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 time

class LocationType(Enum):
    REGION = "region"
    AVAILABILITY_ZONE = "availability_zone"
    EDGE_LOCATION = "edge_location"

class DeploymentStatus(Enum):
    PENDING = "pending"
    DEPLOYING = "deploying"
    ACTIVE = "active"
    FAILED = "failed"
    MAINTENANCE = "maintenance"

@dataclass
class DeploymentLocation:
    location_id: str
    location_type: LocationType
    region_name: str
    availability_zone: Optional[str]
    is_primary: bool
    capacity_percentage: int
    health_status: str
    last_health_check: datetime
    deployment_status: DeploymentStatus

@dataclass
class MultiLocationDeployment:
    deployment_id: str
    workload_name: str
    locations: List[DeploymentLocation]
    traffic_distribution: Dict[str, int]
    failover_policy: Dict[str, Any]
    data_replication_config: Dict[str, Any]
    created_at: datetime
    updated_at: datetime

class MultiLocationDeploymentManager:
    """Comprehensive multi-location deployment management system"""
    
    def __init__(self, config: Dict[str, Any]):
        self.config = config
        
        # AWS clients for different regions
        self.clients = {}
        self.regions = config.get('regions', ['us-east-1', 'us-west-2', 'eu-west-1'])
        
        # Initialize clients for each region
        for region in self.regions:
            self.clients[region] = {
                'ec2': boto3.client('ec2', region_name=region),
                'elbv2': boto3.client('elbv2', region_name=region),
                'route53': boto3.client('route53', region_name=region),
                'cloudformation': boto3.client('cloudformation', region_name=region),
                'rds': boto3.client('rds', region_name=region),
                'dynamodb': boto3.client('dynamodb', region_name=region),
                'lambda': boto3.client('lambda', region_name=region),
                'cloudwatch': boto3.client('cloudwatch', region_name=region)
            }
        
        # Global services
        self.route53 = boto3.client('route53')
        self.cloudfront = boto3.client('cloudfront')
        self.dynamodb = boto3.resource('dynamodb', region_name=self.regions[0])
        
        # Storage
        self.deployments_table = self.dynamodb.Table(config.get('deployments_table', 'multi-location-deployments'))
        
        # Active deployments
        self.active_deployments = {}
        
    async def create_multi_location_deployment(self, deployment_config: Dict[str, Any]) -> str:
        """Create multi-location deployment"""
        try:
            deployment_id = f"deploy_{int(datetime.utcnow().timestamp())}_{deployment_config['workload_name']}"
            
            # Create deployment locations
            locations = []
            for location_config in deployment_config['locations']:
                location = DeploymentLocation(
                    location_id=f"{location_config['region']}_{location_config.get('az', 'multi-az')}",
                    location_type=LocationType.REGION if not location_config.get('az') else LocationType.AVAILABILITY_ZONE,
                    region_name=location_config['region'],
                    availability_zone=location_config.get('az'),
                    is_primary=location_config.get('is_primary', False),
                    capacity_percentage=location_config.get('capacity_percentage', 100),
                    health_status='unknown',
                    last_health_check=datetime.utcnow(),
                    deployment_status=DeploymentStatus.PENDING
                )
                locations.append(location)
            
            # Create deployment record
            deployment = MultiLocationDeployment(
                deployment_id=deployment_id,
                workload_name=deployment_config['workload_name'],
                locations=locations,
                traffic_distribution=deployment_config.get('traffic_distribution', {}),
                failover_policy=deployment_config.get('failover_policy', {}),
                data_replication_config=deployment_config.get('data_replication_config', {}),
                created_at=datetime.utcnow(),
                updated_at=datetime.utcnow()
            )
            
