import boto3
import json
import logging
import asyncio
from datetime import datetime, timedelta
from typing import Dict, List, Optional, Any
from dataclasses import dataclass, asdict
from enum import Enum
import hashlib
import time

class RecoveryTestType(Enum):
    FULL_RESTORE = "full_restore"
    PARTIAL_RESTORE = "partial_restore"
    POINT_IN_TIME = "point_in_time"
    CROSS_REGION = "cross_region"
    DISASTER_RECOVERY = "disaster_recovery"

class TestStatus(Enum):
    SCHEDULED = "scheduled"
    RUNNING = "running"
    COMPLETED = "completed"
    FAILED = "failed"
    CANCELLED = "cancelled"

@dataclass
class RecoveryTest:
    test_id: str
    test_name: str
    test_type: RecoveryTestType
    backup_arn: str
    target_environment: str
    test_schedule: str
    expected_rto_minutes: int
    expected_rpo_minutes: int
    validation_criteria: List[Dict[str, Any]]
    cleanup_required: bool
    created_at: datetime

@dataclass
class RecoveryTestExecution:
    execution_id: str
    test_id: str
    status: TestStatus
    started_at: datetime
    completed_at: Optional[datetime]
    recovery_start_time: Optional[datetime]
    recovery_end_time: Optional[datetime]
    actual_rto_minutes: Optional[float]
    actual_rpo_minutes: Optional[float]
    validation_results: List[Dict[str, Any]]
    error_message: Optional[str]
    restored_resources: List[str]

class BackupRecoveryTestManager:
    """Comprehensive backup recovery testing and validation system"""
    
    def __init__(self, config: Dict[str, Any]):
        self.config = config
        
        # AWS clients
        self.backup = boto3.client('backup')
        self.s3 = boto3.client('s3')
        self.rds = boto3.client('rds')
        self.ec2 = boto3.client('ec2')
        self.dynamodb_client = boto3.client('dynamodb')
        self.dynamodb = boto3.resource('dynamodb')
        self.lambda_client = boto3.client('lambda')
        self.cloudwatch = boto3.client('cloudwatch')
        self.sns = boto3.client('sns')
        
        # Storage
        self.tests_table = self.dynamodb.Table(config.get('tests_table', 'recovery-tests'))
        self.executions_table = self.dynamodb.Table(config.get('executions_table', 'recovery-test-executions'))
        
        # Configuration
        self.test_environment_prefix = config.get('test_environment_prefix', 'recovery-test')
        self.notification_topic_arn = config.get('notification_topic_arn')
        
        # Active tests
        self.active_tests = {}
        
    async def create_recovery_test_suite(self, test_configs: List[Dict[str, Any]]) -> List[str]:
        """Create comprehensive recovery test suite"""
        try:
            created_tests = []
            
            for test_config in test_configs:
                test = RecoveryTest(
                    test_id=f"test_{int(datetime.utcnow().timestamp())}_{test_config['test_name'].replace(' ', '_').lower()}",
                    test_name=test_config['test_name'],
                    test_type=RecoveryTestType(test_config['test_type']),
                    backup_arn=test_config['backup_arn'],
                    target_environment=test_config.get('target_environment', 'test'),
                    test_schedule=test_config.get('test_schedule', 'weekly'),
                    expected_rto_minutes=test_config.get('expected_rto_minutes', 60),
                    expected_rpo_minutes=test_config.get('expected_rpo_minutes', 60),
                    validation_criteria=test_config.get('validation_criteria', []),
                    cleanup_required=test_config.get('cleanup_required', True),
                    created_at=datetime.utcnow()
                )
                
                # Store test
                await self._store_recovery_test(test)
                
                # Schedule test execution
                await self._schedule_recovery_test(test)
                
                created_tests.append(test.test_id)
                self.active_tests[test.test_id] = test
                
                logging.info(f"Created recovery test: {test.test_name}")
            
            return created_tests
            
        except Exception as e:
            logging.error(f"Failed to create recovery test suite: {str(e)}")
            return []
    
    async def execute_recovery_test(self, test_id: str) -> str:
        """Execute recovery test"""
        try:
            test = self.active_tests.get(test_id)
            if not test:
                raise ValueError(f"Recovery test {test_id} not found")
            
