utxo.rs

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//
//  utxo.rs
//  marketmaker
//
//  Copyright © 2023 Pampex LTD and TillyHK LTD. All rights reserved.
//

pub mod bch;
pub(crate) mod bchd_grpc;
#[allow(clippy::all)]
#[rustfmt::skip]
#[path = "utxo/pb.rs"]
mod bchd_pb;
pub mod qtum;
pub mod rpc_clients;
pub mod slp;
pub mod spv;
pub mod swap_proto_v2_scripts;
pub mod utxo_balance_events;
pub mod utxo_block_header_storage;
pub mod utxo_builder;
pub mod utxo_common;
pub mod utxo_hd_wallet;
pub mod utxo_standard;
pub mod utxo_tx_history_v2;
pub mod utxo_withdraw;

use async_trait::async_trait;
#[cfg(not(target_arch = "wasm32"))]
use bitcoin::network::constants::Network as BitcoinNetwork;
pub use bitcrypto::{dhash160, sha256, ChecksumType};
pub use chain::Transaction as UtxoTx;
use chain::{OutPoint, TransactionOutput, TxHashAlgo};
use common::executor::abortable_queue::AbortableQueue;
#[cfg(not(target_arch = "wasm32"))]
use common::first_char_to_upper;
use common::jsonrpc_client::JsonRpcError;
use common::log::LogOnError;
use common::{now_sec, now_sec_u32};
use crypto::{Bip32Error, DerivationPath, Secp256k1ExtendedPublicKey, StandardHDPathError, StandardHDPathToCoin};
use derive_more::Display;
#[cfg(not(target_arch = "wasm32"))] use dirs::home_dir;
use futures::channel::mpsc::{Receiver as AsyncReceiver, Sender as AsyncSender, UnboundedReceiver, UnboundedSender};
use futures::compat::Future01CompatExt;
use futures::lock::{Mutex as AsyncMutex, MutexGuard as AsyncMutexGuard};
use futures01::Future;
use keys::bytes::Bytes;
use keys::NetworkAddressPrefixes;
use keys::Signature;
pub use keys::{Address, AddressBuilder, AddressFormat as UtxoAddressFormat, AddressHashEnum, AddressPrefix,
               AddressScriptType, KeyPair, LegacyAddress, Private, Public, Secret};
#[cfg(not(target_arch = "wasm32"))]
use lightning_invoice::Currency as LightningCurrency;
use mm2_core::mm_ctx::{MmArc, MmWeak};
use mm2_err_handle::prelude::*;
use mm2_metrics::MetricsArc;
use mm2_number::BigDecimal;
use mm2_rpc::data::legacy::UtxoMergeParams;
#[cfg(test)] use mocktopus::macros::*;
use num_traits::ToPrimitive;
use primitives::hash::{H160, H256, H264};
use rpc::v1::types::{Bytes as BytesJson, Transaction as RpcTransaction, H256 as H256Json};
use script::{Builder, Script, SignatureVersion, TransactionInputSigner};
use secp256k1::Signature as SecpSignature;
use serde_json::{self as json, Value as Json};
use serialization::{deserialize, serialize, serialize_with_flags, Error as SerError, SERIALIZE_TRANSACTION_WITNESS};
use spv_validation::conf::SPVConf;
use spv_validation::helpers_validation::SPVError;
use spv_validation::storage::BlockHeaderStorageError;
use std::array::TryFromSliceError;
use std::collections::{HashMap, HashSet};
use std::convert::TryInto;
use std::hash::Hash;
use std::num::{NonZeroU64, TryFromIntError};
use std::ops::Deref;
#[cfg(not(target_arch = "wasm32"))]
use std::path::{Path, PathBuf};
use std::sync::atomic::{AtomicBool, AtomicU64};
use std::sync::{Arc, Mutex, Weak};
use utxo_builder::UtxoConfBuilder;
use utxo_common::{big_decimal_from_sat, UtxoTxBuilder};
use utxo_hd_wallet::UtxoHDWallet;
use utxo_signer::with_key_pair::sign_tx;
use utxo_signer::{TxProvider, TxProviderError, UtxoSignTxError, UtxoSignTxResult};

