package zfs

import (
	"github.com/influxdata/telegraf"
)

type Sysctl func(metric string) ([]string, error)
type Zpool func() ([]string, error)
type Zdataset func(properties []string) ([]string, error)

type Zfs struct {
	KstatPath      string
	KstatMetrics   []string
	PoolMetrics    bool
	DatasetMetrics bool
	sysctl         Sysctl
	zpool          Zpool
	zdataset       Zdataset
	Log            telegraf.Logger `toml:"-"`
}

var sampleConfig = `
  ## ZFS kstat path. Ignored on FreeBSD
  ## If not specified, then default is:
  # kstatPath = "/proc/spl/kstat/zfs"

  ## By default, telegraf gather all zfs stats
  ## If not specified, then default is:
  # kstatMetrics = ["arcstats", "zfetchstats", "vdev_cache_stats"]
  ## For Linux, the default is:
  # kstatMetrics = ["abdstats", "arcstats", "dnodestats", "dbufcachestats",
  #   "dmu_tx", "fm", "vdev_mirror_stats", "zfetchstats", "zil"]
  ## By default, don't gather zpool stats
  # poolMetrics = false
  ## By default, don't gather zdataset stats
  # datasetMetrics = false
`

func (z *Zfs) SampleConfig() string {
	return sampleConfig
}

func (z *Zfs) Description() string {
	return "Read metrics of ZFS from arcstats, zfetchstats, vdev_cache_stats, pools and datasets"
}
