<?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 LogIterator implements \Iterator
{
    private ?string $lastLog = null;

    private string $filename;

    private array $log = [];

    private ?int $index = null;

    private ?int $lindex = null;

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

    private function readLog(string $filename)
    {
        if (!file_exists($filename)) {
            $this->lastLog = null;
            $this->log = [];
            $this->index = null;
            $this->lindex = null;
            return;
        }
        $log = json_decode(file_get_contents($filename), true);
        $this->lastLog = $log['lastlog']??null;
        $this->log = $log['events'];
        $this->lindex = 0;
        if ($this->index === null) {
            $this->index = 0;
        }
    }

    public function rewind(): void
    {
        $this->index = null;
        $this->readLog($this->filename);
    }

    public function current()
    {
        return $this->log[$this->lindex];
    }

    public function key()
    {
        return $this->index;
    }

    public function next(): void
    {
        $this->index++;
        $this->lindex++;
        if ($this->lindex >= count($this->log)) {
            if ($this->lastLog) {
                $this->readLog($this->lastLog);
            } else {
                $this->lindex = null;
            }
        }
    }

    public function valid(): bool
    {
        return $this->lindex !== null;
    }
}