# Quickbar (P6) —— 快捷栏：36 槽（4 页 × 9 格），数字键 1-9 施放技能 / 用物品。
#
#   var qb := preload("res://ui/quickbar.gd").new()
#   add_child(qb)
#   qb.setup(m2client, skill_table, canvas_parent, player_getter)
#   qb.assign(0, "skill", 1)          # 当前页 0 号格放技能 id 1
#   qb.assign(1, "item", 5)           # 当前页 1 号格放背包 5 格的药水
#   # 输入： game_scene 里 KEY_1..KEY_9 -> qb.activate(n)，F1..F4 切页
#
# 技能施放：先发送 M2Client.use_skill(skill_id, target_vid)，再同步
# M2Client.cast_skill(motion_idx, heading, x_cm, y_cm)（朝向 = 玩家 yaw）。
# 冷却：本地预测时长由 SkillTable 提供；GC_SKILL_COOLTIME_END 可提前解锁。
extends Node

signal skill_activated(skill_id: int)   # game_scene 接它播技能特效

const CM := 100.0
const DEFAULT_CD := 2.0
const SLOTS_PER_PAGE := 9
const PAGE_COUNT := 4
const SLOT_COUNT := SLOTS_PER_PAGE * PAGE_COUNT

var client: Node
var table: RefCounted        # SkillTable
var _player_getter: Callable
var _root: Control
var _slots := []             # 当前页 UI：[{btn, cd, lbl}]
var _state := []             # 36 个服务端槽：[{kind, id, cd_end:float}]
var _page := 0
var _move_from := -1

func setup(m2client: Node, skill_table: RefCounted, parent: Node, player_getter: Callable) -> void:
	client = m2client
	table = skill_table
	_player_getter = player_getter
	for _i in SLOT_COUNT:
		_state.append({"kind": "", "id": 0, "cd_end": 0.0})
	_build(parent)
	if client.has_signal("skill_cooldown_end"):
		client.skill_cooldown_end.connect(_on_cd_end)
	if client.has_signal("quickslots_changed"):
		client.quickslots_changed.connect(restore_from_server)
		restore_from_server()

# 从服务器 GC_QUICKSLOT_* 恢复全部 36 个快捷栏槽位。
# 服务器 type：1 道具 / 2 技能 / 3 命令 / 4 表情；ref = 道具格 / 技能 id。
func restore_from_server() -> void:
	if client == null or not client.has_method("get_quickslots"):
		return
	var restored := []
	for _i in SLOT_COUNT:
		restored.append({"kind": "", "id": 0, "cd_end": 0.0})
	for qs in client.get_quickslots():
		var pos := int(qs.get("pos", -1))
		if pos < 0 or pos >= SLOT_COUNT:
			continue
		match int(qs.get("type", 0)):
			1: restored[pos] = {"kind": "item", "id": int(qs.get("ref", 0)), "cd_end": 0.0}
			2: restored[pos] = {"kind": "skill", "id": int(qs.get("ref", 0)), "cd_end": 0.0}
	_state = restored
	_refresh_page()

func assign(slot: int, kind: String, id: int, persist := true) -> void:
	if slot < 0 or slot >= SLOTS_PER_PAGE:
		return
	var global := _global_slot(slot)
	_state[global] = {"kind": kind, "id": id, "cd_end": 0.0}
	if persist and client and client.has_method("quickslot_add"):
		var type := 2 if kind == "skill" else 1 if kind == "item" else 0
		if type == 0 or not client.quickslot_add(global, type, id):
			return
	_refresh_slot(slot)

func activate(slot: int) -> void:
	if slot < 0 or slot >= SLOTS_PER_PAGE:
		return
	var global := _global_slot(slot)
	var s: Dictionary = _state[global]
	if s.kind == "" or s.id == 0:
		return
	if _now() < s.cd_end:
		return
	if s.kind == "skill":
		var mi: int = table.motion_idx_of(s.id) if table else 0
		var p: Node3D = _player_getter.call() if _player_getter.is_valid() else null
		var yaw := 0.0
		var xy := Vector2.ZERO
		if p:
			yaw = fposmod(90.0 - rad_to_deg(p.rotation.y), 360.0)
			xy = Vector2(p.position.x * CM, -p.position.z * CM)
		var target_vid := 0
		if client.has_method("get_target"):
			target_vid = int(client.get_target().get("vid", 0))
		# use_skill is the authoritative server intent. Keep the CG_MOVE skill
		# state packet as a separate visual/action-state sync, just like the
		# original client did.
		var intent_sent := true
		if client.has_method("use_skill"):
			intent_sent = client.use_skill(int(s.id), target_vid)
		if intent_sent and client.cast_skill(mi, yaw, int(xy.x), int(xy.y)):
			s.cd_end = _now() + _skill_cooldown(int(s.id))
			_state[global] = s
			skill_activated.emit(int(s.id))
	elif s.kind == "item":
		client.use_item(1, s.id)   # WINDOW_INVENTORY

func set_page(page: int) -> void:
	if page < 0 or page >= PAGE_COUNT or page == _page:
		return
	_page = page
	_move_from = -1
	_refresh_page()

func _global_slot(local_slot: int) -> int:
	return _page * SLOTS_PER_PAGE + local_slot

func _clear(slot: int) -> void:
	if slot < 0 or slot >= SLOTS_PER_PAGE:
		return
	var global := _global_slot(slot)
	if _state[global].kind == "":
		return
	if client and client.has_method("quickslot_del") and not client.quickslot_del(global):
		return
	_state[global] = {"kind": "", "id": 0, "cd_end": 0.0}
	_refresh_slot(slot)

func _swap(local_a: int, local_b: int) -> void:
	var a := _global_slot(local_a)
	var b := _global_slot(local_b)
	if client and client.has_method("quickslot_swap") and not client.quickslot_swap(a, b):
		return
	var tmp: Dictionary = _state[a]
	_state[a] = _state[b]
	_state[b] = tmp
	_refresh_slot(local_a)
	_refresh_slot(local_b)

