#!/usr/bin/env bash
# SPDX-License-Identifier: GPL-2.0-or-later
# Copyright (C) 2026 Bryan Joshua Pedini

# fake apt-mark (unit tests): hold state in $FAKE_DIR/holds (one name per line).
# FAKE_APT_MARK_LOCKED=N: the first N hold/unhold calls fail like dpkg's busy frontend lock.
# FAKE_APT_MARK_UNHOLD_SIGNAL=SIG: send SIG to the applet before an unhold (a second Ctrl-C).
# FAKE_APT_MARK_UNHOLD_RC=N: unhold fails (nothing released). FAKE_APT_MARK_FAIL_MSG: the message a
# failing hold prints. Every unhold logs whether $STATE_DIR/holds.lock is held by someone.
# showauto/showmanual: installed = the "?i" rows of data/apt/dpkg-status.tsv (not purged), auto = those
# listed in data/apt/auto.txt, manual = the others; FAKE_APT_MARK_NEITHER="pkg ..." are in neither
# list, FAKE_APT_MARK_SHOW_RC=N makes both fail. Like the real ones they print only the named
# packages (all of them without a name), native packages without their ":arch" qualifier.
# shellcheck source=../fakelib.bash
. "${BASH_SOURCE[0]%/*}/../fakelib.bash"
fake_log "$@"
h=$FAKE_DIR/holds
touch "$h"
verb=$1
shift
case $verb in hold | unhold)
	if [[ -n ${FAKE_APT_MARK_LOCKED:-} ]]; then
		n=$(cat "$FAKE_DIR/locked-calls" 2>/dev/null || echo 0)
		if ((n < FAKE_APT_MARK_LOCKED)); then
			echo $((n + 1)) >"$FAKE_DIR/locked-calls"
			echo "${FAKE_APT_MARK_LOCK_MSG:-dpkg: error: dpkg frontend lock was locked by another process with pid 4242}"
			echo "E: Sub-process dpkg --set-selections returned an error code (2)"
			echo "E: Executing dpkg failed. Are you root?"
			exit 100
		fi
	fi
	;;
esac
# show_marked auto|manual NAME...
show_marked() {
	local want=$1 n st name mark
	shift
	local -A pick=()
	for n in "$@"; do pick[${n%:all}]=1; done
	if [[ -n ${FAKE_APT_MARK_SHOW_RC:-} ]]; then
		echo "E: Unable to determine the package states" >&2
		exit "$FAKE_APT_MARK_SHOW_RC"
	fi
	while IFS=$'\t' read -r st name _; do
		[[ $st == ?i* ]] || continue
		fake_purged "$name" && continue
		[[ " ${FAKE_APT_MARK_NEITHER:-} " == *" $name "* ]] && continue
		if grep -qxF -- "$name" "$FAKE_DATA/apt/auto.txt"; then mark=auto; else mark=manual; fi
		[[ $mark == "$want" ]] || continue
		if (($# == 0)) || [[ -n ${pick[$name]:-} || -n ${pick[$name:amd64]:-} ]]; then printf '%s\n' "$name"; fi
	done <"$FAKE_DATA/apt/dpkg-status.tsv" | sort
}

case $verb in
showhold) sort "$h" ;;
showauto) show_marked auto "$@" ;;
showmanual) show_marked manual "$@" ;;
hold)
	for p in "$@"; do
		if grep -qxF -- "$p" "$h"; then echo "$p was already set on hold."; else
			echo "$p" >>"$h"
			echo "$p set on hold."
		fi
	done
	[[ -z ${FAKE_APT_MARK_FAIL_MSG:-} ]] || echo "$FAKE_APT_MARK_FAIL_MSG" >&2
	exit "$(fake_rc FAKE_APT_MARK_HOLD_RC 0)"
	;;
unhold)
	if [[ -n ${SKEPTICAL_UPDATER_STATE_DIR:-} && -e $SKEPTICAL_UPDATER_STATE_DIR/holds.lock ]] && command -v flock >/dev/null; then
		if flock -n "$SKEPTICAL_UPDATER_STATE_DIR/holds.lock" true; then l=free; else l=held; fi
		echo "holds.lock during unhold: $l" >>"$FAKE_LOG"
	fi
	if [[ -n ${FAKE_APT_MARK_UNHOLD_RC:-} ]]; then
		echo "E: Unable to correct problems" >&2
		exit "$FAKE_APT_MARK_UNHOLD_RC"
	fi
	if [[ -n ${FAKE_APT_MARK_UNHOLD_SIGNAL:-} ]]; then
		kill -s "$FAKE_APT_MARK_UNHOLD_SIGNAL" "$(cat "$FAKE_DIR/applet.pid" 2>/dev/null || echo "$PPID")" 2>/dev/null
		sleep 0.2
	fi
	for p in "$@"; do
		if grep -qxF -- "$p" "$h"; then
			grep -vxF -- "$p" "$h" >"$h.new" || true
			mv "$h.new" "$h"
			echo "Canceled hold on $p."
		else echo "$p was already not on hold."; fi
	done
	;;
*)
	echo "fake apt-mark: unhandled: $verb $*" >&2
	exit 99
	;;
esac