import express from 'express'
import { join } from 'path'
import { logger } from '@server/helpers/logger'
import { CONFIG } from '@server/initializers/config'
import { buildRateLimiter } from '@server/middlewares'
import { optionalAuthenticate } from '@server/middlewares/auth'
import { getCompleteLocale, is18nLocale } from '../../shared/core-utils/i18n'
import { HttpStatusCode } from '../../shared/models/http/http-error-codes'
import { PluginType } from '../../shared/models/plugins/plugin.type'
import { isProdInstance } from '../helpers/core-utils'
import { PLUGIN_GLOBAL_CSS_PATH } from '../initializers/constants'
import { PluginManager, RegisteredPlugin } from '../lib/plugins/plugin-manager'
import { getExternalAuthValidator, getPluginValidator, pluginStaticDirectoryValidator } from '../middlewares/validators/plugins'
import { serveThemeCSSValidator } from '../middlewares/validators/themes'

const sendFileOptions = {
  maxAge: '30 days',
  immutable: isProdInstance()
}

const pluginsRouter = express.Router()

const pluginsRateLimiter = buildRateLimiter({
  windowMs: CONFIG.RATES_LIMIT.PLUGINS.WINDOW_MS,
  max: CONFIG.RATES_LIMIT.PLUGINS.MAX
})

pluginsRouter.get('/plugins/global.css',
  pluginsRateLimiter,
  servePluginGlobalCSS
)

pluginsRouter.get('/plugins/translations/:locale.json',
  pluginsRateLimiter,
  getPluginTranslations
)

pluginsRouter.get('/plugins/:pluginName/:pluginVersion/auth/:authName',
  pluginsRateLimiter,
  getPluginValidator(PluginType.PLUGIN),
  getExternalAuthValidator,
  handleAuthInPlugin
)

pluginsRouter.get('/plugins/:pluginName/:pluginVersion/static/:staticEndpoint(*)',
  pluginsRateLimiter,
  getPluginValidator(PluginType.PLUGIN),
  pluginStaticDirectoryValidator,
  servePluginStaticDirectory
)

pluginsRouter.get('/plugins/:pluginName/:pluginVersion/client-scripts/:staticEndpoint(*)',
  pluginsRateLimiter,
  getPluginValidator(PluginType.PLUGIN),
  pluginStaticDirectoryValidator,
  servePluginClientScripts
)

pluginsRouter.use('/plugins/:pluginName/router',
  pluginsRateLimiter,
  getPluginValidator(PluginType.PLUGIN, false),
  optionalAuthenticate,
  servePluginCustomRoutes
)

pluginsRouter.use('/plugins/:pluginName/:pluginVersion/router',
  pluginsRateLimiter,
  getPluginValidator(PluginType.PLUGIN),
  optionalAuthenticate,
  servePluginCustomRoutes
)

pluginsRouter.get('/themes/:pluginName/:pluginVersion/static/:staticEndpoint(*)',
  pluginsRateLimiter,
  getPluginValidator(PluginType.THEME),
  pluginStaticDirectoryValidator,
  servePluginStaticDirectory
)

pluginsRouter.get('/themes/:pluginName/:pluginVersion/client-scripts/:staticEndpoint(*)',
  pluginsRateLimiter,
  getPluginValidator(PluginType.THEME),
  pluginStaticDirectoryValidator,
  servePluginClientScripts
)

pluginsRouter.get('/themes/:themeName/:themeVersion/css/:staticEndpoint(*)',
  pluginsRateLimiter,
  serveThemeCSSValidator,
  serveThemeCSSDirectory
)

// ---------------------------------------------------------------------------

export {
  pluginsRouter
}

// ---------------------------------------------------------------------------

function servePluginGlobalCSS (req: express.Request, res: express.Response) {
  // Only cache requests that have a ?hash=... query param
  const globalCSSOptions = req.query.hash
    ? sendFileOptions
    : {}

  return res.sendFile(PLUGIN_GLOBAL_CSS_PATH, globalCSSOptions)
}

function getPluginTranslations (req: express.Request, res: express.Response) {
  const locale = req.params.locale

  if (is18nLocale(locale)) {
    const completeLocale = getCompleteLocale(locale)
    const json = PluginManager.Instance.getTranslations(completeLocale)

    return res.json(json)
  }

  return res.status(HttpStatusCode.NOT_FOUND_404).end()
}

function servePluginStaticDirectory (req: express.Request, res: express.Response) {
  const plugin: RegisteredPlugin = res.locals.registeredPlugin
  const staticEndpoint = req.params.staticEndpoint

  const [ directory, ...file ] = staticEndpoint.split('/')

  const staticPath = plugin.staticDirs[directory]
  if (!staticPath) return res.status(HttpStatusCode.NOT_FOUND_404).end()

  const filepath = file.join('/')
  return res.sendFile(join(plugin.path, staticPath, filepath), sendFileOptions)
}

function servePluginCustomRoutes (req: express.Request, res: express.Response, next: express.NextFunction) {
  const plugin: RegisteredPlugin = res.locals.registeredPlugin
  const router = PluginManager.Instance.getRouter(plugin.npmName)

  if (!router) return res.status(HttpStatusCode.NOT_FOUND_404).end()

  return router(req, res, next)
}

function servePluginClientScripts (req: express.Request, res: express.Response) {
  const plugin: RegisteredPlugin = res.locals.registeredPlugin
  const staticEndpoint = req.params.staticEndpoint

  const file = plugin.clientScripts[staticEndpoint]
  if (!file) return res.status(HttpStatusCode.NOT_FOUND_404).end()

  return res.sendFile(join(plugin.path, staticEndpoint), sendFileOptions)
}

function serveThemeCSSDirectory (req: express.Request, res: express.Response) {
  const plugin: RegisteredPlugin = res.locals.registeredPlugin
  const staticEndpoint = req.params.staticEndpoint

  if (plugin.css.includes(staticEndpoint) === false) {
    return res.status(HttpStatusCode.NOT_FOUND_404).end()
  }

  return res.sendFile(join(plugin.path, staticEndpoint), sendFileOptions)
}

function handleAuthInPlugin (req: express.Request, res: express.Response) {
  const authOptions = res.locals.externalAuth

  try {
    logger.debug('Forwarding auth plugin request in %s of plugin %s.', authOptions.authName, res.locals.registeredPlugin.npmName)
    authOptions.onAuthRequest(req, res)
  } catch (err) {
    logger.error('Forward request error in auth %s of plugin %s.', authOptions.authName, res.locals.registeredPlugin.npmName, { err })
  }
}