anya-core 1.2.0

use async_trait::async_trait;
use base64::{engine::general_purpose::STANDARD as BASE64, Engine as _};
use bitcoin::psbt::Psbt;
use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::fmt::Debug;
use std::str::FromStr;
use std::sync::Arc;
use tokio::sync::Mutex;
use tracing::warn;
use uuid::Uuid;

use crate::security::hsm::config::{
    CloudHsmConfig, HsmConfig, Pkcs11Config, SoftHsmConfig, TpmConfig,
};
use crate::security::hsm::error::HsmError;
use crate::security::hsm::providers::{
    HardwareHsmProvider, SimulatorHsmProvider, SoftwareHsmProvider,
};

/// Supported HSM provider types
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum HsmProviderType {
    /// Software HSM (for development and testing)
    SoftwareKeyStore,
    /// Cloud HSM (AWS, GCP, Azure)
    CloudHsm,
    /// Trusted Platform Module
    Tpm,
    /// PKCS#11 compliant HSM
    Pkcs11,
    /// Simulator HSM
    Simulator,
    /// Hardware HSM (YubiHSM, Ledger, etc.)
    Hardware,
    /// Bitcoin HSM
    Bitcoin,
    /// Custom HSM implementation
    Custom,
}

/// HSM provider status
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum HsmProviderStatus {
    /// Provider is ready
    Ready,
    /// Provider is initializing
    Initializing,
    /// Provider is unavailable
    Unavailable,
    /// Provider needs authentication
    NeedsAuthentication,
    /// Provider has an error
    Error(String),
}

/// Supported key types
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum KeyType {
    /// RSA key
    Rsa {
        /// Bits (e.g., 2048, 4096)
        bits: usize,
    },
    /// Elliptic curve key
    Ec {
        /// Curve (e.g., secp256k1, P-256)
        curve: EcCurve,
    },
    /// Ed25519 key
    Ed25519,
    /// X25519 key
    X25519,
    /// AES key
    Aes {
        /// Bits (e.g., 128, 256)
        bits: usize,
    },
    /// HMAC key
    Hmac {
        /// Bits
        bits: usize,
    },
    /// Raw key
    Raw {
        /// Bits
        bits: usize,
    },
}

/// Supported elliptic curves
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum EcCurve {
    /// secp256k1 (used by Bitcoin)
    Secp256k1,
    /// P-256 (NIST curve)
    P256,
    /// P-384 (NIST curve)
    P384,
    /// P-521 (NIST curve)
    P521,
}

impl FromStr for EcCurve {
    type Err = HsmError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s.to_lowercase().as_str() {
            "secp256k1" => Ok(EcCurve::Secp256k1),
            "p-256" | "p256" => Ok(EcCurve::P256),
            "p-384" | "p384" => Ok(EcCurve::P384),
            "p-521" | "p521" => Ok(EcCurve::P521),
            _ => Err(HsmError::InvalidParameters(format!(
                "Unsupported curve: {}",
                s
            ))),
        }
    }
}

/// Key usage
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum KeyUsage {
    /// Sign
    Sign,
    /// Verify
    Verify,
    /// Encrypt
    Encrypt,
    /// Decrypt
    Decrypt,
    /// Wrap
    Wrap,
    /// Unwrap
    Unwrap,
    /// Derive
    Derive,
}

/// Key information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct KeyInfo {
    /// Key ID
    pub id: String,
    /// Key label
    pub label: Option<String>,
    /// Key type
    pub key_type: KeyType,
    /// Whether the key is extractable
    pub extractable: bool,
    /// Key usages
    pub usages: Vec<KeyUsage>,
    /// Created at
    pub created_at: DateTime<Utc>,
    /// Expires at
    pub expires_at: Option<DateTime<Utc>>,
    /// Attributes
    pub attributes: HashMap<String, String>,
}

