extends CharacterBody3D

# Hoof positions in bull local space — dust emitter offsets
const HOOF_OFFSETS: Array = [
	Vector3(-0.30, -0.25, -0.50),
	Vector3( 0.30, -0.25, -0.50),
	Vector3(-0.30, -0.25,  0.60),
	Vector3( 0.30, -0.25,  0.60),
]

# Bull animation clips (Armature|* action names in Assets/bull.fbx). IDLE is the
# looping base pose; the others are one-shot ability clips that return to it.
const _ANIM_IDLE: StringName = &"Armature|IDLE"
const _ANIM_KICK: StringName = &"Armature|KICK"
const _ANIM_SLAM: StringName = &"Armature|SLAM"
const _ANIM_DASH: StringName = &"Armature|DASH"
const _ANIM_ROLL: StringName = &"Armature|ROLL"

@onready var camera_pivot: Node3D = $Camera3D
@onready var cube_guy:     Node3D = $bull

var _hoof_emitters: Array[CPUParticles3D] = []
var _legs: Node

var _was_on_floor: bool         = false
var _pre_slide_vel_y: float     = 0.0

var _slam_ring_mesh: ArrayMesh = null

# Ability system — kick=0, slam=1, dash=2, roll=3
var ability_cd:      Array[float] = [0.0, 0.0, 0.0, 0.0]
var _ability_active: bool         = false
var _ability_timer:  float        = 0.0
var _active_ability: int          = -1
var _dash_dir:       Vector3      = Vector3.ZERO
var _roll_dir:       Vector3      = Vector3.ZERO
var _roll_ramp:      float        = 0.0
var _roll_spin:      float        = 0.0
var _bull_anim:      AnimationPlayer = null

var _slam_pending: bool = false
var _charge_trail_emitter: CPUParticles3D = null
var _roll_spark_emitter:   CPUParticles3D = null
var _cube_scale: Vector3 = Vector3.ONE

# One clean hit ends the run — see take_sword_hit(). The HUD listens for `died`
# to raise the lose screen (the `cause` tags how it happened, for the death notice);
# _dead latches so a flurry of hits fires it only once.
signal died(cause: String)
var _dead: bool = false

var _huff_player:     AudioStreamPlayer   = null
var _crowd_player:    AudioStreamPlayer   = null
var _huff_timer:      float               = 0.0

enum DustState { NONE, WALK, CHARGE }
var _dust_state: DustState = DustState.NONE
var _walk_dust_ramp:   Gradient = null
var _charge_dust_ramp: Gradient = null


func _ready() -> void:
	add_to_group(&"player")
	_cube_scale = cube_guy.scale
	_setup_hoof_dust()
	_setup_legs()
	_setup_charge_trail()
	_setup_roll_sparks()
	_setup_audio()
	_bull_anim = _find_anim_player(cube_guy)
	_setup_bull_idle()
	DP.any_changed.connect(_on_dp_changed)


func _setup_legs() -> void:
	_legs = Node.new()
	_legs.set_script(load("res://bull_legs.gd"))
	add_child(_legs)
	_legs.call(&"setup", self, cube_guy)


func _setup_hoof_dust() -> void:
	var sphere := _particle_sphere(0.10, 4, 2, _unshaded_material())

	_walk_dust_ramp = Gradient.new()
	_walk_dust_ramp.set_color(0, Color(0.80, 0.69, 0.46, 1.0))
	_walk_dust_ramp.set_color(1, Color(0.80, 0.69, 0.46, 0.0))

	# Light blue dust while charging
	_charge_dust_ramp = Gradient.new()
	_charge_dust_ramp.set_color(0, Color(0.20, 0.40, 0.85, 1.0))
	_charge_dust_ramp.set_color(1, Color(0.20, 0.40, 0.85, 0.0))

	var scale_curve := Curve.new()
	scale_curve.add_point(Vector2(0.0, 0.2))
	scale_curve.add_point(Vector2(0.4, 1.0))
	scale_curve.add_point(Vector2(1.0, 0.0))

	for offset: Vector3 in HOOF_OFFSETS:
		var p := CPUParticles3D.new()
		p.position = offset
		p.emitting = false
		p.amount = 12
		p.lifetime = DP.f("dust_lifetime")
		p.explosiveness = DP.f("dust_explosiveness")
		p.randomness = 0.6
		p.local_coords = false
		p.direction = Vector3(0.0, 1.0, 0.0)
		p.spread = DP.f("dust_spread")
		p.gravity = Vector3(0.0, DP.f("dust_gravity_y"), 0.0)
		p.initial_velocity_min = DP.f("walk_vel_min")
		p.initial_velocity_max = DP.f("walk_vel_max")
		p.scale_amount_min = DP.f("walk_scale_min")
		p.scale_amount_max = DP.f("walk_scale_max")
		p.mesh = sphere
		p.color_ramp = _walk_dust_ramp
		p.scale_amount_curve = scale_curve
		cube_guy.add_child(p)
		_hoof_emitters.append(p)


func _setup_charge_trail() -> void:
	# Blue energy trail — streams backward during a fast run / roll
	var trail_sphere := _particle_sphere(0.065, 4, 2, _unshaded_material())

	var trail_ramp := Gradient.new()
	trail_ramp.set_color(0, Color(0.30, 0.65, 1.0, 1.0))
	trail_ramp.set_color(1, Color(0.30, 0.65, 1.0, 0.0))

	var trail_scale := Curve.new()
	trail_scale.add_point(Vector2(0.0, 1.0))
	trail_scale.add_point(Vector2(0.6, 0.8))
	trail_scale.add_point(Vector2(1.0, 0.0))

