_parent = -4;
_init_pos = -4;
_target_pos = -4;
_bullet_sprite = -4;
_bullet_pool = [];
_active = false;
_timer = 0;
_time = 8;

create_bullet = function(arg0, arg1)
{
    var bullet = instance_create(0, 0, obj_ch5_DW29_power_up_bullet);
    bullet.create(id, arg0, new Vector2(view_wport[0] / 2, 970), arg1);
    return bullet;
};

get_bullet = function()
{
    var ready_bullet = -4;
    for (var i = 0; i < array_length(_bullet_pool); i++)
    {
        var bullet = _bullet_pool[i];
        if (bullet.is_active())
            continue;
        ready_bullet = bullet;
        break;
    }
    if (ready_bullet == -4)
    {
        ready_bullet = create_bullet(new Vector2(x, y - 10), _bullet_sprite);
        _bullet_pool[array_length(_bullet_pool)] = ready_bullet;
    }
    return ready_bullet;
};

start_spawning = function(arg0, arg1, arg2, arg3)
{
    _parent = arg0;
    _bullet_sprite = arg3;
    x = arg1.x;
    y = arg1.y;
    _target_pos = arg2;
    _active = true;
};

fade_out = function()
{
    stop();
    for (var i = 0; i < array_length(_bullet_pool); i++)
    {
        var bullet = _bullet_pool[i];
        with (bullet)
            fade_out();
    }
};

trigger_event = function(arg0)
{
    if (arg0 != "bullet_finished")
        exit;
    var all_stopped = true;
    for (var i = 0; i < array_length(_bullet_pool); i++)
    {
        var bullet = _bullet_pool[i];
        if (bullet.is_active())
        {
            all_stopped = false;
            break;
        }
    }
    if (!all_stopped)
        exit;
    with (_parent)
        trigger_event("spawner_finished");
};

stop = function()
{
    _active = false;
};

clean_up = function()
{
    for (var i = 0; i < array_length(_bullet_pool); i++)
    {
        var bullet = _bullet_pool[i];
        with (bullet)
            clean_up();
    }
    instance_destroy();
};