// auth.js
// Copyright (C) 2024 DTP Technologies, LLC
// All Rights Reserved

'use strict';

import express from 'express';
import multer from 'multer';

import mongoose from 'mongoose';
const ConnectToken = mongoose.model('ConnectToken');

import { v4 as uuidv4 } from 'uuid';
import SvgCaptcha from 'svg-captcha';

import { SiteController, SiteError } from '../../lib/site-lib.js';

export default class AuthController extends SiteController {

  static get name ( ) { return 'AuthController'; }
  static get slug ( ) { return 'auth'; }

  constructor (dtp) {
    super(dtp, AuthController);
  }

  async start ( ) {
    const {
      csrfToken: csrfTokenService,
      limiter: limiterService,
      session: sessionService,
    } = this.dtp.services;

    this.templates = {
      passwordResetComplete: this.loadViewTemplate('auth/password-reset-complete.pug'),
    };

    const upload = multer({ });
    const authRequired = sessionService.authCheckMiddleware({ requireLogin: true });

    const router = express.Router();
    this.dtp.app.use('/auth', router);

    router.use(async (req, res, next) => {
      res.locals.currentView = 'auth';
      return next();
    });

    router.post(
      '/otp/enable',
      limiterService.create(limiterService.config.auth.postOtpEnable),
      this.postOtpEnable.bind(this),
    );

    router.post(
      '/otp/auth',
      limiterService.create(limiterService.config.auth.postOtpAuthenticate),
      this.postOtpAuthenticate.bind(this),
    );

    router.post(
      '/forgot-password',
      limiterService.create(limiterService.config.auth.postForgotPassword),
      csrfTokenService.middleware({ name: 'forgot-password' }),
      this.postForgotPassword.bind(this),
    );
    router.post(
      '/password-reset',
      limiterService.create(limiterService.config.auth.postPasswordReset),
      upload.none(),
      csrfTokenService.middleware({ name: 'password-reset' }),
      this.postPasswordReset.bind(this),
    );

    router.post(
      '/login',
      limiterService.create(limiterService.config.auth.postLogin),
      upload.none(),
      csrfTokenService.middleware({ name: 'login' }),
      this.postLogin.bind(this),
    );

    router.get(
      '/api-token/personal',
      authRequired,
      limiterService.create(limiterService.config.auth.getPersonalApiToken),
      this.getPersonalApiToken.bind(this),
    );

    router.get(
      '/socket-token',
      authRequired,
      limiterService.create(limiterService.config.auth.getSocketToken),
      this.getSocketToken.bind(this),
    );

    router.get(
      '/forgot-password',
      limiterService.create(limiterService.config.auth.getForgotPasswordForm),
      this.getForgotPasswordForm.bind(this),
    );
    router.get(
      '/password-reset',
      limiterService.create(limiterService.config.auth.getResetPasswordForm),
      this.getResetPasswordForm.bind(this),
    );

    router.get(
      '/logout',
      authRequired,
      limiterService.create(limiterService.config.auth.getLogout),
      this.getLogout.bind(this),
    );

    return router;
  }

  async postOtpEnable (req, res, next) {
    const {
      actionAudit: actionAuditService,
      otpAuth: otpAuthService,
    } = this.dtp.services;
    
    const service = req.body['otp-service'];
    const secret = req.body['otp-secret'];
    const token = req.body['otp-token'];
    const otpRedirectURL = req.body['otp-redirect'] || '/';
    
    try {
      this.log.info('enabling OTP protections', { service, secret, token });
      res.locals.otpAccount = await otpAuthService.createOtpAccount(req, service, secret, token);
      res.locals.otpRedirectURL = otpRedirectURL;
      await actionAuditService.auditRequest(req, 'Enabled 2FA');
      res.render('otp/new-account');
    } catch (error) {
      this.log.error('failed to enable OTP protections', {
        service, error,
      });
      return next(error);
    }
  }

  async postOtpAuthenticate (req, res, next) {
    const {
      actionAudit: actionAuditService,
      otpAuth: otpAuthService,
    } = this.dtp.services;

    if (!req.user) {
      return res.status(403).json({
        success: false,
        message: 'Must be logged in',
      });
    }
    const service = req.body['otp-service'];
    if (!service) {
      return res.status(400).json({
        success: false,
        message: 'Must specify OTP service name',
      });
    }
    const passcode = req.body['otp-passcode'];
    if (!passcode || (typeof passcode !== 'string') || (passcode.length !== 6)) {
      return res.status(400).json({
        success: false,
        message: 'Must include a valid passcode',
      });
    }
    try {
      await otpAuthService.startOtpSession(req, service, passcode);
      await actionAuditService.auditRequest(req, '2FA credentials provided successfully');
      return res.redirect(req.body['otp-redirect']);
    } catch (error) {
      this.log.error('failed to verify one-time password for 2FA', {
        service, error,
      }, req.user);
      return next(error);
    }
  }

  async postForgotPassword (req, res, next) {
    const { user: userService } = this.dtp.services;
    try {
      res.locals.account = await userService.requestPasswordReset(req.body.username);
      res.render('auth/password-reset-sent');
    } catch (error) {
      this.log.error("failed to request password reset", { error });
      return next(error);
    }
  }

