class_name GuestRuntime
extends RefCounted

## Authoritative per-guest state.  All scalar simulation values are integers.

enum State {
	SPAWNING,
	ENTERING,
	DECIDING,
	MOVING,
	QUEUING,
	RECEIVING_SERVICE,
	LEAVING,
	DESPAWNING,
	REPLANNING,
	ABANDONING,
	INTERRUPTED,
	FLEEING,
	INCAPACITATED,
}

const NEED_IDS: Array[StringName] = [
	&"hunger",
	&"sleep",
	&"hygiene",
	&"medical",
	&"leisure",
	&"intimacy",
]

var guest_id: StringName = &""
var guest_type_id: StringName = &""
var group_id: StringName = &""
var wallet_gold := 0
var credit_limit_gold := 0
var current_cell := Vector3i.ZERO
var state: State = State.SPAWNING
var state_entered_at := 0
var target_facility_id: StringName = &""
var current_service_id: StringName = &""
var queue_request_id: StringName = &""
var needs: Dictionary = {}
var satisfaction_total := 0
var satisfaction_samples := 0
var patience_remaining := 0
var debt_gold := 0
var suspicion := 0
var addiction_by_tag: Dictionary = {}
var visited_facility_ids: Array[StringName] = []
var path_handle: Variant = null
var planned_exit_at := 0

## Recovery and lifecycle data used by GuestService.
var path_failure_count := 0
var recovery_kind: StringName = &""
var recovery_target_cell := Vector3i.ZERO
var last_progress_cell := Vector3i.ZERO
var last_progress_at := 0
var unresolved_incident_ids: Array[StringName] = []
var outstanding_reservation_ids: Array[StringName] = []
var interrupted_service_ids: Array[StringName] = []
var exit_reason: StringName = &""
var transition_tick := -1
var transitions_this_tick := 0


func configure(
	p_guest_id: StringName,
	p_guest_type_id: StringName,
	options: Dictionary = {}
) -> GuestRuntime:
	guest_id = p_guest_id
	guest_type_id = p_guest_type_id
	group_id = StringName(_value(options, &"group_id", &""))
	wallet_gold = maxi(int(_value(options, &"wallet_gold", 0)), 0)
	credit_limit_gold = maxi(int(_value(options, &"credit_limit_gold", 0)), 0)
	current_cell = _vector3i(_value(options, &"current_cell", Vector3i.ZERO))
	state = _state_from_variant(_value(options, &"state", State.SPAWNING))
	state_entered_at = maxi(int(_value(options, &"state_entered_at", 0)), 0)
	target_facility_id = StringName(_value(options, &"target_facility_id", &""))
	current_service_id = StringName(_value(options, &"current_service_id", &""))
	queue_request_id = StringName(_value(options, &"queue_request_id", &""))
	var normalized_needs: Variant = _normalized_needs(
		_value(options, &"needs", {}),
		true,
		false
	)
	needs = normalized_needs if normalized_needs is Dictionary else {}
	satisfaction_total = maxi(int(_value(options, &"satisfaction_total", 0)), 0)
	satisfaction_samples = maxi(int(_value(options, &"satisfaction_samples", 0)), 0)
	patience_remaining = maxi(int(_value(options, &"patience_remaining", 0)), 0)
	debt_gold = maxi(int(_value(options, &"debt_gold", 0)), 0)
	suspicion = clampi(int(_value(options, &"suspicion", 0)), 0, 100)
	addiction_by_tag = _normalized_clamped_dictionary(
		_value(options, &"addiction_by_tag", {})
	)
	visited_facility_ids = _sorted_unique_names(_value(options, &"visited_facility_ids", []))
	path_handle = _copy(_value(options, &"path_handle", null))
	planned_exit_at = maxi(int(_value(options, &"planned_exit_at", state_entered_at)), state_entered_at)
	path_failure_count = maxi(int(_value(options, &"path_failure_count", 0)), 0)
	recovery_kind = StringName(_value(options, &"recovery_kind", &""))
	recovery_target_cell = _vector3i(_value(options, &"recovery_target_cell", current_cell))
	last_progress_cell = _vector3i(_value(options, &"last_progress_cell", current_cell))
	last_progress_at = maxi(int(_value(options, &"last_progress_at", state_entered_at)), 0)
	unresolved_incident_ids = _sorted_unique_names(
		_value(options, &"unresolved_incident_ids", [])
	)
	outstanding_reservation_ids = _sorted_unique_names(
		_value(options, &"outstanding_reservation_ids", [])
	)
	interrupted_service_ids = _sorted_unique_names(
		_value(options, &"interrupted_service_ids", [])
	)
	exit_reason = StringName(_value(options, &"exit_reason", &""))
	transition_tick = int(_value(options, &"transition_tick", -1))
	transitions_this_tick = maxi(int(_value(options, &"transitions_this_tick", 0)), 0)
	return self


