extends Node

const SimulationEventLogScript := preload("res://simulation/events/SimulationEventLog.gd")
const VillageEconomyScript := preload("res://simulation/economy/VillageEconomy.gd")
const RelationshipSystemScript := preload("res://simulation/relationships/RelationshipSystem.gd")
const EventKnowledgeSystemScript := preload("res://simulation/knowledge/EventKnowledgeSystem.gd")

signal npc_task_changed(npc: SimNPC, old_task: StringName, new_task: StringName)
signal village_changed(village: SimVillage)
signal npc_died(npc: SimNPC)
signal npc_target_requested(npc: SimNPC)
signal npc_travel_requested(npc: SimNPC, target_position: Vector3)
signal npc_inventory_changed(npc: SimNPC, item_id: StringName, amount: float)
signal economic_event_recorded(event: EconomicEventRecord)
signal state_restored
signal npc_decision_recorded(npc: SimNPC, decision: ActionSelectionResult)
signal relationship_changed(relationship: RelationshipStateRecord, cause_event: EconomicEventRecord)
signal event_knowledge_changed(knower_id: int, event: EconomicEventRecord)
signal event_knowledge_transferred(speaker_id: int, listener_id: int, event: EconomicEventRecord)

var village := SimVillage.new()

var npcs: Array[SimNPC] = []
@export var tick_interval := 1.2
@export var simulation_seed: int = 1337
@export var cycle_duration_seconds := 240.0
@export var debug_logs := false
@export var active_world_adapter: Node
@export var home_positions: Array[Vector3] = []

var clock: SimulationClock
var tick_count := 0
var wander_random_sources := {}
var resource_states: Dictionary = {}
var event_log := SimulationEventLogScript.new()
var economy := VillageEconomyScript.new()
var relationship_system := RelationshipSystemScript.new()
var event_knowledge_system := EventKnowledgeSystemScript.new()
var storage_states: Dictionary:
	get:
		return economy.storage_states
var economic_events: Array[EconomicEventRecord]:
	get:
		return event_log.events
var next_event_id: int:
	get:
		return event_log.next_event_id
	set(value):
		event_log.next_event_id = value
var latest_decisions: Dictionary = {}
var action_selector := ActionSelectionSystem.new()
var action_executor := ActionExecutionSystem.new()
var target_resolver := ActionTargetResolver.new()
var speed_index := 2
const SPEED_LEVELS := [0.25, 0.5, 1.0, 2.0, 4.0, 10.0]
const KNOWLEDGE_COMMUNICATION_RADIUS := 2.5
signal speed_changed(multiplier: float)

const NPC_NAMES := ["Amina", "Tarik", "Jasmin", "Elma", "Mirza", "Lejla"]


func _ready() -> void:
	add_to_group("simulation_manager")
	event_log.event_recorded.connect(_on_economic_event_recorded)
	economy.inventory_changed.connect(_on_economy_inventory_changed)
	economy.economic_event_requested.connect(_record_economic_event)
	economy.narrative_event_requested.connect(record_narrative_event)
	action_selector.relationship_system = relationship_system
	var definition_errors := SimulationDefinitions.validate()
	if not definition_errors.is_empty():
		for error in definition_errors:
			push_error("SimulationManager: " + error)
		set_process(false)
		return
	clock = SimulationClock.new(tick_interval)
	clock.cycle_duration_seconds = cycle_duration_seconds
	clock.elapsed_ticks = int(0.25 * cycle_duration_seconds / tick_interval)
	village.debug_logs = debug_logs
	economy.configure(village, debug_logs)
	economy.initialize_storage()
	village.update_modifiers()
	village.update_priorities()
	generate_npcs()
	relationship_system.initialize_households(npcs)
	call_deferred("register_loaded_resource_nodes")
	call_deferred("register_loaded_storage_nodes")
	if debug_logs:
		print("--- Simulation started ---")


func _process(delta: float) -> void:
	var ticks_due := clock.advance(delta * SPEED_LEVELS[speed_index])
	for tick in ticks_due:
		simulate_tick()


