package main

import (
	"bytes"
	"fmt"
	"log"
	"os"
	"os/exec"
	"os/user"
	"strings"
)

func execSystem(cmd string, args ...string) []byte {
	com := exec.Command(cmd, args...)
	var out bytes.Buffer
	com.Stdout = &out
	com.Stderr = &out

	err := com.Run()

	if out.Bytes() == nil {
		fmt.Println(out.String())
		log.Fatal(err)
		return nil
	}

	return out.Bytes()
}

func isRoot() bool {
	currentUser, err := user.Current()
	if err != nil {
		log.Fatalf("[isRoot] Unable to get current user: %s", err)
	}
	return currentUser.Username == "root"
}

func main() {
	if !isRoot() {
		fmt.Println("this program needs root permissions!")
		os.Exit(-1)
	}

	disks := getDisks()
	fmt.Printf("Running smart check on %d disks.\n", len(disks.Blockdevices))
	for _, blockdevice := range disks.Blockdevices {
		path := fmt.Sprintf("/dev/%s", blockdevice.Name)
		info := getDiskInfo(path)

		diskstring := "HDD"
		if info.RotationRate == 0 {
			diskstring = "SSD"
		}
		fmt.Printf("\nChecking %s /dev/%s - %s %s\n", diskstring, blockdevice.Name, info.ModelFamily, info.ModelName)

		checkSmartAttributes(path, strings.Contains(strings.ToLower(info.ModelName+info.ModelFamily), strings.ToLower("Seagate")), info.RotationRate != 0)
	}
}