anya-core 1.2.0

use std::error::Error;
// src/bitcoin/sidechains/liquid/client.rs

//! Liquid client implementation
//!
//! Provides a client for interacting with the Liquid sidechain.
//! Implements Blockstream's Liquid protocol specifications.
//! [AIR-3][AIS-3][AIM-3][AIP-3][RES-3]

use serde::{Serialize, Deserialize};
use std::str::FromStr;
use std::fmt;
use std::sync::Arc;
use std::collections::HashMap;
use url::Url;
use thiserror::Error;
use async_trait::async_trait;
use elements::{
    encode::serialize, 
    Address, 
    Script, 
    Transaction, 
    TxOut, 
    BlockHash, 
    Txid, 
    AssetId, 
    hex::ToHex,
    confidential::{Asset, Value},
    issuance::{AssetIssuance, ContractHash, IssuanceEntropy},
};
use bitcoin::Amount;
use tokio::sync::Mutex;
use elements_rpc::{RawTransaction, Client as ElementsClient, ElementsRpcApi};

use crate::AnyaResult;

/// Errors that can occur during Liquid client operations
#[derive(Error, Debug)]
pub enum LiquidError {
    /// Network error
    #[error("Network error: {0}")]
    NetworkError(String),
    
    /// RPC error
    #[error("RPC error: {0}")]
    RpcError(String),
    
    /// Transaction error
    #[error("Transaction error: {0}")]
    TransactionError(String),
    
    /// Encoding error
    #[error("Encoding error: {0}")]
    EncodingError(String),
    
    /// Wallet error
    #[error("Wallet error: {0}")]
    WalletError(String),
    
    /// Asset error
    #[error("Asset error: {0}")]
    AssetError(String),
    
    /// Validation error
    #[error("Validation error: {0}")]
    ValidationError(String),
    
    /// Configuration error
    #[error("Configuration error: {0}")]
    ConfigurationError(String),
    
    /// Peg operation error
    #[error("Peg operation error: {0}")]
    PegError(String),
    
    /// No such asset
    #[error("No such asset: {0}")]
    NoSuchAsset(String),
    
    /// Insufficient funds
    #[error("Insufficient funds: {0}")]
    InsufficientFunds(String),
}

/// Network type for Liquid
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum NetworkType {
    /// Mainnet
    Mainnet,
    
    /// Testnet
    Testnet,
    
    /// Regtest (local development)
    Regtest,
}

impl fmt::Display for NetworkType {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            NetworkType::Mainnet => write!(f, "mainnet"),
            NetworkType::Testnet => write!(f, "testnet"),
            NetworkType::Regtest => write!(f, "regtest"),
        }
    }
}

impl NetworkType {
    /// Get a default node URL for this network
    pub fn default_node_url(&self) -> &'static str {
        match self {
            NetworkType::Mainnet => "https://liquid.network:7041",
            NetworkType::Testnet => "https://liquidtestnet.com:18891",
            NetworkType::Regtest => "http://localhost:7041",
        }
    }
    
    /// Get the policy asset (L-BTC) ID for this network
    pub fn policy_asset(&self) -> &'static str {
        match self {
            NetworkType::Mainnet => "6f0279e9ed041c3d710a9f57d0c02928416460c4b722ae3457a11eec381c526d",
            NetworkType::Testnet => "144c654344aa716d6f3abcc1ca90e5641e4e2a7f633bc09fe3baf64585819a49",
            NetworkType::Regtest => "5ac9f65c0efcc4775e0baec4ec03abdde22473cd3cf33c0419ca290e0751b225",
        }
    }
}

/// Liquid client configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LiquidClientConfig {
    /// Network type
    pub network: NetworkType,
    
    /// Node URL
    pub node_url: String,
    
    /// RPC username
    pub rpc_user: String,
    
    /// RPC password
    pub rpc_password: String,
    
    /// Transaction confirmation blocks
    pub tx_confirmation_blocks: u32,
    
    /// Transaction confirmation timeout (in seconds)
    pub tx_confirmation_timeout: u64,
    
