# VERTICAL SLICE - NOT FOR PRODUCTION
# Date: 2026-09-21（GP+商店房实施批——商店房覆盖层呈现）
# 商店覆盖层（模态）：标题「商店」/ 金币余额 / 三商品卡全陈列（显示名·档位文案·现价·已购档数）/
# 购买按钮（余额不足禁用置灰）/ 离开按钮。模态挂接方式仿既有覆盖层（route_overlay 现成参照——
# dim + CenterContainer + box，组合根 _register_modal 收口层级）。
# 高内聚边界：纯视图 setter 面——商品快照与余额经组合根喂入（runner.shop_products() 只读投影，
# 现价/已购档数由 runner 现算），购买/离开意图经信号外发——零核心写调用、零 runner 持有。
class_name ShopOverlay
extends Control

signal buy_requested(product_id: String)
signal leave_pressed

const ATTR_LABELS := {"atk": "攻击", "max_hp": "生命上限", "armor_class": "护甲"}   # 档位文案轴（数据契约 attr 词表）

var _gp_label: Label
var _cards_box: VBoxContainer
var _card_rows: Array[Dictionary] = []   # [{product_id, price, bought, btn}]——refresh_state 就地重刷（零重建回流）


func _init() -> void:
	var dim := ColorRect.new()
	dim.color = Color(0, 0, 0, 0.6)
	dim.set_anchors_preset(Control.PRESET_FULL_RECT)
	add_child(dim)
	var center := CenterContainer.new()
	center.set_anchors_preset(Control.PRESET_FULL_RECT)
	dim.add_child(center)
	var box := VBoxContainer.new()
	box.add_theme_constant_override("separation", 12)
	center.add_child(box)
	var title := UiKit.label("商店", 26, true)
	title.add_theme_color_override("font_color", UiKit.WARM)
	title.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	box.add_child(title)
	_gp_label = UiKit.label("金币 0", 18, true)
	_gp_label.add_theme_color_override("font_color", UiKit.GOLD)
	_gp_label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	box.add_child(_gp_label)
	_cards_box = VBoxContainer.new()
	_cards_box.add_theme_constant_override("separation", 8)
	box.add_child(_cards_box)
	var leave_btn := UiKit.button("离开商店")
	leave_btn.pressed.connect(_emit_leave_pressed)
	box.add_child(leave_btn)
	visible = false


# 打开商店（products = runner.shop_products() 投影——[{product_id, display_name, attr, flat_value, price, purchased}]）
func open_shop(products: Array, gp: int) -> void:
	for child in _cards_box.get_children():
		child.queue_free()
	_card_rows.clear()
	for p in products:
		_card_rows.append(_build_card(p))
	refresh_state(products, gp)
	visible = true


# 状态重刷（购买/钱包变化后调用——就地改文案与按钮禁用态，零重建）
func refresh_state(products: Array, gp: int) -> void:
	_gp_label.text = "金币 %d" % gp
	var by_id := {}
	for p in products:
		by_id[String(p.product_id)] = p
	for card in _card_rows:
		var p: Dictionary = by_id.get(String(card.product_id), {})
		if p.is_empty():
			continue
		card.price.text = "现价 %d 金币" % int(p.price)
		card.bought.text = "已购 %d 档" % int(p.purchased)
		card.btn.disabled = gp < int(p.price)   # 余额不足禁用置灰


# 商品卡（显示名 + 档位文案 | 现价 | 已购档数 | 购买按钮）
func _build_card(p: Dictionary) -> Dictionary:
	var card := PanelContainer.new()
	card.add_theme_stylebox_override("panel", UiKit.panel_flat(UiKit.BG_OVERLAY, UiKit.GOLD_DIM, 4, 1, Vector4(12, 6, 12, 6)))
	var row := HBoxContainer.new()
	row.add_theme_constant_override("separation", 14)
	card.add_child(row)
	var name_l := UiKit.label(_card_title(p), 15, true)
	name_l.custom_minimum_size = Vector2(190, 0)
	row.add_child(name_l)
	var price_l := UiKit.label("", 14, false)
	price_l.add_theme_color_override("font_color", UiKit.WARM_SOFT)
	price_l.custom_minimum_size = Vector2(110, 0)
	row.add_child(price_l)
	var bought_l := UiKit.label("", 14, false)
	bought_l.add_theme_color_override("font_color", UiKit.WARM_FAINT)
	row.add_child(bought_l)
	var btn := UiKit.button("购买")
	btn.pressed.connect(_emit_buy_requested.bind(p))
	row.add_child(btn)
	_cards_box.add_child(card)
	return {"product_id": String(p.product_id), "price": price_l, "bought": bought_l, "btn": btn}


# 卡题 = 显示名 + 档位文案（attr →「攻击 +1」形）
func _card_title(p: Dictionary) -> String:
	var attr := String(p.get("attr", ""))
	return "%s（%s %+d）" % [String(p.get("display_name", "")), String(ATTR_LABELS.get(attr, attr)), int(p.get("flat_value", 0))]


func _emit_leave_pressed() -> void:
	leave_pressed.emit()


func _emit_buy_requested(p: Dictionary) -> void:
	buy_requested.emit(String(p.product_id))