extends Area3D

enum State {
	ROAM,
	CHARGE,
	COOLDOWN
}

var current_state: State = State.ROAM
var gridmap: Node
var arena_manager: Node

var move_speed: float = 3.0
var charge_speed: float = 12.0
var target_pos: Vector3
var state_timer: float = 0.0
var slow_timer: float = 0.0

func _ready():
	add_to_group("MektonBulls")
	body_entered.connect(_on_body_entered)

func initialize(manager: Node, grid: Node, start_pos: Vector3):
	arena_manager = manager
	gridmap = grid
	position = start_pos
	_pick_roam_target()

func apply_slow(duration: float) -> void:
	slow_timer = duration

func _physics_process(delta: float):
	if not multiplayer.is_server():
		return
		
	state_timer -= delta
	if slow_timer > 0:
		slow_timer -= delta
	
	match current_state:
		State.ROAM:
			_process_roam(delta)
			if state_timer <= 0:
				_try_start_charge()
		State.CHARGE:
			_process_charge(delta)
		State.COOLDOWN:
			if state_timer <= 0:
				current_state = State.ROAM
				_pick_roam_target()

func _process_roam(delta: float):
	var dist = position.distance_to(target_pos)
	if dist < 0.1:
		_pick_roam_target()
	else:
		var dir = (target_pos - position).normalized()
		dir.y = 0 
		if dir.length_squared() > 0:
			var actual_speed = move_speed
			if slow_timer > 0: actual_speed *= 0.5
			position += dir * actual_speed * delta
			# Face direction implicitly
			var look_target = position + dir
			look_target.y = position.y
			if position.distance_squared_to(look_target) > 0.01:
				look_at(look_target, Vector3.UP)

func _pick_roam_target():
	if not arena_manager: return
	
	var bounds = arena_manager.arena_size_for_phase(arena_manager.current_phase)
	# Random walkable position within bounds
	# We know 0,0 is boundary, bounds.x-1 is boundary
	var min_x = 1
	var max_x = bounds.x - 2
	var min_z = 1
	var max_z = bounds.y - 2
	
	if min_x > max_x: max_x = min_x
	if min_z > max_z: max_z = min_z
	
	# Avoid exact center (where the static delivery target presumably sits)
	var cx = int(bounds.x / 2.0)
	var cz = int(bounds.y / 2.0)
	
	var rx = cx
	var rz = cz
	while rx == cx and rz == cz:
		rx = randi_range(min_x, max_x)
		rz = randi_range(min_z, max_z)
	
	var world_x = rx * gridmap.cell_size.x + gridmap.cell_size.x / 2.0
	var world_z = rz * gridmap.cell_size.z + gridmap.cell_size.z / 2.0
	
	target_pos = Vector3(world_x, position.y, world_z)
	state_timer = randf_range(2.0, 4.0)

func _try_start_charge():
	# Find closest player
	var players = get_tree().get_nodes_in_group("Players")
	var closest_player = null
	var min_dist = INF
	
	for p in players:
		if p.is_in_group("Players") and p.has_method("is_eliminated") and not p.is_eliminated():
			var d = position.distance_to(p.position)
			if d < min_dist and d < 15.0: # Range check
				min_dist = d
				closest_player = p
				
	if closest_player:
		current_state = State.CHARGE
		target_pos = closest_player.position
		target_pos.y = position.y
		state_timer = 2.0 # Max charge duration
		if has_node("/root/SfxManager"):
			get_node("/root/SfxManager").play_rpc("bull_charge")
	else:
		_pick_roam_target()

func _process_charge(delta: float):
	var dir = (target_pos - position).normalized()
	dir.y = 0
	var actual_speed = charge_speed
	if slow_timer > 0: actual_speed *= 0.5
	position += dir * actual_speed * delta
	
	var look_target = position + dir
	look_target.y = position.y
	if position.distance_squared_to(look_target) > 0.01:
		look_at(look_target, Vector3.UP)
		
	var dist = position.distance_to(target_pos)
	if dist < 0.5 or state_timer <= 0:
		# Hit destination or timeout
		current_state = State.COOLDOWN
		state_timer = 1.5

func _on_body_entered(body: Node3D):
	if body.is_in_group("Players") and multiplayer.is_server():
		# Knock them out
		if body.has_method("eliminate"):
			body.eliminate()
		else:
			print("[MektonBull] Knocked out player", body.name)
			# Dispatch via manager
			if arena_manager and arena_manager.has_signal("player_eliminated"):
				arena_manager.player_eliminated.emit(body.name.to_int())
		
		# Polish: SFX + Camera Shake
		rpc("sync_bull_impact")

@rpc("authority", "call_local", "unreliable")
func sync_bull_impact() -> void:
	if has_node("/root/SfxManager"):
		get_node("/root/SfxManager").play("bull_impact")
	
	var root = get_tree().root
	var main = root.get_node_or_null("Main")
	if main and main.get("screen_shake_manager"):
		main.screen_shake_manager.shake(0.2, 0.5)