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

signal cannot_pick_item(owner_name: String)

const PICKUP_RANGE := 3.0

# §8.8 seam ⑩（CPythonTextTail::ArrangeTextTail, PythonTextTail.cpp:153-190）：多条掉落
#   名条投影到屏幕后互相挤开防重叠。参考端在屏幕像素空间跑（y 向下），poc 每物一个
#   billboard Label3D —— 把名条世界锚点投影到屏幕、按 Label3D 的真实字体度量取文本框，跑
#   text_tail_arrange.arrange_item_tails 得到每条被下推的屏幕 y，再按 Label3D 的
#   pixel_size 折回世界 y（屏幕向下 Δpx → 世界向下 Δpx*pixel_size）。
#   文本框宽 / 高取名条 Label3D 的真实字体度量（TextMetrics.label_width / label_height
#   = GetTextSize 的 w / h，1:1，增量 123 / 124；TAG_CHAR_W_PX / TAG_LINE_H_PX 仅作无字体兜底）。
#   增量 125（SetItemTextTailOwner, PythonTextTail.cpp:706-737）：有 owner 的掉落，参考端
#   owner 是与名字分开的 pOwnerTextInstance，单独 GetTextSize，令去重叠框 yEnd += ownerH + 4、
#   x 两边按 owner 半宽 ±1 外扩 —— 去重叠框把「名字」「owner + 所有格」两子串分别用 tag 的
#   字体度量后走 TextTailArrange.item_box_with_owner 合成（框度量 1:1）。
#   增量 126（SetItemTextTailOwner :712-745 + ArrangeTextTail :191-207）：owner 后缀不再拼进
#   名字串，而是 drop 节点下第二个 Label3D "owner_tag" —— CENTER 对齐、黄字 (1,1,0)、文本
#   = owner + strOwnership（:722，本地化语素为空时字面 "'s"，经 setup(possessive) 注入）；
#   owner 落在尾标基点、名字实例下移 15px（:200 pTextInstance->SetPosition(x, y + 15.0f, z)）；
#   owner 为空时删 owner_tag（:741-745）。名字色仍走 _process 远近着色（参考名字实例取
#   pInsertTextTail->Color 的道具品阶色）。
const TextTailArrange = preload("res://text_tail_arrange.gd")
const TextMetrics = preload("res://text_metrics.gd")
const TAG_BASE_Y := 0.75          # 名条相对掉落物的默认局部 y（未重叠时）
const TAG_CHAR_W_PX := 7.0        # 无字体时的每字符估宽兜底（有字体走 GetTextSize 的 w）
const TAG_LINE_H_PX := 15.0       # 无字体时的单行估高兜底（有字体走 GetTextSize 的 h）
const OWNER_POSSESSIVE := "'s"    # SetItemTextTailOwner :722 strOwnership（IDS_POSSESSIVE_MORPHENE 为空时的字面值）
const OWNER_NAME_GAP_PX := 15.0   # ArrangeTextTail :200 pTextInstance->SetPosition(x, y + 15.0f, z)：owner 行下方的名字行偏移
const DEFAULT_ITEM_COLOR := Color(1.0, 0.9, 0.5)
const ITEM_GRADE_COLORS := {
	0: Color(1.0, 1.0, 1.0),
	1: Color(0.55, 0.85, 1.0),
	2: Color(1.0, 0.85, 0.25),
	3: Color(0.85, 0.45, 1.0),
	4: Color(1.0, 0.35, 0.35),
}

var client: Node
var mount: Node3D
var proto: Node
var item_list: RefCounted
var _player_getter: Callable
var _camera_getter: Callable
var _world_getter: Callable
var _world: Node
var _by_vid := {}          # vid -> Node3D
var _next_tcp_time_ms := 0

func get_pickable_distance() -> float:
	var p: Node3D = _player_getter.call() if _player_getter.is_valid() else null
	if p and bool(p.get_meta("mounted", false)):
		return 5.0
	return PICKUP_RANGE

func _get_main_player_name() -> String:
	if client == null:
		return ""
	if client.has_method("get_main_vid") and client.has_method("get_entity"):
		var vid := int(client.get_main_vid())
		if vid > 0:
			var e: Dictionary = client.get_entity(vid)
			var n := String(e.get("name", ""))
			if n != "":
				return n
	if client.has_method("get_character_name"):
		return String(client.get_character_name())
	return ""

