#!/bin/bash
set -e

# Post-installation script
echo "Configuring Oculog client..."

# Create directories
mkdir -p /var/log/oculog
mkdir -p /etc/oculog

# Install Python dependencies using system-managed approach
# Try to install via apt first (for newer Ubuntu versions)
if apt-cache show python3-psutil >/dev/null 2>&1 && apt-cache show python3-requests >/dev/null 2>&1; then
    apt-get update -qq
    if apt-get install -y -qq python3-psutil python3-requests >/dev/null 2>&1; then
        PYTHON_BIN="/usr/bin/python3"
    else
        USE_VENV=1
    fi
else
    USE_VENV=1
fi

# If apt packages aren't available, use a virtual environment
if [ "$USE_VENV" = "1" ]; then
    apt-get update -qq
    apt-get install -y -qq python3-venv python3-pip >/dev/null 2>&1 || true
    
    # Create virtual environment
    python3 -m venv /opt/oculog/venv
    
    # Install packages in virtual environment
    /opt/oculog/venv/bin/pip install --quiet --upgrade pip
    /opt/oculog/venv/bin/pip install --quiet psutil==5.9.6 requests==2.31.0
    
    PYTHON_BIN="/opt/oculog/venv/bin/python3"
    
    # Update shebang in client script
    sed -i "1s|.*|#!${PYTHON_BIN}|" /opt/oculog/client.py
    
    # Update systemd service to use venv Python
    sed -i "s|ExecStart=.*|ExecStart=${PYTHON_BIN} /opt/oculog/client.py|" /etc/systemd/system/oculog-client.service
fi

# Enable and start service if config exists
if [ -f /etc/oculog/client.conf ]; then
    systemctl daemon-reload
    systemctl enable oculog-client.service 2>/dev/null || true
    systemctl start oculog-client.service 2>/dev/null || true
fi

echo "Oculog client installed successfully!"
echo "Please configure /etc/oculog/client.conf before starting the service."

exit 0