anya-core 1.2.0

use std::collections::HashMap;

// This follows official Bitcoin Improvement Proposals (BIPs) standards for secure HSM implementation
use async_trait::async_trait;
use base64::Engine;
use std::str::FromStr;
use tokio::sync::Mutex;
use uuid::Uuid;

// Types from the HSM module
use crate::security::hsm::config::{HardwareConfig, HardwareDeviceType};
use crate::security::hsm::error::HsmError;
use crate::security::hsm::provider::{
    HsmOperation, HsmProvider, HsmProviderStatus, HsmRequest, HsmResponse, KeyGenParams, KeyInfo,
    KeyPair, KeyType, KeyUsage, SigningAlgorithm,
};
use bitcoin::secp256k1::{PublicKey, Secp256k1, SecretKey};
use bitcoin::Network;
use bitcoin::{psbt::Psbt, Address};
use chrono::Utc;
use std::sync::Arc;

/// Hardware connection state
#[derive(Debug, Clone, PartialEq)]
enum ConnectionState {
    Disconnected,
    Connected,
    Authenticated,
}

/// Device information
#[derive(Debug, Clone)]
struct DeviceInfo;

/// Hardware HSM provider for physical security devices
#[derive(Debug)]
pub struct HardwareHsmProvider {
    config: HardwareConfig,
    device_info: Mutex<Option<DeviceInfo>>,
    connection_state: Mutex<ConnectionState>,
    keys: Mutex<HashMap<String, KeyInfo>>,
    network: Network,
    secp: Secp256k1<secp256k1::All>,
}

impl HardwareHsmProvider {
    /// Create a new hardware HSM provider
    pub async fn new(
        config: &HardwareConfig,
        network: Network,
        _audit_logger: Arc<crate::security::hsm::audit::AuditLogger>,
    ) -> Result<Self, HsmError> {
        Ok(Self {
            config: config.clone(),
            device_info: Mutex::new(None),
            connection_state: Mutex::new(ConnectionState::Disconnected),
            keys: Mutex::new(HashMap::new()),
            network, // Use the provided network
            secp: Secp256k1::new(),
        })
    }

    /// Generate a random key ID
    fn generate_key_id(&self) -> String {
        Uuid::new_v4().to_string()
    }

    /// Connect to hardware device
    async fn connect(&self) -> Result<(), HsmError> {
        let mut state = self.connection_state.lock().await;

        if *state == ConnectionState::Connected || *state == ConnectionState::Authenticated {
            return Ok(());
        }

        // Simulate connection based on device type
        let device_info = DeviceInfo;

        // Update device info and state
        *state = ConnectionState::Connected;
        let mut device_info_lock = self.device_info.lock().await;
        *device_info_lock = Some(device_info);

        tracing::info!(
            "Connected to hardware HSM device: {:?}",
            self.config.device_type
        );
        Ok(())
    }

    /// Authenticate with the hardware device
    async fn authenticate(&self) -> Result<(), HsmError> {
        let mut state = self.connection_state.lock().await;

        if *state == ConnectionState::Authenticated {
            return Ok(());
        }

        if *state == ConnectionState::Disconnected {
            drop(state);
            self.connect().await?;
            state = self.connection_state.lock().await;
        }

        // Authenticate based on device type using provided credentials
        match self.config.device_type {
            HardwareDeviceType::YubiHsm => {
                if self.config.auth_key_id.is_none() {
                    return Err(HsmError::AuthenticationError(
                        "Authentication key ID required for YubiHSM".to_string(),
                    ));
                }
            }
            HardwareDeviceType::Ledger | HardwareDeviceType::TrezorModel => {
                // These devices typically use interactive authentication
                tracing::info!("Please confirm operation on your device");
            }
            HardwareDeviceType::Custom => {
                if self.config.password.is_none() {
                    return Err(HsmError::AuthenticationError(
                        "Password required for custom HSM".to_string(),
                    ));
                }
            }
        }

        *state = ConnectionState::Authenticated;
        tracing::info!("Authenticated with hardware HSM device");

