package cart

import (
	"errors"
	"log"

	messages "git.k6n.net/mats/go-cart-actor/proto/cart"
)

// SetRecoveryContact replaces the entire recovery-contact bundle on a cart in
// a single event. PUT-style semantics — empty email and an empty token list
// both persist as "no contact attached"; callers wanting to clear should send
// an empty bundle.
//
// Trivial whitespace-only normalization is intentionally NOT done here: the
// notifier layer owns validation (and the LoggingNotifier just logs). A future
// real notifier does its own normalization before sending, so we don't want
// to lose the original input.
func SetRecoveryContact(grain *CartGrain, req *messages.SetRecoveryContact) error {
	if req == nil {
		return errors.New("SetRecoveryContact: nil payload")
	}
	grain.Email = req.Email
	if len(req.PushTokens) == 0 {
		grain.PushTokens = nil
		return nil
	}
	tokens := make([]PushToken, 0, len(req.PushTokens))
	dropped := 0
	for _, t := range req.PushTokens {
		if t == nil {
			// Defensive: a malformed wire request left a nil slot in the
			// repeated field. Skip rather than crash and surface at debug
			// level so a misbehaving client is visible without spamming.
			dropped++
			continue
		}
		tokens = append(tokens, PushToken{
			Platform: t.Platform,
			Token:    t.Token,
		})
	}
	if dropped > 0 {
		log.Printf("SetRecoveryContact: dropped %d nil push-token entries (malformed wire)", dropped)
	}
	if len(tokens) == 0 {
		grain.PushTokens = nil
		return nil
	}
	grain.PushTokens = tokens
	return nil
}