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";
import fg from "fast-glob";

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
  for(let mod of fg.sync("{api,pages}/*.js")) {
    const control_mod = await import(`../${mod}?update=${Date.now()}`);
    const pf = path.parse(mod);
    const url = `/${pf.name}`;

    console.log("URL IS", url);

    for(let verb of ["get", "post", "put", "delete"]) {
      const handler = control_mod[verb];

      if(handler !== undefined) {
        console.log("ADDING VERB", verb);
        app[verb](url, async (req, rep) => {
          try {
            await handler(req, rep);
          } catch(error) {
            console.error(error);
            console.error(error.stack);
            console.error(error.source);
          }
        });
      }
    }
  }

  app.register(Formbody);

  app.get("/pages/todo_alpine.html", (req, rep) => {
    const result = nunjucks.render("todo_alpine.html");
    rep.code(200).type("text/html").send(result);
  });

  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);
  }
}