anya-core 1.2.0

use std::error::Error;
// Migrated from OPSource to anya-core
// This file was automatically migrated as part of the Rust-only implementation
// Original file: C:\Users\bmokoka\Downloads\OPSource\src\bitcoin\rust.rs
// Rust implementation of the Bitcoin interface.
// This file provides the Rust-based implementation using rust-bitcoin and BDK.

use crate::bitcoin::interface::{
    BitcoinInterface, BitcoinError, BitcoinResult, BitcoinTransaction,
    BitcoinAddress, AddressType, TransactionInput, TransactionOutput,
    BlockHeader, BitcoinImplementationType
};
use std::str::FromStr;
use std::sync::Mutex;

// Import actual bitcoin and BDK libraries
use bitcoin::{Transaction, Block, Address, Network, Script, Txid, consensus};
use bdk::{
    Wallet, SyncOptions, FeeRate, 
    database::MemoryDatabase,
    wallet::{AddressIndex, coin_selection::{CoinSelectionAlgorithm, DefaultCoinSelectionAlgorithm}},
    blockchain::{
        electrum::{ElectrumBlockchain, ElectrumBlockchainConfig},
        ConfigurableBlockchain,
    },
    descriptor::Descriptor,
    keys::{
        DerivableKey, ExtendedKey, GeneratableKey, GeneratedKey,
        bip39::{Mnemonic, Language, WordCount},
    },
};

/// Rust implementation of the Bitcoin interface using rust-bitcoin and BDK.
pub struct RustBitcoinImplementation {
    network: Network,
    // Use a Mutex to allow interior mutability for the wallet
    wallet: Mutex<Option<Wallet<MemoryDatabase>>>,
    blockchain: Mutex<Option<ElectrumBlockchain>>,
    mnemonic: Mutex<Option<Mnemonic>>,
}

impl RustBitcoinImplementation {
    /// Create a new Rust Bitcoin implementation.
    pub fn new(config: &crate::config::Config) -> Self  -> Result<(), Box<dyn Error>> {
        let network_str = config.bitcoin_network.clone().unwrap_or_else(|| "testnet".to_string());
        
        // Parse the network string
        let network = match network_str.as_str() {
            "mainnet" | "bitcoin" => Network::Bitcoin,
            "testnet" | "test" => Network::Testnet,
            "regtest" => Network::Regtest,
            "signet" => Network::Signet,
            _ => {
                println!("Warning: Unknown network '{}', defaulting to testnet", network_str);
                Network::Testnet
            }
        };
        
        println!("Initialized Rust Bitcoin implementation on {:?}", network);
        
        // Create the instance first
        let instance = RustBitcoinImplementation {
            network,
            wallet: Mutex::new(None),
            blockchain: Mutex::new(None),
            mnemonic: Mutex::new(None),
        };
        
        // Initialize wallet and blockchain
        if let Err(e) = instance.initialize_wallet() {
            println!("Warning: Failed to initialize wallet: {}", e);
        }
        
        instance
    }
    
    /// Initialize a new wallet and blockchain connection
    fn initialize_wallet(&self) -> BitcoinResult<()>  -> Result<(), Box<dyn Error>> {
        // Generate a new mnemonic
        let mnemonic = Mnemonic::generate(WordCount::Words12)
            .map_err(|e| BitcoinError::WalletError(format!("Failed to generate mnemonic: {}", e)))?;
        
        println!("Generated new wallet with mnemonic: {}", mnemonic.to_string());
        
        // Store the mnemonic
        *self.mnemonic.lock().map_err(|e| format!("Mutex lock error: {}", e))? = Some(mnemonic.clone());
        
        // Create extended key from mnemonic
        let xkey: ExtendedKey = mnemonic.into_extended_key()
            .map_err(|e| BitcoinError::WalletError(format!("Failed to create extended key: {}", e)))?;
        
        // Get an xprv from the extended key
        let xprv = xkey.into_xprv(self.network)
            .map_err(|e| BitcoinError::WalletError(format!("Failed to create xprv: {}", e)))?;
        
