'use strict';

const path = require('path');
const ejs = require('ejs')
const express = require('express');
const compression = require('compression');

// Set up the express app.
const app = express();

// Hold list of functions to run when the server is ready
app.onListen = [];

// Allow the express app to be exported into other files. 
module.exports = app;

// Hold onto the auth middleware
const middleware = require('./middleware/auth');

// OAuth routes
const { router: oauthRouter, authRouter: oauthApiRouter, discovery } = require('./routes/oauth');

// Grab the projects PubSub
app.contoller = require('./controller');

// Background services (self-initializing on require).
require('./services/update_check');
require('./services/ldap_monitor');

// Push pubsub over the socket and back.
app.onListen.push(function(){
  app.io.use(middleware.authIO);

  app.contoller.ps.subscribe(/./g, function(data, topic){
    app.io.emit('P2PSub', { topic, data });
  });                                 

  app.io.on('connection', (socket) => {
    // console.log('socket', socket)
    var user = socket.user;
    socket.on('P2PSub', (msg) => {
      app.contoller.ps.publish(msg.topic, {...msg.data, __from:socket.user});
      // socket.broadcast.emit('P2PSub', msg);
    });
  });
  
  // Initialize Theta Agent WebSockets. The REST router is already mounted
  // synchronously above (see the /api/agent mount); this hook only wires the WS.
  require('./routes/api_agent').initAgentWebSockets(app);
});

// Gzip text responses (HTML/JS/CSS/JSON). The admin UI loads ~13 separate,
// uncompressed vendor JS/CSS files on every full page navigation (a
// traditional multi-page app, not an SPA) — this alone meaningfully cuts
// bytes-over-the-wire and perceived load time on a real network, where it
// matters far more than on localhost.
app.use(compression());

// load the JSON parser middleware. Express will parse JSON into native objects
// for any request that has JSON in its content type.
app.use(express.json());
app.set('trust proxy', 1);

// Set up the templating engine to build HTML for the front end.
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

// Per-app values for the shared UI shell (views/top.ejs + views/bottom.ejs).
// Set as an app local so every res.render has it, including routes that don't
// spread the routers' `values` object.
app.locals.ui = require('./utils/ui');

// Have express server static content( images, CSS, browser JS) from the public
// local folder. maxAge is short since this is the app's own JS/CSS, which
// changes on every deploy and isn't cache-busted/fingerprinted.
app.use('/static', express.static(path.join(__dirname, 'public'), {maxAge: '1h'}));
app.use('/resources', express.static(path.join(__dirname, 'public/resources'), {maxAge: '1h'}));

// Routes for front end content.
app.use('/', require('./routes/index'));

// Local, in-app copy of the project's documentation (README, DEPLOYMENT,
// API.md, docs/*) -- public, no auth, so it's readable even by a locked-out
// admin or an air-gapped operator with no route to GitHub Pages.
app.use('/docs', require('./routes/docs'));

// API routes for authentication. 
app.use('/api/auth',  require('./routes/auth'));

// API routes for working with users. All endpoints need to be have valid user.
app.use('/api/user', middleware.auth, require('./routes/user'));

app.use('/api/token', middleware.auth, require('./routes/token'));

app.use('/api/group', middleware.auth, require('./routes/group'));
app.use('/api/notification', middleware.auth, require('./routes/notification'));
app.use('/api/discovery', middleware.auth, require('./routes/discovery'));
app.use('/api/directory-admin', middleware.auth, require('./routes/api_directory_admin'));
// Multi-site join (site join keys, master export, spoke join) — mounted before
// the 404 catch-all; /api/site/export is reachable by other hosts with a
// Bearer site-join-key (no admin session).
app.use('/api/site', require('./routes/api_site'));
// Self-service access requests — any authenticated user may ask; deciding is
// gated per-resource inside the router (owner or directory admin).
app.use('/api/access-requests', middleware.auth, require('./routes/access_request'));
app.use('/api/update-check', middleware.auth, require('./routes/update_check'));
app.use('/api/tos', middleware.auth, require('./routes/tos'));
app.use('/api/metrics', middleware.auth, require('./routes/api_metrics'));
app.use('/api/conf', middleware.auth, require('./routes/api_conf'));
// Self-service API tokens (PATs) — owner-scoped, no admin group required.
app.use('/api/api-token', middleware.auth, require('./routes/api_token'));