use self::rpc_clients::{electrum_script_hash, ElectrumClient, ElectrumRpcRequest, EstimateFeeMethod, EstimateFeeMode,
                        NativeClient, UnspentInfo, UnspentMap, UtxoRpcClientEnum, UtxoRpcError, UtxoRpcFut,
                        UtxoRpcResult};
use super::{big_decimal_from_sat_unsigned, BalanceError, BalanceFut, BalanceResult, CoinBalance, CoinFutSpawner,
            CoinsContext, DerivationMethod, FeeApproxStage, FoundSwapTxSpend, HistorySyncState, KmdRewardsDetails,
            MarketCoinOps, MmCoin, NumConversError, NumConversResult, PrivKeyActivationPolicy, PrivKeyPolicy,
            PrivKeyPolicyNotAllowed, RawTransactionFut, RpcTransportEventHandler, RpcTransportEventHandlerShared,
            TradeFee, TradePreimageError, TradePreimageFut, TradePreimageResult, Transaction, TransactionDetails,
            TransactionEnum, TransactionErr, UnexpectedDerivationMethod, VerificationError, WithdrawError,
            WithdrawRequest};
use crate::coin_balance::{EnableCoinScanPolicy, EnabledCoinBalanceParams, HDAddressBalanceScanner};
use crate::hd_wallet::{HDAccountAddressId, HDAccountOps, HDAddressOps, HDWalletCoinOps, HDWalletOps,
                       HDWalletStorageError};
use crate::utxo::tx_cache::UtxoVerboseCacheShared;
use crate::{CoinAssocTypes, ToBytes};

pub mod tx_cache;

#[cfg(any(test, target_arch = "wasm32"))]
pub mod utxo_common_tests;
#[cfg(test)] pub mod utxo_tests;
#[cfg(target_arch = "wasm32")] pub mod utxo_wasm_tests;

const KILO_BYTE: u64 = 1000;
/// https://bitcoin.stackexchange.com/a/77192
const MAX_DER_SIGNATURE_LEN: usize = 72;
const COMPRESSED_PUBKEY_LEN: usize = 33;
const P2PKH_OUTPUT_LEN: u64 = 34;
const MATURE_CONFIRMATIONS_DEFAULT: u32 = 100;
const UTXO_DUST_AMOUNT: u64 = 1000;
/// Block count for KMD median time past calculation
///
/// # Safety
/// 11 > 0
const KMD_MTP_BLOCK_COUNT: NonZeroU64 = unsafe { NonZeroU64::new_unchecked(11u64) };
const DEFAULT_DYNAMIC_FEE_VOLATILITY_PERCENT: f64 = 0.5;

pub type GenerateTxResult = Result<(TransactionInputSigner, AdditionalTxData), MmError<GenerateTxError>>;
pub type HistoryUtxoTxMap = HashMap<H256Json, HistoryUtxoTx>;
pub type MatureUnspentMap = HashMap<Address, MatureUnspentList>;
pub type RecentlySpentOutPointsGuard<'a> = AsyncMutexGuard<'a, RecentlySpentOutPoints>;

pub enum ScripthashNotification {
    Triggered(String),
    SubscribeToAddresses(HashSet<Address>),
    RefreshSubscriptions,
}

pub type ScripthashNotificationSender = Option<UnboundedSender<ScripthashNotification>>;
type ScripthashNotificationHandler = Option<Arc<AsyncMutex<UnboundedReceiver<ScripthashNotification>>>>;

