feat: add knowledge-gated pantry opportunities

simulation/opportunities/FoodShortageOpportunitySystem.gd

@@ -0,0 +1,184 @@
+class_name FoodShortageOpportunitySystem
+extends RefCounted
+
+const CARE_HUNGER_THRESHOLD := 80.0
+
+var opportunities: Array[OpportunityStateRecord] = []
+var next_opportunity_id := 0
+
+
+func consider_event(
+	event: EconomicEventRecord,
+	current_tick: int,
+	pantry: StorageStateRecord,
+	npcs: Array[SimNPC],
+	knowledge_system: EventKnowledgeSystem,
+	resource_states: Dictionary
+) -> OpportunityStateRecord:
+	if event == null or pantry == null or current_tick < 0:
+		return null
+	var event_tick := int(event.data["tick"])
+	if event_tick < 0 or event_tick > current_tick:
+		return null
+	var resolved := _try_resolve(event, pantry, npcs, resource_states)
+	if resolved != null:
+		return resolved
+	return _try_open(event, current_tick, pantry, npcs, knowledge_system)
+
+
+func restore(records: Array[OpportunityStateRecord], restored_next_id: int) -> void:
+	opportunities = records.duplicate()
+	opportunities.sort_custom(_sort_by_id)
+	next_opportunity_id = maxi(restored_next_id, 0)
+
+
+func get_all_sorted() -> Array[OpportunityStateRecord]:
+	var sorted := opportunities.duplicate()
+	sorted.sort_custom(_sort_by_id)
+	return sorted
+
+
+func get_open_sorted() -> Array[OpportunityStateRecord]:
+	var open_records: Array[OpportunityStateRecord] = []
+	for opportunity in opportunities:
+		if opportunity.is_open():
+			open_records.append(opportunity)
+	open_records.sort_custom(_sort_by_id)
+	return open_records
+
+
+func get_open_opportunity() -> OpportunityStateRecord:
+	var open_records := get_open_sorted()
+	return open_records[0] if not open_records.is_empty() else null
+
+
+func get_latest() -> OpportunityStateRecord:
+	var sorted := get_all_sorted()
+	return sorted[-1] if not sorted.is_empty() else null
+
+
+func get_latest_for_npc(npc_id: int) -> OpportunityStateRecord:
+	for index in range(opportunities.size() - 1, -1, -1):
+		var opportunity := opportunities[index]
+		if opportunity.get_interested_npc_id() == npc_id:
+			return opportunity
+	return null
+
+
+func _try_open(
+	event: EconomicEventRecord,
+	current_tick: int,
+	pantry: StorageStateRecord,
+	npcs: Array[SimNPC],
+	knowledge_system: EventKnowledgeSystem
+) -> OpportunityStateRecord:
+	if knowledge_system == null or get_open_opportunity() != null:
+		return null
+	if pantry.get_amount(SimulationIds.RESOURCE_FOOD) > 0.0:
+		return null
+	if not _is_food_withdrawal(event):
+		return null
+	var interested_npc := _select_interested_npc(
+		int(event.data["event_id"]), npcs, knowledge_system
+	)
+	if interested_npc == null:
+		return null
+	var opportunity := OpportunityStateRecord.create(
+		next_opportunity_id, current_tick, int(event.data["event_id"]), interested_npc.id
+	)
+	next_opportunity_id += 1
+	opportunities.append(opportunity)
+	return opportunity
+
+
+func _try_resolve(
+	event: EconomicEventRecord,
+	pantry: StorageStateRecord,
+	npcs: Array[SimNPC],
+	resource_states: Dictionary
+) -> OpportunityStateRecord:
+	var opportunity := get_open_opportunity()
+	if opportunity == null:
+		return null
+	if pantry.get_amount(SimulationIds.RESOURCE_FOOD) < opportunity.get_target_amount():
+		return null
+	if not _is_valid_supply(event, npcs, resource_states):
+		return null
+	if int(event.data["tick"]) < opportunity.get_created_tick():
+		return null
+	if int(event.data["event_id"]) <= opportunity.get_trigger_event_id():
+		return null
+	if not opportunity.resolve(int(event.data["event_id"]), int(event.data["tick"])):
+		return null
+	return opportunity
+
+
+func _select_interested_npc(
+	event_id: int, npcs: Array[SimNPC], knowledge_system: EventKnowledgeSystem
+) -> SimNPC:
+	var candidates: Array[SimNPC] = []
+	for npc in npcs:
+		if npc.is_dead or npc.hunger < CARE_HUNGER_THRESHOLD:
+			continue
+		if not knowledge_system.knows_event(npc.id, event_id):
+			continue
+		candidates.append(npc)
+	candidates.sort_custom(_sort_by_care)
+	return candidates[0] if not candidates.is_empty() else null
+
+
+static func _is_food_withdrawal(event: EconomicEventRecord) -> bool:
+	var actor_id := int(event.data["actor_id"])
+	return (
+		StringName(event.data["event_type"]) == SimulationIds.EVENT_STORAGE_WITHDRAWN
+		and actor_id >= 0
+		and StringName(event.data["source_id"]) == SimulationIds.STORAGE_VILLAGE_PANTRY
+		and StringName(event.data["destination_id"]) == SimulationIds.npc_inventory_id(actor_id)
+		and StringName(event.data["item_id"]) == SimulationIds.RESOURCE_FOOD
+		and float(event.data["amount"]) > 0.0
+	)
+
+
+static func _is_valid_supply(
+	event: EconomicEventRecord, npcs: Array[SimNPC], resource_states: Dictionary
+) -> bool:
+	if (
+		StringName(event.data["item_id"]) != SimulationIds.RESOURCE_FOOD
+		or StringName(event.data["destination_id"]) != SimulationIds.STORAGE_VILLAGE_PANTRY
+		or float(event.data["amount"]) <= 0.0
+	):
+		return false
+	var event_type := StringName(event.data["event_type"])
+	var actor_id := int(event.data["actor_id"])
+	if event_type == SimulationIds.EVENT_STORAGE_DEPOSITED:
+		return (
+			_find_npc(actor_id, npcs) != null
+			and StringName(event.data["source_id"]) == SimulationIds.npc_inventory_id(actor_id)
+		)
+	if event_type != SimulationIds.EVENT_RESOURCE_EXTRACTED or actor_id != -1:
+		return false
+	var resource_state := (
+		resource_states.get(StringName(event.data["source_id"])) as ResourceStateRecord
+	)
+	return (
+		resource_state != null
+		and resource_state.get_resource_id() == SimulationIds.RESOURCE_FOOD
+		and resource_state.can_player_use_resource()
+	)
+
+
+static func _sort_by_care(first: SimNPC, second: SimNPC) -> bool:
+	if first.hunger != second.hunger:
+		return first.hunger > second.hunger
+	return first.id < second.id
+
+
+static func _find_npc(npc_id: int, npcs: Array[SimNPC]) -> SimNPC:
+	for npc in npcs:
+		if npc.id == npc_id:
+			return npc
+	return null
+
+
+static func _sort_by_id(first: OpportunityStateRecord, second: OpportunityStateRecord) -> bool:
+	return first.get_opportunity_id() < second.get_opportunity_id()

simulation/opportunities/FoodShortageOpportunitySystem.gd.uid

@@ -0,0 +1 @@
+uid://r6gpw0hx8oe2