class_name Deck

var nodes: Dictionary

enum Types{
	ERROR = -1,
	BOOL,
	NUMERIC,
	STRING,
	ARRAY,
	DICTIONARY,
}


static var type_assoc: Dictionary = {
	Types.ERROR: DeckType.DeckTypeError,
	Types.BOOL: DeckType.DeckTypeBool,
	Types.NUMERIC: DeckType.DeckTypeNumeric,
	Types.STRING: DeckType.DeckTypeString,
	Types.ARRAY: DeckType.DeckTypeArray,
	Types.DICTIONARY: DeckType.DeckTypeDictionary,
}

var variable_stack: Dictionary = {}


func add_node(node: GDScript, meta: Dictionary = {}) -> DeckNode:
	# TODO: accept instances of DeckNode instead of instancing here?
	var uuid := UUID.v4()
	var node_inst: DeckNode = node.new() as DeckNode
	nodes[uuid] = node_inst
	node_inst._belonging_to = self
	node_inst._id = uuid

	if !meta.is_empty():
		for k in meta:
			node_inst.set_meta(k, meta[k])

	return node_inst


func add_node_inst(node: DeckNode, assign_id: String = "", assign_to_self: bool = true) -> DeckNode:
	if assign_to_self:
		node._belonging_to = self

	if assign_id == "":
		var uuid := UUID.v4()
		nodes[uuid] = node
		node._id = uuid
	else:
		nodes[assign_id] = node


#	if !meta.is_empty():
#		for k in meta:
#			node.set_meta(k, meta[k])

	return node


func get_node(uuid: String) -> DeckNode:
	return nodes.get(uuid)


func connect_nodes(from_node: DeckNode, to_node: DeckNode, from_port: int, to_port: int) -> bool:
	# first, check that we can do the type conversion.
	var type_a: Types = from_node.ports[from_port].type
	var type_b: Types = to_node.ports[to_port].type
	var err: DeckType = (type_assoc[type_b]).from(type_assoc[type_a].new())
	if err is DeckType.DeckTypeError:
		print(err.error_message)
		return false

	# TODO: prevent duplicate connections

	from_node.add_outgoing_connection(from_port, to_node._id, to_port)
	return true


func disconnect_nodes(from_node: DeckNode, to_node: DeckNode, from_port: int, to_port: int) -> void:
	var hash = {to_node._id: to_port}.hash()
	from_node.remove_outgoing_connection(from_port, hash)


func to_json(with_meta: bool = true) -> String:
	var inner := {"nodes": {}, "variable_stack": variable_stack}

	for id in nodes.keys():
		inner["nodes"][id] = nodes[id].to_dict(with_meta)

	var d := {"deck": inner}

	if with_meta:
		d["meta"] = {}
		for meta in get_meta_list():
			d["meta"][meta] = get_meta(meta)
	return JSON.stringify(d, "\t", false)


static func from_json(json: String) -> Deck:
	var data: Dictionary = JSON.parse_string(json) as Dictionary
	var deck := Deck.new()

	deck.variable_stack = data.deck.variable_stack

	for key in data.meta:
		deck.set_meta(key, data.meta[key])

	var nodes_data: Dictionary = data.deck.nodes as Dictionary

	for node_id in nodes_data:
		var node := deck.add_node_inst(NodeDB.instance_node(nodes_data[node_id].node_type), node_id, false)
		node._id = node_id
		node.name = nodes_data[node_id].name
		node._belonging_to = deck
#		node.outgoing_connections = nodes_data[node_id].outgoing_connections
#		node.incoming_connections = nodes_data[node_id].incoming_connections
		for connection_id in nodes_data[node_id].outgoing_connections:
			var connection_data = nodes_data[node_id].outgoing_connections[connection_id]
			node.outgoing_connections[int(connection_id)] = connection_data

		for connection_id in nodes_data[node_id].incoming_connections:
			var connection_data = nodes_data[node_id].incoming_connections[connection_id]
			node.incoming_connections[int(connection_id)] = connection_data

		for key in nodes_data[node_id].meta:
			node.set_meta(key, nodes_data[node_id].meta[key])

		for prop in nodes_data[node_id].props:
			node.set(prop, nodes_data[node_id].props[prop])

	return deck