// Next.js API route support: https://nextjs.org/docs/api-routes/introduction
import type { NextApiRequest, NextApiResponse } from "next";
import { withIronSessionApiRoute } from "iron-session/next";
import { sessionOptions } from "@/lib/session";
import axios from "axios";
import client from "@/lib/mongodb";

const db = client.db(process.env.MONGODB_DB);

interface Body {
	userId: string;
	sessionId: string;
	question: string;
	answer: string;
	exerciseId: string;
	task: 1 | 2;
}

export default withIronSessionApiRoute(handler, sessionOptions);


async function handler(req: NextApiRequest, res: NextApiResponse) {
	if (!req.session.user) {
		res.status(401).json({ ok: false });
		return;
	}

	const body = req.body as Body;
	const taskNumber = body.task.toString() !== "1" && body.task.toString() !== "2" ? "1" : body.task.toString();

	// Check if there is one eval for the current exercise
	const previousEval = await db.collection("evaluation").findOne({
		user: body.userId,
		session_id: body.sessionId,
		exercise_id: body.exerciseId,
	})

	// If there is delete it
	if (previousEval) {
		await db.collection("evaluation").deleteOne({
			user: body.userId,
			session_id: body.sessionId,
			exercise_id: body.exerciseId,
		})
	}

	// Insert the new eval for the backend to place it's result
	await db.collection("evaluation").insertOne(
		{
			user: body.userId,
			session_id: body.sessionId,
			exercise_id: body.exerciseId,
			type: "writing",
			task: body.task,
			status: "pending"
		}
	);

	await axios.post(`${process.env.BACKEND_URL}/grade/writing/${taskNumber}`, body, {
		headers: {
			Authorization: `Bearer ${process.env.BACKEND_JWT}`,
		},
	});
	res.status(200).json({ ok: true });
}