#!/usr/bin/env python3
"""
Database Persistence Layer

This module implements production-grade database persistence for collateral packets.
No mocks, no simulations - real database operations.

Architecture:
1. SQLAlchemy ORM models for all entities
2. Database connection management
3. CRUD operations for collateral packets
4. Transaction tracking and income recording
5. Risk assessment persistence
"""

from typing import Dict, Any, List, Optional
from datetime import datetime
from enum import Enum
import logging
import os

from sqlalchemy import create_engine, Column, String, Float, Integer, DateTime, Boolean, Text, JSON, ForeignKey
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, relationship
from sqlalchemy.exc import SQLAlchemyError

# Configure logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

Base = declarative_base()


class CollateralTypeEnum(str, Enum):
    """Collateral type enum for database."""
    CODE_LICENSE = "code_license"
    API_ACCESS = "api_access"
    WHITE_LABEL = "white_label"
    MAINTENANCE_CONTRACT = "maintenance_contract"
    SUPPORT_CONTRACT = "support_contract"
    TRAINING_CERTIFICATION = "training_certification"


class IncomeSourceEnum(str, Enum):
    """Income source enum for database."""
    LICENSING_FEES = "licensing_fees"
    API_USAGE_REVENUE = "api_usage_revenue"
    MAINTENANCE_REVENUE = "maintenance_revenue"
    SUPPORT_REVENUE = "support_revenue"
    TRAINING_REVENUE = "training_revenue"
    YIELD_FARMING = "yield_farming"
    STAKING_REWARDS = "staking_rewards"


class PaymentRailEnum(str, Enum):
    """Payment rail enum for database."""
    STRIPE = "stripe"
    SOLANA = "solana"


class TransactionStatusEnum(str, Enum):
    """Transaction status enum for database."""
    PENDING = "pending"
    COMPLETED = "completed"
    FAILED = "failed"
    REFUNDED = "refunded"


class RiskLevelEnum(str, Enum):
    """Risk level enum for database."""
    VERY_LOW = "very_low"
    LOW = "low"
    MEDIUM = "medium"
    HIGH = "high"
    VERY_HIGH = "very_high"


class CollateralPacket(Base):
    """Collateral packet database model."""
    __tablename__ = 'collateral_packets'
    
    id = Column(String, primary_key=True)
    asset_id = Column(String, nullable=False, index=True)
    collateral_type = Column(String, nullable=False)
    
    # Valuation
    base_value_usd = Column(Float, nullable=False)
    collateral_value_usd = Column(Float, nullable=False)
    risk_adjusted_value_usd = Column(Float, nullable=False)
    collateral_multiplier = Column(Float, nullable=False)
    confidence_score = Column(Float, nullable=False)
    valuation_method = Column(String, nullable=False)
    
    # Income
    total_expected_annual_income_usd = Column(Float, nullable=False)
    total_actual_annual_income_usd = Column(Float, default=0.0)
    combined_multiplier = Column(Float, nullable=False)
    
    # Metadata
    created_at = Column(DateTime, nullable=False, default=datetime.utcnow)
    expires_at = Column(DateTime, nullable=True)
    status = Column(String, nullable=False, default='active')
    
    # Relationships
    income_streams = relationship("IncomeStream", back_populates="collateral_packet", cascade="all, delete-orphan")
    transactions = relationship("Transaction", back_populates="collateral_packet", cascade="all, delete-orphan")
    risk_assessment = relationship("RiskAssessment", back_populates="collateral_packet", uselist=False, cascade="all, delete-orphan")


class IncomeStream(Base):
    """Income stream database model."""
    __tablename__ = 'income_streams'
    
    id = Column(String, primary_key=True)
    collateral_packet_id = Column(String, ForeignKey('collateral_packets.id'), nullable=False)
    
    source = Column(String, nullable=False)
    expected_annual_income_usd = Column(Float, nullable=False)
    actual_annual_income_usd = Column(Float, default=0.0)
    multiplier = Column(Float, nullable=False)
    
    start_date = Column(DateTime, nullable=False)
    end_date = Column(DateTime, nullable=True)
    active = Column(Boolean, default=True)
    last_payout_date = Column(DateTime, nullable=True)
    payout_frequency = Column(String, default='monthly')
    
