<?PHP
/**
 * This file offers a class for handling outputs and logging.
 *
 * @author Joshua Ramon Enslin <joshua@museum-digital.de>
 */

/**
 * Class for handling outputs and logs for museum-digital's background tools.
 */
class MDOutputHandler {

    /*
     * Variables
     */

    /** @var integer */
    private $_verbosity;
    /** @var string */
    private $_context;
    /** @var string */
    private $_logfile;
    /** @var integer */
    private $_counter;
    /** @var boolean */
    private $_file_logging;
    /** @var float */
    private $_startTime;

    /**
     * Function human_filesize translates byte-level filesizes to human readable ones.
     * Thanks to Jeffrey Sambells http://jeffreysambells.com/2012/10/25/human-readable-filesize-php
     *
     * @param integer $bytes    A file size, e.g. returned from filesize().
     * @param integer $decimals Number of decimal digits to allow.
     *
     * @return string
     */
    final private function _human_filesize(int $bytes, int $decimals = 2):string {

        $size = ['B','kB','MB','GB','TB','PB','EB','ZB','YB'];
        $factor = floor((strlen((string)$bytes) - 1) / 3);
        return sprintf("%.{$decimals}f", $bytes / pow(1024, $factor)) . $size[$factor];

    }

    /**
     * Setter function for the verbosity option.
     *
     * @param integer $input New value of boolean value verbosity.
     *
     * @return void
     */
    final public function setVerbosity(int $input = 0):void {

        $this->_verbosity = $input;

    }

    /**
     * Setter function for the additional context description.
     *
     * @param string $input New value.
     *
     * @return void
     */
    final public function setContext(string $input = ""):void {

        $this->_context = $input;

    }

    /**
     * Setter function for file logging.
     *
     * @param boolean $input New value.
     *
     * @return void
     */
    final public function setFileLogging(bool $input = false):void {

        $this->_file_logging = $input;

        if ($this->_file_logging === true) {
            if (!is_dir(__DIR__ . "/../logs")) mkdir(__DIR__ . "/../logs", 0755);
            touch($this->_logfile);
        }

    }

    /**
     * Main function of this class.
     * Formats a message uniformly and writes it to the log, maybe also to stdout.
     *
     * @param string  $msg        Message to log.
     * @param integer $statusCode Status code.
     *                            0: Note
     *                            1: Skipped
     *                            2: Update
     *                            3: Error.
     *
     * @return void
     */
    final public function toLog(string $msg, int $statusCode = 0):void {

        // Get parts for generating the message to log.
        $this->_counter++;              // Increment counter
        $date = date("Y-m-d H:i:s");    // Get current date & time.

        switch ($statusCode) {
        case MDConsole::STATUS_SKIPPED:
            $statusSymbol = "-";
            break;
        case MDConsole::STATUS_UPDATE:
            $statusSymbol = "U";
            break;
        case MDConsole::STATUS_ERROR:
            $statusSymbol = "E";
            break;
        case MDConsole::STATUS_DELETION:
            $statusSymbol = "D";
            break;
        case MDConsole::STATUS_NOTICE:
        default:
            $statusSymbol = "N";
            break;
        }

        if (!empty($this->_context)) $contextStr = "{$this->_context} │ ";
        else $contextStr = "";

        // Generate the message to log.
        $message = "$statusSymbol │ {$contextStr}#" . sprintf("%1$07s", $this->_counter) . " │ " . sprintf("%1$7s", $this->_human_filesize(memory_get_usage())) . " │ {$date} │ {$msg}" . PHP_EOL;

        if ($this->_file_logging === true) {
            file_put_contents($this->_logfile, $message, FILE_APPEND);
        }

        if (($this->_verbosity > 0 && in_array($statusCode, [MDConsole::STATUS_UPDATE, MDConsole::STATUS_DELETION, MDConsole::STATUS_ERROR])) || $this->_verbosity === 2) echo $message;

        if ($this->_counter % 250 === 0) {
            echo '―――> ' . sprintf("%1$07d", $this->_counter) . " operations processed" . PHP_EOL;
            echo str_replace("_", "―", sprintf("%'_80s", "_")) . PHP_EOL;
        }

    }

    /**
     * Constructor function that sets defaults and ensures the logfile exists.
     */
    public function __construct() {

        $this->_startTime = microtime(true);
        $this->_counter   = 0;
        $this->setVerbosity();
        $this->setContext();
        $this->setFileLogging();
        $this->_logfile   = __DIR__ . "/../logs/" . date("Ymd_His") . ".txt";

        // Ensure the log directory exists

        $this->toLog("Activated logger.");

    }

    /**
     * Destructor.
     *
     * @return void
     */
    function __destruct() {
        $endtime = microtime(true);
        $this->toLog("Finished operation. Processing duration: " . strval($endtime - $this->_startTime));

    }

}