import { new_client } from '../db/db_client';
import { Member, User } from '../types/member';
import { Either, eitherLeft, eitherRight } from '../utils/utils';

type DBMembre = {
	id_membre: number;
	nom_membre: string;
	mdp_membre: string;
};

function db2member(data: DBMembre) {
	const member: Member = {
		id_member: data.id_membre,
		name: data.nom_membre,
		password: data.mdp_membre,
	};
	return member;
}

const getMember = async (idOrName: number | string): Promise<Either<Member, string>> => {
  const client = new_client();
  await client.connect();
  let res;
  if (typeof idOrName !== 'number') {
    res = await client.query("SELECT * FROM membres WHERE nom_membre=$1;", [`${idOrName}`]);
  } else {
    res = await client.query("SELECT * FROM membres WHERE id_membre=$1;", [idOrName]);
  }
  if (res.rows.length === 0) {
    await client.end();
    return eitherRight<Member, string>("Does not exist.");
  }
  const member = db2member(res.rows[0]);
		await client.end();

  return eitherLeft<Member, string>(member);
}

const getAllMembers = async () => {
  const client = new_client();
  await client.connect();
  const res = await client.query("SELECT * FROM membres");
  await client.end();
  return res.rows.map(db2member);
}

const createMember = async (name: string, passwd: string): Promise<Either<Member, string>> => {
  const gettingMember = await getMember(name);
  if (!gettingMember.hasRight) {
    return eitherRight<Member, string>("Already in database.");
  }
  const client = new_client();
  await client.connect();
  const res = await client.query("INSERT INTO membres (nom_membre, mdp_membre) VALUES ($1, $2) RETURNING *;", [`${name}`, `${passwd}`]);
  if (res.rows.length === 0) {
    await client.end();
    return eitherRight<Member, string>("Something went wrong");
  }
  const member: Member = { id_member: res.rows[0].id_membre, name: res.rows[0].nom_membre, password: res.rows[0].mdp_membre };
  await client.end();
  return eitherLeft<Member, string>(member);
}

const getDefaultUser = (): User => ({ id_member: -1, name: "unknown" });
const getDefaultMember = (): Member => ({ id_member: -1, name: "unknown", password: "none" });

function userAdapter(member: Member): User {
  return { id_member: member.id_member, name: member.name };
}

const memberService = {
	getMember,
	createMember,
	getDefaultUser,
	getDefaultMember,
	userAdapter,
	getAllMembers,
};

export default memberService;