import type { NextFunction, Request, Response } from "express";
import type { SessionOptions } from "express-session";
import { Liquid } from "liquidjs";
import { readFileSync, readdirSync } from "fs";
import crypto from "crypto";
import express from "express";
import expressSession from "express-session";
import path from "path";

const isProduction = process.env.NODE_ENV === "production";
const LAYOUTS_DIRECTORY = path.join(__dirname, "layouts");
const PARTIALS_DIRECTORY = path.join(__dirname, "partials");
const PUBLIC_DIRECTORY = path.join(__dirname, "public");
const VIEWS_DIRECTORY = path.join(__dirname, "views");
const cookieSecret = crypto.randomBytes(48).toString("hex");

export function startWebserver() {
    const app = express();
    app.disable("x-powered-by");

    app.use((_req, res, next) => {
      res.header("Permissions-Policy", "interest-cohort=()");
      next();
    });
    
    const noCache = (_req: Request, res: Response, next: NextFunction) => {
      res.header("Cache-Control", "no-cache");
      next();
    };

    const sessionOptions: SessionOptions = {
      secret: cookieSecret,
      name: "Session",
      resave: false,
      saveUninitialized: false,
      unset: "destroy",
      cookie: {
        maxAge: 1000 * 60 * 60 * 24 * 7,
        signed: true,
        path: "/",
        httpOnly: true,
        sameSite: "lax",
        // If you are getting infinite redirects, set this to "false" if you don't have a HTTPS-only environment setup.
          
      },
    };


    app.use(expressSession(sessionOptions));
    app.use(express.urlencoded({ extended: true, limit: "1mb" }));
    app.use(express.json({ limit: "1mb" }));

    const engine = new Liquid({
        root: [VIEWS_DIRECTORY, PARTIALS_DIRECTORY, LAYOUTS_DIRECTORY],
        cache: isProduction,
        lenientIf: true,
        jsTruthy: true,
        extname: ".liquid",
    });

    app.engine("liquid", engine.express());
    app.set("views", [VIEWS_DIRECTORY, PARTIALS_DIRECTORY, LAYOUTS_DIRECTORY]);
    app.set("view engine", "liquid");

    app.use("/public/", express.static(PUBLIC_DIRECTORY));

    // 404
    app.use((req, res) => {
        if (req.accepts("html")) return res.status(404).render("404", { url: req.url, errorCode: 404 });
        else if (req.accepts("json")) return res.status(404).send({ error: "404" });
        else res.status(404).type("txt").send("404");
    });

    app.listen(3430, "0.0.0.0", () => {
      console.log(`Webserver running on port 3430`);
    });
}