#!/usr/bin/env bash

set -e

# Region failover script for multi-region deployment

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "$SCRIPT_DIR/../lib/init.sh"
PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"

PRIMARY_REGION="${PRIMARY_REGION:-eastus}"
SECONDARY_REGION="${SECONDARY_REGION:-westus}"

echo "Region Failover Script"
echo "======================"
echo "Primary Region: $PRIMARY_REGION"
echo "Secondary Region: $SECONDARY_REGION"

# Check primary region health
check_region_health() {
    local region=$1
    echo "Checking health of region: $region"
    
    # Check AKS cluster status
    az aks show --resource-group "defi-oracle-mainnet-${region}-rg" \
        --name "defi-oracle-aks-${region}" \
        --query "powerState.code" -o tsv
    
    # Check node status
    kubectl get nodes --context "defi-oracle-aks-${region}"
    
    # Check pod status
    kubectl get pods -n besu-network --context "defi-oracle-aks-${region}"
}

# Failover to secondary region
failover_to_secondary() {
    echo "Initiating failover to secondary region: $SECONDARY_REGION"
    
    # Scale up secondary region
    echo "Scaling up secondary region..."
    az aks scale --resource-group "defi-oracle-mainnet-${SECONDARY_REGION}-rg" \
        --name "defi-oracle-aks-${SECONDARY_REGION}" \
        --node-count 5
    
    # Update DNS/load balancer to point to secondary
    echo "Updating DNS to point to secondary region..."
    # Add DNS update logic here
    
    # Verify secondary region is operational
    echo "Verifying secondary region..."
    check_region_health "$SECONDARY_REGION"
    
    echo "Failover complete!"
}

# Main
if [ "$1" == "check" ]; then
    check_region_health "$PRIMARY_REGION"
    check_region_health "$SECONDARY_REGION"
elif [ "$1" == "failover" ]; then
    failover_to_secondary
else
    echo "Usage: $0 [check|failover]"
    exit 1
fi