#!/usr/bin/env bash
#
# Installation script for Porkbun Dynamic DNS systemd service
#
# This script will:
# 1. Verify prerequisites
# 2. Copy service files to systemd directory
# 3. Enable and start the timer
# 4. Show status and usage information

set -euo pipefail

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

# Get script directory
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

echo "======================================"
echo "Porkbun DDNS Service Installer"
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

# Verify required files exist
echo "Checking required files..."
REQUIRED_FILES=(
    "$SCRIPT_DIR/updateDNS.sh"
    "$SCRIPT_DIR/.env"
    "$SCRIPT_DIR/porkbun-ddns.service"
    "$SCRIPT_DIR/porkbun-ddns.timer"
)

for file in "${REQUIRED_FILES[@]}"; do
    if [ ! -f "$file" ]; then
        echo -e "${RED}Error: Required file not found: $file${NC}"
        exit 1
    fi
done
echo -e "${GREEN}✓ All required files found${NC}"
echo ""

# Check if updateDNS.sh is executable
if [ ! -x "$SCRIPT_DIR/updateDNS.sh" ]; then
    echo "Making updateDNS.sh executable..."
    chmod +x "$SCRIPT_DIR/updateDNS.sh"
    echo -e "${GREEN}✓ Made updateDNS.sh executable${NC}"
fi

# Check for required commands
echo "Checking dependencies..."
MISSING_DEPS=()
for cmd in curl jq systemctl; do
    if ! command -v "$cmd" &> /dev/null; then
        MISSING_DEPS+=("$cmd")
    fi
done

if [ ${#MISSING_DEPS[@]} -gt 0 ]; then
    echo -e "${RED}Error: Missing required dependencies: ${MISSING_DEPS[*]}${NC}"
    echo "Please install them and try again."
    exit 1
fi
echo -e "${GREEN}✓ All dependencies installed${NC}"
echo ""

# Verify .env file has required variables
echo "Validating .env configuration..."
if ! grep -q "^API_KEY=" "$SCRIPT_DIR/.env" || \
   ! grep -q "^SECRET_KEY=" "$SCRIPT_DIR/.env" || \
   ! grep -q "^DOMAIN=" "$SCRIPT_DIR/.env" || \
   ! grep -q "^MACHINE_ID=" "$SCRIPT_DIR/.env"; then
    echo -e "${YELLOW}Warning: .env file may be incomplete${NC}"
    echo "Required variables: API_KEY, SECRET_KEY, DOMAIN, MACHINE_ID"
    echo ""
    read -p "Continue anyway? (y/N) " -n 1 -r
    echo ""
    if [[ ! $REPLY =~ ^[Yy]$ ]]; then
        exit 1
    fi
else
    echo -e "${GREEN}✓ .env configuration looks good${NC}"
fi
echo ""

# Test the script
echo "Testing DNS update script..."
if "$SCRIPT_DIR/updateDNS.sh"; then
    echo -e "${GREEN}✓ Script test passed${NC}"
else
    echo -e "${RED}Error: Script test failed${NC}"
    echo "Please fix the script configuration before installing the service."
    exit 1
fi
echo ""

# Check if service is already installed
if systemctl list-unit-files | grep -q "porkbun-ddns.timer"; then
    echo -e "${YELLOW}Warning: porkbun-ddns service is already installed${NC}"
    read -p "Reinstall? (y/N) " -n 1 -r
    echo ""
    if [[ ! $REPLY =~ ^[Yy]$ ]]; then
        exit 0
    fi
    echo "Stopping existing service..."
    sudo systemctl stop porkbun-ddns.timer 2>/dev/null || true
    sudo systemctl disable porkbun-ddns.timer 2>/dev/null || true
fi

# Create temporary service files with correct paths
echo "Preparing service files..."
TEMP_SERVICE=$(mktemp)
TEMP_TIMER=$(mktemp)

# Replace paths in service file
sed "s|/home/kacper/Documents/platformIO/email/porkbun|$SCRIPT_DIR|g" \
    "$SCRIPT_DIR/porkbun-ddns.service" > "$TEMP_SERVICE"

# Update user/group in service file
CURRENT_USER=$(whoami)
CURRENT_GROUP=$(id -gn)
sed -i "s|User=kacper|User=$CURRENT_USER|g" "$TEMP_SERVICE"
sed -i "s|Group=kacper|Group=$CURRENT_GROUP|g" "$TEMP_SERVICE"

# Copy timer file as-is
cp "$SCRIPT_DIR/porkbun-ddns.timer" "$TEMP_TIMER"

# Install service files
echo "Installing systemd service files..."
sudo cp "$TEMP_SERVICE" /etc/systemd/system/porkbun-ddns.service
sudo cp "$TEMP_TIMER" /etc/systemd/system/porkbun-ddns.timer

# Clean up temp files
rm "$TEMP_SERVICE" "$TEMP_TIMER"

# Set proper permissions
sudo chmod 644 /etc/systemd/system/porkbun-ddns.service
sudo chmod 644 /etc/systemd/system/porkbun-ddns.timer

echo -e "${GREEN}✓ Service files installed${NC}"
echo ""

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

# Enable and start timer
echo "Enabling and starting porkbun-ddns.timer..."
sudo systemctl enable porkbun-ddns.timer
sudo systemctl start porkbun-ddns.timer
echo -e "${GREEN}✓ Service enabled and started${NC}"
echo ""

# Show status
echo "======================================"
echo "Installation Complete!"
echo "======================================"
echo ""
echo "Service Status:"
sudo systemctl status porkbun-ddns.timer --no-pager -l || true
echo ""

echo -e "${GREEN}The Porkbun DDNS service is now running!${NC}"
echo ""
echo "Useful commands:"
echo "  View timer status:  systemctl status porkbun-ddns.timer"
echo "  View service logs:  journalctl -u porkbun-ddns.service -f"
echo "  List timers:        systemctl list-timers"
echo "  Run manually:       sudo systemctl start porkbun-ddns.service"
echo "  Stop service:       sudo systemctl stop porkbun-ddns.timer"
echo "  Uninstall:          ./uninstall.sh"
echo ""
echo "The service will update DNS records every 5 minutes."
echo "Check logs with: journalctl -u porkbun-ddns.service -n 50"