"""
Multi-Tenant Enterprise Integration Patterns for Scale & Optimize
Implements customer isolation, environment-specific configurations, and compliance frameworks
"""

from dataclasses import dataclass
from enum import Enum
from typing import Any, Dict, List, Optional

import boto3
from loguru import logger


class ComplianceFramework(Enum):
    """Supported enterprise compliance frameworks."""

    SOC2 = "soc2"
    AWS_WELL_ARCHITECTED = "aws_well_architected"
    ISO27001 = "iso27001"
    PCI_DSS = "pci_dss"
    HIPAA = "hipaa"
    GDPR = "gdpr"


@dataclass
class TenantConfig:
    """Configuration for individual tenant/customer."""

    tenant_id: str
    tenant_name: str
    account_filters: Dict[str, Any]  # Filtering rules for account selection
    compliance_requirements: List[ComplianceFramework]
    cost_allocation_tags: List[str]
    security_controls: Dict[str, Any]
    performance_targets: Dict[str, float]


@dataclass
class EnvironmentConfig:
    """Configuration for different environments (dev, staging, prod)."""

    environment_name: str
    account_pattern: str  # Regex pattern to match account names
    resource_limits: Dict[str, Any]
    monitoring_level: str  # basic, standard, enhanced
    backup_requirements: Dict[str, Any]


class MultiTenantIsolationEngine:
    """
    Enterprise multi-tenant isolation engine with customer data protection.

    Implements Scale & Optimize requirements for multi-customer deployment readiness.
    """

    def __init__(self):
        self.tenant_configs: Dict[str, TenantConfig] = {}
        self.environment_configs: Dict[str, EnvironmentConfig] = {}
        self.compliance_validators = {}

    def register_tenant(self, tenant_config: TenantConfig):
        """Register a new tenant with isolation configuration."""
        self.tenant_configs[tenant_config.tenant_id] = tenant_config
        logger.info(f"Registered tenant: {tenant_config.tenant_name}")

    def register_environment(self, env_config: EnvironmentConfig):
        """Register environment-specific configuration."""
        self.environment_configs[env_config.environment_name] = env_config
        logger.info(f"Registered environment: {env_config.environment_name}")

    def get_tenant_accounts(self, tenant_id: str, all_accounts: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
        """
        Get accounts that belong to specific tenant with strict isolation.

        Args:
            tenant_id: Tenant identifier
            all_accounts: List of all organization accounts

        Returns:
            Filtered list of accounts for this tenant only
        """
        if tenant_id not in self.tenant_configs:
            raise ValueError(f"Tenant {tenant_id} not registered")

        tenant_config = self.tenant_configs[tenant_id]
        tenant_accounts = []

        for account in all_accounts:
            if self._account_belongs_to_tenant(account, tenant_config):
                tenant_accounts.append(account)

        logger.info(f"Isolated {len(tenant_accounts)} accounts for tenant {tenant_id}")
        return tenant_accounts

    def _account_belongs_to_tenant(self, account: Dict[str, Any], tenant_config: TenantConfig) -> bool:
        """
        Determine if account belongs to tenant based on isolation rules.

        Production implementation would use:
        - Account tags matching
        - OU membership verification
        - Naming convention patterns
        - Custom tenant mapping tables
        """
        account_name = account.get("Name", "").lower()
        account_id = account.get("Id", "")

        filters = tenant_config.account_filters

        # Check name patterns
        if "name_patterns" in filters:
            for pattern in filters["name_patterns"]:
                if pattern.lower() in account_name:
                    return True

        # Check account IDs
        if "account_ids" in filters:
            if account_id in filters["account_ids"]:
                return True

        # Check OU membership (would integrate with AWS Organizations API)
        if "organizational_units" in filters:
            # Placeholder - would implement OU membership check
            return True

        return False

    def validate_compliance(self, tenant_id: str, resources: List[Dict[str, Any]]) -> Dict[str, Any]:
        """
        Validate resources against tenant's compliance requirements.

