import express from "express";
import cors from "cors";
import dotenv from "dotenv";
dotenv.config();

const app = express();

// Middleware
app.use(cors());
app.use(express.json());

// =========================
// ROOT (optional)
// =========================
app.get("/", (req, res) => {
  res.send("Encore API is running");
});

// =========================
// TICKETMASTER EVENTS (PROXY)
// =========================
const TM_API_KEY = process.env.TM_API_KEY;

app.get("/api/events", async (req, res) => {

  const city = req.query.city;

  if (!city) {
    return res.status(400).json({ message: "City is required" });
  }

  try {
    const url = `https://app.ticketmaster.com/discovery/v2/events.json?apikey=${TM_API_KEY}&city=${city}`;

    const response = await fetch(url);
    const data = await response.json();

    res.json(data);

  } catch (error) {
    console.error("Event fetch error:", error);
    res.status(500).json({ message: "Error fetching events" });
  }
});

// =========================
// INVITATIONS SYSTEM
// =========================
let invitations = [];
let idCounter = 1;

// SEND INVITATION
app.post("/api/invitation", (req, res) => {

    if (!req.body) {
      return res.status(400).json({ message: "Missing request body" });
    }
  
    const fromUser = req.header("X-Username");
    const { toUser, eventId, eventName } = req.body;
  
    if (!fromUser || !toUser) {
      return res.status(400).json({ message: "Missing users" });
    }
  
    const invitation = {
      id: idCounter++,
      fromUser,
      toUser,
      eventId,
      eventName,
      status: "pending"
    };
  
    invitations.push(invitation);
  
    res.json(invitation);
  });

// GET INVITATIONS FOR USER
app.get("/api/invitation", (req, res) => {

  const user = req.header("X-Username");

  if (!user) {
    return res.status(400).json({ message: "Missing username" });
  }

  const userInvitations = invitations.filter(
    inv => inv.toUser === user
  );

  res.json(userInvitations);
});

// ACCEPT INVITATION
app.post("/api/invitation/:id/accept", (req, res) => {

  const inv = invitations.find(i => i.id == req.params.id);

  if (!inv) {
    return res.status(404).json({ message: "Invitation not found" });
  }

  inv.status = "accepted";

  res.json(inv);
});

// DECLINE INVITATION
app.post("/api/invitation/:id/decline", (req, res) => {

  const inv = invitations.find(i => i.id == req.params.id);

  if (!inv) {
    return res.status(404).json({ message: "Invitation not found" });
  }

  inv.status = "declined";

  res.json(inv);
});

// =========================
// START SERVER
// =========================
app.listen(3000, () => {
  console.log("Server running on http://localhost:3000");
});