    # Relationship
    collateral_packet = relationship("CollateralPacket", back_populates="income_streams")


class Transaction(Base):
    """Transaction database model."""
    __tablename__ = 'transactions'
    
    id = Column(String, primary_key=True)
    collateral_packet_id = Column(String, ForeignKey('collateral_packets.id'), nullable=True)
    
    rail = Column(String, nullable=False)
    amount_usd = Column(Float, nullable=False)
    currency = Column(String, nullable=False)
    status = Column(String, nullable=False)
    
    created_at = Column(DateTime, nullable=False, default=datetime.utcnow)
    completed_at = Column(DateTime, nullable=True)
    
    tx_metadata = Column(JSON, nullable=True)
    description = Column(Text, nullable=True)
    customer_id = Column(String, nullable=True)
    invoice_id = Column(String, nullable=True)
    
    # Relationship
    collateral_packet = relationship("CollateralPacket", back_populates="transactions")


class RiskAssessment(Base):
    """Risk assessment database model."""
    __tablename__ = 'risk_assessments'
    
    id = Column(String, primary_key=True)
    collateral_packet_id = Column(String, ForeignKey('collateral_packets.id'), nullable=True)
    asset_id = Column(String, nullable=False, index=True)
    
    overall_risk_score = Column(Float, nullable=False)
    risk_level = Column(String, nullable=False)
    
    category_scores = Column(JSON, nullable=False)
    risk_factors = Column(JSON, nullable=False)
    mitigation_recommendations = Column(JSON, nullable=False)
    
    risk_adjusted_return = Column(Float, nullable=False)
    confidence_interval_lower = Column(Float, nullable=False)
    confidence_interval_upper = Column(Float, nullable=False)
    
    stress_test_results = Column(JSON, nullable=False)
    
    assessment_date = Column(DateTime, nullable=False, default=datetime.utcnow)
    
    # Relationship
    collateral_packet = relationship("CollateralPacket", back_populates="risk_assessment")


class DatabaseManager:
    """Database manager for all operations."""
    
    def __init__(self, database_url: Optional[str] = None):
        """
        Initialize database manager.
        
        Args:
            database_url: Database connection URL. If not provided, uses environment variable.
        """
        self.database_url = database_url or os.environ.get(
            'DATABASE_URL',
            'sqlite:///catacomb_underwriter.db'
        )
        
        self.engine = create_engine(self.database_url)
        self.SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=self.engine)
        
        # Create tables
        self.create_tables()
        
        logger.info(f"Database manager initialized with URL: {self.database_url}")
    
    def create_tables(self):
        """Create all database tables."""
        try:
            Base.metadata.create_all(bind=self.engine)
            logger.info("Database tables created successfully")
        except SQLAlchemyError as e:
            logger.error(f"Failed to create database tables: {e}")
            raise
    
    def get_session(self):
        """Get database session."""
        return self.SessionLocal()
    
    # Collateral Packet Operations
    def create_collateral_packet(self, packet_data: Dict[str, Any]) -> CollateralPacket:
        """Create a new collateral packet."""
        session = self.get_session()
        try:
            packet = CollateralPacket(
                id=packet_data['packet_id'],
                asset_id=packet_data['asset_id'],
                collateral_type=packet_data['collateral_type'],
                base_value_usd=packet_data['valuation']['base_value_usd'],
                collateral_value_usd=packet_data['valuation']['collateral_value_usd'],
                risk_adjusted_value_usd=packet_data['valuation']['risk_adjusted_value_usd'],
                collateral_multiplier=packet_data['valuation']['collateral_multiplier'],
                confidence_score=packet_data['valuation']['confidence_score'],
                valuation_method=packet_data['valuation']['valuation_method'],
                total_expected_annual_income_usd=packet_data['total_expected_annual_income_usd'],
                total_actual_annual_income_usd=packet_data['total_actual_annual_income_usd'],
                combined_multiplier=packet_data['combined_multiplier'],
                created_at=datetime.fromisoformat(packet_data['created_at']),
                expires_at=datetime.fromisoformat(packet_data['expires_at']) if packet_data.get('expires_at') else None,
                status=packet_data['status'],
            )
            
            # Add income streams
            for stream_data in packet_data.get('income_streams', []):
                stream = IncomeStream(
                    id=stream_data['stream_id'],
                    collateral_packet_id=packet.id,
                    source=stream_data['source'],
                    expected_annual_income_usd=stream_data['expected_annual_income_usd'],
                    actual_annual_income_usd=stream_data['actual_annual_income_usd'],
                    multiplier=stream_data['multiplier'],
                    start_date=datetime.fromisoformat(stream_data['start_date']),
                    end_date=datetime.fromisoformat(stream_data['end_date']) if stream_data.get('end_date') else None,
                    active=stream_data['active'],
                    payout_frequency='monthly',
                )
                packet.income_streams.append(stream)
            
            session.add(packet)
            session.commit()
            session.refresh(packet)
            