        Args:
            tenant_id: Tenant identifier
            resources: List of AWS resources to validate

        Returns:
            Compliance validation results
        """
        if tenant_id not in self.tenant_configs:
            raise ValueError(f"Tenant {tenant_id} not registered")

        tenant_config = self.tenant_configs[tenant_id]
        compliance_results = {
            "tenant_id": tenant_id,
            "total_resources_checked": len(resources),
            "compliance_status": {},
            "violations": [],
            "recommendations": [],
        }

        for framework in tenant_config.compliance_requirements:
            framework_results = self._validate_framework_compliance(framework, resources, tenant_config)
            compliance_results["compliance_status"][framework.value] = framework_results

        return compliance_results

    def _validate_framework_compliance(
        self, framework: ComplianceFramework, resources: List[Dict[str, Any]], tenant_config: TenantConfig
    ) -> Dict[str, Any]:
        """Validate resources against specific compliance framework."""

        if framework == ComplianceFramework.SOC2:
            return self._validate_soc2_compliance(resources, tenant_config)
        elif framework == ComplianceFramework.AWS_WELL_ARCHITECTED:
            return self._validate_well_architected_compliance(resources, tenant_config)
        elif framework == ComplianceFramework.ISO27001:
            return self._validate_iso27001_compliance(resources, tenant_config)
        else:
            return {"status": "not_implemented", "message": f"Validation for {framework.value} not yet implemented"}

    def _validate_soc2_compliance(self, resources: List[Dict[str, Any]], tenant_config: TenantConfig) -> Dict[str, Any]:
        """Validate SOC2 compliance requirements."""
        violations = []
        passed_checks = 0
        total_checks = 5  # Example SOC2 checks

        # SOC2 Trust Service Criteria validation
        security_controls = tenant_config.security_controls

        # Security - Encryption at rest required
        encrypted_resources = 0
        for resource in resources:
            # Simplified check - would implement proper encryption validation
            if resource.get("encrypted", False):
                encrypted_resources += 1

        if encrypted_resources / len(resources) < 0.9:  # 90% encryption requirement
            violations.append(
                {
                    "control": "CC6.1 - Encryption at Rest",
                    "severity": "high",
                    "description": f"Only {encrypted_resources}/{len(resources)} resources encrypted",
                }
            )
        else:
            passed_checks += 1

        # Availability - Backup requirements
        backed_up_resources = sum(1 for r in resources if r.get("backup_enabled", False))
        if backed_up_resources / len(resources) < 0.8:  # 80% backup requirement
            violations.append(
                {
                    "control": "A1.2 - Backup and Recovery",
                    "severity": "medium",
                    "description": f"Only {backed_up_resources}/{len(resources)} resources have backup enabled",
                }
            )
        else:
            passed_checks += 1

        # Processing Integrity - Resource tagging
        tagged_resources = sum(1 for r in resources if r.get("tags"))
        if tagged_resources / len(resources) < 0.95:  # 95% tagging requirement
            violations.append(
                {
                    "control": "PI1.1 - Resource Identification",
                    "severity": "low",
                    "description": f"Only {tagged_resources}/{len(resources)} resources properly tagged",
                }
            )
        else:
            passed_checks += 1

        compliance_score = (passed_checks / total_checks) * 100

        return {
            "framework": "SOC2",
            "compliance_score": compliance_score,
            "status": "compliant" if compliance_score >= 90 else "non_compliant",
            "violations": violations,
            "total_checks": total_checks,
            "passed_checks": passed_checks,
        }

    def _validate_well_architected_compliance(
        self, resources: List[Dict[str, Any]], tenant_config: TenantConfig
    ) -> Dict[str, Any]:
        """Validate AWS Well-Architected Framework compliance."""
        pillars_score = {
            "operational_excellence": 0,
            "security": 0,
            "reliability": 0,
            "performance_efficiency": 0,
            "cost_optimization": 0,
            "sustainability": 0,
        }

        # Operational Excellence pillar
        monitored_resources = sum(1 for r in resources if r.get("monitoring_enabled", False))
        pillars_score["operational_excellence"] = (monitored_resources / len(resources)) * 100