/// Key pair
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct KeyPair {
    /// Key ID
    pub id: String,
    /// Key type
    pub key_type: KeyType,
    /// Public key
    pub public_key: Vec<u8>,
    /// Private key handle (typically a reference to the key stored in the HSM)
    pub private_key_handle: String,
}

/// Key generation parameters
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct KeyGenParams {
    /// Key ID (optional, generated if not provided)
    pub id: Option<String>,
    /// Key label
    pub label: Option<String>,
    /// Key type
    pub key_type: KeyType,
    /// Whether the key is extractable
    pub extractable: bool,
    /// Key usages
    pub usages: Vec<KeyUsage>,
    /// Expires at
    pub expires_at: Option<DateTime<Utc>>,
    /// Attributes
    pub attributes: HashMap<String, String>,
}

/// Signing algorithm
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum SigningAlgorithm {
    /// RSA-PKCS1-v1_5 with SHA-256
    RsaPkcs1Sha256,
    /// RSA-PKCS1-v1_5 with SHA-384
    RsaPkcs1Sha384,
    /// RSA-PKCS1-v1_5 with SHA-512
    RsaPkcs1Sha512,
    /// RSA-PSS with SHA-256
    RsaPssSha256,
    /// RSA-PSS with SHA-384
    RsaPssSha384,
    /// RSA-PSS with SHA-512
    RsaPssSha512,
    /// ECDSA with SHA-256
    EcdsaSha256,
    /// ECDSA with SHA-384
    EcdsaSha384,
    /// ECDSA with SHA-512
    EcdsaSha512,
    /// Ed25519
    Ed25519,
    /// HMAC with SHA-256
    HmacSha256,
    /// HMAC with SHA-384
    HmacSha384,
    /// HMAC with SHA-512
    HmacSha512,
}

/// Encryption algorithm
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum EncryptionAlgorithm {
    /// RSA-PKCS1-v1_5
    RsaPkcs1,
    /// RSA-OAEP with SHA-256
    RsaOaepSha256,
    /// AES-GCM 128-bit
    AesGcm128,
    /// AES-GCM 256-bit
    AesGcm256,
    /// AES-CBC 128-bit
    AesCbc128,
    /// AES-CBC 256-bit
    AesCbc256,
    /// ChaCha20-Poly1305
    ChaCha20Poly1305,
}

/// HSM request operation
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum HsmOperation {
    /// Generate key
    GenerateKey,
    /// Sign
    Sign,
    /// Verify
    Verify,
    /// Encrypt
    Encrypt,
    /// Decrypt
    Decrypt,
    /// Export public key
    ExportPublicKey,
    /// List keys
    ListKeys,
    /// Get status
    GetStatus,
    /// Delete key
    DeleteKey,
    /// Custom operation
    Custom(String),
}

/// HSM request
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HsmRequest {
    /// Request ID
    pub id: String,
    /// Operation
    pub operation: HsmOperation,
    /// Parameters
    pub parameters: serde_json::Value,
}

/// HSM response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HsmResponse {
    /// Request ID
    pub id: String,
    /// Success
    pub success: bool,
    /// Error message
    pub error: Option<String>,
    /// Response data
    pub data: Option<serde_json::Value>,
}

impl HsmResponse {
    /// Create a success response
    pub fn success(id: String, data: Option<serde_json::Value>) -> Self {
        Self {
            id,
            success: true,
            error: None,
            data,
        }
    }

    /// Create an error response
    pub fn error(id: String, error: String) -> Self {
        Self {
            id,
            success: false,
            error: Some(error),
            data: None,
        }
    }
}

/// HSM provider trait
#[async_trait]
pub trait HsmProvider: Send + Sync + Debug {
    /// Initialize provider
    async fn initialize(&self) -> Result<(), HsmError>;

    /// Generate key
    async fn generate_key(&self, params: KeyGenParams) -> Result<(KeyPair, KeyInfo), HsmError>;

    /// Sign data
    async fn sign(
        &self,
        key_id: &str,
        algorithm: SigningAlgorithm,
        data: &[u8],
    ) -> Result<Vec<u8>, HsmError>;

