package gupta

import (
	"fmt"
	"testing"
)

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

	assertString(t, name, want, got)
}

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{
			LoadAvarage: 0.2,
			CPUUsage:    &cpustat,
			MemoryUsage: &Memory{},
		}

		got := report.CPUUsage.CPUUsage()
		want := float64(68.00)

		assertFloat64(t, "CPULoad", 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())

		assertString(t, "CPUUsage", got, "55.33")
	})
}

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

func assertFloat64(t *testing.T, name string, got, want float64) {
	if got != want {
		t.Errorf("got  %s %.2f want %.2f", name, got, want)
	}
}

func assertInt64(t *testing.T, name string, got, want uint64) {
	if got != want {
		t.Errorf("got %s %v want %v", name, got, want)
	}
}