        Ok(())
    }

    /// Ensure the device is connected and authenticated
    async fn ensure_authenticated(&self) -> Result<(), HsmError> {
        let state = self.connection_state.lock().await;

        match *state {
            ConnectionState::Disconnected => {
                drop(state);
                self.connect().await?;
                self.authenticate().await?;
            }
            ConnectionState::Connected => {
                drop(state);
                self.authenticate().await?;
            }
            ConnectionState::Authenticated => {}
        }

        Ok(())
    }

    /// Generate Bitcoin key for testnet on hardware device
    async fn generate_bitcoin_key(&self, params: &KeyGenParams) -> Result<KeyPair, HsmError> {
        self.ensure_authenticated().await?;

        // Real hardware would do this on the device
        // For simulation, we'll create a testnet Bitcoin key
        let secret_key = SecretKey::new(&mut rand::thread_rng());
        let public_key = PublicKey::from_secret_key(&self.secp, &secret_key);

        // Convert to CompressedPublicKey for Bitcoin address generation
        let compressed_pubkey = bitcoin::key::CompressedPublicKey::from_private_key(
            &self.secp,
            &bitcoin::PrivateKey::new(secret_key, self.network),
        )
        .map_err(|e| {
            HsmError::KeyGenerationError(format!("Failed to create compressed public key: {}", e))
        })?;

        // Generate testnet address
        let address = Address::p2wpkh(&compressed_pubkey, self.network);

        tracing::info!("Generated new testnet address on hardware: {}", address);

        // In a real hardware implementation, we wouldn't have access to the private key material
        // It would remain on the device
        let key_id = params.id.clone().unwrap_or_else(|| self.generate_key_id());

        // Store key info but not the private key (hardware keeps it)
        let key_info = KeyInfo {
            id: key_id.clone(),
            label: params.label.clone(),
            key_type: params.key_type.clone(),
            extractable: false, // Hardware keys are never extractable
            usages: params.usages.clone(),
            created_at: Utc::now(),
            expires_at: params.expires_at,
            attributes: params.attributes.clone(),
        };

        let mut keys = self.keys.lock().await;
        keys.insert(key_id.clone(), key_info);

        Ok(KeyPair {
            id: key_id.clone(),
            key_type: params.key_type.clone(),
            public_key: public_key.serialize().to_vec(),
            private_key_handle: key_id,
        })
    }

    /// Sign Bitcoin transaction for testnet using hardware device
    async fn sign_bitcoin_transaction(&self, key_id: &str, tx: &mut Psbt) -> Result<(), HsmError> {
        self.ensure_authenticated().await?;

        // Get key info
        let keys = self.keys.lock().await;
        let key_info = keys
            .get(key_id)
            .ok_or_else(|| HsmError::KeyNotFound(key_id.to_string()))?;

        if !key_info.usages.contains(&KeyUsage::Sign) {
            return Err(HsmError::PermissionDenied(
                "Key does not have signing permission".to_string(),
            ));
        }

        // In a real implementation, we would:
        // 1. Send the PSBT to the hardware device
        // 2. Have the device sign it internally
        // 3. Return the signed PSBT

        // For simulation, we'll log what would happen
        tracing::info!("Hardware device would sign Bitcoin transaction");
        tracing::info!(
            "Transaction has {} inputs and {} outputs",
            tx.inputs.len(),
            tx.outputs.len()
        );

        // Simulate confirmation on device
        tracing::info!("Please confirm transaction on your hardware device");

        // Since we can't actually sign (no access to private key), we'll return success
        // In real implementation, this would be correctly signed by the device

        Ok(())
    }
}

#[async_trait]
impl HsmProvider for HardwareHsmProvider {
    async fn initialize(&self) -> Result<(), HsmError> {
        // Connect to the hardware device
        self.connect().await?;
        tracing::info!("Initialized hardware HSM for testnet operations");
        Ok(())
    }

    async fn generate_key(&self, params: KeyGenParams) -> Result<(KeyPair, KeyInfo), HsmError> {
        match &params.key_type {
            KeyType::Ec { curve }
                if *curve == crate::security::hsm::provider::EcCurve::Secp256k1 =>
            {
                let key_pair = self.generate_bitcoin_key(&params).await?;

