#!/bin/bash

# Fix QuickConnect 502 Error
# HTTP ERROR 502 - Bad Gateway

set -e

echo "=== Fix QuickConnect 502 Error ==="
echo ""
echo "502 Bad Gateway means QuickConnect relay server"
echo "can't reach your NAS or NAS is having issues."
echo ""

echo "🔍 Diagnosing..."
echo ""

# Check local network connectivity
echo "1. Checking local network connection..."
if ping -c 2 DS224plus.local &>/dev/null || ping -c 2 192.168.1.172 &>/dev/null; then
    echo "   ✅ NAS is reachable on local network"
    LOCAL_REACHABLE=true
else
    echo "   ❌ NAS not reachable on local network"
    LOCAL_REACHABLE=false
fi
echo ""

# Check SSH access
echo "2. Checking SSH access..."
if nas "uptime" &>/dev/null; then
    echo "   ✅ Can connect via SSH"
    SSH_WORKING=true
else
    echo "   ❌ Cannot connect via SSH"
    SSH_WORKING=false
fi
echo ""

# Check DSM web interface locally
echo "3. Checking DSM web interface (local)..."
HTTP_STATUS=$(curl -s -o /dev/null -w "%{http_code}" --connect-timeout 5 http://192.168.1.172:5000 2>/dev/null || echo "000")
if [ "$HTTP_STATUS" = "200" ] || [ "$HTTP_STATUS" = "302" ]; then
    echo "   ✅ DSM web interface working locally"
    WEB_WORKING=true
else
    echo "   ❌ DSM web interface not responding (HTTP $HTTP_STATUS)"
    WEB_WORKING=false
fi
echo ""

echo "=== Solutions ==="
echo ""

if [ "$LOCAL_REACHABLE" = true ] && [ "$WEB_WORKING" = true ]; then
    echo "✅ NAS is working locally!"
    echo ""
    echo "The 502 error is a QuickConnect issue, not your NAS."
    echo ""
    echo "Solution: Use local access instead:"
    echo ""
    echo "   http://192.168.1.172:5000"
    echo "   or"
    echo "   http://DS224plus.local:5000"
    echo ""
    echo "QuickConnect issues are usually:"
    echo "  - QuickConnect relay server problems (temporary)"
    echo "  - QuickConnect service disabled on NAS"
    echo "  - Network/firewall blocking QuickConnect"
    echo ""
elif [ "$LOCAL_REACHABLE" = true ] && [ "$SSH_WORKING" = true ]; then
    echo "✅ NAS is reachable via SSH"
    echo ""
    echo "DSM web interface may be down. Check:"
    echo ""
    echo "  1. NAS may be restarting or updating"
    echo "  2. Web service may be stopped"
    echo ""
    echo "Via SSH, check:"
    echo "  nas 'synoservice --status nginx'"
    echo "  nas 'synoservice --status httpd-user'"
    echo ""
else
    echo "⚠️  NAS may be down or unreachable"
    echo ""
    echo "Check:"
    echo "  1. Is NAS powered on? (Check power LED)"
    echo "  2. Is NAS connected to network? (Check network LED)"
    echo "  3. Try accessing directly: http://192.168.1.172:5000"
    echo ""
fi

echo ""
echo "=== QuickConnect 502 Error Fixes ==="
echo ""
echo "1. **Use Local Access Instead** (Recommended)"
echo "   http://192.168.1.172:5000"
echo "   This bypasses QuickConnect entirely"
echo ""
echo "2. **Check QuickConnect Settings**"
echo "   If you can access NAS locally:"
echo "   - Control Panel → External Access → QuickConnect"
echo "   - Make sure QuickConnect is enabled"
echo "   - Try disabling and re-enabling"
echo ""
echo "3. **Wait and Retry**"
echo "   QuickConnect 502 errors are often temporary"
echo "   Wait 5-10 minutes and try again"
echo ""
echo "4. **Check NAS Status**"
echo "   - Is NAS powered on?"
echo "   - Are status LEDs normal?"
echo "   - Try restarting NAS if needed"
echo ""