    /// Verify signature
    async fn verify(
        &self,
        _key_id: &str,
        _algorithm: SigningAlgorithm,
        _data: &[u8],
        _signature: &[u8],
    ) -> Result<bool, HsmError> {
        Err(HsmError::UnsupportedOperation(
            "Verification not implemented".into(),
        ))
    }

    /// Sign PSBT (Partially Signed Bitcoin Transaction)
    async fn sign_psbt(&self, _psbt: &mut Psbt) -> Result<(), HsmError> {
        Err(HsmError::UnsupportedOperation(
            "PSBT signing not implemented".into(),
        ))
    }

    /// Export public key
    async fn export_public_key(&self, key_id: &str) -> Result<Vec<u8>, HsmError>;

    /// List keys
    async fn list_keys(&self) -> Result<Vec<KeyInfo>, HsmError>;

    /// Delete key
    async fn delete_key(&self, key_id: &str) -> Result<(), HsmError>;

    /// Get provider status
    async fn get_status(&self) -> Result<HsmProviderStatus, HsmError>;

    /// Close provider
    async fn close(&self) -> Result<(), HsmError>;

    /// Execute operation
    async fn execute_operation(&self, request: HsmRequest) -> Result<HsmResponse, HsmError>;

    /// Perform a comprehensive health check of the HSM
    /// Returns true if all checks pass, false otherwise
    async fn perform_health_check(&self) -> Result<bool, HsmError> {
        // Default implementation performs basic status check and key operation tests
        // Each provider should override this with more specific checks
        let _status = self.get_status().await?;

        // Generate a test key to verify key operations
        let test_params = KeyGenParams {
            id: Some(format!("health_check_{}", Utc::now().timestamp())),
            label: Some("health_check_test_key".to_string()),
            key_type: KeyType::Ec {
                curve: EcCurve::Secp256k1,
            },
            extractable: true,
            usages: vec![KeyUsage::Sign, KeyUsage::Verify],
            expires_at: None,
            attributes: HashMap::new(),
        };

        // Test key generation
        let (key_pair, _) = match self.generate_key(test_params).await {
            Ok(result) => result,
            Err(e) => {
                warn!("HSM health check failed: Key generation error: {}", e);
                return Ok(false);
            }
        };

        // Test signing
        let test_data = b"HSM health check test data";
        let signature = match self
            .sign(&key_pair.id, SigningAlgorithm::EcdsaSha256, test_data)
            .await
        {
            Ok(sig) => sig,
            Err(e) => {
                warn!("HSM health check failed: Signing error: {}", e);
                // Try to clean up test key before returning
                let _ = self.delete_key(&key_pair.id).await;
                return Ok(false);
            }
        };

        // Test verification
        let verify_result = match self
            .verify(
                &key_pair.id,
                SigningAlgorithm::EcdsaSha256,
                test_data,
                &signature,
            )
            .await
        {
            Ok(result) => result,
            Err(e) => {
                warn!("HSM health check failed: Verification error: {}", e);
                // Try to clean up test key before returning
                let _ = self.delete_key(&key_pair.id).await;
                return Ok(false);
            }
        };

        // Clean up test key
        match self.delete_key(&key_pair.id).await {
            Ok(_) => {}
            Err(e) => {
                warn!("HSM health check warning: Could not delete test key: {}", e);
                // Non-fatal error, don't fail the health check just for this
            }
        };

        // All checks should pass and verification should succeed
        Ok(verify_result)
    }
}