            # Create execution record
            execution_id = f"exec_{int(datetime.utcnow().timestamp())}_{test_id}"
            
            execution = RecoveryTestExecution(
                execution_id=execution_id,
                test_id=test_id,
                status=TestStatus.RUNNING,
                started_at=datetime.utcnow(),
                completed_at=None,
                recovery_start_time=None,
                recovery_end_time=None,
                actual_rto_minutes=None,
                actual_rpo_minutes=None,
                validation_results=[],
                error_message=None,
                restored_resources=[]
            )
            
            # Store execution
            await self._store_test_execution(execution)
            
            # Start test execution
            asyncio.create_task(self._execute_recovery_test_phases(test, execution))
            
            logging.info(f"Started recovery test execution: {execution_id}")
            return execution_id
            
        except Exception as e:
            logging.error(f"Failed to execute recovery test: {str(e)}")
            raise
    
    async def _execute_recovery_test_phases(self, test: RecoveryTest, execution: RecoveryTestExecution):
        """Execute all phases of recovery test"""
        try:
            # Phase 1: Pre-test validation
            await self._validate_backup_integrity(test, execution)
            
            # Phase 2: Environment preparation
            await self._prepare_test_environment(test, execution)
            
            # Phase 3: Recovery execution
            execution.recovery_start_time = datetime.utcnow()
            await self._execute_recovery_operation(test, execution)
            execution.recovery_end_time = datetime.utcnow()
            
            # Calculate actual RTO
            if execution.recovery_start_time and execution.recovery_end_time:
                execution.actual_rto_minutes = (execution.recovery_end_time - execution.recovery_start_time).total_seconds() / 60
            
            # Phase 4: Validation
            await self._validate_recovery_results(test, execution)
            
            # Phase 5: Cleanup
            if test.cleanup_required:
                await self._cleanup_test_environment(test, execution)
            
            # Complete execution
            execution.status = TestStatus.COMPLETED
            execution.completed_at = datetime.utcnow()
            
            # Send notification
            await self._send_test_notification(test, execution)
            
        except Exception as e:
            logging.error(f"Recovery test execution failed: {str(e)}")
            execution.status = TestStatus.FAILED
            execution.error_message = str(e)
            execution.completed_at = datetime.utcnow()
            
            # Send failure notification
            await self._send_test_notification(test, execution)
        
        finally:
            # Store final execution state
            await self._store_test_execution(execution)
    
    async def _validate_backup_integrity(self, test: RecoveryTest, execution: RecoveryTestExecution):
        """Validate backup integrity before recovery"""
        try:
            # Get backup details
            backup_details = await self._get_backup_details(test.backup_arn)
            
            validation_result = {
                'validation_type': 'backup_integrity',
                'timestamp': datetime.utcnow().isoformat(),
                'passed': True,
                'details': {}
            }
            
            # Check backup status
            if backup_details.get('Status') != 'COMPLETED':
                validation_result['passed'] = False
                validation_result['details']['status_issue'] = f"Backup status is {backup_details.get('Status')}"
            
            # Check backup size
            backup_size = backup_details.get('BackupSizeInBytes', 0)
            if backup_size == 0:
                validation_result['passed'] = False
                validation_result['details']['size_issue'] = "Backup size is zero"
            
            # Check encryption
            if not backup_details.get('EncryptionKeyArn'):
                validation_result['passed'] = False
                validation_result['details']['encryption_issue'] = "Backup is not encrypted"
            
            execution.validation_results.append(validation_result)
            
            if not validation_result['passed']:
                raise Exception(f"Backup integrity validation failed: {validation_result['details']}")
            
            logging.info("Backup integrity validation passed")
            
        except Exception as e:
            logging.error(f"Backup integrity validation failed: {str(e)}")
            raise
    
    async def _prepare_test_environment(self, test: RecoveryTest, execution: RecoveryTestExecution):
        """Prepare test environment for recovery"""
        try:
            # Create test environment resources based on test type
            if test.test_type == RecoveryTestType.FULL_RESTORE:
                await self._prepare_full_restore_environment(test, execution)
            elif test.test_type == RecoveryTestType.CROSS_REGION:
                await self._prepare_cross_region_environment(test, execution)
            elif test.test_type == RecoveryTestType.DISASTER_RECOVERY:
                await self._prepare_disaster_recovery_environment(test, execution)
            
            logging.info("Test environment prepared successfully")
            
        except Exception as e:
            logging.error(f"Failed to prepare test environment: {str(e)}")
            raise
    
    async def _execute_recovery_operation(self, test: RecoveryTest, execution: RecoveryTestExecution):
        """Execute the actual recovery operation"""
        try:
            # Start restore job
            restore_response = self.backup.start_restore_job(
                RecoveryPointArn=test.backup_arn,
                Metadata=self._get_restore_metadata(test),
                IamRoleArn=self.config.get('restore_service_role_arn'),
                ResourceType=self._get_resource_type_from_arn(test.backup_arn)
            )
            
            restore_job_id = restore_response['RestoreJobId']
            
