#!/bin/bash -e
get_package_data() {
  name="${INPUT_File?File must be given to get-package-data}"
  echo PackageType=repo
  echo Name=$name
}

list_installed() {
  # Example pkg output:
  # Name         Version  Rev   Developer  Notes
  # core         16-2.30  3748  canonical  core
  # hello-world  6.3      27    canonical  -
  #
  # After rewrite:
  # Name=core
  # Version=16-2.30
  # Architecture=none
  snap list | sed 1d | awk '
{
    printf("Name=%s\n",$1)
    printf("Version=%s\n",$2)
    printf("Architecture=none\n")
}'
}

repo_install() {
  name="${INPUT_Name?Name must be given to repo-install}"
  # TODO: investigate channel, revision flags
  snap install "$name" >&2
}


list_updates() {
  # By default snaps are updated daily, at the time of this writing, there is no
  # way to disable the auto-update, but it can be delayed.

  # TODO: Get example output showing updates from `snap refresh --list`

  true
}

remove() {
  name="${INPUT_Name?Name must be given to remove}"
  snap remove "$name" >&2
}

main() {
  command=$1

  # Output maybe contain backslashes, and we don't want those to end up escaping
  # something so we use use -r with read.
  while read -r line; do
    # Note that line is a variable assignment, e.g.
    # INPUT_File=syncthing
    declare INPUT_$line
  done


  case $command in
    supports-api-version)
      echo 1
      ;;
    get-package-data)
      get_package_data
      ;;
    list-installed)
      list_installed
      ;;
    repo-install)
      repo_install
      ;;
    list-updates)
      list_updates
      ;;
    list-updates-local)
      list_updates
      ;;
    remove)
      remove
      ;;
    *)
      echo "ErrorMessage=Invalid operation"
  esac
}

main $1