package gothub

import (
	"bytes"
	"fmt"

	"github.com/spf13/cobra"

	"os"
	"os/exec"
	"runtime"
)

var updateCmd = &cobra.Command{
	Use:   "update",
	Short: "Update GotHub.",
	Long:  `This command checks for updates and re-builds GotHub. Does not work on Docker`,
	Run: func(cmd *cobra.Command, args []string) {
		update()
	},
}

func init() {
	rootCmd.AddCommand(updateCmd)
}

func update() {
	if os.Getenv("DOCKER") == "true" {
		fmt.Println("The GotHub update command does not work on Docker. Please re-create the container with a new image instead.")
		os.Exit(1)
	}
	gitPull := exec.Command("git", "pull")
	var out bytes.Buffer
	gitPull.Stdout = &out
	err := gitPull.Run()
	if out.String() == "Already up to date.\r" {
		fmt.Println("GotHub is already up to date.")
		os.Exit(0)
	}
	if err != nil {
		fmt.Println("Couldn't run Git pull. Are you using Git?", err)
		os.Exit(1)
	}
	if runtime.GOOS == "windows" {
		err := exec.Command("go", "build", "-o", "gothub.exe").Run()
		if err != nil {
			fmt.Println("Couldn't build GotHub.", err)
			os.Exit(1)
		} else {
			fmt.Println("GotHub updated successfully.")
			os.Exit(0)
		}
	} else {
		err := exec.Command("go", "build").Run()
		if err != nil {
			fmt.Println("Couldn't build GotHub.", err)
			os.Exit(1)
		} else {
			fmt.Println("GotHub updated successfully.")
			os.Exit(0)
		}
	}
}