package lustre2

import (
	"io/ioutil"
	"os"
	"testing"

	"github.com/influxdata/telegraf/testutil"
	"github.com/stretchr/testify/require"
)

// Set config file variables to point to fake directory structure instead of /proc?

const obdfilterProcContents = `snapshot_time             1438693064.430544 secs.usecs
read_bytes                203238095 samples [bytes] 4096 1048576 78026117632000
write_bytes               71893382 samples [bytes] 1 1048576 15201500833981
get_info                  1182008495 samples [reqs]
set_info_async            2 samples [reqs]
connect                   1117 samples [reqs]
reconnect                 1160 samples [reqs]
disconnect                1084 samples [reqs]
statfs                    3575885 samples [reqs]
create                    698 samples [reqs]
destroy                   3190060 samples [reqs]
setattr                   605647 samples [reqs]
punch                     805187 samples [reqs]
sync                      6608753 samples [reqs]
preprw                    275131477 samples [reqs]
commitrw                  275131477 samples [reqs]
quotactl                  229231 samples [reqs]
ping                      78020757 samples [reqs]
`

const osdldiskfsProcContents = `snapshot_time             1438693135.640551 secs.usecs
get_page                  275132812 samples [usec] 0 3147 1320420955 22041662259
cache_access              19047063027 samples [pages] 1 1 19047063027
cache_hit                 7393729777 samples [pages] 1 1 7393729777
cache_miss                11653333250 samples [pages] 1 1 11653333250
`

const mdtProcContents = `snapshot_time             1438693238.20113 secs.usecs
open                      1024577037 samples [reqs]
close                     873243496 samples [reqs]
mknod                     349042 samples [reqs]
link                      445 samples [reqs]
unlink                    3549417 samples [reqs]
mkdir                     705499 samples [reqs]
rmdir                     227434 samples [reqs]
rename                    629196 samples [reqs]
getattr                   1503663097 samples [reqs]
setattr                   1898364 samples [reqs]
getxattr                  6145349681 samples [reqs]
setxattr                  83969 samples [reqs]
statfs                    2916320 samples [reqs]
sync                      434081 samples [reqs]
samedir_rename            259625 samples [reqs]
crossdir_rename           369571 samples [reqs]
`

func TestLustre2GeneratesMetrics(t *testing.T) {

	tempdir := os.TempDir() + "/telegraf/proc/fs/lustre/"
	ost_name := "OST0001"

	mdtdir := tempdir + "/mdt/"
	err := os.MkdirAll(mdtdir+"/"+ost_name, 0755)
	require.NoError(t, err)

	osddir := tempdir + "/osd-ldiskfs/"
	err = os.MkdirAll(osddir+"/"+ost_name, 0755)
	require.NoError(t, err)

	obddir := tempdir + "/obdfilter/"
	err = os.MkdirAll(obddir+"/"+ost_name, 0755)
	require.NoError(t, err)

	err = ioutil.WriteFile(mdtdir+"/"+ost_name+"/md_stats", []byte(mdtProcContents), 0644)
	require.NoError(t, err)

	err = ioutil.WriteFile(osddir+"/"+ost_name+"/stats", []byte(osdldiskfsProcContents), 0644)
	require.NoError(t, err)

	err = ioutil.WriteFile(obddir+"/"+ost_name+"/stats", []byte(obdfilterProcContents), 0644)
	require.NoError(t, err)

	m := &Lustre2{
		Ost_procfiles: []string{obddir + "/*/stats", osddir + "/*/stats"},
		Mds_procfiles: []string{mdtdir + "/*/md_stats"},
	}

	var acc testutil.Accumulator

	err = m.Gather(&acc)
	require.NoError(t, err)

	tags := map[string]string{
		"name": ost_name,
	}

	fields := map[string]interface{}{
		"cache_access":    uint64(19047063027),
		"cache_hit":       uint64(7393729777),
		"cache_miss":      uint64(11653333250),
		"close":           uint64(873243496),
		"crossdir_rename": uint64(369571),
		"getattr":         uint64(1503663097),
		"getxattr":        uint64(6145349681),
		"link":            uint64(445),
		"mkdir":           uint64(705499),
		"mknod":           uint64(349042),
		"open":            uint64(1024577037),
		"read_bytes":      uint64(78026117632000),
		"read_calls":      uint64(203238095),
		"rename":          uint64(629196),
		"rmdir":           uint64(227434),
		"samedir_rename":  uint64(259625),
		"setattr":         uint64(1898364),
		"setxattr":        uint64(83969),
		"statfs":          uint64(2916320),
		"sync":            uint64(434081),
		"unlink":          uint64(3549417),
		"write_bytes":     uint64(15201500833981),
		"write_calls":     uint64(71893382),
	}

	acc.AssertContainsTaggedFields(t, "lustre2", fields, tags)

	err = os.RemoveAll(os.TempDir() + "/telegraf")
	require.NoError(t, err)
}