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<?php

/**
* This file is part of the Nette Framework (http://nette.org)
*
* Copyright (c) 2004 David Grudl (http://davidgrudl.com)
*
* For the full copyright and license information, please view
* the file license.txt that was distributed with this source code.
*/

namespace Nette\Diagnostics;

use Nette;



/**
* Debugger: displays and logs errors.
*
* Behavior is determined by two factors: mode & output
* - modes: production / development
* - output: HTML / AJAX / CLI / other (e.g. XML)
*
* @author David Grudl
*/
final class Debugger
{
/** @var bool in production mode is suppressed any debugging output */
public static $productionMode;

/** @var bool in console mode is omitted HTML output */
public static $consoleMode;

/** @var int timestamp with microseconds of the start of the request */
public static $time;

/** @var bool is AJAX request detected? */
private static $ajaxDetected;

/** @var string requested URI or command line */
public static $source;

/** @var string URL pattern mask to open editor */
public static $editor = 'editor://open/?file=%file&line=%line';

/** @var string command to open browser (use 'start ""' in Windows) */
public static $browser;

/********************* Debugger::dump() ****************d*g**/

/** @var int how many nested levels of array/object properties display {@link Debugger::dump()} */
public static $maxDepth = 3;

/** @var int how long strings display {@link Debugger::dump()} */
public static $maxLen = 150;

/** @var bool display location? {@link Debugger::dump()} */
public static $showLocation = FALSE;

/** @var array */
public static $consoleColors = array(
'bool' => '1;33',
'null' => '1;33',
'int' => '1;36',
'float' => '1;36',
'string' => '1;32',
'array' => '1;31',
'key' => '1;37',
'object' => '1;31',
'visibility' => '1;30',
'resource' => '1;37',
);

/********************* errors and exceptions reporting ****************d*g**/

/** server modes {@link Debugger::enable()} */
const DEVELOPMENT = FALSE,
PRODUCTION = TRUE,
DETECT = NULL;

/** @var BlueScreen */
public static $blueScreen;

/** @var bool|int determines whether any error will cause immediate death; if integer that it's matched against error severity */
public static $strictMode = FALSE; // $immediateDeath

/** @var bool disables the @ (shut-up) operator so that notices and warnings are no longer hidden */
public static $scream = FALSE;

/** @var array of callables specifies the functions that are automatically called after fatal error */
public static $onFatalError = array();

/** @var bool {@link Debugger::enable()} */
private static $enabled = FALSE;

/** @var mixed {@link Debugger::tryError()} FALSE means catching is disabled */
private static $lastError = FALSE;

/********************* logging ****************d*g**/

/** @var Logger */
public static $logger;

/** @var FireLogger */
public static $fireLogger;

/** @var string name of the directory where errors should be logged; FALSE means that logging is disabled */
public static $logDirectory;

/** @var string email to sent error notifications */
public static $email;

/** @deprecated */
public static $mailer;

/** @deprecated */
public static $emailSnooze;

/** @var string */
public static $intermediateDebugFile;

/********************* debug bar ****************d*g**/

/** @var Bar */
public static $bar;

/** @var DefaultBarPanel */
private static $errorPanel;

/** @var DefaultBarPanel */
private static $dumpPanel;

/********************* Firebug extension ****************d*g**/

/** {@link Debugger::log()} and {@link Debugger::fireLog()} */
const DEBUG = 'debug',
INFO = 'info',
WARNING = 'warning',
ERROR = 'error',
CRITICAL = 'critical';



/**
* Static class - cannot be instantiated.
*/
final public function __construct()
{
throw new Nette\StaticClassException;
}



/**
* Static class constructor.
* @internal
*/
public static function _init()
{
self::$time = isset($_SERVER['REQUEST_TIME_FLOAT']) ? $_SERVER['REQUEST_TIME_FLOAT'] : microtime(TRUE);
self::$consoleMode = PHP_SAPI === 'cli';
self::$productionMode = self::DETECT;
if (self::$consoleMode) {
self::$source = empty($_SERVER['argv']) ? 'cli' : 'cli: ' . implode(' ', $_SERVER['argv']);
} else {
self::$ajaxDetected = isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] === 'XMLHttpRequest';
if (isset($_SERVER['REQUEST_URI'])) {
self::$source = (isset($_SERVER['HTTPS']) && strcasecmp($_SERVER['HTTPS'], 'off') ? 'https://' : 'http://')
. (isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : (isset($_SERVER['SERVER_NAME']) ? $_SERVER['SERVER_NAME'] : ''))
. $_SERVER['REQUEST_URI'];
}
}