	_charge_trail_emitter = CPUParticles3D.new()
	_charge_trail_emitter.position = Vector3(0.0, 0.25, 0.3)
	_charge_trail_emitter.emitting = false
	_charge_trail_emitter.one_shot = false
	_charge_trail_emitter.amount = 18
	_charge_trail_emitter.lifetime = 0.30
	_charge_trail_emitter.randomness = 0.4
	_charge_trail_emitter.local_coords = false
	_charge_trail_emitter.direction = Vector3(0.0, 0.2, 1.0).normalized()
	_charge_trail_emitter.spread = 25.0
	_charge_trail_emitter.gravity = Vector3(0.0, 2.0, 0.0)
	_charge_trail_emitter.initial_velocity_min = 4.0
	_charge_trail_emitter.initial_velocity_max = 9.0
	_charge_trail_emitter.scale_amount_min = 0.4
	_charge_trail_emitter.scale_amount_max = 1.2
	_charge_trail_emitter.mesh = trail_sphere
	_charge_trail_emitter.color_ramp = trail_ramp
	_charge_trail_emitter.scale_amount_curve = trail_scale
	cube_guy.add_child(_charge_trail_emitter)


func _setup_roll_sparks() -> void:
	# Rammus Powerball ground spray — dirt/sparks flung outward from the spinning
	# ball. World-space (local_coords off) so they peel off into a trail behind it.
	var spark := _particle_sphere(0.05, 4, 2, _unshaded_material())

	var ramp := Gradient.new()
	ramp.set_color(0, Color(1.00, 0.78, 0.32, 1.0))
	ramp.set_color(1, Color(0.70, 0.42, 0.14, 0.0))

	var sc := Curve.new()
	sc.add_point(Vector2(0.0, 0.30))
	sc.add_point(Vector2(0.3, 1.00))
	sc.add_point(Vector2(1.0, 0.00))

	_roll_spark_emitter = CPUParticles3D.new()
	_roll_spark_emitter.position = Vector3(0.0, 0.10, 0.0)
	_roll_spark_emitter.emitting = false
	_roll_spark_emitter.one_shot = false
	_roll_spark_emitter.amount = 46
	_roll_spark_emitter.lifetime = 0.45
	_roll_spark_emitter.randomness = 0.7
	_roll_spark_emitter.local_coords = false
	_roll_spark_emitter.direction = Vector3(0.0, 1.0, 0.0)
	_roll_spark_emitter.spread = 180.0
	_roll_spark_emitter.gravity = Vector3(0.0, -6.0, 0.0)
	_roll_spark_emitter.initial_velocity_min = 3.0
	_roll_spark_emitter.initial_velocity_max = 8.0
	_roll_spark_emitter.scale_amount_min = 0.5
	_roll_spark_emitter.scale_amount_max = 1.3
	_roll_spark_emitter.mesh = spark
	_roll_spark_emitter.color_ramp = ramp
	_roll_spark_emitter.scale_amount_curve = sc
	cube_guy.add_child(_roll_spark_emitter)


func _setup_audio() -> void:
	if ResourceLoader.exists("res://sounds/bull_huff.ogg"):
		_huff_player = AudioStreamPlayer.new()
		_huff_player.stream = load("res://sounds/bull_huff.ogg")
		_huff_player.volume_db = 0.0
		add_child(_huff_player)
	if ResourceLoader.exists("res://sounds/crowd_ambient.ogg"):
		_crowd_player = AudioStreamPlayer.new()
		var s := load("res://sounds/crowd_ambient.ogg") as AudioStreamOggVorbis
		if s:
			s.loop = true
		_crowd_player.stream = s
		_crowd_player.volume_db = -14.0
		_crowd_player.autoplay = true
		add_child(_crowd_player)


func _set_dust_state(new_state: DustState) -> void:
	if new_state == _dust_state:
		return
	_dust_state = new_state
	for p: CPUParticles3D in _hoof_emitters:
		p.lifetime = DP.f("dust_lifetime")
		p.explosiveness = DP.f("dust_explosiveness")
		p.spread = DP.f("dust_spread")
		p.gravity = Vector3(0.0, DP.f("dust_gravity_y"), 0.0)
		match new_state:
			DustState.NONE:
				p.emitting = false
			DustState.WALK:
				p.color_ramp = _walk_dust_ramp
				p.scale_amount_min = DP.f("walk_scale_min")
				p.scale_amount_max = DP.f("walk_scale_max")
				p.initial_velocity_min = DP.f("walk_vel_min")
				p.initial_velocity_max = DP.f("walk_vel_max")
				p.emitting = true
			DustState.CHARGE:
				p.color_ramp = _charge_dust_ramp
				p.scale_amount_min = DP.f("charge_scale_min")
				p.scale_amount_max = DP.f("charge_scale_max")
				p.initial_velocity_min = DP.f("charge_vel_min")
				p.initial_velocity_max = DP.f("charge_vel_max")
				p.emitting = true
	if _charge_trail_emitter:
		_charge_trail_emitter.emitting = _dust_state == DustState.CHARGE


func _on_dp_changed(_key: String, _val: Variant) -> void:
	if _hoof_emitters.is_empty() or _dust_state == DustState.NONE:
		return
	var prev := _dust_state
	_dust_state = DustState.NONE
	_set_dust_state(prev)


