Add generator buffs (additional test required)

generator/generator_buff_data.gd

@@ -0,0 +1,95 @@
+class_name GeneratorBuffData
+extends Resource
+
+enum BuffKind {
+	AUTO_PRODUCTION_MULTIPLIER,
+	MANUAL_CLICK_MULTIPLIER,
+	RESOURCE_PURCHASE,
+}
+
+const HUGE_EXPONENT: int = 1000000
+
+@export var id: StringName = &""
+@export var kind: BuffKind = BuffKind.AUTO_PRODUCTION_MULTIPLIER
+@export_multiline var text: String = ""
+@export var icon: Texture2D
+@export var max_level: int = -1
+
+@export_group("Effect")
+@export var base_effect: float = 1.0
+@export var effect_increment: float = 0.1
+
+@export_group("Cost")
+@export var cost_currency: Resource
+@export var base_cost_mantissa: float = 10.0
+@export var base_cost_exponent: int = 0
+@export var cost_multiplier: float = 1.5
+
+@export_group("Resource Purchase")
+@export var resource_target_currency: Resource
+@export var resource_purchase_base_mantissa: float = 10.0
+@export var resource_purchase_base_exponent: int = 0
+@export var resource_purchase_increment_multiplier: float = 1.2
+
+func can_purchase_next_level(current_level: int) -> bool:
+	if max_level < 0:
+		return true
+	return maxi(current_level, 0) < max_level
+
+func get_effect_multiplier(level: int) -> float:
+	var safe_level: int = maxi(level, 0)
+	return maxf(base_effect + (effect_increment * float(safe_level)), 0.0)
+
+func get_cost_for_level(level: int) -> BigNumber:
+	var safe_level: int = maxi(level, 0)
+	var base_cost: BigNumber = BigNumber.new(base_cost_mantissa, base_cost_exponent)
+	if base_cost.mantissa <= 0.0:
+		return BigNumber.from_float(0.0)
+
+	if cost_multiplier <= 0.0:
+		return BigNumber.new(1.0, HUGE_EXPONENT)
+
+	var growth: float = 1.0
+	if not is_equal_approx(cost_multiplier, 1.0):
+		growth = pow(cost_multiplier, float(safe_level))
+	if not is_finite(growth):
+		return BigNumber.new(1.0, HUGE_EXPONENT)
+
+	return _scale_big_number(base_cost, growth)
+
+func get_resource_purchase_amount_for_level(level: int) -> BigNumber:
+	var safe_level: int = maxi(level, 0)
+	var base_amount: BigNumber = BigNumber.new(resource_purchase_base_mantissa, resource_purchase_base_exponent)
+	if base_amount.mantissa <= 0.0:
+		return BigNumber.from_float(0.0)
+
+	if resource_purchase_increment_multiplier <= 0.0:
+		return BigNumber.from_float(0.0)
+
+	var growth: float = 1.0
+	if not is_equal_approx(resource_purchase_increment_multiplier, 1.0):
+		growth = pow(resource_purchase_increment_multiplier, float(safe_level))
+	if not is_finite(growth):
+		return BigNumber.new(1.0, HUGE_EXPONENT)
+
+	return _scale_big_number(base_amount, growth)
+
+func get_effect_description(level: int) -> String:
+	var safe_level: int = maxi(level, 0)
+	match kind:
+		BuffKind.AUTO_PRODUCTION_MULTIPLIER, BuffKind.MANUAL_CLICK_MULTIPLIER:
+			return "x%.2f" % get_effect_multiplier(safe_level)
+		BuffKind.RESOURCE_PURCHASE:
+			return "+%s" % get_resource_purchase_amount_for_level(safe_level).to_string_suffix(2)
+		_:
+			return "-"
+
+func _scale_big_number(base_amount: BigNumber, scale: float) -> BigNumber:
+	if base_amount.mantissa <= 0.0:
+		return BigNumber.from_float(0.0)
+	if scale <= 0.0:
+		return BigNumber.from_float(0.0)
+	if not is_finite(scale):
+		return BigNumber.new(1.0, HUGE_EXPONENT)
+
+	return base_amount.multiply(BigNumber.from_float(scale))