#!/bin/sh
# Build a .deb package for gKeyMapper.
# Usage: scripts/make-deb.sh [version] [arch]
set -e

VERSION="${1:-0.1.2}"
ARCH="${2:-$(dpkg --print-architecture 2>/dev/null || echo amd64)}"
PACKAGE="gkeymapper"
STAGING="build/deb"
DEB_NAME="${PACKAGE}_${VERSION}_${ARCH}.deb"

# Build everything first.
make all translations

rm -rf "$STAGING"
mkdir -p "$STAGING/DEBIAN"

# Stage files with Debian layout (PREFIX=/usr).
make install DESTDIR="$STAGING" PREFIX=/usr

# Calculate installed size (in KB) for the control file.
INSTALLED_SIZE=$(du -sk "$STAGING" | cut -f1)

# Control file.
cat > "$STAGING/DEBIAN/control" <<EOF
Package: $PACKAGE
Version: $VERSION
Section: utils
Installed-Size: $INSTALLED_SIZE
Priority: optional
Architecture: $ARCH
Depends: libc6, libgtk-4-1, libxkbcommon0, libglib2.0-0, systemd, udev
Maintainer: gKeyMapper <gkeymapper@rager.dev>
Description: Remap G1-G9 keys of the Logitech G910
 A GTK4 GUI plus a background daemon for remapping the G1-G9 keys
 of a Logitech G910 keyboard to keys or commands.
EOF

# preinst: stop any running daemon and re-attach the kernel driver BEFORE
# upgrading.  The old (libusb-based) daemon detached the kernel driver from
# interface 1; if it was not stopped gracefully, the driver stays detached
# and the new (hidraw-based) daemon cannot find the device.
cat > "$STAGING/DEBIAN/preinst" <<'EOF'
#!/bin/sh
set -e
case "$1" in
    install|upgrade)
        # Stop any running daemon (old or new).
        for pid in $(pgrep -f gkeymapper-daemon 2>/dev/null); do
            kill "$pid" 2>/dev/null || true
        done
        sleep 1

        # Re-attach the kernel driver to interface 1 if it was detached by
        # an older (libusb-based) daemon.
        for _dev in /sys/bus/usb/devices/*; do
            _vendor=$(cat "$_dev/idVendor" 2>/dev/null) || continue
            _product=$(cat "$_dev/idProduct" 2>/dev/null) || continue
            case "$_vendor" in
                046d)
                    case "$_product" in
                        c32b|c335)
                            for _iface in "$_dev"/*:*; do
                                case "$_iface" in
                                    *:1.*)
                                        _name=$(basename "$_iface")
                                        if [ -w /sys/bus/usb/drivers/usbhid/bind ]; then
                                            echo "$_name" > /sys/bus/usb/drivers/usbhid/bind 2>/dev/null || true
                                        fi
                                        ;;
                                esac
                            done
                            ;;
                    esac
                    ;;
            esac
        done
        ;;
esac
exit 0
EOF
chmod 755 "$STAGING/DEBIAN/preinst"

# postinst: reload udev/systemd and enable the user daemon.
cat > "$STAGING/DEBIAN/postinst" <<'EOF'
#!/bin/sh
set -e
case "$1" in
    configure)
        if command -v udevadm >/dev/null 2>&1; then
            udevadm control --reload-rules 2>/dev/null || true
            udevadm trigger --subsystem-match=usb 2>/dev/null || true
            udevadm trigger --subsystem-match=input 2>/dev/null || true
        fi

        # Remove stale service file from old "make install" (PREFIX=/usr/local)
        # so the new one from /usr takes precedence.
        rm -f /usr/local/lib/systemd/user/gkeymapper-daemon.service

        # Re-attach the kernel driver to interface 1 if it was detached by an
        # older (libusb-based) daemon.  Without this the new (hidraw-based)
        # daemon cannot find /dev/hidraw for interface 1.
        for _dev in /sys/bus/usb/devices/*; do
            _vendor=$(cat "$_dev/idVendor" 2>/dev/null) || continue
            _product=$(cat "$_dev/idProduct" 2>/dev/null) || continue
            case "$_vendor" in
                046d)
                    case "$_product" in
                        c32b|c335)
                            for _iface in "$_dev"/*:*; do
                                case "$_iface" in
                                    *:1.*)
                                        _name=$(basename "$_iface")
                                        if [ -w /sys/bus/usb/drivers/usbhid/bind ]; then
                                            echo "$_name" > /sys/bus/usb/drivers/usbhid/bind 2>/dev/null || true
                                        fi
                                        ;;
                                esac
                            done
                            ;;
                    esac
                    ;;
            esac
        done

        # Helper: run a command as a given user with the D-Bus session bus
        # available.  "systemctl --user" needs DBUS_SESSION_BUS_ADDRESS, which
        # is not set in a plain "su -" login shell.
        run_as_user() {
            _user="$1"; shift
            _uid=$(id -u "$_user" 2>/dev/null) || return 1
            _bus="unix:path=/run/user/$_uid/bus"
            runuser -u "$_user" -- env DBUS_SESSION_BUS_ADDRESS="$_bus" "$@" 2>&1
        }

