package main

import (
	"bufio"
	"reflect"
	"strings"
	"testing"
)

var raw = "node,host=lousxps,cluster=test mem_used=4692.252,proc_total=1083,load_five=0.91,cpu_user=1.424336e+06,cpu_guest_nice=0,cpu_guest=0,mem_available=9829.848,mem_slab=514.796,mem_free=4537.956,proc_run=2,cpu_idle=2.1589764e+07,swap_total=0,mem_cached=6368.5,swap_free=0,load_fifteen=0.93,cpu_nice=196,cpu_softirq=41456,mem_buffers=489.992,mem_total=16088.7,load_one=0.84,cpu_system=517223,cpu_iowait=8994,cpu_steal=0,cpu_irq=113265,mem_sreclaimable=362.452 1629356936\n"
var expectedMeasurement = `node`
var expectedTags = map[string]string{
	"host":    "lousxps",
	"cluster": "test",
}
var expectedFields = []Metric{
	{"mem_used", 4692.252},
	{"proc_total", 1083},
	{"load_five", 0.91},
	{"cpu_user", 1.424336e+06},
	{"cpu_guest_nice", 0},
	{"cpu_guest", 0},
	{"mem_available", 9829.848},
	{"mem_slab", 514.796},
	{"mem_free", 4537.956},
	{"proc_run", 2},
	{"cpu_idle", 2.1589764e+07},
	{"swap_total", 0},
	{"mem_cached", 6368.5},
	{"swap_free", 0},
	{"load_fifteen", 0.93},
	{"cpu_nice", 196},
	{"cpu_softirq", 41456},
	{"mem_buffers", 489.992},
	{"mem_total", 16088.7},
	{"load_one", 0.84},
	{"cpu_system", 517223},
	{"cpu_iowait", 8994},
	{"cpu_steal", 0},
	{"cpu_irq", 113265},
	{"mem_sreclaimable", 362.452},
}
var expectedTimestamp int64 = 1629356936

func TestParseLine(t *testing.T) {
	line, err := Parse(raw)
	if err != nil {
		t.Error(err)
	}

	if line.Measurement != expectedMeasurement {
		t.Error("measurement not as expected")
	}

	if line.Ts.Unix() != int64(expectedTimestamp) {
		t.Error("timestamp not as expected")
	}

	if !reflect.DeepEqual(line.Tags, expectedTags) {
		t.Error("tags not as expected")
	}

	if !reflect.DeepEqual(line.Fields, expectedFields) {
		t.Error("fields not as expected")
	}
}

func BenchmarkParseLine(b *testing.B) {
	b.StopTimer()
	lines := strings.Repeat(raw, b.N)
	scanner := bufio.NewScanner(strings.NewReader(lines))
	scanner.Split(bufio.ScanLines)

	b.StartTimer()
	for i := 0; i < b.N; i++ {
		ok := scanner.Scan()
		if !ok {
			b.Error("woops")
			return
		}

		line := scanner.Text()
		_, err := Parse(line)
		if err != nil {
			b.Error(err)
			return
		}
	}
}