<?php

use Utopia\App;
use Utopia\Exception;
use Appwrite\Storage\Device\Local;
use Appwrite\Storage\Storage;
use Appwrite\ClamAV\Network;

App::get('/v1/health')
    ->desc('Get HTTP')
    ->groups(['api', 'health'])
    ->label('scope', 'health.read')
    ->label('sdk.platform', [APP_PLATFORM_SERVER])
    ->label('sdk.namespace', 'health')
    ->label('sdk.method', 'get')
    ->label('sdk.description', '/docs/references/health/get.md')
    ->action(function ($response) {
        /** @var Utopia\Response $response */

        $response->json(['status' => 'OK']);
    }, ['response']);

App::get('/v1/health/version')
    ->desc('Get Version')
    ->groups(['api', 'health'])
    ->label('scope', 'public')
    ->action(function ($response) {
        /** @var Utopia\Response $response */

        $response->json(['version' => APP_VERSION_STABLE]);
    }, ['response']);

App::get('/v1/health/db')
    ->desc('Get DB')
    ->groups(['api', 'health'])
    ->label('scope', 'health.read')
    ->label('sdk.platform', [APP_PLATFORM_SERVER])
    ->label('sdk.namespace', 'health')
    ->label('sdk.method', 'getDB')
    ->label('sdk.description', '/docs/references/health/get-db.md')
    ->action(function ($response, $register) {
        /** @var Utopia\Response $response */
        /** @var Utopia\Registry\Registry $register */

        $register->get('db'); /* @var $db PDO */

        $response->json(['status' => 'OK']);
    }, ['response', 'register']);

App::get('/v1/health/cache')
    ->desc('Get Cache')
    ->groups(['api', 'health'])
    ->label('scope', 'health.read')
    ->label('sdk.platform', [APP_PLATFORM_SERVER])
    ->label('sdk.namespace', 'health')
    ->label('sdk.method', 'getCache')
    ->label('sdk.description', '/docs/references/health/get-cache.md')
    ->action(function ($response, $register) {
        /** @var Utopia\Response $response */
        /** @var Utopia\Registry\Registry $register */
        $register->get('cache'); /* @var $cache Predis\Client */

        $response->json(['status' => 'OK']);
    }, ['response']);

App::get('/v1/health/time')
    ->desc('Get Time')
    ->groups(['api', 'health'])
    ->label('scope', 'health.read')
    ->label('sdk.platform', [APP_PLATFORM_SERVER])
    ->label('sdk.namespace', 'health')
    ->label('sdk.method', 'getTime')
    ->label('sdk.description', '/docs/references/health/get-time.md')
    ->action(function ($response) {
        /** @var Utopia\Response $response */

        /*
         * Code from: @see https://www.beliefmedia.com.au/query-ntp-time-server
         */
        $host = 'time.google.com'; // https://developers.google.com/time/
        $gap = 60; // Allow [X] seconds gap

        /* Create a socket and connect to NTP server */
        $sock = \socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);

        \socket_connect($sock, $host, 123);

        /* Send request */
        $msg = "\010".\str_repeat("\0", 47);

        \socket_send($sock, $msg, \strlen($msg), 0);

        /* Receive response and close socket */
        \socket_recv($sock, $recv, 48, MSG_WAITALL);
        \socket_close($sock);

        /* Interpret response */
        $data = \unpack('N12', $recv);
        $timestamp = \sprintf('%u', $data[9]);

        /* NTP is number of seconds since 0000 UT on 1 January 1900
            Unix time is seconds since 0000 UT on 1 January 1970 */
        $timestamp -= 2208988800;

        $diff = ($timestamp - \time());

        if ($diff > $gap || $diff < ($gap * -1)) {
            throw new Exception('Server time gaps detected');
        }

        $response->json(['remote' => $timestamp, 'local' => \time(), 'diff' => $diff]);
    }, ['response']);

App::get('/v1/health/queue/webhooks')
    ->desc('Get Webhooks Queue')
    ->groups(['api', 'health'])
    ->label('scope', 'health.read')
    ->label('sdk.platform', [APP_PLATFORM_SERVER])
    ->label('sdk.namespace', 'health')
    ->label('sdk.method', 'getQueueWebhooks')
    ->label('sdk.description', '/docs/references/health/get-queue-webhooks.md')
    ->action(function ($response) {
        /** @var Utopia\Response $response */

        $response->json(['size' => Resque::size('v1-webhooks')]);
    }, ['response']);

App::get('/v1/health/queue/tasks')
    ->desc('Get Tasks Queue')
    ->groups(['api', 'health'])
    ->label('scope', 'health.read')
    ->label('sdk.platform', [APP_PLATFORM_SERVER])
    ->label('sdk.namespace', 'health')
    ->label('sdk.method', 'getQueueTasks')
    ->label('sdk.description', '/docs/references/health/get-queue-tasks.md')
    ->action(function ($response) {
        /** @var Utopia\Response $response */

        $response->json(['size' => Resque::size('v1-tasks')]);
    }, ['response']);

App::get('/v1/health/queue/logs')
    ->desc('Get Logs Queue')
    ->groups(['api', 'health'])
    ->label('scope', 'health.read')
    ->label('sdk.platform', [APP_PLATFORM_SERVER])
    ->label('sdk.namespace', 'health')
    ->label('sdk.method', 'getQueueLogs')
    ->label('sdk.description', '/docs/references/health/get-queue-logs.md')
    ->action(function ($response) {
        /** @var Utopia\Response $response */

        $response->json(['size' => Resque::size('v1-audit')]);
    }, ['response']);