func is_valid() -> bool:
	if guest_id.is_empty() or guest_type_id.is_empty():
		return false
	if wallet_gold < 0 or credit_limit_gold < 0 or debt_gold < 0:
		return false
	if state < State.SPAWNING or state > State.INCAPACITATED:
		return false
	# The planned departure is a deadline, independent of later state transitions.
	# Queue/service completion may legitimately move state_entered_at past it.
	if state_entered_at < 0 or planned_exit_at < 0:
		return false
	if satisfaction_total < 0 or satisfaction_samples < 0 or patience_remaining < 0:
		return false
	if suspicion < 0 or suspicion > 100 or path_failure_count < 0:
		return false
	if transitions_this_tick < 0:
		return false
	if needs.size() != NEED_IDS.size():
		return false
	for need_id: StringName in NEED_IDS:
		if not needs.has(need_id) or not needs[need_id] is int:
			return false
		var value := int(needs[need_id])
		if value < 0 or value > 100:
			return false
	for raw_tag: Variant in addiction_by_tag:
		var addiction := int(addiction_by_tag[raw_tag])
		if StringName(raw_tag).is_empty() or addiction < 0 or addiction > 100:
			return false
	return _state_references_are_valid()


func average_satisfaction() -> int:
	if satisfaction_samples <= 0:
		return 50
	return clampi(satisfaction_total / satisfaction_samples, 0, 100)


func max_addiction() -> int:
	var result := 0
	for value: Variant in addiction_by_tag.values():
		result = maxi(result, int(value))
	return result


func create_snapshot() -> Dictionary:
	return {
		&"guest_id": String(guest_id),
		&"guest_type_id": String(guest_type_id),
		&"group_id": String(group_id),
		&"wallet_gold": wallet_gold,
		&"credit_limit_gold": credit_limit_gold,
		&"current_cell": _cell_to_array(current_cell),
		&"state": State.keys()[state],
		&"state_entered_at": state_entered_at,
		&"target_facility_id": String(target_facility_id),
		&"current_service_id": String(current_service_id),
		&"queue_request_id": String(queue_request_id),
		&"needs": _string_key_dictionary(needs),
		&"satisfaction_total": satisfaction_total,
		&"satisfaction_samples": satisfaction_samples,
		&"patience_remaining": patience_remaining,
		&"debt_gold": debt_gold,
		&"suspicion": suspicion,
		&"addiction_by_tag": _string_key_dictionary(addiction_by_tag),
		&"visited_facility_ids": _names_to_strings(visited_facility_ids),
		&"path_handle": _copy(path_handle),
		&"planned_exit_at": planned_exit_at,
		&"path_failure_count": path_failure_count,
		&"recovery_kind": String(recovery_kind),
		&"recovery_target_cell": _cell_to_array(recovery_target_cell),
		&"last_progress_cell": _cell_to_array(last_progress_cell),
		&"last_progress_at": last_progress_at,
		&"unresolved_incident_ids": _names_to_strings(unresolved_incident_ids),
		&"outstanding_reservation_ids": _names_to_strings(outstanding_reservation_ids),
		&"interrupted_service_ids": _names_to_strings(interrupted_service_ids),
		&"exit_reason": String(exit_reason),
		&"transition_tick": transition_tick,
		&"transitions_this_tick": transitions_this_tick,
	}