self::$logger = new Logger;
self::$logDirectory = & self::$logger->directory;
self::$email = & self::$logger->email;
self::$mailer = & self::$logger->mailer;
self::$emailSnooze = & Logger::$emailSnooze;

self::$fireLogger = new FireLogger;

self::$blueScreen = new BlueScreen;
self::$blueScreen->addPanel(function($e) {
if ($e instanceof Nette\Templating\FilterException) {
return array(
'tab' => 'Template',
'panel' => '<p><b>File:</b> ' . Helpers::editorLink($e->sourceFile, $e->sourceLine)
. '&nbsp; <b>Line:</b> ' . ($e->sourceLine ? $e->sourceLine : 'n/a') . '</p>'
. ($e->sourceLine ? BlueScreen::highlightFile($e->sourceFile, $e->sourceLine) : '')
);
} elseif ($e instanceof Nette\Utils\NeonException && preg_match('#line (\d+)#', $e->getMessage(), $m)) {
if ($item = Helpers::findTrace($e->getTrace(), 'Nette\Config\Adapters\NeonAdapter::load')) {
return array(
'tab' => 'NEON',
'panel' => '<p><b>File:</b> ' . Helpers::editorLink($item['args'][0], $m[1]) . '&nbsp; <b>Line:</b> ' . $m[1] . '</p>'
. BlueScreen::highlightFile($item['args'][0], $m[1])
);
} elseif ($item = Helpers::findTrace($e->getTrace(), 'Nette\Utils\Neon::decode')) {
return array(
'tab' => 'NEON',
'panel' => BlueScreen::highlightPhp($item['args'][0], $m[1])
);
}
}
});

self::$bar = new Bar;
self::$bar->addPanel(new DefaultBarPanel('time'));
self::$bar->addPanel(new DefaultBarPanel('memory'));
self::$bar->addPanel(self::$errorPanel = new DefaultBarPanel('errors')); // filled by _errorHandler()
self::$bar->addPanel(self::$dumpPanel = new DefaultBarPanel('dumps')); // filled by barDump()
}



/********************* errors and exceptions reporting ****************d*g**/



/**
* Enables displaying or logging errors and exceptions.
* @param mixed production, development mode, autodetection or IP address(es) whitelist.
* @param string error log directory; enables logging in production mode, FALSE means that logging is disabled
* @param string administrator email; enables email sending in production mode
* @return void
*/
public static function enable($mode = NULL, $logDirectory = NULL, $email = NULL)
{
error_reporting(E_ALL | E_STRICT);

// production/development mode detection
if (is_bool($mode)) {
self::$productionMode = $mode;

} elseif ($mode !== self::DETECT || self::$productionMode === NULL) { // IP addresses or computer names whitelist detection
$list = is_string($mode) ? preg_split('#[,\s]+#', $mode) : (array) $mode;
if (!isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
$list[] = '127.0.0.1';
$list[] = '::1';
}
self::$productionMode = !in_array(isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : php_uname('n'), $list, TRUE);
}

// logging configuration
if (is_string($logDirectory)) {
self::$logDirectory = realpath($logDirectory);
if (self::$logDirectory === FALSE) {
die(__METHOD__ . "() error: Log directory is not found or is not directory.");
}
} elseif ($logDirectory === FALSE) {
self::$logDirectory = FALSE;

} elseif (self::$logDirectory === NULL) {
self::$logDirectory = defined('APP_DIR') ? APP_DIR . '/../log' : getcwd() . '/log';
}
if (self::$logDirectory) {
ini_set('error_log', self::$logDirectory . '/php_error.log');
}
if (isset($_SERVER['HTTP_NETTE_DEBUG_HELPER'])) {
$dir = TEMP_DIR . '/_Nette.DebugHelper';
if (!file_exists($dir)) {
mkdir($dir);
}
self::$intermediateDebugFile = tempnam($dir, $_SERVER['HTTP_NETTE_DEBUG_HELPER']);
if (!headers_sent()) {
header("Nette-Debug-Nonce: " . basename(self::$intermediateDebugFile));
}
}

