#!/bin/bash

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

# Script to help migrate projects to unified API gateway

set -e

PROJECT_NAME="${1:-}"
SERVICE_URL="${2:-}"

if [ -z "$PROJECT_NAME" ] || [ -z "$SERVICE_URL" ]; then
  echo "🚪 API Gateway Migration Helper"
  echo ""
  echo "Usage: $0 <project-name> <service-url>"
  echo ""
  echo "Example: $0 my-service http://my-service:8080"
  echo ""
  echo "This script helps migrate a project to use the unified API gateway."
  exit 1
fi

echo "🚪 Migrating $PROJECT_NAME to unified API gateway..."

# Create Kong service configuration
cat > "/tmp/${PROJECT_NAME}-kong-service.yaml" << EOF
apiVersion: configuration.konghq.com/v1
kind: KongService
metadata:
  name: ${PROJECT_NAME}
  namespace: api-gateway
spec:
  url: ${SERVICE_URL}
  protocol: http
  port: 80
  path: /
  connect_timeout: 60000
  write_timeout: 60000
  read_timeout: 60000
EOF

# Create Kong route configuration
cat > "/tmp/${PROJECT_NAME}-kong-route.yaml" << EOF
apiVersion: configuration.konghq.com/v1
kind: KongRoute
metadata:
  name: ${PROJECT_NAME}-route
  namespace: api-gateway
spec:
  service: ${PROJECT_NAME}
  paths:
    - /api/${PROJECT_NAME}
  methods:
    - GET
    - POST
    - PUT
    - DELETE
  strip_path: false
  preserve_host: true
EOF

# Create Kong plugin for rate limiting
cat > "/tmp/${PROJECT_NAME}-kong-plugin.yaml" << EOF
apiVersion: configuration.konghq.com/v1
kind: KongPlugin
metadata:
  name: ${PROJECT_NAME}-rate-limit
  namespace: api-gateway
plugin: rate-limiting
config:
  minute: 100
  hour: 1000
  policy: local
  fault_tolerant: true
  hide_client_headers: false
EOF

# Create Kong plugin for CORS
cat > "/tmp/${PROJECT_NAME}-kong-cors.yaml" << EOF
apiVersion: configuration.konghq.com/v1
kind: KongPlugin
metadata:
  name: ${PROJECT_NAME}-cors
  namespace: api-gateway
plugin: cors
config:
  origins:
    - "*"
  methods:
    - GET
    - POST
    - PUT
    - DELETE
    - OPTIONS
  headers:
    - Accept
    - Authorization
    - Content-Type
  exposed_headers:
    - X-Auth-Token
  credentials: true
  max_age: 3600
EOF

echo "✅ Created Kong configuration templates:"
echo "   - /tmp/${PROJECT_NAME}-kong-service.yaml"
echo "   - /tmp/${PROJECT_NAME}-kong-route.yaml"
echo "   - /tmp/${PROJECT_NAME}-kong-plugin.yaml"
echo "   - /tmp/${PROJECT_NAME}-kong-cors.yaml"
echo ""
echo "📝 Next steps:"
echo "   1. Review and customize configurations"
echo "   2. Update service URL if needed"
echo "   3. Apply Kong resources:"
echo "      kubectl apply -f /tmp/${PROJECT_NAME}-kong-*.yaml"
echo ""
echo "📖 See docs/API_GATEWAY_MIGRATION_GUIDE.md for detailed instructions"