class_name ChatBox extends PanelContainer

const VN_REVEAL_TIME = 0.01
const _DEFAULT_ANCHOR_TOP = 1.0
const _DEFAULT_ANCHOR_RIGHT = 1.0
const _DEFAULT_ANCHOR_BOTTOM = 1.0
const _DEFAULT_OFFSET_TOP = -58.0

var label:AdvancedRichText;
var parsedOutText = ""
var revealTimer:float = 0;

var lineStarts:Array[int] = [];
var newlineIndexes:Array[int] = [];
var currentViewScrolled = true;
var isSpeedupDown = false;

var hasLetGoOfInteract:bool = true;
var worldTarget:Node3D = null

var isClosed:bool = false:
  get():
    return !self.visible;
  set(value):
    self.visible = !value;

signal chatboxClosing

func _ready() -> void:
  label = $MarginContainer/Label
  isClosed = true

func _setWorldLayout(hasTarget:bool) -> void:
  if hasTarget:
    anchor_left = 0.0
    anchor_top = 0.0
    anchor_right = 0.0
    anchor_bottom = 0.0
    offset_left = 0.0
    offset_top = 0.0
    offset_right = 0.0
    offset_bottom = 0.0
    custom_minimum_size = Vector2(90, 0)
  else:
    if label != null:
      label.fit_content = false
    anchor_left = 0.0
    anchor_top = _DEFAULT_ANCHOR_TOP
    anchor_right = _DEFAULT_ANCHOR_RIGHT
    anchor_bottom = _DEFAULT_ANCHOR_BOTTOM
    offset_left = 0.0
    offset_top = _DEFAULT_OFFSET_TOP
    offset_right = 0.0
    offset_bottom = 0.0
    custom_minimum_size = Vector2.ZERO

func _updateWorldPosition() -> void:
  if worldTarget == null:
    return
  var camera:Camera3D = get_viewport().get_camera_3d()
  if camera == null:
    return
  var screenPos:Vector2 = camera.unproject_position(worldTarget.global_position + Vector3(0, 2.5, 0))
  var viewportSize:Vector2 = get_viewport().get_visible_rect().size
  position = screenPos - size * 0.5
  position.x = clamp(position.x, 0.0, viewportSize.x - size.x)
  position.y = clamp(position.y, 0.0, viewportSize.y - size.y)

func _process(delta: float) -> void:
  if isClosed:
    return

  _updateWorldPosition()

  # _recalcText always resets fit_content; keep it on in world-space mode so
  # the PanelContainer auto-sizes to the full speech-bubble content.
  if worldTarget != null and !label.fit_content:
    label.fit_content = true

  if label.getFinalText() == "":
    isClosed = true
    return

  if Input.is_action_just_released("interact") and !hasLetGoOfInteract:
    hasLetGoOfInteract = true
    return

  # World-space (speech-bubble) mode: all text is shown immediately with no
  # typing reveal. One press advances to the next page; release closes the last.
  if worldTarget != null:
    if (label.maxLines + label.startLine) < label.getTotalLineCount():
      if Input.is_action_just_pressed("interact") and hasLetGoOfInteract:
        label.startLine += label.maxLines
        label.fit_content = true
    else:
      if Input.is_action_just_released("interact") and hasLetGoOfInteract:
        chatboxClosing.emit()
        isClosed = true
    return

  # Bottom-bar mode: typing reveal with paging.
  if label.visible_characters >= label.getCharactersDisplayedCount():
    if (label.maxLines + label.startLine) < label.getTotalLineCount():
      if Input.is_action_just_pressed("interact") and hasLetGoOfInteract:
        label.startLine += label.maxLines
        label.visible_characters = 0
        currentViewScrolled = false
        return
      currentViewScrolled = true
    else:
      if Input.is_action_just_released("interact") and hasLetGoOfInteract:
        chatboxClosing.emit()
        isClosed = true
      currentViewScrolled = true
    return

  if Input.is_action_just_pressed("interact") and hasLetGoOfInteract:
    isSpeedupDown = true
  elif Input.is_action_just_released("interact") and hasLetGoOfInteract:
    isSpeedupDown = false
  elif !Input.is_action_pressed("interact") and hasLetGoOfInteract:
    isSpeedupDown = false

  revealTimer += delta
  if isSpeedupDown:
    revealTimer += delta

  if revealTimer > VN_REVEAL_TIME:
    revealTimer = 0
    label.visible_characters += 1

func setText(text:String, target:Node3D = null) -> void:
  worldTarget = target
  _setWorldLayout(worldTarget != null)

  revealTimer = 0
  currentViewScrolled = false
  label.startLine = 0
  label.text = text

  if worldTarget != null:
    # Speech-bubble mode: show all text immediately and auto-size the container.
    # _recalcText already sets visible_characters = -1; just enable fit_content.
    label.fit_content = true
  else:
    label.visible_characters = 0

  hasLetGoOfInteract = !Input.is_action_pressed("interact")
  isSpeedupDown = false
  isClosed = false

func setTextAndWait(text:String, target:Node3D = null) -> void:
  self.setText(text, target);
  await self.chatboxClosing
  await get_tree().process_frame