// php configuration
if (function_exists('ini_set')) {
ini_set('display_errors', !self::$productionMode); // or 'stderr'
ini_set('html_errors', FALSE);
ini_set('log_errors', FALSE);

} elseif (ini_get('display_errors') != !self::$productionMode && ini_get('display_errors') !== (self::$productionMode ? 'stderr' : 'stdout')) { // intentionally ==
die(__METHOD__ . "() error: Unable to set 'display_errors' because function ini_set() is disabled.");
}

if ($email) {
if (!is_string($email)) {
die(__METHOD__ . '() error: Email address must be a string.');
}
self::$email = $email;
}

if (!self::$enabled) {
register_shutdown_function(array(__CLASS__, '_shutdownHandler'));
set_exception_handler(array(__CLASS__, '_exceptionHandler'));
set_error_handler(array(__CLASS__, '_errorHandler'));
self::$enabled = TRUE;
}
}



/**
* Is Debug enabled?
* @return bool
*/
public static function isEnabled()
{
return self::$enabled;
}



/**
* Logs message or exception to file (if not disabled) and sends email notification (if enabled).
* @param string|Exception
* @param int one of constant Debugger::INFO, WARNING, ERROR (sends email), CRITICAL (sends email)
* @return string logged error filename
*/
public static function log($message, $priority = self::INFO)
{
if (self::$logDirectory === FALSE) {
return;

} elseif (!self::$logDirectory) {
throw new Nette\InvalidStateException('Logging directory is not specified in Nette\Diagnostics\Debugger::$logDirectory.');
}

if ($message instanceof \Exception) {
$exception = $message;
$message = ($message instanceof Nette\FatalErrorException
? 'Fatal error: ' . $exception->getMessage()
: get_class($exception) . ": " . $exception->getMessage())
. " in " . $exception->getFile() . ":" . $exception->getLine();

$hash = md5($exception /*5.2*. (method_exists($exception, 'getPrevious') ? $exception->getPrevious() : (isset($exception->previous) ? $exception->previous : ''))*/);
$exceptionFilename = "exception-" . @date('Y-m-d-H-i-s') . "-$hash.html";
foreach (new \DirectoryIterator(self::$logDirectory) as $entry) {
if (strpos($entry, $hash)) {
$exceptionFilename = $entry;
$saved = TRUE;
break;
}
}
} elseif (!is_string($message)) {
$message = Helpers::textDump($message);
}

self::$logger->log(array(
@date('[Y-m-d H-i-s]'),
trim($message),
self::$source ? ' @ ' . self::$source : NULL,
!empty($exceptionFilename) ? ' @@ ' . $exceptionFilename : NULL
), $priority);

if (!empty($exceptionFilename)) {
$exceptionFilename = self::$logDirectory . '/' . $exceptionFilename;
if (empty($saved) && $logHandle = @fopen($exceptionFilename, 'w')) {
ob_start(); // double buffer prevents sending HTTP headers in some PHP
ob_start(function($buffer) use ($logHandle) { fwrite($logHandle, $buffer); }, 4096);
self::$blueScreen->render($exception);
ob_end_flush();
ob_end_clean();
fclose($logHandle);
}
return strtr($exceptionFilename, '\\/', DIRECTORY_SEPARATOR . DIRECTORY_SEPARATOR);
}
}



/**
* Shutdown handler to catch fatal errors and execute of the planned activities.
* @return void
* @internal
*/
public static function _shutdownHandler()
{
if (!self::$enabled) {
return;
}

// fatal error handler
static $types = array(
E_ERROR => 1,
E_CORE_ERROR => 1,
E_COMPILE_ERROR => 1,
E_PARSE => 1,
);
$error = error_get_last();
if (isset($types[$error['type']])) {
self::_exceptionHandler(new Nette\FatalErrorException($error['message'], 0, $error['type'], $error['file'], $error['line'], NULL, NULL, isset($error['trace']) ? $error['trace'] : NULL));
}

// debug bar (requires development mode)
if (!connection_aborted() && self::$bar && !self::$productionMode) {
if(self::isHtmlMode()) {
self::$bar->render();

} elseif (self::$intermediateDebugFile) {
file_put_contents(self::$intermediateDebugFile, self::$bar->__toString());
@chmod(self::$intermediateDebugFile, 0666);
}
}
}



