import { WebConfig } from "./config";
import * as express from "express"
import { Express } from "express"

import Logging from "@hibas123/nodelogging"

import * as bodyparser from "body-parser";
import * as cookieparser from "cookie-parser"

import * as i18n from "i18n"
import * as compression from "compression";
import { BADHINTS } from "dns";
import ApiRouter from "./api/api";
import ViewRouter from "./views/views";
import RequestError, { HttpStatusCode } from "./helper/request_error";

export default class Web {
   server: Express
   private port: number

   constructor(config: WebConfig) {
      this.server = express()
      this.port = Number(config.port);
      this.registerMiddleware()
      this.registerEndpoints()
      this.registerErrorHandler()
   }

   listen() {
      this.server.listen(this.port, () => {
         Logging.log(`Server listening on port ${this.port}`)
      })
   }

   private registerMiddleware() {
      this.server.use(cookieparser())
      this.server.use(bodyparser.json(), bodyparser.urlencoded({ extended: true }))
      this.server.use(i18n.init)

      //Logging Middleware
      this.server.use((req, res, next) => {
         let start = process.hrtime()
         let finished = false;
         let to = false;
         let listener = () => {
            if (finished) return;
            finished = true;
            let td = process.hrtime(start);
            let time = !to ? (td[0] * 1e3 + td[1] / 1e6).toFixed(2) : "--.--";
            let resColor = "";
            if (res.statusCode >= 200 && res.statusCode < 300) resColor = "\x1b[32m" //Green
            else if (res.statusCode === 304 || res.statusCode === 302) resColor = "\x1b[33m"
            else if (res.statusCode >= 400 && res.statusCode < 500) resColor = "\x1b[36m" //Cyan
            else if (res.statusCode >= 500 && res.statusCode < 600) resColor = "\x1b[31m" //Red
            let m = req.method;
            while (m.length < 4) m += " ";
            Logging.log(`${m} ${req.originalUrl} ${req.language} ${resColor}${res.statusCode}\x1b[0m - ${time}ms`)
            res.removeListener("finish", listener)
         }
         res.on("finish", listener)
         setTimeout(() => {
            to = true;
            listener();
         }, 2000)
         next()
      })

      function shouldCompress(req, res) {
         if (req.headers['x-no-compression']) {
            // don't compress responses with this request header
            return false
         }

         // fallback to standard filter function
         return compression.filter(req, res)
      }
      this.server.use(compression({ filter: shouldCompress }))
   }

   private registerEndpoints() {
      this.server.use("/api", ApiRouter);
      this.server.use("/", ViewRouter)
   }

   private registerErrorHandler() {
      this.server.use((error, req: express.Request, res, next) => {
         if (!(error instanceof RequestError)) {
            Logging.error(error);
            error = new RequestError(error.message, HttpStatusCode.INTERNAL_SERVER_ERROR);
         } else if (error.status === 500 && !(<any>error).nolog) {
            Logging.error(error);
         } else {
            Logging.log(typeof error.message === "string" ? error.message.split("\n", 1)[0] : error.message);
         }

         if (req.accepts(["json"])) {
            res.json_status = error.status || 500;
            res.json({ error: error.message, status: error.status || 500 })
         } else
            res.status(error.status || 500).send(error.message)
      })
   }
}