#!/usr/bin/env bash
#
# Uninstallation script for Porkbun Dynamic DNS systemd service
#
# This script will:
# 1. Stop and disable the timer
# 2. Remove service files from systemd
# 3. Reload systemd daemon

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 "Porkbun DDNS 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

# 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 "porkbun-ddns.timer"; then
    echo -e "${YELLOW}porkbun-ddns service is not installed${NC}"
    echo "Nothing to uninstall."
    exit 0
fi

# Confirm uninstallation
echo -e "${YELLOW}This will remove the porkbun-ddns systemd service.${NC}"
echo "Your DNS update 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 timer if running
echo "Stopping porkbun-ddns.timer..."
if systemctl is-active --quiet porkbun-ddns.timer; then
    sudo systemctl stop porkbun-ddns.timer
    echo -e "${GREEN}✓ Timer stopped${NC}"
else
    echo "Timer is not running"
fi
echo ""

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

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

# Remove service files
echo "Removing service files..."
REMOVED=0

if [ -f /etc/systemd/system/porkbun-ddns.service ]; then
    sudo rm /etc/systemd/system/porkbun-ddns.service
    echo -e "${GREEN}✓ Removed porkbun-ddns.service${NC}"
    ((REMOVED++))
fi

if [ -f /etc/systemd/system/porkbun-ddns.timer ]; then
    sudo rm /etc/systemd/system/porkbun-ddns.timer
    echo -e "${GREEN}✓ Removed porkbun-ddns.timer${NC}"
    ((REMOVED++))
fi

if [ $REMOVED -eq 0 ]; then
    echo -e "${YELLOW}No service files found to remove${NC}"
fi
echo ""

# Remove override directory if it exists
if [ -d /etc/systemd/system/porkbun-ddns.service.d ]; then
    sudo rm -rf /etc/systemd/system/porkbun-ddns.service.d
    echo -e "${GREEN}✓ Removed service override directory${NC}"
    echo ""
fi

# 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 porkbun-ddns.service 2>/dev/null || true
sudo systemctl reset-failed porkbun-ddns.timer 2>/dev/null || true

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

echo "======================================"
echo "Uninstallation Complete!"
echo "======================================"
echo ""
echo -e "${GREEN}The porkbun-ddns systemd service has been removed.${NC}"
echo ""
echo "Your files are still available:"
echo "  - updateDNS.sh (DNS update script)"
echo "  - .env (configuration)"
echo "  - porkbun-ddns.service (service template)"
echo "  - porkbun-ddns.timer (timer template)"
echo ""
echo "You can:"
echo "  - Reinstall with: ./install.sh"
echo "  - Run manually with: ./updateDNS.sh"
echo "  - Delete all files if no longer needed"