const (
	RoDir = "overlayfs" // overlayfs as rootfs. upper + lower (overlaybd)
	RwDir = "dir"       // mount overlaybd as rootfs
	RwDev = "dev"       // use overlaybd directly
)

type BootConfig struct {
	Address           string                 `json:"address"`
	Root              string                 `json:"root"`
	LogLevel          string                 `json:"verbose"`
	LogReportCaller   bool                   `json:"logReportCaller"`
	RwMode            string                 `json:"rwMode"` // overlayfs, dir or dev
	AutoRemoveDev     bool                   `json:"autoRemoveDev"`
	ExporterConfig    metrics.ExporterConfig `json:"exporterConfig"`
	WritableLayerType string                 `json:"writableLayerType"` // append or sparse
}

type Opt func(config *SnapshotterConfig) error

type OverlayBDBSConfig struct {
	RepoBlobURL       string                   `json:"repoBlobUrl"`
	Lowers            []OverlayBDBSConfigLower `json:"lowers"`
	Upper             OverlayBDBSConfigUpper   `json:"upper"`
	ResultFile        string                   `json:"resultFile"`
	AccelerationLayer bool                     `json:"accelerationLayer,omitempty"`
	RecordTracePath   string                   `json:"recordTracePath,omitempty"`
}

type OverlayBDBSConfigLower struct {
	GzipIndex    string `json:"gzipIndex,omitempty"`
	File         string `json:"file,omitempty"`
	Digest       string `json:"digest,omitempty"`
	TargetFile   string `json:"targetFile,omitempty"`
	TargetDigest string `json:"targetDigest,omitempty"`
	Size         int64  `json:"size,omitempty"`
	Dir          string `json:"dir,omitempty"`
}

type OverlayBDBSConfigUpper struct {
	Index     string `json:"index,omitempty"`
	Data      string `json:"data,omitempty"`
	Target    string `json:"target,omitempty"`
	GzipIndex string `json:"gzipIndex,omitempty"`
}

type SnapshotterConfig struct {
	// OverlayBDUtilBinDir contains overlaybd-create/overlaybd-commit tools
	// to handle writable device.
	OverlayBDUtilBinDir string `toml:"overlaybd_util_bin_dir" json:"overlaybd_util_bin_dir"`
}

type ZFileConfig struct {
	Algorithm string `json:"algorithm"`
	BlockSize int    `json:"blockSize"`
}