import cors from "cors";
import express from "express";
import path from "path";
import { fileURLToPath } from "url";
import { connectToDatabase } from "./db.js";
import { config } from "./config.js";
import { MenuItem } from "./models/MenuItem.js";
import { Order } from "./models/Order.js";
import {
  computeOrderTotal,
  ensureSeedMenu,
  getSettings,
  nextOrderNumber,
  resetMenuToDefaults
} from "./services.js";

const app = express();
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const clientDist = path.resolve(__dirname, "../client/dist");

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

app.get("/api/health", (_request, response) => {
  response.json({ ok: true });
});

app.get("/api/bootstrap", async (_request, response, next) => {
  try {
    await ensureSeedMenu();
    const [menu, orders] = await Promise.all([
      MenuItem.find().sort({ category: 1, name: 1 }),
      Order.find({ status: { $ne: "completed" } }).sort({ createdAt: -1 })
    ]);
    response.json({
      menu,
      orders,
      settings: getSettings()
    });
  } catch (error) {
    next(error);
  }
});

app.post("/api/menu", async (request, response, next) => {
  try {
    const { name, category, description = "", basePrice } = request.body;
    if (!name || !category || typeof basePrice !== "number" || Number.isNaN(basePrice)) {
      return response.status(400).json({ error: "Invalid menu item payload." });
    }
    const menuItem = await MenuItem.create({ name, category, description, basePrice });
    response.status(201).json({ menuItem });
  } catch (error) {
    next(error);
  }
});

app.delete("/api/menu/:menuItemId", async (request, response, next) => {
  try {
    await MenuItem.findByIdAndDelete(request.params.menuItemId);
    response.json({ ok: true });
  } catch (error) {
    next(error);
  }
});

app.post("/api/menu/reset", async (_request, response, next) => {
  try {
    const menu = await resetMenuToDefaults();
    response.json({ menu });
  } catch (error) {
    next(error);
  }
});

app.post("/api/orders", async (request, response, next) => {
  try {
    const { customerName = "", paymentMethod = "cash", lines } = request.body;
    if (!Array.isArray(lines) || lines.length === 0) {
      return response.status(400).json({ error: "Orders require at least one line item." });
    }
    const total = computeOrderTotal(lines);
    const order = await Order.create({
      number: await nextOrderNumber(),
      customerName,
      paymentMethod,
      lines,
      total
    });
    response.status(201).json({ order });
  } catch (error) {
    next(error);
  }
});

app.patch("/api/orders/:orderId/status", async (request, response, next) => {
  try {
    const { status } = request.body;
    const order = await Order.findByIdAndUpdate(
      request.params.orderId,
      { status },
      { new: true, runValidators: true }
    );
    response.json({ order });
  } catch (error) {
    next(error);
  }
});

app.delete("/api/orders/:orderId", async (request, response, next) => {
  try {
    await Order.findByIdAndDelete(request.params.orderId);
    response.json({ ok: true });
  } catch (error) {
    next(error);
  }
});

app.use(express.static(clientDist));

app.get("*", (request, response, next) => {
  if (request.path.startsWith("/api/")) {
    return next();
  }
  response.sendFile(path.join(clientDist, "index.html"));
});

app.use((error, _request, response, _next) => {
  console.error(error);
  response.status(500).json({ error: error.message || "Internal server error" });
});

connectToDatabase()
  .then(() => {
    app.listen(config.port, () => {
      console.log(`Ranaze POS server listening on port ${config.port}`);
    });
  })
  .catch((error) => {
    console.error("Failed to connect to MongoDB", error);
    process.exit(1);
  });