extends DialogicSubsystem

## Subsystem that holds methods for jumping to specific labels, or return to the previous jump.

signal switched_timeline(info:Dictionary)
signal jumped_to_label(info:Dictionary)
signal returned_from_jump(info:Dictionary)
signal passed_label(info:Dictionary)


#region STATE
####################################################################################################

func clear_game_state(clear_flag:=DialogicGameHandler.ClearFlags.FULL_CLEAR) -> void:
	dialogic.current_state_info['jump_stack'] = []
	dialogic.current_state_info.erase("last_label")


func load_game_state(load_flag:=LoadFlags.FULL_LOAD) -> void:
	if not 'jump_stack' in dialogic.current_state_info:
		dialogic.current_state_info['jump_stack'] = []

#endregion


#region MAIN METHODS JUMP
####################################################################################################

func jump_to_label(label:String) -> void:
	if label.is_empty():
		dialogic.current_event_idx = 0
		jumped_to_label.emit({'timeline':dialogic.current_timeline, 'label':"TOP"})
		return

	var idx: int = -1
	while true:
		idx += 1
		var event: Variant = dialogic.current_timeline.get_event(idx)
		if not event:
			idx = dialogic.current_event_idx
			break
		if event is DialogicLabelEvent and event.name == label:
			break
	dialogic.current_event_idx = idx-1
	jumped_to_label.emit({'timeline':dialogic.current_timeline, 'label':label})


func push_to_jump_stack() -> void:
	dialogic.current_state_info['jump_stack'].push_back({'timeline':dialogic.current_timeline, 'index':dialogic.current_event_idx, 'label':dialogic.current_timeline_events[dialogic.current_event_idx].label_name})


func resume_from_last_jump() -> void:
	var sub_timeline: DialogicTimeline = dialogic.current_timeline
	var stack_info: Dictionary = dialogic.current_state_info['jump_stack'].pop_back()
	dialogic.start_timeline(stack_info.timeline, stack_info.index+1)
	returned_from_jump.emit({'sub_timeline':sub_timeline, 'label':stack_info.label})


func is_jump_stack_empty() -> bool:
	return len(dialogic.current_state_info['jump_stack']) < 1

#endregion


#region MAIN MEHTODS LABELS
####################################################################################################

func _ready() -> void:
	passed_label.connect(_on_passed_label)


func _on_passed_label(info:Dictionary) -> void:
	dialogic.current_state_info["last_label"] = info


## Returns the identifier name of the last passed label
func get_last_label_identifier() -> String:
	if not dialogic.current_state_info.has("last_label"):
		return ""

	return dialogic.current_state_info["last_label"].identifier


## Returns the display name of the last passed label (translated if translation are enabled)
func get_last_label_name() -> String:
	if not dialogic.current_state_info.has("last_label"):
		return ""

	return dialogic.current_state_info["last_label"].display_name
#endregion