# shellcheck shell=bash

_mem_available=$(awk '/MemAvailable/ { printf "%.1f \n", $2/1024/1024 }' /proc/meminfo)
_package_status_cache="${XDG_CACHE_HOME:-$HOME/.cache}/package-status/status"
_package_status_attempt="${XDG_CACHE_HOME:-$HOME/.cache}/package-status/last-attempt"
_package_status_max_age=3600
_package_status_retry_delay=300
_package_status_version=""
_package_status_checked_at=""
_package_status_pacman_log_signature=""
_updates_available="0"
_orphans_available="0"

if [[ -r "$_package_status_cache" ]]; then
	while IFS='=' read -r _package_status_key _package_status_value; do
		case "$_package_status_key" in
			version) _package_status_version="$_package_status_value" ;;
			updates) _updates_available="$_package_status_value" ;;
			orphans) _orphans_available="$_package_status_value" ;;
			checked_at) _package_status_checked_at="$_package_status_value" ;;
			pacman_log_signature) _package_status_pacman_log_signature="$_package_status_value" ;;
		esac
	done < "$_package_status_cache"
fi

_package_status_now=$(date +%s)
_package_status_current_pacman_log_signature=$(stat -c '%Y:%s:%i' /var/log/pacman.log 2>/dev/null || echo '0:0:0')

if ! [[ "$_package_status_version" == "1" \
	&& "$_updates_available" =~ ^[0-9]+$ \
	&& "$_orphans_available" =~ ^[0-9]+$ \
	&& "$_package_status_checked_at" =~ ^[0-9]+$ \
	&& "$_package_status_pacman_log_signature" =~ ^[0-9]+:[0-9]+:[0-9]+$ \
	&& $_package_status_now -ge $_package_status_checked_at \
	&& $((_package_status_now - _package_status_checked_at)) -le $_package_status_max_age \
	&& "$_package_status_pacman_log_signature" == "$_package_status_current_pacman_log_signature" ]]; then
	_updates_available="0"
	_orphans_available="0"

	_package_status_attempt_time=$(stat -c %Y "$_package_status_attempt" 2>/dev/null || echo 0)
	if ! [[ "$_package_status_attempt_time" =~ ^[0-9]+$ \
		&& $_package_status_now -ge $_package_status_attempt_time \
		&& $((_package_status_now - _package_status_attempt_time)) -lt $_package_status_retry_delay ]]; then
		systemctl --user start --no-block package-status-refresh.service >/dev/null 2>&1 || true
	fi
fi

if declare -F _command_reminder >/dev/null 2>&1; then
	printf '%s\n' 'Remember commands:'
	printf '%b' "$_WHITE"
	_command_reminder
	printf '%b\n\n' "$_NC"
fi

if [[ ${_mem_available%.*} -lt 5 ]]; then
	printf 'Memory available:   %b' "$_YELLOW"
	[[ ${_mem_available%.*} -lt 3 ]] && printf '%b' "$_RED"
	printf '%sGB%b\n' "$_mem_available" "$_NC"
fi

if [[ $_updates_available -gt 0 ]]; then
	update_color="$_BRIGHT_WHITE"
	if [[ $_updates_available -gt 29 ]]; then
		update_color="$_RED"
	elif [[ $_updates_available -gt 15 ]]; then
		update_color="$_YELLOW"
	fi
	printf 'Updates available: %b%s%b [ update with: %bupdate%b ]\n' \
		"$update_color" "$_updates_available" "$_NC" "$update_color" "$_NC"
fi

if [[ $_orphans_available -gt 0 ]]; then
	orphan_color="$_BRIGHT_WHITE"
	if [[ $_orphans_available -gt 9 ]]; then
		orphan_color="$_RED"
	elif [[ $_orphans_available -gt 4 ]]; then
		orphan_color="$_YELLOW"
	fi
	printf 'Orphaned packages: %b%s%b [ remove with: %bsudo pacman -Rns $(pacman -Qdtq)%b ]\n' \
		"$orphan_color" "$_orphans_available" "$_NC" "$orphan_color" "$_NC"
fi

printf '\nRemember "%bTODO.md%b" (%bet%b) and "%bautonote.md%b" (%bea%b) files have content automatically displayed.\n\n' \
	"$_BLUE" "$_NC" "$_BLUE" "$_NC" "$_BLUE" "$_NC" "$_BLUE" "$_NC"

unset _mem_available _updates_available _orphans_available update_color orphan_color
unset _package_status_cache _package_status_attempt _package_status_max_age
unset _package_status_retry_delay _package_status_attempt_time _package_status_version
unset _package_status_checked_at _package_status_pacman_log_signature _package_status_now
unset _package_status_current_pacman_log_signature _package_status_key _package_status_value