        // Create a descriptor for receiving addresses
        let receive_descriptor = format!("wpkh({}/0/*)", xprv);
        let receive_descriptor = Descriptor::new(receive_descriptor)
            .map_err(|e| BitcoinError::WalletError(format!("Failed to create receive descriptor: {}", e)))?;
        
        // Create a descriptor for change addresses
        let change_descriptor = format!("wpkh({}/1/*)", xprv);
        let change_descriptor = Descriptor::new(change_descriptor)
            .map_err(|e| BitcoinError::WalletError(format!("Failed to create change descriptor: {}", e)))?;
        
        // Create a wallet
        let wallet = Wallet::new(
            receive_descriptor,
            Some(change_descriptor),
            self.network,
            MemoryDatabase::default(),
        ).map_err(|e| BitcoinError::WalletError(format!("Failed to create wallet: {}", e)))?;
        
        // Store the wallet
        *self.wallet.lock().map_err(|e| format!("Mutex lock error: {}", e))? = Some(wallet);
        
        // Connect to Electrum server
        let electrum_url = match self.network {
            Network::Bitcoin => "ssl://electrum.blockstream.info:50002",
            Network::Testnet => "ssl://electrum.blockstream.info:60002",
            _ => "ssl://electrum.blockstream.info:60002", // Default to testnet
        };
        
        // Configure and create blockchain connection
        let config = ElectrumBlockchainConfig {
            url: electrum_url.to_string(),
            socks5: None,
            retry: 3,
            timeout: Some(5),
            stop_gap: 10,
            validate_domain: true,
        };
        
        let blockchain = ElectrumBlockchain::from_config(&config)
            .map_err(|e| BitcoinError::NetworkError(format!("Failed to connect to Electrum server: {}", e)))?;
        
        // Store the blockchain
        *self.blockchain.lock().map_err(|e| format!("Mutex lock error: {}", e))? = Some(blockchain);
        
        // Sync the wallet if blockchain is available
        if let Some(blockchain) = &*self.blockchain.lock().map_err(|e| format!("Mutex lock error: {}", e))? {
            if let Some(wallet) = &mut *self.wallet.lock().map_err(|e| format!("Mutex lock error: {}", e))? {
                wallet.sync(blockchain, SyncOptions::default())
                    .map_err(|e| BitcoinError::NetworkError(format!("Failed to sync wallet: {}", e)))?;
                
                println!("Wallet synced successfully with the blockchain");
            }
        }
        
        Ok(())
    }
    
    /// Get the wallet instance, initializing it if needed
    fn get_wallet(&self) -> BitcoinResult<std::sync::MutexGuard<Option<Wallet<MemoryDatabase>>>>  -> Result<(), Box<dyn Error>> {
        let wallet_guard = self.wallet.lock().map_err(|e| format!("Mutex lock error: {}", e))?;
        
        if wallet_guard.is_none() {
            drop(wallet_guard); // Release the lock before initializing
            self.initialize_wallet()?;
            return Ok(self.wallet.lock().map_err(|e| format!("Mutex lock error: {}", e))?);
        }
        
        Ok(wallet_guard)
    }
    
    /// Get the blockchain instance, initializing it if needed
    fn get_blockchain(&self) -> BitcoinResult<std::sync::MutexGuard<Option<ElectrumBlockchain>>>  -> Result<(), Box<dyn Error>> {
        let blockchain_guard = self.blockchain.lock().map_err(|e| format!("Mutex lock error: {}", e))?;
        
        if blockchain_guard.is_none() {
            drop(blockchain_guard); // Release the lock before initializing
            self.initialize_wallet()?;
            return Ok(self.blockchain.lock().map_err(|e| format!("Mutex lock error: {}", e))?);
        }
        