#[cfg(windows)]
#[cfg(not(target_arch = "wasm32"))]
fn get_special_folder_path() -> PathBuf {
    use libc::c_char;
    use std::ffi::CStr;
    use std::mem::zeroed;
    use std::ptr::null_mut;
    use winapi::shared::minwindef::MAX_PATH;
    use winapi::um::shlobj::SHGetSpecialFolderPathA;
    use winapi::um::shlobj::CSIDL_APPDATA;

    let mut buf: [c_char; MAX_PATH + 1] = unsafe { zeroed() };
    // https://docs.microsoft.com/en-us/windows/desktop/api/shlobj_core/nf-shlobj_core-shgetspecialfolderpatha
    let rc = unsafe { SHGetSpecialFolderPathA(null_mut(), buf.as_mut_ptr(), CSIDL_APPDATA, 1) };
    if rc != 1 {
        panic!("!SHGetSpecialFolderPathA")
    }
    Path::new(unsafe { CStr::from_ptr(buf.as_ptr()) }.to_str().unwrap()).to_path_buf()
}

#[cfg(not(windows))]
#[cfg(not(target_arch = "wasm32"))]
fn get_special_folder_path() -> PathBuf { panic!("!windows") }

impl Transaction for UtxoTx {
    fn tx_hex(&self) -> Vec<u8> {
        if self.has_witness() {
            serialize_with_flags(self, SERIALIZE_TRANSACTION_WITNESS).into()
        } else {
            serialize(self).into()
        }
    }

    fn tx_hash(&self) -> BytesJson { self.hash().reversed().to_vec().into() }
}

impl From<JsonRpcError> for BalanceError {
    fn from(e: JsonRpcError) -> Self { BalanceError::Transport(e.to_string()) }
}

impl From<UtxoRpcError> for BalanceError {
    fn from(e: UtxoRpcError) -> Self {
        match e {
            UtxoRpcError::Internal(desc) => BalanceError::Internal(desc),
            _ => BalanceError::Transport(e.to_string()),
        }
    }
}

impl From<keys::Error> for BalanceError {
    fn from(e: keys::Error) -> Self { BalanceError::Internal(e.to_string()) }
}

impl From<UtxoRpcError> for WithdrawError {
    fn from(e: UtxoRpcError) -> Self {
        match e {
            UtxoRpcError::Transport(transport) | UtxoRpcError::ResponseParseError(transport) => {
                WithdrawError::Transport(transport.to_string())
            },
            UtxoRpcError::InvalidResponse(resp) => WithdrawError::Transport(resp),
            UtxoRpcError::Internal(internal) => WithdrawError::InternalError(internal),
        }
    }
}

impl From<JsonRpcError> for TradePreimageError {
    fn from(e: JsonRpcError) -> Self { TradePreimageError::Transport(e.to_string()) }
}

impl From<UtxoRpcError> for TradePreimageError {
    fn from(e: UtxoRpcError) -> Self {
        match e {
            UtxoRpcError::Transport(transport) | UtxoRpcError::ResponseParseError(transport) => {
                TradePreimageError::Transport(transport.to_string())
            },
            UtxoRpcError::InvalidResponse(resp) => TradePreimageError::Transport(resp),
            UtxoRpcError::Internal(internal) => TradePreimageError::InternalError(internal),
        }
    }
}

impl From<UtxoRpcError> for TxProviderError {
    fn from(rpc: UtxoRpcError) -> Self {
        match rpc {
            resp @ UtxoRpcError::ResponseParseError(_) | resp @ UtxoRpcError::InvalidResponse(_) => {
                TxProviderError::InvalidResponse(resp.to_string())
            },
            UtxoRpcError::Transport(transport) => TxProviderError::Transport(transport.to_string()),
            UtxoRpcError::Internal(internal) => TxProviderError::Internal(internal),
        }
    }
}

impl From<StandardHDPathError> for HDWalletStorageError {
    fn from(e: StandardHDPathError) -> Self { HDWalletStorageError::ErrorDeserializing(e.to_string()) }
}

impl From<Bip32Error> for HDWalletStorageError {
    fn from(e: Bip32Error) -> Self { HDWalletStorageError::ErrorDeserializing(e.to_string()) }
}

#[async_trait]
impl TxProvider for UtxoRpcClientEnum {
    async fn get_rpc_transaction(&self, tx_hash: &H256Json) -> Result<RpcTransaction, MmError<TxProviderError>> {
        Ok(self.get_verbose_transaction(tx_hash).compat().await?)
    }
}

