#!/bin/bash
#
# Purpose : Show which version of CoreDesktop this machine is running
#
# CoreDesktop is a rolling release, so its version is the date of the commit
# the local checkout is on, plus the short hash to tell same-day commits apart,
# e.g. 2026.10.22 (c5f0651). The kernel and video driver are shown separately
# because they come from Arch, not CoreDesktop, along with any newer release of
# either that update would install.
#
# Sibling projects (see sibling) are listed with their versions too. If any has
# a newer version, version asks, for each one, whether to update it now.
#
# version --check prints the newer version and exits 0 if one is available,
# exits 1 if this machine is up to date, or 2 if it couldn't check.

COREDESKTOP="$HOME/.local/share/coredesktop"

source "$COREDESKTOP/utils.sh"

if ! git -C "$COREDESKTOP" rev-parse --git-dir &> /dev/null; then
  echo "CoreDesktop isn't installed in $COREDESKTOP."
  exit 2
fi

# Version string for a commit, e.g. 2026.10.22 (c5f0651)
describe() {
  git -C "$COREDESKTOP" log -1 --format='%cd (%h)' --date=format:%Y.%m.%d "$1"
}

# Print the newer version if the remote has commits this checkout doesn't.
# Returns 1 if up to date, 2 if the remote couldn't be reached.
newer_version() {
  GIT_TERMINAL_PROMPT=0 timeout 30 git -C "$COREDESKTOP" fetch --quiet &> /dev/null || return 2
  local behind
  behind="$(git -C "$COREDESKTOP" rev-list --count 'HEAD..@{upstream}' 2> /dev/null)" || return 2
  (( behind > 0 )) || return 1
  describe '@{upstream}'
}

if [ "$1" = "--check" ]; then
  newer_version
  exit
fi

version="$(describe HEAD)"

# Local edits to the checkout mean this isn't exactly the version above
if [ -n "$(git -C "$COREDESKTOP" status --porcelain --untracked-files=no)" ]; then
  version="$version, modified"
fi

if latest="$(newer_version)"; then
  version="$version, $latest is available (run update)"
fi

# A version without its epoch and pkgrel, e.g. 1:26.2.6-1 is 26.2.6. Arch's
# kernel puts its suffix in the version too (7.2.14.arch1), so drop that.
upstream() {
  local v="${1#*:}"
  v="${v%-*}"
  echo "${v%.arch*}"
}

# Packages with a newer version in the repos, as "name old -> new" lines.
# checkupdates syncs a copy of the package database, so it needs no root and
# doesn't leave a partial upgrade behind. Empty if it couldn't check.
pending=""
if command -v checkupdates &> /dev/null; then
  pending="$(timeout 30 checkupdates 2> /dev/null)"
fi

# Print the newer upstream version of package $1 if the repos have one. A
# rebuild of the same version (only the pkgrel changed) doesn't count.
newer_package() {
  local name old _ new
  while read -r name old _ new; do
    [ "$name" = "$1" ] || continue
    [ "$(upstream "$old")" != "$(upstream "$new")" ] && upstream "$new"
    return
  done <<< "$pending"
  return 1
}

kernel="$(uname -r)"
# The package the running kernel came from (linux, linux-lts, ...)
kernel_pkg="$(cat "/usr/lib/modules/$kernel/pkgbase" 2> /dev/null)"
case "$kernel" in
  *-lts) kernel_pkg="${kernel_pkg:-linux-lts}" ;;
  *-zen) kernel_pkg="${kernel_pkg:-linux-zen}" ;;
  *-hardened) kernel_pkg="${kernel_pkg:-linux-hardened}" ;;
  *) kernel_pkg="${kernel_pkg:-linux}" ;;
esac

# If the running kernel's modules are gone, a newer kernel was installed
if [ ! -d "/usr/lib/modules/$kernel" ]; then
  kernel="$kernel (newer kernel installed, reboot to use it)"
fi
if latest="$(newer_package "$kernel_pkg")"; then
  kernel="$kernel, $latest is available (run update)"
fi

# NVIDIA's driver if nvidia.sh installed it, otherwise Mesa, which drives
# Intel and AMD graphics (vulkan-intel and vulkan-radeon are built with it)
driver=""
for pkg in nvidia-utils nvidia-580xx-utils mesa; do
  if installed="$(pacman -Q "$pkg" 2> /dev/null)"; then
    case "$pkg" in
      nvidia*) driver="NVIDIA $(upstream "${installed#* }")" ;;
      *) driver="Mesa $(upstream "${installed#* }")" ;;
    esac
    if latest="$(newer_package "$pkg")"; then
      driver="$driver, $latest is available (run update)"
    fi
    break
  fi
done

# 10-pacman.sh rewrites this log on every update
if [ -f "$PACMAN_UPDATE_LOG" ]; then
  last_update="$(date -r "$PACMAN_UPDATE_LOG" '+%Y-%m-%d %H:%M')"
else
  last_update="never"
fi

echo "CoreDesktop  $version"
echo "Kernel       $kernel"
[ -n "$driver" ] && echo "Video driver $driver"
echo "Last update  $last_update"

# Sibling projects, as "name<TAB>installed<TAB>available" lines (see sibling)
siblings="$(bash "$COREDESKTOP/sibling" check --porcelain 2> /dev/null)"
newer_siblings=()
if [ -n "$siblings" ]; then
  echo
  echo "Sibling projects"
  width=0
  while IFS=$'\t' read -r name _; do
    (( ${#name} > width )) && width=${#name}
  done <<< "$siblings"
  while IFS=$'\t' read -r name installed available; do
    case "$available" in
      "") ;;
      "?") installed="$installed, couldn't check for a newer version" ;;
      *)
        installed="$installed, $available is available"
        newer_siblings+=("$name"$'\t'"$available")
        ;;
    esac
    printf '  %-*s  %s\n' "$width" "$name" "$installed"
  done <<< "$siblings"
fi

# Packages newer than the mirror's last sync aren't shown above, or installed
if age="$(mirror_age_hours)" && (( age >= MIRROR_STALE_HOURS )); then
  if (( age >= 48 )); then ago="$(( age / 24 )) days"; else ago="$age hours"; fi
  echo
  echo -e "\e[33mYour package mirror ($(first_mirror)) last synced with Arch $ago ago, so"
  echo -e "newer packages may be missing. Run update to switch to up-to-date mirrors.\e[0m"
fi

# Offer each newer sibling, but only to someone at the terminal to answer
if (( ${#newer_siblings[@]} > 0 )) && [ -t 0 ] && [ -t 1 ]; then
  echo
  chosen=()
  for sibling in "${newer_siblings[@]}"; do
    IFS=$'\t' read -r name available <<< "$sibling"
    read -rp "Update $name to $available? [y/N] " response
    [[ "$response" =~ ^[yY]([eE][sS])?$ ]] && chosen+=("$name")
  done
  if (( ${#chosen[@]} > 0 )); then
    echo
    bash "$COREDESKTOP/sibling" update "${chosen[@]}"
    exit
  fi
fi