            logger.info(f"Created collateral packet: {packet.id}")
            return packet
        except SQLAlchemyError as e:
            session.rollback()
            logger.error(f"Failed to create collateral packet: {e}")
            raise
        finally:
            session.close()
    
    def get_collateral_packet(self, packet_id: str) -> Optional[CollateralPacket]:
        """Get collateral packet by ID."""
        session = self.get_session()
        try:
            packet = session.query(CollateralPacket).filter(
                CollateralPacket.id == packet_id
            ).first()
            return packet
        except SQLAlchemyError as e:
            logger.error(f"Failed to get collateral packet: {e}")
            raise
        finally:
            session.close()
    
    def list_collateral_packets(
        self,
        asset_id: Optional[str] = None,
        status: Optional[str] = None,
        limit: int = 100
    ) -> List[CollateralPacket]:
        """List collateral packets with optional filters."""
        session = self.get_session()
        try:
            query = session.query(CollateralPacket)
            
            if asset_id:
                query = query.filter(CollateralPacket.asset_id == asset_id)
            if status:
                query = query.filter(CollateralPacket.status == status)
            
            packets = query.limit(limit).all()
            return packets
        except SQLAlchemyError as e:
            logger.error(f"Failed to list collateral packets: {e}")
            raise
        finally:
            session.close()
    
    def update_collateral_packet(self, packet_id: str, updates: Dict[str, Any]) -> Optional[CollateralPacket]:
        """Update collateral packet."""
        session = self.get_session()
        try:
            packet = session.query(CollateralPacket).filter(
                CollateralPacket.id == packet_id
            ).first()
            
            if not packet:
                return None
            
            for key, value in updates.items():
                if hasattr(packet, key):
                    setattr(packet, key, value)
            
            session.commit()
            session.refresh(packet)
            
            logger.info(f"Updated collateral packet: {packet_id}")
            return packet
        except SQLAlchemyError as e:
            session.rollback()
            logger.error(f"Failed to update collateral packet: {e}")
            raise
        finally:
            session.close()
    
    def delete_collateral_packet(self, packet_id: str) -> bool:
        """Delete collateral packet."""
        session = self.get_session()
        try:
            packet = session.query(CollateralPacket).filter(
                CollateralPacket.id == packet_id
            ).first()
            
            if not packet:
                return False
            
            session.delete(packet)
            session.commit()
            
            logger.info(f"Deleted collateral packet: {packet_id}")
            return True
        except SQLAlchemyError as e:
            session.rollback()
            logger.error(f"Failed to delete collateral packet: {e}")
            raise
        finally:
            session.close()
    
    # Transaction Operations
    def create_transaction(self, transaction_data: Dict[str, Any]) -> Transaction:
        """Create a new transaction."""
        session = self.get_session()
        try:
            transaction = Transaction(
                id=transaction_data['transaction_id'],
                collateral_packet_id=transaction_data.get('collateral_packet_id'),
                rail=transaction_data['rail'],
                amount_usd=transaction_data['amount_usd'],
                currency=transaction_data['currency'],
                status=transaction_data['status'],
                created_at=datetime.fromisoformat(transaction_data['created_at']),
                completed_at=datetime.fromisoformat(transaction_data['completed_at']) if transaction_data.get('completed_at') else None,
                metadata=transaction_data.get('metadata'),
                description=transaction_data.get('description'),
                customer_id=transaction_data.get('customer_id'),
                invoice_id=transaction_data.get('invoice_id'),
            )
            
            session.add(transaction)
            session.commit()
            session.refresh(transaction)
            
            logger.info(f"Created transaction: {transaction.id}")
            return transaction
        except SQLAlchemyError as e:
            session.rollback()
            logger.error(f"Failed to create transaction: {e}")
            raise
        finally:
            session.close()
    
    def get_transaction(self, transaction_id: str) -> Optional[Transaction]:
        """Get transaction by ID."""
        session = self.get_session()
        try:
            transaction = session.query(Transaction).filter(
                Transaction.id == transaction_id
            ).first()
            return transaction
        except SQLAlchemyError as e:
            logger.error(f"Failed to get transaction: {e}")
            raise
        finally:
            session.close()
    
    def list_transactions(
        self,
        collateral_packet_id: Optional[str] = None,
        rail: Optional[str] = None,
        status: Optional[str] = None,
        limit: int = 100
    ) -> List[Transaction]:
        """List transactions with optional filters."""
        session = self.get_session()
        try:
            query = session.query(Transaction)
            
            if collateral_packet_id:
                query = query.filter(Transaction.collateral_packet_id == collateral_packet_id)
            if rail:
                query = query.filter(Transaction.rail == rail)
            if status:
                query = query.filter(Transaction.status == status)
            
            transactions = query.limit(limit).all()
            return transactions
        except SQLAlchemyError as e:
            logger.error(f"Failed to list transactions: {e}")
            raise
        finally:
            session.close()
    