/// The `UtxoTx` with the block height transaction mined in.
pub struct HistoryUtxoTx {
    pub height: Option<u64>,
    pub tx: UtxoTx,
}

/// Additional transaction data that can't be easily got from raw transaction without calling
/// additional RPC methods, e.g. to get input amount we need to request all previous transactions
/// and check output values
#[derive(Debug)]
pub struct AdditionalTxData {
    pub received_by_me: u64,
    pub spent_by_me: u64,
    pub fee_amount: u64,
    pub unused_change: u64,
    pub kmd_rewards: Option<KmdRewardsDetails>,
}

/// The fee set from coins config
#[derive(Debug)]
pub enum TxFee {
    /// Tell the coin that it should request the fee from daemon RPC and calculate it relying on tx size
    Dynamic(EstimateFeeMethod),
    /// Tell the coin that it has fixed tx fee per kb.
    FixedPerKb(u64),
}

/// The actual "runtime" fee that is received from RPC in case of dynamic calculation
#[derive(Copy, Clone, Debug, PartialEq)]
pub enum ActualTxFee {
    /// fee amount per Kbyte received from coin RPC
    Dynamic(u64),
    /// Use specified amount per each 1 kb of transaction and also per each output less than amount.
    /// Used by DOGE, but more coins might support it too.
    FixedPerKb(u64),
}

/// Fee policy applied on transaction creation
pub enum FeePolicy {
    /// Send the exact amount specified in output(s), fee is added to spent input amount
    SendExact,
    /// Contains the index of output from which fee should be deducted
    DeductFromOutput(usize),
}

#[derive(Clone, Debug, Eq, Hash, PartialEq)]
pub struct CachedUnspentInfo {
    pub outpoint: OutPoint,
    pub value: u64,
}

impl From<UnspentInfo> for CachedUnspentInfo {
    fn from(unspent: UnspentInfo) -> CachedUnspentInfo {
        CachedUnspentInfo {
            outpoint: unspent.outpoint,
            value: unspent.value,
        }
    }
}

impl From<CachedUnspentInfo> for UnspentInfo {
    fn from(cached: CachedUnspentInfo) -> UnspentInfo {
        UnspentInfo {
            outpoint: cached.outpoint,
            value: cached.value,
            height: None,
        }
    }
}

/// The cache of recently send transactions used to track the spent UTXOs and replace them with new outputs
/// The daemon needs some time to update the listunspent list for address which makes it return already spent UTXOs
/// This cache helps to prevent UTXO reuse in such cases
pub struct RecentlySpentOutPoints {
    /// Maps CachedUnspentInfo A to a set of CachedUnspentInfo which `spent` A
    input_to_output_map: HashMap<CachedUnspentInfo, HashSet<CachedUnspentInfo>>,
    /// Maps CachedUnspentInfo A to a set of CachedUnspentInfo that `were spent by` A
    output_to_input_map: HashMap<CachedUnspentInfo, HashSet<CachedUnspentInfo>>,
    /// Cache includes only outputs having script_pubkey == for_script_pubkey
    for_script_pubkey: Bytes,
}

impl RecentlySpentOutPoints {
    fn new(for_script_pubkey: Bytes) -> Self {
        RecentlySpentOutPoints {
            input_to_output_map: HashMap::new(),
            output_to_input_map: HashMap::new(),
            for_script_pubkey,
        }
    }

    pub fn add_spent(&mut self, inputs: Vec<UnspentInfo>, spend_tx_hash: H256, outputs: Vec<TransactionOutput>) {
        let inputs: HashSet<_> = inputs.into_iter().map(From::from).collect();
        let to_replace: HashSet<_> = outputs
            .iter()
            .enumerate()
            .filter_map(|(index, output)| {
                if output.script_pubkey == self.for_script_pubkey {
                    Some(CachedUnspentInfo {
                        outpoint: OutPoint {
                            hash: spend_tx_hash,
                            index: index as u32,
                        },
                        value: output.value,
                    })
                } else {
                    None
                }
            })
            .collect();

        let mut prev_inputs_spent = HashSet::new();

