/*
Copyright (C) 2019  Cloudbase Solutions SRL
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

import express from "express";
import path from "path";
import fs from "fs";
import requireWithoutCache from "require-without-cache";

import type { Services } from "@src/@types/Config";

const getBaseUrl = () => {
  const BASE_URL = process.env.CORIOLIS_URL || "";
  return BASE_URL.trim().replace(/\/$/, "");
};

const modServicesUrls = (
  configServices: Services,
  servicesMod?: Services
): Services => {
  const services = { ...configServices };

  Object.keys(services).forEach(key => {
    const typedKey = key as keyof Services;
    services[typedKey] = (
      servicesMod && servicesMod[typedKey]
        ? servicesMod[typedKey]
        : services[typedKey]
    ).replace("{BASE_URL}", getBaseUrl());
  });
  return services;
};

const NOT_FIRST_LAUNCH_PATH = path.join(__dirname, "../../.not-first-launch");

export default (router: express.Router) => {
  router
    .get("/config", (_, res) => {
      const configPath = path.join(__dirname, "../../config.ts");
      const isFirstLaunch = !fs.existsSync(NOT_FIRST_LAUNCH_PATH);
      const config: any = requireWithoutCache(configPath, require).config;
      const modJsonPath: string | null | undefined = process.env.MOD_JSON;
      if (!modJsonPath) {
        config.servicesUrls = modServicesUrls(config.servicesUrls);
        res.send({ config, isFirstLaunch });
        return;
      }
      try {
        const jsonContent: any = fs.readFileSync(modJsonPath);
        const configMod = JSON.parse(jsonContent).config;
        Object.keys(configMod).forEach(key => {
          if (key !== "servicesUrls") {
            config[key] = configMod[key];
          }
        });
        config.servicesUrls = modServicesUrls(
          config.servicesUrls,
          configMod.servicesUrls
        );
        res.send({ config, isFirstLaunch });
      } catch (err) {
        console.error(err);
        res.status(400).json({ error: { message: "Invalid MOD_JSON file" } });
      }
    })
    .post("/config/first-launch", (req, res) => {
      const { isFirstLaunch } = req.body;
      if (isFirstLaunch !== false) {
        res.status(422).json({
          error: { message: "'isFirstLaunch' property not set to 'false'" },
        });
        return;
      }
      fs.writeFileSync(NOT_FIRST_LAUNCH_PATH, "");
      res.json({ isFirstLaunch });
    });
};