const express = require("express");
const fs = require("fs");
const path = require("path");

const app = express();
const PORT = 3005;
const DATA_FILE = path.join(__dirname, "todos.json");

app.use(express.json());
app.use(express.static("public"));

// Load todos
// Load todos
function loadTodos() {
  if (!fs.existsSync(DATA_FILE)) {
    // ✅ Create file with empty array if missing
    fs.writeFileSync(DATA_FILE, "[]", "utf-8");
    return [];
  }

  const data = fs.readFileSync(DATA_FILE, "utf-8");
  if (!data.trim()) return []; // ✅ handle empty file
  try {
    return JSON.parse(data);
  } catch (err) {
    console.error("Error parsing todos.json:", err);
    return []; // fallback
  }
}

// Delete todo
app.delete("/api/todos/:id", (req, res) => {
  let todos = loadTodos();
  todos = todos.filter((todo) => todo.id != req.params.id);
  saveTodos(todos);
  res.json({ success: true });
});

// Save todos
function saveTodos(todos) {
  fs.writeFileSync(DATA_FILE, JSON.stringify(todos, null, 2));
}

// Get all todos
app.get("/api/todos", (req, res) => {
  res.json(loadTodos());
});

function formatDateTime(isoString) {
  const d = new Date(isoString);
  const date = d.toLocaleDateString(); // e.g. 8/4/2026
  const time = d.toLocaleTimeString("en-US", {
    hour: "2-digit",
    minute: "2-digit",
    second: "2-digit",
    hour12: true,
  }); // e.g. 05:30:33 PM
  return `${date} ${time}`;
}

// Add new todo
app.post("/api/todos", (req, res) => {
  const todos = loadTodos();
  const now = new Date();

  const newTodo = {
    id: Date.now(),
    text: req.body.text || "",
    // ✅ use formatted date+time
    date: req.body.date ? formatDateTime(req.body.date) : formatDateTime(now),
    title: req.body.title || "",
    status: "pending",
    private: req.body.private || false,
  };

  todos.push(newTodo);
  saveTodos(todos);
  res.json(newTodo);
});

// Update todo (status, privacy)
app.put("/api/todos/:id", (req, res) => {
  let todos = loadTodos();
  todos = todos.map((todo) =>
    todo.id == req.params.id ? { ...todo, ...req.body } : todo,
  );
  saveTodos(todos);
  res.json({ success: true });
});

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