func _input(event: InputEvent) -> void:
	if not event is InputEventKey or not event.pressed or event.echo:
		return
	if event.keycode == KEY_BRACKETLEFT:
		speed_index = maxi(speed_index - 1, 0)
		speed_changed.emit(SPEED_LEVELS[speed_index])
		if debug_logs:
			print("[SimulationManager] Speed: %.2fx" % SPEED_LEVELS[speed_index])
	elif event.keycode == KEY_BRACKETRIGHT:
		speed_index = mini(speed_index + 1, SPEED_LEVELS.size() - 1)
		speed_changed.emit(SPEED_LEVELS[speed_index])
		if debug_logs:
			print("[SimulationManager] Speed: %.2fx" % SPEED_LEVELS[speed_index])


func generate_npcs() -> void:
	var profession_ids := SimulationDefinitions.get_profession_ids()
	for i in range(NPC_NAMES.size()):
		var npc_random := _create_random_source(i, 0)
		var profession_index := npc_random.randi_range(0, profession_ids.size() - 1)
		var npc := SimNPC.new(
			i,
			NPC_NAMES[i],
			profession_ids[profession_index],
			npc_random.randf_range(1.0, 10.0),
			npc_random.randf_range(1.0, 10.0),
			npc_random
		)

		npc.debug_logs = debug_logs
		npcs.append(npc)
		wander_random_sources[i] = _create_random_source(i, 1)

	var home_count := home_positions.size()
	if home_count > 0:
		for i in range(npcs.size()):
			npcs[i].home_position = home_positions[i % home_count]


func _create_random_source(npc_id: int, stream_id: int) -> RandomNumberGenerator:
	var source := RandomNumberGenerator.new()
	source.seed = simulation_seed + (npc_id + 1) * 1000003 + stream_id * 7919
	return source


func get_wander_offset(npc_id: int) -> Vector3:
	var source: RandomNumberGenerator = wander_random_sources.get(npc_id)
	if source == null:
		source = _create_random_source(npc_id, 1)
		wander_random_sources[npc_id] = source
	return Vector3(source.randf_range(-6.0, 6.0), 0.0, source.randf_range(-6.0, 6.0))


func simulate_tick() -> void:
	tick_count += 1
	if debug_logs:
		print("--- Tick ", tick_count, " ---")

	var village_was_changed := false
	for npc in npcs:
		village_was_changed = _simulate_npc_tick(npc) or village_was_changed

	if village_was_changed:
		village_changed.emit(village)

	if debug_logs:
		print(village.get_summary())


func _simulate_npc_tick(npc: SimNPC) -> bool:
	var previous_task := npc.current_task
	var previous_target := npc.target_id
	var previous_state := npc.task_state
	var was_complete := npc.task_complete
	var was_dead := npc.is_dead

	action_executor.advance_npc(npc, village)
	_select_action_if_idle(npc, previous_state)

	if previous_task != npc.current_task and not previous_target.is_empty():
		release_npc_reservation(npc.id)

	if not was_dead and npc.is_dead:
		_handle_npc_death(npc, previous_task, previous_target)
	elif previous_task != npc.current_task:
		npc_task_changed.emit(npc, previous_task, npc.current_task)
		npc_target_requested.emit(npc)

	var completed := not was_complete and npc.task_complete and not npc.is_dead
	if completed:
		_complete_current_action(npc)

	_debug_npc_tick(npc, previous_state)
	return completed


func _select_action_if_idle(npc: SimNPC, previous_state: StringName) -> void:
	if npc.is_dead:
		return
	if previous_state not in [SimNPC.TASK_STATE_IDLE, SimNPC.TASK_STATE_COMPLETE]:
		return
	if npc.task_state not in [SimNPC.TASK_STATE_IDLE, SimNPC.TASK_STATE_COMPLETE]:
		return
	var selection := action_selector.select_action(npc, village, clock.time_of_day(), npcs)
	if selection == null:
		return
	latest_decisions[npc.id] = selection
	npc_decision_recorded.emit(npc, selection)
	npc.set_task(selection.action_id, selection.duration_override)
	var definition := SimulationDefinitions.get_action(selection.action_id)
	var display_name := (
		definition.display_name if definition != null else String(selection.action_id)
	)
	record_narrative_event(SimulationIds.EVENT_TASK_STARTED, npc.id, &"", display_name)


func _handle_npc_death(npc: SimNPC, previous_task: StringName, previous_target: StringName) -> void:
	if not previous_target.is_empty():
		release_npc_reservation(npc.id)
	npc_died.emit(npc)
	npc_task_changed.emit(npc, previous_task, npc.current_task)
	record_narrative_event(SimulationIds.EVENT_NPC_DIED, npc.id)
	_notify_mourning(npc)
	if debug_logs:
		print("[SimulationManager] NPC died: ", npc.npc_name)


