package client

import "strconv"

// Scale creates or destroys units to match the desired number
func (c *FleetClient) Scale(component string, requested int) (err error) {
	for {
		components, err := c.Units(component)
		if err != nil {
			return err
		}
		if len(components) == requested {
			break
		}
		if len(components) < requested {
			num, err := c.nextUnit(component)
			if err != nil {
				return err
			}
			err = c.Create(component + "@" + strconv.Itoa(num))
			if err != nil {
				return err
			}
			continue
		}
		if len(components) > requested {
			num, err := c.lastUnit(component)
			if err != nil {
				return err
			}
			err = c.Destroy(component + "@" + strconv.Itoa(num))
			if err != nil {
				return err
			}
			continue
		}
	}
	return
}