package influxdb_test

import (
	"testing"
	"time"

	"github.com/influxdb/influxdb"
)

func TestStats_SetAndGet(t *testing.T) {
	s := influxdb.NewStats("foo")

	s.Set("a", 100)
	if s.Get("a") != 100 {
		t.Fatalf("stats set failed, expected 100, got %d", s.Get("a"))
	}
}

func TestStats_Add(t *testing.T) {
	s := influxdb.NewStats("foo")

	s.Add("a", 200)
	if s.Get("a") != 200 {
		t.Fatalf("stats set failed, expected 200, got %d", s.Get("a"))
	}
}

func TestStats_Inc(t *testing.T) {
	s := influxdb.NewStats("foo")

	s.Set("a", 100)
	s.Inc("a")
	if s.Get("a") != 101 {
		t.Fatalf("stats Inc failed, expected 101, got %d", s.Get("a"))
	}

	s.Inc("b")
	if s.Get("b") != 1 {
		t.Fatalf("stats Inc failed, expected 1, got %d", s.Get("b"))
	}
}

func TestStats_AddNegative(t *testing.T) {
	s := influxdb.NewStats("foo")

	s.Add("a", -200)
	if s.Get("a") != -200 {
		t.Fatalf("stats set failed, expected -200, got %d", s.Get("a"))
	}
}

func TestStats_SetAndAdd(t *testing.T) {
	s := influxdb.NewStats("foo")

	s.Set("a", 100)
	s.Add("a", 200)
	if s.Get("a") != 300 {
		t.Fatalf("stats set failed, expected 300, got %d", s.Get("a"))
	}
}

func TestStats_Diff(t *testing.T) {
	foo := influxdb.NewStats("server")
	bar := influxdb.NewStats("server")

	foo.Set("a", 100)
	foo.Set("b", 600)
	bar.Set("a", 450)
	bar.Set("b", 525)

	qux := bar.Diff(foo)
	if qux.Name() != "server" {
		t.Fatalf("stats diff has unexpected name: %s", qux.Name())
	}
	if qux.Get("a") != 350 || qux.Get("b") != -75 {
		t.Fatalf("stats diff returned unexpected result: %v", qux)
	}
}

func TestStats_Snapshot(t *testing.T) {
	foo := influxdb.NewStats("server")
	foo.Set("a", 100)
	foo.Set("b", 600)

	bar := foo.Snapshot()
	if bar.Name() != "server" || bar.Get("a") != 100 || bar.Get("b") != 600 {
		t.Fatalf("stats snapshot returned unexpected result: %#v", bar)
	}
}

func TestStats_String(t *testing.T) {
	foo := influxdb.NewStats("server")
	foo.Set("a", 100)
	foo.Set("b", 600)

	if exp, got := `{"server":[{"a":100},{"b":600}]}`, foo.String(); exp != got {
		t.Log("exp: ", exp)
		t.Log("got: ", got)
		t.Fatalf("failed to get string")
	}
}

// TestStats_RaceCheck is meant to be run with race-detection enabled.
func TestStats_RaceCheck(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping long-runnning Stats race checking")
	}

	foo := influxdb.NewStats("server")
	foo.Set("a", 100)

	walker := func(s string, i int64) {
		if i == -1 {
			return // Will never happen.
		}
	}

	go func() {
		for {
			foo.Add("a", 1)
		}
	}()

	go func() {
		for {
			foo.Walk(walker)
		}
	}()

	time.Sleep(2 * time.Second)
	t.Log("TestStats_RaceCheck completed")
}