func _complete_current_action(npc: SimNPC) -> void:
	var completed_task := npc.current_task
	var definition := SimulationDefinitions.get_action(completed_task)
	if economy.consume_completion_cost(npc, definition):
		_apply_action_completion(npc, completed_task, definition)
	elif not npc.target_id.is_empty():
		release_npc_reservation(npc.id)

	npc.task_complete = true
	npc.task_state = SimNPC.TASK_STATE_IDLE
	npc.last_task = completed_task
	npc.current_task = SimulationIds.ACTION_IDLE
	npc.has_travel_target = false
	npc.target_id = &""
	npc_task_changed.emit(npc, completed_task, npc.current_task)


func _apply_action_completion(
	npc: SimNPC, completed_task: StringName, definition: ActionDefinition
) -> void:
	if definition != null and definition.target_type == SimulationIds.TARGET_RESOURCE:
		_complete_resource_gather(npc, completed_task)
		return
	match completed_task:
		SimulationIds.ACTION_DEPOSIT_FOOD:
			economy.deposit_inventory(npc, SimulationIds.RESOURCE_FOOD)
		SimulationIds.ACTION_DEPOSIT_WOOD:
			economy.deposit_inventory(npc, SimulationIds.RESOURCE_WOOD)
		SimulationIds.ACTION_WITHDRAW_FOOD:
			economy.withdraw_to_inventory(npc, SimulationIds.RESOURCE_FOOD, 1.0)
		SimulationIds.ACTION_EAT:
			economy.consume_npc_food(npc)
		SimulationIds.ACTION_SLEEP:
			npc.energy = minf(npc.energy + 40.0, 100.0)
			npc.position = npc.home_position
			record_narrative_event(SimulationIds.EVENT_NPC_SLEPT, npc.id)
		SimulationIds.ACTION_PATROL, SimulationIds.ACTION_STUDY, SimulationIds.ACTION_REST, SimulationIds.ACTION_WANDER:
			village.apply_npc_task(npc)
	if debug_logs and completed_task == SimulationIds.ACTION_SLEEP:
		print("[SimulationManager] ", npc.npc_name, " completed sleep at home")


func _complete_resource_gather(npc: SimNPC, completed_task: StringName) -> void:
	var resource_state := get_resource_state(npc.target_id)
	if resource_state == null or resource_state.get_reserved_by() != npc.id:
		if debug_logs:
			print(
				(
					"[SimulationManager] %s could not complete %s: invalid reservation"
					% [npc.npc_name, completed_task]
				)
			)
		release_npc_reservation(npc.id)
		return

	var extracted := resource_state.extract()
	if extracted > 0.0:
		var resource_id := resource_state.get_resource_id()
		npc.add_inventory(resource_id, extracted)
		npc_inventory_changed.emit(npc, resource_id, npc.get_inventory_amount(resource_id))
		_record_economic_event(
			SimulationIds.EVENT_RESOURCE_EXTRACTED,
			npc.id,
			resource_state.get_node_id(),
			SimulationIds.npc_inventory_id(npc.id),
			resource_id,
			extracted
		)
		if resource_state.get_amount_remaining() <= 0.0:
			record_narrative_event(
				SimulationIds.EVENT_RESOURCE_DEPLETED, npc.id, resource_state.get_node_id()
			)
		if debug_logs:
			print(
				(
					"[SimulationManager] %s extracted %.1f %s from %s"
					% [npc.npc_name, extracted, resource_id, resource_state.get_node_id()]
				)
			)
	release_npc_reservation(npc.id)


func _debug_npc_tick(npc: SimNPC, previous_state: StringName) -> void:
	if not debug_logs:
		return
	print(
		npc.npc_name,
		" | ",
		npc.profession,
		" | task: ",
		npc.current_task,
		" | state: ",
		npc.task_state,
		" | progress: ",
		npc.task_progress,
		"/",
		npc.task_duration,
		" | complete: ",
		npc.task_complete,
		" | hunger: ",
		round(npc.hunger),
		" | energy: ",
		round(npc.energy),
		" | starving: ",
		npc.is_starving,
		" | starvation_ticks: ",
		npc.starvation_ticks,
		" | dead: ",
		npc.is_dead
	)
	if previous_state != npc.task_state:
		print(
			"[SimulationManager] State changed: ",
			npc.npc_name,
			" ",
			previous_state,
			" -> ",
			npc.task_state
		)