# --- UI ---------------------------------------------------------------

func _build(parent: Node) -> void:
	_root = Control.new()
	_root.set_anchors_preset(Control.PRESET_CENTER_BOTTOM)
	_root.position = Vector2(-9 * 23, -54)
	parent.add_child(_root)
	var prev := Button.new()
	prev.text = "‹"
	prev.position = Vector2(-24, 7)
	prev.pressed.connect(func(): set_page(posmod(_page - 1, PAGE_COUNT)))
	_root.add_child(prev)
	var next := Button.new()
	next.text = "›"
	next.position = Vector2(9 * 44 + 2, 7)
	next.pressed.connect(func(): set_page(posmod(_page + 1, PAGE_COUNT)))
	_root.add_child(next)
	var page_label := Label.new()
	page_label.name = "page"
	page_label.position = Vector2(9 * 44 + 7, 38)
	page_label.add_theme_font_size_override("font_size", 9)
	_root.add_child(page_label)
	var row := HBoxContainer.new()
	row.add_theme_constant_override("separation", 4)
	_root.add_child(row)
	for i in SLOTS_PER_PAGE:
		var slot := Panel.new()
		slot.custom_minimum_size = Vector2(40, 40)
		var sb := StyleBoxFlat.new()
		sb.bg_color = Color(0.1, 0.11, 0.14, 0.9)
		sb.border_color = Color(0.35, 0.32, 0.26)
		sb.set_border_width_all(1)
		slot.add_theme_stylebox_override("panel", sb)
		var num := Label.new()
		num.text = str(i + 1)
		num.position = Vector2(3, 1)
		num.add_theme_font_size_override("font_size", 10)
		slot.add_child(num)
		var lbl := Label.new()
		lbl.name = "lbl"
		lbl.position = Vector2(3, 15)
		lbl.add_theme_font_size_override("font_size", 9)
		slot.add_child(lbl)
		var cd := ColorRect.new()
		cd.name = "cd"
		cd.color = Color(0, 0, 0, 0.55)
		cd.set_anchors_preset(Control.PRESET_FULL_RECT)
		cd.visible = false
		slot.add_child(cd)
		var idx := i
		slot.gui_input.connect(func(e: InputEvent):
			if e is InputEventMouseButton and e.pressed:
				if e.button_index == MOUSE_BUTTON_LEFT:
					_try_drop(idx)
				elif e.button_index == MOUSE_BUTTON_RIGHT:
					_clear(idx))
		row.add_child(slot)
		_slots.append({"btn": slot, "cd": cd, "lbl": lbl})
	_refresh_page()

func _try_drop(slot: int) -> void:
	# skill_ui 把待拖技能放在 drag_skill_id；这里落点接
	var sk_ui := _find_skill_ui()
	if sk_ui and sk_ui.drag_skill_id != 0:
		assign(slot, "skill", sk_ui.drag_skill_id)
		sk_ui.drag_skill_id = 0
		_move_from = -1
		return
	if _move_from >= 0 and _move_from != slot:
		_swap(_move_from, slot)
		_move_from = -1
		return
	if _state[_global_slot(slot)].kind != "":
		_move_from = slot

func _find_skill_ui() -> Node:
	var tree := get_tree()
	if tree == null or tree.root == null:
		return null
	for n in tree.root.find_children("*", "Node", true, false):
		if n.get_script() and n.has_method("set_job") and "drag_skill_id" in n:
			return n
	return null

func _refresh_slot(slot: int) -> void:
	if slot < 0 or slot >= _slots.size():
		return
	var s: Dictionary = _state[_global_slot(slot)]
	var txt := ""
	if s.kind == "skill" and table:
		txt = table.name_of(s.id).substr(0, 5)
	elif s.kind == "item":
		txt = "#%d" % s.id
	_slots[slot].lbl.text = txt

func _refresh_page() -> void:
	if _root and _root.has_node("page"):
		_root.get_node("page").text = "F%d" % (_page + 1)
	for slot in _slots.size():
		_refresh_slot(slot)

func _on_cd_end(skill_id: int) -> void:
	for i in _state.size():
		var s: Dictionary = _state[i]
		if s.kind == "skill" and s.id == skill_id:
			s.cd_end = 0.0
			_state[i] = s

func _process(_dt: float) -> void:
	var t := _now()
	for slot in _slots.size():
		var s: Dictionary = _state[_global_slot(slot)]
		var on_cd: bool = t < s.cd_end
		_slots[slot].cd.visible = on_cd
		if on_cd:
			var duration := _skill_cooldown(int(s.id))
			var frac: float = clampf((s.cd_end - t) / duration, 0.0, 1.0)
			_slots[slot].cd.anchor_top = 1.0 - frac

func _skill_cooldown(skill_id: int) -> float:
	if table and table.has_method("cooldown_of"):
		var level := 0
		if client and client.has_method("get_skills"):
			for skill in client.get_skills():
				if int(skill.get("id", 0)) == skill_id:
					level = int(skill.get("level", 0))
					break
		var configured := float(table.cooldown_of(skill_id, level))
		if configured > 0.0:
			return configured
	return DEFAULT_CD

func _now() -> float:
	return Time.get_ticks_msec() / 1000.0