#!/bin/sh
set -eu

APP_NAME="led-manager"
APP_DIR="/opt/led-manager"
CONFIG_DIR="/etc/led-manager"
CONFIG_FILE="$CONFIG_DIR/config.json"
PORT="${PORT:-8088}"
HOST="${HOST:-0.0.0.0}"
COLORS="${COLORS:-red,green,blue}"
RAW_BASE="${RAW_BASE:-https://gitea.chickliu.fun/Hermes/led-manager-panel/raw/branch/main}"

need_root() {
  if [ "$(id -u)" != "0" ]; then
    echo "请用 root 运行：su - 或 sudo sh install.sh" >&2
    exit 1
  fi
}

has_cmd() { command -v "$1" >/dev/null 2>&1; }

download() {
  url="$1"
  out="$2"
  if has_cmd curl; then
    curl -fsSL "$url" -o "$out"
  elif has_cmd wget; then
    wget -qO "$out" "$url"
  else
    echo "缺少 curl/wget，无法下载 $url" >&2
    exit 1
  fi
}

install_python_if_possible() {
  if has_cmd python3; then return 0; fi
  echo "未发现 python3，尝试安装..."
  if has_cmd apt-get; then
    apt-get update
    apt-get install -y python3 ca-certificates
  else
    echo "Debian 系统请先安装 python3：apt update && apt install -y python3" >&2
    exit 1
  fi
}

install_systemd_service() {
  if ! has_cmd systemctl; then
    echo "未发现 systemctl，已安装文件但不能配置开机启动。手动启动："
    echo "python3 $APP_DIR/led_panel.py --host $HOST --port $PORT --config $CONFIG_FILE"
    exit 0
  fi

  echo "安装 systemd 服务：$APP_NAME"
  download "$RAW_BASE/led-manager.service" "/etc/systemd/system/$APP_NAME.service"
  # Patch host/port/config/colors in service if env overrides were provided.
  sed -i "s#--host [^ ]* --port [0-9]* --config [^ ]*#--host $HOST --port $PORT --config $CONFIG_FILE --colors $COLORS#" "/etc/systemd/system/$APP_NAME.service" || true
  if ! grep -q -- '--colors' "/etc/systemd/system/$APP_NAME.service"; then
    sed -i "s#\(ExecStart=.*\)#\1 --colors $COLORS#" "/etc/systemd/system/$APP_NAME.service" || true
  fi
  systemctl daemon-reload
  systemctl enable "$APP_NAME"
  systemctl restart "$APP_NAME"
  systemctl is-active "$APP_NAME" >/dev/null 2>&1 && echo "服务已启动：$APP_NAME" || systemctl status "$APP_NAME" --no-pager || true
}

need_root
install_python_if_possible
mkdir -p "$APP_DIR" "$CONFIG_DIR"

# Preserve existing persistent config across reinstall/update.
if [ ! -f "$CONFIG_FILE" ]; then
  cat > "$CONFIG_FILE" <<'JSON'
{
  "version": 1,
  "leds": {}
}
JSON
fi
chmod 755 "$CONFIG_DIR" || true
chmod 644 "$CONFIG_FILE" || true

download "$RAW_BASE/led_panel.py" "$APP_DIR/led_panel.py"
chmod +x "$APP_DIR/led_panel.py"

# Debian-focused installer: always prefer systemd. OpenWrt is intentionally not handled here.
install_systemd_service

ipaddr="$(hostname -I 2>/dev/null | awk '{print $1}' || true)"
echo
echo "安装/更新完成。"
echo "服务：systemctl status $APP_NAME"
echo "配置：$CONFIG_FILE"
echo "访问地址： http://${ipaddr:-设备IP}:$PORT/"
echo "面板里点『保存持久化』后，重启系统会由 systemd 启动本项目并自动读取配置恢复 LED。"
echo "当前只显示/控制颜色：$COLORS"
echo "如需修改端口：PORT=8090 sh install.sh"
echo "如需显示全部 LED：COLORS= sh install.sh"