import con from '../db/db.js';
import { Router } from "express";
import { getAdminID } from "./adminQueries.js";
const router = Router();

// get a user from either table with email
export function getUserByEmail(table, email) {
	return new Promise((resolve, reject) => {
		const query = `SELECT * FROM ${table} WHERE Email = ?`;
		con.query(query, [email], (err, rows) => {
			if (err) {
				console.error(err.message);
				reject(err);
			}
			resolve(rows[0]);
		});
	});
}

// delete a student from the database
router.post('/DeleteStudent', (req,res) => {
	const {email} = req.body;
	const query = "DELETE FROM Users WHERE Users.Email = ?";
	con.query(query, [email], function(err,rows) {
		if (err) {
			console.error(err.message);
			return res.status(500).json({ error: "DELETING STUDENT" });
		}

		// contest doesn't exist
		if (rows.affectedRows === 0) return res.status(404).json({ error: "NO STUDENT" });
		return res.status(200).json({ success: true });
	});
})

// get all of the users with the same key as admin
router.post('/getAllUsers', (req,res) => {
	const { email } = req.body;
	return getAdminID(email).then((Admin) => {
		const query = 'SELECT * FROM Users WHERE AdminID = ?';
		con.query(query,[Admin.AdminID], (err,rows) => {
			if (err) {
				console.error(err.message);
				return res.status(500).json({ error: 'GETTING USERS '});
			}
			if(rows.length === 0)
				res.status(404).json({ error: 'NO ADMIN/USERS FOUND '});
			else
				res.json(rows); 
		});
	});
});

// return everything on a user by email
router.post('/getUser', async(req,res) => {
	const { email } = req.body;
	return getUserByEmail('Users',email).then((row) => {
		if (row) res.json(row);
		else return res.status(404).json({ error: 'USER NOT FOUND' });
	})
});

router.post('/getUsername', async(req,res) => {
	const { email } = req.body;
	return getUserByEmail('Users',email).then((row) => {
		if (row) res.json(row.Name);
		else return res.status(404).json({ error: 'USER NOT FOUND' });
	})
});

// set the new name of the user
router.post('/setUserName', (req,res) => {
	const { name, email } = req.body;
	const query = 'UPDATE Users SET Name = ? WHERE Email = ?';
	con.query(query, [name,email], (err) => {
		if (err){
			console.error(err.message);
			return res.status(500).json({ error: err });
		}
		return res.status(200).json({ success: true });
	});
});


// get all users from an AdminID
export async function getUsersFromAdmin(AdminID) {
	return new Promise((resolve,reject) => {
		const query = 'SELECT * FROM Users WHERE AdminID = ?';
		con.query(query, [AdminID], (err,rows) => {
			if (err) {
				console.error(err.message);
				reject(err);
			}
			resolve(rows);
		})
	});
}

export default router;