"""Secrets manager service with automatic rotation support."""

import asyncio
import json
import logging
import os
from datetime import datetime, timedelta
from typing import Any, Dict, Optional

import boto3
import hvac
from cryptography.fernet import Fernet

logger = logging.getLogger(__name__)


class SecretsManager:
    """Secrets manager with automatic rotation support."""

    def __init__(self, backend: str = "vault"):
        """Initialize secrets manager.

        Args:
            backend: Secrets backend to use (vault, aws, or local)
        """
        self.backend = backend
        self.rotation_interval = timedelta(days=30)
        self.last_rotation = {}

        if backend == "vault":
            self.client = hvac.Client(
                url=os.getenv("VAULT_URL", "http://localhost:8200"),
                token=os.getenv("VAULT_TOKEN"),
            )
        elif backend == "aws":
            self.client = boto3.client(
                "secretsmanager", region_name=os.getenv("AWS_REGION", "us-east-1")
            )
        else:
            # Local development with encryption
            self.key = Fernet.generate_key()
            self.cipher_suite = Fernet(self.key)
            self.secrets = {}

    async def get_secret(self, secret_id: str) -> Optional[Dict[str, Any]]:
        """Get a secret value.

        Args:
            secret_id: Secret identifier

        Returns:
            Optional[Dict[str, Any]]: Secret value if found, None otherwise
        """
        try:
            if self.backend == "vault":
                response = self.client.secrets.kv.v2.read_secret_version(path=secret_id)
                return response["data"]["data"]
            elif self.backend == "aws":
                response = self.client.get_secret_value(SecretId=secret_id)
                return json.loads(response["SecretString"])
            else:
                encrypted = self.secrets.get(secret_id)
                if encrypted:
                    decrypted = self.cipher_suite.decrypt(encrypted)
                    return json.loads(decrypted)
                return None

        except Exception as e:
            logger.error(f"Error getting secret {secret_id}: {e}")
            return None

    async def set_secret(self, secret_id: str, value: Dict[str, Any]) -> bool:
        """Set a secret value.

        Args:
            secret_id: Secret identifier
            value: Secret value to store

        Returns:
            bool: True if successful, False otherwise
        """
        try:
            if self.backend == "vault":
                self.client.secrets.kv.v2.create_or_update_secret(
                    path=secret_id, secret=value
                )
            elif self.backend == "aws":
                self.client.create_secret(
                    Name=secret_id, SecretString=json.dumps(value)
                )
            else:
                encrypted = self.cipher_suite.encrypt(json.dumps(value).encode())
                self.secrets[secret_id] = encrypted

            self.last_rotation[secret_id] = datetime.now()
            return True

        except Exception as e:
            logger.error(f"Error setting secret {secret_id}: {e}")
            return False

    async def rotate_secret(self, secret_id: str) -> bool:
        """Rotate a secret value.

        Args:
            secret_id: Secret identifier

        Returns:
            bool: True if successful, False otherwise
        """
        try:
            current = await self.get_secret(secret_id)
            if not current:
                return False

            # Generate new secret value
            new_value = self._generate_new_secret(current)

            # Store new value
            success = await self.set_secret(secret_id, new_value)
            if success:
                logger.info(f"Successfully rotated secret {secret_id}")
                return True
            return False

        except Exception as e:
            logger.error(f"Error rotating secret {secret_id}: {e}")
            return False

    async def check_rotation(self) -> None:
        """Check and rotate secrets that need rotation."""
        now = datetime.now()
        for secret_id, last_rotation in self.last_rotation.items():
            if now - last_rotation >= self.rotation_interval:
                await self.rotate_secret(secret_id)

    def _generate_new_secret(self, current: Dict[str, Any]) -> Dict[str, Any]:
        """Generate a new secret value based on current value.

        Args:
            current: Current secret value

        Returns:
            Dict[str, Any]: New secret value
        """
        # Implement secret generation logic based on your requirements
        # This is a placeholder implementation
        new_value = current.copy()
        for key in new_value:
            if isinstance(new_value[key], str):
                # Add timestamp to string values
                new_value[key] = f"{new_value[key]}_{datetime.now().timestamp()}"
        return new_value

    async def start_rotation_scheduler(self) -> None:
        """Start the automatic rotation scheduler."""
        while True:
            await self.check_rotation()
            await asyncio.sleep(3600)  # Check every hour