    /// Default fee rate (satoshis per vbyte)
    pub default_fee_rate: u64,
}

impl Default for LiquidClientConfig {
    fn default() -> Self {
        Self {
            network: NetworkType::Testnet,
            node_url: NetworkType::Testnet.default_node_url().to_string(),
            rpc_user: "user".to_string(),
            rpc_password: "password".to_string(),
            tx_confirmation_blocks: 2,
            tx_confirmation_timeout: 300, // 5 minutes
            default_fee_rate: 1, // 1 sat/vbyte
        }
    }
}

/// A transaction response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LiquidTransactionResponse {
    /// Transaction ID
    pub txid: String,
    
    /// Transaction version
    pub version: u32,
    
    /// Transaction size
    pub size: u32,
    
    /// Transaction locktime
    pub locktime: u32,
    
    /// Block hash (None if unconfirmed)
    pub block_hash: Option<String>,
    
    /// Block height (None if unconfirmed)
    pub block_height: Option<u32>,
    
    /// Timestamp (None if unconfirmed)
    pub timestamp: Option<u64>,
    
    /// Inputs
    pub vin: Vec<LiquidTxInputResponse>,
    
    /// Outputs
    pub vout: Vec<LiquidTxOutputResponse>,
    
    /// Fee
    pub fee: u64,
    
    /// Fee asset
    pub fee_asset: String,
    
    /// Status (confirmed or unconfirmed)
    pub status: TransactionStatus,
    
    /// Hex representation of the transaction
    pub hex: String,
}

/// Input of a transaction response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LiquidTxInputResponse {
    /// Previous transaction ID
    pub txid: String,
    
    /// Previous output index
    pub vout: u32,
    
    /// Input value (if confidential, this is revealed if you own the key)
    pub value: Option<u64>,
    
    /// Input asset (if confidential, this is revealed if you own the key)
    pub asset: Option<String>,
    
    /// Input address (if available)
    pub address: Option<String>,
    
    /// Input script
    pub script_sig: Option<String>,
    
    /// Witness data
    pub witness: Option<Vec<String>>,
    
    /// Is this a pegin input
    pub is_pegin: bool,
    
    /// Sequence
    pub sequence: u32,
}

/// Output of a transaction response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LiquidTxOutputResponse {
    /// Output value
    pub value: u64,
    
    /// Output asset
    pub asset: String,
    
    /// Output address
    pub address: Option<String>,
    
    /// Output script
    pub script_pubkey: String,
    
    /// Is this value confidential
    pub value_blinding_factor: Option<String>,
    
    /// Is this asset confidential
    pub asset_blinding_factor: Option<String>,
    
    /// Is this a pegout output
    pub is_pegout: bool,
}

/// Transaction status
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum TransactionStatus {
    /// Transaction is confirmed
    Confirmed,
    
    /// Transaction is in the mempool
    Mempool,
    
    /// Transaction is unconfirmed and not in mempool (possibly replaced by fee)
    Unknown,
}

/// Asset issuance parameters
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AssetIssuanceParams {
    /// Asset name
    pub asset_name: String,
    
    /// Asset ticker symbol
    pub ticker: String,
    
    /// Precision (decimal places)
    pub precision: u8,
    
    /// Initial issuance amount
    pub initial_amount: u64,
    
    /// Is the asset reissuable
    pub reissuable: bool,
    
    /// Domain (helps with verification)
    pub domain: Option<String>,
    
    /// Contract hash (to uniquely identify the asset contract)
    pub contract_hash: Option<String>,
}

/// Asset metadata
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AssetMetadata {
    /// Asset name
    pub name: String,
    
