<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */
namespace app\modules\sys\log;

use Yii;
use yii\base\Application;
use yii\base\InvalidConfigException;
use yii\helpers\FileHelper;
use yii\log\Target;
use yii\log\Logger;
use yii\helpers\VarDumper;

/**
 * FileTarget records log messages in a file.
 *
 * The log file is specified via [[logFile]]. If the size of the log file exceeds
 * [[maxFileSize]] (in kilo-bytes), a rotation will be performed, which renames
 * the current log file by suffixing the file name with '.1'. All existing log
 * files are moved backwards by one place, i.e., '.2' to '.3', '.1' to '.2', and so on.
 * The property [[maxLogFiles]] specifies how many history files to keep.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class Log extends Target
{
    /**
     * @var string log file path or path alias. If not set, it will use the "@runtime/logs/app.log" file.
     * The directory containing the log files will be automatically created if not existing.
     */
    public $logFile;
    /**
     * @var bool whether log files should be rotated when they reach a certain [[maxFileSize|maximum size]].
     * Log rotation is enabled by default. This property allows you to disable it, when you have configured
     * an external tools for log rotation on your server.
     * @since 2.0.3
     */
    public $enableRotation = true;
    /**
     * @var int maximum log file size, in kilo-bytes. Defaults to 10240, meaning 10MB.
     */
    public $maxFileSize = 10240; // in KB
    /**
     * @var int number of log files used for rotation. Defaults to 5.
     */
    public $maxLogFiles = 5;
    /**
     * @var int the permission to be set for newly created log files.
     * This value will be used by PHP chmod() function. No umask will be applied.
     * If not set, the permission will be determined by the current environment.
     */
    public $fileMode;
    /**
     * @var int the permission to be set for newly created directories.
     * This value will be used by PHP chmod() function. No umask will be applied.
     * Defaults to 0775, meaning the directory is read-writable by owner and group,
     * but read-only for other users.
     */
    public $dirMode = 0775;
    /**
     * @var bool Whether to rotate log files by copy and truncate in contrast to rotation by
     * renaming files. Defaults to `true` to be more compatible with log tailers and is windows
     * systems which do not play well with rename on open files. Rotation by renaming however is
     * a bit faster.
     *
     * The problem with windows systems where the [rename()](http://www.php.net/manual/en/function.rename.php)
     * function does not work with files that are opened by some process is described in a
     * [comment by Martin Pelletier](http://www.php.net/manual/en/function.rename.php#102274) in
     * the PHP documentation. By setting rotateByCopy to `true` you can work
     * around this problem.
     */
    public $rotateByCopy = true;

    /**
     * 自定义的日志等级
     */
    const LEVEL_DATA = 0x80;

    private $_levels = 0;

    /**
     * Initializes the route.
     * This method is invoked after the route is created by the route manager.
     */
    public function init()
    {
        parent::init();
        if ($this->logFile === null) {
            $this->logFile = Yii::$app->getRuntimePath() . '/logs/app.log';
        } else {
            $this->logFile = Yii::getAlias($this->logFile);
        }

        $logPath = dirname($this->logFile);
        if (!is_dir($logPath)) {
            FileHelper::createDirectory($logPath, $this->dirMode, true);
        }

        if ($this->maxLogFiles < 1) {
            $this->maxLogFiles = 1;
        }
        if ($this->maxFileSize < 1) {
            $this->maxFileSize = 1;
        }
    }

    /**
     * Writes log messages to a file.
     * @throws InvalidConfigException if unable to open the log file for writing
     */
    public function export()
    {
        $text = implode("\n", array_map([$this, 'formatMessage'], $this->messages)) . "\n";
        if (($fp = @fopen($this->logFile, 'a')) === false) {
            throw new InvalidConfigException("Unable to append to log file: {$this->logFile}");
        }

        @flock($fp, LOCK_EX);
        if ($this->enableRotation) {
            // clear stat cache to ensure getting the real current file size and not a cached one
            // this may result in rotating twice when cached file size is used on subsequent calls
            clearstatcache();
        }
        if ($this->enableRotation && @filesize($this->logFile) > $this->maxFileSize * 1024) {
            $this->rotateFiles();
            @flock($fp, LOCK_UN);
            @fclose($fp);
            @file_put_contents($this->logFile, $text, FILE_APPEND | LOCK_EX);
        } else {
            @fwrite($fp, $text);
            @flock($fp, LOCK_UN);
            @fclose($fp);
        }
        if ($this->fileMode !== null) {
            @chmod($this->logFile, $this->fileMode);
        }
    }