// theta-agent REST API. Mounted SYNCHRONOUSLY (before the 404 catch-all below),
// not from an onListen hook — a router registered post-listen would sit behind
// the terminal 404 handler and make every /api/agent/* request 404. The agent
// WebSocket handler (routes/api_agent.initAgentWebSockets) still runs on onListen.
app.use('/api/agent', require('./routes/api_agent'));

// LDAP-over-HTTPS API (DESIGN.md §3). Bearer-authed (agent token or PAT); the
// SSO performs the real LDAP bind/search against its own OpenLDAP. Mounted
// synchronously for the same reason as /api/agent — it must sit before the 404
// catch-all.
app.use('/api/v1/ldap', require('./routes/api_ldap'));

// Agent-facing operations (DESIGN.md §5, §6): node-scoped secrets, IAM. The
// caller is the agent itself (Bearer agent token), not an admin session.
app.use('/api/v1/agent', require('./routes/api_agent_ops'));

// OAuth 2.0 / OpenID Connect
app.use('/oauth', oauthRouter);
app.use('/api/oauth', middleware.auth, oauthApiRouter);
app.use('/api/oauth/client', middleware.auth, require('./routes/oauth_client'));
app.get('/.well-known/openid-configuration', discovery);
app.use('/api/webhook', require('./routes/webhook'));
// Plugin instances — loadable/unloadable, configurable plugin copies with
// per-instance secrets in OpenBao (secret/plugins/*). Admin-only (gated inside
// the router to app_sso_admin / app_sso_directory_admin).
app.use('/api/plugins', middleware.auth, require('./routes/api_plugins'));

// OpenBao vault API. The broker mints a server-side scoped token per user
// (per-user user-<uid> or, for admins, sso-admin), enforces the path prefix
// (scopeGuard), and injects ONLY that token into the proxied request — the
// client's sso auth headers are stripped and never reach OpenBao. Non-admins
// are confined to secret/users/<uid>/*; admins roam all of secret/. The
// admin-only app-token mint route is mounted BEFORE the proxy so it isn't
// shadowed by the catch-all /api/vault proxy.
const vaultBroker = require('./utils/vault_broker');
app.use('/api/vault/apps', middleware.auth, vaultBroker.mintAppRouter);
app.use('/api/vault', middleware.auth, vaultBroker.scopeGuard, vaultBroker.vaultProxy());
// Shared secrets (metadata + grants; data reads go through /api/vault proxy).
app.use('/api/shared-secrets', middleware.auth, require('./routes/api_shared_secrets'));

// Catch 404 and forward to error handler. If none of the above routes are
// used, this is what will be called.
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.message = 'Page not found'
  err.status = 404;
  next(err);
});

// Error handling
app.use(function(err, req, res, next) {
  const SILENT_404S = ['/.well-known/'];
  const isSilent404 = err.status === 404 && SILENT_404S.some(p => req.url.startsWith(p));
  if (!isSilent404) console.error(err.status || res.status, err.name, req.method, req.url);
  if(![401, 404].includes(err.status || res.status)){
    console.error(err.message);
    console.error(err.stack);
    console.error('=========================================');
  }

  res.status(err.status || 500);
  if (req.accepts('html') && !req.originalUrl.startsWith('/api/')) {
    const conf = require('@simpleworkjs/conf');
    const buildInfo = require('./utils/build_info');
    res.render('error', { 
      name: conf.name, 
      title: 'Error',
      titleIcon: '',
      logo: conf.logo,
      error: err,
      ...buildInfo
    });
  } else {
    res.json({name: err.name, message: err.message});
  }
});