SerhiiCho / timeago

import (

	"encoding/json"

	"errors"

	"io/ioutil"

	"log"

	"os"

	"strconv"

	"time"

)

func fileExists(filePath string) (bool, error) {

	_, err := os.Stat(filePath)

	if err == nil {

		return true, nil

	}

	if errors.Is(err, os.ErrNotExist) {

		return false, nil

	}

	return false, err

}

func getFileContent(filePath string) []byte {

	content, err := ioutil.ReadFile(filePath)

	if err != nil {

		log.Fatalln(err)

	}

	return content

}

func getTimestampOfPastDate(subDuration time.Duration) int {

	return int(time.Now().Add(-subDuration).UnixNano() / 1000000000)

}

func parseTimestampToTime(timestamp int) time.Time {

	return time.Unix(int64(timestamp), 0)

}

func getLastNumberDigit(num int) int {

	numStr := strconv.Itoa(num)

	result, _ := strconv.Atoi(numStr[len(numStr)-1:])

	return result

}

func parseJsonIntoLang(fileName string) lang {

	content := getFileContent(fileName)

	var result lang

	err := json.Unmarshal(content, &result)

	if err != nil {

		log.Fatalln(err)

	}

	return result

}