class_name Focus
extends Camera2D
# Transition to next slide and focus current slide


signal ended

@export_group("Tween caracteristics", "tween_")
@export var tween_is_parallel: bool = false

@export_group("Step backward", "back_")
@export var back_zoom_multiplier: float = 0.8
@export var back_duration: float = 1.0

@export_group("Move focus", "move_")
@export var move_duration: float = 1.0

@export_group("Step inward", "in_")
@export var in_duration: float = 1.0

var tween: Tween


func focus_on(pos: Vector2, scope: float) -> void:
	if tween:
		tween.kill()

	var target_zoom = Vector2.ONE / scope
	var min_zoom = target_zoom if target_zoom.x < get_zoom().x else get_zoom()

	tween = create_tween().set_parallel(tween_is_parallel)
	tween.tween_property(self, "zoom", min_zoom * back_zoom_multiplier, back_duration)
	tween.tween_property(self, "position", pos, move_duration)
	tween.tween_property(self, "zoom", target_zoom, in_duration)
	tween.tween_callback(end)


func end():
	ended.emit()


func _on_show_new_focus(pos: Vector2, scope: float) -> void:
	focus_on(pos, scope)