const express = require("express");
const bodyParser = require("body-parser");
const fs = require("fs");
const path = require("path");
require("dotenv").config();

const app = express();
const PORT = 3000;
const DATA_PATH = path.join(__dirname, "data", "packages.json");
const PASSWORD = process.env.ADMIN_PASSWORD;

app.set("view engine", "ejs");
app.use(bodyParser.urlencoded({ extended: true }));
app.use(express.static("public"));
app.use((req, res, next) => {
  console.log(`[${new Date().toLocaleString()}] ${req.method} ${req.url}`);
  next();
});


// Load packages from JSON
function loadPackages() {
  if (!fs.existsSync(DATA_PATH)) return [];
  return JSON.parse(fs.readFileSync(DATA_PATH));
}

// Save packages to JSON
function savePackages(data) {
  fs.writeFileSync(DATA_PATH, JSON.stringify(data, null, 2));
}

// Format local date/time to "YYYY-MM-DD HH:mm"
function getLocalTimeString() {
  const now = new Date();
  return now.getFullYear() + "-" +
    String(now.getMonth() + 1).padStart(2, '0') + "-" +
    String(now.getDate()).padStart(2, '0') + " " +
    String(now.getHours()).padStart(2, '0') + ":" +
    String(now.getMinutes()).padStart(2, '0');
}

// Home page
app.get("/", (req, res) => {
  res.sendFile(path.join(__dirname, "public", "index.html"));
});

// Track package
app.post("/track", (req, res) => {
  const id = req.body.id?.trim();
  if (!id) return res.send("Invalid tracking ID");

  const packages = loadPackages();
  const pack = packages.find(p => p.id === id);

  if (!pack) return res.send(`<p>ID not found</p><a href="/">Back</a>`);

  const latest = pack.updates[pack.updates.length - 1];
  const history = [...pack.updates].reverse();

  res.render("track", {
    id: pack.id,
    latest,
    history,
    eta: pack.eta || "Not set"
  });
});

// Admin panel
app.get("/admin", (req, res) => {
  res.render("admin", { packages: null, error: null });
});

// Admin login
app.post("/admin", (req, res) => {
  const { password } = req.body;
  if (password !== PASSWORD) {
    return res.render("admin", { packages: null, error: "Wrong password" });
  }
  const packages = loadPackages();
  res.render("admin", { packages, error: null });
});

// Handle update
app.post("/update", (req, res) => {
  const { id, progress, status, eta, password } = req.body;
  if (password !== PASSWORD) return res.send("Invalid password");

  const update = {
    progress: parseInt(progress),
    status,
    time: getLocalTimeString()
  };

  const packages = loadPackages();
  const pack = packages.find(p => p.id === id);

  if (pack) {
    pack.updates.push(update);
    if (eta) pack.eta = eta;
  } else {
    const newPackage = {
      id,
      updates: [update],
      eta: eta || ""
    };
    packages.push(newPackage);
  }

  savePackages(packages);
  res.redirect("/admin");
});

app.listen(PORT, () => {
  console.log(`🚀 Courier tracker running at http://localhost:${PORT}`);
});