extends Node

# ScreenShakeManager - Camera-local shake that follows the player

var camera: Camera3D
var shake_intensity: float = 0.0
var shake_duration: float = 0.0
var shake_timer: float = 0.0
var shake_offset: Vector3 = Vector3.ZERO

# Shake presets
const SHAKE_TARGETED: Dictionary = {"intensity": 0.15, "duration": 0.4}
const SHAKE_GOAL_COMPLETE: Dictionary = {"intensity": 0.1, "duration": 0.3}
const SHAKE_LIGHT: Dictionary = {"intensity": 0.05, "duration": 0.2}

func initialize(p_camera: Camera3D):
	camera = p_camera

func shake(intensity: float, duration: float) -> void:
	"""Trigger a camera shake. Intensity in world units, duration in seconds."""
	if intensity <= 0 or duration <= 0:
		return
	# Take the stronger shake if already active
	if shake_timer > 0 and intensity <= shake_intensity:
		return
	shake_intensity = intensity
	shake_duration = duration
	shake_timer = duration

func _process(delta: float) -> void:
	if not camera or not is_instance_valid(camera):
		return
	if shake_timer > 0:
		shake_timer -= delta
		var progress = shake_timer / shake_duration
		# Fade out intensity as timer expires
		var current_intensity = shake_intensity * progress
		# Random offset within intensity range
		shake_offset = Vector3(
			randf_range(-current_intensity, current_intensity),
			randf_range(-current_intensity, current_intensity) * 0.5,
			randf_range(-current_intensity, current_intensity)
		)
		camera.position += shake_offset
	else:
		shake_offset = Vector3.ZERO