/// Creates an HSM provider based on the configuration
pub async fn create_hsm_provider(config: &HsmConfig) -> Result<Arc<dyn HsmProvider>, HsmError> {
    match config.provider_type {
        HsmProviderType::SoftwareKeyStore => {
            // Import the SoftwareHsmProvider from providers/software.rs
            // Create a dummy audit logger for now - this function signature needs updating
            let audit_config = crate::security::hsm::audit::AuditLoggerConfig::default();
            let audit_logger =
                Arc::new(crate::security::hsm::audit::AuditLogger::new(&audit_config).await?);
            let provider = SoftwareHsmProvider::new(
                config.software.clone(),
                bitcoin::Network::from(config.bitcoin.network),
                audit_logger,
            )
            .await?;
            Ok(Arc::new(provider))
        }
        HsmProviderType::CloudHsm => {
            // Not implemented for this phase
            Err(HsmError::ProviderError(
                "CloudHsm provider not implemented".to_string(),
            ))
        }
        HsmProviderType::Tpm => {
            // Not implemented for this phase
            Err(HsmError::ProviderError(
                "Tpm provider not implemented".to_string(),
            ))
        }
        HsmProviderType::Pkcs11 => {
            // Not implemented for this phase
            Err(HsmError::ProviderError(
                "Pkcs11 provider not implemented".to_string(),
            ))
        }
        HsmProviderType::Simulator => {
            // Import the SimulatorHsmProvider from providers/simulator.rs
            let provider = SimulatorHsmProvider::new(&config.simulator)?;
            Ok(Arc::new(provider))
        }
        HsmProviderType::Hardware => {
            // Import the HardwareHsmProvider from providers/hardware.rs
            // Create a dummy audit logger for now - this function signature needs updating
            let audit_config = crate::security::hsm::audit::AuditLoggerConfig::default();
            let audit_logger =
                Arc::new(crate::security::hsm::audit::AuditLogger::new(&audit_config).await?);
            let provider = HardwareHsmProvider::new(
                &config.hardware,
                bitcoin::Network::from(config.bitcoin.network),
                audit_logger,
            )
            .await?;
            Ok(Arc::new(provider))
        }
        HsmProviderType::Bitcoin => {
            // This would be Bitcoin-specific HSM implementation
            // For now, we'll recommend using the Hardware provider with Bitcoin config
            Err(HsmError::ProviderError(
                "Use Hardware provider with Bitcoin configuration".to_string(),
            ))
        }
        HsmProviderType::Custom => Err(HsmError::ProviderError(
            "Custom provider requires implementation".to_string(),
        )),
    }
}

/// SoftHSM provider
///
/// This provider is used for development and testing purposes only.
#[derive(Debug)]
pub struct SoftHsmProvider {
    keys: Mutex<HashMap<String, KeyInfo>>,
    key_data: Mutex<HashMap<String, Vec<u8>>>, // For private key data (in a real HSM, this would never be exposed)
}

impl SoftHsmProvider {
    /// Create a new SoftHSM provider
    pub fn new(_config: &SoftHsmConfig) -> Result<Self, HsmError> {
        Ok(Self {
            keys: Mutex::new(HashMap::new()),
            key_data: Mutex::new(HashMap::new()),
        })
    }
}

#[async_trait]
impl HsmProvider for SoftHsmProvider {
    async fn initialize(&self) -> Result<(), HsmError> {
        // In a real implementation, this would initialize the SoftHSM library
        Ok(())
    }

    async fn generate_key(&self, _params: KeyGenParams) -> Result<(KeyPair, KeyInfo), HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn sign(
        &self,
        _key_id: &str,
        _algorithm: SigningAlgorithm,
        _data: &[u8],
    ) -> Result<Vec<u8>, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn verify(
        &self,
        _key_id: &str,
        _algorithm: SigningAlgorithm,
        _data: &[u8],
        _signature: &[u8],
    ) -> Result<bool, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn export_public_key(&self, _key_id: &str) -> Result<Vec<u8>, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn list_keys(&self) -> Result<Vec<KeyInfo>, HsmError> {
        let keys = self.keys.lock().await;
        Ok(keys.values().cloned().collect())
    }

    async fn delete_key(&self, key_id: &str) -> Result<(), HsmError> {
        let mut keys = self.keys.lock().await;
        let mut key_data = self.key_data.lock().await;

        if !keys.contains_key(key_id) {
            return Err(HsmError::KeyNotFound(key_id.to_string()));
        }

        keys.remove(key_id);
        key_data.remove(key_id);