    /// Asset ticker symbol
    pub ticker: String,
    
    /// Precision (decimal places)
    pub precision: u8,
    
    /// Domain (helps with verification)
    pub domain: Option<String>,
    
    /// Description of the asset
    pub description: Option<String>,
    
    /// Issuer name
    pub issuer: Option<String>,
    
    /// Issue date (Unix timestamp)
    pub issue_date: Option<u64>,
    
    /// Total issuance 
    pub total_issuance: Option<u64>,
    
    /// Is the asset reissuable
    pub reissuable: bool,
    
    /// Additional metadata (key-value pairs)
    pub extra: HashMap<String, String>,
}

/// Asset information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AssetInfo {
    /// Asset ID
    pub asset_id: String,
    
    /// Asset metadata
    pub metadata: AssetMetadata,
    
    /// Whether it's the policy asset (L-BTC)
    pub is_policy_asset: bool,
    
    /// Total issuance so far
    pub issuance_amount: u64,
    
    /// Issuance txid
    pub issuance_txid: Option<String>,
    
    /// Issuance entropy (used to derive asset IDs)
    pub issuance_entropy: Option<String>,
    
    /// Reissuance token asset ID (if reissuable)
    pub reissuance_token: Option<String>,
    
    /// Contract hash
    pub contract_hash: Option<String>,
}

/// Liquid client trait
#[async_trait]
pub trait LiquidClientTrait {
    /// Get the current block count
    async fn get_block_count(&self) -> Result<u32, LiquidError>;
    
    /// Get a block by hash
    async fn get_block(&self, hash: &str) -> Result<elements::Block, LiquidError>;
    
    /// Get raw transaction
    async fn get_raw_transaction(&self, txid: &str) -> Result<Transaction, LiquidError>;
    
    /// Get transaction information
    async fn get_transaction(&self, txid: &str) -> Result<LiquidTransactionResponse, LiquidError>;
    
    /// Send raw transaction
    async fn send_raw_transaction(&self, tx: &Transaction) -> Result<Txid, LiquidError>;
    
    /// Get asset information
    async fn get_asset_info(&self, asset_id: &str) -> Result<AssetInfo, LiquidError>;
    
    /// Issue a new asset
    async fn issue_asset(&self, params: AssetIssuanceParams) -> Result<(String, Transaction), LiquidError>;
    
    /// Reissue an existing asset
    async fn reissue_asset(&self, asset_id: &str, amount: u64) -> Result<(String, Transaction), LiquidError>;
    
    /// Wait for transaction confirmation
    async fn wait_for_confirmation(&self, txid: &Txid) -> Result<LiquidTransactionResponse, LiquidError>;
}

/// Liquid client implementation
pub struct LiquidClient {
    /// Client configuration
    config: LiquidClientConfig,
    
    /// Elements RPC client
    rpc: ElementsClient,
    
    /// Known assets cache
    assets_cache: Arc<Mutex<HashMap<String, AssetInfo>>>,
}

impl LiquidClient {
    /// Create a new Liquid client
    pub async fn new(config: LiquidClientConfig) -> Result<Self, LiquidError> {
        // Validate URL
        let url = Url::parse(&config.node_url)
            .map_err(|e| LiquidError::ConfigurationError(format!("Invalid node URL: {}", e)))?;
            
        // Create RPC client
        let rpc = ElementsClient::new(
            &config.node_url,
            &config.rpc_user,
            &config.rpc_password
        ).map_err(|e| LiquidError::NetworkError(format!("Failed to create RPC client: {}", e)))?;
        
        // Test connection
        let _block_count = rpc.get_block_count().await
            .map_err(|e| LiquidError::NetworkError(format!("Failed to connect to node: {}", e)))?;
            
        // Create client
        let client = Self {
            config,
            rpc,
            assets_cache: Arc::new(Mutex::new(HashMap::new())),
        };
        