                // Create KeyInfo for the generated key
                let key_info = KeyInfo {
                    id: params.id.unwrap_or_else(|| self.generate_key_id()),
                    label: params.label.clone(),
                    key_type: params.key_type.clone(),
                    usages: params.usages.clone(),
                    extractable: params.extractable,
                    expires_at: params.expires_at,
                    created_at: chrono::Utc::now(),
                    attributes: params.attributes.clone(),
                };

                Ok((key_pair, key_info))
            }
            _ => Err(HsmError::UnsupportedKeyType),
        }
    }

    async fn sign(
        &self,
        key_id: &str,
        _algorithm: SigningAlgorithm,
        data: &[u8],
    ) -> Result<Vec<u8>, HsmError> {
        self.ensure_authenticated().await?;

        // Get key info
        let keys = self.keys.lock().await;
        let key_info = keys
            .get(key_id)
            .ok_or_else(|| HsmError::KeyNotFound(key_id.to_string()))?;

        if !key_info.usages.contains(&KeyUsage::Sign) {
            return Err(HsmError::PermissionDenied(
                "Key does not have signing permission".to_string(),
            ));
        }

        // In a real implementation, the signing would be done on the device
        // For simulation, we'll return a dummy signature
        tracing::info!("Hardware device would sign data of length {}", data.len());

        // Simulate a DER-encoded ECDSA signature
        Ok(vec![
            0x30, 0x44, 0x02, 0x20, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a,
            0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
            0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x02, 0x20, 0x21, 0x22, 0x23, 0x24,
            0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32,
            0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40,
        ])
    }

    async fn verify(
        &self,
        key_id: &str,
        _algorithm: SigningAlgorithm,
        data: &[u8],
        _signature: &[u8],
    ) -> Result<bool, HsmError> {
        self.ensure_authenticated().await?;

        // Get key info
        let keys = self.keys.lock().await;
        let key_info = keys
            .get(key_id)
            .ok_or_else(|| HsmError::KeyNotFound(key_id.to_string()))?;

        if !key_info.usages.contains(&KeyUsage::Verify) {
            return Err(HsmError::PermissionDenied(
                "Key does not have verify permission".to_string(),
            ));
        }

        // In a real implementation, verification could be done on the device
        // For simulation, we'll just log and return true
        tracing::info!(
            "Hardware device would verify signature for data of length {}",
            data.len()
        );

        Ok(true)
    }

    async fn export_public_key(&self, key_id: &str) -> Result<Vec<u8>, HsmError> {
        self.ensure_authenticated().await?;

        // Get key info
        let keys = self.keys.lock().await;
        let key_info = keys
            .get(key_id)
            .ok_or_else(|| HsmError::KeyNotFound(key_id.to_string()))?;

        // In a real implementation, we would request the public key from the device
        // For simulation, return a dummy public key
        tracing::info!(
            "Hardware device would export public key for key ID: {}",
            key_id
        );

        // Return a dummy compressed public key (33 bytes)
        Ok(vec![
            0x02, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d,
            0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b,
            0x1c, 0x1d, 0x1e, 0x1f, 0x20,
        ])
    }

    async fn list_keys(&self) -> Result<Vec<KeyInfo>, HsmError> {
        self.ensure_authenticated().await?;

        let keys = self.keys.lock().await;
        Ok(keys.values().cloned().collect())
    }

    async fn delete_key(&self, key_id: &str) -> Result<(), HsmError> {
        self.ensure_authenticated().await?;

        let mut keys = self.keys.lock().await;

        if keys.remove(key_id).is_none() {
            return Err(HsmError::KeyNotFound(key_id.to_string()));
        }

        tracing::info!("Deleted key {} from hardware device", key_id);
        Ok(())
    }

    async fn get_status(&self) -> Result<HsmProviderStatus, HsmError> {
        let state = self.connection_state.lock().await;

