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scripts/autoloads/shop_manager.gd

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+## ShopManager — 商店管理（Autoload: ShopManager）
+## S2 范围：3 选 1 法术、金币扣减、刷新费用公式（P6-N23）
+## 权威来源：development_plan.md S2、numerical_design.md §2.3
+extends Node
+
+signal shop_refreshed
+signal shop_closed
+
+const SLOT_COUNT: int = 3
+const REROLL_BASE_COST: int = 20  # 第 1 次刷新费用
+const REROLL_STEP:      int = 10  # 每次递增价格
+
+var current_slots:   Array  = []   # Array[SpellNode] （null 表示已售出）
+var reroll_count:    int    = 0    # 本波已刷新次数（WAVE_COMPLETE 后重置）
+var _shop_seed:      int    = 0    # 随机种（ADR-A2 P-S2-07）
+var _rng:            RandomNumberGenerator = RandomNumberGenerator.new()
+
+func _ready() -> void:
+	EventBus.subscribe(EventID.WAVE_COMPLETE, _on_wave_complete)
+
+func _on_wave_complete(_payload: Dictionary) -> void:
+	reroll_count = 0  # P6-N23：波次结算后重置刷新次数
+
+func open_shop(seed_override: int = -1) -> void:
+	if seed_override >= 0:
+		_shop_seed = seed_override
+	else:
+		_shop_seed = randi()
+	_rng.seed = _shop_seed
+	_refresh_slots()
+	EventBus.emit(EventID.SHOP_OPENED, {"seed": _shop_seed})
+
+func _refresh_slots() -> void:
+	# 纯数据驱动池：SpellRegistry（data/spells.json）中可购买（shop_cost>0）的法术
+	var pool: Array = SpellRegistry.get_all_ids().filter(func(id):
+		var s: SpellNode = SpellRegistry.get_spell(id)
+		return s != null and int(s.meta.get("shop_cost", 0)) > 0)
+	current_slots.clear()
+	for _i in SLOT_COUNT:
+		if pool.is_empty():
+			current_slots.append(null)
+			continue
+		var idx: int = _rng.randi_range(0, pool.size() - 1)
+		current_slots.append(SpellRegistry.get_spell(pool[idx]))
+		pool.remove_at(idx)
+	shop_refreshed.emit()
+
+## 购买指定槽位的法术，返回购买的 SpellNode、失败返回 null
+func buy_spell(slot_idx: int) -> SpellNode:
+	if slot_idx < 0 or slot_idx >= current_slots.size():
+		return null
+	var spell: SpellNode = current_slots[slot_idx]
+	if spell == null:
+		return null
+	var cost: int = int(spell.meta.get("shop_cost", 20))
+	if not PlayerStats.spend_gold(cost):
+		return null
+	current_slots[slot_idx] = null
+	shop_refreshed.emit()
+	return spell
+
+## 刷新商店，返回 true 表示成功
+func reroll() -> bool:
+	var cost: int = get_reroll_cost()
+	if not PlayerStats.spend_gold(cost):
+		return false
+	reroll_count += 1
+	_rng.seed = _shop_seed + reroll_count * 31337
+	_refresh_slots()
+	return true
+
+## 刷新费用公式：base + step * reroll_count（P6-N23）
+func get_reroll_cost() -> int:
+	return REROLL_BASE_COST + reroll_count * REROLL_STEP
+
+func close_shop() -> void:
+	current_slots.clear()
+	shop_closed.emit()
+
+func get_shop_seed() -> int:
+	return _shop_seed
+
+func reset() -> void:
+	current_slots.clear()
+	reroll_count = 0
+	_shop_seed   = 0