        # Security pillar
        secure_resources = sum(1 for r in resources if r.get("security_compliant", False))
        pillars_score["security"] = (secure_resources / len(resources)) * 100

        # Reliability pillar
        ha_resources = sum(1 for r in resources if r.get("high_availability", False))
        pillars_score["reliability"] = (ha_resources / len(resources)) * 100

        # Performance Efficiency pillar
        optimized_resources = sum(1 for r in resources if r.get("performance_optimized", False))
        pillars_score["performance_efficiency"] = (optimized_resources / len(resources)) * 100

        # Cost Optimization pillar
        cost_optimized_resources = sum(1 for r in resources if r.get("cost_optimized", False))
        pillars_score["cost_optimization"] = (cost_optimized_resources / len(resources)) * 100

        # Sustainability pillar
        sustainable_resources = sum(1 for r in resources if r.get("sustainability_optimized", False))
        pillars_score["sustainability"] = (sustainable_resources / len(resources)) * 100

        overall_score = sum(pillars_score.values()) / len(pillars_score)

        return {
            "framework": "AWS Well-Architected",
            "overall_score": overall_score,
            "pillar_scores": pillars_score,
            "status": "well_architected" if overall_score >= 80 else "needs_improvement",
        }

    def _validate_iso27001_compliance(
        self, resources: List[Dict[str, Any]], tenant_config: TenantConfig
    ) -> Dict[str, Any]:
        """Validate ISO27001 compliance requirements."""
        # Simplified ISO27001 validation
        # Production would implement full 114 controls assessment

        control_results = {}

        # A.8 Asset Management
        asset_inventory_complete = all(r.get("asset_tagged", False) for r in resources)
        control_results["A.8.1.1"] = {
            "description": "Asset Inventory",
            "compliant": asset_inventory_complete,
            "evidence": f"{sum(1 for r in resources if r.get('asset_tagged', False))}/{len(resources)} assets properly tagged",
        }

        # A.12 Operations Security
        change_management = all(r.get("change_controlled", True) for r in resources)
        control_results["A.12.1.2"] = {
            "description": "Change Management",
            "compliant": change_management,
            "evidence": "Change control procedures applied",
        }

        compliant_controls = sum(1 for c in control_results.values() if c["compliant"])
        total_controls = len(control_results)
        compliance_percentage = (compliant_controls / total_controls) * 100

        return {
            "framework": "ISO27001",
            "compliance_percentage": compliance_percentage,
            "status": "compliant" if compliance_percentage >= 95 else "non_compliant",
            "control_results": control_results,
            "compliant_controls": compliant_controls,
            "total_controls": total_controls,
        }


class EnterpriseDeploymentManager:
    """
    Enterprise deployment manager for multi-customer production readiness.

    Handles deployment across multiple customer environments with isolation.
    """

    def __init__(self, isolation_engine: MultiTenantIsolationEngine):
        self.isolation_engine = isolation_engine
        self.deployment_history = []

    def deploy_to_customer_environment(
        self, tenant_id: str, environment_name: str, deployment_config: Dict[str, Any]
    ) -> Dict[str, Any]:
        """
        Deploy CloudOps automation to specific customer environment.

        Args:
            tenant_id: Customer/tenant identifier
            environment_name: Target environment (dev, staging, prod)
            deployment_config: Deployment configuration

        Returns:
            Deployment results with status and metrics
        """
        logger.info(f"Starting deployment to {tenant_id}/{environment_name}")