        Ok(())
    }

    async fn get_status(&self) -> Result<HsmProviderStatus, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn close(&self) -> Result<(), HsmError> {
        // In a real implementation, this would close the SoftHSM library
        Ok(())
    }

    async fn execute_operation(&self, request: HsmRequest) -> Result<HsmResponse, HsmError> {
        // Log the operation
        tracing::debug!("Executing operation: {:?}", request.operation);

        // Execute the operation based on the type
        match request.operation {
            HsmOperation::GenerateKey => {
                // Parse the parameters
                let params: KeyGenParams = serde_json::from_value(request.parameters.clone())
                    .map_err(|e| {
                        HsmError::InvalidParameters(format!("Invalid parameters: {}", e))
                    })?;

                // Generate the key
                let key_id = params.id.unwrap_or_else(|| Uuid::new_v4().to_string());
                let created_at = chrono::Utc::now();

                // Create the key info
                let key_info = KeyInfo {
                    id: key_id.clone(),
                    label: params.label.clone(),
                    key_type: params.key_type.clone(),
                    extractable: params.extractable,
                    usages: params.usages.clone(),
                    created_at,
                    expires_at: params.expires_at,
                    attributes: params.attributes.clone(),
                };

                // In a real implementation, this would generate actual key material
                let key_data = vec![0u8; 32]; // Dummy key data

                // Store the key
                let mut keys = self.keys.lock().await;
                let mut key_data_map = self.key_data.lock().await;

                keys.insert(key_id.clone(), key_info.clone());
                key_data_map.insert(key_id.clone(), key_data);

                // Return the response
                let response_data = serde_json::to_value(key_info).map_err(|e| {
                    HsmError::SerializationError(format!("Failed to serialize key info: {}", e))
                })?;

                Ok(HsmResponse::success(request.id, Some(response_data)))
            }
            HsmOperation::Sign => {
                // Parse the parameters
                let key_id: String = match request.parameters.get("key_id") {
                    Some(value) if value.is_string() => value
                        .as_str()
                        .ok_or_else(|| {
                            HsmError::InvalidParameters("key_id is not a valid string".to_string())
                        })?
                        .to_string(),
                    _ => {
                        return Err(HsmError::InvalidParameters(
                            "Missing or invalid key_id parameter".to_string(),
                        ))
                    }
                };

                let data_base64: String = match request.parameters.get("data") {
                    Some(value) if value.is_string() => value
                        .as_str()
                        .ok_or_else(|| {
                            HsmError::InvalidParameters("data is not a valid string".to_string())
                        })?
                        .to_string(),
                    _ => {
                        return Err(HsmError::InvalidParameters(
                            "Missing or invalid data parameter".to_string(),
                        ))
                    }
                };

                // Decode the data
                let _data = BASE64.decode(&data_base64).map_err(|e| {
                    HsmError::InvalidParameters(format!("Invalid base64 data: {}", e))
                })?;

                // Check if the key exists
                let keys = self.keys.lock().await;
                let _key_data_map = self.key_data.lock().await;

                if !keys.contains_key(&key_id) {
                    return Err(HsmError::KeyNotFound(key_id));
                }

                // In a real implementation, this would use the key to sign the data
                // For now, we'll just return a dummy signature
                let signature = vec![0u8; 64]; // Dummy signature

                // Return the response
                let response_data = serde_json::json!({
                    "signature": BASE64.encode(&signature),
                });

                Ok(HsmResponse::success(request.id, Some(response_data)))
            }
            HsmOperation::Verify => {
                // Similar to sign, but would verify the signature
                // For brevity, returning a dummy response
                let response_data = serde_json::json!({
                    "verified": true,
                });