    # Risk Assessment Operations
    def create_risk_assessment(self, assessment_data: Dict[str, Any]) -> RiskAssessment:
        """Create a new risk assessment."""
        session = self.get_session()
        try:
            assessment = RiskAssessment(
                id=f"risk_{assessment_data['asset_id']}_{datetime.utcnow().timestamp()}",
                collateral_packet_id=assessment_data.get('collateral_packet_id'),
                asset_id=assessment_data['asset_id'],
                overall_risk_score=assessment_data['overall_risk_score'],
                risk_level=assessment_data['risk_level'],
                category_scores=assessment_data['category_scores'],
                risk_factors=assessment_data['risk_factors'],
                mitigation_recommendations=assessment_data['mitigation_recommendations'],
                risk_adjusted_return=assessment_data['risk_adjusted_return'],
                confidence_interval_lower=assessment_data['confidence_interval']['lower'],
                confidence_interval_upper=assessment_data['confidence_interval']['upper'],
                stress_test_results=assessment_data['stress_test_results'],
                assessment_date=datetime.fromisoformat(assessment_data['assessment_date']),
            )
            
            session.add(assessment)
            session.commit()
            session.refresh(assessment)
            
            logger.info(f"Created risk assessment for asset: {assessment_data['asset_id']}")
            return assessment
        except SQLAlchemyError as e:
            session.rollback()
            logger.error(f"Failed to create risk assessment: {e}")
            raise
        finally:
            session.close()
    
    def get_risk_assessment(self, asset_id: str) -> Optional[RiskAssessment]:
        """Get risk assessment by asset ID."""
        session = self.get_session()
        try:
            assessment = session.query(RiskAssessment).filter(
                RiskAssessment.asset_id == asset_id
            ).order_by(RiskAssessment.assessment_date.desc()).first()
            return assessment
        except SQLAlchemyError as e:
            logger.error(f"Failed to get risk assessment: {e}")
            raise
        finally:
            session.close()
    
    # Income Recording Operations
    def record_income(
        self,
        packet_id: str,
        stream_id: str,
        amount_usd: float,
        timestamp: Optional[datetime] = None
    ) -> bool:
        """Record income for a stream."""
        session = self.get_session()
        try:
            # Get the income stream
            stream = session.query(IncomeStream).filter(
                IncomeStream.id == stream_id,
                IncomeStream.collateral_packet_id == packet_id
            ).first()
            
            if not stream:
                logger.error(f"Income stream not found: {stream_id}")
                return False
            
            # Update actual income
            stream.actual_annual_income_usd += amount_usd
            stream.last_payout_date = timestamp or datetime.utcnow()
            
            # Update packet total
            packet = session.query(CollateralPacket).filter(
                CollateralPacket.id == packet_id
            ).first()
            if packet:
                packet.total_actual_annual_income_usd += amount_usd
            
            session.commit()
            
            logger.info(f"Recorded ${amount_usd:,.2f} income for stream {stream_id}")
            return True
        except SQLAlchemyError as e:
            session.rollback()
            logger.error(f"Failed to record income: {e}")
            raise
        finally:
            session.close()
    
    def get_income_summary(self, packet_id: str) -> Dict[str, Any]:
        """Get income summary for a packet."""
        session = self.get_session()
        try:
            packet = session.query(CollateralPacket).filter(
                CollateralPacket.id == packet_id
            ).first()
            
            if not packet:
                return {
                    'total_income_usd': 0.0,
                    'transaction_count': 0,
                    'last_income_date': None,
                }
            
            # Get transactions for this packet
            transactions = session.query(Transaction).filter(
                Transaction.collateral_packet_id == packet_id,
                Transaction.status == 'completed'
            ).all()
            
            total_income = sum(t.amount_usd for t in transactions)
            last_date = max((t.completed_at for t in transactions if t.completed_at), default=None)
            
            return {
                'total_income_usd': round(total_income, 2),
                'transaction_count': len(transactions),
                'last_income_date': last_date.isoformat() if last_date else None,
            }
        except SQLAlchemyError as e:
            logger.error(f"Failed to get income summary: {e}")
            raise
        finally:
            session.close()


# Global database manager instance
db_manager: Optional[DatabaseManager] = None


def get_database_manager() -> DatabaseManager:
    """Get or create global database manager."""
    global db_manager
    if db_manager is None:
        db_manager = DatabaseManager()
    return db_manager