            # Store deployment
            await self._store_deployment(deployment)
            
            # Start deployment process
            self.active_deployments[deployment_id] = deployment
            asyncio.create_task(self._execute_multi_location_deployment(deployment))
            
            logging.info(f"Created multi-location deployment: {deployment_id}")
            return deployment_id
            
        except Exception as e:
            logging.error(f"Failed to create multi-location deployment: {str(e)}")
            raise
    
    async def _execute_multi_location_deployment(self, deployment: MultiLocationDeployment):
        """Execute deployment across multiple locations"""
        try:
            # Deploy to each location
            for location in deployment.locations:
                location.deployment_status = DeploymentStatus.DEPLOYING
                await self._store_deployment(deployment)
                
                try:
                    await self._deploy_to_location(deployment, location)
                    location.deployment_status = DeploymentStatus.ACTIVE
                    location.health_status = 'healthy'
                except Exception as location_error:
                    logging.error(f"Deployment failed for location {location.location_id}: {str(location_error)}")
                    location.deployment_status = DeploymentStatus.FAILED
                    location.health_status = 'unhealthy'
                
                location.last_health_check = datetime.utcnow()
                await self._store_deployment(deployment)
            
            # Configure cross-location networking
            await self._configure_cross_location_networking(deployment)
            
            # Set up data replication
            await self._configure_data_replication(deployment)
            
            # Configure traffic distribution
            await self._configure_traffic_distribution(deployment)
            
            # Start health monitoring
            asyncio.create_task(self._monitor_deployment_health(deployment))
            
            logging.info(f"Multi-location deployment completed: {deployment.deployment_id}")
            
        except Exception as e:
            logging.error(f"Multi-location deployment failed: {str(e)}")
            # Mark all locations as failed
            for location in deployment.locations:
                location.deployment_status = DeploymentStatus.FAILED
            await self._store_deployment(deployment)
    
    async def _deploy_to_location(self, deployment: MultiLocationDeployment, location: DeploymentLocation):
        """Deploy workload to specific location"""
        try:
            region = location.region_name
            clients = self.clients[region]
            
            # Create VPC if needed
            vpc_id = await self._ensure_vpc_exists(region, clients)
            
            # Create subnets across AZs
            subnet_ids = await self._ensure_subnets_exist(region, vpc_id, clients)
            
            # Deploy application infrastructure
            await self._deploy_application_infrastructure(deployment, location, vpc_id, subnet_ids, clients)
            
            # Deploy application services
            await self._deploy_application_services(deployment, location, clients)
            
            # Configure monitoring
            await self._configure_location_monitoring(deployment, location, clients)
            
            logging.info(f"Successfully deployed to location: {location.location_id}")
            
        except Exception as e:
            logging.error(f"Failed to deploy to location {location.location_id}: {str(e)}")
            raise
    
    async def _ensure_vpc_exists(self, region: str, clients: Dict[str, Any]) -> str:
        """Ensure VPC exists in region"""
        try:
            ec2 = clients['ec2']
            
            # Check for existing VPC
            vpc_name = f"{self.config.get('workload_name', 'workload')}-vpc"
            
            response = ec2.describe_vpcs(
                Filters=[
                    {'Name': 'tag:Name', 'Values': [vpc_name]},
                    {'Name': 'state', 'Values': ['available']}
                ]
            )
            
            if response['Vpcs']:
                return response['Vpcs'][0]['VpcId']
            
            # Create new VPC
            vpc_response = ec2.create_vpc(
                CidrBlock='10.0.0.0/16',
                TagSpecifications=[
                    {
                        'ResourceType': 'vpc',
                        'Tags': [
                            {'Key': 'Name', 'Value': vpc_name},
                            {'Key': 'Environment', 'Value': self.config.get('environment', 'production')}
                        ]
                    }
                ]
            )
            
            vpc_id = vpc_response['Vpc']['VpcId']
            
            # Enable DNS hostnames and resolution
            ec2.modify_vpc_attribute(VpcId=vpc_id, EnableDnsHostnames={'Value': True})
            ec2.modify_vpc_attribute(VpcId=vpc_id, EnableDnsSupport={'Value': True})
            
