package gupta

import (
	"fmt"
	"testing"
)

func TestHello(t *testing.T) {
	got := Hello()
	want := fmt.Sprintf("Welcome to gupta version %s", version)
	name := "welcome string"

	if got != want {
		t.Errorf("got %s %s want %s", name, got, want)
	}
}

func TestRunGupta(t *testing.T) {
	// test that we get CPU load
	got := make([]float64, 3)
	got[0], got[1], got[2] = Run(true, true, true, "", "")
	want := []float64{0.2, 0.2, 70.0}

	for i, v := range got {
		if v != want[i] {
			t.Errorf("got %v want %v", v, want[i])
		}
	}
	// here it makes sense to return some kind of data structure
	// with properties filled.
	// having a data structure it would be possible to format
	// it to json ...
}

func TestCPUStat(t *testing.T) {
	//               0    1    2     3     4     5      6     7       8     9     10
	//               cpu user nice system idle iowait  irq  softirq steal guest guest_nice
	procstatLine := "cpu 4705 356  584    3699   23    23     0       0     0    0"
	procstatLineNew := "cpu 4875 356  584    3779   23    23     0       0     0    0"

	cpustat := NewCPUStat(procstatLine, procstatLineNew)

	t.Run("Test that gupta hast Report", func(t *testing.T) {

		// test we can get some report struct from gupta
		report := GuptaReport{
			cpuLoad:     0.2,
			cpuUsage:    0.2,
			memoryUsage: 70.0,
		}

		got := report.GetCPULoad()
		want := "0.20"
		name := "CPULoad"

		if got != want {
			t.Errorf("got %s %s want %s", name, got, want)
		}

	})

	t.Run("Test the CPUStat can read info", func(t *testing.T) {

		cpustat := CPUStat{}
		cpustat.ReadInfo([]string{
			"4705",
			"356",
			"584",
			"3699",
			"23",
			"23",
			"0",
			"0",
			"0",
			"0"})
		got := cpustat.user
		want := uint64(4705)
		name := "cpustat.user"
		assert(t, name, got, want)
	})

	t.Run("Test the NewCPUStat can create an instance", func(t *testing.T) {

		got := cpustat.user
		want := uint64(4705)
		name := "cpustat.user"
		assert(t, name, got, want)
	})

	t.Run("Test that Total CPUTime calculates properly", func(t *testing.T) {

		got := cpustat.TotalTime()
		want := cpustat.user + cpustat.nice + cpustat.system + cpustat.idle + cpustat.iowait +
			cpustat.irq + cpustat.softirq + cpustat.steal
		name := "total time"
		assert(t, name, got, want)
	})

	t.Run("Test that IdleTime calculates properly", func(t *testing.T) {

		got := cpustat.IdleTime()
		want := uint64(3722)
		name := "idle time"
		assert(t, name, got, want)

	})

	t.Run("Test that CPUUsage calculates properly", func(t *testing.T) {
		cpustat = NewCPUStat("cpu 657046 84 232824 4025519 2874 0 40555 0 0 0",
			"cpu 657136 84 232952 4025695 2874 0 40555 0 0 0")

		got := fmt.Sprintf("%.2f", cpustat.CPUUsage())
		want := "55.33"
		name := "CPUUsate"
		if got != want {
			t.Errorf("got  %s %s want %s", name, got, want)
		}

	})
}

func assert(t *testing.T, name string, got, want uint64) {
	if got != want {
		t.Errorf("got %s %v want %v", name, got, want)
	}
}