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


# IDLE ships one-shot; make it loop and start it so the bull breathes at rest
# instead of freezing on a bind pose. It's the base every ability blends back to.
func _setup_bull_idle() -> void:
	if _bull_anim == null:
		return
	# IDLE and ROLL both loop as continuous states; the ability clips are one-shot.
	for clip: StringName in [_ANIM_IDLE, _ANIM_ROLL]:
		if _bull_anim.has_animation(clip):
			_bull_anim.get_animation(clip).loop_mode = Animation.LOOP_LINEAR
	_play_idle()


# Return to the looping idle (and undo any ability speed-scale). Cross-fades so a
# finishing ability clip eases back to idle instead of snapping.
func _play_idle() -> void:
	if _bull_anim == null:
		return
	_bull_anim.speed_scale = 1.0
	if _bull_anim.has_animation(_ANIM_IDLE):
		_bull_anim.play(_ANIM_IDLE, 0.2)


func _unhandled_input(event: InputEvent) -> void:
	# Abilities can be chained: a new one interrupts whatever is currently
	# active, gated only by each ability's own cooldown.
	if event.is_action_pressed(&"ability_kick") and ability_cd[0] <= 0.0:
		_activate_kick()
	elif event.is_action_pressed(&"ability_slam") and ability_cd[1] <= 0.0:
		_activate_slam()
	elif event.is_action_pressed(&"ability_dash") and ability_cd[2] <= 0.0:
		_activate_dash()
	elif event.is_action_pressed(&"ability_roll") and ability_cd[3] <= 0.0:
		_activate_roll()


func ability_cooldown_fraction(slot: int) -> float:
	var maxcd := 0.0
	match slot:
		0: maxcd = DP.f("kick_cooldown")
		1: maxcd = DP.f("slam_cooldown")
		2: maxcd = DP.f("dash_cooldown")
		3: maxcd = DP.f("roll_cooldown")
	return ability_cd[slot] / maxcd if maxcd > 0.0 else 0.0


func ability_cooldown_remaining(slot: int) -> float:
	return ability_cd[slot]


func _activate_kick() -> void:
	ability_cd[0]   = DP.f("kick_cooldown")
	_ability_active = true
	_active_ability = 0
	_ability_timer  = 0.6
	if _bull_anim:
		_bull_anim.speed_scale = 1.0
	if _bull_anim and _bull_anim.has_animation(_ANIM_KICK):
		_bull_anim.play(_ANIM_KICK)
		_ability_timer = _bull_anim.get_animation(_ANIM_KICK).length
	var raw  := cube_guy.global_transform.basis.z
	var back := -Vector3(raw.x, 0.0, raw.z).normalized()
	_spawn_kick_fx(back)
	get_tree().create_timer(0.2).timeout.connect(
		func() -> void: _hit_matadors_cone(DP.f("kick_range"), deg_to_rad(85.0), DP.f("kick_strength"), back)
	)


func _activate_slam() -> void:
	ability_cd[1]   = DP.f("slam_cooldown")
	_ability_active = true
	_active_ability = 1
	_legs.set(&"tail_ragdoll", true)
	_slam_pending = true
	var jump_vel  := DP.f("slam_jump_velocity")
	velocity.y     = jump_vel
	# Airtime with an accelerated descent: rise (v/g) + fall (v / (g·√mult)).
	var fall_mult := maxf(DP.f("slam_fall_mult"), 0.01)
	var air_time  := (jump_vel / 9.8) * (1.0 + 1.0 / sqrt(fall_mult))
	_ability_timer = air_time + 0.3
	if _bull_anim and _bull_anim.has_animation(_ANIM_SLAM):
		var anim_len := _bull_anim.get_animation(_ANIM_SLAM).length
		_bull_anim.speed_scale = anim_len / maxf(air_time, 0.01)
		_bull_anim.play(_ANIM_SLAM)


func _activate_dash() -> void:
	ability_cd[2]   = DP.f("dash_cooldown")
	_ability_active = true
	_active_ability = 2
	_ability_timer  = 0.45
	if _bull_anim:
		_bull_anim.speed_scale = 1.0
	if _bull_anim and _bull_anim.has_animation(_ANIM_DASH):
		_bull_anim.play(_ANIM_DASH)
		_ability_timer = _bull_anim.get_animation(_ANIM_DASH).length
	var raw := cube_guy.global_transform.basis.z
	_dash_dir = Vector3(raw.x, 0.0, raw.z).normalized()
	velocity.x = _dash_dir.x * DP.f("dash_speed")
	velocity.z = _dash_dir.z * DP.f("dash_speed")
	_spawn_dash_burst()
	_legs.set(&"charge_pitch_target", DP.f("charge_head_pitch"))
	if _huff_player:
		_huff_player.pitch_scale = randf_range(0.9, 1.1)
		_huff_player.play()


