#!/bin/bash
# Kao Installation Script
# Installs to /opt/kao and sets up systemd service

set -e

INSTALL_DIR="/opt/kao"
SERVICE_FILE="/etc/systemd/system/kao.service"
CURRENT_USER=$(whoami)

echo "===================================="
echo "  Kao Installer"
echo "===================================="
echo "Install directory: $INSTALL_DIR"
echo "Running as user: $CURRENT_USER"
echo ""

# Check if running with appropriate permissions
if [ ! -w "/opt" ]; then
    echo "Error: Need write access to /opt"
    echo "Run with: sudo $0"
    exit 1
fi

# Create install directory
echo "[1/5] Creating install directory..."
mkdir -p "$INSTALL_DIR"
cp -r aggregator.py kao.py index.html config.json requirements.txt detectors "$INSTALL_DIR/"
chown -R "$CURRENT_USER:$CURRENT_USER" "$INSTALL_DIR"

# Create virtual environment
echo "[2/5] Creating virtual environment..."
cd "$INSTALL_DIR"
python3 -m venv venv
./venv/bin/pip install --upgrade pip -q
./venv/bin/pip install -r requirements.txt -q

# Create systemd service
echo "[3/5] Creating systemd service..."
cat > "$SERVICE_FILE" << EOF
[Unit]
Description=Kao - System Status Monitor
After=network.target

[Service]
Type=simple
User=$CURRENT_USER
WorkingDirectory=$INSTALL_DIR
ExecStart=$INSTALL_DIR/venv/bin/python $INSTALL_DIR/kao.py
Restart=always
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

# Reload systemd and enable service
echo "[4/5] Enabling service..."
systemctl daemon-reload
systemctl enable kao.service

# Start service
echo "[5/5] Starting Kao..."
systemctl start kao.service

echo ""
echo "===================================="
echo "  Installation complete!"
echo "===================================="
echo ""
echo "Kao is now running at http://$(hostname -I | awk '{print $1}'):5000"
echo ""
echo "Commands:"
echo "  sudo systemctl status kao    # Check status"
echo "  sudo systemctl restart kao   # Restart"
echo "  sudo systemctl stop kao      # Stop"
echo "  sudo journalctl -u kao -f    # View logs"
echo ""
echo "Config file: $INSTALL_DIR/config.json"