<?php

namespace App\Http\Controllers;

use App\Models\Release;
use App\Models\User;
use App\Models\UserDownload;
use App\Models\UsersRelease;
use Blacklight\NZB;
use Blacklight\utility\Utility;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\File;

class GetNzbController extends BasePageController
{
    /**
     * @throws \Exception
     */

public function getNzb(Request $request)
{
    $this->setPreferences();

    // User validation (logged in or RSS token)
    if ($request->user()) {
        $uid = $this->userdata->id;
        $maxDownloads = $this->userdata->role->downloadrequests;
        $rssToken = $this->userdata->api_token;
        if ($this->userdata->hasRole('Disabled')) {
            return Utility::showApiError(101);
        }
    } else {
        if ($request->missing('r')) {
            return Utility::showApiError(200);
        }

        $res = User::getByRssToken($request->input('r'));
        if (!$res) {
            return Utility::showApiError(100);
        }

        $uid = $res['id'];
        $rssToken = $res['api_token'];
        $maxDownloads = $res->role->downloadrequests;
        if ($res->hasRole('Disabled')) {
            return Utility::showApiError(101);
        }
    }

    // Check user download limits
    $requests = UserDownload::getDownloadRequests($uid);
    if ($requests >= $maxDownloads) {
        return Utility::showApiError(501);
    }

    // Validate release ID
    $releaseId = $request->input('id');
    if (!$releaseId) {
        return Utility::showApiError(200, 'Parameter id is required');
    }

    // Clean up the release ID (remove ".nzb" suffix)
    $releaseId = str_ireplace('.nzb', '', $releaseId);

    // Handle ZIP downloads
    if ($request->has('zip') && $request->input('zip') === '1') {
        $guids = explode(',', $releaseId);
        if ($requests + count($guids) > $maxDownloads) {
            return Utility::showApiError(501);
        }

        $zip = getStreamingZip($guids);
        if ($zip !== '') {
            User::incrementGrabs($uid, count($guids));
            foreach ($guids as $guid) {
                Release::updateGrab($guid);
                UserDownload::addDownloadRequest($uid, $guid);

                if ($request->has('del') && (int)$request->input('del') === 1) {
                    UsersRelease::delCartByUserAndRelease($guid, $uid);
                }
            }

            return $zip;
        }

        return response()->json(['message' => 'Unable to create .zip file'], 404);
    }

    // Get NZB file path
    $nzbPath = (new NZB())->getNZBPath($releaseId);
    if (!$nzbPath || !File::exists($nzbPath)) {
        return Utility::showApiError(300, 'NZB file not found!');
    }

    // Fetch release details
    $relData = Release::getByGuid($releaseId);
    if (!$relData) {
        return Utility::showApiError(300, 'Release not found!');
    }

    // Update release and user activity
    Release::updateGrab($releaseId);
    UserDownload::addDownloadRequest($uid, $relData['id']);
    User::incrementGrabs($uid);

    if ($request->has('del') && (int)$request->input('del') === 1) {
        UsersRelease::delCartByUserAndRelease($releaseId, $uid);
    }

    // Generate a clean filename
    $cleanName = str_replace([',', ' ', '/', '\\'], '_', $relData['searchname']);

    // Add metadata headers
    $headers = [
        'Content-Type' => 'application/x-nzb',
        'Expires' => date('r', now()->addDays(365)->timestamp),
        'X-DNZB-Failure' => url('/') . '/failed?guid=' . $releaseId . '&userid=' . $uid . '&api_token=' . $rssToken,
        'X-DNZB-Category' => $relData['category_name'],
        'X-DNZB-Details' => url('/') . '/details/' . $releaseId,
    ];

    if (!empty($relData['imdbid']) && $relData['imdbid'] > 0) {
        $headers['X-DNZB-MoreInfo'] = 'http://www.imdb.com/title/tt' . $relData['imdbid'];
    } elseif (!empty($relData['tvdb']) && $relData['tvdb'] > 0) {
        $headers['X-DNZB-MoreInfo'] = 'http://www.thetvdb.com/?tab=series&id=' . $relData['tvdb'];
    }

    if ((int)$relData['nfostatus'] === 1) {
        $headers['X-DNZB-NFO'] = url('/') . '/nfo/' . $releaseId;
    }

    // Stream the decompressed NZB file
    return response()->streamDownload(function () use ($nzbPath) {
        $tempFile = sys_get_temp_dir() . '/' . uniqid('nzb_', true) . '.nzb';
        $gzFile = gzopen($nzbPath, 'rb');
        if (!$gzFile) {
            throw new \Exception('Failed to open compressed NZB file: ' . $nzbPath);
        }

        $outFile = fopen($tempFile, 'wb');
        while (!gzeof($gzFile)) {
            fwrite($outFile, gzread($gzFile, 4096));
        }

        gzclose($gzFile);
        fclose($outFile);

        readfile($tempFile);
        unlink($tempFile);
    }, $cleanName . '.nzb', $headers);
   }
}