func _on_cannot_pick_item(owner: String) -> void:
	cannot_pick_item.emit(owner)
	print("[拾取] 这不是你的物品，无法拾取！(所有者: %s)" % owner)

func _is_rare_drop(vnum: int, d: Dictionary) -> bool:
	if vnum == 1:
		return false
	if vnum in [25040, 50513, 70024, 70031]:
		return true
	if proto and proto.has_method("item"):
		var pd: Dictionary = proto.item(vnum)
		var itype := int(pd.get("type", 0))
		if itype in [1, 2] and (vnum % 10) >= 7:
			return true
	if int(d.get("rarity", 0)) >= 2 or int(d.get("grade", 0)) >= 3:
		return true
	return false

var assets_override := ""
var _possessive := OWNER_POSSESSIVE   # setup(possessive) 注入；空 -> 字面 "'s"（SetItemTextTailOwner :722）

func setup(m2client: Node, mount_node: Node3D, player_getter: Callable,
		proto_node: Node = null, il: RefCounted = null,
		camera_getter: Callable = Callable(), possessive := "",
		world_getter: Callable = Callable()) -> void:
	client = m2client
	_possessive = possessive if possessive != "" else OWNER_POSSESSIVE   # :722 == "" ? "'s" : loc
	mount = mount_node
	proto = proto_node
	item_list = il
	_player_getter = player_getter
	_camera_getter = camera_getter
	_world_getter = world_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 _to_world_pos(raw_pos: Variant) -> Vector3:
	if not (raw_pos is Vector3):
		return Vector3.ZERO
	var pos: Vector3 = MapCoord.to_world(raw_pos)
	var w: Node = _world_getter.call() if _world_getter.is_valid() else _world
	if w and w.has_method("sample_height"):
		pos.y = float(w.call("sample_height", pos.x, pos.z)) + 0.1
	return pos

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", ""))
	var item_color := _item_color(vnum, d)
	var pos := _to_world_pos(d.get("pos", Vector3.ZERO))
	if _by_vid.has(vid):
		var existing: Node3D = _by_vid[vid]
		if is_instance_valid(existing):
			existing.position = pos
			var existing_tag := existing.get_node("tag") as Label3D
			existing_tag.text = _name_for(vnum)
			existing_tag.modulate = item_color
			existing.set_meta("item_name", existing_tag.text)
			existing.set_meta("item_owner", owner)
			existing.set_meta("item_color", item_color)
			_apply_owner_tag(existing, owner, item_color)
		return
	var node := Node3D.new()
	node.name = "drop_%d" % vid
	node.position = pos

	var root := "" if assets_override == "__none__" else (assets_override if assets_override != "" else (AssetRoot.path() if AssetRoot.available() else ""))
	var model_path := ""
	if root != "":
		if vnum == 1:
			for p in ["item/ymir work/item/etc/money.gr2", "item/etc/money.gr2"]:
				var fp := root.path_join(p)
				if FileAccess.file_exists(fp):
					model_path = fp
					break
		else:
			for p in ["item/ymir work/item/etc/item_bag.gr2", "item/etc/item_bag.gr2"]:
				var fp := root.path_join(p)
				if FileAccess.file_exists(fp):
					model_path = fp
					break