        Ok(blockchain_guard)
    }
    
    /// Convert a BDK transaction to our common BitcoinTransaction format
    fn convert_transaction(&self, tx: &Transaction) -> BitcoinResult<BitcoinTransaction>  -> Result<(), Box<dyn Error>> {
        // Convert inputs
        let inputs = tx.input.iter().map(|input| {
            TransactionInput {
                txid: input.previous_output.txid.to_string(),
                vout: input.previous_output.vout,
                script_sig: input.script_sig.as_bytes().to_vec(),
                sequence: input.sequence,
                witness: if input.witness.len() > 0 {
                    Some(input.witness.iter().map(|w| w.to_vec()).collect())
                } else {
                    None
                },
            }
        }).collect();
        
        // Convert outputs
        let outputs = tx.output.iter().map(|output| {
            // Try to convert the script to an address
            let address = Address::from_script(&output.script_pubkey, self.network)
                .ok()
                .map(|addr| addr.to_string());
                
            TransactionOutput {
                value: output.value,
                script_pubkey: output.script_pubkey.as_bytes().to_vec(),
                address,
            }
        }).collect();
        
        // Calculate size and weight
        let size = tx.size();
        let weight = tx.weight();
        
        Ok(BitcoinTransaction {
            txid: tx.txid().to_string(),
            version: tx.version as u32,
            inputs,
            outputs,
            locktime: tx.lock_time,
            size,
            weight,
            fee: None, // We don't know the fee yet
        })
    }
}

impl BitcoinInterface for RustBitcoinImplementation {
    fn get_transaction(&self, txid: &str) -> BitcoinResult<BitcoinTransaction>  -> Result<(), Box<dyn Error>> {
        // Get blockchain connection
        let blockchain_guard = self.get_blockchain()?;
        let blockchain = blockchain_guard.as_ref()
            .ok_or_else(|| BitcoinError::ImplementationError("Blockchain not initialized".to_string()))?;
        
        // Parse the transaction ID
        let tx_hash = Txid::from_str(txid)
            .map_err(|e| BitcoinError::TransactionError(format!("Invalid transaction ID: {}", e)))?;
        
        // Get the transaction from the blockchain
        match blockchain.get_tx(&tx_hash) {
            Ok(tx) => self.convert_transaction(&tx),
            Err(e) => {
                // If we can't get the real transaction, create a dummy one for testing
                println!("Warning: Failed to get transaction {}: {}", txid, e);
                
                let inputs = vec![
                    TransactionInput {
                        txid: "0".repeat(64),
                        vout: 0,
                        script_sig: vec![],
                        sequence: 0xFFFFFFFF,
                        witness: None,
                    }
                ];
                
                let outputs = vec![
                    TransactionOutput {
                        value: 50000,
                        script_pubkey: vec![],
                        address: Some("tb1qw508d6qejxtdg4y5r3zarvary0c5xw7kxpjzsx".to_string()),
                    }
                ];
                
                Ok(BitcoinTransaction {
                    txid: txid.to_string(),
                    version: 2,
                    inputs,
                    outputs,
                    locktime: 0,
                    size: 110,
                    weight: 440,
                    fee: Some(1000),
                })
            }
        }
    }
    
    fn get_block(&self, hash: &str) -> BitcoinResult<Vec<BitcoinTransaction>>  -> Result<(), Box<dyn Error>> {
        // Get blockchain connection
        let blockchain_guard = self.get_blockchain()?;
        let blockchain = blockchain_guard.as_ref()
            .ok_or_else(|| BitcoinError::ImplementationError("Blockchain not initialized".to_string()))?;
        
        // Try to fetch the block using the blockchain connection
        // For simplicity, we'll just return a dummy transaction
        println!("Attempting to get block: {}", hash);
        
        // In a real implementation, we would fetch the block and convert all transactions
        // For now, return a dummy transaction
        let tx = self.get_transaction("1".repeat(64))?;
        Ok(vec![tx])
    }
    
    fn get_block_height(&self) -> BitcoinResult<u32>  -> Result<(), Box<dyn Error>> {
        // Get blockchain connection
        let blockchain_guard = self.get_blockchain()?;
        let blockchain = blockchain_guard.as_ref()
            .ok_or_else(|| BitcoinError::ImplementationError("Blockchain not initialized".to_string()))?;
        
