#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_DIR="$(cd -- "$SCRIPT_DIR/.." && pwd)"

SOURCE_DIR="$PROJECT_DIR/dist/car_ui"
INSTALL_DIR="/opt/car_ui"
SERVICE="car-ui.service"

DESKTOP_USER="cheykrym"
DESKTOP_DIR="/home/$DESKTOP_USER/Desktop"

LAUNCHER_SOURCE="$PROJECT_DIR/system_configs/Return_to_Car_UI.desktop"
LAUNCHER_TARGET="$DESKTOP_DIR/Return_to_Car_UI.desktop"

RETURN_HELPER_SOURCE="$PROJECT_DIR/scripts/return-to-car-mode.sh"
RETURN_HELPER_TARGET="/usr/local/bin/return-to-car-mode"

DEV_HELPER_SOURCE="$PROJECT_DIR/scripts/switch-to-dev-mode.sh"
DEV_HELPER_TARGET="/usr/local/bin/switch-to-dev-mode"

if [[ $EUID -ne 0 ]]; then
    echo "ERROR: deploy.sh must be run as root."
    echo
    echo "Run:"
    echo "  sudo $0"
    exit 1
fi

if [[ ! -x "$SOURCE_DIR/car_ui" ]]; then
    echo "ERROR: Build not found:"
    echo "       $SOURCE_DIR/car_ui"
    echo
    echo "Run scripts/build.sh first."
    exit 1
fi

if [[ ! -f "$LAUNCHER_SOURCE" ]]; then
    echo "ERROR: Desktop launcher not found:"
    echo "       $LAUNCHER_SOURCE"
    exit 1
fi

if [[ ! -f "$RETURN_HELPER_SOURCE" ]]; then
    echo "ERROR: Return-to-Car helper not found:"
    echo "       $RETURN_HELPER_SOURCE"
    exit 1
fi

if [[ ! -f "$DEV_HELPER_SOURCE" ]]; then
    echo "ERROR: Switch-to-Dev helper not found:"
    echo "       $DEV_HELPER_SOURCE"
    exit 1
fi

echo "==> Stopping $SERVICE"

systemctl stop "$SERVICE" 2>/dev/null || true

echo "==> Installing Car UI to $INSTALL_DIR"

rm -rf "$INSTALL_DIR"
mkdir -p "$INSTALL_DIR"
cp -a "$SOURCE_DIR/." "$INSTALL_DIR/"

echo "==> Installing system helpers"

install -o root -g root -m 755 \
    "$RETURN_HELPER_SOURCE" \
    "$RETURN_HELPER_TARGET"

install -o root -g root -m 755 \
    "$DEV_HELPER_SOURCE" \
    "$DEV_HELPER_TARGET"

echo "==> Installing desktop launcher"

mkdir -p "$DESKTOP_DIR"

install \
    -o "$DESKTOP_USER" \
    -g "$DESKTOP_USER" \
    -m 755 \
    "$LAUNCHER_SOURCE" \
    "$LAUNCHER_TARGET"

# Mark launcher as trusted for the desktop environment.
sudo -u "$DESKTOP_USER" \
    DBUS_SESSION_BUS_ADDRESS="unix:path=/run/user/$(id -u "$DESKTOP_USER")/bus" \
    gio set "$LAUNCHER_TARGET" metadata::trusted true 2>/dev/null || true

echo "==> Starting $SERVICE"

if [[ "$(systemctl get-default)" == "multi-user.target" ]]; then
    echo "==> Starting $SERVICE"
    systemctl start "$SERVICE"
else
    echo "==> Development mode detected"
    echo "    $SERVICE will not be started"
fi

echo
echo "==> Deployment complete"
echo "    Application:       $INSTALL_DIR/car_ui"
echo "    Return helper:     $RETURN_HELPER_TARGET"
echo "    Dev helper:        $DEV_HELPER_TARGET"
echo "    Desktop launcher:  $LAUNCHER_TARGET"