import jwt from "jsonwebtoken";
import { JWTData, JWTToken } from "../type/jwtTypes";
import { JWT_SECRET, JWT_EXPIRATION } from "../env.defaults";
import InternalException from "../exceptions/internalException";
import RolePermissionService from "../service/user/rolePermissionService";
import UserPermissionService from "../service/user/userPermissionService";
import UserService from "../service/user/userService";
import PermissionHelper from "./permissionHelper";

export abstract class JWTHelper {
  static validate(token: string): Promise<string | jwt.JwtPayload> {
    return new Promise<string | jwt.JwtPayload>((resolve, reject) => {
      jwt.verify(token, JWT_SECRET, (err, decoded) => {
        if (err) reject(err.message);
        else resolve(decoded);
      });
    });
  }

  static create(data: JWTData): Promise<string> {
    return new Promise<string>((resolve, reject) => {
      jwt.sign(
        data,
        JWT_SECRET,
        {
          expiresIn: JWT_EXPIRATION,
        },
        (err, token) => {
          if (err) reject(err.message);
          else resolve(token);
        }
      );
    });
  }

  static decode(token: string): Promise<string | jwt.JwtPayload> {
    return new Promise<string | jwt.JwtPayload>((resolve, reject) => {
      try {
        let decoded = jwt.decode(token);
        resolve(decoded);
      } catch (err) {
        reject(err.message);
      }
    });
  }

  static async buildToken(id: number): Promise<string> {
    let { firstname, lastname, mail, username, isOwner } = await UserService.getById(id);
    let userPermissions = await UserPermissionService.getByUser(id);
    let userPermissionStrings = userPermissions.map((e) => e.permission);
    let userRoles = await UserService.getAssignedRolesByUserId(id);
    let rolePermissions =
      userRoles.length != 0 ? await RolePermissionService.getByRoles(userRoles.map((e) => e.id)) : [];
    let rolePermissionStrings = rolePermissions.map((e) => e.permission);
    let permissionObject = PermissionHelper.convertToObject([...userPermissionStrings, ...rolePermissionStrings]);

    let jwtData: JWTToken = {
      userId: id,
      mail: mail,
      username: username,
      firstname: firstname,
      lastname: lastname,
      isOwner: isOwner,
      permissions: permissionObject,
    };

    return await JWTHelper.create(jwtData)
      .then((result) => {
        return result;
      })
      .catch((err) => {
        throw new InternalException("Failed accessToken creation", err);
      });
  }
}