#!/usr/bin/env bash

has() {
  local verbose=0
  if [[ $1 = '-v' ]]; then
    verbose=1
    shift
  fi
  for c; do c="${c%% *}"
    if ! command -v "$c" &> /dev/null; then
      (( "$verbose" > 0 )) && err "$c not found"
      return 1
    fi
  done
}

err() {
  printf "\e[31m%s\e[0m\n" "$*" >&2
}

die() {
  (( $# > 0 )) && err "$*"
  exit 1
}

select_from() {
  local cmd='command -v'
  for a; do
    case "$a" in
      -c)
        cmd="$2"
        shift 2
        ;;
    esac
  done
  for c; do
    if $cmd "${c%% *}" &> /dev/null; then
      echo "$c"
      return 0
    fi
  done
  return 1
}

has -v fzf || die

helper=$(select_from pacaur trizen packer apacman pacman)

mapfile -t pkgs < <(
  $helper -Qu --color=always |
  fzf --ansi -e -m --inline-info --cycle --reverse --bind='Ctrl-A:toggle-all' |
  awk '{print $3}'
)

count="${#pkgs[@]} package"
(( ${#pkgs[@]} > 1 )) && count+='s'
printf "upgrading %s: %s\n" "$count" "${pkgs[*]}"

(( ${#pkgs[@]} > 0 )) && $helper -S "${pkgs[@]}"