func release_npc_reservation(npc_id: int) -> void:
	for npc in npcs:
		if npc.id == npc_id:
			if npc.target_id != &"":
				var resource_state := get_resource_state(npc.target_id)
				if resource_state != null:
					resource_state.release(npc.id)
				npc.target_id = &""
			return


func notify_npc_arrived(npc_id: int) -> void:
	for npc in npcs:
		if npc.id == npc_id:
			if npc.is_dead:
				return

			if npc.task_state == SimNPC.TASK_STATE_TRAVELING:
				var definition := SimulationDefinitions.get_action(npc.current_task)
				if (
					npc.target_id != &""
					and definition != null
					and definition.target_type == SimulationIds.TARGET_RESOURCE
				):
					var resource_state := get_resource_state(npc.target_id)
					if (
						resource_state == null
						or not resource_state.can_extract()
						or resource_state.get_reserved_by() != npc.id
					):
						if debug_logs:
							print(
								"[SimulationManager] ",
								npc.npc_name,
								" arrived but target ",
								npc.target_id,
								" is unavailable, replanning"
							)
						notify_npc_navigation_failed(npc.id)
						return

				npc.has_travel_target = false
				npc.start_working()

				var working_speakers: Array[SimNPC] = []
				if npc.target_id != &"":
					for other in npcs:
						if other.id == npc.id or other.is_dead:
							continue
						if other.target_id != npc.target_id:
							continue
						if (
							other.task_state
							in [SimNPC.TASK_STATE_TRAVELING, SimNPC.TASK_STATE_WORKING]
						):
							relationship_system.increase_shared_work_familiarity(npc.id, other.id)
						if other.task_state == SimNPC.TASK_STATE_WORKING:
							working_speakers.append(other)
				working_speakers.sort_custom(_sort_npcs_by_id)
				for speaker in working_speakers:
					if try_communicate_at_shared_activity(speaker.id, npc.id):
						break

				if debug_logs:
					print(
						"[SimulationManager] ",
						npc.npc_name,
						" arrived and started working on: ",
						npc.current_task
					)
			return


func notify_npc_navigation_failed(npc_id: int) -> void:
	for npc in npcs:
		if npc.id != npc_id:
			continue
		if npc.is_dead or npc.task_state != SimNPC.TASK_STATE_TRAVELING:
			return

		var failed_task := npc.current_task
		release_npc_reservation(npc.id)
		npc.last_task = failed_task
		npc.set_task(SimulationIds.ACTION_WANDER, 2.0)
		npc_task_changed.emit(npc, failed_task, npc.current_task)
		npc_target_requested.emit(npc)

		if debug_logs:
			print(
				"[SimulationManager] ",
				npc.npc_name,
				" could not navigate for ",
				failed_task,
				" and is trying a wander target"
			)
		return


func resolve_npc_target(npc_id: int, origin: Vector3) -> bool:
	for npc in npcs:
		if npc.id != npc_id:
			continue
		if npc.is_dead or npc.task_state != SimNPC.TASK_STATE_TRAVELING:
			return false
		if npc.current_task == SimulationIds.ACTION_SLEEP:
			npc.travel_target_position = npc.home_position
			npc.has_travel_target = true
			npc_travel_requested.emit(npc, npc.travel_target_position)
			return true
		if active_world_adapter == null:
			push_error("SimulationManager: active_world_adapter is missing")
			return false
		var result := target_resolver.resolve(npc, origin, self, active_world_adapter)
		if result.is_empty():
			notify_npc_navigation_failed(npc.id)
			return false
		npc.target_id = StringName(result.get("target_id", ""))
		npc.travel_target_position = result["position"]
		npc.has_travel_target = true
		npc_travel_requested.emit(npc, npc.travel_target_position)
		return true
	return false


func request_current_travel(npc_id: int) -> bool:
	for npc in npcs:
		if npc.id != npc_id:
			continue
		if npc.task_state != SimNPC.TASK_STATE_TRAVELING:
			return false
		if npc.has_travel_target:
			npc_travel_requested.emit(npc, npc.travel_target_position)
		else:
			npc_target_requested.emit(npc)
		return true
	return false


func synchronize_npc_position(npc_id: int, active_position: Vector3) -> bool:
	for npc in npcs:
		if npc.id == npc_id:
			npc.position = active_position
			return true
	return false