            # Create internet gateway
            igw_response = ec2.create_internet_gateway(
                TagSpecifications=[
                    {
                        'ResourceType': 'internet-gateway',
                        'Tags': [{'Key': 'Name', 'Value': f"{vpc_name}-igw"}]
                    }
                ]
            )
            
            igw_id = igw_response['InternetGateway']['InternetGatewayId']
            ec2.attach_internet_gateway(InternetGatewayId=igw_id, VpcId=vpc_id)
            
            logging.info(f"Created VPC {vpc_id} in region {region}")
            return vpc_id
            
        except Exception as e:
            logging.error(f"Failed to ensure VPC exists in {region}: {str(e)}")
            raise
    
    async def _ensure_subnets_exist(self, region: str, vpc_id: str, clients: Dict[str, Any]) -> List[str]:
        """Ensure subnets exist across AZs"""
        try:
            ec2 = clients['ec2']
            
            # Get available AZs
            az_response = ec2.describe_availability_zones(
                Filters=[{'Name': 'state', 'Values': ['available']}]
            )
            
            azs = [az['ZoneName'] for az in az_response['AvailabilityZones']][:3]  # Use first 3 AZs
            subnet_ids = []
            
            for i, az in enumerate(azs):
                subnet_name = f"{self.config.get('workload_name', 'workload')}-subnet-{az}"
                
                # Check for existing subnet
                subnet_response = ec2.describe_subnets(
                    Filters=[
                        {'Name': 'tag:Name', 'Values': [subnet_name]},
                        {'Name': 'vpc-id', 'Values': [vpc_id]}
                    ]
                )
                
                if subnet_response['Subnets']:
                    subnet_ids.append(subnet_response['Subnets'][0]['SubnetId'])
                    continue
                
                # Create subnet
                cidr_block = f"10.0.{i+1}.0/24"
                
                create_response = ec2.create_subnet(
                    VpcId=vpc_id,
                    CidrBlock=cidr_block,
                    AvailabilityZone=az,
                    TagSpecifications=[
                        {
                            'ResourceType': 'subnet',
                            'Tags': [
                                {'Key': 'Name', 'Value': subnet_name},
                                {'Key': 'Type', 'Value': 'public'}
                            ]
                        }
                    ]
                )
                
                subnet_id = create_response['Subnet']['SubnetId']
                subnet_ids.append(subnet_id)
                
                # Enable auto-assign public IP
                ec2.modify_subnet_attribute(
                    SubnetId=subnet_id,
                    MapPublicIpOnLaunch={'Value': True}
                )
            
            logging.info(f"Ensured {len(subnet_ids)} subnets exist in region {region}")
            return subnet_ids
            
        except Exception as e:
            logging.error(f"Failed to ensure subnets exist in {region}: {str(e)}")
            raise
    
    async def _deploy_application_infrastructure(self, deployment: MultiLocationDeployment, 
                                               location: DeploymentLocation, vpc_id: str, 
                                               subnet_ids: List[str], clients: Dict[str, Any]):
        """Deploy application infrastructure to location"""
        try:
            # Create security groups
            security_group_id = await self._create_security_group(vpc_id, clients['ec2'])
            
            # Create load balancer
            lb_arn = await self._create_load_balancer(subnet_ids, security_group_id, clients['elbv2'])
            
            # Create target group
            target_group_arn = await self._create_target_group(vpc_id, clients['elbv2'])
            
            # Create listener
            await self._create_load_balancer_listener(lb_arn, target_group_arn, clients['elbv2'])
            
            # Store infrastructure details
            location.infrastructure_details = {
                'vpc_id': vpc_id,
                'subnet_ids': subnet_ids,
                'security_group_id': security_group_id,
                'load_balancer_arn': lb_arn,
                'target_group_arn': target_group_arn
            }
            
            logging.info(f"Deployed infrastructure to location: {location.location_id}")
            
        except Exception as e:
            logging.error(f"Failed to deploy infrastructure to {location.location_id}: {str(e)}")
            raise
    
    async def _create_security_group(self, vpc_id: str, ec2_client) -> str:
        """Create security group for application"""
        try:
            sg_name = f"{self.config.get('workload_name', 'workload')}-sg"
            
            response = ec2_client.create_security_group(
                GroupName=sg_name,
                Description=f"Security group for {self.config.get('workload_name', 'workload')}",
                VpcId=vpc_id,
                TagSpecifications=[
                    {
                        'ResourceType': 'security-group',
                        'Tags': [{'Key': 'Name', 'Value': sg_name}]
                    }
                ]
            )
            
            sg_id = response['GroupId']
            
