/// Get system boot time
/// should fail on not-linux

package core

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
	"time"
)

type Time = time.Time

func GetBootTime() (Time, error) {
	file, err := os.Open("/proc/stat")
	if err != nil {
		return Time{}, err
	}

	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		line := scanner.Text()
		s_btime := "btime "
		if strings.HasPrefix(line, s_btime) {
			btime, err := strconv.ParseInt(line[len(s_btime):], 10, 64)
			if err != nil {
				return Time{}, err
			}
			return time.Unix(btime, 0), nil
		}
	}

	if err := scanner.Err(); err != nil {
		return Time{}, err
	}

	return Time{}, fmt.Errorf("btime (boot time) not found in /proc/stat")
}