        // Initialize cache with policy asset
        let policy_asset_id = client.config.network.policy_asset();
        let mut cache = client.assets_cache.lock().await;
        cache.insert(policy_asset_id.to_string(), AssetInfo {
            asset_id: policy_asset_id.to_string(),
            metadata: AssetMetadata {
                name: "Liquid Bitcoin".to_string(),
                ticker: "L-BTC".to_string(),
                precision: 8,
                domain: Some("blockstream.com".to_string()),
                description: Some("Bitcoin on the Liquid Network".to_string()),
                issuer: Some("Liquid Federation".to_string()),
                issue_date: None,
                total_issuance: None,
                reissuable: false,
                extra: HashMap::new(),
            },
            is_policy_asset: true,
            issuance_amount: 0, // Unknown
            issuance_txid: None,
            issuance_entropy: None,
            reissuance_token: None,
            contract_hash: None,
        });
        
        Ok(client)
    }
    
    /// Get the policy asset ID (L-BTC)
    pub fn policy_asset_id(&self) -> String {
        self.config.network.policy_asset().to_string()
    }
    
    /// Create a blinded transaction
    pub async fn create_transaction(
        &self,
        inputs: Vec<(Txid, u32)>,
        outputs: Vec<(Address, AssetId, u64)>,
        fee_rate: Option<u64>,
    ) -> Result<Transaction, LiquidError> {
        // Fetch UTXOs for inputs to get their values and assets
        let mut tx_inputs = Vec::new();
        let mut input_values = Vec::new();
        let mut input_assets = Vec::new();
        
        for (txid, vout) in inputs {
            // Get the transaction
            let prev_tx = self.get_raw_transaction(&txid.to_hex())
                .await?;
                
            // Get the output being spent
            let output = prev_tx.output.get(vout as usize)
                .ok_or_else(|| LiquidError::ValidationError(
                    format!("Output index {} not found in transaction {}", vout, txid)
                ))?;
                
            // Extract value and asset
            let value = match output.value {
                Value::Explicit(value) => value,
                _ => return Err(LiquidError::ValidationError(
                    format!("Confidential value in input {}:{}", txid, vout)
                )),
            };
            
            let asset = match output.asset {
                Asset::Explicit(asset) => asset,
                _ => return Err(LiquidError::ValidationError(
                    format!("Confidential asset in input {}:{}", txid, vout)
                )),
            };
            
            // Add to our collections
            tx_inputs.push((txid, vout));
            input_values.push(value);
            input_assets.push(asset);
        }
        
        // Group outputs by asset
        let mut output_map: HashMap<AssetId, Vec<(Address, u64)>> = HashMap::new();
        for (address, asset_id, value) in outputs {
            output_map.entry(asset_id)
                .or_insert_with(Vec::new)
                .push((address, value));
        }
        
        // Calculate fee based on estimated size
        let estimated_size = 100 + tx_inputs.len() * 150 + output_map.len() * 50;
        let fee_rate = fee_rate.unwrap_or(self.config.default_fee_rate);
        let fee = (estimated_size as u64 * fee_rate) / 1000;
        
        // Ensure we have enough of each asset
        for (asset_id, outputs) in &output_map {
            let total_output = outputs.iter().map(|(_, value)| *value).sum::<u64>();
            
            // Find matching inputs
            let matching_inputs = input_assets.iter()
                .enumerate()
                .filter(|(_, a)| **a == *asset_id)
                .map(|(i, _)| input_values[i])
                .sum::<u64>();
                
            if matching_inputs < total_output {
                return Err(LiquidError::InsufficientFunds(
                    format!("Insufficient funds for asset {}: {} < {}", asset_id, matching_inputs, total_output)
                ));
            }
        }
        
        // Create the transaction
        let mut tx = Transaction {
            version: 2,
            lock_time: 0,
            input: Vec::new(),
            output: Vec::new(),
        };
        
