class_name GameViewportContainer extends SubViewportContainer
## SubViewportContainer with game-specific special effects

const SMALL_HIT_LAG_FRAMES := 5
const BIG_HIT_LAG_FRAMES := 10
const HUGE_HIT_LAG_FRAMES := 20

var _screen_shake_intensity := 0.0
var _hit_lag_frames := -1

@onready var root_control: Control = %RootControl
@onready var content: Node = %Content


## Start playing a screen shake effect.
func screen_shake(intensity: float, duration: float = 0.2) -> void:
	if not ProjectSettings.get_setting("game/config/accessibility/enable_screen_shake"):
		return

	var tween := get_tree().create_tween()
	_screen_shake_intensity = intensity
	tween.tween_property(self, "_screen_shake_intensity", 0.0, duration).set_trans(
		Tween.TRANS_CUBIC
	)
	tween.tween_callback(_reset_position)


## Hit lag for a small impact.
func hit_lag_small() -> void:
	hit_lag(SMALL_HIT_LAG_FRAMES)


## Hit lag for a big impact.
func hit_lag_big() -> void:
	hit_lag(BIG_HIT_LAG_FRAMES)


## Hit lag for a huge impact.
func hit_lag_huge() -> void:
	hit_lag(HUGE_HIT_LAG_FRAMES)


## Stop processing for some number of frames.
func hit_lag(frames: int = 1) -> void:
	if not ProjectSettings.get_setting("game/config/accessibility/enable_hit_lag"):
		return

	_hit_lag_frames = frames


func _reset_position() -> void:
	position = Vector2.ZERO


func _process(_delta: float) -> void:
	if _screen_shake_intensity > 0:
		position.x = randfn(0, _screen_shake_intensity)
		position.y = randfn(0, _screen_shake_intensity)

	if _hit_lag_frames >= 0:
		if _hit_lag_frames == 0:
			content.process_mode = Node.PROCESS_MODE_INHERIT
		else:
			content.process_mode = Node.PROCESS_MODE_DISABLED
		_hit_lag_frames -= 1