<?php

namespace Nwb\MultiDownloaderClient;

class MultiDownloaderClient
{
    private string $apiUrl = 'https://multi-dl.kub.nwb.fr';
    private string $apiKey;

    private array $files = [];

    public function __construct(array $options = [])
    {
        $apiKey = $options['apiKey'] ?? getenv('MULTI_DOWNLOADER_API_KEY');

        if (!$apiKey) {
            throw new \InvalidArgumentException('API key is required');
        }

        $this->apiKey = $apiKey;

        if (!empty($options['apiUrl'])) {
            $this->apiUrl = $options['apiUrl'];
        }
    }

    public function setFiles(array $files)
    {
        $this->files = [];
        $this->addFiles($files);

        return $this;
    }

    public function addFile(FileRequest $file)
    {
        $this->files[] = $file;

        return $this;
    }

    public function addFiles(array $files)
    {
        foreach ($files as $file) {
            $this->addFile($file);
        }

        return $this;
    }

    private function buildRequest(): array
    {
        return array_map(function (FileRequest $file) {
            return $file->toArray();
        }, $this->files);
    }

    public function downloadAsString(): string
    {
        return $this->sendRequest();
    }

    public function downloadTo(string $path): string
    {
        $response = $this->sendRequest([
            CURLOPT_RETURNTRANSFER => false,
            CURLOPT_FILE => fopen($path, 'w'),
        ]);

        return $response;
    }

    public function htmlForm(): string
    {
        ob_start();
        include __DIR__ . '/htmlForm.php';
        return ob_get_clean();
    }

    private function sendRequest(array $options = []): string
    {
        $ch = curl_init();

        $options = array_replace($options, [
            CURLOPT_URL => $this->apiUrl . '/v2/zip',
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_POST => true,
            CURLOPT_POSTFIELDS => json_encode($this->buildRequest()),
            CURLOPT_HTTPHEADER => [
                'Content-Type: application/json',
                'Authorization: Bearer ' . $this->apiKey,
            ],
        ]);

        curl_setopt_array($ch, $options);

        $response = curl_exec($ch);

        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

        if ($httpCode !== 200) {
            throw new MultiDownloaderException('Error while requesting API: ' . $response);
        }

        curl_close($ch);

        return $response;
    }
}