import createError from 'http-errors'
import express from 'express'

import compression from 'compression'
import path from 'node:path'
import cookieParser from 'cookie-parser'
import csurf from 'csurf'
import rateLimit from 'express-rate-limit'

import session from 'express-session'
import FileStore from 'session-file-store'

import * as permissionHandlers from './handlers/permissions.js'
import routerLogin from './routes/login.js'
import routerDashboard from './routes/dashboard.js'
import routerApi from './routes/api.js'
import routerPrint from './routes/print.js'
import routerMaps from './routes/maps.js'
import routerLots from './routes/lots.js'
import routerLotOccupancies from './routes/lotOccupancies.js'
import routerWorkOrders from './routes/workOrders.js'
import routerReports from './routes/reports.js'
import routerAdmin from './routes/admin.js'

import * as configFunctions from './helpers/functions.config.js'
import * as printFunctions from './helpers/functions.print.js'
import * as dateTimeFns from '@cityssm/expressjs-server-js/dateTimeFns.js'
import * as stringFns from '@cityssm/expressjs-server-js/stringFns.js'
import * as htmlFns from '@cityssm/expressjs-server-js/htmlFns.js'

import { version } from './version.js'

import * as databaseInitializer from './helpers/initializer.database.js'

import { apiGetHandler } from './handlers/permissions.js'
import { getSafeRedirectURL } from './helpers/functions.authentication.js'

import debug from 'debug'
const debugApp = debug('lot-occupancy-system:app')

/*
 * INITIALIZE THE DATABASE
 */

databaseInitializer.initializeDatabase()

/*
 * INITIALIZE APP
 */

const __dirname = '.'

export const app = express()

app.disable('X-Powered-By')

if (!configFunctions.getProperty('reverseProxy.disableEtag')) {
  app.set('etag', false)
}

// View engine setup
app.set('views', path.join(__dirname, 'views'))
app.set('view engine', 'ejs')

if (!configFunctions.getProperty('reverseProxy.disableCompression')) {
  app.use(compression())
}

app.use((request, _response, next) => {
  debugApp(`${request.method} ${request.url}`)
  next()
})

app.use(express.json())

app.use(
  express.urlencoded({
    extended: false
  })
)

app.use(cookieParser())
app.use(
  csurf({
    cookie: true
  })
)

/*
 * Rate Limiter
 */

app.use(
  rateLimit({
    windowMs: 10_000,
    max: 200
  })
)

/*
 * STATIC ROUTES
 */

const urlPrefix = configFunctions.getProperty('reverseProxy.urlPrefix')

if (urlPrefix !== '') {
  debugApp('urlPrefix = ' + urlPrefix)
}

app.use(urlPrefix, express.static(path.join('public')))

app.use(
  urlPrefix + '/lib/bulma-calendar',
  express.static(path.join('node_modules', 'bulma-calendar', 'dist'))
)

app.use(
  urlPrefix + '/lib/cityssm-bulma-js',
  express.static(path.join('node_modules', '@cityssm', 'bulma-js', 'dist'))
)

app.use(
  urlPrefix + '/lib/cityssm-bulma-webapp-js',
  express.static(path.join('node_modules', '@cityssm', 'bulma-webapp-js'))
)

app.use(urlPrefix + '/lib/fa', express.static(path.join('node_modules', '@fortawesome', 'fontawesome-free')))

app.use(urlPrefix + '/lib/leaflet', express.static(path.join('node_modules', 'leaflet', 'dist')))

app.use(urlPrefix + '/lib/randomcolor', express.static(path.join('node_modules', 'randomcolor')))

/*
 * SESSION MANAGEMENT
 */

const sessionCookieName: string = configFunctions.getProperty('session.cookieName')

const FileStoreSession = FileStore(session)

// Initialize session
app.use(
  session({
    store: new FileStoreSession({
      path: './data/sessions',
      logFn: debug('lot-occupancy-system:session'),
      retries: 20
    }),
    name: sessionCookieName,
    secret: configFunctions.getProperty('session.secret'),
    resave: true,
    saveUninitialized: false,
    rolling: true,
    cookie: {
      maxAge: configFunctions.getProperty('session.maxAgeMillis'),
      sameSite: 'strict'
    }
  })
)

// Clear cookie if no corresponding session
app.use((request, response, next) => {
  if (request.cookies[sessionCookieName] && !request.session.user) {
    response.clearCookie(sessionCookieName)
  }

  next()
})

// Redirect logged in users
const sessionChecker = (request: express.Request, response: express.Response, next: express.NextFunction) => {
  if (request.session.user && request.cookies[sessionCookieName]) {
    return next()
  }

  const redirectUrl = getSafeRedirectURL(request.originalUrl)

  return response.redirect(`${urlPrefix}/login?redirect=${encodeURIComponent(redirectUrl)}`)
}

/*
 * ROUTES
 */

// Make the user and config objects available to the templates

app.use((request, response, next) => {
  response.locals.buildNumber = version

  response.locals.user = request.session.user
  response.locals.csrfToken = request.csrfToken()

  response.locals.configFunctions = configFunctions
  response.locals.printFunctions = printFunctions
  response.locals.dateTimeFunctions = dateTimeFns
  response.locals.stringFunctions = stringFns
  response.locals.htmlFunctions = htmlFns

  response.locals.urlPrefix = configFunctions.getProperty('reverseProxy.urlPrefix')

  next()
})

app.get(urlPrefix + '/', sessionChecker, (_request, response) => {
  response.redirect(urlPrefix + '/dashboard')
})

app.use(urlPrefix + '/dashboard', sessionChecker, routerDashboard)

app.use(urlPrefix + '/api/:apiKey', apiGetHandler, routerApi)

app.use(urlPrefix + '/print', sessionChecker, routerPrint)
app.use(urlPrefix + '/maps', sessionChecker, routerMaps)
app.use(urlPrefix + '/lots', sessionChecker, routerLots)
app.use(urlPrefix + '/lotOccupancies', sessionChecker, routerLotOccupancies)
app.use(urlPrefix + '/workOrders', sessionChecker, routerWorkOrders)

app.use(urlPrefix + '/reports', sessionChecker, routerReports)
app.use(urlPrefix + '/admin', sessionChecker, permissionHandlers.adminGetHandler, routerAdmin)

app.all(urlPrefix + '/keepAlive', (_request, response) => {
  response.json(true)
})

app.use(urlPrefix + '/login', routerLogin)

app.get(urlPrefix + '/logout', (request, response) => {
  if (request.session.user && request.cookies[sessionCookieName]) {
    request.session.destroy(() => {
      response.clearCookie(sessionCookieName)
      response.redirect(urlPrefix + '/')
    })
  } else {
    response.redirect(urlPrefix + '/login')
  }
})

// Catch 404 and forward to error handler
app.use((request, _response, next) => {
  debugApp(request.url)
  next(createError(404, 'File not found.'))
})

export default app