/*
Copyright © 2022 Lukas Bachschwell <lukas@lbsfilm.at>

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package cmd

import (
	"os"
	"os/exec"
	"path/filepath"

	log "github.com/s00500/env_logger"
	"github.com/spf13/cobra"
)

var serviceTemplate string
var serviceBootLevel string

// serviceCmd represents the service command
var serviceCmd = &cobra.Command{
	Use:   "service",
	Short: "A brief description of your command",
	Long: `A longer description that spans multiple lines and likely contains examples
and usage of using your command. For example:

Cobra is a CLI library for Go that empowers applications.
This application is a tool to generate the needed files
to quickly create a Cobra application.`,
	Run: func(cmd *cobra.Command, args []string) {
		log.Println("service called")

		if len(args) == 0 {
			log.Fatal("Please specify a service name")
		}
		name := args[0]

		prepareWorkdir()
		// Make changes:
		// Edit the servicefile

		if serviceBootLevel != "" {
			log.Info("Setting boot level to ", serviceBootLevel)
			if serviceBootLevel == "none" {
				dirs, err := os.ReadDir(workdir + "/etc/runlevels")
				log.MustFatal(err)
				for _, dir := range dirs {
					log.Info("Checking ", filepath.Join(dir.Name(), name))
					os.RemoveAll(filepath.Join(dir.Name(), name))
				}

				createOutput()
				return
			}

			err := os.Symlink("/etc/init.d/"+name, filepath.Join(workdir, "etc", "runlevels", serviceBootLevel, name))
			log.MustFatal(err)
			createOutput()
			return
		}

		err := os.MkdirAll(workdir+"/etc/init.d", 0755)
		log.MustFatal(err)

		if serviceTemplate != "" {
			// Copy over template file from embed fs to service location
			err = copyEmbeddedFile("templates/service/"+serviceTemplate, workdir+"/etc/init.d/"+name)
			log.MustFatal(err)
		}

		editFile(workdir + "/etc/init.d/" + name)
		log.Should(os.Chmod(workdir+"/etc/init.d/"+name, 0755))

		createOutput()
	},
}

func init() {
	rootCmd.AddCommand(serviceCmd)

	serviceCmd.Flags().StringVarP(&serviceTemplate, "template", "t", "", "Create new service from a template")
	serviceCmd.Flags().StringVar(&serviceBootLevel, "boot", "", "Specify a boot level, use 'none' for disable")
}

func editFile(path string) {
	editor := os.Getenv("EDITOR")
	if editor == "" {
		editor = "nano"
		log.Info("EDITOR: nano (default)")
	} else {
		log.Info("EDITOR: ", editor)
	}

	editC := exec.Command(editor, path)
	log.Debug("Calling ", editC)
	editC.Stdout = os.Stdout
	editC.Stdin = os.Stdin
	editC.Stderr = os.Stderr

	log.Should(editC.Start())
	log.Should(editC.Wait())
}