	if model_path != "" and ClassDB.class_exists("Metin2Model"):
		var model: Node3D = ClassDB.instantiate("Metin2Model")
		model.name = "model"
		model.set("flip_winding", true)
		model.set("texture_dir", model_path.get_base_dir())
		model.set("gr2_path", model_path)
		node.add_child(model)
	else:
		var mesh := MeshInstance3D.new()
		var box := BoxMesh.new()
		box.size = Vector3(0.25, 0.25, 0.25)
		mesh.mesh = box
		mesh.position.y = 0.15
		var mat := StandardMaterial3D.new()
		if vnum == 1:
			mat.albedo_color = Color(1.0, 0.85, 0.2)
			mat.metallic = 0.8
			mat.roughness = 0.2
			mat.emission_enabled = true
			mat.emission = Color(0.5, 0.4, 0.1)
		else:
			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 = _name_for(vnum)          # 名字实例只放名字，owner 走独立 owner_tag（:723 不再拼串）
	tag.position.y = TAG_BASE_Y
	tag.billboard = BaseMaterial3D.BILLBOARD_ENABLED
	tag.no_depth_test = true
	tag.pixel_size = 0.005
	tag.modulate = item_color
	node.add_child(tag)
	node.set_meta("vid", vid)
	node.set_meta("item_name", tag.text)
	node.set_meta("item_owner", owner)
	node.set_meta("item_color", item_color)
	_apply_owner_tag(node, owner, item_color)
	if _is_rare_drop(vnum, d):
		var beam := MeshInstance3D.new()
		beam.name = "light_beam"
		var cyl := CylinderMesh.new()
		cyl.top_radius = 0.08
		cyl.bottom_radius = 0.12
		cyl.height = 3.5
		beam.mesh = cyl
		beam.position.y = 1.75
		var bmat := StandardMaterial3D.new()
		bmat.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
		bmat.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
		bmat.albedo_color = Color(1.0, 0.85, 0.2, 0.45)
		bmat.emission_enabled = true
		bmat.emission = Color(1.0, 0.85, 0.3)
		beam.material_override = bmat
		node.add_child(beam)
	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)
	_arrange_tags()

# ArrangeTextTail :153-190 的 item 块：把所有掉落名条投影到屏幕，跑 isIn 去重叠，
#   再把被下推的屏幕 Δy 折回各 Label3D 的世界局部 y。无相机 / 少于 2 条时全部回默认。
func _arrange_tags() -> void:
	var cam: Camera3D = _camera_getter.call() if _camera_getter.is_valid() else null
	if cam == null:
		return
	# m_ItemTextTailList 顺序：按 vid 排序保证稳定（≈ 注册先后）。
	var vids: Array = _by_vid.keys()
	vids.sort()
	var tags: Array = []          # 与 boxes 平行：{tag, base_screen_y}
	var boxes: Array = []
	for vid in vids:
		var n: Node3D = _by_vid[vid]
		if not is_instance_valid(n):
			continue
		var tag := n.get_node_or_null("tag") as Label3D
		if tag == null:
			continue
		var anchor := n.global_position + Vector3(0, TAG_BASE_Y, 0)
		if cam.is_position_behind(anchor):
			_place_tail(n, tag, 0.0)
			continue
		var sp := cam.unproject_position(anchor)
		tags.append({"n": n, "tag": tag, "y0": sp.y})
		# 名字子串 + owner 子串分开度量（SetItemTextTailOwner 的 pOwnerTextInstance），
		#   再走 item_box_with_owner 合成去重叠框（yEnd += ownerH + 4）。
		var iname := String(n.get_meta("item_name", tag.text))
		var iowner := String(n.get_meta("item_owner", ""))
		var owner_txt := (iowner + _possessive) if iowner != "" else ""
		var nbox: Dictionary = TextTailArrange.item_box_with_owner(
			TextMetrics.string_width_like(tag, iname, TAG_CHAR_W_PX),
			TextMetrics.string_height_like(tag, iname, TAG_LINE_H_PX),
			TextMetrics.string_width_like(tag, owner_txt, TAG_CHAR_W_PX),
			TextMetrics.string_height_like(tag, owner_txt, TAG_LINE_H_PX))
		boxes.append({
			"x": sp.x, "y": sp.y,
			"w": maxf(1.0, nbox["w"]),
			"h": maxf(1.0, nbox["h"]),
		})
	if boxes.size() < 2:
		if boxes.size() == 1:
			_place_tail(tags[0]["n"], tags[0]["tag"], 0.0)
		return
	var arranged: Array = TextTailArrange.arrange_item_tails(boxes)
	for i in tags.size():
		var d_px: float = arranged[i] - float(tags[i]["y0"])   # 屏幕向下为正
		_place_tail(tags[i]["n"], tags[i]["tag"], d_px)

