ip address usage

ui/ui.gd

@@ -1,14 +1,24 @@
 extends Control
 
 signal start_server
-signal connect_client
+signal connect_client(ip_address: String)
 
 @export var hide_ui_and_connect: bool
 
+const SAVE_FILE_PATH = "user://ip_settings.dat"
+
 
 func _ready():
 	if Connection.is_server(): return
 	
+	# Connect to connection events for error handling
+	var connection_node = get_node("/root/Main/Connection")
+	if connection_node:
+		connection_node.disconnected.connect(_on_connection_failed)
+	
+	# Load saved IP address
+	_load_ip_address()
+	
 	if hide_ui_and_connect:
 		connect_client_emit()
 	else:
@@ -34,7 +44,19 @@ func start_server_emit() -> void:
 
 
 func connect_client_emit() -> void:
-	connect_client.emit()
+	var ip_address = $MainMenu/MenuContainer/IPSection/IPInput.text.strip_edges()
+	if ip_address.is_empty():
+		ip_address = "localhost"
+	
+	# Basic IP validation
+	if not _is_valid_ip_or_hostname(ip_address):
+		_show_connection_error("Invalid IP address or hostname!")
+		return
+	
+	# Save IP address for next time
+	_save_ip_address(ip_address)
+	
+	connect_client.emit(ip_address)
 	hide_ui()
 
 
@@ -50,3 +72,67 @@ func hide_ui() -> void:
 func show_ui() -> void:
 	$MainMenu.visible = true
 	$InGameUI.visible = false
+
+
+func _is_valid_ip_or_hostname(address: String) -> bool:
+	if address.is_empty():
+		return false
+	
+	# Allow localhost
+	if address == "localhost":
+		return true
+	
+	# Basic hostname validation (alphanumeric, dots, hyphens)
+	var hostname_regex = RegEx.new()
+	hostname_regex.compile("^[a-zA-Z0-9.-]+$")
+	if hostname_regex.search(address):
+		return true
+	
+	# Basic IP address validation
+	var parts = address.split(".")
+	if parts.size() != 4:
+		return false
+	
+	for part in parts:
+		if not part.is_valid_int():
+			return false
+		var num = part.to_int()
+		if num < 0 or num > 255:
+			return false
+	
+	return true
+
+
+func _show_connection_error(message: String) -> void:
+	print("Connection error: " + message)
+	# Visual feedback by highlighting the IP input field
+	var ip_input = $MainMenu/MenuContainer/IPSection/IPInput
+	ip_input.modulate = Color.RED
+	
+	# Reset color after 2 seconds
+	await get_tree().create_timer(2.0).timeout
+	ip_input.modulate = Color.WHITE
+
+
+func _on_connection_failed() -> void:
+	# Show UI again if connection fails
+	if not $MainMenu.visible:
+		show_ui()
+		_show_connection_error("Failed to connect to server!")
+
+
+func _save_ip_address(ip_address: String) -> void:
+	var file = FileAccess.open(SAVE_FILE_PATH, FileAccess.WRITE)
+	if file:
+		file.store_string(ip_address)
+		file.close()
+
+
+func _load_ip_address() -> void:
+	if FileAccess.file_exists(SAVE_FILE_PATH):
+		var file = FileAccess.open(SAVE_FILE_PATH, FileAccess.READ)
+		if file:
+			var saved_ip = file.get_as_text().strip_edges()
+			file.close()
+			if not saved_ip.is_empty():
+				$MainMenu/MenuContainer/IPSection/IPInput.text = saved_ip