extends Node2D

class_name Unit

signal walk_finished

@export var grid: Resource

var _spawnPosition: Vector2

@onready var _readyToSelectMarker: Sprite2D = $ReadyToSelectMarker
@onready var _selectedMarker: Sprite2D = $SelectedMarker

var _readyToSelect: bool = false

var isSelected := false:
	set(value):
		isSelected = value
		if isSelected: _selectUnit()
		else: _deselectUnit()

var TargetPosition: Vector2
var _isMoving := false:
	set(value):
		_isMoving = value
		set_process(_isMoving)	

## Unit Data
### Distance in cells
@export var moveRange := 6
### Speed along the path
@export var moveSpeed := 600.0

# Coordinates of the current cell the cursor moved to
var cell := Vector2.ZERO:
	set(value):
		# When changing the cell's value, we don't want to allow coordinates outside the grid.
		cell = grid.clamp(value)
@onready var _path: Path2D = $Path2D
@onready var _pathFollow: PathFollow2D = $Path2D/PathFollow2D
# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	# Spawning
	global_position = _spawnPosition
	_readyToSelectMarker.hide()
	_selectedMarker.hide()

	# Pathing and Grid	
	set_process(false)
	_pathFollow.rotates = false
	
	cell = grid.calculateGridCoordinates(position)
	position = grid.calculateMapPosition(cell)
	
	# We create the curve resource here because creating it in the editor prevents
	# us from moving the unit.
	if not Engine.is_editor_hint():
		_path.curve = Curve2D.new()
	
# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta: float) -> void:
	pass
	
func _input(event: InputEvent):
	if event.is_action_pressed("Select"):
		print_debug("Action is Select")
		
		# We combine it with the fact that it is already marked (@see _markUnit)
		if _readyToSelect: isSelected = true 
		else: isSelected = false
	
func _selectUnit():
	_selectedMarker.show()

func _deselectUnit():
	_selectedMarker.hide()

func _gets_selected(viewport: Node, event: InputEvent, shape_index: int):
	if event.is_action_pressed("Select") and event.position == position:
		_selectUnit()

func _markUnit():
	_readyToSelect = true
	_readyToSelectMarker.show()

func _unMarkUnit():
	_readyToSelect = false
	_readyToSelectMarker.hide()
	
func moveToTarget():
	pass