<?php

namespace App\Http\Controllers;

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

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

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

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

	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 = new SiteVersion;
			$vo->version = $version;
			$so->versions()->save($vo);

			// If xxx is "dev" we are a development version
			switch($matches[3]) {
				case 'dev':
					$current = Cache::remember('dev',self::CACHE_TIME,function() {
						$client = new Client;
						$url = sprintf('%s/%s/commits/%s',self::GH_URL,self::GH_PROJECT,self::GH_TREE);

						$response = $client->request('GET',$url,['form_params'=>['per_page'=>'1']]);

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

							return Str::limit($result->get('sha'),8,NULL);
						}

						return NULL;
					});

					if ($current) {
						$repository = sprintf('v%s-rel-%s',$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/tags',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,['form_params'=>['ref_name'=>'master','sort'=>'desc']]);

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

							return $result->first();
						}

						return NULL;
					});

					if ($current) {
						$sha = Str::limit($current->commit->sha,8,NULL);
						$repository = sprintf('v%s-rel-%s',$current->name,$sha);

						// If $matches[1] is smaller, "upgrade available"
						if ($matches[1] < $current->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->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;
			}

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

			return $response;
		}

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

	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;
	}
}