class_name MainCamera
extends Camera3D

static var instance: MainCamera

@export_group("References")
@export var _listener: AudioListener3D

@export_group("Positioning")
@export var _height_offset: float = 0.5
@export var _distance: float = 30
@export var _fov: float = 25
@export var _angle_degrees: Vector3 = Vector3(-45, -45, 0)
@export var _aim_offset_factor_mouse: float = 0.2
@export var _aim_offset_factor_controller: float = 0.5
@export var _aim_damping: float = 1

@export_group("Damage shake")
@export var _damage_shake_duration: float = 0.5
@export_exp_easing var _damage_shake_ease: float = 2
@export var _damage_shake_amplitude: float = 0.1
@export var _damage_shake_frequency: float = 50

@export_group("Hit shake")
@export var _hit_shake_fov: float = 1
@export var _hit_shake_duration: float = 0.5
@export_exp_easing var _hit_shake_ease: float = 4

var _player_offsets: Dictionary[int, PlayerOffset]
var _damage_shake_time: float = 0
var _hit_shake_time: float = 0


func _ready() -> void:
	instance = self
	_listener.make_current()
	for player in Player.instances:
		_connect_player_signals(player)


func _process(delta: float) -> void:
	global_rotation_degrees = _angle_degrees
	fov = _fov
	_damage_shake(delta)
	_hit_shake(delta)


func _physics_process(delta: float) -> void:
	call_deferred("_process_following", delta)


func _process_following(delta: float) -> void:
	var follow_position: Vector3 = Vector3.ZERO
	for player in Player.instances:
		follow_position += _follow(player, delta)
	follow_position /= Player.instances.size()
	follow_position += Vector3.UP * _height_offset

	global_position = follow_position + transform.basis.z * _distance
	_listener.global_position = follow_position


func _connect_player_signals(player: Player) -> void:
	player.stats.damaged.connect(_on_player_stats_damaged)
	player.attack.did_hit.connect(_on_player_attack_did_hit)


func _follow(player: Player, delta: float) -> Vector3:
	var id := player.get_instance_id()
	if not _player_offsets.has(id):
		_player_offsets[id] = PlayerOffset.new()

	var player_offset := _player_offsets[id]

	var player_position := player.global_position
	if player.is_on_floor():
		player_offset.floor_height = player_position.y
	player_position.y = player_offset.floor_height + Projectile.HEIGHT

	if not Player.is_single_player():
		player_offset.aim_offset = Vector3.ZERO
	elif player.input_mode_is(Inputer.Mode.KB_MOUSE):
		player_offset.aim_offset = player.aiming.aim_offset
	elif player.input_mode_is(Inputer.Mode.CONTROLLER):
		var new_aim_offset := (
			Vector3.ZERO
			if player.aiming.aim_input.length() == 0
			else player.aiming.aim_offset
		)
		player_offset.aim_offset = player_offset.aim_offset.lerp(
			new_aim_offset, _aim_damping * delta
		)

	var follow_position := (
		player_position
		+ (
			player_offset.aim_offset as Vector3
			* (
				_aim_offset_factor_mouse
				if player.input_mode_is(Inputer.Mode.KB_MOUSE)
				else _aim_offset_factor_controller
			)
		)
	)

	Debugger.circle("follow_position" + str(player.name), follow_position)

	return follow_position


func _damage_shake(delta: float) -> void:
	if _damage_shake_time <= 0:
		return

	_damage_shake_time -= delta
	var shake_value := (
		sin(_damage_shake_frequency * _damage_shake_time) * _damage_shake_amplitude
	)
	global_rotation.z += (
		shake_value
		* ease(_damage_shake_time / _damage_shake_duration, _damage_shake_ease)
	)


func _hit_shake(delta: float) -> void:
	if _hit_shake_time <= 0:
		return

	_hit_shake_time -= delta
	fov += (
		_hit_shake_fov * ease(_hit_shake_time / _hit_shake_duration, _hit_shake_ease)
	)


func _on_player_stats_damaged() -> void:
	_damage_shake_time = _damage_shake_duration


func _on_player_attack_did_hit() -> void:
	_hit_shake_time = _hit_shake_duration


class PlayerOffset:
	var floor_height: float = 0
	var aim_offset: Vector3 = Vector3.ZERO