<?php

namespace App\Services;

class CsvReader
{
    private $file;
    // private array $headers;

    public array $lines = [];

    public function __construct(
        public string $filename,
    ) {
        $this->file = fopen($filename, 'r');
        if (! $this->file) {
            throw new \RuntimeException('Failed to open file: '.$filename);
        }

        // $this->headers = $this->readNextLine();
    }

    public function readNextLine(): ?array
    {
        if (($data = fgetcsv($this->file, 1000, ',')) !== false) {
            return $data;
        }

        return null; // End of file or error
    }
}