func get_activity_target_claim_count(target_id: StringName, except_npc_id: int = -1) -> int:
	var count := 0
	for npc in npcs:
		if npc.id == except_npc_id or npc.is_dead:
			continue
		if npc.target_id != target_id:
			continue
		if npc.task_state in [SimNPC.TASK_STATE_TRAVELING, SimNPC.TASK_STATE_WORKING]:
			count += 1
	return count


func _notify_mourning(dead_npc: SimNPC) -> void:
	var mourner := relationship_system.get_most_familiar_living_subject(dead_npc.id, npcs)
	if mourner == null:
		return
	mourner.mourning_ticks = 100
	if debug_logs:
		print("[SimulationManager] ", mourner.npc_name, " is mourning ", dead_npc.npc_name)


func _record_economic_event(
	event_type: StringName,
	actor_id: int,
	source_id: StringName,
	destination_id: StringName,
	item_id: StringName,
	amount: float
) -> void:
	_record_economic_event_at(
		event_type,
		actor_id,
		source_id,
		destination_id,
		item_id,
		amount,
		_get_event_world_position(actor_id, source_id, destination_id)
	)


func _record_economic_event_at(
	event_type: StringName,
	actor_id: int,
	source_id: StringName,
	destination_id: StringName,
	item_id: StringName,
	amount: float,
	world_position: Vector3
) -> void:
	event_log.record_economic(
		tick_count, event_type, actor_id, source_id, destination_id, item_id, amount, world_position
	)


func record_narrative_event(
	event_type: StringName, actor_id: int, source_id: StringName = &"", action_display: String = ""
) -> void:
	_record_narrative_event_at(
		event_type,
		actor_id,
		source_id,
		action_display,
		_get_event_world_position(actor_id, source_id, &"")
	)


func _record_narrative_event_at(
	event_type: StringName,
	actor_id: int,
	source_id: StringName,
	action_display: String,
	world_position: Vector3
) -> void:
	event_log.record_narrative(
		tick_count, event_type, actor_id, source_id, action_display, world_position
	)


func _get_event_world_position(
	actor_id: int, source_id: StringName, destination_id: StringName
) -> Vector3:
	for npc in npcs:
		if npc.id != actor_id:
			continue
		if not npc.target_id.is_empty() and npc.target_id in [source_id, destination_id]:
			return npc.travel_target_position
		return npc.position
	return Vector3.ZERO


func get_npc_events(npc_id: int, max_count: int = 8) -> Array[EconomicEventRecord]:
	return event_log.get_for_actor(npc_id, max_count)


func get_recent_events(max_count: int = 5) -> Array[EconomicEventRecord]:
	return event_log.get_recent(max_count)


func _on_economic_event_recorded(event: EconomicEventRecord) -> void:
	var learned_records: Array[KnownEventStateRecord] = event_knowledge_system.observe_event(
		event, npcs
	)
	for learned_record in learned_records:
		_apply_new_event_knowledge(learned_record, event)
	economic_event_recorded.emit(event)


func try_communicate_at_shared_activity(speaker_id: int, listener_id: int) -> bool:
	var speaker := _find_npc_by_id(speaker_id)
	var listener := _find_npc_by_id(listener_id)
	if not _can_communicate_at_shared_activity(speaker, listener):
		return false
	var known_event_ids := event_knowledge_system.get_known_event_ids(speaker.id, 0)
	for index in range(known_event_ids.size() - 1, -1, -1):
		var event := event_log.get_by_id(known_event_ids[index])
		if event == null:
			continue
		var learned_record := event_knowledge_system.communicate_event(
			event, speaker.id, listener.id
		)
		if learned_record == null:
			continue
		_apply_new_event_knowledge(learned_record, event)
		event_knowledge_transferred.emit(speaker.id, listener.id, event)
		return true
	return false


