extends AudioStreamPlayer

const MUTE_VOLUME := -80.0

@export var volume_increment := 0.618
@export var base_volume := -18.0
@export var boosted_volume := -2.0

@export_category("Beast Proximity Boost")
@export var proximity_cutoff := 20.0
@export var proximity_scale := 17.0

var target_volume := MUTE_VOLUME
var suppressed := false
var boosted := false


func _ready() -> void:
	Game.manager.alert_raised.connect(_on_alert_raised)


func get_target_volume() -> float:
	if suppressed:
		return MUTE_VOLUME
	if boosted:
		return boosted_volume
	return target_volume + beast_proximity_boost(closest_beast_distance())


## Calculate the volume gain from proximity to a beast
func beast_proximity_boost(distance: float) -> float:
	return max(0.0, proximity_scale * (proximity_cutoff - distance) / proximity_cutoff)


## Get the distance from the player to the closest beast
func closest_beast_distance() -> float:
	if not is_instance_valid(Player.instance):
		return INF

	var min_dist_sq := INF
	var nodes := get_tree().get_nodes_in_group("GrunkBeast")
	for node: Node in nodes:
		var n3d := node as Node3D
		if is_instance_valid(n3d):
			var dist_sq := n3d.global_position.distance_squared_to(Player.instance.global_position)
			if dist_sq < min_dist_sq:
				min_dist_sq = dist_sq
	return sqrt(min_dist_sq)


## Temporarily suppress ambience
func suppress(time: float = 5.0) -> void:
	suppressed = true
	get_tree().create_timer(time).timeout.connect(_unsuppress)


## Temporarily boost ambience
func boost(time: float = 5.0) -> void:
	boosted = true
	get_tree().create_timer(time).timeout.connect(_unboost)


func _unsuppress() -> void:
	suppressed = false


func _unboost() -> void:
	boosted = false


func _process(delta: float) -> void:
	volume_db = lerpf(volume_db, get_target_volume(), volume_increment * delta)


func _on_player_enters_ship(_body: Node3D) -> void:
	target_volume = MUTE_VOLUME


func _on_player_exits_ship(_body: Node3D) -> void:
	target_volume = base_volume


func _on_alert_raised(new_level: int) -> void:
	if new_level == Game.manager.MAX_ALERT:
		suppress(30)
	else:
		boost(10.0)