func _activate_roll() -> void:
	ability_cd[3]   = DP.f("roll_cooldown")
	_ability_active = true
	_active_ability = 3
	_ability_timer  = DP.f("roll_duration")
	_roll_ramp      = 0.0
	_roll_spin      = 0.0
	# Curl into the ball along the current heading (or facing when standing still)
	# and launch at the base speed — it ramps up from here the longer you roll.
	var flat := Vector3(velocity.x, 0.0, velocity.z)
	if flat.length() > 1.0:
		_roll_dir = flat.normalized()
	else:
		var f := cube_guy.global_transform.basis.z
		_roll_dir = Vector3(f.x, 0.0, f.z).normalized()
	var launch := DP.f("roll_base_speed")
	velocity.x = _roll_dir.x * launch
	velocity.z = _roll_dir.z * launch
	if _bull_anim and _bull_anim.has_animation(_ANIM_ROLL):
		_bull_anim.speed_scale = 1.0
		_bull_anim.play(_ANIM_ROLL)
	_legs.set(&"tail_ragdoll", true)                           # tail streams out behind
	_legs.set(&"charge_pitch_target", DP.f("charge_head_pitch"))  # horns down, plowing
	_legs.set(&"external_rotation", true)   # roll owns the model's full orientation (tumble)
	if _roll_spark_emitter:
		_roll_spark_emitter.emitting = true
	_spawn_dash_burst()
	camera_pivot.call(&"trigger_hit", 0.35)
	if _huff_player:
		_huff_player.pitch_scale = randf_range(0.8, 1.0)
		_huff_player.play()


# One rolling frame (Rammus Powerball): steer with momentum, accelerate the longer
# the roll lasts, move (walls just slide), then pop the ball on the first matador we
# ram. Fully replaces the normal locomotion path while active.
func _tick_roll(delta: float, steer: Vector3) -> void:
	var steer_flat := Vector3(steer.x, 0.0, steer.z)
	if steer_flat.length() > 0.1:
		var t := clampf(DP.f("roll_turn") * delta, 0.0, 1.0)
		_roll_dir = _roll_dir.slerp(steer_flat.normalized(), t).normalized()

	# Speed builds over time: base → max across roll_rampup_time, so a long roll
	# winds up into a runaway boulder while a quick tap barely gets going.
	_roll_ramp += delta
	var ramp := clampf(_roll_ramp / maxf(DP.f("roll_rampup_time"), 0.01), 0.0, 1.0)
	var top := DP.f("roll_max_speed")
	var speed := lerpf(DP.f("roll_base_speed"), top, ramp)
	velocity.x = _roll_dir.x * speed
	velocity.z = _roll_dir.z * speed

	# Tumble the whole model like a Powerball: face the travel direction (yaw) then
	# spin forward about the horizontal axis perpendicular to it, angular speed = v/r
	# so it "rolls" without slipping. Legs yield rotation control while active.
	var radius := maxf(DP.f("roll_spin_radius"), 0.1)
	_roll_spin = wrapf(_roll_spin + (speed / radius) * delta, 0.0, TAU)
	var facing := Basis(Vector3.UP, atan2(_roll_dir.x, _roll_dir.z))
	var tumble_axis := Vector3.UP.cross(_roll_dir).normalized()
	cube_guy.basis = (Basis(tumble_axis, _roll_spin) * facing).scaled(_cube_scale)
	if _bull_anim and _bull_anim.has_animation(_ANIM_ROLL):
		_bull_anim.speed_scale = clampf(speed / maxf(top, 1.0), 0.6, 2.4)

	_set_dust_state(DustState.CHARGE)
	if _charge_trail_emitter:
		_charge_trail_emitter.direction = (-_roll_dir + Vector3(0.0, 0.25, 0.0)).normalized()

	move_and_slide()
	_was_on_floor = is_on_floor()
	_roll_try_pop(speed)


# Pop the ball on ramming a matador: launch every matador in the hit radius up and
# outward, then end the roll (Rammus stops when Powerball connects). Returns true if
# it popped so the caller can stop touching roll state this frame.
func _roll_try_pop(speed: float) -> bool:
	var radius := DP.f("roll_hit_radius")
	for mat: Node in get_tree().get_nodes_in_group(&"matador"):
		var to_mat: Vector3 = (mat as Node3D).global_position - global_position
		to_mat.y = 0.0
		if to_mat.length() > radius:
			continue
		_hit_matadors_radius(radius, DP.f("roll_hit_strength"), DP.f("roll_knockup"))
		camera_pivot.call(&"trigger_hit", clampf(speed / 90.0, 0.35, 1.0))
		if _huff_player:
			_huff_player.pitch_scale = randf_range(1.05, 1.35)
			_huff_player.play()
		_end_roll()
		return true
	return false


