import ../model/config_type
import ../model/state_type
import ../notifier/notifier
import strutils, sequtils
import osproc
import times
import os
import nativesockets

const BORG_BIN = "borg"

proc genArchiveName(): string = 
  let hostname = getHostname()
  let ts = getTime().format("yyyy-MM-dd'T'HH:mm:ss'.'ffffff")
  return hostname & "-" & ts

proc genCommand(cmd: string, repo: string, others: seq[string]): string =
  var str = BORG_BIN & " " & cmd & " "
  str &= " " & repo & " "
  str &= others.join(" ")
  return str

proc run(cmd: string): int =
  echo "Trying to run : ", cmd
  try:
    let res = execProcess(cmd)
    echo res
  except:
    echo getCurrentExceptionMsg()

proc runDiscard(cmd: string): int = 
  echo "Trying to run : ", cmd
  try:
    let res = execCmd(cmd)
    return res
  except:
    echo getCurrentExceptionMsg()
  return 1

proc initRepo(nc: NorgConfig, repo: Repository): int = 
  return runDiscard genCommand(cmd = "init", repo = repo.path, others = nc.args.others)

proc backupSources(nc: NorgConfig, repo: Repository): int =
  let start_time = now()
  notify(nc.notifiers, state=Running)
  let others = concat(nc.source_dirs, nc.args.others)
  let archivename = repo.path & "::" & genArchiveName()
  let res = run genCommand(cmd = "create", repo = archivename, others = others)
  let end_time = now()
  let total = (end_time - start_time).inMilliSeconds()
  case res
  of 0:
    notify(nc.notifiers, state=Success, runtime=total)
  of 1:
    notify(nc.notifiers, state=Failure, runtime=total)
  else:
    notify(nc.notifiers, state=Failure, runtime=total)


proc listArchives(nc: NorgConfig, repo: Repository): int =
  return run genCommand(cmd = "list", repo = repo.path, others = nc.args.others)

proc mountArchive(nc: NorgConfig, repo: Repository): int =
  let archive = repo.path & "::" & nc.args.others[0]
  let others = nc.args.others[1..^1]
  let ok = runDiscard genCommand(cmd = "mount", repo = archive, others = others)
  if ok == 0:
    echo "Mounted ", archive, " at ", others[0]
  else:
    echo "Failed to mount ", archive

proc unmountArchive(nc: NorgConfig): int =
  let ok = runDiscard genCommand(cmd = "umount", repo = "", others = nc.args.others)
  if ok == 0:
    echo "Unmounted ", nc.args.others[0]
  else:
    echo "Failed to unmount ", nc.args.others[0]

proc isEmpty(dir: string): bool =
  var count = 0
  for idx, f in walkDir(dir): return false
  #count += 1
  return count == 0

proc extractArchive(nc: NorgConfig, repo: Repository): int =
  let archive = repo.path & "::" & nc.args.others[0]
  var others = nc.args.others[1..^1]
  if nc.args.extract_destination != "":
    discard existsOrCreateDir(nc.args.extract_destination)
    setCurrentDir(nc.args.extract_destination)
  let dir = getCurrentDir()
  if dir.isEmpty():
    echo "Restoring..."
    let ok = run(genCommand(cmd = "extract", repo = archive, others = others))
    return ok
  else:
    echo "Not restoring to non-empty destination\r\nPlease use the --destination flag"

proc execute*(nc: NorgConfig) =
  putEnv("BORG_PASSPHRASE", nc.getEncryptionPassword())
  for repo in nc.repositories:
    case nc.args.borg_cmd
    of "init":
      discard initRepo(nc, repo)
    of "backup":
      discard backupSources(nc, repo)
    of "create":
      discard backupSources(nc, repo)
    of "list":
      discard listArchives(nc, repo)
    of "mount":
      discard mountArchive(nc, repo)
    of "umount":
      discard unmountArchive(nc)
    of "extract":
      discard extractArchive(nc, repo)
  delEnv("BORG_PASSPHRASE")