#!/bin/bash

# Enterprise CI/CD Foundation Cleanup Script
# This script removes the bootstrap S3 bucket and DynamoDB table
# Run this AFTER terraform destroy to completely clean up

set -e

echo "🧹 Foundation Layer Cleanup Script"

# Load configuration if available
if [ -f .backend-config ]; then
    echo "📋 Loading configuration from .backend-config..."
    source .backend-config
else
    echo "⚠️ No .backend-config found. Using environment variables..."
    BUCKET_NAME="${BUCKET_NAME:-}"
    TABLE_NAME="${TABLE_NAME:-}"
    AWS_REGION="${AWS_REGION:-us-east-1}"
    PROJECT_NAME="${PROJECT_NAME:-enterprise-cicd}"
    ENVIRONMENT="${ENVIRONMENT:-dev}"
fi

# Verify AWS credentials
echo "🔐 Verifying AWS credentials..."
aws sts get-caller-identity || {
    echo "❌ AWS credentials not configured or invalid"
    exit 1
}

# Interactive confirmation
echo ""
echo "⚠️  WARNING: This will permanently delete bootstrap resources!"
echo ""
echo "Resources to delete:"
echo "   S3 Bucket: ${BUCKET_NAME}"
echo "   DynamoDB Table: ${TABLE_NAME}"
echo "   Region: ${AWS_REGION}"
echo ""
read -p "Are you sure you want to proceed? (type 'DELETE' to confirm): " confirmation

if [ "$confirmation" != "DELETE" ]; then
    echo "❌ Cleanup cancelled"
    exit 1
fi

echo ""
echo "💀 Starting cleanup process..."

# Check if Terraform state still exists
if [ -f terraform.tfstate ] || [ -f .terraform/terraform.tfstate ]; then
    echo "❌ Error: Terraform state files still exist!"
    echo "Please run 'terraform destroy' first to destroy all infrastructure"
    echo "Then run this cleanup script to remove bootstrap resources"
    exit 1
fi

# Check if S3 bucket contains state files
if [ -n "${BUCKET_NAME}" ] && aws s3api head-bucket --bucket "${BUCKET_NAME}" 2>/dev/null; then
    STATE_FILES=$(aws s3 ls "s3://${BUCKET_NAME}/foundation/" --recursive 2>/dev/null || echo "")
    if [ -n "${STATE_FILES}" ]; then
        echo "❌ Error: S3 bucket contains Terraform state files!"
        echo "Found state files:"
        echo "${STATE_FILES}"
        echo ""
        echo "Please run 'terraform destroy' first to clean up all infrastructure"
        echo "This will remove the state files from S3"
        exit 1
    fi
fi

# Remove S3 bucket
if [ -n "${BUCKET_NAME}" ] && aws s3api head-bucket --bucket "${BUCKET_NAME}" 2>/dev/null; then
    echo "🗑️  Removing S3 bucket: ${BUCKET_NAME}"
    
    # Remove all objects and versions
    echo "   Removing all objects and versions..."
    aws s3api list-object-versions --bucket "${BUCKET_NAME}" \
        --query 'Versions[].[Key,VersionId]' --output text | \
        while read key version; do
            if [ -n "$key" ] && [ -n "$version" ]; then
                aws s3api delete-object --bucket "${BUCKET_NAME}" --key "$key" --version-id "$version"
            fi
        done
    
    # Remove delete markers
    aws s3api list-object-versions --bucket "${BUCKET_NAME}" \
        --query 'DeleteMarkers[].[Key,VersionId]' --output text | \
        while read key version; do
            if [ -n "$key" ] && [ -n "$version" ]; then
                aws s3api delete-object --bucket "${BUCKET_NAME}" --key "$key" --version-id "$version"
            fi
        done
    
    # Delete the bucket
    aws s3api delete-bucket --bucket "${BUCKET_NAME}" --region "${AWS_REGION}"
    echo "✅ S3 bucket ${BUCKET_NAME} deleted"
else
    echo "ℹ️  S3 bucket ${BUCKET_NAME} not found or already deleted"
fi

# Remove DynamoDB table
if [ -n "${TABLE_NAME}" ] && aws dynamodb describe-table --table-name "${TABLE_NAME}" --region "${AWS_REGION}" >/dev/null 2>&1; then
    echo "🗑️  Removing DynamoDB table: ${TABLE_NAME}"
    aws dynamodb delete-table --table-name "${TABLE_NAME}" --region "${AWS_REGION}"
    
    # Wait for deletion to complete
    echo "⏳ Waiting for table deletion to complete..."
    aws dynamodb wait table-not-exists --table-name "${TABLE_NAME}" --region "${AWS_REGION}"
    echo "✅ DynamoDB table ${TABLE_NAME} deleted"
else
    echo "ℹ️  DynamoDB table ${TABLE_NAME} not found or already deleted"
fi

# Clean up local files
echo "🧹 Cleaning up local files..."
rm -f backend.tf
rm -f .backend-config
rm -f terraform.tfstate.backup
rm -f .terraform.lock.hcl
rm -rf .terraform/

echo ""
echo "🎉 Cleanup completed successfully!"
echo ""
echo "📋 What was removed:"
echo "   ✅ S3 bucket: ${BUCKET_NAME}"
echo "   ✅ DynamoDB table: ${TABLE_NAME}"
echo "   ✅ Local backend configuration files"
echo ""
echo "💡 You can now run the bootstrap script again to create new resources"