# VERTICAL SLICE - NOT FOR PRODUCTION
# 实现 GDD：design/ux/battle.md（D 区 toast 槽——非模态提示：拒绝原因双源/voided/chord/
# 零合法板；自动消退 2.5s；pattern 1/10 呈现通道）。
# Date: 2026-09-12
# 高内聚边界：纯呈现——组合根决定何时弹什么文案；本类只管槽位堆叠与消退动画。
class_name ToastStack
extends Control

const LIFE_SEC := 2.5
const MAX_SLOTS := 3
const COL_INFO := UiKit.INK
const COL_WARN := UiKit.RED_MINE          # 危险红族——拒绝/作废（旗朱退役 2026-09-26）
const COL_GOLD := UiKit.GOLD_DEEP         # 奖励金族——提示/达成（深金档）

var _slot_box: VBoxContainer


func _init() -> void:
	mouse_filter = Control.MOUSE_FILTER_IGNORE
	set_anchors_preset(Control.PRESET_TOP_WIDE)
	custom_minimum_size = Vector2(0, 84)
	_slot_box = VBoxContainer.new()
	_slot_box.mouse_filter = Control.MOUSE_FILTER_IGNORE
	_slot_box.alignment = BoxContainer.ALIGNMENT_BEGIN
	_slot_box.add_theme_constant_override("separation", 2)
	add_child(_slot_box)


func show_toast(text: String, tone: String = "info") -> void:
	while _slot_box.get_child_count() >= MAX_SLOTS:
		var old: Control = _slot_box.get_child(0)
		_slot_box.remove_child(old)
		old.queue_free()
	var row := PanelContainer.new()
	row.mouse_filter = Control.MOUSE_FILTER_IGNORE
	row.clip_contents = true   # 缺陷①约束：固定槽高裁剪，不回流布局
	row.custom_minimum_size = Vector2(0, 24)
	var sb := UiKit.panel_flat(UiKit.TOAST_BG, COL_INFO, 2, 1, Vector4(8, 2, 8, 2))
	var col := COL_INFO
	if tone == "warn":
		col = COL_WARN
	elif tone == "gold":
		col = COL_GOLD
	sb.border_color = col
	row.add_theme_stylebox_override("panel", sb)
	var lab := UiKit.label(("⚠ " if tone == "warn" else "") + text, 14, tone != "info")
	lab.add_theme_color_override("font_color", col)
	lab.clip_text = true
	row.add_child(lab)
	_slot_box.add_child(row)
	var tw := row.create_tween()
	tw.tween_interval(LIFE_SEC)
	tw.tween_property(row, "modulate:a", 0.0, 0.35)
	tw.tween_callback(func():
		if is_instance_valid(row):
			row.queue_free())