#!/bin/sh
# socktop-swipe installer.
#
#   ./install.sh                 scripts + config + lisgd (build if missing)
#   ./install.sh --xignore       ...and tell X to ignore the touch panel
#   ./install.sh --i3            ...and add i3 autostart lines
#   ./install.sh --xignore --i3  full display-host setup
#
# Safe to re-run: an existing config file is never overwritten, and the i3 edit
# is skipped if already present.
set -eu

PREFIX=${PREFIX:-/usr/local}
BIN="$PREFIX/bin"
ETC="$PREFIX/etc"
CONF="$ETC/socktop-swipe.env"
XCONF=/etc/X11/xorg.conf.d/99-ignore-touch-socktop-swipe.conf
SRC="$HOME/src/lisgd"

here=$(cd "$(dirname "$0")" && pwd)
do_xignore=no
do_i3=no
for a in "$@"; do
	case "$a" in
	--xignore) do_xignore=yes ;;
	--i3) do_i3=yes ;;
	*) echo "unknown option: $a" >&2; exit 2 ;;
	esac
done

# --- lisgd ------------------------------------------------------------------
# libinput deliberately emits gesture events only for touchpads, never for
# touchscreens, so libinput-gestures and friends cannot work here. lisgd reads
# raw touch events and synthesises the swipes itself.
if command -v lisgd >/dev/null 2>&1; then
	echo "==> lisgd already installed: $(command -v lisgd)"
else
	echo "==> building lisgd"
	if command -v apt-get >/dev/null 2>&1; then
		sudo apt-get update
		sudo apt-get install -y build-essential pkg-config git libinput-dev libx11-dev
	else
		echo "!! Non-Debian system: ensure a C toolchain, libinput and libX11 headers"
		echo "!! are present, then re-run."
	fi
	mkdir -p "$(dirname "$SRC")"
	if [ -d "$SRC/.git" ]; then git -C "$SRC" pull --ff-only; else
		git clone https://git.sr.ht/~mil/lisgd "$SRC"
	fi
	# WITHOUT_WAYLAND: lisgd builds both backends by default and would otherwise
	# need libwayland-dev for code that never runs on an X11-only host.
	make -C "$SRC" WITHOUT_WAYLAND=1
	sudo make -C "$SRC" install WITHOUT_WAYLAND=1 PREFIX="$PREFIX"
fi

# --- scripts and config -----------------------------------------------------
echo "==> installing scripts to $BIN"
sudo install -d "$BIN" "$ETC"
sudo install -m 755 "$here/socktop-rack" "$here/socktop-swipe" "$here/socktop-gestures" "$BIN/"

if [ -e "$CONF" ]; then
	echo "==> keeping existing $CONF (not overwritten)"
else
	sudo install -m 644 "$here/config.env" "$CONF"
	echo "==> installed default config to $CONF"
	echo "    EDIT IT before first run if your hardware differs."
fi

# --- input group ------------------------------------------------------------
if id -nG | tr ' ' '\n' | grep -qx input; then
	echo "==> already in the 'input' group"
	relogin=no
else
	echo "==> adding $(id -un) to the 'input' group (lisgd reads /dev/input directly)"
	sudo usermod -aG input "$(id -un)"
	relogin=yes
fi

# --- optional: make X ignore the panel --------------------------------------
if [ "$do_xignore" = yes ]; then
	# shellcheck disable=SC1090
	. "$CONF"
	product=${XIGNORE_MATCH:-ILITEK}
	echo "==> telling X to ignore touch devices matching '$product'"
	sudo mkdir -p /etc/X11/xorg.conf.d
	sudo tee "$XCONF" >/dev/null <<EOF
# Installed by socktop-swipe.
# The panel is driven by lisgd via /dev/input, NOT through X. Letting X also
# deliver touch makes the terminal, tmux and socktop react to the same swipes
# the gesture daemon is interpreting. MatchProduct is narrow on purpose so it
# cannot match keyboards or other HID devices.
Section "InputClass"
    Identifier   "ignore touchscreen (socktop-swipe)"
    MatchProduct "$product"
    MatchIsTouchscreen "on"
    Option       "Ignore" "on"
EndSection
EOF
	echo "    wrote $XCONF (takes effect after X restarts)"
	relogin=yes
fi

# --- optional: i3 autostart -------------------------------------------------
if [ "$do_i3" = yes ]; then
	i3conf="$HOME/.config/i3/config"
	if [ ! -e "$i3conf" ]; then
		echo "!! $i3conf not found; skipping i3 autostart" >&2
	elif grep -q "socktop-gestures" "$i3conf"; then
		echo "==> i3 autostart already present; leaving it alone"
	else
		bak="$i3conf.bak-$(date +%Y%m%d-%H%M%S)"
		cp "$i3conf" "$bak"
		cat >>"$i3conf" <<EOF

# --- socktop-swipe --------------------------------------------------------
# Exactly ONE gesture daemon: lisgd does not grab the device exclusively, so a
# second instance makes every swipe fire twice.
exec --no-startup-id $BIN/socktop-gestures
exec --no-startup-id \$TERMINAL -e $BIN/socktop-rack
EOF
		if i3 -C -c "$i3conf" >/dev/null 2>&1; then
			echo "==> added i3 autostart (backup: $bak)"
			echo "    NOTE: set \$TERMINAL in your i3 config, or edit those lines"
			echo "    to your terminal's full path."
		else
			cp "$bak" "$i3conf"
			echo "!! i3 rejected the config; restored $bak" >&2
			i3 -C -c "$i3conf" || true
		fi
	fi
fi

echo
echo "=============================================================="
echo "Installed."
[ "$relogin" = yes ] && echo "LOG OUT and back in before use (group and/or X changes)."
cat <<EOF

Start it by hand with:
  $BIN/socktop-gestures &     # exactly one instance
  $BIN/socktop-rack           # builds and attaches the session

Configuration:  $CONF
Diagnostics:    tools/diag.sh
EOF
echo "=============================================================="