#!/usr/bin/env bash
#
# Install (or upgrade) the MethdAI Receptionist systemd unit on the robot.
# Run on the robot itself (e.g. via ssh pollen@reachy-mini.local).
#
# Idempotent: re-running picks up edits to reachy-receptionist.service and
# restarts the live service.
#
# After install, useful commands:
#   systemctl status reachy-receptionist
#   journalctl -u reachy-receptionist -f
#   sudo systemctl restart reachy-receptionist
#   sudo systemctl disable --now reachy-receptionist
#
set -euo pipefail

UNIT_NAME="reachy-receptionist.service"
HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
SRC="$HERE/$UNIT_NAME"
DST="/etc/systemd/system/$UNIT_NAME"

if [[ ! -f "$SRC" ]]; then
    echo "✗ Unit file not found at $SRC" >&2
    exit 1
fi

# Re-elevate via `sudo bash <abs-path>` so we don't depend on the script
# having the executable bit set (git-from-Windows often drops it, and we
# want `bash deploy/install_systemd.sh` to Just Work).
if [[ "$(id -u)" -ne 0 ]]; then
    echo "↻ Re-running with sudo..."
    exec sudo --preserve-env=HOME bash "$HERE/$(basename "${BASH_SOURCE[0]}")" "$@"
fi

# Sanity check the runtime paths referenced by the unit file. Catching this
# now beats debugging a cryptic "ExecStart failed" later.
PYTHON_BIN="/venvs/apps_venv/bin/python"
PROJECT_DIR="/home/pollen/reachy_mini_receptionist"
if [[ ! -x "$PYTHON_BIN" ]]; then
    echo "✗ Python interpreter not found at $PYTHON_BIN" >&2
    echo "  Fix: install / locate the apps_venv before re-running." >&2
    exit 2
fi
if [[ ! -d "$PROJECT_DIR" ]]; then
    echo "✗ Project not found at $PROJECT_DIR" >&2
    exit 3
fi

echo "→ Installing $UNIT_NAME → $DST"
cp "$SRC" "$DST"
chmod 644 "$DST"

echo "→ Reloading systemd"
systemctl daemon-reload

echo "→ Enabling on boot"
systemctl enable "$UNIT_NAME"

echo "→ Restarting service"
systemctl restart "$UNIT_NAME"

# Brief wait so the status snapshot below shows a meaningful state
sleep 2

echo
echo "✓ Installed. Current status:"
echo "─────────────────────────────────────────"
systemctl --no-pager --lines=10 status "$UNIT_NAME" || true
echo "─────────────────────────────────────────"
echo
echo "Follow logs:    journalctl -u $UNIT_NAME -f"
echo "Manual restart: sudo systemctl restart $UNIT_NAME"
echo "Stop:           sudo systemctl stop $UNIT_NAME"
echo "Disable:        sudo systemctl disable --now $UNIT_NAME"