        // Add inputs
        for (txid, vout) in tx_inputs {
            tx.input.push(elements::TxIn {
                previous_output: elements::OutPoint {
                    txid,
                    vout,
                },
                script_sig: Script::new(),
                sequence: 0xFFFFFFFF,
                asset_issuance: AssetIssuance::default(),
                witness: elements::TxInWitness::default(),
            });
        }
        
        // Add outputs
        for (asset_id, outputs) in output_map {
            for (address, value) in outputs {
                tx.output.push(TxOut {
                    asset: Asset::Explicit(asset_id),
                    value: Value::Explicit(value),
                    nonce: elements::confidential::Nonce::Null,
                    script_pubkey: address.script_pubkey(),
                    witness: elements::TxOutWitness::default(),
                });
            }
        }
        
        // Add fee output
        let policy_asset = AssetId::from_str(self.config.network.policy_asset())
            .map_err(|e| LiquidError::ValidationError(
                format!("Invalid policy asset ID: {}", e)
            ))?;
            
        tx.output.push(TxOut {
            asset: Asset::Explicit(policy_asset),
            value: Value::Explicit(fee),
            nonce: elements::confidential::Nonce::Null,
            script_pubkey: Script::new(),
            witness: elements::TxOutWitness::default(),
        });
        
        Ok(tx)
    }
    
    /// Generate asset metadata to include in issuance
    fn generate_asset_metadata(params: &AssetIssuanceParams) -> Result<String, LiquidError> {
        let metadata = AssetMetadata {
            name: params.asset_name.clone(),
            ticker: params.ticker.clone(),
            precision: params.precision,
            domain: params.domain.clone(),
            description: None,
            issuer: None,
            issue_date: Some(std::time::SystemTime::now()
                .duration_since(std::time::UNIX_EPOCH)
                .unwrap_or_default()
                .as_secs()),
            total_issuance: Some(params.initial_amount),
            reissuable: params.reissuable,
            extra: HashMap::new(),
        };
        
        serde_json::to_string(&metadata)
            .map_err(|e| LiquidError::EncodingError(format!("Failed to encode asset metadata: {}", e)))
    }
    
    /// Parse transaction to extract asset details
    async fn parse_transaction_assets(&self, tx: &Transaction) -> Result<HashMap<String, AssetInfo>, LiquidError> {
        let mut assets = HashMap::new();
        
        // Look for asset issuances
        for (input_idx, input) in tx.input.iter().enumerate() {
            if input.asset_issuance.is_issuance() {
                // Extract issuance details
                let issuance = &input.asset_issuance;
                
                // Generate entropy from outpoint and contract hash
                let outpoint = &input.previous_output;
                let contract_hash = if issuance.asset_blinding_nonce != [0; 32] {
                    // Reissuance
                    ContractHash::from(issuance.asset_entropy)
                } else {
                    // New issuance
                    // In a real implementation, we'd extract this from OP_RETURN data
                    ContractHash::from([0; 32])
                };
                
                // Calculate issuance entropy
                let issuance_entropy = IssuanceEntropy::new(outpoint, contract_hash);
                
                // Generate asset ID
                let asset_id = AssetId::from_entropy(issuance_entropy);
                
                // Extract asset amount
                let issuance_amount = if let Some(value) = issuance.asset_amount {
                    value
                } else {
                    0 // Confidential amount
                };
                
                // Try to extract metadata from OP_RETURN output
                let mut metadata: Option<AssetMetadata> = None;
                for output in &tx.output {
                    if output.script_pubkey.is_op_return() {
                        if let Some(data) = output.script_pubkey.op_return_data() {
                            if let Ok(meta_str) = String::from_utf8(data.to_vec()) {
                                if let Ok(meta) = serde_json::from_str::<AssetMetadata>(&meta_str) {
                                    metadata = Some(meta);
                                    break;
                                }
                            }
                        }
                    }
                }
                
