package libvirt

// Client abstracts libvirt operations needed by the node-agent.
type Client interface {
	ListVMs() ([]VM, error)
	CreateVM(spec VMSpec) (VM, error)
	StartVM(id string) error
	StopVM(id string) error
	RebootVM(id string) error
	DeleteVM(id string) error
}

type VMSpec struct {
	ID           string         `json:"id" yaml:"id"`
	Name         string         `json:"name" yaml:"name"`
	CPU          int            `json:"cpus" yaml:"cpus"`
	MemoryMB     int            `json:"memory_mb" yaml:"memory_mb"`
	Disks        []DiskSpec     `json:"disks" yaml:"disks"`
	NICs         []NICSpec      `json:"nics" yaml:"nics"`
	CloudInit    *CloudInitSpec `json:"cloud_init" yaml:"cloud_init"`
	CloudInitISO string         `json:"cloud_init_iso" yaml:"cloud_init_iso"`
}

type DiskSpec struct {
	Name     string `json:"name" yaml:"name"`
	Pool     string `json:"pool" yaml:"pool"`
	SizeGB   int    `json:"size_gb" yaml:"size_gb"`
	Bus      string `json:"bus" yaml:"bus"`
	Path     string `json:"path" yaml:"path"`
	Prealloc string `json:"prealloc" yaml:"prealloc"` // "", "metadata", "full"
}

type NICSpec struct {
	Bridge string `json:"bridge" yaml:"bridge"`
	VLAN   int    `json:"vlan" yaml:"vlan"`
	Model  string `json:"model" yaml:"model"`
}

type CloudInitSpec struct {
	User     string   `json:"user" yaml:"user"`
	SSHKeys  []string `json:"ssh_keys" yaml:"ssh_keys"`
	UserData string   `json:"user_data" yaml:"user_data"`
}

type VM struct {
	ID       string
	Name     string
	Status   string
	CPU      int
	MemoryMB int
}

// TODO: implement a real libvirt-go backed client that renders domain XML from templates.