#!/bin/bash
set -euo pipefail

# QR Server Installation Script
# Run as root or with sudo

BINARY_NAME="server18004"
INSTALL_DIR="/usr/local/bin"
CONFIG_DIR="/etc/server18004"
SERVICE_USER="qrserver"
SERVICE_FILE="/etc/systemd/system/server18004.service"

echo "=== server18004 Installer ==="

# 1. Build release binary
echo "[1/5] Building release binary..."
if command -v cargo &>/dev/null; then
    cargo build --release
    echo "  ✓ Built target/release/${BINARY_NAME}"
elif [ -f "target/release/${BINARY_NAME}" ]; then
    echo "  ✓ Found existing binary in target/release/${BINARY_NAME}, skipping build"
else
    echo "  ✗ Error: 'cargo' not found and no existing binary in target/release/"
    echo "    Please run 'cargo build --release' as your normal user first,"
    echo "    then run this script with sudo."
    exit 1
fi

# 2. Create service user
echo "[2/5] Creating service user..."
if ! id -u "${SERVICE_USER}" &>/dev/null; then
    useradd --system --no-create-home --shell /usr/sbin/nologin "${SERVICE_USER}"
    echo "  ✓ Created user ${SERVICE_USER}"
else
    echo "  ✓ User ${SERVICE_USER} already exists"
fi

# 3. Install binary
echo "[3/5] Installing binary..."
cp "target/release/${BINARY_NAME}" "${INSTALL_DIR}/${BINARY_NAME}"
chmod 755 "${INSTALL_DIR}/${BINARY_NAME}"
echo "  ✓ Installed to ${INSTALL_DIR}/${BINARY_NAME}"

# 4. Install config files
echo "[4/5] Installing configuration..."
mkdir -p "${CONFIG_DIR}"
if [ ! -f "${CONFIG_DIR}/server.conf" ]; then
    cp config/server.conf.example "${CONFIG_DIR}/server.conf"
    echo "  ✓ Installed server.conf"
else
    echo "  ⚠ server.conf already exists, skipping (see config/server.conf.example)"
fi
if [ ! -f "${CONFIG_DIR}/domains.conf" ]; then
    cp config/domains.conf.example "${CONFIG_DIR}/domains.conf"
    echo "  ✓ Installed domains.conf"
else
    echo "  ⚠ domains.conf already exists, skipping (see config/domains.conf.example)"
fi
chown -R "${SERVICE_USER}:${SERVICE_USER}" "${CONFIG_DIR}"
echo "  ✓ Set ownership to ${SERVICE_USER}"

# 5. Install systemd service
echo "[5/5] Installing systemd service..."
cp config/server18004.service "${SERVICE_FILE}"
systemctl daemon-reload
echo "  ✓ Service installed"

echo ""
echo "=== Installation Complete ==="
echo ""
echo "Next steps:"
echo "  1. Edit config:    sudo nano ${CONFIG_DIR}/server.conf"
echo "  2. Edit domains:   sudo nano ${CONFIG_DIR}/domains.conf"
echo "  3. Start service:  sudo systemctl start server18004"
echo "  4. Enable on boot: sudo systemctl enable server18004"
echo "  5. Check status:   sudo systemctl status server18004"
echo "  6. View logs:      sudo journalctl -u server18004 -f"