# End the Powerball early: brake hard (the ball "pops" and unrolls) and drop back to
# the normal locomotion path next frame.
func _end_roll() -> void:
	_ability_active = false
	_active_ability = -1
	_ability_timer  = 0.0
	_roll_ramp      = 0.0
	_legs.set(&"charge_pitch_target", 0.0)
	_legs.set(&"tail_ragdoll", false)
	_legs.set(&"external_rotation", false)
	if _roll_spark_emitter:
		_roll_spark_emitter.emitting = false
	velocity.x *= 0.15
	velocity.z *= 0.15
	_play_idle()


func _hit_matadors_cone(range_m: float, half_angle_rad: float, strength: float,
		dir: Vector3 = Vector3.ZERO) -> void:
	var raw     := cube_guy.global_transform.basis.z
	var forward := dir if dir.length_squared() > 0.01 else Vector3(raw.x, 0.0, raw.z).normalized()
	for mat: Node in get_tree().get_nodes_in_group(&"matador"):
		var to_mat: Vector3 = (mat as Node3D).global_position - global_position
		to_mat.y = 0.0
		var dist := to_mat.length()
		if dist > range_m:
			continue
		if dist > 0.01 and forward.dot(to_mat / dist) < cos(half_angle_rad):
			continue
		mat.call(&"apply_ability_hit", (forward + Vector3.UP * 0.4).normalized(), strength)


func _hit_matadors_radius(range_m: float, strength: float, up_boost: float = 0.0) -> void:
	for mat: Node in get_tree().get_nodes_in_group(&"matador"):
		var to_mat: Vector3 = (mat as Node3D).global_position - global_position
		to_mat.y = 0.0
		var dist := to_mat.length()
		if dist > range_m:
			continue
		var away := to_mat / dist if dist > 0.01 \
			else Vector3(randf() - 0.5, 0.0, randf() - 0.5).normalized()
		mat.call(&"apply_ability_hit", (away + Vector3.UP * 0.6).normalized(), strength, up_boost)


# ── Particle helpers ──────────────────────────────────────────────────────────
# All FX in this script use unshaded, vertex-coloured, alpha-blended particles;
# these three helpers remove the boilerplate each spawn function used to repeat.

func _unshaded_material() -> StandardMaterial3D:
	var mat := StandardMaterial3D.new()
	mat.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
	mat.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
	mat.vertex_color_use_as_albedo = true
	mat.cull_mode = BaseMaterial3D.CULL_DISABLED
	return mat


# Low-poly sphere sized for a particle mesh (height is always the diameter).
func _particle_sphere(radius: float, segments: int, rings: int, mat: Material) -> SphereMesh:
	var sphere := SphereMesh.new()
	sphere.radius = radius
	sphere.height = radius * 2.0
	sphere.radial_segments = segments
	sphere.rings = rings
	sphere.material = mat
	return sphere


# Queue-free a transient FX node once its particles have finished.
func _free_after(node: Node, delay: float) -> void:
	get_tree().create_timer(delay).timeout.connect(func() -> void:
		if is_instance_valid(node):
			node.queue_free()
	)


func _spawn_slam_fx() -> void:
	if not _slam_ring_mesh:
		_slam_ring_mesh = _make_slam_ring_mesh()
	var max_r  := DP.f("slam_range")
	var origin := global_position + Vector3(0.0, -0.5, 0.0)
	_launch_slam_ring(origin, max_r, 0.00, 0.55, Color(1.00, 0.70, 0.10, 0.85))
	_launch_slam_ring(origin, max_r, 0.10, 0.52, Color(1.00, 0.50, 0.10, 0.65))
	_launch_slam_ring(origin, max_r, 0.20, 0.48, Color(0.90, 0.30, 0.10, 0.50))
	_spawn_slam_dust(origin)
	camera_pivot.call(&"trigger_hit", 0.60)


func _launch_slam_ring(origin: Vector3, max_r: float,
		delay: float, duration: float, col: Color) -> void:
	var mat := StandardMaterial3D.new()
	mat.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
	mat.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
	mat.albedo_color = Color(col.r, col.g, col.b, 0.0)
	mat.cull_mode    = BaseMaterial3D.CULL_DISABLED

	var mi := MeshInstance3D.new()
	mi.mesh              = _slam_ring_mesh
	mi.material_override = mat
	mi.scale             = Vector3(0.02, 1.0, 0.02)
	get_parent().add_child(mi)
	mi.global_position   = origin

	var tween := create_tween()
	tween.set_parallel(true)
	tween.tween_property(mi, "scale",
			Vector3(max_r, 1.0, max_r), duration)\
		.set_delay(delay)\
		.set_trans(Tween.TRANS_EXPO)\
		.set_ease(Tween.EASE_OUT)
	var fade := func(a: float) -> void: mat.albedo_color.a = a
	tween.tween_method(fade, col.a, 0.0, duration)\
		.set_delay(delay)\
		.set_trans(Tween.TRANS_SINE)\
		.set_ease(Tween.EASE_IN)
	tween.tween_callback(mi.queue_free).set_delay(delay + duration + 0.05)


func _spawn_slam_dust(origin: Vector3) -> void:
	var sphere := _particle_sphere(0.09, 4, 2, _unshaded_material())

	var ramp := Gradient.new()
	ramp.set_color(0, Color(0.88, 0.74, 0.46, 1.0))
	ramp.set_color(1, Color(0.88, 0.74, 0.46, 0.0))

