import express from 'express';
import { createProxyMiddleware } from 'http-proxy-middleware';

import config from "../eventmapper_config.json" with { type: "json" };

const app = express();

app.use("/assets", express.static('assets'));

app.use("/", express.static('pages'));

app.use("/dataServer", express.static('data')); // Example data file-server
app.use("/fileServer", express.static('files')); // Example file file-server

app.use("/files", createProxyMiddleware({
  target: config.files_url
}));

app.get('/data/:lang/events/:floor', async (req, res) => {
  // Get events
  let eventsReq = await fetch(new URL(`./events/${req.params.floor}.json`, config.data_url));
  let events;
  if (eventsReq.ok)
    events = await eventsReq.json();
  else
    return res.status(400).send("Bad Request");

  // Merge events and localization
  const lang = req.params.lang;
  const merged = events.map(event => {
    const curLang = event.lang[lang] ?? event.lang[config.default_language];

    event.name = curLang.name ?? "";
    event.description = curLang.description ?? "";
    if (curLang.host != null)
      event.host = curLang.host;
    
    delete event.lang;
    return event;
  });

  return res.send(merged);
})

app.get('/data/:lang/events/', async (req, res) => {
  // Get floors
  let floorsReq = await fetch(new URL("./floors.json", config.data_url));
  let floors;
  if (floorsReq.ok)
    floors = await floorsReq.json();
  else
    return res.status(400).send("Bad Request");
  
  let allEvents = [];
  
  await Promise.allSettled(floors.map(async (curFloor) => {
    let eventsReq = await fetch(new URL(`./events/${curFloor.id}.json`, config.data_url));
    let events;
    if (eventsReq.ok)
      events = await eventsReq.json();
    else
      return null;

    allEvents = allEvents.concat(events);
  }));

  // Merge events and localization
  const lang = req.params.lang;
  const merged = allEvents.map(event => {
    const curLang = event.lang[lang] ?? event.lang[config.default_language];

    event.name = curLang.name ?? "";
    event.description = curLang.description ?? "";
    if (curLang.host != null)
      event.host = curLang.host;

    delete event.lang;
    return event;
  });

  return res.send(merged);
})

app.get('/data/:lang/floors', async (req, res) => {
  // Get floors
  let floorsReq = await fetch(new URL("./floors.json", config.data_url));
  let floors;
  if (floorsReq.ok)
    floors = await floorsReq.json();
  else
    return res.status(400).send("Bad Request");

  // Merge floors and localization
  const lang = req.params.lang;
  const merged = floors.map(floor => {
    const curLang = floor.lang[lang] ?? floor.lang[config.default_language];

    floor.name = curLang.name ?? "";
    floor.shortName = curLang.shortName ?? "";
    floor.description = curLang.description ?? "";
    delete floor.lang;
    return floor;
  });

  return res.send(merged);
})

app.get('/data/:lang/tags', async (req, res) => {
  // Get tags
  let tagsReq = await fetch(new URL("tags.json", config.data_url));
  let tags;
  if (tagsReq.ok)
  tags = await tagsReq.json();
  else
    return res.status(400).send("Bad Request");

  // Merge floors and localization
  const lang = req.params.lang;
  const merged = tags.map(tag => {
    const curLang = tag.lang[lang] ?? tag.lang[config.default_language];

    tag.name = curLang.name ?? "";
    tag.shortName = curLang.shortName ?? "";
    tag.description = curLang.description ?? "";
    delete tag.lang;
    return tag;
  });

  return res.send(merged);
})

app.get('/data/:lang/rooms/:floor', async (req, res) => {
  // Get rooms
  let roomsReq = await fetch(new URL(`rooms/${req.params.floor}.json`, config.data_url));
  let rooms;
  if (roomsReq.ok)
    rooms = await roomsReq.json();
  else
    return res.status(400).send("Bad Request");

  // Merge rooms and localization
  const lang = req.params.lang;
  const merged = rooms.map(room => {
    const curLang = room.lang[lang] ?? room.lang[config.default_language];

    room.name = curLang.name ?? "";
    room.shortName = curLang.shortName ?? "";
    room.description = curLang.description ?? "";
    delete room.lang;
    return room;
  });

  return res.send(merged);
})

app.listen(config.port, () => {
  const listeningURL = new URL("http://localhost/");
  listeningURL.port = config.port;
  console.log(`Example app listening on ${listeningURL.toString()}`)
})

export default app;