static func from_snapshot(snapshot: Dictionary) -> GuestRuntime:
	for array_key: StringName in [
		&"current_cell",
		&"recovery_target_cell",
		&"last_progress_cell",
		&"visited_facility_ids",
		&"unresolved_incident_ids",
		&"outstanding_reservation_ids",
		&"interrupted_service_ids",
	]:
		if not snapshot.get(array_key, null) is Array:
			return null
	if not snapshot.get(&"needs", null) is Dictionary:
		return null
	if not snapshot.get(&"addiction_by_tag", null) is Dictionary:
		return null
	var state_names := State.keys()
	var state_index := state_names.find(String(snapshot.get(&"state", "")))
	if state_index < 0:
		return null
	var runtime := GuestRuntime.new()
	runtime.guest_id = StringName(snapshot.get(&"guest_id", ""))
	runtime.guest_type_id = StringName(snapshot.get(&"guest_type_id", ""))
	runtime.group_id = StringName(snapshot.get(&"group_id", ""))
	runtime.wallet_gold = int(snapshot.get(&"wallet_gold", -1))
	runtime.credit_limit_gold = int(snapshot.get(&"credit_limit_gold", -1))
	runtime.current_cell = _vector3i(snapshot.get(&"current_cell", []))
	runtime.state = state_index as State
	runtime.state_entered_at = int(snapshot.get(&"state_entered_at", -1))
	runtime.target_facility_id = StringName(snapshot.get(&"target_facility_id", ""))
	runtime.current_service_id = StringName(snapshot.get(&"current_service_id", ""))
	runtime.queue_request_id = StringName(snapshot.get(&"queue_request_id", ""))
	var normalized_needs: Variant = _normalized_needs(
		snapshot.get(&"needs", {}),
		false,
		true
	)
	if not normalized_needs is Dictionary:
		return null
	runtime.needs = normalized_needs
	runtime.satisfaction_total = int(snapshot.get(&"satisfaction_total", -1))
	runtime.satisfaction_samples = int(snapshot.get(&"satisfaction_samples", -1))
	runtime.patience_remaining = int(snapshot.get(&"patience_remaining", -1))
	runtime.debt_gold = int(snapshot.get(&"debt_gold", -1))
	runtime.suspicion = int(snapshot.get(&"suspicion", -1))
	runtime.addiction_by_tag = _normalized_clamped_dictionary_strict(
		snapshot.get(&"addiction_by_tag", {})
	)
	runtime.visited_facility_ids = _sorted_unique_names(snapshot.get(&"visited_facility_ids", []))
	runtime.path_handle = _copy(snapshot.get(&"path_handle", null))
	runtime.planned_exit_at = int(snapshot.get(&"planned_exit_at", -1))
	runtime.path_failure_count = int(snapshot.get(&"path_failure_count", -1))
	runtime.recovery_kind = StringName(snapshot.get(&"recovery_kind", ""))
	runtime.recovery_target_cell = _vector3i(snapshot.get(&"recovery_target_cell", []))
	runtime.last_progress_cell = _vector3i(snapshot.get(&"last_progress_cell", []))
	runtime.last_progress_at = int(snapshot.get(&"last_progress_at", -1))
	runtime.unresolved_incident_ids = _sorted_unique_names(
		snapshot.get(&"unresolved_incident_ids", [])
	)
	runtime.outstanding_reservation_ids = _sorted_unique_names(
		snapshot.get(&"outstanding_reservation_ids", [])
	)
	runtime.interrupted_service_ids = _sorted_unique_names(
		snapshot.get(&"interrupted_service_ids", [])
	)
	runtime.exit_reason = StringName(snapshot.get(&"exit_reason", ""))
	runtime.transition_tick = int(snapshot.get(&"transition_tick", -1))
	runtime.transitions_this_tick = int(snapshot.get(&"transitions_this_tick", -1))
	return runtime if runtime.is_valid() else null