    /**
     * Rotates log files.
     */
    protected function rotateFiles()
    {
        $file = $this->logFile;
        for ($i = $this->maxLogFiles; $i >= 0; --$i) {
            // $i == 0 is the original log file
            $rotateFile = $file . ($i === 0 ? '' : '.' . $i);
            if (is_file($rotateFile)) {
                // suppress errors because it's possible multiple processes enter into this section
                if ($i === $this->maxLogFiles) {
                    @unlink($rotateFile);
                } else {
                    if ($this->rotateByCopy) {
                        @copy($rotateFile, $file . '.' . ($i + 1));
                        if ($fp = @fopen($rotateFile, 'a')) {
                            @ftruncate($fp, 0);
                            @fclose($fp);
                        }
                        if ($this->fileMode !== null) {
                            @chmod($file . '.' . ($i + 1), $this->fileMode);
                        }
                    } else {
                        @rename($rotateFile, $file . '.' . ($i + 1));
                    }
                }
            }
        }
    }


    /**
     * Formats a log message for display as a string.
     * @param array $message the log message to be formatted.
     * The message structure follows that in [[Logger::messages]].
     * @return string the formatted message
     */
    public function formatMessage($message)
    {
        list($text, $levelNum, $category, $timestamp) = $message;
        $intLevel = $levelNum;
        $level = Logger::getLevelName($levelNum);
        if ($level == 'unknown') {
            $level = self::getLevelName($levelNum);
        }
        if (!is_string($text)) {
            // exceptions may not be serializable if in the call stack somewhere is a Closure
            if ($text instanceof \Throwable || $text instanceof \Exception) {
                $text = (string) $text;
            } else {
                $text = VarDumper::export($text);
            }
        }

        $traces = [];
        if (isset($message[4])) {
            foreach ($message[4] as $trace) {
                $traces[] = "in {$trace['file']}:{$trace['line']}";
            }
        }

        $prefix = $this->getMessagePrefix($message);
        if ($intLevel == self::LEVEL_DATA) {
            return date('Y-m-d H:i:s', $timestamp) . " - $text";
        } elseif ($intLevel == Logger::LEVEL_ERROR || $intLevel == Logger::LEVEL_WARNING) {
            if (isset($_POST['vin_base64'])) {
                unset($_POST['vin_base64']);
            }
            $useTime = $_SERVER['REQUEST_TIME'] - time();
            return date('Y-m-d H:i:s', $timestamp) . " " . Yii::$app->request->getPathInfo()
            . " " . $useTime . "s $text"
            . (empty($traces) ? '' : "\n" . implode("\n", $traces)) . "\n {$prefix}[$level][$category] \$_POST=".json_encode($_POST, JSON_UNESCAPED_UNICODE);
        }
    }

    public static function getLevelName($level)
    {
        static $levels = [
            self::LEVEL_DATA => 'data'
        ];

        return isset($levels[$level]) ? $levels[$level] : 'unknown';
    }

    public function setLevels($levels)
    {
        static $levelMap = [
            'error' => Logger::LEVEL_ERROR,
            'warning' => Logger::LEVEL_WARNING,
            'info' => Logger::LEVEL_INFO,
            'trace' => Logger::LEVEL_TRACE,
            'profile' => Logger::LEVEL_PROFILE,
            'data'  => self::LEVEL_DATA,
        ];
        if (is_array($levels)) {
            $this->_levels = 0;
            foreach ($levels as $level) {
                if (isset($levelMap[$level])) {
                    $this->_levels |= $levelMap[$level];
                } else {
                    throw new InvalidConfigException("Unrecognized level: $level");
                }
            }
        } else {
            $bitmapValues = array_reduce($levelMap, function ($carry, $item) {
                return $carry | $item;
            });
            if (!($bitmapValues & $levels) && $levels !== 0) {
                throw new InvalidConfigException("Incorrect $levels value");
            }
            \yii\web\Application::
            $this->_levels = $levels;
        }
    }

    /**
     * Processes the given log messages.
     * This method will filter the given messages with [[levels]] and [[categories]].
     * And if requested, it will also export the filtering result to specific medium (e.g. email).
     * @param array $messages log messages to be processed. See [[Logger::messages]] for the structure
     * of each message.
     * @param bool $final whether this method is called at the end of the current application
     */
    public function collect($messages, $final)
    {
        $this->messages = array_merge($this->messages, static::filterMessages($messages, $this->getLevels(), $this->categories, $this->except));
        $count = count($this->messages);
        if ($count > 0 && ($final || $this->exportInterval > 0 && $count >= $this->exportInterval)) {
            if (($context = $this->getContextMessage()) !== '') {
                $this->messages[] = [$context, Logger::LEVEL_INFO, 'application', YII_BEGIN_TIME];
            }
            // set exportInterval to 0 to avoid triggering export again while exporting
            $oldExportInterval = $this->exportInterval;
            $this->exportInterval = 0;
            $this->export();
            $this->exportInterval = $oldExportInterval;

            $this->messages = [];
        }
    }

    /**
     * @return int the message levels that this target is interested in. This is a bitmap of
     * level values. Defaults to 0, meaning  all available levels.
     */
    public function getLevels()
    {
        return $this->_levels;
    }
}