            # Add ingress rules
            ec2_client.authorize_security_group_ingress(
                GroupId=sg_id,
                IpPermissions=[
                    {
                        'IpProtocol': 'tcp',
                        'FromPort': 80,
                        'ToPort': 80,
                        'IpRanges': [{'CidrIp': '0.0.0.0/0'}]
                    },
                    {
                        'IpProtocol': 'tcp',
                        'FromPort': 443,
                        'ToPort': 443,
                        'IpRanges': [{'CidrIp': '0.0.0.0/0'}]
                    }
                ]
            )
            
            return sg_id
            
        except Exception as e:
            logging.error(f"Failed to create security group: {str(e)}")
            raise
    
    async def _create_load_balancer(self, subnet_ids: List[str], security_group_id: str, elbv2_client) -> str:
        """Create application load balancer"""
        try:
            lb_name = f"{self.config.get('workload_name', 'workload')}-alb"
            
            response = elbv2_client.create_load_balancer(
                Name=lb_name,
                Subnets=subnet_ids,
                SecurityGroups=[security_group_id],
                Scheme='internet-facing',
                Type='application',
                IpAddressType='ipv4',
                Tags=[
                    {'Key': 'Name', 'Value': lb_name}
                ]
            )
            
            return response['LoadBalancers'][0]['LoadBalancerArn']
            
        except Exception as e:
            logging.error(f"Failed to create load balancer: {str(e)}")
            raise
    
    async def _configure_cross_location_networking(self, deployment: MultiLocationDeployment):
        """Configure networking between locations"""
        try:
            # Configure VPC peering between regions
            await self._setup_vpc_peering(deployment)
            
            # Configure Route 53 health checks
            await self._setup_route53_health_checks(deployment)
            
            # Configure DNS failover
            await self._setup_dns_failover(deployment)
            
            logging.info("Cross-location networking configured successfully")
            
        except Exception as e:
            logging.error(f"Failed to configure cross-location networking: {str(e)}")
            raise
    
    async def _configure_data_replication(self, deployment: MultiLocationDeployment):
        """Configure data replication between locations"""
        try:
            replication_config = deployment.data_replication_config
            
            if replication_config.get('rds_replication'):
                await self._setup_rds_cross_region_replication(deployment)
            
            if replication_config.get('s3_replication'):
                await self._setup_s3_cross_region_replication(deployment)
            
            if replication_config.get('dynamodb_global_tables'):
                await self._setup_dynamodb_global_tables(deployment)
            
            logging.info("Data replication configured successfully")
            
        except Exception as e:
            logging.error(f"Failed to configure data replication: {str(e)}")
            raise
    
    async def _configure_traffic_distribution(self, deployment: MultiLocationDeployment):
        """Configure traffic distribution across locations"""
        try:
            # Create Route 53 hosted zone if needed
            hosted_zone_id = await self._ensure_hosted_zone_exists(deployment.workload_name)
            
            # Configure weighted routing
            await self._configure_weighted_routing(deployment, hosted_zone_id)
            
            # Configure health check based routing
            await self._configure_health_check_routing(deployment, hosted_zone_id)
            
            logging.info("Traffic distribution configured successfully")
            
        except Exception as e:
            logging.error(f"Failed to configure traffic distribution: {str(e)}")
            raise
    
    async def _monitor_deployment_health(self, deployment: MultiLocationDeployment):
        """Monitor health of multi-location deployment"""
        try:
            while deployment.deployment_id in self.active_deployments:
                for location in deployment.locations:
                    if location.deployment_status == DeploymentStatus.ACTIVE:
                        # Perform health check
                        health_status = await self._check_location_health(location)
                        location.health_status = health_status
                        location.last_health_check = datetime.utcnow()
                        
