const (
	FsDriverBlockdev string = constant.FsDriverBlockdev
	FsDriverFusedev  string = constant.FsDriverFusedev
	FsDriverFscache  string = constant.FsDriverFscache
	FsDriverNodev    string = constant.FsDriverNodev
	FsDriverProxy    string = constant.FsDriverProxy
)

const (
	FailoverPolicyNone   string = constant.FailoverPolicyNone
	FailoverPolicyResend string = constant.FailoverPolicyResend
	FailoverPolicyFlush  string = constant.FailoverPolicyFlush
)

const (
	TarfsLayerVerityOnly      string = "layer_verity_only"
	TarfsImageVerityOnly      string = "image_verity_only"
	TarfsLayerBlockDevice     string = "layer_block"
	TarfsImageBlockDevice     string = "image_block"
	TarfsLayerBlockWithVerity string = "layer_block_with_verity"
	TarfsImageBlockWithVerity string = "image_block_with_verity"
)

type AuthConfig struct {
	// based on kubeconfig or ServiceAccount
	EnableKubeconfigKeychain bool   `toml:"enable_kubeconfig_keychain"`
	KubeconfigPath           string `toml:"kubeconfig_path"`
	// CRI proxy mode
	EnableCRIKeychain   bool   `toml:"enable_cri_keychain"`
	ImageServiceAddress string `toml:"image_service_address"`
	// Kubelet credential provider plugins
	EnableKubeletCredentialProviders bool   `toml:"enable_kubelet_credential_providers"`
	CredentialProviderConfig         string `toml:"credential_provider_config"`
	CredentialProviderBinDir         string `toml:"credential_provider_bin_dir"`
	// Periodic credential renewal interval. When set to a positive duration,
	// the snapshotter caches credentials from configured renewable providers and
	// refreshes them at this interval. Set to 0 (default) to disable.
	CredentialRenewalInterval time.Duration `toml:"credential_renewal_interval"`
}

type CacheManagerConfig struct {
	Disable bool `toml:"disable"`
	// Trigger GC gc_period after the specified period.
	// Example format: 24h, 120min
	GCPeriod time.Duration `toml:"gc_period"`
	CacheDir string        `toml:"cache_dir"`
}

type CgroupConfig struct {
	Enable      bool   `toml:"enable"`
	MemoryLimit string `toml:"memory_limit"`
}

type DaemonConfig struct {
	NydusdPath       string `toml:"nydusd_path"`
	NydusdConfigPath string `toml:"nydusd_config"`
	NydusImagePath   string `toml:"nydusimage_path"`
	RecoverPolicy    string `toml:"recover_policy"`
	FsDriver         string `toml:"fs_driver"`
	ThreadsNumber    int    `toml:"threads_number"`
	LogRotationSize  int    `toml:"log_rotation_size"`
	FailoverPolicy   string `toml:"failover_policy"`
}

type DaemonMode string

const (
	// Spawn a dedicated nydusd for each RAFS instance.
	DaemonModeMultiple DaemonMode = DaemonMode(constant.DaemonModeMultiple)
	// Spawn a dedicated nydusd for each RAFS instance.
	DaemonModeDedicated DaemonMode = DaemonMode(constant.DaemonModeDedicated)
	// Share a global nydusd to serve all RAFS instances.
	DaemonModeShared DaemonMode = DaemonMode(constant.DaemonModeShared)
	// Do not spawn nydusd for RAFS instances.
	//
	// For tarfs and rund, there's no need to create nydusd to serve RAFS instances,
	// the snapshotter just returns mount slices with additional information for runC/runD
	// to manage those snapshots.
	DaemonModeNone    DaemonMode = DaemonMode(constant.DaemonModeNone)
	DaemonModeInvalid DaemonMode = DaemonMode(constant.DaemonModeInvalid)
	// MaxRootPathLen defines the maximum allowed length of the root portion of a Unix domain socket path.
	//
	// This value is calculated based on the hard length limit of `sun_path` on Linux systems (108 bytes).
	// Nydusd's socket path format is "${rootPath}/socket/${xid}/api?.sock".
	// - The length of the fixed part "/socket/${xid}/api?.sock" is 38 bytes.
	//
	// Since the maximum upper limit of the total path length is 108 bytes, in order to avoid exceeding the limit, the maximum allowed length of rootPath is:
	// 108 - len("/socket/${xid}/api?.sock") = 108 - 38 = 70.
	// Therefore, we must set the effective maximum length of the root path to 70 bytes.
	MaxRootPathLen = 70
)

type DaemonRecoverPolicy int

const (
	RecoverPolicyInvalid DaemonRecoverPolicy = iota
	RecoverPolicyNone
	RecoverPolicyRestart
	RecoverPolicyFailover
)

type DebugConfig struct {
	ProfileDuration int64  `toml:"daemon_cpu_profile_duration_secs"`
	PprofAddress    string `toml:"pprof_address"`
}

