#!/bin/bash

# blob:summary=Update system and AUR packages
# blob:args=[--no-confirm]
# blob:requires-sudo=true

set -eE

confirm=true
[[ ${1-} == --no-confirm ]] && confirm=false

accent_color=4
muted_color=8
success_color=2
failure_color=1

total_steps=4
current_step=0
current_label="Checking for updates"
started_at=$SECONDS

repo_updates=""
aur_updates=""
counts_known=false
aur_reachable=false
reboot_needed=false
orphan_count=0

has_gum() {
  command -v gum &>/dev/null
}

styled() {
  local color="$1"
  shift
  if has_gum; then
    gum style --foreground "$color" "$@"
  else
    local argument
    for argument in "$@"; do
      [[ $argument == --* ]] || printf '%s\n' "$argument"
    done
  fi
}

line_count() {
  [[ -n $1 ]] || { echo 0; return; }
  grep -c . <<<"$1"
}

show_header() {
  if has_gum; then
    gum style --border rounded --border-foreground "$accent_color" --padding "0 2" --margin "1 0" \
      --bold "Blob Update" "$(date '+%A %-d %B, %H:%M')"
  else
    printf '\nBlob Update - %s\n\n' "$(date '+%A %-d %B, %H:%M')"
  fi
}

begin_step() {
  current_step=$((current_step + 1))
  current_label="$1"
  echo
  styled "$accent_color" --bold "[$current_step/$total_steps] $1"
}

skip_step() {
  begin_step "$1"
  styled "$muted_color" "  $2"
}

report_failure() {
  trap - ERR
  echo
  styled "$failure_color" --bold "Update failed while: $current_label"
  blob-notify-send -u critical "Update failed" "Stopped while: $current_label" || true
  exit 1
}

trap report_failure ERR

print_update_list() {
  local title="$1" updates="$2"
  styled "$accent_color" --bold "$title ($(line_count "$updates"))"
  if [[ -z $updates ]]; then
    styled "$muted_color" "  none"
    return
  fi
  awk '{ printf "  %-34s %s -> %s\n", $1, $2, $4 }' <<<"$updates"
}

gather_pending() {
  if has_gum; then
    gum spin --spinner dot --title "Checking the AUR..." -- blob-pkg-aur && aur_reachable=true || true
  else
    echo "Checking the AUR..."
    blob-pkg-aur && aur_reachable=true || true
  fi

  blob-cmd-present checkupdates || return 0
  counts_known=true

  local check_status=0
  if has_gum; then
    repo_updates=$(gum spin --spinner dot --title "Checking for system updates..." --show-output -- checkupdates 2>/dev/null) || check_status=$?
  else
    echo "Checking for system updates..."
    repo_updates=$(checkupdates 2>/dev/null) || check_status=$?
  fi

  if (( check_status == 1 )); then
    counts_known=false
    repo_updates=""
    styled "$muted_color" "Could not check for system updates; updating anyway."
    return 0
  fi

  if blob-cmd-present yay && [[ $aur_reachable == true ]]; then
    aur_updates=$(yay -Qua 2>/dev/null || true)
  fi

  if grep -qE '^linux(-lts|-zen|-hardened)? ' <<<"$repo_updates"; then
    reboot_needed=true
  fi
}

show_pending() {
  [[ $counts_known == true ]] || return 0
  echo
  print_update_list "System packages" "$repo_updates"
  echo
  if blob-cmd-present yay && [[ $aur_reachable == true ]]; then
    print_update_list "AUR packages" "$aur_updates"
  else
    styled "$muted_color" "AUR packages: not checked"
  fi
}

confirm_update() {
  [[ $confirm == true ]] || return 0
  echo
  local question="Update system and AUR packages?"
  if [[ $counts_known == true ]]; then
    question="Install $(( $(line_count "$repo_updates") + $(line_count "$aur_updates") )) update(s)?"
  fi
  if has_gum; then
    gum confirm "$question" || exit 0
  else
    local answer
    read -rp "$question [y/N] " answer
    [[ $answer == [yY] ]] || exit 0
  fi
}

format_duration() {
  local seconds=$1
  if (( seconds >= 60 )); then
    printf '%dm %ds' $((seconds / 60)) $((seconds % 60))
  else
    printf '%ds' "$seconds"
  fi
}

show_summary() {
  local elapsed
  elapsed=$(format_duration $((SECONDS - started_at)))

  echo
  if has_gum; then
    local summary_lines=()
    if [[ $counts_known == true ]]; then
      summary_lines+=("System packages   $(line_count "$repo_updates")")
      summary_lines+=("AUR packages      $(line_count "$aur_updates")")
    fi
    summary_lines+=("Orphans removed   $orphan_count")
    summary_lines+=("Time              $elapsed")
    gum style --border rounded --border-foreground "$success_color" --padding "0 2" \
      "$(gum style --foreground "$success_color" --bold "Update complete")" "" "${summary_lines[@]}"
  else
    echo "Update complete in $elapsed."
    [[ $counts_known == true ]] && echo "System: $(line_count "$repo_updates"), AUR: $(line_count "$aur_updates"), orphans removed: $orphan_count"
  fi

  if [[ $reboot_needed == true ]]; then
    echo
    styled "$accent_color" --bold "A new kernel was installed. Reboot to start using it."
  fi
}

show_header
gather_pending

if [[ $counts_known == true && -z $repo_updates && -z $aur_updates ]]; then
  echo
  styled "$success_color" --bold "Everything is up to date."
  if blob-cmd-present yay && [[ $aur_reachable != true ]]; then
    styled "$muted_color" "The AUR was not reachable, so AUR packages were not checked."
  fi
  exit 0
fi

show_pending
confirm_update

blob-sudo-keepalive

begin_step "Refreshing the keyring"
sudo pacman -Sy --needed --noconfirm archlinux-keyring

begin_step "Updating system packages"
sudo pacman -Syu --noconfirm

if ! blob-cmd-present yay; then
  skip_step "Updating AUR packages" "Skipped: yay is not installed"
elif [[ $aur_reachable != true ]]; then
  skip_step "Updating AUR packages" "Skipped: the AUR is not reachable"
else
  begin_step "Updating AUR packages"
  yay -Sua --noconfirm
fi

begin_step "Removing orphaned packages"
orphans=$(pacman -Qtdq 2>/dev/null || true)
if [[ -n $orphans ]]; then
  orphan_count=$(line_count "$orphans")
  printf '%s\n' "$orphans" | sudo pacman -Rns --noconfirm -
else
  styled "$muted_color" "  None to remove"
fi

show_summary

notify_body="System and AUR packages are up to date"
[[ $reboot_needed == true ]] && notify_body="$notify_body. Reboot to use the new kernel."
blob-notify-send "Update complete" "$notify_body"