func _can_communicate_at_shared_activity(speaker: SimNPC, listener: SimNPC) -> bool:
	if speaker == null or listener == null or speaker.id == listener.id:
		return false
	if speaker.is_dead or listener.is_dead:
		return false
	if (
		speaker.task_state != SimNPC.TASK_STATE_WORKING
		or listener.task_state != SimNPC.TASK_STATE_WORKING
	):
		return false
	if speaker.target_id.is_empty() or speaker.target_id != listener.target_id:
		return false
	if storage_states.has(speaker.target_id):
		return false
	var speaker_action := SimulationDefinitions.get_action(speaker.current_task)
	var listener_action := SimulationDefinitions.get_action(listener.current_task)
	if (
		speaker_action == null
		or listener_action == null
		or speaker_action.target_type != SimulationIds.TARGET_ACTIVITY
		or listener_action.target_type != SimulationIds.TARGET_ACTIVITY
	):
		return false
	return (
		speaker.position.distance_squared_to(listener.position)
		<= KNOWLEDGE_COMMUNICATION_RADIUS * KNOWLEDGE_COMMUNICATION_RADIUS
	)


func _apply_new_event_knowledge(
	known_event: KnownEventStateRecord, event: EconomicEventRecord
) -> void:
	event_knowledge_changed.emit(known_event.get_knower_id(), event)
	var newly_informed_ids: Array[int] = [known_event.get_knower_id()]
	var changed_relationships: Array[RelationshipStateRecord] = relationship_system.apply_event(
		event, npcs, newly_informed_ids
	)
	for relationship in changed_relationships:
		relationship_changed.emit(relationship, event)


func _find_npc_by_id(npc_id: int) -> SimNPC:
	for npc in npcs:
		if npc.id == npc_id:
			return npc
	return null


static func _sort_npcs_by_id(first: SimNPC, second: SimNPC) -> bool:
	return first.id < second.id


func get_primary_relationship(npc_id: int) -> RelationshipStateRecord:
	return relationship_system.get_primary_relationship(npc_id)


func get_relationship_cause(relationship: RelationshipStateRecord) -> EconomicEventRecord:
	if relationship == null:
		return null
	return event_log.get_by_id(relationship.get_last_trust_cause_event_id())


func get_known_events(npc_id: int, max_count: int = 3) -> Array[EconomicEventRecord]:
	var known: Array[EconomicEventRecord] = []
	for event_id in event_knowledge_system.get_known_event_ids(npc_id, max_count):
		var event := event_log.get_by_id(event_id)
		if event != null:
			known.append(event)
	return known


func npc_knows_event(npc_id: int, event_id: int) -> bool:
	return event_knowledge_system.knows_event(npc_id, event_id)


func get_known_event_record(npc_id: int, event_id: int) -> KnownEventStateRecord:
	return event_knowledge_system.get_record(npc_id, event_id)


func get_current_speed() -> String:
	return "%.2fx" % SPEED_LEVELS[speed_index]


func get_resource_rates() -> Dictionary:
	return event_log.get_consumption_rates(tick_count)


func get_pantry() -> StorageStateRecord:
	return economy.get_pantry()


func get_woodpile() -> StorageStateRecord:
	return economy.get_woodpile()


func register_loaded_storage_nodes() -> void:
	for candidate in StorageNode.get_all():
		var node := candidate as StorageNode
		register_storage_node(node)


func register_storage_node(node: StorageNode) -> bool:
	if node == null or node.storage_id.is_empty():
		return false
	var storage_state := storage_states.get(node.storage_id) as StorageStateRecord
	if storage_state == null:
		push_error(
			(
				"SimulationManager: StorageNode '%s' has no authoritative StorageStateRecord"
				% node.storage_id
			)
		)
		return false
	return node.bind_state(storage_state)


func _on_economy_inventory_changed(npc: SimNPC, item_id: StringName, amount: float) -> void:
	npc_inventory_changed.emit(npc, item_id, amount)


func register_loaded_resource_nodes() -> void:
	for node in ResourceNode.get_all():
		register_resource_node(node)


func register_resource_node(node: ResourceNode) -> bool:
	if node == null or node.node_id.is_empty():
		return false
	var action_definition := SimulationDefinitions.get_action(node.action_id)
	if (
		action_definition == null
		or action_definition.target_type != SimulationIds.TARGET_RESOURCE
		or action_definition.resource_action_id != node.action_id
		or node.resource_id not in [SimulationIds.RESOURCE_FOOD, SimulationIds.RESOURCE_WOOD]
	):
		push_error(
			(
				"SimulationManager: ResourceNode '%s' has invalid action/resource IDs '%s'/'%s'"
				% [node.node_id, node.action_id, node.resource_id]
			)
		)
		return false
	var resource_state := get_resource_state(node.node_id)
	if resource_state == null:
		resource_state = ResourceStateRecord.create_from_node(node)
		resource_states[node.node_id] = resource_state
	elif not resource_state.apply_definition(node):
		push_error("SimulationManager: ResourceNode definition mismatch for '%s'" % node.node_id)
		return false
	return node.bind_state(resource_state)