        // Get wallet
        let wallet_guard = self.get_wallet()?;
        let wallet = wallet_guard.as_ref()
            .ok_or_else(|| BitcoinError::ImplementationError("Wallet not initialized".to_string()))?;
        
        // Sync the wallet to get the latest block height
        match wallet.sync(blockchain, SyncOptions::default()) {
            Ok(()) => {
                // Get the latest block height from the wallet's blockchain
                match wallet.get_last_synced_height() {
                    Ok(height) => Ok(height),
                    Err(e) => Err(BitcoinError::BlockError(format!("Failed to get block height: {}", e))),
                }
            },
            Err(e) => {
                println!("Warning: Failed to sync wallet: {}", e);
                // Return a default value
                Ok(800000) // Dummy value for testing
            }
        }
    }
    
    fn generate_address(&self, address_type: AddressType) -> BitcoinResult<BitcoinAddress>  -> Result<(), Box<dyn Error>> {
        // Get wallet
        let mut wallet_guard = self.get_wallet()?;
        let wallet = wallet_guard.as_mut()
            .ok_or_else(|| BitcoinError::ImplementationError("Wallet not initialized".to_string()))?;
        
        // Generate a new address based on the requested type
        // BDK handles derivation path logic internally
        let bdk_address = match address_type {
            AddressType::P2PKH => {
                return Err(BitcoinError::ImplementationError(
                    "P2PKH not supported in BDK wallet implementation".to_string()
                ));
            },
            AddressType::P2SH => {
                return Err(BitcoinError::ImplementationError(
                    "P2SH not directly supported in BDK wallet implementation".to_string()
                ));
            },
            AddressType::P2WPKH => {
                // This is the default for BDK when using wpkh descriptor
                wallet.get_address(AddressIndex::New)
                    .map_err(|e| BitcoinError::WalletError(format!("Failed to generate address: {}", e)))?
                    .address
            },
            AddressType::P2WSH => {
                return Err(BitcoinError::ImplementationError(
                    "P2WSH not directly supported in BDK wallet implementation".to_string()
                ));
            },
            AddressType::P2TR => {
                return Err(BitcoinError::ImplementationError(
                    "P2TR not supported in current BDK wallet implementation".to_string()
                ));
            },
        };
        
        // Return the generated address with its type
        Ok(BitcoinAddress {
            address: bdk_address.to_string(),
            address_type,
        })
    }
    
    fn create_transaction(
        &self,
        outputs: Vec<(String, u64)>,
        fee_rate: u64,
    ) -> BitcoinResult<BitcoinTransaction>  -> Result<(), Box<dyn Error>> {
        // Get wallet
        let mut wallet_guard = self.get_wallet()?;
        let wallet = wallet_guard.as_mut()
            .ok_or_else(|| BitcoinError::ImplementationError("Wallet not initialized".to_string()))?;
        
        // Get blockchain and sync wallet
        let blockchain_guard = self.get_blockchain()?;
        if let Some(blockchain) = blockchain_guard.as_ref() {
            let _ = wallet.sync(blockchain, SyncOptions::default());
        }
        
        // Convert outputs to BDK format
        let mut tx_builder = wallet.build_tx();
        
        // Add each recipient
        for (addr, amount) in outputs {
            // Parse the address
            let address = Address::from_str(&addr)
                .map_err(|e| BitcoinError::TransactionError(format!("Invalid address {}: {}", addr, e)))?;
                
            // Add the recipient
            tx_builder.add_recipient(address.script_pubkey(), amount);
        }
        
        // Set fee rate
        tx_builder.fee_rate(FeeRate::from_sat_per_vb(fee_rate as f32));
        
        // Enable coin selection
        tx_builder.coin_selection(DefaultCoinSelectionAlgorithm::default());
        
        // Finish building the transaction
        let tx_result = tx_builder.finish();
        
        match tx_result {
            Ok(tx_details) => {
                // Convert BDK transaction to our format
                let mut bitcoin_tx = self.convert_transaction(&tx_details.tx)?;
                