/**
* Handler to catch uncaught exception.
* @param \Exception
* @return void
* @internal
*/
public static function _exceptionHandler(\Exception $exception)
{
if (!headers_sent()) { // for PHP < 5.2.4
$protocol = isset($_SERVER['SERVER_PROTOCOL']) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.1';
header($protocol . ' 500', TRUE, 500);
}

try {
if (self::$productionMode) {
try {
self::log($exception, self::ERROR);
} catch (\Exception $e) {
echo 'FATAL ERROR: unable to log error';
}

if (self::$consoleMode) {
echo "ERROR: the server encountered an internal error and was unable to complete your request.\n";

} elseif (self::isHtmlMode()) {
require __DIR__ . '/templates/error.phtml';
}

} else {
if (self::$consoleMode) { // dump to console
echo "$exception\n";
if ($file = self::log($exception)) {
echo "(stored in $file)\n";
if (self::$browser) {
exec(self::$browser . ' ' . escapeshellarg($file));
}
}

} elseif (!connection_aborted() && self::isHtmlMode()) { // dump to browser
self::$blueScreen->render($exception);
if (self::$bar) {
self::$bar->render();
}

} elseif (!self::fireLog($exception, self::ERROR)) { // AJAX or non-HTML mode
$file = basename(self::log($exception));
if (!headers_sent()) {
header("X-Nette-Error-Log: $file");
}
}
}

foreach (self::$onFatalError as $handler) {
call_user_func($handler, $exception);
}

} catch (\Exception $e) {
if (self::$productionMode) {
echo self::isHtmlMode() ? '<meta name=robots content=noindex>FATAL ERROR' : 'FATAL ERROR';
} else {
echo "FATAL ERROR: thrown ", get_class($e), ': ', $e->getMessage(),
"\nwhile processing ", get_class($exception), ': ', $exception->getMessage(), "\n";
}
}

self::$enabled = FALSE; // un-register shutdown function
exit(255);
}



/**
* Handler to catch warnings and notices.
* @param int level of the error raised
* @param string error message
* @param string file that the error was raised in
* @param int line number the error was raised at
* @param array an array of variables that existed in the scope the error was triggered in
* @return bool FALSE to call normal error handler, NULL otherwise
* @throws Nette\FatalErrorException
* @internal
*/
public static function _errorHandler($severity, $message, $file, $line, $context)
{
if (self::$scream) {
error_reporting(E_ALL | E_STRICT);
}

if (self::$lastError !== FALSE && ($severity & error_reporting()) === $severity) { // tryError mode
self::$lastError = new \ErrorException($message, 0, $severity, $file, $line);
return NULL;
}

if ($severity === E_RECOVERABLE_ERROR || $severity === E_USER_ERROR) {
if (Helpers::findTrace(/*5.2*PHP_VERSION_ID < 50205 ? debug_backtrace() : */debug_backtrace(FALSE), '*::__toString')) {
$previous = isset($context['e']) && $context['e'] instanceof \Exception ? $context['e'] : NULL;
self::_exceptionHandler(new Nette\FatalErrorException($message, 0, $severity, $file, $line, $context, $previous));
}
throw new Nette\FatalErrorException($message, 0, $severity, $file, $line, $context);

} elseif (($severity & error_reporting()) !== $severity) {
return FALSE; // calls normal error handler to fill-in error_get_last()

} elseif (!self::$productionMode && (is_bool(self::$strictMode) ? self::$strictMode : ((self::$strictMode & $severity) === $severity))) {
self::_exceptionHandler(new Nette\FatalErrorException($message, 0, $severity, $file, $line, $context));
}

static $types = array(
E_WARNING => 'Warning',
E_COMPILE_WARNING => 'Warning', // currently unable to handle
E_USER_WARNING => 'Warning',
E_NOTICE => 'Notice',
E_USER_NOTICE => 'Notice',
E_STRICT => 'Strict standards',
);
if (PHP_VERSION_ID >= 50300) {
$types += array(
E_DEPRECATED => 'Deprecated',
E_USER_DEPRECATED => 'Deprecated',
);
}

$message = 'PHP ' . (isset($types[$severity]) ? $types[$severity] : 'Unknown error') . ": $message";
$count = & self::$errorPanel->data["$message|$file|$line"];

if ($count++) { // repeated error
return NULL;

} elseif (self::$productionMode) {
self::log("$message in $file:$line", self::ERROR);
return NULL;

