import { DateHelper } from "../../browser/date/DateHelper";
import { DateMath } from "../../browser/date/DateMath";
import { ISOTimeStamp } from "../../browser/date/ISOTimeStamp";
import { CryptIO } from "../crypt/CryptIO";
import { Token } from "./Token";
import { UserManagementServer } from "./UserManagementServer";

export class TokenDB
{  
  static _defaultExpirationDurationMinutes = 20;

  _ums:UserManagementServer;
  _tokens = new Map<string,Token>();

  constructor( ums:UserManagementServer )
  {
    this._ums = ums;
  }

  async update()
  {

  }

  async create( ip:string, expireDurationInMinutes:number = -1 ):Promise<Token>
  {
    expireDurationInMinutes = expireDurationInMinutes == -1 ? TokenDB._defaultExpirationDurationMinutes : expireDurationInMinutes;

    let token = new Token();
    token.id = CryptIO.createUUID();
    token.hashedIP = await CryptIO.hash( ip );
    token.expires = ISOTimeStamp.fromDate( DateMath.fromNowAddMinutes( expireDurationInMinutes ) ); 

    this._tokens.set( token.id, token );

    return Promise.resolve( token );
  }

  async validate( token:Token, ip:string ):Promise<boolean>
  {
    if ( this._tokens.get( token.id ) != token )
    {
      return Promise.resolve( false );
    }

    if ( DateMath.isExpired( ISOTimeStamp.toDate( token.expires ) ) )
    {
      return Promise.resolve( false );
    }

    let isVerified = await CryptIO.verifyHash( ip, token.hashedIP );

    if ( isVerified )
    {
      return true;
    }

    return Promise.resolve( false );
  }
}