<?php

namespace App\Helpers;

use Exception;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;
use Psr\Log\LoggerInterface;

class CalendlyHelper
{

    const METHOD_GET = 'GET';
    const METHOD_POST = 'POST';

    private static array $allowedMethods = [
        self::METHOD_GET,
        self::METHOD_POST,
    ];

    private string $url;
    private string $token;

    private LoggerInterface $logger;

    const LOG_CHANNEL = 'calendly';

    const SCOPE_USER = 'user';
    const SCOPE_ORGANIZATION = 'organization';

    const EVENT_CREATED = 'invitee.created';
    const EVENT_CANCELED = 'invitee.canceled';
    const EVENT_INVITEE_NO_SHOW_CREATED = 'invitee_no_show.created';
    const EVENT_ROUTING_FORM_SUBMISSION_CREATED = 'routing_form_submission.created';

    public function __construct()
    {
        $this->url = env('CALENDLY_URL');
        $this->token = env('CALENDLY_TOKEN');

        $this->logger = Log::channel(self::LOG_CHANNEL);
    }

    public function check(): bool
    {
        return !empty($this->url) && !empty($this->token);
    }

    private function request(string $method, string $apiMethod, array $data = [])
    {
        if (empty($method) || !in_array($method, self::$allowedMethods)) {
            throw new Exception('Undefined request method');
        }

        $http = Http::withToken($this->token);
        $this->logger->info($apiMethod . ' request', $data);
        $url = $this->url . $apiMethod;
        switch ($method) {
            case self::METHOD_GET:
                $response = $http->get($url);
                break;
            case self::METHOD_POST:
                $response = $http->post($url, $data);
                break;
        }

        $response = $response->json();
        $this->logger->info($apiMethod . ' response', $response);

        return $response;
    }

    private function get(string $apiMethod)
    {
        return $this->request(self::METHOD_GET, $apiMethod);
    }

    private function post(string $apiMethod, array $data = [])
    {
        return $this->request(self::METHOD_POST, $apiMethod, $data);
    }

    public function me()
    {
        return $this->get('/users/me');
    }

    public function createWebhookSubscriptions(string $organizationId, string $url)
    {
        $data = [
            'url' => $url,
            'events' => [self::EVENT_CREATED],
            'organization' => $this->url . '/organizations/' . $organizationId,
            'scope' => self::SCOPE_ORGANIZATION,
        ];

        return $this->post('/webhook_subscriptions', $data);
    }

}