extends CharacterBody3D

enum State { WANDER, RAGDOLL }

var _state:         State                   = State.WANDER
var _skeleton:      Skeleton3D              = null
var _sim:           PhysicalBoneSimulator3D = null
var _wander_target: Vector3                 = Vector3.ZERO
var _idle_timer:    float                   = 0.0

@onready var _mesh:     Node3D = $matador_v02
@onready var _hit_area: Area3D = $HitArea


func _ready() -> void:
	add_to_group(&"matador")
	_skeleton = _find_skeleton(_mesh)
	if _skeleton:
		_sim = _setup_physical_bones()
	_hit_area.body_entered.connect(_on_body_entered)
	_pick_wander_target()


func _physics_process(delta: float) -> void:
	if not is_on_floor():
		velocity += get_gravity() * delta
	match _state:
		State.WANDER:  _tick_wander(delta)
		State.RAGDOLL: _tick_ragdoll(delta)


func _tick_wander(delta: float) -> void:
	if _idle_timer > 0.0:
		_idle_timer -= delta
		velocity.x = move_toward(velocity.x, 0.0, 10.0 * delta)
		velocity.z = move_toward(velocity.z, 0.0, 10.0 * delta)
		move_and_slide()
		return

	var dx: float = _wander_target.x - global_position.x
	var dz: float = _wander_target.z - global_position.z
	if Vector2(dx, dz).length() < 0.8:
		_idle_timer = randf_range(DP.f("mat_idle_min"), DP.f("mat_idle_max"))
		_pick_wander_target()
	else:
		var dir := Vector3(dx, 0.0, dz).normalized()
		var spd  := DP.f("mat_walk_speed")
		velocity.x = dir.x * spd
		velocity.z = dir.z * spd
		_mesh.rotation.y = lerp_angle(
			_mesh.rotation.y, atan2(velocity.x, velocity.z), delta * 8.0)
	move_and_slide()


func _tick_ragdoll(delta: float) -> void:
	velocity.x = move_toward(velocity.x, 0.0, 5.0 * delta)
	velocity.z = move_toward(velocity.z, 0.0, 5.0 * delta)
	move_and_slide()


func _on_body_entered(body: Node3D) -> void:
	if _state == State.RAGDOLL:
		return
	if not body.is_in_group(&"player"):
		return
	var player := body as CharacterBody3D
	if player.velocity.length() < DP.f("mat_hit_threshold"):
		return
	var hit_dir := (global_position - player.global_position).normalized()
	_enter_ragdoll(hit_dir, player.velocity.length())


func _enter_ragdoll(hit_dir: Vector3, bull_speed: float) -> void:
	_state = State.RAGDOLL
	hit_dir.y = 0.0
	hit_dir    = hit_dir.normalized()
	velocity   = Vector3(hit_dir.x, 0.5, hit_dir.z) * bull_speed * 0.4

	if not _sim:
		return
	_sim.active = true
	var strength := DP.f("mat_ragdoll_impulse")
	for child: Node in _sim.get_children():
		if child is PhysicalBone3D:
			var scatter := Vector3(
				randf_range(-0.3, 0.3),
				randf_range(0.2, 0.8),
				randf_range(-0.3, 0.3))
			(child as PhysicalBone3D).apply_central_impulse(
				(hit_dir + scatter).normalized() * strength)


func _pick_wander_target() -> void:
	var radius := DP.f("mat_wander_radius")
	var angle  := randf() * TAU
	var dist   := randf_range(2.0, radius)
	_wander_target = Vector3(cos(angle) * dist, 0.0, sin(angle) * dist)


# ── Ragdoll setup ─────────────────────────────────────────────────────────────

func _setup_physical_bones() -> PhysicalBoneSimulator3D:
	for child: Node in _skeleton.get_children():
		if child is PhysicalBoneSimulator3D:
			(child as PhysicalBoneSimulator3D).active = false
			return child as PhysicalBoneSimulator3D

	var sim := PhysicalBoneSimulator3D.new()
	sim.active = false
	_skeleton.add_child(sim)

	# [bone_name, sphere_radius] or [bone_name, capsule_radius, capsule_height]
	const BONES: Array = [
		["matador",    0.18],
		["chest",      0.13, 0.30],
		["head",       0.14],
		["arm_L",      0.07, 0.22],
		["arm_R",      0.07, 0.22],
		["forearm_L",  0.06, 0.22],
		["forearm_R",  0.06, 0.22],
		["leg_L",      0.10, 0.32],
		["leg_R",      0.10, 0.32],
		["shin_L",     0.08, 0.28],
		["shin_R",     0.08, 0.28],
	]

	for entry: Array in BONES:
		var bname: String = entry[0]
		if _skeleton.find_bone(bname) == -1:
			continue
		var pb := PhysicalBone3D.new()
		pb.bone_name    = bname
		pb.linear_damp  = 0.5
		pb.angular_damp = 0.5
		var cs    := CollisionShape3D.new()
		var use_capsule: bool = entry.size() >= 3
		if use_capsule:
			var cap    := CapsuleShape3D.new()
			cap.radius  = entry[1]
			cap.height  = entry[2]
			cs.shape    = cap
		else:
			var sph    := SphereShape3D.new()
			sph.radius  = entry[1]
			cs.shape    = sph
		pb.add_child(cs)
		sim.add_child(pb)

	return sim


# ── Utility ───────────────────────────────────────────────────────────────────

func _find_skeleton(node: Node) -> Skeleton3D:
	if node is Skeleton3D:
		return node as Skeleton3D
	for child: Node in node.get_children():
		var r := _find_skeleton(child)
		if r:
			return r
	return null