<?php

/**
 * TfLogger class file.
 * 
 * @copyright   Simon Wilkinson 2013+ (https://tuskfish.biz)
 * @license     https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html GNU General Public License (GPL) V2
 * @author      Simon Wilkinson <simon@isengard.biz>
 * @version     Release: 1.0
 * @since       1.0
 * @package     core
 */

// Enable strict type declaration.
declare(strict_types=1);

if (!defined("TFISH_ROOT_PATH")) die("TFISH_ERROR_ROOT_PATH_NOT_DEFINED");

/**
 * Provides a custom error handler which writes to a logfile.
 * 
 * Custom error handler functions such as this one should return FALSE; otherwise calls to 
 * trigger_error($msg, E_USER_ERROR) will not cause a script to stop execution!
 *
 * @copyright   Simon Wilkinson 2013+ (https://tuskfish.biz)
 * @license     https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html GNU General Public License (GPL) V2
 * @author      Simon Wilkinson <simon@isengard.biz>
 * @version     Release: 1.0
 * @since       1.0
 * @package     core
 * @var         TfValidator $validator Instance of the Tuskfish data validator class.
 */
class TfLogger
{
    
    protected $validator;
    
    /**
     * Constructor.
     * 
     * @param TfValidator $validator An instance of the Tuskfish data validator class.
     */
    public function __construct(TfValidator $validator)
    {
        if (is_a($validator, 'TfValidator')) {
            $this->validator = $validator; 
        } else {
            trigger_error(TFISH_ERROR_NOT_VALIDATOR, E_USER_ERROR);
        }
    }

    /**
     * Tuskfish custom error logger class.
     * 
     * Errors are logged to TFISH_ERROR_LOG_PATH (default is /trust_path/log/tuskfish_log.txt). For
     * debugging purpose you can reverse the comment status of the last two lines to display errors
     * on screen. Be aware, however, that this will prevent script execution from halting when an
     * error is triggered, which has security implications. You must therefore CLOSE your site via
     * the admin preferences before doing this. Comment the lines back out before re-opening your
     * site.
     * 
     * @param int $errno The level of the error raised.
     * @param string $error The error message.
     * @param string $file Name of the file where the error occurred.
     * @param int $line Line number the error was raised at.
     * @return bool Returns false to halt script execution.
     */
    public function logError(int $errno = null, string $error = '',
            string $file = '', int $line = null)
    {
        $errno = isset($errno) ? $this->validator->trimString($errno) : TFISH_ERROR_UNSPECIFIED;
        $error = !empty($error) ? $this->validator->trimString($error) : TFISH_ERROR_UNSPECIFIED;
        $file = !empty($file) ? $this->validator->trimString($file) : TFISH_ERROR_UNSPECIFIED;
        $line = isset($line) ? $this->validator->trimString($line) : TFISH_ERROR_UNSPECIFIED;
        
        $message = date("Y-m-d, H:i:s", time()) . ": [ERROR][$errno][$error]";
        $message .= "[$file:$line]\r\n";
        error_log($message, 3, TFISH_ERROR_LOG_PATH);

        // Debug only - comment OUT in production site to display errors on screen.
        // echo '<p>' . print($message) . '</p>';
        
        // Debug only - UNCOMMENT in production site.
        return false;
    }

}
