Use GoalData for everything

core/generator/currency_generator.gd

@@ -17,6 +17,8 @@ signal production_tick(amount: BigNumber, cycle_count: int, total_owned: int)
 signal buff_purchased(buff_id: StringName, new_level: int, cost: BigNumber, cost_currency_id: StringName)
 ## Emitted when a buff purchase cannot be paid.
 signal buff_purchase_failed(buff_id: StringName, required_cost: BigNumber, cost_currency_id: StringName)
+## Emitted when this generator unlock goal transitions to completed.
+signal goal_achieved(generator_id: StringName, goal_id: StringName)
 
 ## Sentinel exponent used when cost math overflows float range.
 const HUGE_COST_EXPONENT: int = 1000000
@@ -97,6 +99,7 @@ func _ready() -> void:
 	
 	GameState.currency_changed.connect(_on_currency_changed)
 	GameState.generator_state_changed.connect(_on_generated_state_changed)
+	_evaluate_generator_unlock_goal(false)
 
 ## Updates click cooldown/click grants and runs automatic production cycles.
 func _process(delta: float) -> void:
@@ -542,8 +545,29 @@ func _try_unlock_buff_from_goal(buff: GeneratorBuffData) -> void:
 	GameState.set_generator_buff_unlocked(_generator_id, buff_id, true)
 
 func _on_currency_changed(_changed_currency_id: StringName, _new_amount: BigNumber) -> void:
+	_evaluate_generator_unlock_goal(false)
 	_evaluate_buff_unlock_goals()
 
+func try_unlock_from_goal() -> bool:
+	return _evaluate_generator_unlock_goal(true)
+
+func _evaluate_generator_unlock_goal(allow_manual_unlock: bool) -> bool:
+	if data == null:
+		return false
+	if is_available_to_player():
+		return false
+	if not data.has_unlock_goal():
+		return false
+	if not data.unlocks_automatically_from_goal() and not allow_manual_unlock:
+		return false
+	if not data.is_unlock_goal_met():
+		return false
+
+	GameState.set_generator_unlocked(_generator_id, true)
+	GameState.set_generator_available(_generator_id, true)
+	goal_achieved.emit(_generator_id, data.get_unlock_goal_id())
+	return true
+
 ## Default unlocked state loaded from generator data.
 func _default_unlocked_state() -> bool:
 	if data == null: