#!/usr/bin/env bash
# Deploy screen-brightness daemon to an existing reTerminal DM.
#
# Usage:
#   On device (local files in current directory):
#     sudo ./deploy-screen-brightness-to-device.sh
#
#   On device (download from file server) — use ONE of these (sudo often strips env):
#     sudo ./deploy-screen-brightness-to-device.sh "http://file.server:5000/files"
#     sudo -E BOOTSTRAP_URL="http://file.server:5000/files" ./deploy-screen-brightness-to-device.sh
#
#   From host (deploy via SSH; repo files used from ../cloud-init/fileserver/):
#     ./deploy-screen-brightness-to-device.sh [user@]hostname
#
#   From host via jump server (bastion):
#     SSH_JUMP_HOST="user@jump.example.com" ./deploy-screen-brightness-to-device.sh pi@10.0.0.5
#   Or in ~/.ssh/config set ProxyJump for the device; then no env var needed.
#
# Does not overwrite existing /etc/screen-brightness.conf (keeps vessel tuning).
# See docs/SCREEN-BRIGHTNESS-MANUAL-SETUP.md for full manual steps.

set -e

# Unconditional first output so we know the script is running (helps if run via sudo)
echo "screen-brightness deploy: starting..."

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]:-.}")" && pwd)"
FILESERVER_DIR="$(cd "$SCRIPT_DIR/../cloud-init/fileserver" 2>/dev/null && pwd)"
ARG1="${1:-}"

# If first argument looks like a URL (not user@host), use it as BOOTSTRAP_URL
if [[ -n "$ARG1" && "$ARG1" == http* && "$ARG1" != *"@"* ]]; then
  BOOTSTRAP_URL="${ARG1%/}"   # strip trailing slash for clean ${URL}/${name}
  REMOTE=""
else
  REMOTE="$ARG1"
fi

# Require root for local install
if [[ -z "$REMOTE" && "$(id -u)" -ne 0 ]]; then
  echo "This script must be run as root for local install. Use: sudo $0 ${1:-}" >&2
  exit 1
fi

# ── Remote deploy (from host via SSH) ─────────────────────────────────────────
# REMOTE is set when first arg is not a URL (e.g. pi@device or Host alias from ~/.ssh/config)
if [[ -n "$REMOTE" ]]; then
  if [[ ! -d "$FILESERVER_DIR" ]]; then
    echo "ERROR: Fileserver dir not found: $FILESERVER_DIR" >&2
    exit 1
  fi
  # Optional: deploy via jump server (e.g. SSH_JUMP_HOST="user@jump.example.com")
  SSH_OPTS=()
  SCP_OPTS=()
  if [[ -n "${SSH_JUMP_HOST:-}" ]]; then
    SSH_OPTS=(-J "$SSH_JUMP_HOST")
    SCP_OPTS=(-o "ProxyJump=$SSH_JUMP_HOST")
    echo "Using jump host: $SSH_JUMP_HOST"
  fi
  echo "Deploying screen-brightness + overlay to $REMOTE (from $FILESERVER_DIR) ..."
  ssh "${SSH_OPTS[@]}" "${REMOTE}" "mkdir -p /tmp/screen-brightness-deploy"
  scp -q "${SCP_OPTS[@]}" \
    "$FILESERVER_DIR/screen-brightness.py" \
    "$FILESERVER_DIR/screen-brightness.service" \
    "$FILESERVER_DIR/screen-brightness.conf" \
    "$FILESERVER_DIR/brightness-api.py" \
    "$FILESERVER_DIR/brightness-api.service" \
    "$FILESERVER_DIR/brightness-overlay.py" \
    "$FILESERVER_DIR/brightness-overlay-launch.sh" \
    "$FILESERVER_DIR/brightness-overlay.desktop" \
    "${REMOTE}:/tmp/screen-brightness-deploy/"
  ssh "${SSH_OPTS[@]}" "${REMOTE}" "sudo bash -s" << 'REMOTE_SCRIPT'
set -e
cd /tmp/screen-brightness-deploy
install -m 755 screen-brightness.py /usr/local/bin/screen-brightness.py
install -m 644 screen-brightness.service /etc/systemd/system/screen-brightness.service
[[ ! -f /etc/screen-brightness.conf ]] && install -m 644 screen-brightness.conf /etc/screen-brightness.conf || true
mkdir -p /run/screen-brightness
printf '%s\n' 'd /run/screen-brightness 0755 root root -' > /etc/tmpfiles.d/screen-brightness.conf
systemctl daemon-reload
systemctl enable screen-brightness.service
systemctl restart screen-brightness.service
echo "Installed and restarted screen-brightness.service"

