package cmd

import (
	"os"
	"fmt"
	//"log"
	"time"
)

const (
	fbsdUpdateConfig = `
	# $FreeBSD: releng/12.2/usr.sbin/freebsd-update/freebsd-update.conf 337338 2018-08-04 22:25:41Z brd $
	
	# Trusted keyprint.  Changing this is a Bad Idea unless you've received
	# a PGP-signed email from <security-officer@FreeBSD.org> telling you to
	# change it and explaining why.
	KeyPrint 800651ef4b4c71c27e60786d7b487188970f4b4169cc055784e21eb71d410cc5
	
	# Server or server pool from which to fetch updates.  You can change
	# this to point at a specific server if you want, but in most cases
	# using a "nearby" server won't provide a measurable improvement in
	# performance.
	ServerName update.FreeBSD.org
	
	# Components of the base system which should be kept updated.
	Components world
	
	# Example for updating the userland and the kernel source code only:
	# Components src/base src/sys world
	
	# Paths which start with anything matching an entry in an IgnorePaths
	# statement will be ignored.
	IgnorePaths
	
	# Paths which start with anything matching an entry in an IDSIgnorePaths
	# statement will be ignored by "freebsd-update IDS".
	IDSIgnorePaths /usr/share/man/cat
	IDSIgnorePaths /usr/share/man/whatis
	IDSIgnorePaths /var/db/locate.database
	IDSIgnorePaths /var/log
	
	# Paths which start with anything matching an entry in an UpdateIfUnmodified
	# statement will only be updated if the contents of the file have not been
	# modified by the user (unless changes are merged; see below).
	UpdateIfUnmodified /etc/ /var/ /root/ /.cshrc /.profile
	
	# When upgrading to a new FreeBSD release, files which match MergeChanges
	# will have any local changes merged into the version from the new release.
	MergeChanges /etc/
	
	### Default configuration options:
	
	# Directory in which to store downloaded updates and temporary
	# files used by FreeBSD Update.
	# WorkDir /var/db/freebsd-update
	
	# Destination to send output of "freebsd-update cron" if an error
	# occurs or updates have been downloaded.
	# MailTo root
	
	# Is FreeBSD Update allowed to create new files?
	# AllowAdd yes
	
	# Is FreeBSD Update allowed to delete files?
	# AllowDelete yes
	
	# If the user has modified file ownership, permissions, or flags, should
	# FreeBSD Update retain this modified metadata when installing a new version
	# of that file?
	# KeepModifiedMetadata yes
	
	# When upgrading between releases, should the list of Components be
	# read strictly (StrictComponents yes) or merely as a list of components
	# which *might* be installed of which FreeBSD Update should figure out
	# which actually are installed and upgrade those (StrictComponents no)?
	# StrictComponents no
	
	# When installing a new kernel perform a backup of the old one first
	# so it is possible to boot the old kernel in case of problems.
	# BackupKernel yes
	
	# If BackupKernel is enabled, the backup kernel is saved to this
	# directory.
	# BackupKernelDir /boot/kernel.old
	
	# When backing up a kernel also back up debug symbol files?
	# BackupKernelSymbolFiles no
	
	# Create a new boot environment when installing patches
	# CreateBootEnv yes
	`
)

// Internal usage only
func updateJail(jail *Jail) error {
	
	// Create default config as temporary file
	cfgFile, err := os.CreateTemp("", "gocage-jail-update-")
	if err != nil {
		return err
	}
	
	cfgFile.Write([]byte(fbsdUpdateConfig))
	
	defer cfgFile.Close()
	//defer os.Remove(cfgFile.Name())
	
	cmd := fmt.Sprintf("/usr/sbin/freebsd-update --not-running-from-cron -f %s -b %s --currently-running %s fetch install", 
					   cfgFile.Name(), jail.RootPath, jail.Config.Release)
	
	fmt.Printf("DEBUG: Prepare to execute \"%s\"\n", cmd)

	err = executeCommandWithOutputToStdout(cmd)
	if err != nil {
		return err
	}
	
	// Get and write new release into config.json
	
	
	return nil
}

func UpdateJail(args []string) {
	// Current jail were stopping
	var cj *Jail
	var err error

	for _, a := range args {
		// Check if jail exist and is distinctly named
		cj, err = getJailFromArray(a, gJails)
		if err != nil {
			fmt.Printf("Error getting jail: %s\n", err)
			continue
		}
		
		fmt.Printf("  > Snapshot jail %s\n", cj.Name)
		// Set snapshot name
		dt := time.Now()
		curDate := fmt.Sprintf("%s", dt.Format("2006-01-02_15-04-05"))
		gSnapshotName = fmt.Sprintf("goc_update_%s_%s", cj.Config.Release, curDate)
		err := createJailSnapshot(*cj)
		if err != nil {
			fmt.Printf("  > Snapshot jail %s: ERROR: %s\n", cj.Name, err.Error())
			return
		}
		fmt.Printf("  > Snapshot jail %s: OK\n", cj.Name)
		
		fmt.Printf("  > Update jail %s\n", cj.Name)
		err = updateJail(cj)
		if err != nil {
			fmt.Printf("ERROR: %s\n", err.Error())
		} else {
			fmt.Printf("  > Update jail %s: OK\n", cj.Name)
		}
	}
}