        match *state {
            ConnectionState::Disconnected => Ok(HsmProviderStatus::Unavailable),
            ConnectionState::Connected => Ok(HsmProviderStatus::NeedsAuthentication),
            ConnectionState::Authenticated => Ok(HsmProviderStatus::Ready),
        }
    }

    async fn close(&self) -> Result<(), HsmError> {
        let mut state = self.connection_state.lock().await;
        *state = ConnectionState::Disconnected;

        tracing::info!("Closed connection to hardware HSM device");
        Ok(())
    }

    async fn execute_operation(&self, request: HsmRequest) -> Result<HsmResponse, HsmError> {
        match request.operation {
            HsmOperation::GenerateKey => {
                let params: KeyGenParams = serde_json::from_value(request.parameters.clone())
                    .map_err(|e| {
                        HsmError::InvalidParameters(format!(
                            "Invalid key generation parameters: {}",
                            e
                        ))
                    })?;

                let key_pair = self.generate_key(params).await?;
                let response_data = serde_json::to_value(key_pair)
                    .map_err(|e| HsmError::SerializationError(e.to_string()))?;

                Ok(HsmResponse::success(request.id, Some(response_data)))
            }
            HsmOperation::Sign => {
                let params: SignParams = serde_json::from_value(request.parameters.clone())
                    .map_err(|e| {
                        HsmError::InvalidParameters(format!("Invalid signing parameters: {}", e))
                    })?;

                // [AIR-3][AIS-3][BPC-3][RES-3] Sign data using hardware HSM
                let signature = self
                    .sign(&params.key_id, params._algorithm, &params.data)
                    .await?;
                // [AIR-3][AIS-3][BPC-3][RES-3] Use base64 Engine for encoding
                // This follows official Bitcoin Improvement Proposals (BIPs) standards for secure data handling
                let response_data = serde_json::to_value(Base64SignatureResponse {
                    signature: base64::engine::general_purpose::STANDARD.encode(&signature),
                    _algorithm: params._algorithm,
                })
                .map_err(|e| HsmError::SerializationError(e.to_string()))?;

                Ok(HsmResponse::success(request.id, Some(response_data)))
            }
            HsmOperation::Custom(op) if op == "sign_bitcoin_tx" => {
                let params: BitcoinTxSignParams =
                    serde_json::from_value(request.parameters.clone()).map_err(|e| {
                        HsmError::InvalidParameters(format!(
                            "Invalid Bitcoin TX signing parameters: {}",
                            e
                        ))
                    })?;

                // Decode PSBT
                let mut psbt = bitcoin::psbt::Psbt::from_str(&params.psbt)
                    .map_err(|e| HsmError::InvalidParameters(format!("Invalid PSBT: {}", e)))?;

                // Sign the transaction
                self.sign_bitcoin_transaction(&params.key_id, &mut psbt)
                    .await?;

                // Return the signed PSBT
                let response_data = serde_json::json!({
                    "signed_psbt": psbt.to_string(),
                    "network": "testnet",
                });

                Ok(HsmResponse::success(request.id, Some(response_data)))
            }
            HsmOperation::Custom(op) if op == "connect" => {
                self.connect().await?;
                Ok(HsmResponse::success(request.id, None))
            }
            HsmOperation::Custom(op) if op == "authenticate" => {
                self.authenticate().await?;
                Ok(HsmResponse::success(request.id, None))
            }
            _ => Err(HsmError::UnsupportedOperation(format!(
                "{:?}",
                request.operation
            ))),
        }
    }
}

/// Parameters for signing operation
#[derive(Debug, serde::Deserialize)]
struct SignParams {
    key_id: String,
    _algorithm: SigningAlgorithm,
    data: Vec<u8>,
}

/// Parameters for Bitcoin transaction signing
#[derive(Debug, serde::Deserialize)]
struct BitcoinTxSignParams {
    key_id: String,
    psbt: String,
}

/// Response for signature in base64 format
#[derive(Debug, serde::Serialize)]
struct Base64SignatureResponse {
    signature: String,
    _algorithm: SigningAlgorithm,
}