import { IS_PROD } from "@stealth-developers/config";
import db, { sessions, upsertUser } from "@stealth-developers/db";
import {
	RESTGetAPICurrentUserResult,
	RESTPostOAuth2AccessTokenResult,
	RouteBases,
	Routes,
} from "discord.js";
import Elysia, { t } from "elysia";

import { OAuth2ErrorResponse, isError, isOAuth2Error, makeRequest } from "../discord";
import { CLIENT_ID, CLIENT_SECRET, FRONTEND_URL, REDIRECT_URI } from "../lib/constants";

export const authRoutes = new Elysia().group("/auth", (app) =>
	app
		.get(
			"/login",
			({ redirect }) => {
				const redirectUri = `https://discord.com/oauth2/authorize?client_id=${CLIENT_ID}&response_type=code&redirect_uri=${encodeURIComponent(REDIRECT_URI)}&scope=identify+guilds`;
				return redirect(redirectUri, 302);
			},
			{
				tags: ["auth"],
			},
		)
		.get(
			"/callback",
			async ({ query: { code }, cookie: { session_id }, redirect }) => {
				const params = new URLSearchParams({
					code,
					client_id: CLIENT_ID,
					client_secret: CLIENT_SECRET,
					grant_type: "authorization_code",
					redirect_uri: REDIRECT_URI,
				});

				const tokenResponse = await fetch("https://discord.com/api/oauth2/token", {
					method: "POST",
					body: params,
					headers: { "Content-Type": "application/x-www-form-urlencoded" },
				});
				const tokenData = (await tokenResponse.json()) as
					| OAuth2ErrorResponse
					| RESTPostOAuth2AccessTokenResult;
				if (isOAuth2Error(tokenData))
					throw new Error(tokenData.error_description ?? tokenData.error);

				const userData = await makeRequest<RESTGetAPICurrentUserResult>(
					`${RouteBases.api}${Routes.user()}`,
					tokenData.access_token,
				);
				if (isError(userData)) throw new Error(userData.message);

				const upsertedUser = await upsertUser({
					avatar: userData.avatar,
					username: userData.username,
					displayName: userData.global_name,
					id: userData.id,
				});

				const sessionId = crypto.randomUUID();
				const expiresAt = new Date().getTime() + tokenData.expires_in * 1_000;

				await db.insert(sessions).values({
					id: sessionId,
					userId: upsertedUser.id,

					accessToken: tokenData.access_token,
					refreshToken: tokenData.refresh_token,
					scope: tokenData.scope,
					tokenType: tokenData.token_type,

					createdAt: new Date(),
					expiresAt: new Date(expiresAt),
				});

				session_id.set({
					value: sessionId,
					httpOnly: true,
					path: "/",
					secure: IS_PROD,
					sameSite: "lax",
					expires: new Date(expiresAt),
				});

				return redirect(FRONTEND_URL);
			},
			{
				tags: ["auth"],
				query: t.Object({
					code: t.String(),
				}),
			},
		),
);