import * as Wreck from 'wreck';
import * as qs from 'querystring';

import { Provider, Scopes } from '../provider';

export class PatreonProvider extends Provider {
    public name = 'patreon';
    public tokenUrl = 'https://api.patreon.com/oauth2/token';
    public authUrl = 'https://www.patreon.com/oauth2/authorize';

    constructor(
        public clientId: string,
        public clientSecret: string,
        public scopes: Scopes = [],
    ) {
        super();
    }

    requestToken(code: string, redirect_uri: string) {
        return new Promise((resolve, reject) => {
            const query = {
                code,
                redirect_uri,
                client_id: this.clientId,
                client_secret: this.clientSecret,
                grant_type: 'authorization_code',
            };
            Wreck.post(
                `${this.tokenUrl}?${qs.stringify(query)}`,
                {
                    json: true,
                },
                (err, message, res) => {
                    if (err) {
                        reject(err);
                        return;
                    }

                    if (res.error) {
                        const error = new Error(res.error_description);
                        error.name = err.error;
                        reject(error);
                        return;
                    }

                    resolve(res);
                },
            );
        });
    }
}