                Ok(HsmResponse::success(request.id, Some(response_data)))
            }
            HsmOperation::Encrypt => {
                // Similar to sign, but would encrypt the data
                // For brevity, returning a dummy response
                let response_data = serde_json::json!({
                    "encrypted_data": "dGhpcyBpcyBhIGR1bW15IGVuY3J5cHRlZCB2YWx1ZQ==", // base64 encoded dummy data
                });

                Ok(HsmResponse::success(request.id, Some(response_data)))
            }
            HsmOperation::Decrypt => {
                // Similar to sign, but would decrypt the data
                // For brevity, returning a dummy response
                let response_data = serde_json::json!({
                    "decrypted_data": "dGhpcyBpcyBhIGR1bW15IGRlY3J5cHRlZCB2YWx1ZQ==", // base64 encoded dummy data
                });

                Ok(HsmResponse::success(request.id, Some(response_data)))
            }
            HsmOperation::ExportPublicKey => {
                // Parse the parameters
                let key_id: String = match request.parameters.get("key_id") {
                    Some(value) if value.is_string() => value
                        .as_str()
                        .ok_or(HsmError::InvalidParameters(
                            "Invalid string value".to_string(),
                        ))?
                        .to_string(),
                    _ => {
                        return Err(HsmError::InvalidParameters(
                            "Missing or invalid key_id parameter".to_string(),
                        ))
                    }
                };

                // Check if the key exists
                let keys = self.keys.lock().await;

                if !keys.contains_key(&key_id) {
                    return Err(HsmError::KeyNotFound(key_id));
                }

                // In a real implementation, this would export the public key
                // For now, we'll just return a dummy public key
                let public_key = vec![0u8; 65]; // Dummy public key

                // Return the response
                let response_data = serde_json::json!({
                    "public_key": BASE64.encode(&public_key),
                });

                Ok(HsmResponse::success(request.id, Some(response_data)))
            }
            HsmOperation::ListKeys => {
                let keys = self.keys.lock().await;
                let key_list: Vec<KeyInfo> = keys.values().cloned().collect();

                // Return the response
                let response_data = serde_json::to_value(key_list).map_err(|e| {
                    HsmError::SerializationError(format!("Failed to serialize key list: {}", e))
                })?;

                Ok(HsmResponse::success(request.id, Some(response_data)))
            }
            HsmOperation::DeleteKey => {
                // Parse the parameters
                let key_id: String = match request.parameters.get("key_id") {
                    Some(value) if value.is_string() => value
                        .as_str()
                        .ok_or(HsmError::InvalidParameters(
                            "Invalid string value".to_string(),
                        ))?
                        .to_string(),
                    _ => {
                        return Err(HsmError::InvalidParameters(
                            "Missing or invalid key_id parameter".to_string(),
                        ))
                    }
                };

                // Delete the key
                let mut keys = self.keys.lock().await;
                let mut key_data_map = self.key_data.lock().await;

                if !keys.contains_key(&key_id) {
                    return Err(HsmError::KeyNotFound(key_id));
                }

                keys.remove(&key_id);
                key_data_map.remove(&key_id);

                // Return the response
                Ok(HsmResponse::success(request.id, None))
            }
            HsmOperation::GetStatus => {
                // Return the current status
                let status = HsmProviderStatus::Ready;

                let response_data = serde_json::to_value(status).map_err(|e| {
                    HsmError::SerializationError(format!("Failed to serialize status: {}", e))
                })?;

                Ok(HsmResponse::success(request.id, Some(response_data)))
            }
            HsmOperation::Custom(op) => {
                // Handle custom operations
                Err(HsmError::OperationNotSupported(format!(
                    "Custom operation not supported: {}",
                    op
                )))
            }
        }
    }
}

/// CloudHSM provider
#[derive(Debug)]
pub struct CloudHsmProvider;

impl CloudHsmProvider {
    /// Create a new CloudHSM provider
    pub fn new(_config: &CloudHsmConfig) -> Result<Self, HsmError> {
        Ok(Self)
    }
}

