extends GraphEdit
class_name DeckRendererGraphEdit

const NODE_SCENE := preload("res://graph_node_renderer/deck_node_renderer_graph_node.tscn")
const ADD_NODE_MENU_SCENE := preload("res://graph_node_renderer/add_node_menu.tscn")

var search_popup_panel: PopupPanel
var add_node_menu: AddNodeMenu

@export var add_node_popup_size: Vector2i = Vector2i(500, 300)
var popup_position: Vector2

var deck: Deck:
	set(v):
		deck = v
		deck.node_added.connect(_on_deck_node_added)
		deck.node_removed.connect(_on_deck_node_removed)

signal group_enter_requested(group_id: String)


func _ready() -> void:
	add_node_menu = ADD_NODE_MENU_SCENE.instantiate()
	search_popup_panel = PopupPanel.new()
	search_popup_panel.add_child(add_node_menu)
	search_popup_panel.size = add_node_popup_size
	add_child(search_popup_panel, false, Node.INTERNAL_MODE_BACK)

	add_node_menu.node_selected.connect(_on_add_node_menu_node_selected)

	connection_request.connect(attempt_connection)
	disconnection_request.connect(attempt_disconnect)


func attempt_connection(from_node_name: StringName, from_port: int, to_node_name: StringName, to_port: int) -> void:
	var from_node_renderer: DeckNodeRendererGraphNode = get_node(NodePath(from_node_name))
	var to_node_renderer: DeckNodeRendererGraphNode = get_node(NodePath(to_node_name))

	#var from_output := from_node_renderer.node.get_global_port_idx_from_output(from_port)
	#var to_input := to_node_renderer.node.get_global_port_idx_from_input(to_port)

	if deck.connect_nodes(from_node_renderer.node, to_node_renderer.node, from_port, to_port):
		connect_node(
				from_node_renderer.name,
				from_port,
				to_node_renderer.name,
				to_port
			)


func attempt_disconnect(from_node_name: StringName, from_port: int, to_node_name: StringName, to_port: int) -> void:
	var from_node_renderer: DeckNodeRendererGraphNode = get_node(NodePath(from_node_name))
	var to_node_renderer: DeckNodeRendererGraphNode = get_node(NodePath(to_node_name))

	#var from_output := from_node_renderer.node.get_global_port_idx_from_output(from_port)
	#var to_input := to_node_renderer.node.get_global_port_idx_from_input(to_port)

	deck.disconnect_nodes(from_node_renderer.node, to_node_renderer.node, from_port, to_port)

	disconnect_node(
				from_node_renderer.name,
				from_port,
				to_node_renderer.name,
				to_port
			)


func get_node_renderer(node: DeckNode) -> DeckNodeRendererGraphNode:
	for i: DeckNodeRendererGraphNode in get_children().slice(1):
		if i.node == node:
			return i

	return null


func _on_scroll_offset_changed(offset: Vector2) -> void:
	deck.set_meta("offset", offset)


func initialize_from_deck() -> void:
	# TODO: wait for https://github.com/godotengine/godot/issues/85005 to get merged
	# until it is, all calls to GraphEdit#get_children will need to slice off the first element
	for i in get_children().slice(1):
		i.queue_free()

	scroll_offset = deck.get_meta("offset", Vector2())

	for node_id in deck.nodes:
		var node_renderer: DeckNodeRendererGraphNode = NODE_SCENE.instantiate()
		node_renderer.node = deck.nodes[node_id]
		add_child(node_renderer)
		node_renderer.position_offset = node_renderer.node.position_as_vector2()

	for node_id in deck.nodes:
		var node: DeckNode = deck.nodes[node_id]
		var from_node = get_children().slice(1).filter(
			func(c: DeckNodeRendererGraphNode):
				return c.node._id == node_id
		)[0]

	refresh_connections()


func refresh_connections() -> void:
	for node_id in deck.nodes:
		var node: DeckNode = deck.nodes[node_id]
		var from_node: DeckNodeRendererGraphNode = get_children().slice(1).filter(
			func(c: DeckNodeRendererGraphNode):
				return c.node._id == node_id
		)[0]

		for from_port in node.outgoing_connections:
			for connection in node.outgoing_connections[from_port]:
				var to_node_id = connection.keys()[0]
				var to_node_port = connection.values()[0]
				var to_node: DeckNodeRendererGraphNode = get_children().slice(1).filter(
					func(c: DeckNodeRendererGraphNode):
						return c.node._id == to_node_id
				)[0]
				#print("***")
				#print("calling connect_node with:")
				#print(from_node.node.name)
				#print(from_node.node.get_port_type_idx_from_global(from_port))
				#print(to_node.node.name)
				#print(to_node.node.get_port_type_idx_from_global(to_node_port))
				#print("***")
				connect_node(
					from_node.name,
					from_port,
					to_node.name,
					to_node_port
				)


func _on_deck_node_added(node: DeckNode) -> void:
	var inst: DeckNodeRendererGraphNode = NODE_SCENE.instantiate()
	inst.node = node
	add_child(inst)
	inst.position_offset = inst.node.position_as_vector2()


func _on_deck_node_removed(node: DeckNode) -> void:
	for renderer: DeckNodeRendererGraphNode in get_children().slice(1):
		if renderer.node != node:
			continue

		renderer.queue_free()
		break


func get_selected_nodes() -> Array:
	return get_children().slice(1).filter(
		func(x: DeckNodeRendererGraphNode):
			return x.selected
	)


func _gui_input(event: InputEvent) -> void:
	if event.is_action_pressed("group_nodes") && get_selected_nodes().size() > 0:
		print("?")
		clear_connections()
		var nodes = get_selected_nodes().map(
			func(x: DeckNodeRendererGraphNode):
				return x.node
		)
		deck.group_nodes(nodes)
		refresh_connections()
		get_viewport().set_input_as_handled()


func _input(event: InputEvent) -> void:
	if !has_focus():
		return

	if event.is_action_pressed("enter_group") && get_selected_nodes().size() == 1:
		if !((get_selected_nodes()[0] as DeckNodeRendererGraphNode).node.node_type == "group_node"):
			return
		print("tried to enter group")
		group_enter_requested.emit((get_selected_nodes()[0] as DeckNodeRendererGraphNode).node.group_id)
		get_viewport().set_input_as_handled()


func _on_popup_request(p_popup_position: Vector2) -> void:
	var p := get_viewport_rect().position + get_global_mouse_position()
	p += Vector2(10, 10)
	var r := Rect2i(p, search_popup_panel.size)
	search_popup_panel.popup_on_parent(r)
	add_node_menu.focus_search_bar()
	popup_position = p_popup_position


func _on_add_node_menu_node_selected(type: String) -> void:
	var node := NodeDB.instance_node(type) as DeckNode
	deck.add_node_inst(node)
	var node_pos := ((scroll_offset + popup_position) / zoom)
	if snapping_enabled:
		node_pos = node_pos.snapped(Vector2(snapping_distance, snapping_distance))

	get_node_renderer(node).position_offset = node_pos

	search_popup_panel.hide()