                // Create asset info
                let asset_info = AssetInfo {
                    asset_id: asset_id.to_hex(),
                    metadata: metadata.unwrap_or_else(|| AssetMetadata {
                        name: format!("Asset {}", asset_id.to_hex()),
                        ticker: "UNKN".to_string(),
                        precision: 8,
                        domain: None,
                        description: None,
                        issuer: None,
                        issue_date: None,
                        total_issuance: Some(issuance_amount as u64),
                        reissuable: issuance.token_amount.is_some(),
                        extra: HashMap::new(),
                    }),
                    is_policy_asset: false,
                    issuance_amount: issuance_amount as u64,
                    issuance_txid: Some(tx.txid().to_hex()),
                    issuance_entropy: Some(issuance_entropy.to_hex()),
                    reissuance_token: if issuance.token_amount.is_some() {
                        // Calculate reissuance token asset ID
                        Some(AssetId::reissuance_token_from_entropy(issuance_entropy, issuance.asset_blinding_nonce != [0; 32]).to_hex())
                    } else {
                        None
                    },
                    contract_hash: Some(contract_hash.to_hex()),
                };
                
                assets.insert(asset_id.to_hex(), asset_info);
            }
        }
        
        Ok(assets)
    }
}

#[async_trait]
impl LiquidClientTrait for LiquidClient {
    async fn get_block_count(&self) -> Result<u32, LiquidError> {
        self.rpc.get_block_count().await
            .map_err(|e| LiquidError::RpcError(format!("Failed to get block count: {}", e)))
    }
    
    async fn get_block(&self, hash: &str) -> Result<elements::Block, LiquidError> {
        // Parse hash
        let hash = BlockHash::from_str(hash)
            .map_err(|e| LiquidError::ValidationError(format!("Invalid block hash: {}", e)))?;
            
        // Get block
        let block_hex = self.rpc.get_block(&hash).await
            .map_err(|e| LiquidError::RpcError(format!("Failed to get block: {}", e)))?;
            
        // Parse block
        elements::encode::deserialize(&hex::decode(block_hex)?)
            .map_err(|e| LiquidError::EncodingError(format!("Failed to decode block: {}", e)))
    }
    
    async fn get_raw_transaction(&self, txid: &str) -> Result<Transaction, LiquidError> {
        // Parse txid
        let txid = Txid::from_str(txid)
            .map_err(|e| LiquidError::ValidationError(format!("Invalid transaction ID: {}", e)))?;
            
        // Get raw transaction
        let tx_hex = self.rpc.get_raw_transaction_hex(&txid, None).await
            .map_err(|e| LiquidError::RpcError(format!("Failed to get transaction: {}", e)))?;
            
        // Parse transaction
        elements::encode::deserialize(&hex::decode(tx_hex)?)
            .map_err(|e| LiquidError::EncodingError(format!("Failed to decode transaction: {}", e)))
    }
    
    async fn get_transaction(&self, txid: &str) -> Result<LiquidTransactionResponse, LiquidError> {
        // Get raw transaction first
        let tx = self.get_raw_transaction(txid).await?;
        
        // Get more details using getrawtransaction with verbose flag
        let tx_info = self.rpc.get_raw_transaction(&Txid::from_str(txid).unwrap_or_default(), None).await
            .map_err(|e| LiquidError::RpcError(format!("Failed to get transaction info: {}", e)))?;
            
        // Convert RPC response to our format
        let mut inputs = Vec::new();
        for (i, input) in tx.input.iter().enumerate() {
            inputs.push(LiquidTxInputResponse {
                txid: input.previous_output.txid.to_hex(),
                vout: input.previous_output.vout,
                value: None, // Need to look up previous tx to get this
                asset: None, // Need to look up previous tx to get this
                address: None, // Need to decode script to get this
                script_sig: Some(input.script_sig.to_hex()),
                witness: Some(input.witness.to_vec().iter().map(|w| hex::encode(w)).collect()),
                is_pegin: false, // Would need to check for pegin data
                sequence: input.sequence,
            });
        }
        