#[async_trait]
impl HsmProvider for CloudHsmProvider {
    async fn initialize(&self) -> Result<(), HsmError> {
        // In a real implementation, this would initialize the CloudHSM client
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn generate_key(&self, _params: KeyGenParams) -> Result<(KeyPair, KeyInfo), HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn sign(
        &self,
        _key_id: &str,
        _algorithm: SigningAlgorithm,
        _data: &[u8],
    ) -> Result<Vec<u8>, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn verify(
        &self,
        _key_id: &str,
        _algorithm: SigningAlgorithm,
        _data: &[u8],
        _signature: &[u8],
    ) -> Result<bool, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn export_public_key(&self, _key_id: &str) -> Result<Vec<u8>, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn list_keys(&self) -> Result<Vec<KeyInfo>, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn delete_key(&self, _key_id: &str) -> Result<(), HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn get_status(&self) -> Result<HsmProviderStatus, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn close(&self) -> Result<(), HsmError> {
        // In a real implementation, this would close the CloudHSM client
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn execute_operation(&self, _request: HsmRequest) -> Result<HsmResponse, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }
}

/// TPM provider
#[derive(Debug)]
pub struct TpmProvider;

impl TpmProvider {
    /// Create a new TPM provider
    pub fn new(_config: &TpmConfig) -> Result<Self, HsmError> {
        Ok(Self)
    }
}

#[async_trait]
impl HsmProvider for TpmProvider {
    async fn initialize(&self) -> Result<(), HsmError> {
        // In a real implementation, this would initialize the TPM client
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn generate_key(&self, _params: KeyGenParams) -> Result<(KeyPair, KeyInfo), HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn sign(
        &self,
        _key_id: &str,
        _algorithm: SigningAlgorithm,
        _data: &[u8],
    ) -> Result<Vec<u8>, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn verify(
        &self,
        _key_id: &str,
        _algorithm: SigningAlgorithm,
        _data: &[u8],
        _signature: &[u8],
    ) -> Result<bool, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn export_public_key(&self, _key_id: &str) -> Result<Vec<u8>, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn list_keys(&self) -> Result<Vec<KeyInfo>, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn delete_key(&self, _key_id: &str) -> Result<(), HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn get_status(&self) -> Result<HsmProviderStatus, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn close(&self) -> Result<(), HsmError> {
        // In a real implementation, this would close the TPM client
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn execute_operation(&self, _request: HsmRequest) -> Result<HsmResponse, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }
}

/// PKCS#11 provider
#[derive(Debug)]
pub struct Pkcs11Provider;

impl Pkcs11Provider {
    /// Create a new PKCS#11 provider
    pub fn new(_config: &Pkcs11Config) -> Result<Self, HsmError> {
        Ok(Self)
    }
}

#[async_trait]
impl HsmProvider for Pkcs11Provider {
    async fn initialize(&self) -> Result<(), HsmError> {
        // In a real implementation, this would initialize the PKCS#11 library
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn generate_key(&self, _params: KeyGenParams) -> Result<(KeyPair, KeyInfo), HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn sign(
        &self,
        _key_id: &str,
        _algorithm: SigningAlgorithm,
        _data: &[u8],
    ) -> Result<Vec<u8>, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn verify(
        &self,
        _key_id: &str,
        _algorithm: SigningAlgorithm,
        _data: &[u8],
        _signature: &[u8],
    ) -> Result<bool, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn export_public_key(&self, _key_id: &str) -> Result<Vec<u8>, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn list_keys(&self) -> Result<Vec<KeyInfo>, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn delete_key(&self, _key_id: &str) -> Result<(), HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn get_status(&self) -> Result<HsmProviderStatus, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn close(&self) -> Result<(), HsmError> {
        // In a real implementation, this would close the PKCS#11 library
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }

    async fn execute_operation(&self, _request: HsmRequest) -> Result<HsmResponse, HsmError> {
        // Implementation needed
        Err(HsmError::UnsupportedOperation(
            "Not implemented".to_string(),
        ))
    }
}