// +build linux

package process

import (
	"fmt"
	"strconv"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
)

func Test_Process_splitProcStat(t *testing.T) {
	expectedFieldsNum := 53
	statLineContent := make([]string, expectedFieldsNum-1)
	for i := 0; i < expectedFieldsNum-1; i++ {
		statLineContent[i] = strconv.Itoa(i + 1)
	}

	cases := []string{
		"ok",
		"ok)",
		"(ok",
		"ok )",
		"ok )(",
		"ok )()",
		"() ok )()",
		"() ok (()",
		" ) ok )",
		"(ok) (ok)",
	}

	consideredFields := []int{4, 7, 10, 11, 12, 13, 14, 15, 18, 22, 42}

	commandNameIndex := 2
	for _, expectedName := range cases {
		statLineContent[commandNameIndex-1] = "(" + expectedName + ")"
		statLine := strings.Join(statLineContent, " ")
		t.Run(fmt.Sprintf("name: %s", expectedName), func(t *testing.T) {
			parsedStatLine := splitProcStat([]byte(statLine))
			assert.Equal(t, expectedName, parsedStatLine[commandNameIndex])
			for _, idx := range consideredFields {
				expected := strconv.Itoa(idx)
				parsed := parsedStatLine[idx]
				assert.Equal(
					t, expected, parsed,
					"field %d (index from 1 as in man proc) must be %q but %q is received",
					idx, expected, parsed,
				)
			}
		})
	}
}