        let mut outputs = Vec::new();
        for (i, output) in tx.output.iter().enumerate() {
            let value = match output.value {
                Value::Explicit(v) => v as u64,
                Value::Confidential(_, _) => 0, // Confidential value
                Value::Null => 0,
            };
            
            let asset = match output.asset {
                Asset::Explicit(a) => a.to_hex(),
                Asset::Confidential(_, _) => "confidential".to_string(),
                Asset::Null => "null".to_string(),
            };
            
            outputs.push(LiquidTxOutputResponse {
                value,
                asset,
                address: None, // Would need to decode script to address
                script_pubkey: output.script_pubkey.to_hex(),
                value_blinding_factor: None, // Would need blinding key to extract
                asset_blinding_factor: None, // Would need blinding key to extract
                is_pegout: false, // Would need to check for pegout data
            });
        }
        
        // Find policy asset and extract fee
        let policy_asset = self.config.network.policy_asset();
        let fee = tx_info.fee.unwrap_or(0.0) * 100_000_000.0; // Convert BTC to satoshis
        
        let response = LiquidTransactionResponse {
            txid: tx.txid().to_hex(),
            version: tx.version as u32,
            size: serialize(&tx).len() as u32,
            locktime: tx.lock_time,
            block_hash: tx_info.blockhash.map(|h| h.to_hex()),
            block_height: None, // Not directly available from RPC
            timestamp: tx_info.time.map(|t| t as u64),
            vin: inputs,
            vout: outputs,
            fee: fee as u64,
            fee_asset: policy_asset.to_string(),
            status: if tx_info.confirmations.unwrap_or(0) > 0 {
                TransactionStatus::Confirmed
            } else {
                TransactionStatus::Mempool
            },
            hex: hex::encode(serialize(&tx)),
        };
        
        Ok(response)
    }
    
    async fn send_raw_transaction(&self, tx: &Transaction) -> Result<Txid, LiquidError> {
        // Serialize transaction
        let tx_hex = hex::encode(serialize(tx));
        
        // Send transaction
        self.rpc.send_raw_transaction(&tx_hex).await
            .map_err(|e| LiquidError::TransactionError(format!("Failed to send transaction: {}", e)))
    }
    
    async fn get_asset_info(&self, asset_id: &str) -> Result<AssetInfo, LiquidError> {
        // Check cache first
        {
            let cache = self.assets_cache.lock().await;
            if let Some(info) = cache.get(asset_id) {
                return Ok(info.clone());
            }
        }
        
        // Check if it's the policy asset
        if asset_id == self.config.network.policy_asset() {
            return Ok(AssetInfo {
                asset_id: asset_id.to_string(),
                metadata: AssetMetadata {
                    name: "Liquid Bitcoin".to_string(),
                    ticker: "L-BTC".to_string(),
                    precision: 8,
                    domain: Some("blockstream.com".to_string()),
                    description: Some("Bitcoin on the Liquid Network".to_string()),
                    issuer: Some("Liquid Federation".to_string()),
                    issue_date: None,
                    total_issuance: None,
                    reissuable: false,
                    extra: HashMap::new(),
                },
                is_policy_asset: true,
                issuance_amount: 0, // Unknown
                issuance_txid: None,
                issuance_entropy: None,
                reissuance_token: None,
                contract_hash: None,
            });
        }
        
        // Try to retrieve from block explorer API or node
        // This is a simplified implementation
        
        // We'd need to implement logic to:
        // 1. Scan the blockchain for issuance transactions
        // 2. Extract metadata from OP_RETURN outputs
        // 3. Calculate total issuance amount
        
        // For now, return a placeholder
        let info = AssetInfo {
            asset_id: asset_id.to_string(),
            metadata: AssetMetadata {
                name: format!("Asset {}", asset_id),
                ticker: "UNKN".to_string(),
                precision: 8,
                domain: None,
                description: None,
                issuer: None,
                issue_date: None,
                total_issuance: None,
                reissuable: false,
                extra: HashMap::new(),
            },
            is_policy_asset: false,
            issuance_amount: 0,
            issuance_txid: None,
            issuance_entropy: None,
            reissuance_token: None,
            contract_hash: None,
        };
        
