#!/bin/bash

# ============================================================================
# DYNAMIC DNS UPDATER FOR NAMECHEAP (MULTI-DOMAIN)
# ============================================================================
# Configuration - Edit these values
# ============================================================================

# Define your domains/hosts as an array of space-separated strings
# Format: "HOSTNAME:DOMAIN:PASSWORD"
# Use '@' for root domain, 'sub' for subdomain (e.g., 'home', 'video')
DOMAINS=(
  "home:seanowiecki.com:d7b38fc4de474e81a79a309824aa8e2a"
  "video:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "frigate:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "survey:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "memos:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "openwebui:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "immich:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "matrix:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "minecraft:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "chat:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "bentopdf:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "home:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "nextcloud:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "obico:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "obsidian:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "qr:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "cachet:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "grafana:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "valheim:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "satisfactory:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "vpn:atomic6.net:2a687057401f4401b4248d1d31b2ba81"
  "salt:nase.dev:1fa7b1a67d404b339e38107db98c87f0"
  "gitea:nase.dev:1fa7b1a67d404b339e38107db98c87f0"
)

# IP checking service (choose one that works reliably for you)
IP_SERVICE="https://api.ipify.org"  # Alternatives: "https://ifconfig.io/ip", "https://icanhazip.com"

# ============================================================================
# Script Core - Do not edit below unless you know what you're doing
# ============================================================================

# Get current public IP
echo "[$(date)] Checking public IP..."
CURRENT_IP=$(curl -s "$IP_SERVICE")

if [ -z "$CURRENT_IP" ]; then
  echo "[$(date)] ERROR: Could not fetch public IP. Check network or IP service."
  exit 1
fi

echo "[$(date)] Current public IP: $CURRENT_IP"

# Process each domain entry
for ENTRY in "${DOMAINS[@]}"; do
  # Split the entry into components
  IFS=":" read -r HOSTNAME DOMAIN PASSWORD <<< "$ENTRY"

  # Create a unique identifier for this host/domain combination
  RECORD_ID="${HOSTNAME}.${DOMAIN}"

  # File to store last IP for this specific record
  IP_FILE="/tmp/last_ip_${RECORD_ID//[^a-zA-Z0-9]/_}.txt"

  # Read last recorded IP if file exists
  if [ -f "$IP_FILE" ]; then
    LAST_IP=$(cat "$IP_FILE")
  else
    LAST_IP=""
  fi

  # Update only if IP has changed
  if [ "$CURRENT_IP" != "$LAST_IP" ]; then
    echo "[$(date)] IP changed for $RECORD_ID ($LAST_IP → $CURRENT_IP). Updating..."

    # Call Namecheap's API
    RESPONSE=$(curl -s "https://dynamicdns.park-your-domain.com/update?host=$HOSTNAME&domain=$DOMAIN&password=$PASSWORD&ip=$CURRENT_IP")

    # Check response for success
    if echo "$RESPONSE" | grep -q "<ErrCount>0</ErrCount>"; then
      echo "[$(date)] ✓ Successfully updated $RECORD_ID"
      echo "$CURRENT_IP" > "$IP_FILE"
    else
      # Extract error message from response
      ERROR=$(echo "$RESPONSE" | grep -o "<Err1>.*</Err1>" | sed 's/<Err1>\(.*\)<\/Err1>/\1/')
      echo "[$(date)] ✗ Failed to update $RECORD_ID: $ERROR"
    fi

    # Optional: Log full response for debugging
    # echo "API Response: $RESPONSE"
  else
    echo "[$(date)] IP unchanged for $RECORD_ID ($CURRENT_IP). Skipping."
  fi
done

echo "[$(date)] DDNS update cycle completed."