import { VariableReplacer, Variables } from "../../../../browser/text/replacing/VariableReplacer";
import { CryptIO } from "../../../crypt/CryptIO";
import { RJLog } from "../../../log/RJLog";
import { RequestHandler, RequestType } from "../../RequestHandler";
import { FastifyRequest, FastifyReply } from 'fastify';

export class RequestPasswordChangeHandler extends RequestHandler
{ 
  static url = "/request-password-change";
  constructor(){ super( RequestType.POST, RequestPasswordChangeHandler.url ); }

  static USER_NAME = "USER_NAME";
  static CHANGE_PASSWORD_LINK = "CONFIRMATION_LINK";

  static EMAIL_TITLE = "Password Change Request";
  static EMAIL_MESSAGE = 
  `
    <b>Hi {{${RequestPasswordChangeHandler.USER_NAME}}}!</b>
    <br>
    You requested to change your password, here is your link:
    <br>
    <a href="{{${RequestPasswordChangeHandler.CHANGE_PASSWORD_LINK}}}">CHANGE PASSWORD</a>
    <br>
    <br>
    Cheers!
  
  `

  async _handle( request:FastifyRequest, reply:FastifyReply )
  { 
    let requestBody = request.body;
    let { email } = requestBody as { email:string };

    if ( ! email )
    { 
      return this.sendError( "Missing email" );
    }

    let userData = await this.userDB.byEmail( email );

    if ( ! userData )
    {
      return this.sendError( "Email not found" );
    }

    let token = await this.userDB.createPasswordChange( userData, this.ip );

    let changePasswordURL = this._ums._settings.changePasswordURL; 

    let id = userData.id;

    let link = `${changePasswordURL}?id=${id}&token=${token.id}`;

    await this.sendPasswordChangeEmail( email, userData.name, link );

    return this.sendInfo( "Send password change email" );
  }

  async sendPasswordChangeEmail( email:string, userName:string, link:string ):Promise<void>
  {    

    let variables:Variables = { 
      [ RequestPasswordChangeHandler.USER_NAME ] : userName,
      [ RequestPasswordChangeHandler.CHANGE_PASSWORD_LINK ] : link     
    };

    let message = VariableReplacer.replace( RequestPasswordChangeHandler.EMAIL_MESSAGE, variables, "{{", "}}" );
    let title = VariableReplacer.replace( RequestPasswordChangeHandler.EMAIL_TITLE, variables, "{{", "}}" ); 
    
    await this._ums.sendEmail( email, title, message );
    
    return Promise.resolve();
  }
  

}