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// Basic equality query
query("users", "child.age == 32").then(response => {
  console.log(response.data);  // All users age 32
});

// Compound conditions
query("products", "child.price < 100 && child.category == 'electronics'")
  .then(response => {
    console.log(response.data);  // Affordable electronics
  });

// Text search with includes()
query("users", "child.bio.includes('developer')").then(response => {
  console.log(response.data);  // Users with "developer" in their bio
});

// Subscribe to all changes at a path use value@
// or subscribe to operations set@, update@ remove@
const unsubscribe = getSub("value@users.john", event => {
  console.log("User data changed:", event.data);
});

// Subscribe to updates matching a query and path
const unsubscribeQuery = querySub("update@users", "child.status == 'online'", event => {
  const onlineUsers = event.data;
  updateOnlineUsersList(onlineUsers);
});

// Only receive child nodes when data changes
const unsubscribeChanged = getSubChanged("set@activeOrders", event => {
  notifyNewOrder(event.data);
});

// Query subscription that only notifies on changes
const unsubscribeQueryChanged = querySubChanged("value@products", 
  "child.stock < 5", event => {
    alertLowStock(event.data);
  });

// Stop listening when no longer needed
unsubscribeQueryChanged();

// Execute custom server-side logic
wsFunction("addNumbers", {
  num1: 5,
  num2: 7
})
.then(response => {
  console.log(`The sum is: ${response.data}`);  // Output: The sum is: 12
});

// Upload from a file input
const fileInput = document.getElementById('profilePicture');
const file = fileInput.files[0];

setFile("users/john/profile.jpg", file).then(response => {
  showSuccess("Profile picture uploaded!");
  updateProfileImage(response.data.url);
});

// Create a trigger that runs when data changes
addFunction("onUpdate", "requests.$requestId", function(context) {
  // Check if this is a new page visit
  if (context.dataAfter && !context.dataBefore) {
    // Increment the total visit counter
    await update("stats.totalVisits", { 
      //Directly access the data file
      count: data.stats.totalVisits.count + 1 
    });
  }
});

// Define a simple addition function
addWsFunction("addNumbers", function(data, admin, sessionId, userId) {
  sum = data.num1 + data.num2;
  return sum;
});

// When a user connects
onConnection(function(userId, sessionId) {
  // Record session start time
  update(`sessions.${userId}.${sessionId}`, { 
    start: Date.now() 
  });
});

// When a user disconnects
onClose(function(userId, sessionId) {
  // Record session end time
  update(`sessions.${userId}.${sessionId}`, { 
    end: Date.now() 
  });
});