mtgodot-poc/project/ui/ground_items.gd

# GroundItems (P2) —— 世界里的掉落物：GC_ITEM_GROUND_ADD/DEL → 小物体 + 名条 + 拾取。
#
#   var gi := preload("res://ui/ground_items.gd").new()
#   add_child(gi)
#   gi.setup(m2client, mount_node, player_getter, proto, item_list)
#   # 按拾取键时： gi.try_pickup()   -> 捡最近的一个（<PICKUP_RANGE m）
#
# M2Client.ground_item_added(Dict{vid,vnum,pos,owner}) / ground_item_removed(vid) 驱动。
extends Node

const PICKUP_RANGE := 3.0

var client: Node
var mount: Node3D
var proto: Node
var item_list: RefCounted
var _player_getter: Callable
var _by_vid := {}          # vid -> Node3D

func setup(m2client: Node, mount_node: Node3D, player_getter: Callable,
		proto_node: Node = null, il: RefCounted = null) -> void:
	client = m2client
	mount = mount_node
	proto = proto_node
	item_list = il
	_player_getter = player_getter
	if client.has_signal("ground_item_added"):
		client.ground_item_added.connect(_on_added)
	if client.has_signal("ground_item_removed"):
		client.ground_item_removed.connect(_on_removed)
	# 已在场的（重连）
	if client.has_method("get_ground_items"):
		for d in client.get_ground_items():
			_on_added(d)

func _on_added(d: Dictionary) -> void:
	var vid := int(d.get("vid", 0))
	if vid == 0:
		return
	var vnum := int(d.get("vnum", 0))
	var owner := String(d.get("owner", ""))
	if _by_vid.has(vid):
		var existing: Node3D = _by_vid[vid]
		if is_instance_valid(existing):
			(existing.get_node("tag") as Label3D).text = _tag_text(vnum, owner)
		return
	var node := Node3D.new()
	node.name = "drop_%d" % vid
	node.position = d.get("pos", Vector3.ZERO)
	var mesh := MeshInstance3D.new()
	var box := BoxMesh.new()
	box.size = Vector3(0.25, 0.25, 0.25)
	mesh.mesh = box
	mesh.position.y = 0.3
	var mat := StandardMaterial3D.new()
	mat.albedo_color = Color(1.0, 0.85, 0.3)
	mat.emission_enabled = true
	mat.emission = Color(0.6, 0.5, 0.1)
	mesh.material_override = mat
	node.add_child(mesh)
	var tag := Label3D.new()
	tag.name = "tag"
	tag.text = _tag_text(vnum, owner)
	tag.position.y = 0.75
	tag.billboard = BaseMaterial3D.BILLBOARD_ENABLED
	tag.no_depth_test = true
	tag.pixel_size = 0.005
	tag.modulate = Color(1.0, 0.9, 0.5)
	node.add_child(tag)
	node.set_meta("vid", vid)
	mount.add_child(node)
	_by_vid[vid] = node

func _on_removed(vid: int) -> void:
	var n: Node3D = _by_vid.get(vid, null)
	if n:
		_by_vid.erase(vid)
		n.queue_free()

func clear_for_map_change() -> void:
	for vid in _by_vid.keys():
		var node: Node3D = _by_vid[vid]
		if is_instance_valid(node):
			node.queue_free()
	_by_vid.clear()

func _process(dt: float) -> void:
	var p: Node3D = _player_getter.call() if _player_getter.is_valid() else null
	if p == null:
		return
	var t := Time.get_ticks_msec() / 1000.0
	for vid in _by_vid:
		var n: Node3D = _by_vid[vid]
		if is_instance_valid(n):
			var m := n.get_child(0) as MeshInstance3D
			if m:
				m.rotation.y = t * 2.0
			# 近了名条高亮
			var near := p.global_position.distance_to(n.global_position) <= PICKUP_RANGE
			(n.get_node("tag") as Label3D).modulate = Color(0.4, 1.0, 0.4) if near else Color(1.0, 0.9, 0.5)

# 捡最近的一个（范围内）。返回捡的 vid，0 = 没有。
func try_pickup() -> int:
	var p: Node3D = _player_getter.call() if _player_getter.is_valid() else null
	if p == null or client == null:
		return 0
	var best_vid := 0
	var best_d := PICKUP_RANGE
	for vid in _by_vid:
		var n: Node3D = _by_vid[vid]
		if not is_instance_valid(n):
			continue
		var d := p.global_position.distance_to(n.global_position)
		if d < best_d:
			best_d = d
			best_vid = int(vid)
	if best_vid != 0:
		client.pickup_item(best_vid)
	return best_vid

func _name_for(vnum: int) -> String:
	if proto:
		var pd: Dictionary = proto.item(vnum)
		if not pd.is_empty():
			return String(pd.get("locale_name", pd.get("name", "item %d" % vnum)))
	if item_list and item_list.has(vnum):
		return item_list.type_of(vnum)
	return "item %d" % vnum

func _tag_text(vnum: int, owner: String) -> String:
	var text := _name_for(vnum)
	return "%s (%s)" % [text, owner] if not owner.is_empty() else text