camera.gd

extends Camera2D

const LOOK_AHEAD_FACTOR:float = 0.45

export var tilemap_path:NodePath

onready var tilemap = self.get_node(tilemap_path)
onready var camera_previous_position = self.get_camera_position()

var facing:int = 0

func _on_ready() -> void:
  var tilemap_rect  = tilemap.get_used_rect()
  var tilemap_cell_size = tilemap.cell_size
  self.limit_left = tilemap_rect.position.x * tilemap_cell_size.x * tilemap.scale.x
  self.limit_right = tilemap_rect.end.x * tilemap_cell_size.x * tilemap.scale.x
  self.limit_top = tilemap_rect.position.y * tilemap_cell_size.y * tilemap.scale.y
  self.limit_bottom = tilemap_rect.end.y * tilemap_cell_size.y * tilemap.scale.y

# warning-ignore:unused_argument
func _process(delta: float) -> void:
  _check_facing()


  camera_previous_position = self.get_camera_position()

func _check_facing():
  var new_facing = sign(self.get_camera_position().x - camera_previous_position.x)
  if new_facing != 0 and facing != new_facing:
    facing = new_facing
    var target_offset = self.get_viewport_rect().size.x * LOOK_AHEAD_FACTOR * facing
    var left_screen_border = self.get_camera_position().x - self.get_viewport_rect().size.x/2
    var right_screen_border = self.get_camera_position().x + self.get_viewport_rect().size.x/2
    if (facing == 1 and left_screen_border >= self.limit_right) or\
       (facing == -1 and right_screen_border <= self.limit_left) :
      position.x = target_offset


func _on_player_grounded_updated(is_grounded):
  drag_margin_v_enabled = !is_grounded