type Experimental struct {
	EnableStargz         bool        `toml:"enable_stargz"`
	EnableReferrerDetect bool        `toml:"enable_referrer_detect"`
	EnableIndexDetect    bool        `toml:"enable_index_detect"`
	TarfsConfig          TarfsConfig `toml:"tarfs"`
	EnableBackendSource  bool        `toml:"enable_backend_source"`
}

type GlobalConfig struct {
	SnapshotsDir     string
	DaemonMode       DaemonMode
	SocketRoot       string
	ConfigRoot       string
	RootMountpoint   string
	DaemonThreadsNum int
	MirrorsConfig    MirrorsConfig
	// contains filtered or unexported fields
}

type ImageConfig struct {
	PublicKeyFile     string `toml:"public_key_file"`
	ValidateSignature bool   `toml:"validate_signature"`
}

type LoggingConfig struct {
	LogToStdout         bool   `toml:"log_to_stdout"`
	LogLevel            string `toml:"level"`
	LogDir              string `toml:"dir"`
	RotateLogMaxSize    int    `toml:"log_rotation_max_size"`
	RotateLogMaxBackups int    `toml:"log_rotation_max_backups"`
	RotateLogMaxAge     int    `toml:"log_rotation_max_age"`
	RotateLogLocalTime  bool   `toml:"log_rotation_local_time"`
	RotateLogCompress   bool   `toml:"log_rotation_compress"`
}

type MetricsConfig struct {
	// Address is the network address for the metrics server. Empty indicates the server is disabled.
	Address string `toml:"address"`
	// HungIOInterval defines the timeout for a single I/O operation to be considered "hung".
	HungIOInterval time.Duration `toml:"hung_io_interval"`
	// CollectInterval defines how often metrics are collected and reported.
	CollectInterval time.Duration `toml:"collect_interval"`
}

type MirrorsConfig struct {
	Dir string `toml:"dir"`
}

type RemoteConfig struct {
	AuthConfig         AuthConfig    `toml:"auth"`
	ConvertVpcRegistry bool          `toml:"convert_vpc_registry"`
	SkipSSLVerify      bool          `toml:"skip_ssl_verify"`
	MirrorsConfig      MirrorsConfig `toml:"mirrors_config"`
}

type SnapshotConfig struct {
	EnableNydusOverlayFS bool   `toml:"enable_nydus_overlayfs"`
	NydusOverlayFSPath   string `toml:"nydus_overlayfs_path"`
	EnableKataVolume     bool   `toml:"enable_kata_volume"`
	SyncRemove           bool   `toml:"sync_remove"`
	// EnableOverlayfsVolatile globally enables the "volatile" overlayfs mount option
	// on all writable snapshots. This skips sync on the upper layer, improving
	// write performance for ephemeral container filesystems at the cost of crash consistency.
	EnableOverlayfsVolatile bool `toml:"enable_overlayfs_volatile"`
}

type SnapshotterConfig struct {
	// Configuration format version
	Version int `toml:"version"`
	// Snapshotter's root work directory
	Root    string `toml:"root"`
	Address string `toml:"address"`
	// UID to set on the snapshotter socket
	UID int `toml:"uid"`
	// GID to set on the snapshotter socket
	GID        int    `toml:"gid"`
	DaemonMode string `toml:"daemon_mode"`
	// Clean up all the resources when snapshotter is closed
	CleanupOnClose bool `toml:"cleanup_on_close"`

	SystemControllerConfig SystemControllerConfig `toml:"system"`
	MetricsConfig          MetricsConfig          `toml:"metrics"`
	DaemonConfig           DaemonConfig           `toml:"daemon"`
	SnapshotsConfig        SnapshotConfig         `toml:"snapshot"`
	RemoteConfig           RemoteConfig           `toml:"remote"`
	ImageConfig            ImageConfig            `toml:"image"`
	CacheManagerConfig     CacheManagerConfig     `toml:"cache_manager"`
	LoggingConfig          LoggingConfig          `toml:"log"`
	CgroupConfig           CgroupConfig           `toml:"cgroup"`
	Experimental           Experimental           `toml:"experimental"`
}

type SystemControllerConfig struct {
	Enable  bool   `toml:"enable"`
	Address string `toml:"address"`
	// UID to set on the system controller socket
	UID int `toml:"uid"`
	// GID to set on the system controller socket
	GID         int         `toml:"gid"`
	DebugConfig DebugConfig `toml:"debug"`
}

type TarfsConfig struct {
	EnableTarfs       bool   `toml:"enable_tarfs"`
	MountTarfsOnHost  bool   `toml:"mount_tarfs_on_host"`
	TarfsHint         bool   `toml:"tarfs_hint"`
	MaxConcurrentProc int    `toml:"max_concurrent_proc"`
	ExportMode        string `toml:"export_mode"`
}