extends GraphEdit
class_name DeckRendererGraphEdit

## Reference to the [DeckNodeRendererGraphNode] used for later instantiation
const NODE_SCENE := preload("res://graph_node_renderer/deck_node_renderer_graph_node.tscn")
## Reference to the [AddNodeMenu] used for later instantiation
const ADD_NODE_MENU_SCENE := preload("res://graph_node_renderer/add_node_menu.tscn")

## The [PopupPanel] that holds the [AddNodeMenu] scene.
var search_popup_panel: PopupPanel
## Stores instance of [AddNodeMenu] that is used under [member search_popup_panel]
var add_node_menu: AddNodeMenu

## Used to specify the size of [member search_popup_panel].
@export var search_popup_size: Vector2i = Vector2i(500, 300)
## Stores the position of the [member search_popup_panel] for use when adding
## nodes in [method _on_add_node_menu_node_selected]
var popup_position: Vector2

## References the [Deck] that holds all the functional properties of this [DeckRendererGraphEdit]
var deck: Deck:
	set(v):
		deck = v
		deck.node_added.connect(_on_deck_node_added)
		deck.node_removed.connect(_on_deck_node_removed)

## Emits when Group creation is requested.  Ex. Hitting the "group_nodes" Hotkey.
signal group_enter_requested(group_id: String)

## Sets up the [member search_popup_panel] with an instance of [member ADD_NODE_SCENE]
## stored in [member add_node_menu].  And sets its size of [member search_popup_panel] to
## [member add_node_popup_size]
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 = search_popup_size
	add_child(search_popup_panel, false, Node.INTERNAL_MODE_BACK)

	for t: DeckType.Types in DeckType.CONVERSION_MAP:
		for out_type: DeckType.Types in DeckType.CONVERSION_MAP[t]:
			add_valid_connection_type(t, out_type)

	add_node_menu.node_selected.connect(_on_add_node_menu_node_selected)

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

## Receives [signal GraphEdit.connection_request] and attempts to create a
## connection between the two [DeckNode]s involved, utilizes [NodeDB] for accessing them.
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
			)

## Receives [signal GraphEdit.disconnection_request] and attempts to disconnect the two [DeckNode]s
## involved, utilizes [NodeDB] for accessing them.
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
			)

## Returns the associated [DeckNodeRendererGraphNode] for the supplied [DeckNode].
## Or [code]null[/code] if none is found.
func get_node_renderer(node: DeckNode) -> DeckNodeRendererGraphNode:
	for i: DeckNodeRendererGraphNode in get_children():
		if i.node == node:
			return i

	return null

## Updates [member Deck]s meta property "offset" whenever [member GraphEdit.scroll_offset]
func _on_scroll_offset_changed(offset: Vector2) -> void:
	deck.set_meta("offset", offset)

## Setups all the data from the set [member deck] in this [DeckRendererGraphEdit]
func initialize_from_deck() -> void:
	for i in get_children():
		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().filter(
			func(c: DeckNodeRendererGraphNode):
				return c.node._id == node_id
		)[0]

	refresh_connections()

## Loops through all [DeckNode]s in [member Deck.nodes] and calls
## [method GraphEdit.connect_node] for all the connections that exist in each
func refresh_connections() -> void:
	for node_id in deck.nodes:
		var node: DeckNode = deck.nodes[node_id]
		var from_node: DeckNodeRendererGraphNode = get_children().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().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
				)

## Connected to [signal Deck.node_added], used to instance the required
## [DeckNodeRendererGraphNode] and set it's [member DeckNodeRenderGraphNode.position_offset]
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()

## Connected to [signal Deck.node_added], used to remove the specified
## [DeckNodeRendererGraphNode] and queue_free it.
func _on_deck_node_removed(node: DeckNode) -> void:
	for renderer: DeckNodeRendererGraphNode in get_children():
		if renderer.node != node:
			continue

		renderer.queue_free()
		break

## Utility function that gets all [DeckNodeRenderGraphNode]s that are selected
## See [member GraphNode.selected]
func get_selected_nodes() -> Array:
	return get_children().filter(
		func(x: DeckNodeRendererGraphNode):
			return x.selected
	)

## Executes functionality based off hotkey inputs.  Specifically handles creating groups
## based off the action "group_nodes".
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()

## Handles entering groups with action "enter_group".  Done here to bypass neighbor
## functionality.
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()

## Opens [member search_popup_panel] at the mouse position.  Connected to [signal GraphEdit.popup_request]
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

## Connected to [signal AddNodeMenu.node_selected] and creates a [DeckNode] using
## [method NodeDB.instance_node].  Then placing it at the [member scroll_offset] +
## [member popup_position] / [member zoom]
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()