<?php
require_once(CRAYON_ROOT_PATH . 'crayon_settings.class.php');

/* Manages logging variable values to the log file. */

class CrayonLog
{
    private static $file = NULL;

    // Logs a variable value to a log file

    public static function log($var = NULL, $title = '', $trim_url = TRUE)
    {
        if ($var === NULL) {
            // Return log

            if (($log = CrayonUtil::file(CRAYON_LOG_FILE)) !== FALSE) {
                return $log;
            } else {
                return '';
            }
        } else {
            try {
                if (self::$file == NULL) {
                    self::$file = @fopen(CRAYON_LOG_FILE, 'a+');

                    if (self::$file) {
                        $header = /*CRAYON_DASH .*/
                            CRAYON_NL . '[Crayon Syntax Highlighter Log Entry - ' . date('g:i:s A - d M Y') . ']' . CRAYON_NL .
                            /*CRAYON_DASH .*/
                            CRAYON_NL;
                        fwrite(self::$file, $header);
                    } else {
                        return;
                    }
                }
                // Capture variable dump
                $buffer = trim(strip_tags(var_export($var, true)));
                $title = (!empty($title) ? " [$title]" : '');

                // Remove absolute path to plugin directory from buffer
                if ($trim_url) {
                    $buffer = CrayonUtil::path_rel($buffer);
                }
                $write = $title . ' ' . $buffer . CRAYON_NL /* . CRAYON_LINE . CRAYON_NL*/
                ;

                // If we exceed max file size, truncate file first
                if (filesize(CRAYON_LOG_FILE) + strlen($write) > CRAYON_LOG_MAX_SIZE) {
                    ftruncate(self::$file, 0);
                    fwrite(self::$file, 'The log has been truncated since it exceeded ' . CRAYON_LOG_MAX_SIZE .
                        ' bytes.' . CRAYON_NL . /*CRAYON_LINE .*/ CRAYON_NL);
                }
                clearstatcache();
                fwrite(self::$file, $write, CRAYON_LOG_MAX_SIZE);
            } catch (Exception $e) {
                // Ignore fatal errors during logging
            }
        }
    }

    // Logs system-wide only if global settings permit

    public static function syslog($var = NULL, $title = '', $trim_url = TRUE)
    {
        if (CrayonGlobalSettings::val(CrayonSettings::ERROR_LOG_SYS)) {
            $title = (empty($title)) ? 'SYSTEM LOG' : $title;
            self::log($var, $title, $trim_url);
        }
    }

    public static function debug($var = NULL, $title = '', $trim_url = TRUE)
    {
        if (CRAYON_DEBUG) {
            $title = (empty($title)) ? 'DEBUG' : $title;
            self::log($var, $title, $trim_url);
        }
    }

    public static function clear()
    {
        if (!@unlink(CRAYON_LOG_FILE)) {
            // Will result in nothing if we can't log

            self::log('The log could not be cleared', 'Log Clear');
        }
        self::$file = NULL; // Remove file handle

    }

    public static function email($to, $from = NULL)
    {
        if (($log_contents = CrayonUtil::file(CRAYON_LOG_FILE)) !== FALSE) {
            $headers = $from ? 'From: ' . $from : '';
            $result = @mail($to, 'Crayon Syntax Highlighter Log', $log_contents, $headers);
            self::log('The log was emailed to the admin.', 'Log Email');
        } else {
            // Will result in nothing if we can't email

            self::log("The log could not be emailed to $to.", 'Log Email');
        }
    }
}