                        # Handle unhealthy locations
                        if health_status == 'unhealthy':
                            await self._handle_unhealthy_location(deployment, location)
                
                # Update deployment record
                deployment.updated_at = datetime.utcnow()
                await self._store_deployment(deployment)
                
                # Wait before next health check
                await asyncio.sleep(60)  # Check every minute
                
        except Exception as e:
            logging.error(f"Health monitoring failed: {str(e)}")
    
    async def _check_location_health(self, location: DeploymentLocation) -> str:
        """Check health of specific location"""
        try:
            # This would implement actual health checks
            # For now, we'll simulate health status
            import random
            return 'healthy' if random.random() > 0.1 else 'unhealthy'
            
        except Exception as e:
            logging.error(f"Health check failed for {location.location_id}: {str(e)}")
            return 'unhealthy'
    
    async def _handle_unhealthy_location(self, deployment: MultiLocationDeployment, location: DeploymentLocation):
        """Handle unhealthy location"""
        try:
            # Implement failover logic
            healthy_locations = [l for l in deployment.locations if l.health_status == 'healthy']
            
            if healthy_locations:
                # Redistribute traffic away from unhealthy location
                await self._redistribute_traffic(deployment, location, healthy_locations)
                
                # Attempt to recover unhealthy location
                asyncio.create_task(self._attempt_location_recovery(deployment, location))
            else:
                # All locations unhealthy - trigger emergency procedures
                await self._trigger_emergency_procedures(deployment)
            
        except Exception as e:
            logging.error(f"Failed to handle unhealthy location: {str(e)}")
    
    async def _store_deployment(self, deployment: MultiLocationDeployment):
        """Store deployment record in DynamoDB"""
        try:
            deployment_dict = asdict(deployment)
            deployment_dict['created_at'] = deployment.created_at.isoformat()
            deployment_dict['updated_at'] = deployment.updated_at.isoformat()
            
            # Convert locations to dict format
            deployment_dict['locations'] = []
            for location in deployment.locations:
                location_dict = asdict(location)
                location_dict['last_health_check'] = location.last_health_check.isoformat()
                deployment_dict['locations'].append(location_dict)
            
            self.deployments_table.put_item(Item=deployment_dict)
            
        except Exception as e:
            logging.error(f"Failed to store deployment: {str(e)}")

# Usage example
async def main():
    config = {
        'regions': ['us-east-1', 'us-west-2', 'eu-west-1'],
        'deployments_table': 'multi-location-deployments',
        'workload_name': 'web-application',
        'environment': 'production'
    }
    
    # Initialize multi-location deployment manager
    deployment_manager = MultiLocationDeploymentManager(config)
    
    # Create multi-location deployment
    deployment_config = {
        'workload_name': 'web-application',
        'locations': [
            {
                'region': 'us-east-1',
                'is_primary': True,
                'capacity_percentage': 50
            },
            {
                'region': 'us-west-2',
                'is_primary': False,
                'capacity_percentage': 30
            },
            {
                'region': 'eu-west-1',
                'is_primary': False,
                'capacity_percentage': 20
            }
        ],
        'traffic_distribution': {
            'us-east-1': 50,
            'us-west-2': 30,
            'eu-west-1': 20
        },
        'failover_policy': {
            'automatic_failover': True,
            'failover_threshold': 2,  # minutes
            'recovery_threshold': 5   # minutes
        },
        'data_replication_config': {
            'rds_replication': True,
            's3_replication': True,
            'dynamodb_global_tables': True
        }
    }
    
    # Create deployment
    deployment_id = await deployment_manager.create_multi_location_deployment(deployment_config)
    print(f"Created multi-location deployment: {deployment_id}")

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