            # Monitor restore job
            while True:
                restore_status = self.backup.describe_restore_job(RestoreJobId=restore_job_id)
                
                status = restore_status['Status']
                
                if status == 'COMPLETED':
                    execution.restored_resources.append(restore_status.get('CreatedResourceArn', ''))
                    break
                elif status in ['FAILED', 'ABORTED']:
                    raise Exception(f"Restore job failed: {restore_status.get('StatusMessage', 'Unknown error')}")
                
                # Wait before checking again
                await asyncio.sleep(30)
            
            logging.info(f"Recovery operation completed: {restore_job_id}")
            
        except Exception as e:
            logging.error(f"Recovery operation failed: {str(e)}")
            raise
    
    async def _validate_recovery_results(self, test: RecoveryTest, execution: RecoveryTestExecution):
        """Validate recovery results against criteria"""
        try:
            for criteria in test.validation_criteria:
                validation_result = await self._execute_validation_criteria(criteria, execution)
                execution.validation_results.append(validation_result)
                
                if not validation_result['passed']:
                    logging.warning(f"Validation criteria failed: {criteria['name']}")
            
            # Validate RTO/RPO objectives
            rto_validation = {
                'validation_type': 'rto_check',
                'timestamp': datetime.utcnow().isoformat(),
                'passed': execution.actual_rto_minutes <= test.expected_rto_minutes if execution.actual_rto_minutes else False,
                'details': {
                    'expected_rto_minutes': test.expected_rto_minutes,
                    'actual_rto_minutes': execution.actual_rto_minutes
                }
            }
            execution.validation_results.append(rto_validation)
            
            logging.info("Recovery results validation completed")
            
        except Exception as e:
            logging.error(f"Recovery results validation failed: {str(e)}")
            raise
    
    async def _execute_validation_criteria(self, criteria: Dict[str, Any], 
                                         execution: RecoveryTestExecution) -> Dict[str, Any]:
        """Execute specific validation criteria"""
        try:
            validation_result = {
                'validation_type': criteria['type'],
                'name': criteria['name'],
                'timestamp': datetime.utcnow().isoformat(),
                'passed': False,
                'details': {}
            }
            
            if criteria['type'] == 'data_integrity':
                # Validate data integrity
                validation_result['passed'] = await self._validate_data_integrity(
                    execution.restored_resources[0], criteria
                )
            elif criteria['type'] == 'connectivity':
                # Validate connectivity
                validation_result['passed'] = await self._validate_connectivity(
                    execution.restored_resources[0], criteria
                )
            elif criteria['type'] == 'performance':
                # Validate performance
                validation_result['passed'] = await self._validate_performance(
                    execution.restored_resources[0], criteria
                )
            
            return validation_result
            
        except Exception as e:
            logging.error(f"Validation criteria execution failed: {str(e)}")
            return {
                'validation_type': criteria['type'],
                'name': criteria['name'],
                'timestamp': datetime.utcnow().isoformat(),
                'passed': False,
                'details': {'error': str(e)}
            }
    
    async def _validate_data_integrity(self, resource_arn: str, criteria: Dict[str, Any]) -> bool:
        """Validate data integrity of restored resource"""
        try:
            # This would implement specific data integrity checks
            # For example, checksum validation, record counts, etc.
            
            # Simplified validation - in practice, this would be more comprehensive
            return True
            
        except Exception as e:
            logging.error(f"Data integrity validation failed: {str(e)}")
            return False
    
    async def _validate_connectivity(self, resource_arn: str, criteria: Dict[str, Any]) -> bool:
        """Validate connectivity to restored resource"""
        try:
            # This would implement connectivity tests
            # For example, database connections, API endpoints, etc.
            
            # Simplified validation
            return True
            
        except Exception as e:
            logging.error(f"Connectivity validation failed: {str(e)}")
            return False
    
    async def _validate_performance(self, resource_arn: str, criteria: Dict[str, Any]) -> bool:
        """Validate performance of restored resource"""
        try:
            # This would implement performance tests
            # For example, query response times, throughput tests, etc.
            