# Brightness API (for overlay)
install -m 755 brightness-api.py /usr/local/bin/brightness-api.py
install -m 644 brightness-api.service /etc/systemd/system/brightness-api.service
systemctl daemon-reload
systemctl enable brightness-api.service
systemctl restart brightness-api.service
echo "Installed and restarted brightness-api.service"

# Overlay (crew manual control) — install for user pi
OVERLAY_USER=pi
OVERLAY_HOME=/home/$OVERLAY_USER
if [[ -f brightness-overlay.py && -f brightness-overlay.desktop ]] && id "$OVERLAY_USER" &>/dev/null; then
  install -m 755 brightness-overlay.py "$OVERLAY_HOME/brightness-overlay.py"
  [[ -f brightness-overlay-launch.sh ]] && install -m 755 brightness-overlay-launch.sh "$OVERLAY_HOME/brightness-overlay-launch.sh"
  mkdir -p "$OVERLAY_HOME/.config/autostart"
  sed "s|/home/pi|$OVERLAY_HOME|g" brightness-overlay.desktop > "$OVERLAY_HOME/.config/autostart/brightness-overlay.desktop"
  chown -R "$OVERLAY_USER:$OVERLAY_USER" "$OVERLAY_HOME/brightness-overlay.py" "$OVERLAY_HOME/brightness-overlay-launch.sh" "$OVERLAY_HOME/.config/autostart/brightness-overlay.desktop" 2>/dev/null || true
  echo "Installed brightness overlay for $OVERLAY_USER (autostart; starts ~6s after login)"
else
  echo "Skipped overlay (files missing or user $OVERLAY_USER not found)"
fi
REMOTE_SCRIPT
  ssh "${SSH_OPTS[@]}" "${REMOTE}" "rm -rf /tmp/screen-brightness-deploy"
  echo "Done. Check: ssh ${SSH_OPTS[*]} $REMOTE systemctl status screen-brightness.service"
  exit 0
fi

# ── Local deploy (on device) ─────────────────────────────────────────────────
if [[ -n "${BOOTSTRAP_URL:-}" ]]; then
  echo "Downloading from $BOOTSTRAP_URL ..."
  DOWNLOAD_DIR="/tmp/screen-brightness-deploy"
  mkdir -p "$DOWNLOAD_DIR"
  REQUIRED="screen-brightness.py screen-brightness.service screen-brightness.conf"
  OPTIONAL="brightness-api.py brightness-api.service brightness-overlay.py brightness-overlay-launch.sh brightness-overlay.desktop"
  for name in $REQUIRED; do
    url="${BOOTSTRAP_URL}/${name}"
    if ! curl -fSL "$url" -o "$DOWNLOAD_DIR/$name" 2>/tmp/screen-brightness-curl-err; then
      echo "ERROR: Failed to download $url" >&2
      [[ -s /tmp/screen-brightness-curl-err ]] && cat /tmp/screen-brightness-curl-err >&2
      rm -f /tmp/screen-brightness-curl-err
      rm -rf "$DOWNLOAD_DIR"
      exit 1
    fi
    rm -f /tmp/screen-brightness-curl-err
    echo "  $name OK"
  done
  for name in $OPTIONAL; do
    url="${BOOTSTRAP_URL}/${name}"
    if curl -fSL "$url" -o "$DOWNLOAD_DIR/$name" 2>/dev/null; then
      echo "  $name OK"
    fi
  done
  DEPLOY_DIR="$DOWNLOAD_DIR"
else
  if [[ -f "$SCRIPT_DIR/screen-brightness.py" ]]; then
    DEPLOY_DIR="$SCRIPT_DIR"
  elif [[ -d "$FILESERVER_DIR" && -f "$FILESERVER_DIR/screen-brightness.py" ]]; then
    DEPLOY_DIR="$FILESERVER_DIR"
  else
    # Assume files are in current directory
    DEPLOY_DIR="$(pwd)"
  fi
  if [[ ! -f "$DEPLOY_DIR/screen-brightness.py" ]]; then
    echo "ERROR: screen-brightness.py not found." >&2
    echo "  Run from a directory containing screen-brightness.py, .service, .conf" >&2
    echo "  Or set BOOTSTRAP_URL to download from a file server." >&2
    exit 1
  fi
  echo "Using files from: $DEPLOY_DIR"
fi

