<?php

namespace SparkPlug\Com\Noccy\ApiClient\Log;

use JsonSerializable;
use Psr\Http\Message\ResponseInterface;
use SparkPlug\Com\Noccy\ApiClient\Log\RequestData as LogRequestData;
use SparkPlug\Com\Noccy\ApiClient\Request\Request;


class RequestLog
{
    private ?string $lastLog = null;

    private string $filename;

    private array $append = [];

    const MAX_EVENTS_PER_FILE = 100;

    public function __construct(string $logfile)
    {
        $this->filename = $logfile;
    }

    public function append(RequestData $request)
    {
        $this->append[] = $request;
    }

    public function flush()
    {
        if (file_exists($this->filename)) {
            $log = json_decode(file_get_contents($this->filename), true);
        } else {
            $log = [
                'lastlog' => null,
                'events' => []
            ];
        }
        while (count($this->append) > 0) {
            $append = array_shift($this->append);
            array_push($log['events'], $append);
            $json = json_encode($log, JSON_PRETTY_PRINT|JSON_UNESCAPED_SLASHES);
            if (count($log['events']) >= self::MAX_EVENTS_PER_FILE) {
                do {
                    $newlog = sprintf("%s.%04x", $this->filename, rand(0,65535));
                } while (file_exists($newlog));
                file_put_contents($newlog, $json);
                $log['lastlog'] = basename($newlog);
                $log['events'] = [];
            } else {
                file_put_contents($this->filename."~", $json);
                if (filesize($this->filename."~") > 0) {
                    rename($this->filename."~", $this->filename);
                } else {
                    fprintf(STDERR, "error: Null size log writing requestlog %s\n", $this->filename);
                }
            }
        }
    }

}