        # Validate tenant and environment
        if tenant_id not in self.isolation_engine.tenant_configs:
            raise ValueError(f"Tenant {tenant_id} not registered")

        if environment_name not in self.isolation_engine.environment_configs:
            raise ValueError(f"Environment {environment_name} not registered")

        tenant_config = self.isolation_engine.tenant_configs[tenant_id]
        env_config = self.isolation_engine.environment_configs[environment_name]

        deployment_result = {
            "tenant_id": tenant_id,
            "environment": environment_name,
            "deployment_id": f"{tenant_id}-{environment_name}-{len(self.deployment_history)}",
            "status": "in_progress",
            "components_deployed": [],
            "compliance_validation": {},
            "performance_validation": {},
            "rollback_plan": {},
        }

        try:
            # Phase 1: Pre-deployment compliance validation
            compliance_results = self._validate_pre_deployment_compliance(tenant_config, env_config, deployment_config)
            deployment_result["compliance_validation"] = compliance_results

            if not compliance_results.get("approved", False):
                deployment_result["status"] = "failed"
                deployment_result["error"] = "Pre-deployment compliance validation failed"
                return deployment_result

            # Phase 2: Deploy components with isolation
            components = self._deploy_isolated_components(tenant_config, env_config, deployment_config)
            deployment_result["components_deployed"] = components

            # Phase 3: Post-deployment validation
            performance_results = self._validate_post_deployment_performance(tenant_config, env_config, components)
            deployment_result["performance_validation"] = performance_results

            # Phase 4: Create rollback plan
            rollback_plan = self._create_rollback_plan(components)
            deployment_result["rollback_plan"] = rollback_plan

            deployment_result["status"] = "completed"

        except Exception as e:
            deployment_result["status"] = "failed"
            deployment_result["error"] = str(e)
            logger.error(f"Deployment failed for {tenant_id}/{environment_name}: {e}")

        self.deployment_history.append(deployment_result)
        return deployment_result

    def _validate_pre_deployment_compliance(
        self, tenant_config: TenantConfig, env_config: EnvironmentConfig, deployment_config: Dict[str, Any]
    ) -> Dict[str, Any]:
        """Validate compliance requirements before deployment."""

        validation_results = {
            "approved": True,
            "compliance_checks": [],
            "security_validation": True,
            "resource_limits_check": True,
        }

        # Check compliance framework requirements
        for framework in tenant_config.compliance_requirements:
            check_result = {
                "framework": framework.value,
                "status": "passed",
                "details": f"Pre-deployment validation for {framework.value} completed",
            }
            validation_results["compliance_checks"].append(check_result)

        # Validate resource limits for environment
        resource_limits = env_config.resource_limits
        requested_resources = deployment_config.get("resources", {})

        for resource_type, limit in resource_limits.items():
            requested = requested_resources.get(resource_type, 0)
            if requested > limit:
                validation_results["approved"] = False
                validation_results["resource_limits_check"] = False
                logger.warning(f"Resource limit exceeded: {resource_type} requested={requested}, limit={limit}")

        return validation_results

    def _deploy_isolated_components(
        self, tenant_config: TenantConfig, env_config: EnvironmentConfig, deployment_config: Dict[str, Any]
    ) -> List[Dict[str, Any]]:
        """Deploy CloudOps components with proper tenant isolation."""

        deployed_components = []

        # Core components to deploy
        components = ["inventory_collector", "cost_analyzer", "security_baseline", "compliance_auditor"]

        for component in components:
            component_result = {
                "component": component,
                "status": "deployed",
                "configuration": {
                    "tenant_isolation": True,
                    "environment": env_config.environment_name,
                    "compliance_frameworks": [f.value for f in tenant_config.compliance_requirements],
                    "cost_allocation_tags": tenant_config.cost_allocation_tags,
                },
                "endpoints": {
                    "api": f"https://{component}-{tenant_config.tenant_id}.cloudops.local",
                    "dashboard": f"https://dashboard-{tenant_config.tenant_id}.cloudops.local",
                },
            }
            deployed_components.append(component_result)

        return deployed_components

    def _validate_post_deployment_performance(
        self, tenant_config: TenantConfig, env_config: EnvironmentConfig, components: List[Dict[str, Any]]
    ) -> Dict[str, Any]:
        """Validate performance targets after deployment."""

        performance_results = {"overall_status": "passed", "component_performance": {}, "targets_met": True}

        targets = tenant_config.performance_targets

        for component in components:
            component_name = component["component"]

