extends Node3D

signal matador_killed
signal all_defeated

const MATADOR := preload("res://Matador.tscn")

var _alive: int = 0
var _wave: int = 0
var _resolved: bool = false
var _spawn_points: Array[Node3D] = []


func _ready() -> void:
	add_to_group(&"matador_spawn")
	_spawn.call_deferred()


# Each spawner node is a spawn-point marker. The first in tree order (the one the HUD
# connects its all_defeated to) runs the wave logic and uses every marker — itself and
# its siblings — as an entry point; the rest stay passive so waves aren't run four times.
func _spawn() -> void:
	var markers := get_tree().get_nodes_in_group(&"matador_spawn")
	if markers.is_empty() or markers[0] != self:
		return
	for node: Node in markers:
		if node is Node3D:
			_spawn_points.append(node as Node3D)
	_place_bull(randf() * TAU, DP.f("arena_spawn_radius"))
	_start_next_wave()


# Wave 1 sends 1 matador, wave 2 sends 2, … up to the number of placed spawn points.
# Matadors are assigned to a random subset of spawn points each wave and enter staggered.
func _start_next_wave() -> void:
	_wave += 1
	
	# 8 waves total.
	if _wave > DP.f("mat_wave_size"):
		return
	
	# Wave 1 = 1 matador, Wave 2 = 2, ... Wave 8 = 8.
	var count := _wave
	
	# Shuffle the spawn points so the spawn locations are random.
	var points: Array[Node3D] = _spawn_points.duplicate()
	points.shuffle()
	
	for i in range(count):
		# Reuse spawn points when we have more matadors than points.
		var sp: Node3D = points[i % points.size()]
		
		var m := _spawn_at(sp.global_position)
		m.call_deferred(&"enter_spawn_roll", Vector3.ZERO)
		
		if i < count - 1:
			await get_tree().create_timer(
				DP.f("mat_spawn_stagger")
			).timeout


func _place_bull(angle: float, arena_r: float) -> void:
	var bull := get_tree().get_first_node_in_group(&"player") as Node3D
	if not bull:
		return
	bull.global_position = Vector3(
		cos(angle) * arena_r, bull.global_position.y, sin(angle) * arena_r
	)


func _spawn_at(pos: Vector3) -> Node3D:
	var m: Node3D = MATADOR.instantiate()
	m.position = pos
	get_parent().add_child(m)
	m.killed.connect(_on_matador_killed)
	_alive += 1
	return m


func _on_matador_killed() -> void:
	matador_killed.emit()
	_alive -= 1
	if _alive > 0 or _resolved:
		return
	if _wave >= DP.f("mat_wave_size"):
		DP.set_value("gate_unlocked_bear", true)
		_resolved = true
		all_defeated.emit()
	else:
		await get_tree().create_timer(DP.f("mat_wave_pause")).timeout
		_start_next_wave()