        _target_user=""
        if [ -n "$SUDO_USER" ]; then
            _target_user="$SUDO_USER"
        fi

        if [ -n "$_target_user" ]; then
            echo "gkeymapper: enabling daemon for user $_target_user ..."
            if run_as_user "$_target_user" systemctl --user daemon-reload; then
                echo "  daemon-reload: OK"
            else
                echo "  daemon-reload: FAILED (is the user session running?)"
            fi
            if run_as_user "$_target_user" systemctl --user enable --now gkeymapper-daemon; then
                echo "  enable --now gkeymapper-daemon: OK"
            else
                echo "  enable --now gkeymapper-daemon: FAILED"
                echo "  -> run manually: systemctl --user enable --now gkeymapper-daemon"
            fi
        else
            echo "gkeymapper: no installing user detected (SUDO_USER empty)."
            echo "  Enable the daemon manually with:"
            echo "    systemctl --user daemon-reload"
            echo "    systemctl --user enable --now gkeymapper-daemon"
            for _user in $(loginctl list-users --no-legend 2>/dev/null | awk '{print $2}'); do
                _uid=$(id -u "$_user" 2>/dev/null) || continue
                echo "  trying user $_user ..."
                run_as_user "$_user" systemctl --user daemon-reload >/dev/null 2>&1 || true
                run_as_user "$_user" systemctl --user enable --now gkeymapper-daemon >/dev/null 2>&1 || true
            done
        fi
        ;;
esac
exit 0
EOF

chmod 755 "$STAGING/DEBIAN/postinst"

# prerm: stop the daemon and re-attach the kernel driver before upgrading.
# The old (libusb-based) daemon detached the kernel driver from interface 1;
# if it was not stopped gracefully, the driver stays detached and the new
# (hidraw-based) daemon cannot find the device.
cat > "$STAGING/DEBIAN/prerm" <<'EOF'
#!/bin/sh
set -e
case "$1" in
    remove|upgrade|deconfigure)
        # Stop the daemon if running.
        if [ -n "$SUDO_USER" ]; then
            runuser -u "$SUDO_USER" -- systemctl --user stop gkeymapper-daemon >/dev/null 2>&1 || true
            runuser -u "$SUDO_USER" -- systemctl --user daemon-reload >/dev/null 2>&1 || true
        else
            for _user in $(loginctl list-users --no-legend 2>/dev/null | awk '{print $2}'); do
                runuser -u "$_user" -- systemctl --user stop gkeymapper-daemon >/dev/null 2>&1 || true
            done
        fi

        # Re-attach the kernel driver to interface 1 if it was detached by
        # an older (libusb-based) daemon.  Without this, the new daemon
        # (hidraw-based) cannot find /dev/hidraw for interface 1.
        for _dev in /sys/bus/usb/devices/*; do
            _vendor=$(cat "$_dev/idVendor" 2>/dev/null) || continue
            _product=$(cat "$_dev/idProduct" 2>/dev/null) || continue
            case "$_vendor" in
                046d)
                    case "$_product" in
                        c32b|c335)
                            for _iface in "$_dev"/*:*; do
                                case "$_iface" in
                                    *:1.*)
                                        _name=$(basename "$_iface")
                                        if [ -w /sys/bus/usb/drivers/usbhid/bind ]; then
                                            echo "$_name" > /sys/bus/usb/drivers/usbhid/bind 2>/dev/null || true
                                        fi
                                        ;;
                                esac
                            done
                            ;;
                    esac
                    ;;
            esac
        done
        ;;
esac
exit 0
EOF
chmod 755 "$STAGING/DEBIAN/prerm"

# postrm: disable the user daemon on removal.
cat > "$STAGING/DEBIAN/postrm" <<'EOF'
#!/bin/sh
set -e
case "$1" in
    remove|purge)
        if [ -n "$SUDO_USER" ]; then
            su - "$SUDO_USER" -c "systemctl --user disable --now gkeymapper-daemon" >/dev/null 2>&1 || true
            su - "$SUDO_USER" -c "systemctl --user daemon-reload" >/dev/null 2>&1 || true
        fi
        ;;
esac
exit 0
EOF
chmod 755 "$STAGING/DEBIAN/postrm"

# Fix ownership (files must be owned by root in a .deb).
# Strip debug symbols from binaries.
strip "$STAGING/usr/bin/gkeymapper" "$STAGING/usr/bin/gkeymapper-daemon" 2>/dev/null || true

# Remove generated cache files (they are regenerated on the target).
rm -f "$STAGING/usr/share/applications/mimeinfo.cache"
rm -f "$STAGING/usr/share/icons/hicolor/icon-theme.cache"
# Fix file permissions.
chmod 644 "$STAGING"/usr/share/applications/* 2>/dev/null || true
chmod 755 "$STAGING"/usr/bin/* 2>/dev/null || true

# Build the .deb.
dpkg-deb --root-owner-group --build "$STAGING" "$DEB_NAME"

echo ""
echo "Built: $DEB_NAME"