package proxmox

import (
	"strings"
	"time"

	"gitea.home.hrajfrisbee.cz/kacerr/egress-proxies-operator/internal/provider"
)

// createdAtKey is the third line of the mark; the first two use the
// contract's label names.
const createdAtKey = "proxy-operator-created-at"

// instanceMark is the GC mark as read back from a VM's description (spec
// entry 8).
type instanceMark struct {
	Managed   bool
	UID       string
	CreatedAt time.Time
}

// formatDescription renders the mark written in the clone call.
func formatDescription(uid string, createdAt time.Time) string {
	return provider.LabelManaged + "=" + provider.LabelManagedYes + "\n" +
		provider.LabelUID + "=" + uid + "\n" +
		createdAtKey + "=" + createdAt.UTC().Format(time.RFC3339)
}

// parseDescription reads key=value lines, tolerating CRLF, blank lines and
// lines an admin added. The first occurrence of a key wins. Managed only
// when the value is exactly LabelManagedYes; an unparsable created-at gives
// the zero time, which GC treats as old.
func parseDescription(desc string) instanceMark {
	var m instanceMark
	seen := map[string]bool{}
	for line := range strings.SplitSeq(desc, "\n") {
		key, value, ok := strings.Cut(strings.TrimSpace(line), "=")
		if !ok || seen[key] {
			continue
		}
		seen[key] = true
		switch key {
		case provider.LabelManaged:
			m.Managed = value == provider.LabelManagedYes
		case provider.LabelUID:
			m.UID = value
		case createdAtKey:
			if t, err := time.Parse(time.RFC3339, value); err == nil {
				m.CreatedAt = t
			}
		}
	}
	return m
}