            # Simulate performance validation
            performance_metrics = {
                "response_time_ms": 150,  # Simulated
                "throughput_ops_sec": 1000,  # Simulated
                "error_rate_percent": 0.1,  # Simulated
                "availability_percent": 99.9,  # Simulated
            }

            # Check against targets
            meets_targets = True
            if "response_time_ms" in targets:
                if performance_metrics["response_time_ms"] > targets["response_time_ms"]:
                    meets_targets = False

            performance_results["component_performance"][component_name] = {
                "metrics": performance_metrics,
                "meets_targets": meets_targets,
            }

            if not meets_targets:
                performance_results["targets_met"] = False

        if not performance_results["targets_met"]:
            performance_results["overall_status"] = "warning"

        return performance_results

    def _create_rollback_plan(self, components: List[Dict[str, Any]]) -> Dict[str, Any]:
        """Create rollback plan for deployment."""

        return {
            "rollback_available": True,
            "rollback_components": [c["component"] for c in components],
            "estimated_rollback_time_minutes": len(components) * 5,
            "rollback_steps": [
                "Stop new deployments",
                "Drain traffic from new components",
                "Restore previous component versions",
                "Validate rollback success",
                "Clean up failed deployment artifacts",
            ],
        }

    def get_deployment_status(self, deployment_id: str) -> Optional[Dict[str, Any]]:
        """Get status of specific deployment."""
        for deployment in self.deployment_history:
            if deployment["deployment_id"] == deployment_id:
                return deployment
        return None

    def list_tenant_deployments(self, tenant_id: str) -> List[Dict[str, Any]]:
        """List all deployments for specific tenant."""
        return [d for d in self.deployment_history if d["tenant_id"] == tenant_id]


# Example usage and integration
def create_enterprise_demo_config():
    """Create demo configuration for enterprise multi-tenant setup."""

    isolation_engine = MultiTenantIsolationEngine()

    # Register tenants
    customer_a = TenantConfig(
        tenant_id="customer_a",
        tenant_name="Acme Corporation",
        account_filters={"name_patterns": ["acme-prod", "acme-staging"], "organizational_units": ["ou-acme-*"]},
        compliance_requirements=[ComplianceFramework.SOC2, ComplianceFramework.AWS_WELL_ARCHITECTED],
        cost_allocation_tags=["Customer", "Environment", "Project"],
        security_controls={"encryption_required": True, "mfa_required": True, "network_isolation": True},
        performance_targets={"response_time_ms": 200, "availability_percent": 99.9},
    )

    customer_b = TenantConfig(
        tenant_id="customer_b",
        tenant_name="Beta Industries",
        account_filters={"name_patterns": ["beta-prod", "beta-dev"], "account_ids": ["123456789012", "234567890123"]},
        compliance_requirements=[ComplianceFramework.ISO27001, ComplianceFramework.PCI_DSS],
        cost_allocation_tags=["Customer", "CostCenter", "Application"],
        security_controls={"encryption_required": True, "audit_logging": True, "access_controls": True},
        performance_targets={"response_time_ms": 150, "availability_percent": 99.95},
    )

    isolation_engine.register_tenant(customer_a)
    isolation_engine.register_tenant(customer_b)

    # Register environments
    prod_env = EnvironmentConfig(
        environment_name="production",
        account_pattern=".*-prod.*",
        resource_limits={"max_ec2_instances": 100, "max_storage_gb": 10000, "max_rds_instances": 20},
        monitoring_level="enhanced",
        backup_requirements={"frequency": "daily", "retention_days": 90},
    )

    staging_env = EnvironmentConfig(
        environment_name="staging",
        account_pattern=".*-staging.*",
        resource_limits={"max_ec2_instances": 20, "max_storage_gb": 2000, "max_rds_instances": 5},
        monitoring_level="standard",
        backup_requirements={"frequency": "weekly", "retention_days": 30},
    )

    isolation_engine.register_environment(prod_env)
    isolation_engine.register_environment(staging_env)

    # Create deployment manager
    deployment_manager = EnterpriseDeploymentManager(isolation_engine)

    return isolation_engine, deployment_manager
