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

# ---------- paths ----------
SRC_DIR=$(pwd)                 # where the script is launched
APPDIR=/opt/navka-relay
VENV=$APPDIR/venv
SERVICE=$HOME/.config/systemd/user/navka-relay.service
USR=${SUDO_USER:-$USER}

green(){ printf '\e[1;32m==>\e[0m %s\n' "$*"; }

##############################################################################
green "1.  Packages (python + evdev) …"
##############################################################################
sudo pacman -Sy --needed --noconfirm python python-evdev >/dev/null

##############################################################################
green "2.  Install /opt/navka-relay …"
##############################################################################
sudo mkdir -p "$APPDIR"
sudo chown "$USR":"$USR" "$APPDIR"

# use a symlink when run from dev folder so edits are live
if [[ $SRC_DIR != "$APPDIR" ]]; then
  ln -sf "$SRC_DIR/navka-relay.sh" "$APPDIR/navka-relay.sh"
fi
chmod +x "$SRC_DIR/navka-relay.sh"

##############################################################################
green "3.  Build virtual-env (system pkgs visible) …"
##############################################################################
if [[ ! -d $VENV/bin ]]; then
  python -m venv --system-site-packages "$VENV"
fi

# ensure evdev importable inside venv (pacman pkg provides it; pip fallback)
"$VENV/bin/pip" install --quiet --disable-pip-version-check --upgrade pip >/dev/null
"$VENV/bin/python" - <<'PY'
import importlib, subprocess, sys
try:
    importlib.import_module('evdev')
except ImportError:
    subprocess.check_call([sys.executable, '-m', 'pip', 'install', 'evdev'])
PY

##############################################################################
green "4.  systemd *user* unit …"
##############################################################################
mkdir -p "$(dirname "$SERVICE")"
cat >"$SERVICE" <<EOF
[Unit]
Description=Navka keyboard relay
After=network.target

[Service]
Type=simple
ExecStart=/opt/navka-relay/navka-relay.sh
Restart=on-failure
EnvironmentFile=%h/.config/navka-relay.env

[Install]
WantedBy=default.target
EOF

systemctl --user daemon-reload
systemctl --user enable navka-relay >/dev/null 2>&1 || true

green "✔  Install complete"
cat <<'TXT'
Start relay : systemctl --user start navka-relay
Stop relay  : systemctl --user stop  navka-relay
Manual run  : /opt/navka-relay/navka-relay.sh
Variables   : NAVKA_IP=… NAVKA_PORT=… NAVKA_KBD=… navka-relay.sh
TXT