class_name NpcAvatar
extends CharacterBody3D
## Visual + navigation wrapper around a logic NPCController (ADR-0001).
## Gives the controller a body, color-coded by archetype, and simple movement.

const NPCController := preload("res://src/core/npc_controller.gd")
const Rules := preload("res://src/core/rules.gd")

var npc: NPCController = null
var spawn_position: Vector3 = Vector3.ZERO
var target_position: Vector3 = Vector3.ZERO
var door_position: Vector3 = Vector3(0, 0.5, 1.2)
var awaiting_interaction := false
var arrived := false
var agent: NavigationAgent3D = null
## Set once the nav agent proves it has a path; direct movement is the fallback.
var _nav_usable := false
var _nav_try_frames := 0

const TYPE_COLORS := {
	Rules.NpcType.TOURIST: Color(0.90, 0.75, 0.55),
	Rules.NpcType.PERFORMER: Color(0.80, 0.55, 0.90),
	Rules.NpcType.INFLUENCER: Color(0.95, 0.55, 0.55),
	Rules.NpcType.CONFUSED_VISITOR: Color(0.95, 0.85, 0.50),
	Rules.NpcType.INTOXICATED: Color(0.60, 0.75, 0.50),
	Rules.NpcType.TRESPASSER: Color(0.55, 0.55, 0.75),
	Rules.NpcType.VIOLENT_THREAT: Color(0.85, 0.25, 0.25),
	Rules.NpcType.MENTAL_CRISIS: Color(0.85, 0.65, 0.45),
	Rules.NpcType.AUTHORIZED_STAFF: Color(0.45, 0.70, 0.90),
	Rules.NpcType.AUTHORIZED_GUEST: Color(0.60, 0.85, 0.65),
	Rules.NpcType.DELIVERY: Color(0.80, 0.70, 0.40),
	Rules.NpcType.RESPONDER: Color(0.25, 0.30, 0.85),
	Rules.NpcType.PROTESTER: Color(0.90, 0.40, 0.20),
}

func _init() -> void:
	npc = NPCController.new()

func get_npc_controller() -> NPCController:
	return npc

func setup(profile: NpcProfile, intent: String, seed_value: int, p_spawn: Vector3, p_target: Vector3, p_door: Vector3 = Vector3(0, 0.5, 1.2)) -> void:
	npc.setup("npc_%d" % seed_value, profile, intent, seed_value)
	spawn_position = p_spawn
	target_position = p_target
	door_position = p_door
	position = p_spawn
	npc.fsm.state_changed.connect(_on_state_changed)
	_build_body(profile.npc_type)
	_nav_usable = false
	_nav_try_frames = 0
	agent = NavigationAgent3D.new()
	agent.name = "NavAgent"
	agent.path_desired_distance = 0.4
	agent.target_desired_distance = 4.0
	agent.radius = 0.35
	agent.height = 1.2
	add_child(agent)

	# Normalize intent targets: approach the entrance, stop near the door.
	var collider := CollisionShape3D.new()
	var shape := CapsuleShape3D.new()
	shape.radius = 0.35
	shape.height = 1.6
	collider.shape = shape
	collider.position = Vector3(0, 0.8, 0)
	add_child(collider)

func _build_body(npc_type: int) -> void:
	var body := MeshInstance3D.new()
	var capsule := CapsuleMesh.new()
	capsule.radius = 0.35
	capsule.height = 1.6
	body.mesh = capsule
	var mat := StandardMaterial3D.new()
	mat.albedo_color = TYPE_COLORS.get(npc_type, Color(0.7, 0.7, 0.7))
	body.material_override = mat
	add_child(body)
	var id_tag := MeshInstance3D.new()
	var sphere := SphereMesh.new()
	sphere.radius = 0.12
	sphere.height = 0.24
	var tag_mat := StandardMaterial3D.new()
	tag_mat.albedo_color = Color(1, 1, 1)
	id_tag.mesh = sphere
	id_tag.material_override = tag_mat
	id_tag.position = Vector3(0, 1.05, 0)
	id_tag.scale = Vector3(1, 0.4, 1)
	add_child(id_tag)

func _physics_process(delta: float) -> void:
	if npc == null or npc.fsm == null:
		return
	_advance_fsm(delta)
	_move_toward_target(delta)

func _advance_fsm(delta: float) -> void:
	# Returning-trespasser: an NPC directed away may circle back to the door.
	if npc.tick_return(delta):
		arrived = false
		awaiting_interaction = false
		target_position = door_position
		return
	if npc.leave_requested:
		var away := global_position + (global_position - spawn_position).normalized() * 40.0
		away.y = 0.5
		target_position = away
		return
	if arrived and not awaiting_interaction:
		awaiting_interaction = true

func _move_toward_target(delta: float) -> void:
	if agent == null:
		_move_direct(delta)
		return
	agent.target_position = target_position
	if agent.is_navigation_finished():
		if (global_position - target_position).length() < 3.0:
			_arrive()
		else:
			# Path finished but we are far away: navigation is unusable, fall back.
			_move_direct(delta)
		return
	# Learn whether the navmesh actually serves this spot.
	if not _nav_usable:
		_nav_try_frames += 1
		if agent.is_target_reachable():
			_nav_usable = true
		elif _nav_try_frames > 10:
			_move_direct(delta)
			return
	var next := agent.get_next_path_position()
	var dir := (next - global_position)
	dir.y = 0.0
	if dir.length() < 0.2:
		velocity = Vector3.ZERO
		return
	dir = dir.normalized()
	velocity.x = dir.x * 1.3
	velocity.z = dir.z * 1.3
	velocity.y -= 9.8 * delta
	look_at(global_position + Vector3(dir.x, 0, dir.z), Vector3.UP)
	move_and_slide()

## Fallback used when no navigation mesh is available (e.g. minimal scenes).
func _move_direct(delta: float) -> void:
	var to_target := target_position - global_position
	to_target.y = 0.0
	var dist := to_target.length()
	if dist < 0.7:
		_arrive()
		return
	var dir := to_target.normalized()
	velocity.x = dir.x * 1.3
	velocity.z = dir.z * 1.3
	velocity.y -= 9.8 * delta
	look_at(global_position + Vector3(dir.x, 0, dir.z), Vector3.UP)
	move_and_slide()

func _arrive() -> void:
	arrived = true
	velocity = Vector3.ZERO
	if npc.intent == "enter" or npc.intent == "trespass" or npc.intent == "deliver" or npc.intent == "arrive":
		target_position = door_position
		if (global_position - door_position).length() < 0.8:
			awaiting_interaction = true

func _on_state_changed(_node: Object, _from: String, to_state: String) -> void:
	match to_state:
		"LEAVING":
			npc.leave_requested = true
		"THREATENING", "FORCING_ENTRY":
			# Advance toward the door posture; keep it simple for the prototype.
			pass