class_name FlashEffect
extends BaseEffect

@export var flash_color: Color = Color.WHITE
@export var flash_speed: float = 10.0

var _timer: float = 0.0
var _original_material: Material

func start(target: Node) -> void:
    _timer = 0.0
    if target is CanvasItem:
        _original_material = target.material
        # Apply a ShaderMaterial that handles the flash
        var flash_material = ShaderMaterial.new()
        flash_material.shader = preload("res://shaders/flash.gdshader")
        target.material = flash_material

func process(delta: float, target: Node) -> void:
    _timer += delta
    if target.material is ShaderMaterial:
        var intensity = (sin(_timer * flash_speed) + 1.0) / 2.0
        target.material.set_shader_parameter("flash_intensity", intensity)

func stop(target: Node) -> void:
    if target is CanvasItem:
        target.material = _original_material