func get_resource_state(node_id: StringName) -> ResourceStateRecord:
	return resource_states.get(node_id) as ResourceStateRecord


func reserve_resource(node_id: StringName, agent_id: int) -> bool:
	var resource_state := get_resource_state(node_id)
	return resource_state != null and resource_state.reserve(agent_id)


func release_resource(node_id: StringName, agent_id: int) -> void:
	var resource_state := get_resource_state(node_id)
	if resource_state != null:
		resource_state.release(agent_id)


func find_resource_node_for_player(from_position: Vector3, max_distance: float) -> ResourceNode:
	var best: ResourceNode
	var best_distance := max_distance * max_distance
	for node in ResourceNode.get_all():
		var resource_state := get_resource_state(node.node_id)
		if (
			resource_state == null
			or not resource_state.can_player_use_resource()
			or not resource_state.can_extract()
		):
			continue
		var storage := economy.get_storage_for_resource(resource_state.get_resource_id())
		if storage == null or storage.get_available_capacity() <= 0.0:
			continue
		var distance := from_position.distance_squared_to(node.interaction_point.global_position)
		if distance <= best_distance:
			best_distance = distance
			best = node
	return best


func harvest_resource_node(node: ResourceNode) -> float:
	if node == null:
		return 0.0
	var resource_state := get_resource_state(node.node_id)
	if resource_state == null or not resource_state.can_player_use_resource():
		return 0.0
	var storage := economy.get_storage_for_resource(resource_state.get_resource_id())
	if storage == null:
		return 0.0
	var extracted := resource_state.extract(
		minf(resource_state.get_yield_per_action(), storage.get_available_capacity())
	)
	if extracted <= 0.0:
		return 0.0

	var deposited := economy.deposit_resource(resource_state.get_resource_id(), extracted)
	var event_position := (
		node.interaction_point.global_position
		if node.interaction_point != null
		else node.global_position
	)
	_record_economic_event_at(
		SimulationIds.EVENT_RESOURCE_EXTRACTED,
		-1,
		resource_state.get_node_id(),
		(
			SimulationIds.STORAGE_VILLAGE_PANTRY
			if resource_state.get_resource_id() == SimulationIds.RESOURCE_FOOD
			else (
				SimulationIds.STORAGE_VILLAGE_WOODPILE
				if resource_state.get_resource_id() == SimulationIds.RESOURCE_WOOD
				else &"village"
			)
		),
		resource_state.get_resource_id(),
		deposited,
		event_position
	)
	if resource_state.get_amount_remaining() <= 0.0:
		_record_narrative_event_at(
			SimulationIds.EVENT_RESOURCE_DEPLETED,
			-1,
			resource_state.get_node_id(),
			"",
			event_position
		)
	village_changed.emit(village)

	if debug_logs:
		print(
			"[SimulationManager] Player extracted ",
			extracted,
			" ",
			resource_state.get_resource_id(),
			" from ",
			resource_state.get_node_id()
		)

	return deposited


func eat_food(amount: float) -> void:
	economy.withdraw_resource(SimulationIds.RESOURCE_FOOD, amount)
	village_changed.emit(village)


func add_safety(amount: float) -> void:
	village.apply_metric_delta(&"safety", amount)
	village_changed.emit(village)


func add_knowledge(amount: float) -> void:
	village.apply_metric_delta(&"knowledge", amount)
	village_changed.emit(village)


func get_starving_count() -> int:
	var count := 0
	for npc in npcs:
		if npc.is_starving:
			count += 1
	return count


func get_state_snapshot() -> Dictionary:
	var npc_snapshots: Array[Dictionary] = []
	for npc in npcs:
		npc_snapshots.append(
			{
				"id": npc.id,
				"name": npc.npc_name,
				"profession": npc.profession,
				"hunger": npc.hunger,
				"energy": npc.energy,
				"strength": npc.strength,
				"intelligence": npc.intelligence,
				"task": npc.current_task,
				"task_state": npc.task_state,
				"task_duration": npc.task_duration,
				"task_progress": npc.task_progress,
				"target_id": String(npc.target_id),
				"position": [npc.position.x, npc.position.y, npc.position.z],
				"travel_target_position":
				[
					npc.travel_target_position.x,
					npc.travel_target_position.y,
					npc.travel_target_position.z
				],
				"has_travel_target": npc.has_travel_target,
				"starvation_ticks": npc.starvation_ticks,
				"is_dead": npc.is_dead
			}
		)

