#!/bin/bash

echo "Removing unused Flatpak runtimes..."
sudo flatpak uninstall --system --unused -y --noninteractive
flatpak uninstall --user --unused -y --noninteractive

if command -v paccache &>/dev/null; then
  echo "Trimming pacman package cache..."
  sudo paccache -rk2
  sudo paccache -ruk0
fi

# Keep the newest 10 update logs and 3 install logs (refresh runs install.sh
# too). Their names sort oldest first.
keep_newest() {
  local keep="$1"
  shift
  (( $# > keep )) && rm -f -- "${@:1:$# - keep}"
  return 0
}
LOGS="$HOME/.local/state/coredesktop/logs"
shopt -s nullglob
keep_newest 10 "$LOGS"/update-*.log
keep_newest 3 "$LOGS"/install-*.log
shopt -u nullglob

# makepkg builds pkg-debug alongside an AUR package, and removing the package
# leaves it behind (asdf-vm-debug). Without its package it's no use to anyone,
# so remove it without asking. The exact name: pacman -Q herdr finds herdr-bin
mapfile -t STRAY_DEBUG < <(pacman -Qqm 2> /dev/null | grep -- '-debug$' | while read -r pkg; do
  [ "$(pacman -Qq "${pkg%-debug}" 2> /dev/null)" = "${pkg%-debug}" ] || echo "$pkg"
done)
if (( ${#STRAY_DEBUG[@]} > 0 )); then
  echo "Removing debug symbols for packages that are gone: ${STRAY_DEBUG[*]}"
  sudo pacman -R --noconfirm "${STRAY_DEBUG[@]}" || exit 1
fi

# Offer to remove packages that were installed as dependencies and are no
# longer needed (packages something lists as an optional dependency are kept).
# Ask first: one may be something you use directly. Without a terminal to ask
# on, keep them. To keep one for good: sudo pacman -D --asexplicit <package>
mapfile -t ORPHANS < <(pacman -Qtdq 2>/dev/null)
if (( ${#ORPHANS[@]} > 0 )); then
  echo "These packages were installed for something else, and nothing needs them any more:"
  printf '  %s\n' "${ORPHANS[@]}"
  if { : < /dev/tty; } 2> /dev/null && read -rp "Remove them? [y/N] " answer < /dev/tty \
      && [[ "$answer" == [yY]* ]]; then
    sudo pacman -Rns --noconfirm "${ORPHANS[@]}" || exit 1
    echo "To get one of these back, reinstall it with: sudo pacman -S <package>"
  else
    echo "Kept them. To keep one for good, so you're not asked again: sudo pacman -D --asexplicit <package>"
  fi
fi