<?php

namespace NoccyLabs\Dataset;

use NoccyLabs\Dataset\Readers\CsvReader;
use NoccyLabs\Dataset\Readers\JsonReader;

class Dataset
{
    protected string $identifier;
    
    protected array $options;

    protected ?string $version;

    public function __construct(string $identifier, array $options, ?string $version=null)
    {
        $this->identifier = $identifier;
        $this->options = $options;
        $this->version = $version;
    }

    public function getIdentifier(): string
    {
        return $this->identifier;
    }

    public function getVersion(): ?string
    {
        return $this->version;
    }

    public function open(): ReaderInterface
    {
        $filename = $this->options['filename'];
        $reader = $this->determineReaderForFile($filename);
        $inst = new $reader($filename, $this->options);
        return $inst;
    }

    private function determineReaderForFile(string $filename): string
    {
        if ($reader = $this->options['reader']??null) {
            return $reader;
        }
        $ext = pathinfo($filename, PATHINFO_EXTENSION);
        return match ($ext) {
            'json' => JsonReader::class,
            'csv' => CsvReader::class,
            default => throw new \RuntimeException("Unable to determine reader for dataset file")
        };
    }
    
}