package hostclaim

import "fmt"

// Adopt is the one adoption routine (CC8) for a host that has never had a
// claim. It writes discovery chores for every other region and box (CC4).
func Adopt(nh NewHolder, servingBox string, otherRegions, otherBoxes []string, opID string, newID func() string) func(*Claim) error {
	return func(c *Claim) error {
		if c.Gen != 0 || c.Holder != nil {
			return fmt.Errorf("%w: adoption is only for a host that never had a claim", ErrWrongState)
		}
		if nh.Host != c.Host || !keyMatches(nh) || nh.Region == "" || servingBox == "" || opID == "" {
			return fmt.Errorf("%w: adoption inputs are not this host's", ErrWrongState)
		}
		inc, err := Incarnation(nh.Account, nh.App, nh.Host, nh.CreatedAt)
		if err != nil {
			return err
		}
		c.Holder = &Holder{Acquisition: nh.Acquisition, Family: nh.Family, Key: nh.Key, Account: nh.Account, App: nh.App, Name: nh.Name,
			Incarnation: inc, CreatedAt: nh.CreatedAt, Location: "instances/" + nh.Host, Stamp: c.Gen + 1, WriterBox: servingBox}
		c.Op = Op{Kind: KindServing, Exec: servingBox, Participants: []string{servingBox}}
		c.Touched = Touched{Complete: true, Regions: []string{nh.Region}, Boxes: []string{servingBox}}
		appendParkObligations(c, opID, otherRegions, otherBoxes, newID)
		if len(c.Obligations) > 0 {
			c.Touched.Complete, c.Touched.DiscoveryOp = false, opID
			c.Touched.DiscoveryBound = true
			c.Touched.DiscoveryBoxes = append([]string(nil), otherBoxes...)
		}
		return nil
	}
}