	var scale_curve := Curve.new()
	scale_curve.add_point(Vector2(0.0, 0.25))
	scale_curve.add_point(Vector2(0.35, 1.6))
	scale_curve.add_point(Vector2(1.00, 0.0))

	var p := CPUParticles3D.new()
	p.one_shot             = true
	p.explosiveness        = 0.85
	p.amount               = 48
	p.lifetime             = 1.1
	p.randomness           = 0.5
	p.local_coords         = false
	p.direction            = Vector3.UP
	p.spread               = 85.0
	p.gravity              = Vector3(0.0, -7.0, 0.0)
	p.initial_velocity_min = 3.5
	p.initial_velocity_max = 10.0
	p.scale_amount_min     = 0.5
	p.scale_amount_max     = 2.0
	p.mesh                 = sphere
	p.color_ramp           = ramp
	p.scale_amount_curve   = scale_curve
	get_parent().add_child(p)
	p.global_position = origin
	p.restart()
	_free_after(p, 2.5)


func _spawn_kick_fx(back_dir: Vector3) -> void:
	var origin := global_position + back_dir * 0.55 + Vector3(0.0, -0.25, 0.0)
	_spawn_kick_dust(origin, back_dir)
	_spawn_kick_stones(origin, back_dir)
	_spawn_kick_sparks(origin, back_dir)
	_spawn_kick_flash(origin)
	camera_pivot.call(&"trigger_hit", 0.35)


func _spawn_kick_dust(origin: Vector3, back_dir: Vector3) -> void:
	var sphere := _particle_sphere(0.12, 4, 2, _unshaded_material())

	var ramp := Gradient.new()
	ramp.set_color(0, Color(1.0, 0.78, 0.18, 0.95))
	ramp.set_color(1, Color(1.0, 0.45, 0.05, 0.0))

	var scale_curve := Curve.new()
	scale_curve.add_point(Vector2(0.0, 0.3))
	scale_curve.add_point(Vector2(0.3, 1.5))
	scale_curve.add_point(Vector2(1.0, 0.0))

	var p := CPUParticles3D.new()
	p.one_shot             = true
	p.explosiveness        = 0.80
	p.amount               = 40
	p.lifetime             = 1.2
	p.randomness           = 0.5
	p.local_coords         = false
	p.direction            = (back_dir + Vector3(0.0, 0.7, 0.0)).normalized()
	p.spread               = 65.0
	p.gravity              = Vector3(0.0, -6.0, 0.0)
	p.initial_velocity_min = 3.0
	p.initial_velocity_max = 9.0
	p.scale_amount_min     = 0.5
	p.scale_amount_max     = 2.2
	p.mesh                 = sphere
	p.color_ramp           = ramp
	p.scale_amount_curve   = scale_curve
	get_parent().add_child(p)
	p.global_position = origin
	p.restart()
	_free_after(p, 2.5)


func _spawn_kick_stones(origin: Vector3, back_dir: Vector3) -> void:
	var sphere := _particle_sphere(0.055, 3, 1, _unshaded_material())

	var ramp := Gradient.new()
	ramp.set_color(0, Color(0.62, 0.58, 0.52, 1.0))
	ramp.set_color(1, Color(0.62, 0.58, 0.52, 0.0))

	var scale_curve := Curve.new()
	scale_curve.add_point(Vector2(0.0, 1.0))
	scale_curve.add_point(Vector2(0.6, 1.0))
	scale_curve.add_point(Vector2(1.0, 0.0))

	var p := CPUParticles3D.new()
	p.one_shot             = true
	p.explosiveness        = 0.92
	p.amount               = 14
	p.lifetime             = 0.65
	p.randomness           = 0.6
	p.local_coords         = false
	p.direction            = (back_dir + Vector3(0.0, 0.35, 0.0)).normalized()
	p.spread               = 45.0
	p.gravity              = Vector3(0.0, -9.8, 0.0)
	p.initial_velocity_min = 5.0
	p.initial_velocity_max = 14.0
	p.scale_amount_min     = 0.5
	p.scale_amount_max     = 1.8
	p.mesh                 = sphere
	p.color_ramp           = ramp
	p.scale_amount_curve   = scale_curve
	get_parent().add_child(p)
	p.global_position = origin
	p.restart()
	_free_after(p, 2.0)


func _spawn_kick_flash(origin: Vector3) -> void:
	var mat := _unshaded_material()
	mat.albedo_color = Color(1.0, 0.97, 0.40, 0.0)

	var sphere := _particle_sphere(1.0, 8, 4, mat)

	var mi := MeshInstance3D.new()
	mi.mesh              = sphere
	mi.material_override = mat
	mi.scale             = Vector3(0.05, 0.05, 0.05)
	get_parent().add_child(mi)
	mi.global_position = origin

	var tween := create_tween()
	tween.set_parallel(true)
	tween.tween_property(mi, "scale", Vector3(0.7, 0.7, 0.7), 0.13)\
		.set_trans(Tween.TRANS_EXPO).set_ease(Tween.EASE_OUT)
	var fade := func(a: float) -> void: mat.albedo_color.a = a
	tween.tween_method(fade, 0.92, 0.0, 0.14)\
		.set_trans(Tween.TRANS_SINE).set_ease(Tween.EASE_IN)
	tween.tween_callback(mi.queue_free).set_delay(0.16)


