class_name ChatPanel
extends VBoxContainer

@onready var _chat_message_scene: PackedScene = preload("uid://docnx7algl78k")

@export_range(0.1, 1.0, 0.05) var auto_scroll_duration: float = 0.2
@export var message_container: VBoxContainer
@export var scroll_container: ScrollContainer
@export var message_input: LineEdit
@export var send_message_button: Button

signal message_sent(message: String)

func put_chat_message(sender: String, message: String) -> void:
	var scene: ChatMessage = _chat_message_scene.instantiate()
	scene.set_message("<{sender}> {message}".format({
		"sender": sender,
		"message": message,
	}))
	message_container.add_child(scene)
	
	# Wait a short time so that ScrollLayout receives new height because of newly added child
	await get_tree().create_timer(0.05).timeout
	_scroll_to_bottom()

func _scroll_to_bottom() -> void:
	create_tween().set_trans(Tween.TRANS_QUAD).set_ease(Tween.EASE_OUT).tween_property(scroll_container, "scroll_vertical", scroll_container.get_v_scroll_bar().max_value - scroll_container.get_v_scroll_bar().size.y, auto_scroll_duration)

func _send_chat_message() -> void:
	if message_input.text.is_empty():
		return
	
	message_sent.emit(message_input.text.strip_edges())
	message_input.text = ""

func _on_message_input_text_changed(new_text: String) -> void:
	send_message_button.disabled = new_text.is_empty()

func _on_message_input_gui_input(event: InputEvent) -> void:
	if event.is_action_pressed("send_chat_message"):
		_send_chat_message()

func _on_send_message_button_pressed() -> void:
	_send_chat_message()

func _on_web_client_connection_status_changed(new_status: WebClient.ConnectionStatus) -> void:
	if new_status == WebClient.ConnectionStatus.JOINED:
		message_input.editable = true
		send_message_button.disabled = false
	else:
		message_input.editable = false
		send_message_button.disabled = true