#!/bin/bash

# Agent Manager - Systemd Service Uninstallation Script
# This script removes the agent-manager systemd service

set -e  # Exit on error

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color

# Print functions
print_info() {
    echo -e "${GREEN}[INFO]${NC} $1"
}

print_warning() {
    echo -e "${YELLOW}[WARNING]${NC} $1"
}

print_error() {
    echo -e "${RED}[ERROR]${NC} $1"
}

# Check if running as root
if [ "$EUID" -eq 0 ]; then
    print_error "Please do not run this script as root or with sudo"
    print_info "The script will prompt for sudo password when needed"
    exit 1
fi

# Check if systemd is available
if ! command -v systemctl &> /dev/null; then
    print_error "systemd is not available on this system"
    exit 1
fi

# Check if service file exists
if [ ! -f /etc/systemd/system/agent-manager.service ]; then
    print_warning "Service file not found: /etc/systemd/system/agent-manager.service"
    print_info "The service may not be installed, or it was already removed"
    exit 0
fi

print_warning "This will remove the agent-manager systemd service"
echo "The following actions will be performed:"
echo "  1. Stop the agent-manager service"
echo "  2. Disable the agent-manager service"
echo "  3. Remove the service file from /etc/systemd/system/"
echo "  4. Reload systemd daemon"
echo ""
print_info "Note: This will NOT remove:"
echo "  - The project directory and files"
echo "  - Configuration files (.env, commands.json)"
echo "  - Queue data (queue.json)"
echo "  - Log file (/var/log/agent-manager.log)"
echo ""

# Confirm uninstallation
read -p "Do you want to proceed with the uninstallation? (y/N): " -n 1 -r
echo
if [[ ! $REPLY =~ ^[Yy]$ ]]; then
    print_warning "Uninstallation cancelled"
    exit 0
fi

# Check if service is running
if sudo systemctl is-active --quiet agent-manager; then
    print_info "Stopping agent-manager service..."
    sudo systemctl stop agent-manager
    print_info "✓ Service stopped"
else
    print_info "Service is not running"
fi

# Check if service is enabled
if sudo systemctl is-enabled --quiet agent-manager 2>/dev/null; then
    print_info "Disabling agent-manager service..."
    sudo systemctl disable agent-manager
    print_info "✓ Service disabled"
else
    print_info "Service is not enabled"
fi

# Remove the service file
print_info "Removing service file..."
sudo rm -f /etc/systemd/system/agent-manager.service
print_info "✓ Service file removed"

# Reload systemd
print_info "Reloading systemd daemon..."
sudo systemctl daemon-reload

# Reset failed state if any
sudo systemctl reset-failed agent-manager 2>/dev/null || true

echo ""
print_info "✓ Uninstallation complete!"
echo ""
print_info "The project files remain in place. If you want to remove them:"
echo "  - Configuration: .env, commands.json"
echo "  - Queue data: queue.json"
echo "  - Log file: /var/log/agent-manager.log (remove with: sudo rm /var/log/agent-manager.log)"
echo "  - Project directory: $PWD"
echo ""
print_info "To reinstall the service, run: ./install.sh"