func _spawn_dash_burst() -> void:
	var box := BoxMesh.new()
	box.size = Vector3(0.045, 0.045, 0.30)
	box.material = _unshaded_material()

	var ramp := Gradient.new()
	ramp.set_color(0, Color(0.50, 0.82, 1.0, 1.0))
	ramp.set_color(1, Color(0.50, 0.82, 1.0, 0.0))

	var scale_curve := Curve.new()
	scale_curve.add_point(Vector2(0.0, 1.0))
	scale_curve.add_point(Vector2(1.0, 0.0))

	var p := CPUParticles3D.new()
	p.one_shot             = true
	p.explosiveness        = 0.92
	p.amount               = 18
	p.lifetime             = 0.22
	p.randomness           = 0.15
	p.local_coords         = false
	p.direction            = _dash_dir
	p.spread               = 15.0
	p.gravity              = Vector3.ZERO
	p.initial_velocity_min = 18.0
	p.initial_velocity_max = 35.0
	p.scale_amount_min     = 0.8
	p.scale_amount_max     = 2.8
	p.mesh                 = box
	p.color_ramp           = ramp
	p.scale_amount_curve   = scale_curve
	get_parent().add_child(p)
	p.global_position = global_position + Vector3(0.0, 0.2, 0.0)
	p.restart()
	_free_after(p, 0.6)


func _spawn_kick_sparks(origin: Vector3, back_dir: Vector3) -> void:
	var sphere := _particle_sphere(0.04, 3, 1, _unshaded_material())

	var ramp := Gradient.new()
	ramp.set_color(0, Color(1.0, 0.98, 0.60, 1.0))
	ramp.set_color(1, Color(1.0, 1.0, 1.0, 0.0))

	var scale_curve := Curve.new()
	scale_curve.add_point(Vector2(0.0, 1.0))
	scale_curve.add_point(Vector2(0.5, 0.6))
	scale_curve.add_point(Vector2(1.0, 0.0))

	var p := CPUParticles3D.new()
	p.one_shot             = true
	p.explosiveness        = 0.95
	p.amount               = 22
	p.lifetime             = 0.28
	p.randomness           = 0.4
	p.local_coords         = false
	p.direction            = (back_dir + Vector3(0.0, 0.5, 0.0)).normalized()
	p.spread               = 30.0
	p.gravity              = Vector3(0.0, -14.0, 0.0)
	p.initial_velocity_min = 8.0
	p.initial_velocity_max = 18.0
	p.scale_amount_min     = 0.6
	p.scale_amount_max     = 2.0
	p.mesh                 = sphere
	p.color_ramp           = ramp
	p.scale_amount_curve   = scale_curve
	get_parent().add_child(p)
	p.global_position = origin
	p.restart()
	_free_after(p, 1.0)


func _make_slam_ring_mesh() -> ArrayMesh:
	const INNER_R:  float = 0.82
	const OUTER_R:  float = 1.00
	const SEGMENTS: int   = 48

	var verts   := PackedVector3Array()
	var indices := PackedInt32Array()

	for i: int in SEGMENTS:
		var a0 := i       / float(SEGMENTS) * TAU
		var a1 := (i + 1) / float(SEGMENTS) * TAU
		var vi := i * 4
		verts.append(Vector3(cos(a0) * INNER_R, 0.0, sin(a0) * INNER_R))
		verts.append(Vector3(cos(a0) * OUTER_R, 0.0, sin(a0) * OUTER_R))
		verts.append(Vector3(cos(a1) * OUTER_R, 0.0, sin(a1) * OUTER_R))
		verts.append(Vector3(cos(a1) * INNER_R, 0.0, sin(a1) * INNER_R))
		indices.append_array([vi, vi + 2, vi + 1, vi, vi + 3, vi + 2])

	var arrays: Array = []
	arrays.resize(Mesh.ARRAY_MAX)
	arrays[Mesh.ARRAY_VERTEX] = verts
	arrays[Mesh.ARRAY_INDEX]  = indices

	var mesh := ArrayMesh.new()
	mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES, arrays)
	return mesh


func _physics_process(delta: float) -> void:
	# ── Gravity ───────────────────────────────────────────────────────────────
	if not is_on_floor():
		var gravity := get_gravity()
		# Crash a slam down hard: full leap on the way up, accelerated descent so
		# the bull spends less time floating before the impact.
		if _slam_pending and velocity.y < 0.0:
			gravity *= DP.f("slam_fall_mult")
		velocity += gravity * delta

	# ── Camera-relative input direction ───────────────────────────────────────
	var input_dir    := Input.get_vector("move_left", "move_right", "move_forward", "move_back")
	var cam_basis    := camera_pivot.global_transform.basis
	var flat_forward := -Vector3(cam_basis.z.x, 0.0, cam_basis.z.z).normalized()
	var flat_right   :=  Vector3(cam_basis.x.x, 0.0, cam_basis.x.z).normalized()
	var direction    := (flat_forward * -input_dir.y + flat_right * input_dir.x).normalized()

	var on_floor := is_on_floor()

