package cpu

import (
	"errors"
	"os/exec"
	"runtime"
	"strings"
	"testing"

	. "gopkg.in/check.v1"
)

func Test(t *testing.T) { TestingT(t) }

type MySuite struct{}

var _ = Suite(&MySuite{})

func hasCpuFeatureFromOS(feature string) (bool, error) {
	if runtime.GOOS == "linux" {
		command := exec.Command("/bin/cat", "/proc/cpuinfo")
		output, err := command.Output()
		if err != nil {
			return false, err
		}
		if strings.Contains(string(output), feature) {
			return true, nil
		} else {
			return false, nil
		}
	} else {
		// TODO find new way to test cpu flags on windows
		return false, errors.New("Not Implemented on this platform")
	}
}

func (s *MySuite) TestHasSSE41(c *C) {
	if runtime.GOOS == "linux" {
		var flag = HasSSE41()
		osCheck, err := hasCpuFeatureFromOS("sse4_1")
		c.Assert(err, IsNil)
		c.Check(flag, Equals, osCheck)
	}
}

func (s *MySuite) TestHasAVX(c *C) {
	if runtime.GOOS == "linux" {
		var flag = HasAVX()
		osFlag, err := hasCpuFeatureFromOS("avx")
		c.Assert(err, IsNil)
		c.Check(osFlag, Equals, flag)
	}
}

func (s *MySuite) TestHasAVX2(c *C) {
	if runtime.GOOS == "linux" {
		var flag = HasAVX2()
		osFlag, err := hasCpuFeatureFromOS("avx2")
		c.Assert(err, IsNil)
		c.Check(osFlag, Equals, flag)
	}
}