extends CharacterBody3D
class_name Fragment

@export var sub: PackedScene
@export var gravity_scale: float = 1.0
@export var velocity_min: Vector2 = Vector2.ONE
@export var velocity_max: Vector2 = Vector2.ONE

@onready var sprite3D: Sprite3D = %Sprite3D as Sprite3D

var gravity           = ProjectSettings.get_setting("physics/3d/default_gravity")
var frame_rate: float = 0.1
var frame_time: float = 0


func _ready():
    var dir: Vector2 = Util.angle_dir(randf_range(0, 360)) * randf_range(velocity_min.x, velocity_max.x)
    velocity.x = dir.x
    velocity.z = dir.y
    velocity.y = randf_range(velocity_min.y, velocity_max.y)


func _process(delta: float) -> void:
    velocity.y -= gravity * gravity_scale * delta
    var frame_count: int      = sprite3D.hframes * sprite3D.vframes
    var frame_time_all: float = frame_rate * frame_count
    frame_time += delta
    sprite3D.frame = int(frame_time / frame_rate) % frame_count
    frame_time = fmod(frame_time, frame_time_all)
    if move_and_slide():
        var sub_particle: Node3D = sub.instantiate() as Node3D
        SignalManager.effect_create.emit(sub_particle)
        sub_particle.global_position = global_position
        queue_free()