        // Cache it
        {
            let mut cache = self.assets_cache.lock().await;
            cache.insert(asset_id.to_string(), info.clone());
        }
        
        Ok(info)
    }
    
    async fn issue_asset(&self, params: AssetIssuanceParams) -> Result<(String, Transaction), LiquidError> {
        // In a real implementation, this would:
        // 1. Get UTXOs from the wallet
        // 2. Create a transaction with an issuance input
        // 3. Add appropriate outputs for the asset and reissuance token
        // 4. Sign and send the transaction
        
        // For now, we'll just simulate the process
        let contract_hash = match &params.contract_hash {
            Some(hash) => ContractHash::from_str(hash)
                .map_err(|e| LiquidError::ValidationError(format!("Invalid contract hash: {}", e)))?,
            None => ContractHash::from([0; 32]), // Default contract hash
        };
        
        // Generate asset ID (in a real implementation, this would be calculated from issuance entropy)
        let asset_id = format!("asset_{}", uuid::Uuid::new_v4().to_string().replace("-", ""));
        
        // Create transaction (this is a placeholder)
        let tx = Transaction {
            version: 2,
            lock_time: 0,
            input: Vec::new(),
            output: Vec::new(),
        };
        
        // In a real implementation, we'd return the actual asset ID
        Ok((asset_id, tx))
    }
    
    async fn reissue_asset(&self, asset_id: &str, amount: u64) -> Result<(String, Transaction), LiquidError> {
        // In a real implementation, this would:
        // 1. Find the reissuance token UTXO
        // 2. Create a transaction with a reissuance input
        // 3. Add appropriate outputs for the additional asset amount
        // 4. Sign and send the transaction
        
        // For now, we'll just simulate the process
        
        // Validate asset ID
        let _ = AssetId::from_str(asset_id)
            .map_err(|e| LiquidError::ValidationError(format!("Invalid asset ID: {}", e)))?;
            
        // Get asset info to check if it's reissuable
        let asset_info = self.get_asset_info(asset_id).await?;
        
        if asset_info.reissuance_token.is_none() {
            return Err(LiquidError::AssetError(
                format!("Asset {} is not reissuable", asset_id)
            ));
        }
        
        // Create transaction (this is a placeholder)
        let tx = Transaction {
            version: 2,
            lock_time: 0,
            input: Vec::new(),
            output: Vec::new(),
        };
        
        // In a real implementation, we'd create and send the actual transaction
        Ok((asset_id.to_string(), tx))
    }
    
    async fn wait_for_confirmation(&self, txid: &Txid) -> Result<LiquidTransactionResponse, LiquidError> {
        let start = std::time::Instant::now();
        let timeout = std::time::Duration::from_secs(self.config.tx_confirmation_timeout);
        
        let txid_str = txid.to_hex();
        
        loop {
            if start.elapsed() > timeout {
                return Err(LiquidError::TransactionError(
                    format!("Timeout waiting for confirmation of transaction {}", txid_str)
                ));
            }
            
            // Get transaction info
            match self.get_transaction(&txid_str).await {
                Ok(tx_response) => {
                    match tx_response.status {
                        TransactionStatus::Confirmed => {
                            return Ok(tx_response);
                        },
                        _ => {
                            // Not confirmed yet, wait a bit
                            tokio::time::sleep(std::time::Duration::from_secs(1)).await;
                        }
                    }
                },
                Err(e) => {
                    // If the error is "not found", the transaction might be still propagating
                    if format!("{}", e).contains("not found") {
                        tokio::time::sleep(std::time::Duration::from_secs(1)).await;
                    } else {
                        return Err(e);
                    }
                }
            }
        }
    }
}