extends Node
class_name ClipboardUIHelper

# Builds the Network tab content into a provided container page
static func build_network_ui(page_container: Node, engine: Node) -> void:
    ## FIX: Skip building if UI already exists. 
    ## This preserves state, prevents signal duplication, and stops the "Loading..." reset.
    if page_container.has_node("NetworkMarginWrapper"):
        return
    
    # ----------------------------------------------------
    # MAIN PAGE LAYOUT: The root wrapper for this specific tab page
    # ----------------------------------------------------
    var margin_wrapper = MarginContainer.new()
    margin_wrapper.name = "NetworkMarginWrapper"
    margin_wrapper.add_theme_constant_override("margin_left", 50)
    margin_wrapper.add_theme_constant_override("margin_top", 40)
    page_container.add_child(margin_wrapper)

    var main_stack = VBoxContainer.new()
    main_stack.add_theme_constant_override("separation", 15) 
    margin_wrapper.add_child(main_stack)

    # ----------------------------------------------------
    # ROW 1: Connection Actions
    # ----------------------------------------------------
    var row_actions = HBoxContainer.new()
    row_actions.add_theme_constant_override("separation", 15)
    main_stack.add_child(row_actions)

    var btn_server = Button.new()
    btn_server.text = "Start Server"
    btn_server.pressed.connect(func(): _on_start_server_pressed(engine))
    row_actions.add_child(btn_server)
    
    var btn_client = Button.new()
    btn_client.text = "Connect Client"
    btn_client.pressed.connect(func(): _on_start_client_pressed(engine))
    row_actions.add_child(btn_client)

    # ----------------------------------------------------
    # ROW 2: Address Info
    # ----------------------------------------------------
    var row_address = HBoxContainer.new()
    row_address.add_theme_constant_override("separation", 15)
    main_stack.add_child(row_address)

    var ip_input = LineEdit.new()
    ip_input.text = str(engine.server_ip)
    ip_input.placeholder_text = "Target Server IP"
    ip_input.custom_minimum_size = Vector2(180, 35)
    row_address.add_child(ip_input)
    
    var port_input = LineEdit.new()
    port_input.text = str(engine.port_number)
    port_input.placeholder_text = "Port"
    port_input.custom_minimum_size = Vector2(100, 35)
    row_address.add_child(port_input)

    # ----------------------------------------------------
    # ROW 3: Security & Utility
    # ----------------------------------------------------
    var row_security = HBoxContainer.new()
    row_security.add_theme_constant_override("separation", 15)
    main_stack.add_child(row_security)

    var key_input = LineEdit.new()
    key_input.text = engine.secret_key
    key_input.secret = true 
    key_input.placeholder_text = "Shared Secret Key Passphrase"
    key_input.custom_minimum_size = Vector2(300, 35)
    row_security.add_child(key_input)
    
    var btn_generate = Button.new()
    btn_generate.text = "New Key"
    btn_generate.custom_minimum_size = Vector2(0, 35)
    btn_generate.pressed.connect(func(): _on_generate_key(engine, key_input))
    row_security.add_child(btn_generate)
    
    var btn_copy = Button.new()
    btn_copy.text = "Copy Key"
    btn_copy.custom_minimum_size = Vector2(0, 35)
    btn_copy.pressed.connect(func(): engine.copy_key_to_clipboard())
    row_security.add_child(btn_copy)

    # ----------------------------------------------------
    # ROW 4: Manual Sync Input
    # ----------------------------------------------------
    var row_input = HBoxContainer.new()
    row_address.add_theme_constant_override("separation", 15)
    main_stack.add_child(row_input)
    
    var line_edit = LineEdit.new()
    line_edit.custom_minimum_size = Vector2(400, 40)
    line_edit.placeholder_text = "Type and press Enter to securely sync..."
    line_edit.text_submitted.connect(func(new_text): engine.receive_secure_clipboard(engine.encrypt_string(new_text)))
    row_input.add_child(line_edit)
    
    # ----------------------------------------------------
    # ROW 5: Status Panel
    # ----------------------------------------------------
    var row_status = HBoxContainer.new()
    row_status.add_theme_constant_override("separation", 15)
    main_stack.add_child(row_status)
    
    var status_card = PanelContainer.new()
    status_card.custom_minimum_size = Vector2(400, 80)
    status_card.size_flags_horizontal = Control.SIZE_SHRINK_BEGIN 

    var card_padding = MarginContainer.new()
    card_padding.add_theme_constant_override("margin_left", 30)
    card_padding.add_theme_constant_override("margin_right", 30)
    card_padding.add_theme_constant_override("margin_top", 15)
    card_padding.add_theme_constant_override("margin_bottom", 15)

    status_card.add_child(card_padding)
    
    var status_label = RichTextLabel.new()
    status_label.text = "Initializing..." # Temporary until first signal fires
    status_label.selection_enabled = true
    status_label.add_theme_font_size_override("font_size", 18)
    status_label.size_flags_horizontal = Control.SIZE_EXPAND_FILL
    card_padding.add_child(status_label)

    var custom_style = StyleBoxFlat.new()
    custom_style.bg_color = Color(0.13, 0.13, 0.13, 1.0)
    custom_style.set_corner_radius_all(4) 
    status_card.add_theme_stylebox_override("panel", custom_style)
    
    main_stack.add_child(status_card)

    # 🔗 Connect signal exactly ONCE when UI is built
    engine.status_changed.connect(func(new_status_text): _update_status_label(status_label, new_status_text))

# -- Static Helper Functions --

static func _on_start_server_pressed(engine: Node) -> void:
    engine.start_server(int(engine.port_number))

static func _on_start_client_pressed(engine: Node) -> void:
    engine.start_client(str(engine.server_ip), int(engine.port_number))

static func _on_generate_key(engine: Node, key_input: LineEdit) -> void:
    var new_key = engine.generate_random_key(16)
    engine.secret_key = new_key
    key_input.text = new_key

static func _update_status_label(label: RichTextLabel, text: String) -> void:
    label.text = text
    var target_color: Color = Color.GREEN
    if "Disconnected" in text or "Offline" in text:
        target_color = Color.YELLOW
    elif "Reconnecting" in text:
        target_color = Color.ORANGE
        
    label.add_theme_color_override("default_color", target_color)