	# ── Ability cooldowns ────────────────────────────────────────────────────────
	for i: int in 4:
		ability_cd[i] = maxf(0.0, ability_cd[i] - delta)
	if _ability_active:
		_ability_timer -= delta
		if _ability_timer <= 0.0:
			if _active_ability == 3:
				_end_roll()   # tears down roll-specific state (sparks, tumble control)
			else:
				_ability_active = false
				_active_ability = -1
				_legs.set(&"charge_pitch_target", 0.0)
				_legs.set(&"tail_ragdoll", false)
				_slam_pending = false
				_play_idle()

	# ── Boulder roll ──────────────────────────────────────────────────────────
	# While rolling, the ability owns movement entirely (its own accel, low friction
	# and wall ricochet) — bypass the normal input/kick/damping path below.
	if _active_ability == 3 and _ability_active:
		_tick_roll(delta, direction)
		return

	_was_on_floor = on_floor

	# ── Ground locomotion — smooth accelerate / friction ──────────────────────
	# WASD/arrows drive the bull directly: hold a direction to ramp up to max_speed
	# and steer, release to coast to a stop. Ability bursts (dash) and wall bounces
	# can exceed max_speed — while a direction is held we steer that momentum without
	# braking it (cap tracks the current speed); friction only bleeds the excess once
	# input is released.
	var flat_vel  := Vector3(velocity.x, 0.0, velocity.z)
	var max_speed := DP.f("max_speed")
	if direction.length_squared() > 0.01:
		var cap := maxf(max_speed, flat_vel.length())
		flat_vel = flat_vel.move_toward(direction * cap, DP.f("move_accel") * delta)
	else:
		flat_vel = flat_vel.move_toward(Vector3.ZERO, DP.f("move_friction") * delta)
	velocity.x = flat_vel.x
	velocity.z = flat_vel.z

	# ── Visual rotation follows velocity direction ─────────────────────────────
	var flat_speed := Vector2(velocity.x, velocity.z).length()
	if flat_speed > 0.4:
		var target_angle := atan2(velocity.x, velocity.z)
		cube_guy.rotation.y = lerp_angle(
			cube_guy.rotation.y, target_angle, delta * DP.f("visual_turn_speed"))

	_pre_slide_vel_y = velocity.y
	var pre_wall_vel := Vector3(velocity.x, 0.0, velocity.z)
	move_and_slide()

	# ── Wall bounce — no sliding, guaranteed exit ────────────────────────────
	# pre_wall_vel is captured before move_and_slide strips the into-wall component,
	# so into_spd correctly reflects how hard the bull hit the wall even when stationary.
	for i in get_slide_collision_count():
		var col    := get_slide_collision(i)
		var normal := col.get_normal()
		if abs(normal.y) < 0.5:
			var flat_n   := Vector3(normal.x, 0.0, normal.z).normalized()
			var into_spd := -pre_wall_vel.dot(flat_n)
			var exit_spd := maxf(into_spd * DP.f("wall_bounce_restitution"),
				DP.f("wall_min_bounce_speed"))
			velocity.x   = flat_n.x * exit_spd
			velocity.z   = flat_n.z * exit_spd
			pre_wall_vel = Vector3(velocity.x, 0.0, velocity.z)

	# ── Bounce on landing ─────────────────────────────────────────────────────
	if is_on_floor() and not _was_on_floor:
		var impact := -_pre_slide_vel_y
		if impact > DP.f("bounce_min_impact") and not _slam_pending:
			velocity.y = impact * DP.f("bounce_restitution")

	# ── Slam landing ──────────────────────────────────────────────────────────
	if _slam_pending and is_on_floor() and not _was_on_floor:
		_slam_pending   = false
		_ability_active = false
		_active_ability = -1
		_ability_timer  = 0.0
		_legs.set(&"charge_pitch_target", 0.0)
		_legs.set(&"tail_ragdoll", false)
		_play_idle()
		_spawn_slam_fx()
		_hit_matadors_radius(DP.f("slam_range"), DP.f("slam_strength"), DP.f("slam_launch_up"))

	# ── Dust ──────────────────────────────────────────────────────────────────
	if flat_speed > DP.f("dust_charge_spd") and on_floor:
		_set_dust_state(DustState.CHARGE)
	elif flat_speed > DP.f("dust_walk_spd") and on_floor:
		_set_dust_state(DustState.WALK)
	else:
		_set_dust_state(DustState.NONE)

	# ── Charge trail direction ────────────────────────────────────────────────
	if _dust_state == DustState.CHARGE and _charge_trail_emitter:
		var vel_flat := Vector3(velocity.x, 0.0, velocity.z)
		if vel_flat.length_squared() > 0.1:
			_charge_trail_emitter.direction = (-vel_flat.normalized() + Vector3(0.0, 0.25, 0.0)).normalized()

	# ── Hoof sounds ───────────────────────────────────────────────────────────


# A single clean hit — thrown or swung blade — ends the run. `cause` ("gored" /
# "thrown") tags how it happened for the death notice. Latches so the lose screen is
# raised exactly once even if several blades land on the same frame.
func take_sword_hit(cause: String = "") -> void:
	if _dead:
		return
	_dead = true
	died.emit(cause)