# ArrangeTextTail :191-207：owner 存在时 owner 实例落在尾标基点 (x, y)、名字实例下移 15px
#   （:200 pTextInstance->SetPosition(x, y + 15.0f, z)）；无 owner 时名字实例落在基点 (:206)。
#   d_px = 去重叠把该尾标下推的屏幕像素（0 = 未被推）。屏幕向下 → 世界向下（* pixel_size）。
func _place_tail(n: Node3D, tag: Label3D, d_px: float) -> void:
	var px: float = tag.pixel_size
	var owner_tag := n.get_node_or_null("owner_tag") as Label3D
	if owner_tag != null:
		owner_tag.position.y = TAG_BASE_Y - d_px * px
		tag.position.y = TAG_BASE_Y - (d_px + OWNER_NAME_GAP_PX) * px
	else:
		tag.position.y = TAG_BASE_Y - d_px * px

# 移动端情境按钮用它判断附近是否有可拾取物，避免常驻占用 HUD。
func has_nearby_item() -> bool:
	var p: Node3D = _player_getter.call() if _player_getter.is_valid() else null
	if p == null:
		return false
	var p_pos: Vector3 = p.global_position if p.is_inside_tree() else p.position
	for node in _by_vid.values():
		if not is_instance_valid(node):
			continue
		var n_pos: Vector3 = node.global_position if node.is_inside_tree() else node.position
		if p_pos.distance_to(n_pos) < PICKUP_RANGE:
			return true
	return false

# 40250 1:1 PickCloseItem: 500ms 节流 + 距离 (步行 3m / 骑马 5m) + 所有权保护预检
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 now_ms := Time.get_ticks_msec()
	if now_ms < _next_tcp_time_ms:
		return 0

	var p_pos: Vector3 = p.global_position if p.is_inside_tree() else p.position
	var best_vid := 0
	var pick_dist := get_pickable_distance()
	var best_d := pick_dist
	var best_owner := ""

	for vid in _by_vid:
		var n: Node3D = _by_vid[vid]
		if not is_instance_valid(n):
			continue
		var n_pos: Vector3 = n.global_position if n.is_inside_tree() else n.position
		var d := p_pos.distance_to(n_pos)
		if d < best_d:
			best_d = d
			best_vid = int(vid)
			best_owner = String(n.get_meta("item_owner", ""))

	if best_vid == 0:
		return 0

	var my_name := _get_main_player_name()
	if best_owner != "" and my_name != "" and best_owner != my_name:
		_on_cannot_pick_item(best_owner)
		return 0

	_next_tcp_time_ms = now_ms + 500
	if client.has_method("pickup_item"):
		client.pickup_item(best_vid)
	return best_vid

func try_pickup_vid(vid: int) -> bool:
	if client == null or not _by_vid.has(vid):
		return false
	var n: Node3D = _by_vid[vid]
	if not is_instance_valid(n):
		return false

	var now_ms := Time.get_ticks_msec()
	if now_ms < _next_tcp_time_ms:
		return false

	var best_owner := String(n.get_meta("item_owner", ""))
	var my_name := _get_main_player_name()
	if best_owner != "" and my_name != "" and best_owner != my_name:
		_on_cannot_pick_item(best_owner)
		return false

	_next_tcp_time_ms = now_ms + 500
	if client.has_method("pickup_item"):
		client.pickup_item(vid)
	return true

# Mouse hover probe used by PlayerController's cursor state. Ground drops are
# deliberately tested in screen space, so clicking a visible label / mesh
# selects PICK even when the item is not the nearest drop in world distance.
func hover_at(camera: Camera3D, screen_pos: Vector2) -> bool:
	return pick_at(camera, screen_pos) != 0

# Pick ground item at mouse screen position (40250 __Pick + __OnClickItem + CPythonTextTail::Pick).
# 同时支持点选地面模型、头顶名称标签（tag）与所有者标签（owner_tag）。
func pick_at(camera: Camera3D, screen_pos: Vector2) -> int:
	if camera == null:
		return 0
	var best_d := 64.0
	var best_vid := 0
	for vid in _by_vid:
		var node: Node3D = _by_vid[vid]
		if not is_instance_valid(node):
			continue
		if camera.is_position_behind(node.global_position):
			continue
		var test_pts: Array[Vector3] = [
			node.global_position + Vector3(0, 0.35, 0)
		]
		var tag: Node = node.get_node_or_null("tag")
		if tag is Node3D and is_instance_valid(tag):
			test_pts.append(tag.global_position)
		var otag: Node = node.get_node_or_null("owner_tag")
		if otag is Node3D and is_instance_valid(otag):
			test_pts.append(otag.global_position)
		for tp in test_pts:
			if camera.is_position_behind(tp):
				continue
			var p := camera.unproject_position(tp)
			var d := p.distance_to(screen_pos)
			if d < best_d:
				best_d = d
				best_vid = int(vid)
	return best_vid

