"""
Recovery management for point-in-time restoration and rollback.
"""

import logging
from dataclasses import dataclass, field
from datetime import datetime
from typing import Dict, List, Any, Optional

logger = logging.getLogger(__name__)


@dataclass
class RecoveryPoint:
    """Represents a recovery point for state restoration."""
    checkpoint_name: str
    timestamp: str
    state: Dict[str, Any]
    malformed_records: List[Dict[str, Any]] = field(default_factory=list)


class RecoveryManager:
    """Manages recovery points and point-in-time restoration."""

    def __init__(self):
        """Initialize the recovery manager."""
        self.recovery_points: Dict[str, RecoveryPoint] = {}

    def create_recovery_point(
        self,
        checkpoint_name: str,
        state: Dict[str, Any],
        malformed_records: List[Any] = None
    ) -> RecoveryPoint:
        """
        Create recovery point before deletion.

        Args:
            checkpoint_name: Name of the checkpoint
            state: Current state to save
            malformed_records: List of malformed records

        Returns:
            RecoveryPoint instance
        """
        records_data = []
        if malformed_records:
            records_data = [
                {
                    "id": m.record_id,
                    "type": m.entity_type,
                    "reasons": m.reasons,
                    "checksum": m.checksum
                }
                for m in malformed_records
            ]

        recovery_point = RecoveryPoint(
            checkpoint_name=checkpoint_name,
            timestamp=datetime.utcnow().isoformat(),
            state=state,
            malformed_records=records_data
        )

        self.recovery_points[checkpoint_name] = recovery_point

        logger.info("Recovery point created: %s", checkpoint_name)

        return recovery_point

    def restore_from_recovery_point(
        self,
        checkpoint_name: str
    ) -> Optional[Dict[str, Any]]:
        """
        Restore from recovery point.

        Args:
            checkpoint_name: Name of checkpoint to restore

        Returns:
            Restored state or None if checkpoint not found
        """
        if checkpoint_name not in self.recovery_points:
            logger.error("Recovery point not found: %s", checkpoint_name)
            return None

        recovery_point = self.recovery_points[checkpoint_name]

        logger.info("Restored from checkpoint: %s", checkpoint_name)

        return {
            "checkpoint": checkpoint_name,
            "timestamp": recovery_point.timestamp,
            "state": recovery_point.state,
            "malformed_records": recovery_point.malformed_records
        }

    def list_recovery_points(self) -> List[str]:
        """Get list of available recovery points."""
        return list(self.recovery_points.keys())

    def get_recovery_point(
        self,
        checkpoint_name: str
    ) -> Optional[RecoveryPoint]:
        """Get a specific recovery point."""
        return self.recovery_points.get(checkpoint_name)

    def delete_recovery_point(self, checkpoint_name: str) -> bool:
        """
        Delete a recovery point.

        Args:
            checkpoint_name: Name of checkpoint to delete

        Returns:
            True if deleted, False if not found
        """
        if checkpoint_name in self.recovery_points:
            del self.recovery_points[checkpoint_name]
            logger.info("Recovery point deleted: %s", checkpoint_name)
            return True

        logger.warning("Recovery point not found for deletion: %s",
                      checkpoint_name)
        return False