            # Simplified validation
            return True
            
        except Exception as e:
            logging.error(f"Performance validation failed: {str(e)}")
            return False
    
    async def _cleanup_test_environment(self, test: RecoveryTest, execution: RecoveryTestExecution):
        """Clean up test environment resources"""
        try:
            for resource_arn in execution.restored_resources:
                await self._delete_test_resource(resource_arn)
            
            logging.info("Test environment cleanup completed")
            
        except Exception as e:
            logging.error(f"Test environment cleanup failed: {str(e)}")
    
    async def _delete_test_resource(self, resource_arn: str):
        """Delete specific test resource"""
        try:
            # Determine resource type and delete accordingly
            if 'rds' in resource_arn:
                # Delete RDS instance
                db_identifier = resource_arn.split(':')[-1]
                self.rds.delete_db_instance(
                    DBInstanceIdentifier=db_identifier,
                    SkipFinalSnapshot=True
                )
            elif 'ec2' in resource_arn:
                # Terminate EC2 instance
                instance_id = resource_arn.split('/')[-1]
                self.ec2.terminate_instances(InstanceIds=[instance_id])
            
            logging.info(f"Deleted test resource: {resource_arn}")
            
        except Exception as e:
            logging.error(f"Failed to delete test resource {resource_arn}: {str(e)}")
    
    def _get_restore_metadata(self, test: RecoveryTest) -> Dict[str, str]:
        """Get restore metadata based on test configuration"""
        metadata = {}
        
        # Add test-specific metadata
        if test.test_type == RecoveryTestType.CROSS_REGION:
            metadata['TargetRegion'] = 'us-west-2'  # Example
        
        # Add test environment prefix
        metadata['Environment'] = test.target_environment
        metadata['TestId'] = test.test_id
        
        return metadata
    
    def _get_resource_type_from_arn(self, backup_arn: str) -> str:
        """Extract resource type from backup ARN"""
        # Simplified extraction - in practice, this would be more robust
        if 'rds' in backup_arn:
            return 'RDS'
        elif 'ec2' in backup_arn:
            return 'EC2'
        elif 'dynamodb' in backup_arn:
            return 'DynamoDB'
        else:
            return 'Unknown'
    
    async def _get_backup_details(self, backup_arn: str) -> Dict[str, Any]:
        """Get backup details from AWS Backup"""
        try:
            # Extract vault name and recovery point ARN from backup ARN
            vault_name = backup_arn.split('/')[-2]
            
            response = self.backup.describe_recovery_point(
                BackupVaultName=vault_name,
                RecoveryPointArn=backup_arn
            )
            
            return response
            
        except Exception as e:
            logging.error(f"Failed to get backup details: {str(e)}")
            return {}
    
    async def generate_recovery_test_report(self) -> Dict[str, Any]:
        """Generate comprehensive recovery test report"""
        try:
            # Get all tests and recent executions
            all_tests = list(self.active_tests.values())
            recent_executions = await self._get_recent_test_executions(days=30)
            
            # Calculate statistics
            total_tests = len(all_tests)
            successful_tests = len([e for e in recent_executions if e.status == TestStatus.COMPLETED])
            failed_tests = len([e for e in recent_executions if e.status == TestStatus.FAILED])
            
            # Calculate average RTO
            completed_executions = [e for e in recent_executions if e.actual_rto_minutes]
            avg_rto = sum([e.actual_rto_minutes for e in completed_executions]) / len(completed_executions) if completed_executions else 0
            
            report = {
                'report_timestamp': datetime.utcnow().isoformat(),
                'summary': {
                    'total_recovery_tests': total_tests,
                    'successful_tests_30d': successful_tests,
                    'failed_tests_30d': failed_tests,
                    'success_rate': (successful_tests / (successful_tests + failed_tests) * 100) if (successful_tests + failed_tests) > 0 else 0,
                    'average_rto_minutes': avg_rto
                },
                'test_details': [
                    {
                        'test_id': test.test_id,
                        'test_name': test.test_name,
                        'test_type': test.test_type.value,
                        'expected_rto_minutes': test.expected_rto_minutes,
                        'last_execution': 'N/A'  # Would be populated from recent executions
                    }
                    for test in all_tests
                ],
                'recent_executions': [
                    {
                        'execution_id': exec.execution_id,
                        'test_name': next((t.test_name for t in all_tests if t.test_id == exec.test_id), 'Unknown'),
                        'status': exec.status.value,
                        'actual_rto_minutes': exec.actual_rto_minutes,
                        'validation_passed': all([v.get('passed', False) for v in exec.validation_results])
                    }
                    for exec in recent_executions
                ]
            }
            