func get_item_world_pos(vid: int) -> Variant:
	var node: Node3D = _by_vid.get(vid, null)
	if node and is_instance_valid(node):
		return node.global_position if node.is_inside_tree() else node.position
	return null

func _name_for(vnum: int) -> String:
	if vnum == 1:
		return "Yang"
	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

# SetItemTextTailOwner :712-745：owner 非空 → 一个独立的 CENTER 黄字 (1,1,0) text instance，
#   文本 = owner + strOwnership（:722/:723）；owner 为空 → 删该实例（:741-745）。
#   poc：drop 节点下第二个 Label3D "owner_tag"（渲染顺序在名字之后，:373）。
func _apply_owner_tag(node: Node3D, owner: String, item_color := DEFAULT_ITEM_COLOR) -> void:
	var owner_tag := node.get_node_or_null("owner_tag") as Label3D
	if owner.is_empty():
		if owner_tag != null:
			node.remove_child(owner_tag)
			owner_tag.queue_free()
		return
	if owner_tag == null:
		owner_tag = Label3D.new()
		owner_tag.name = "owner_tag"
		owner_tag.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER   # :727 HORIZONTAL_ALIGN_CENTER
		owner_tag.billboard = BaseMaterial3D.BILLBOARD_ENABLED
		owner_tag.no_depth_test = true
		owner_tag.pixel_size = 0.005
		owner_tag.position.y = TAG_BASE_Y
		node.add_child(owner_tag)
	owner_tag.modulate = item_color                              # :729 的 pInsertTextTail->Color
	owner_tag.text = owner + _possessive

func _item_color(vnum: int, drop: Dictionary) -> Color:
	# GC_ITEM_GROUND_ADD 只带 vnum/owner/pos；优先消费服务端或 fixture 显式携带
	# 的颜色，其次消费 item proto 的扩展字段。老数据没有品阶字段时保留旧的
	# 金色 fallback，而不会把 owner 行错误固定成纯黄。
	var pd: Dictionary = proto.item(vnum) if proto and proto.has_method("item") else {}
	for source in [drop, pd]:
		for key in ["item_color", "rarity_color", "name_color", "color"]:
			if source.has(key):
				var parsed: Variant = _coerce_color(source[key])
				if parsed != null:
					return parsed
		for key in ["item_grade", "rarity", "quality", "grade"]:
			if source.has(key):
				var grade := int(source[key])
				if ITEM_GRADE_COLORS.has(grade):
					return ITEM_GRADE_COLORS[grade]
	return DEFAULT_ITEM_COLOR

func _coerce_color(value: Variant) -> Variant:
	if value is Color:
		return value
	if value is Array and value.size() >= 3:
		var scale := 255.0 if float(value[0]) > 1.0 or float(value[1]) > 1.0 \
				or float(value[2]) > 1.0 else 1.0
		var alpha := float(value[3]) if value.size() > 3 else 1.0
		if alpha > 1.0:
			alpha /= 255.0
		return Color(float(value[0]) / scale, float(value[1]) / scale,
				float(value[2]) / scale, alpha)
	if value is Dictionary and value.has_all(["r", "g", "b"]):
		var scale := 255.0 if float(value["r"]) > 1.0 or float(value["g"]) > 1.0 \
				or float(value["b"]) > 1.0 else 1.0
		var alpha := float(value.get("a", 1.0))
		if alpha > 1.0:
			alpha /= 255.0
		return Color(float(value["r"]) / scale, float(value["g"]) / scale,
				float(value["b"]) / scale, alpha)
	if value is String and not String(value).strip_edges().is_empty():
		return Color.from_string(String(value), DEFAULT_ITEM_COLOR)
	return null