import Fastify from "fastify";
import { restartable } from "@fastify/restartable";
import FastifyStatic from "@fastify/static";
import Formbody from "@fastify/formbody";
import path from "path";
import fs from "fs";
import chokidar from "chokidar";
import nunjucks from "nunjucks";

export const description = "Runs your app.";

export const options = [];

export const required = [];

let CONFIGURED = false;

// nunjucks does it's own reload so let it do that
nunjucks.configure("templates", { watch: true });

const configure = async (fastify, opts) => {
  const app = fastify(opts);

  // forces reload of the modules
  const control_mod = await import(`../controllers/todo.js?update=${new Date()}`);

  // TODO: mappings are very simple for now
  for(let [url, controller] of Object.entries(control_mod.default)) {
    const handler = new controller();
    // this goes through all the allowed verbs
    for(let verb of ["get", "post", "put", "delete"]) {
      if(verb in handler) {
        app[verb](`/${url}`, async (req, rep) => {
          try {
            await handler[verb](req, rep);
          } catch(error) {
            console.error(error);
            console.error(error.stack);
            console.error(error.source);
          }
        });
      }
    }
  }

  app.register(Formbody);

  app.register(FastifyStatic, {
    root: path.join(path.resolve("."), 'static'),
    prefix: '/', // optional: default '/'
    constraints: {}, // optional: default {}
    index: "index.html"
  });

  return app;
}

const app = await await restartable(configure, { logger: true});
const host = await app.listen({port: 3000});

const reload = () => {
  if(CONFIGURED) {
    app.restart();
  }
}

export const main = async (arg, opts) => {
  try {
    chokidar.watch(["lib","commands","controllers","static","migrations","tests"])
    .on("add", path => reload())
    .on("change", path => reload())
    .on("unlink", path => reload())
    .on("ready", () => CONFIGURED = true);
  } catch(err) {
    fastify.log.error(err);
    process.exit(1);
  }
}