func _state_references_are_valid() -> bool:
	if state == State.QUEUING:
		return not target_facility_id.is_empty() and not queue_request_id.is_empty()
	if state == State.RECEIVING_SERVICE:
		return not target_facility_id.is_empty() and not current_service_id.is_empty()
	return true


static func _state_from_variant(value: Variant) -> State:
	if value is String or value is StringName:
		var index := State.keys().find(String(value))
		return index as State if index >= 0 else State.SPAWNING
	var parsed := int(value)
	return parsed as State if parsed >= State.SPAWNING and parsed <= State.INCAPACITATED else State.SPAWNING


static func _normalized_needs(
	source: Variant,
	clamp_values: bool,
	require_all: bool
) -> Variant:
	var result: Dictionary = {}
	if not source is Dictionary:
		return null
	var seen: Dictionary = {}
	for raw_key: Variant in source:
		if not raw_key is String and not raw_key is StringName:
			return null
		var need_id := StringName(raw_key)
		if not NEED_IDS.has(need_id) or seen.has(need_id):
			return null
		var raw_value: Variant = source[raw_key]
		if not raw_value is int:
			return null
		seen[need_id] = true
		result[need_id] = clampi(raw_value, 0, 100) if clamp_values else raw_value
	if require_all and seen.size() != NEED_IDS.size():
		return null
	for need_id: StringName in NEED_IDS:
		if not result.has(need_id):
			result[need_id] = 0
	return result


static func _normalized_clamped_dictionary(source: Variant) -> Dictionary:
	var result: Dictionary = {}
	if not source is Dictionary:
		return result
	var keys: Array = source.keys()
	keys.sort_custom(func(a: Variant, b: Variant) -> bool: return String(a) < String(b))
	for raw_key: Variant in keys:
		var key := StringName(raw_key)
		if not key.is_empty():
			result[key] = clampi(int(source[raw_key]), 0, 100)
	return result


static func _normalized_clamped_dictionary_strict(source: Variant) -> Dictionary:
	var result: Dictionary = {}
	if not source is Dictionary:
		return result
	var keys: Array = source.keys()
	keys.sort_custom(func(a: Variant, b: Variant) -> bool: return String(a) < String(b))
	for raw_key: Variant in keys:
		var key := StringName(raw_key)
		if not key.is_empty():
			result[key] = int(source[raw_key])
	return result


static func _sorted_unique_names(source: Variant) -> Array[StringName]:
	var result: Array[StringName] = []
	if not source is Array:
		return result
	for raw_value: Variant in source:
		var value := StringName(raw_value)
		if not value.is_empty() and not result.has(value):
			result.append(value)
	result.sort_custom(func(a: StringName, b: StringName) -> bool: return String(a) < String(b))
	return result


static func _value(source: Dictionary, key: StringName, fallback: Variant) -> Variant:
	return source.get(key, source.get(String(key), fallback))


static func _vector3i(value: Variant) -> Vector3i:
	if value is Vector3i:
		return value
	if value is Array and value.size() == 3:
		return Vector3i(int(value[0]), int(value[1]), int(value[2]))
	return Vector3i.ZERO


static func _cell_to_array(cell: Vector3i) -> Array[int]:
	return [cell.x, cell.y, cell.z]


static func _names_to_strings(source: Array[StringName]) -> Array[String]:
	var result: Array[String] = []
	for value: StringName in source:
		result.append(String(value))
	return result


static func _string_key_dictionary(source: Dictionary) -> Dictionary:
	var result: Dictionary = {}
	var keys: Array = source.keys()
	keys.sort_custom(func(a: Variant, b: Variant) -> bool: return String(a) < String(b))
	for raw_key: Variant in keys:
		result[String(raw_key)] = source[raw_key]
	return result


static func _copy(value: Variant) -> Variant:
	if value is Array or value is Dictionary:
		return value.duplicate(true)
	return value