
	{
		if ($event === 'afterQuery' && $this->logQueries) {
			$this->write(
				"OK: " . dibi::$sql
				. ($arg instanceof DibiResult ? ";\n-- rows: " . count($arg) : '')
				. "\n-- takes: " . sprintf('%0.3f', dibi::$elapsedTime * 1000) . ' ms'
				. "\n-- driver: " . $connection->getConfig('driver')
				. "\n-- " . date('Y-m-d H:i:s')
				. "\n\n"
			);
			return;
		}

		if ($event === 'exception' && $this->logErrors) {
			// $arg is DibiDriverException
			$message = $arg->getMessage();
			$code = $arg->getCode();
			if ($code) {
				$message = "[$code] $message";
			}

			$this->write(
				"ERROR: $message"
				. "\n-- SQL: " . dibi::$sql
				. "\n-- driver: " //. $connection->getConfig('driver')
				. ";\n-- " . date('Y-m-d H:i:s')
				. "\n\n"
			);
			return;
		}
	}


	private function write($message)
	{
		$handle = fopen($this->file, 'a');
		if (!$handle) return; // or throw exception?

		flock($handle, LOCK_EX);
		fwrite($handle, $message);
		fclose($handle);
	}

}