App::get('/v1/health/queue/usage')
    ->desc('Get Usage Queue')
    ->groups(['api', 'health'])
    ->label('scope', 'health.read')
    ->label('sdk.platform', [APP_PLATFORM_SERVER])
    ->label('sdk.namespace', 'health')
    ->label('sdk.method', 'getQueueUsage')
    ->label('sdk.description', '/docs/references/health/get-queue-usage.md')
    ->action(function ($response) {
        /** @var Utopia\Response $response */

        $response->json(['size' => Resque::size('v1-usage')]);
    }, ['response']);

App::get('/v1/health/queue/certificates')
    ->desc('Get Certificate Queue')
    ->groups(['api', 'health'])
    ->label('scope', 'health.read')
    ->label('sdk.platform', [APP_PLATFORM_SERVER])
    ->label('sdk.namespace', 'health')
    ->label('sdk.method', 'getQueueCertificates')
    ->label('sdk.description', '/docs/references/health/get-queue-certificates.md')
    ->action(function ($response) {
        /** @var Utopia\Response $response */

        $response->json(['size' => Resque::size('v1-certificates')]);
    }, ['response']);

App::get('/v1/health/queue/functions')
    ->desc('Get Functions Queue')
    ->groups(['api', 'health'])
    ->label('scope', 'health.read')
    ->label('sdk.platform', [APP_PLATFORM_SERVER])
    ->label('sdk.namespace', 'health')
    ->label('sdk.method', 'getQueueFunctions')
    ->label('sdk.description', '/docs/references/health/get-queue-functions.md')
    ->action(function ($response) {
        /** @var Utopia\Response $response */

        $response->json(['size' => Resque::size('v1-functions')]);
    }, ['response']);

App::get('/v1/health/storage/local')
    ->desc('Get Local Storage')
    ->groups(['api', 'health'])
    ->label('scope', 'health.read')
    ->label('sdk.platform', [APP_PLATFORM_SERVER])
    ->label('sdk.namespace', 'health')
    ->label('sdk.method', 'getStorageLocal')
    ->label('sdk.description', '/docs/references/health/get-storage-local.md')
    ->action(function ($response) {
        /** @var Utopia\Response $response */

        foreach ([
            'Uploads' => APP_STORAGE_UPLOADS,
            'Cache' => APP_STORAGE_CACHE,
            'Config' => APP_STORAGE_CONFIG,
            'Certs' => APP_STORAGE_CERTIFICATES
        ] as $key => $volume) {
            $device = new Local($volume);

            if (!\is_readable($device->getRoot())) {
                throw new Exception('Device '.$key.' dir is not readable');
            }

            if (!\is_writable($device->getRoot())) {
                throw new Exception('Device '.$key.' dir is not writable');
            }
        }

        $response->json(['status' => 'OK']);
    }, ['response']);

App::get('/v1/health/anti-virus')
    ->desc('Get Anti virus')
    ->groups(['api', 'health'])
    ->label('scope', 'health.read')
    ->label('sdk.platform', [APP_PLATFORM_SERVER])
    ->label('sdk.namespace', 'health')
    ->label('sdk.method', 'getAntiVirus')
    ->label('sdk.description', '/docs/references/health/get-storage-anti-virus.md')
    ->action(function ($response) {
        /** @var Utopia\Response $response */

        if (App::getEnv('_APP_STORAGE_ANTIVIRUS') === 'disabled') { // Check if scans are enabled
            throw new Exception('Anitvirus is disabled');
        }

        $antiVirus = new Network('clamav', 3310);

        $response->json([
            'status' => (@$antiVirus->ping()) ? 'online' : 'offline',
            'version' => @$antiVirus->version(),
        ]);
    }, ['response']);

App::get('/v1/health/stats') // Currently only used internally
    ->desc('Get System Stats')
    ->groups(['api', 'health'])
    ->label('scope', 'god')
    // ->label('sdk.platform', [APP_PLATFORM_SERVER])
    // ->label('sdk.namespace', 'health')
    // ->label('sdk.method', 'getStats')
    ->label('docs', false)
    ->action(function ($response, $register) {
        /** @var Utopia\Response $response */
        /** @var Utopia\Registry\Registry $register */

        $device = Storage::getDevice('local');
        $cache = $register->get('cache');

        $cacheStats = $cache->info();

        $response
            ->json([
                'server' => [
                    'name' => 'nginx',
                    'version' => \shell_exec('nginx -v 2>&1'),
                ],
                'storage' => [
                    'used' => Storage::human($device->getDirectorySize($device->getRoot().'/')),
                    'partitionTotal' => Storage::human($device->getPartitionTotalSpace()),
                    'partitionFree' => Storage::human($device->getPartitionFreeSpace()),
                ],
                'cache' => [
                    'uptime' => (isset($cacheStats['uptime_in_seconds'])) ? $cacheStats['uptime_in_seconds'] : 0,
                    'clients' => (isset($cacheStats['connected_clients'])) ? $cacheStats['connected_clients'] : 0,
                    'hits' => (isset($cacheStats['keyspace_hits'])) ? $cacheStats['keyspace_hits'] : 0,
                    'misses' => (isset($cacheStats['keyspace_misses'])) ? $cacheStats['keyspace_misses'] : 0,
                    'memory_used' => (isset($cacheStats['used_memory'])) ? $cacheStats['used_memory'] : 0,
                    'memory_used_human' => (isset($cacheStats['used_memory_human'])) ? $cacheStats['used_memory_human'] : 0,
                    'memory_used_peak' => (isset($cacheStats['used_memory_peak'])) ? $cacheStats['used_memory_peak'] : 0,
                    'memory_used_peak_human' => (isset($cacheStats['used_memory_peak_human'])) ? $cacheStats['used_memory_peak_human'] : 0,
                ],
            ]);
    }, ['response', 'register']);