#!/bin/bash

# Diagnostic script to debug NodePort networking issues
# This helps identify why some URLs work and others don't

echo "🔍 NodePort Networking Diagnostics"
echo "=================================="
echo ""

# Check pod locations
echo "📍 Current Pod Locations:"
kubectl get pods -l app=nginx-nodeport -o wide
echo ""

# Check node information
echo "🌐 Node Information:"
kubectl get nodes -o wide
echo ""

# Check service status
echo "🔧 Service Status:"
kubectl get svc nginx-nodeport-service
echo ""

# Test connectivity to each node
echo "🧪 Connectivity Tests:"
echo ""

PODS=$(kubectl get pods -l app=nginx-nodeport -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.spec.nodeName}{"\n"}{end}')

while IFS=$'\t' read -r pod_name node_name; do
    echo "Testing pod: $pod_name on node: $node_name"
    
    # Get IPv6 for this specific node
    IPV6=$(kubectl get node "$node_name" -o jsonpath='{range .status.addresses[?(@.type=="InternalIP")]}{.address}{"\n"}{end}' | grep -E '^[0-9a-f]+:[0-9a-f]+:[0-9a-f]+:[0-9a-f]+:[0-9a-f]+:[0-9a-f]+:[0-9a-f]+:[0-9a-f]+$' | head -1)
    
    if [ ! -z "$IPV6" ]; then
        echo "  Node IPv6: $IPV6"
        echo "  Testing connectivity: curl -6 --connect-timeout 5 http://[$IPV6]:30091/health"
        
        # Test HTTP connectivity
        if curl -6 --connect-timeout 5 -s "http://[$IPV6]:30091/health" >/dev/null 2>&1; then
            echo "  ✅ HTTP connectivity: WORKING"
        else
            echo "  ❌ HTTP connectivity: FAILED"
        fi
        
        # Test ICMP connectivity
        echo "  Testing ping: ping -6 -c 2 -W 3 $IPV6"
        if ping -6 -c 2 -W 3 "$IPV6" >/dev/null 2>&1; then
            echo "  ✅ ICMP connectivity: WORKING"
        else
            echo "  ❌ ICMP connectivity: FAILED"
        fi
    else
        echo "  ❌ No IPv6 found for node: $node_name"
    fi
    echo ""
done <<< "$PODS"

echo "📊 Summary:"
echo "This shows which nodes actually have pods and whether they're accessible"
echo ""
echo "If some URLs work and others don't, it means:"
echo "  ✅ Working URLs: Nodes with good Mycelium connectivity"
echo "  ❌ Failed URLs: Nodes with poor Mycelium connectivity or network issues"
echo ""
echo "To fix connectivity issues:"
echo "  1. Check Mycelium status on affected nodes"
echo "  2. Restart Mycelium on nodes with failed connectivity"
echo "  3. Scale to replicas only on nodes with good connectivity"