<?php

namespace App\Http\Controllers;

use GuzzleHttp\Client;
use GuzzleHttp\Exception\ClientException;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\{Cache,Log};
use Illuminate\Support\Str;

use App\Models\Site;
use App\Models\SiteVersion;
use App\Models\Version;

class VersionController extends Controller
{
	private const CACHE_TIME = 86400;						// Time to cache version

	private const GH_URL = 'https://api.github.com/repos';		// GitHub URL (rel)
	private const GH_PROJECT = 'leenooks/phpldapadmin';
	private const GH_TREE = 'master';

	private const GT_URL = 'https://gitea.dege.au/api/v1/repos';		// Gitea URL (dev)
	private const GT_PROJECT = 'deon/phpldapadmin';

	private const VERSION_REGEX = '/^v([0-9]+\.[0-9]+\.[0-9]+(\.[0-9]+)?)-([a-z]{3})-([a-z0-9]{8})$/';

	public function main(Request $request,?string $version=NULL) {
		// Our version is in the format of either:
		// v1.2.3-xxx-abcdef01
		Log::info(sprintf('Connection from [%s] reporting version [%s]',$this->getUserIpAddr(),$version));

		$matches = [];
		if (preg_match(self::VERSION_REGEX,$version,$matches)) {
			$so = Site::firstOrCreate([
				'ip_address'=>$this->getUserIpAddr()
			]);

			$vo = Version::firstOrCreate(['version'=>$version]);

			$sv = new SiteVersion;
			$sv->version_id = $vo->id;
			$so->versions()->save($sv);

			// If xxx is "dev" we are a development version
			switch($matches[3]) {
				case 'dev':
					$v = explode('.',$matches[1]);

					$current = Cache::remember('dev',self::CACHE_TIME,function() use ($v) {
						$client = new Client;
						$url = sprintf('%s/%s/commits',self::GT_URL,self::GT_PROJECT);

						try {
							$response = $client->request('GET',$url,['query'=>['sha'=>sprintf('%d.%d-dev',$v[0],$v[1]),'limit'=>1]]);
						} catch (ClientException $e) {
								return 404;
						}

						if ($response->getStatusCode() === 200) {
							$result = collect(json_decode($response->getBody()));

							return Str::limit($result[0]->sha,8,NULL);
						}

						return NULL;
					});

					if ($current) {
						if ($current === 404) {
							$response = ['action'=>'unknown','version'=>sprintf('%d.%d-dev-00000000',$v[0],$v[1])];

						} else {
							$repository = sprintf('v%s-dev-%s',$matches[1],$current);

							// Find the tag associated with version $matches[1] and see if it is more recent than $matches[4]
							$response = ($matches[4] === $current)
								? ['action'=>'current','version'=>$repository]
								: ['action'=>'upgrade','version'=>sprintf('v%s-%s-%s',$matches[1],$matches[3],$current)];
						}

					} else
						$response = ['action'=>'unable','version'=>'vn.n.n-dev-hhhhhhhh'];

					break;

				case 'rel':
					$current = Cache::remember('rel',self::CACHE_TIME,function() {
						$client = new Client;
						$url = sprintf('%s/%s/releases/latest',self::GH_URL,self::GH_PROJECT);

						// Find the tag associated with version $matches[1] and see if there is a more recent version number
						$response = $client->request('GET',$url);

						if ($response->getStatusCode() === 200) {
							$result = collect(json_decode($response->getBody()));

							return $result;
						}

						return NULL;
					});

					if ($current) {
						$repository = sprintf('v%s',$current->get('tag_name'));
						$sha = $this->get_sha($current->get('tag_name'));

						// If $matches[1] is smaller, "upgrade available"
						if ($matches[1] < $current->get('tag_name'))
							$response = ['action'=>'upgrade','version'=>$repository];

						// If $matches[1] is the same, validate that $matches[4] is current and the same and if not, error
						elseif ($matches[1] === $current->get('tag_name'))
							$response = ($matches[4] === $sha) ? ['action'=>'current','version'=>$repository] : ['action'=>'mismatch','version'=>$repository];

						// if $matches[1] is higher, abort
						else
							$response = ['action'=>'unknown','version'=>$repository];

					} else
						$response = ['action'=>'unable','version'=>'vn.n.n-rel-hhhhhhhh'];

					break;
			}

			$sv->response = $response;
			$sv->save();

			return $response;
		}

		// Return the current version
		return ['action'=>'invalid','version'=>'vn.n.n-xxxx-hhhhhhhh'];
	}

	private function get_sha(string $tag): ?string
	{
		return Cache::remember($tag,self::CACHE_TIME,function() use ($tag){
			$url = sprintf('%s/%s/git/ref/tags/%s',self::GH_URL,self::GH_PROJECT,$tag);

			// Find the tag associated with version $matches[1] and see if there is a more recent version number
			$client = new Client;
			$response = $client->request('GET',$url);

			if ($response->getStatusCode() === 200) {
				$result = collect(json_decode($response->getBody()));

				return substr($result->get('object')->sha,0,8);
			}

			return NULL;
		});
	}

	public function getUserIpAddr(): string
	{
		if (isset($_SERVER['HTTP_CLIENT_IP']))
			$ipaddress = $_SERVER['HTTP_CLIENT_IP'];
		else if(isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
			$ips = preg_split('/,\s*/',$_SERVER['HTTP_X_FORWARDED_FOR']);
			$ipaddress = $ips[0];
		}
		else if(isset($_SERVER['HTTP_X_FORWARDED']))
			$ipaddress = $_SERVER['HTTP_X_FORWARDED'];
		else if(isset($_SERVER['HTTP_FORWARDED_FOR']))
			$ipaddress = $_SERVER['HTTP_FORWARDED_FOR'];
		else if(isset($_SERVER['HTTP_FORWARDED']))
			$ipaddress = $_SERVER['HTTP_FORWARDED'];
		else if(isset($_SERVER['REMOTE_ADDR']))
			$ipaddress = $_SERVER['REMOTE_ADDR'];
		else
			$ipaddress = 'UNKNOWN';

		return $ipaddress;
	}
}