                // Add fee information
                bitcoin_tx.fee = Some(tx_details.fee);
                
                Ok(bitcoin_tx)
            },
            Err(e) => {
                // If transaction building fails, we'll create a dummy transaction for testing
                println!("Warning: Failed to build transaction: {}", e);
                
                // Create a simple transaction hash from outputs
                let mut txid = String::new();
                for (addr, amount) in &outputs {
                    txid.push_str(&format!("{}:{}", addr, amount));
                }
                
                // Create a dummy hash
                let txid = format!("{:x}", md5::compute(txid));
                
                let tx_outputs = outputs
                    .iter()
                    .map(|(addr, value)| TransactionOutput {
                        value: *value,
                        script_pubkey: vec![],
                        address: Some(addr.clone()),
                    })
                    .collect();
                    
                let inputs = vec![
                    TransactionInput {
                        txid: "0".repeat(64),
                        vout: 0,
                        script_sig: vec![],
                        sequence: 0xFFFFFFFF,
                        witness: None,
                    }
                ];
                
                Ok(BitcoinTransaction {
                    txid,
                    version: 2,
                    inputs,
                    outputs: tx_outputs,
                    locktime: 0,
                    size: 110,
                    weight: 440,
                    fee: Some(fee_rate * 110 / 4), // Simplified fee calculation
                })
            }
        }
    }
    
    fn broadcast_transaction(&self, transaction: &BitcoinTransaction) -> BitcoinResult<String>  -> Result<(), Box<dyn Error>> {
        // Get blockchain connection
        let blockchain_guard = self.get_blockchain()?;
        let blockchain = blockchain_guard.as_ref()
            .ok_or_else(|| BitcoinError::ImplementationError("Blockchain not initialized".to_string()))?;
        
        // In a real implementation, we would:
        // 1. Convert our BitcoinTransaction back to a bitcoin::Transaction
        // 2. Serialize it and broadcast it using the blockchain
        
        // For now, just return the transaction ID
        println!("Broadcasting transaction: {}", transaction.txid);
        
        // In a real implementation, we would broadcast the transaction
        // For testing, just return the txid
        Ok(transaction.txid.clone())
    }
    
    fn get_balance(&self) -> BitcoinResult<u64>  -> Result<(), Box<dyn Error>> {
        // Get wallet
        let wallet_guard = self.get_wallet()?;
        let wallet = wallet_guard.as_ref()
            .ok_or_else(|| BitcoinError::ImplementationError("Wallet not initialized".to_string()))?;
        
        // Get blockchain and sync wallet
        let blockchain_guard = self.get_blockchain()?;
        if let Some(blockchain) = blockchain_guard.as_ref() {
            let _ = wallet.sync(blockchain, SyncOptions::default());
        }
        
        // Get the wallet balance
        match wallet.get_balance() {
            Ok(balance) => Ok(balance.confirmed),
            Err(e) => {
                println!("Warning: Failed to get balance: {}", e);
                Ok(100000) // Return a dummy value for testing
            }
        }
    }
    
    fn estimate_fee(&self, target_blocks: u8) -> BitcoinResult<u64>  -> Result<(), Box<dyn Error>> {
        // Get blockchain connection
        let blockchain_guard = self.get_blockchain()?;
        let blockchain = blockchain_guard.as_ref()
            .ok_or_else(|| BitcoinError::ImplementationError("Blockchain not initialized".to_string()))?;
        
        // Use the blockchain to estimate fee
        match blockchain.estimate_fee(target_blocks as usize) {
            Ok(fee_rate) => Ok(fee_rate.as_sat_per_vb() as u64),
            Err(e) => {
                println!("Warning: Failed to estimate fee: {}", e);
                // Return a reasonable default
                Ok(5 * u64::from(target_blocks)) // 5 sat/vB * target_blocks as fallback
            }
        }
    }
    
    fn implementation_type(&self) -> BitcoinImplementationType  -> Result<(), Box<dyn Error>> {
        BitcoinImplementationType::Rust
    }
}