const admin = require("firebase-admin");

const partyNameHasInvalidChar = (partyName) =>
  /\\/gi.test(partyName) || /\//gi.test(partyName) || /\./gi.test(partyName);

const isValidPin = (pin) => /^.*[0-9].{2}$/.test(pin);

module.exports = async (req, res) => {
  const bodydata = JSON.parse(req.body);
  console.log("Requested Create - UID - ", bodydata.uid);
  if (!bodydata.userName) {
    return res.status(400).send({ message: "Missing user name" });
  } else if (!bodydata.partyName) {
    return res.status(400).send({ message: "Missing party name" });
  } else if (!bodydata.partyPin) {
    return res.status(400).send({ message: "Missing party pin" });
  } else if (partyNameHasInvalidChar(bodydata.partyName)) {
    res
      .status(400)
      .send({ message: 'Party name can not have "\\" or "/" or "."' });
  } else if (!isValidPin(bodydata.partyPin)) {
    return res.status(400).send({
      message: "Party pin can only have digits and must be atleast 3 digits",
    });
  } else {
    const roomNameTaken = await admin
      .firestore()
      .collection("rooms")
      .doc(bodydata.partyName.replace("/", "\\"))
      .get()
      .then((docSnap) => docSnap.exists);
    if (roomNameTaken) {
      return res
        .status(409)
        .send({ message: "That party name is already taken" });
    } else {
      await admin
        .firestore()
        .collection("rooms")
        .doc(bodydata.partyName)
        .set({
          name: bodydata.partyName,
          pin: bodydata.partyPin,
          player: bodydata.player,
          createdAt: new Date(),
          adminUid: bodydata.uid,
          adminOnly: bodydata.adminOnly,
          publicParty: Boolean(bodydata.publicParty),
        })
        .catch((err) => {
          res.status(500).send({ message: "Unable to start party." });
          console.error(err);
        });
      await admin
        .firestore()
        .collection("rooms")
        .doc(bodydata.partyName)
        .collection("messages")
        .add({
          uid: "<system>",
          name: "",
          text: `${bodydata.userName} started the party.`,
          time: new Date(),
        })
        .catch((err) => {
          console.error(
            `Failed to add system create party message : \n\t Room: ${bodydata.partyName}`,
            err
          );
        });
      await admin
        .firestore()
        .collection("rooms")
        .doc(bodydata.partyName)
        .collection("users")
        .doc(bodydata.uid)
        .set({
          admin: true,
          name: bodydata.userName,
        })
        .catch((err) => {
          console.error(
            `Failed to set admin when creating party : \n\t Room: ${bodydata.partyName} \n\t User: ${bodydata.uid}`,
            err
          );
        });
      return res
        .status(201)
        .send({ roomId: bodydata.partyName, message: "Started a party!" });
    }
  }
  return;
};