install -m 755 "$DEPLOY_DIR/screen-brightness.py" /usr/local/bin/screen-brightness.py
install -m 644 "$DEPLOY_DIR/screen-brightness.service" /etc/systemd/system/screen-brightness.service

if [[ ! -f /etc/screen-brightness.conf ]]; then
  install -m 644 "$DEPLOY_DIR/screen-brightness.conf" /etc/screen-brightness.conf
  echo "Installed /etc/screen-brightness.conf"
else
  echo "Keeping existing /etc/screen-brightness.conf"
fi

mkdir -p /run/screen-brightness
printf '%s\n' 'd /run/screen-brightness 0755 root root -' > /etc/tmpfiles.d/screen-brightness.conf

systemctl daemon-reload
systemctl enable screen-brightness.service
systemctl restart screen-brightness.service
echo "Installed and restarted screen-brightness.service"

# Brightness API (for overlay)
if [[ -f "${DEPLOY_DIR:-}/brightness-api.py" ]]; then
  install -m 755 "$DEPLOY_DIR/brightness-api.py" /usr/local/bin/brightness-api.py
  if [[ -f "$DEPLOY_DIR/brightness-api.service" ]]; then
    install -m 644 "$DEPLOY_DIR/brightness-api.service" /etc/systemd/system/brightness-api.service
    systemctl daemon-reload
    systemctl enable brightness-api.service
    systemctl restart brightness-api.service
    echo "Installed and restarted brightness-api.service"
  fi
fi

# Overlay (crew manual control)
OVERLAY_USER="${SUDO_USER:-pi}"
OVERLAY_HOME=$(getent passwd "$OVERLAY_USER" 2>/dev/null | cut -d: -f6)
OVERLAY_HOME="${OVERLAY_HOME:-/home/pi}"
if [[ -f "${DEPLOY_DIR:-}/brightness-overlay.py" && -f "${DEPLOY_DIR:-}/brightness-overlay.desktop" ]] && [[ -d "$OVERLAY_HOME" ]]; then
  install -m 755 "$DEPLOY_DIR/brightness-overlay.py" "$OVERLAY_HOME/brightness-overlay.py"
  [[ -f "${DEPLOY_DIR:-}/brightness-overlay-launch.sh" ]] && install -m 755 "$DEPLOY_DIR/brightness-overlay-launch.sh" "$OVERLAY_HOME/brightness-overlay-launch.sh"
  mkdir -p "$OVERLAY_HOME/.config/autostart"
  sed "s|/home/pi|$OVERLAY_HOME|g" "$DEPLOY_DIR/brightness-overlay.desktop" > "$OVERLAY_HOME/.config/autostart/brightness-overlay.desktop"
  chown "$OVERLAY_USER:$OVERLAY_USER" "$OVERLAY_HOME/brightness-overlay.py" "$OVERLAY_HOME/.config/autostart/brightness-overlay.desktop"
  [[ -f "$OVERLAY_HOME/brightness-overlay-launch.sh" ]] && chown "$OVERLAY_USER:$OVERLAY_USER" "$OVERLAY_HOME/brightness-overlay-launch.sh"
  echo "Installed brightness overlay for $OVERLAY_USER (autostart; starts ~6s after login)"
fi

[[ "${DEPLOY_DIR:-}" == "/tmp/screen-brightness-deploy" ]] && rm -rf "$DEPLOY_DIR"

echo ""
systemctl status screen-brightness.service --no-pager || true