import { Router, Request, Response, Application } from 'express';
import { AkairoClient } from 'discord-akairo';
import fetch from 'node-fetch';
import session from 'express-session';
import OAuth2 from '../../structures/OAuth2';
import { callbackUrl, authorization, clientID, redirectUri, clientSecret } from '../../Config';

export default class OAuth2Router {
    protected app: Application;
    protected client: AkairoClient;
    protected router: Router;
    protected oauth: OAuth2;
    
    public constructor(app: Application, client: AkairoClient, oauth: OAuth2) {
        this.app = app;
        this.client = client;
        this.router = Router();
        this.oauth = oauth;
        
        this.app.use(session({
            secret: authorization,
            resave: false,
            saveUninitialized: false,
            cookie: {
                secure: 'auto',
                sameSite: false,
                httpOnly: false,
                maxAge: 6048e5
            }
        }));
        
        this.app.use(this.router);
        
        this.router.get('/oauth/login', (req: Request, res: Response) => {
            return res.redirect(`https://discord.com/api/oauth2/authorize?client_id=${clientID}&redirect_uri=${encodeURIComponent(callbackUrl)}&response_type=code&scope=${encodeURIComponent('identify guilds')}`);
        });
        
        this.router.get('/oauth/logout', (req: Request, res: Response) => {
            req.session.destroy(null);
            return res.redirect(redirectUri);
        });
        
        this.router.get('/oauth/callback', (req: Request, res: Response) => {
            fetch('https://discord.com/api/oauth2/token', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/x-www-form-urlencoded'
                },
                //@ts-ignore
                body: new URLSearchParams({
                    'client_id': clientID,
                    'client_secret': clientSecret,
                    'grant_type': 'authorization_code',
                    'code': req.query.code,
                    'redirect_uri': callbackUrl,
                    'scope': 'identify'
                })
            })
            .then(response => response.json())
            .then(response => {
                req.session.token = response['access_token'];
                res.redirect(redirectUri);
            });
        });
        
        this.router.get('/oauth/details', async (req: Request, res: Response) => {
            const details = await this.oauth.resolveInformation(req);
            return res.status(200).send(details);
        });
    }
}