Add shop supplies and rebalance early economy

progression/player_cooler_capacity.gd

@@ -0,0 +1,65 @@
+class_name PlayerCoolerCapacity
+extends Node
+
+const PlayerWalletType = preload("res://economy/player_wallet.gd")
+
+signal capacity_changed(level: int, capacity: int)
+
+const CAPACITIES: Array[int] = [12, 18, 24, 32, 40]
+const EXPANSION_COSTS: Array[int] = [75, 175, 400, 850]
+const MAX_LEVEL: int = 4
+
+var _capacity_level: int = 0
+
+
+func get_level() -> int:
+	return _capacity_level
+
+
+func get_capacity() -> int:
+	return CAPACITIES[_capacity_level]
+
+
+func get_next_capacity() -> int:
+	if _capacity_level >= MAX_LEVEL:
+		return -1
+	return CAPACITIES[_capacity_level + 1]
+
+
+func get_next_cost() -> int:
+	if _capacity_level >= MAX_LEVEL:
+		return -1
+	return EXPANSION_COSTS[_capacity_level]
+
+
+func can_purchase(wallet: PlayerWalletType) -> bool:
+	var cost: int = get_next_cost()
+	return wallet != null and cost >= 0 and wallet.can_afford(cost)
+
+
+func purchase(wallet: PlayerWalletType) -> bool:
+	if not can_purchase(wallet):
+		return false
+	var cost: int = get_next_cost()
+	if not wallet.debit(cost):
+		return false
+	_capacity_level += 1
+	capacity_changed.emit(_capacity_level, get_capacity())
+	return true
+
+
+func restore_level(level: int) -> bool:
+	var validated: int = clampi(level, 0, MAX_LEVEL)
+	var changed: bool = _capacity_level != validated
+	_capacity_level = validated
+	if changed:
+		capacity_changed.emit(_capacity_level, get_capacity())
+	return true
+
+
+func reset_to_defaults() -> void:
+	restore_level(0)
+
+
+func to_save_data() -> Dictionary:
+	return {"capacity_level": _capacity_level}