} else {
$ok = self::fireLog(new \ErrorException($message, 0, $severity, $file, $line), self::WARNING);
return !self::isHtmlMode() || (!self::$bar && !$ok) ? FALSE : NULL;
}

return FALSE; // call normal error handler
}



/** @deprecated */
public static function toStringException(\Exception $exception)
{
if (self::$enabled) {
self::_exceptionHandler($exception);
} else {
trigger_error($exception->getMessage(), E_USER_ERROR);
}
}



/** @deprecated */
public static function tryError()
{
trigger_error(__METHOD__ . '() is deprecated; use own error handler instead.', E_USER_DEPRECATED);
if (!self::$enabled && self::$lastError === FALSE) {
set_error_handler(array(__CLASS__, '_errorHandler'));
}
self::$lastError = NULL;
}



/** @deprecated */
public static function catchError(& $error)
{
trigger_error(__METHOD__ . '() is deprecated; use own error handler instead.', E_USER_DEPRECATED);
if (!self::$enabled && self::$lastError !== FALSE) {
restore_error_handler();
}
$error = self::$lastError;
self::$lastError = FALSE;
return (bool) $error;
}



/********************* useful tools ****************d*g**/



/**
* Dumps information about a variable in readable format.
* @param mixed variable to dump
* @param bool return output instead of printing it? (bypasses $productionMode)
* @return mixed variable itself or dump
*/
public static function dump($var, $return = FALSE)
{
if (!$return && self::$productionMode) {
return $var;
}

$output = "<pre class=\"nette-dump\">" . Helpers::htmlDump($var) . "</pre>\n";

if (!$return) {
$trace = /*5.2*PHP_VERSION_ID < 50205 ? debug_backtrace() : */debug_backtrace(FALSE);
$item = Helpers::findTrace($trace, 'dump') ?: Helpers::findTrace($trace, __CLASS__ . '::dump');
if (isset($item['file'], $item['line']) && is_file($item['file'])) {
$lines = file($item['file']);
preg_match('#dump\((.*)\)#', $lines[$item['line'] - 1], $m);
$output = substr_replace(
$output,
' title="' . htmlspecialchars((isset($m[0]) ? "$m[0] \n" : '') . "in file {$item['file']} on line {$item['line']}") . '"',
4, 0);

if (self::$showLocation) {
$output = substr_replace(
$output,
' <small>in ' . Helpers::editorLink($item['file'], $item['line']) . ":{$item['line']}</small>",
-8, 0);
}
}
}

if (self::$consoleMode) {
if (self::$consoleColors && substr(getenv('TERM'), 0, 5) === 'xterm') {
$output = preg_replace_callback('#<span class="nette-(\w+)">|</span>#', function($m) {
return "\033[" . (isset($m[1], Debugger::$consoleColors[$m[1]]) ? Debugger::$consoleColors[$m[1]] : '0') . "m";
}, $output);
}
$output = htmlspecialchars_decode(strip_tags($output), ENT_QUOTES);
}

if ($return) {
return $output;

} else {
echo $output;
return $var;
}
}



/**
* Starts/stops stopwatch.
* @param string name
* @return float elapsed seconds
*/
public static function timer($name = NULL)
{
static $time = array();
$now = microtime(TRUE);
$delta = isset($time[$name]) ? $now - $time[$name] : 0;
$time[$name] = $now;
return $delta;
}



/**
* Dumps information about a variable in Nette Debug Bar.
* @param mixed variable to dump
* @param string optional title
* @return mixed variable itself
*/
public static function barDump($var, $title = NULL)
{
if (!self::$productionMode) {
$dump = array();
foreach ((is_array($var) ? $var : array('' => $var)) as $key => $val) {
$dump[$key] = Helpers::clickableDump($val);
}
self::$dumpPanel->data[] = array('title' => $title, 'dump' => $dump);
}
return $var;
}



/**
* Sends message to FireLogger console.
* @param mixed message to log
* @return bool was successful?
*/
public static function fireLog($message)
{
if (!self::$productionMode) {
return self::$fireLogger->log($message);
}
}



private static function isHtmlMode()
{
return !self::$ajaxDetected && !self::$consoleMode
&& !preg_match('#^Content-Type: (?!text/html)#im', implode("\n", headers_list()));
}



/** @deprecated */
public static function addPanel(IBarPanel $panel, $id = NULL)
{
return self::$bar->addPanel($panel, $id);
}

}
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