  async postPasswordReset (req, res) {
    const { authToken: authTokenService, user: userService } = this.dtp.services;
    try {
      if (!req.body.password) {
        return res.status(200).json({ success: false, message: 'Please enter a new password' });
      }
      if ((typeof req.body.password !== 'string') || (req.body.length < 8)) {
        return res.status(200).json({ success: false, message: 'The password is invalid or too short' });
      }
      if (!req.body.passwordVerify) {
        return res.status(200).json({ success: false, message: 'Please also verify your new password' });
      }
      if (req.body.password !== req.body.passwordVerify) {
        return res.status(200).json({ success: false, message: 'The password and password verify do not match.' });
      }

      res.locals.authToken = await authTokenService.claim(req.body.authToken);

      res.locals.accountId = mongoose.Types.ObjectId.createFromHexString(req.body.accountId);
      res.locals.account = await userService.getUserAccount(res.locals.accountId);
      this.log.alert('updating user password', {
        userId: res.locals.account._id,
        username: res.locals.account.username_lc,
        ip: req.ip,
      });
      await userService.updatePassword(res.locals.account, req.body.password);

      const displayList = this.createDisplayList('password-reset');
      displayList.replaceElement('section#view-content', await this.renderTemplate(this.templates.passwordResetComplete, res.locals));

      res.status(200).json({ success: true, displayList });
    } catch (error) {
      this.log.error("failed to update account password", { error });
      return res.status(error.statusCode || 500).json({
        success: false,
        message: error.message,
      });
    }
  }

  async postLogin (req, res, next) {
    const { user: userService } = this.dtp.services;
    await userService.login(req, res, next, { redirectUrl: '/' });
  }

  async getPersonalApiToken (req, res, next) {
    try {
      const { apiGuard: apiGuardService } = this.dtp.platform.services;
      res.locals.apiToken = await apiGuardService.createApiToken(req.user, [
        'account-read',
        // additional scopes go here
      ]);
      res.render('api-token/view');
    } catch (error) {
      this.log.error('failed to generate API token', { error });
      return next(error);
    }
  }

  async getSocketToken (req, res, next) {
    const { actionAudit: actionAuditService } = this.dtp.services;
    try {
      const token = await ConnectToken.create({
        created: new Date(),
        userType: 'User',
        user: req.user._id,
        consumerType: 'User',
        consumer: req.user._id,
        token: uuidv4(),
      });
      await actionAuditService.auditRequest(req, 'Received socket connect token');
      res.status(200).json({
        success: true,
        token: token.token
      });
    } catch (error) {
      this.log.error('failed to create Socket.io connect token', { error });
      return next(error);
    }
  }

  async getForgotPasswordForm (req, res) {
    const { csrfToken: csrfTokenService } = this.dtp.services;
    res.locals.csrfForgotPassword = await csrfTokenService.create(req, {
      name: 'forgot-password',
      expiresMinutes: 15,
    });
    res.locals.captcha = SvgCaptcha.create({
      size: Math.round(Math.random() * 2) + 4,
      width: 280,
      height: 80,
      noise: Math.floor(Math.random() * 2) + 1,
      // background: '#d8d8d8',
      color: false,
    });
    req.session.dtp = req.session.dtp || { };
    req.session.dtp.captcha = req.session.dtp.captcha || { };
    req.session.dtp.captcha.forgotPassword = res.locals.captcha.text;

    res.render('auth/forgot-password');
  }

  async getResetPasswordForm (req, res, next) {
    const {
      csrfToken: csrfTokenService,
      authToken: authTokenService,
      user: userService,
    } = this.dtp.services;
    try {
      // tokens are UUIDv4: efcfc5e3-700c-4d21-9b00-0d1a14a1ab6d
      if (!req.query || !req.query.t) {
        throw new SiteError(400, 'Must include authentication token');
      }

      res.locals.authToken = await authTokenService.getByValue(req.query.t);

      res.locals.account = await userService.getUserAccount(res.locals.authToken.data._id);
      delete res.locals.account.passwordSalt;
      delete res.locals.account.password;
      delete res.locals.account.favoriteStickers;

      res.locals.csrfPasswordReset = await csrfTokenService.create(req, {
        name: 'password-reset',
        expiresMinutes: 15,
      });

      this.log.info('presenting password reset form', {
        tokenId: res.locals.authToken._id,
        token: res.locals.authToken.token,
        userId: res.locals.account._id,
        username: res.locals.account.username_lc,
      });
      res.render('auth/password-reset.pug');
    } catch (error) {
      this.log.error('failed to present password reset form', { error });
      return next(error);
    }
  }

  async getLogout (req, res, next) {
    const { actionAudit: actionAuditService } = this.dtp.services;

    if (!req.user) {
      return next(new SiteError(403, 'You are not signed in'));
    }

    await actionAuditService.auditRequest(req, 'Logged out');
    req.logout((err) => {
      if (err) {
        this.log.error('failed to destroy browser session', { err });
        return next(err);
      }
      req.session.destroy((err) => {
        if (err) {
          this.log.error('failed to destroy browser session', { err });
          return next(err);
        }
        res.redirect('/');
      });
    });
  }
}