	return {
		"seed": simulation_seed,
		"tick_count": tick_count,
		"village":
		{
			"food": village.food,
			"wood": village.wood,
			"safety": village.safety,
			"knowledge": village.knowledge
		},
		"npcs": npc_snapshots
	}


func get_state_checksum() -> String:
	return create_state_record().to_json().sha256_text()


func get_latest_decision(npc_id: int) -> ActionSelectionResult:
	return latest_decisions.get(npc_id)


func create_state_record() -> SimulationStateRecord:
	var record := SimulationStateRecord.new()
	var wander_streams: Array[Dictionary] = []
	var sorted_npc_ids: Array = wander_random_sources.keys()
	sorted_npc_ids.sort()
	for npc_id in sorted_npc_ids:
		var source: RandomNumberGenerator = wander_random_sources[npc_id]
		wander_streams.append(
			{"npc_id": int(npc_id), "seed": str(source.seed), "state": str(source.state)}
		)

	record.simulation = {
		"seed": simulation_seed,
		"tick_interval": tick_interval,
		"tick_count": tick_count,
		"clock_accumulator": clock.accumulator,
		"clock_elapsed_ticks": clock.elapsed_ticks,
		"wander_random_streams": wander_streams,
		"next_event_id": next_event_id,
		"cycle_duration_seconds": clock.cycle_duration_seconds
	}
	record.village = VillageStateRecord.capture(village)
	for npc in npcs:
		record.npcs.append(NPCStateRecord.capture(npc))

	var sorted_resource_ids: Array = resource_states.keys()
	sorted_resource_ids.sort()
	for resource_id in sorted_resource_ids:
		var resource_state: ResourceStateRecord = resource_states[resource_id]
		record.resources.append(resource_state)
	var sorted_storage_ids: Array = storage_states.keys()
	sorted_storage_ids.sort()
	for storage_id in sorted_storage_ids:
		var storage_state: StorageStateRecord = storage_states[storage_id]
		record.storages.append(storage_state)
	for event in economic_events:
		record.economic_events.append(event)
	for relationship in relationship_system.get_all_sorted():
		record.relationships.append(relationship)
	for known_event in event_knowledge_system.get_all_sorted():
		record.event_knowledge.append(known_event)
	return record


func serialize_state() -> String:
	return create_state_record().to_json()


func restore_state_from_json(json_text: String) -> bool:
	var record := SimulationStateRecord.from_json(json_text)
	if record == null:
		push_error("SimulationManager: refused invalid or unsupported simulation state")
		return false
	return restore_state(record)


func restore_state(record: SimulationStateRecord) -> bool:
	if record == null:
		return false

	simulation_seed = int(record.simulation["seed"])
	tick_interval = float(record.simulation["tick_interval"])
	tick_count = int(record.simulation["tick_count"])
	clock = SimulationClock.new(tick_interval)
	clock.accumulator = float(record.simulation["clock_accumulator"])
	clock.elapsed_ticks = int(record.simulation["clock_elapsed_ticks"])
	clock.cycle_duration_seconds = float(record.simulation.get("cycle_duration_seconds", 240.0))
	village = record.village.restore(debug_logs)
	economy.configure(village, debug_logs)
	economy.restore_storage(record.storages)
	event_log.restore(record.economic_events, int(record.simulation["next_event_id"]))
	latest_decisions.clear()

	npcs.clear()
	for npc_record in record.npcs:
		npcs.append(npc_record.restore(debug_logs))
	relationship_system.restore(record.relationships)
	event_knowledge_system.restore(record.event_knowledge)

	wander_random_sources.clear()
	var wander_streams: Array = record.simulation["wander_random_streams"]
	for stream_data in wander_streams:
		var source := RandomNumberGenerator.new()
		source.seed = String(stream_data["seed"]).to_int()
		source.state = String(stream_data["state"]).to_int()
		wander_random_sources[int(stream_data["npc_id"])] = source

	resource_states.clear()
	for resource_record in record.resources:
		resource_states[resource_record.get_node_id()] = resource_record
	register_loaded_resource_nodes()

	village_changed.emit(village)
	state_restored.emit()
	return true