#!/usr/bin/env bash
#
# Uninstallation script for email_tunnel systemd service

set -euo pipefail

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

echo "======================================"
echo "email_tunnel Service Uninstaller"
echo "======================================"
echo ""

# Check if running as root
if [ "$EUID" -eq 0 ]; then
    echo -e "${RED}Error: Do not run this script as root or with sudo${NC}"
    echo "The script will request sudo privileges when needed."
    exit 1
fi

SERVICE_NAME="email_tunnel.service"

# Check if systemctl is available
if ! command -v systemctl &> /dev/null; then
    echo -e "${RED}Error: systemctl not found${NC}"
    echo "This script requires systemd."
    exit 1
fi

# Check if service is installed
if ! systemctl list-unit-files | grep -q "$SERVICE_NAME"; then
    echo -e "${YELLOW}$SERVICE_NAME is not installed${NC}"
    echo "Nothing to uninstall."
    exit 0
fi

# Confirm uninstallation
echo -e "${YELLOW}This will remove the $SERVICE_NAME systemd service.${NC}"
echo "Your script and configuration will NOT be deleted."
echo ""
read -p "Continue with uninstallation? (y/N) " -n 1 -r
echo ""
if [[ ! $REPLY =~ ^[Yy]$ ]]; then
    echo "Uninstallation cancelled."
    exit 0
fi
echo ""

# Stop the service if running
echo "Stopping $SERVICE_NAME..."
if systemctl is-active --quiet "$SERVICE_NAME"; then
    sudo systemctl stop "$SERVICE_NAME"
    echo -e "${GREEN}✓ Service stopped${NC}"
else
    echo "Service is not running"
fi
echo ""

# Disable the service
echo "Disabling $SERVICE_NAME..."
if systemctl is-enabled --quiet "$SERVICE_NAME"; then
    sudo systemctl disable "$SERVICE_NAME"
    echo -e "${GREEN}✓ Service disabled${NC}"
else
    echo "Service was not enabled"
fi
echo ""

# Remove service file
echo "Removing service file..."
if [ -f /etc/systemd/system/$SERVICE_NAME ]; then
    sudo rm /etc/systemd/system/$SERVICE_NAME
    echo -e "${GREEN}✓ Removed $SERVICE_NAME${NC}"
else
    echo -e "${YELLOW}No service file found to remove${NC}"
fi
echo ""

# Reload systemd
echo "Reloading systemd daemon..."
sudo systemctl daemon-reload
echo -e "${GREEN}✓ Systemd reloaded${NC}"
echo ""

# Reset failed state if exists
sudo systemctl reset-failed "$SERVICE_NAME" 2>/dev/null || true

# Verify uninstallation
echo "Verifying uninstallation..."
if systemctl list-unit-files | grep -q "email_tunnel"; then
    echo -e "${RED}Warning: Some email_tunnel units still found${NC}"
    systemctl list-unit-files | grep email_tunnel
else
    echo -e "${GREEN}✓ Service unit removed${NC}"
fi
echo ""

echo "======================================"
echo "Uninstallation Complete!"
echo "======================================"
echo ""
echo -e "${GREEN}The email_tunnel systemd service has been removed.${NC}"
echo ""
echo "Your files are still available:"
echo "  - email_tunnel.py (relay script)"
echo "  - .env (configuration)"
echo "  - email_tunnel.service (service template)"
echo ""
echo "You can reinstall with: ./install_email_tunnel.sh"