            return report
            
        except Exception as e:
            logging.error(f"Failed to generate recovery test report: {str(e)}")
            return {'error': str(e)}
    
    async def _get_recent_test_executions(self, days: int = 30) -> List[RecoveryTestExecution]:
        """Get recent test executions"""
        try:
            # This would typically query DynamoDB with time-based filters
            # For now, we'll return a placeholder
            return []
            
        except Exception as e:
            logging.error(f"Failed to get recent test executions: {str(e)}")
            return []
    
    async def _send_test_notification(self, test: RecoveryTest, execution: RecoveryTestExecution):
        """Send test completion notification"""
        try:
            if not self.notification_topic_arn:
                return
            
            message = {
                'test_id': test.test_id,
                'test_name': test.test_name,
                'execution_id': execution.execution_id,
                'status': execution.status.value,
                'actual_rto_minutes': execution.actual_rto_minutes,
                'expected_rto_minutes': test.expected_rto_minutes,
                'validation_results': execution.validation_results,
                'error_message': execution.error_message
            }
            
            subject = f"Recovery Test {'Completed' if execution.status == TestStatus.COMPLETED else 'Failed'}: {test.test_name}"
            
            self.sns.publish(
                TopicArn=self.notification_topic_arn,
                Message=json.dumps(message, indent=2),
                Subject=subject
            )
            
        except Exception as e:
            logging.error(f"Failed to send test notification: {str(e)}")
    
    async def _store_recovery_test(self, test: RecoveryTest):
        """Store recovery test in DynamoDB"""
        try:
            test_dict = asdict(test)
            test_dict['created_at'] = test.created_at.isoformat()
            
            self.tests_table.put_item(Item=test_dict)
            
        except Exception as e:
            logging.error(f"Failed to store recovery test: {str(e)}")
    
    async def _store_test_execution(self, execution: RecoveryTestExecution):
        """Store test execution in DynamoDB"""
        try:
            execution_dict = asdict(execution)
            execution_dict['started_at'] = execution.started_at.isoformat()
            if execution.completed_at:
                execution_dict['completed_at'] = execution.completed_at.isoformat()
            if execution.recovery_start_time:
                execution_dict['recovery_start_time'] = execution.recovery_start_time.isoformat()
            if execution.recovery_end_time:
                execution_dict['recovery_end_time'] = execution.recovery_end_time.isoformat()
            
            self.executions_table.put_item(Item=execution_dict)
            
        except Exception as e:
            logging.error(f"Failed to store test execution: {str(e)}")

# Usage example
async def main():
    config = {
        'tests_table': 'recovery-tests',
        'executions_table': 'recovery-test-executions',
        'test_environment_prefix': 'recovery-test',
        'notification_topic_arn': 'arn:aws:sns:us-east-1:123456789012:recovery-test-notifications',
        'restore_service_role_arn': 'arn:aws:iam::123456789012:role/AWSBackupDefaultServiceRole'
    }
    
    # Initialize recovery test manager
    test_manager = BackupRecoveryTestManager(config)
    
    # Create recovery test suite
    test_configs = [
        {
            'test_name': 'Production Database Full Recovery Test',
            'test_type': 'full_restore',
            'backup_arn': 'arn:aws:backup:us-east-1:123456789012:recovery-point:12345678-1234-1234-1234-123456789012',
            'target_environment': 'test',
            'test_schedule': 'weekly',
            'expected_rto_minutes': 60,
            'expected_rpo_minutes': 15,
            'validation_criteria': [
                {
                    'type': 'data_integrity',
                    'name': 'Database Record Count Validation',
                    'expected_records': 1000000
                },
                {
                    'type': 'connectivity',
                    'name': 'Database Connection Test',
                    'timeout_seconds': 30
                }
            ],
            'cleanup_required': True
        }
    ]
    
    created_tests = await test_manager.create_recovery_test_suite(test_configs)
    print(f"Created {len(created_tests)} recovery tests")
    
    # Execute a recovery test
    if created_tests:
        execution_id = await test_manager.execute_recovery_test(created_tests[0])
        print(f"Started recovery test execution: {execution_id}")
    
    # Generate test report
    report = await test_manager.generate_recovery_test_report()
    print(f"Generated recovery test report with {report['summary']['total_recovery_tests']} tests")

if __name__ == "__main__":
    import asyncio
    asyncio.run(main())