tool
extends Camera2D
"""
Shakes the screen when is_shaking is set to true
To make it react to events happening in the game world, use the Events signal routing singleton
Uses different smoothing values depending on the active controller
"""

onready var timer = $Timer

export var amplitude = 4.0
export var duration = 0.3 setget set_duration
export var DAMP_EASING = 1.0
export var is_shaking = false setget set_is_shaking
export var default_smoothing_speed: = {
	mouse=3,
	gamepad=1
}

enum States {IDLE, SHAKING}
var state = States.IDLE


func reset_smoothing_speed() -> void:
	    smoothing_speed = default_smoothing_speed.mouse


func _ready() -> void:
	timer.connect('timeout', self, '_on_ShakeTimer_timeout')

	self.duration = duration
	reset_smoothing_speed()
	set_process(false)


func _process(delta) -> void:
	var damping = ease(timer.time_left / timer.wait_time, DAMP_EASING)
	offset = Vector2(
		rand_range(amplitude, -amplitude) * damping,
		rand_range(amplitude, -amplitude) * damping)


func _get_configuration_warning() -> String:
	return "" if $Timer else "%s requires a Timer child named Timer" % name


func set_duration(value: float) -> void:
	duration = value
	if timer:
		timer.wait_time = duration


func set_is_shaking(value: bool) -> void:
	is_shaking = value
	if is_shaking:
		_change_state(States.SHAKING)
	else:
		_change_state(States.IDLE)


func _change_state(new_state: int) -> void:
	match new_state:
		States.IDLE:
			offset = Vector2()
			set_process(false)
		States.SHAKING:
			set_process(true)
			timer.start()
	state = new_state


func _on_ShakeTimer_timeout() -> void:
	self.is_shaking = false