        // check if inputs are already in spending cached chain
        for input in &inputs {
            if let Some(prev_inputs) = self.output_to_input_map.get(input) {
                for prev_input in prev_inputs {
                    if let Some(outputs) = self.input_to_output_map.get_mut(prev_input) {
                        prev_inputs_spent.insert(prev_input.clone());
                        outputs.remove(input);
                        for replace in &to_replace {
                            outputs.insert(replace.clone());
                        }
                    }
                }
            }
        }

        prev_inputs_spent.extend(inputs.clone());
        for output in &to_replace {
            self.output_to_input_map
                .insert(output.clone(), prev_inputs_spent.clone());
        }

        for input in inputs {
            self.input_to_output_map.insert(input, to_replace.clone());
        }
    }

    pub fn replace_spent_outputs_with_cache(&self, mut outputs: HashSet<UnspentInfo>) -> HashSet<UnspentInfo> {
        let mut replacement_unspents = HashSet::new();
        outputs.retain(|unspent| {
            let outs = self.input_to_output_map.get(&unspent.clone().into());
            match outs {
                Some(outs) => {
                    for out in outs.iter() {
                        if !replacement_unspents.contains(out) {
                            replacement_unspents.insert(out.clone());
                        }
                    }
                    false
                },
                None => true,
            }
        });
        if replacement_unspents.is_empty() {
            return outputs;
        }
        outputs.extend(replacement_unspents.into_iter().map(From::from));
        self.replace_spent_outputs_with_cache(outputs)
    }
}

#[derive(Clone, Debug, Deserialize, Serialize)]
pub enum BlockchainNetwork {
    #[serde(rename = "mainnet")]
    Mainnet,
    #[serde(rename = "testnet")]
    Testnet,
    #[serde(rename = "regtest")]
    Regtest,
}

#[cfg(not(target_arch = "wasm32"))]
impl From<BlockchainNetwork> for BitcoinNetwork {
    fn from(network: BlockchainNetwork) -> Self {
        match network {
            BlockchainNetwork::Mainnet => BitcoinNetwork::Bitcoin,
            BlockchainNetwork::Testnet => BitcoinNetwork::Testnet,
            BlockchainNetwork::Regtest => BitcoinNetwork::Regtest,
        }
    }
}

#[cfg(not(target_arch = "wasm32"))]
impl From<BlockchainNetwork> for LightningCurrency {
    fn from(network: BlockchainNetwork) -> Self {
        match network {
            BlockchainNetwork::Mainnet => LightningCurrency::Bitcoin,
            BlockchainNetwork::Testnet => LightningCurrency::BitcoinTestnet,
            BlockchainNetwork::Regtest => LightningCurrency::Regtest,
        }
    }
}

pub enum UtxoSyncStatus {
    SyncingBlockHeaders {
        current_scanned_block: u64,
        last_block: u64,
    },
    TemporaryError(String),
    PermanentError(String),
    Finished {
        block_number: u64,
    },
}

#[derive(Clone)]
pub struct UtxoSyncStatusLoopHandle(AsyncSender<UtxoSyncStatus>);

impl UtxoSyncStatusLoopHandle {
    pub fn new(sync_status_notifier: AsyncSender<UtxoSyncStatus>) -> Self {
        UtxoSyncStatusLoopHandle(sync_status_notifier)
    }

    pub fn notify_blocks_headers_sync_status(&mut self, current_scanned_block: u64, last_block: u64) {
        self.0
            .try_send(UtxoSyncStatus::SyncingBlockHeaders {
                current_scanned_block,
                last_block,
            })
            .debug_log_with_msg("No one seems interested in UtxoSyncStatus");
    }

    pub fn notify_on_temp_error(&mut self, error: impl ToString) {
        self.0
            .try_send(UtxoSyncStatus::TemporaryError(error.to_string()))
            .debug_log_with_msg("No one seems interested in UtxoSyncStatus");
    }

    pub fn notify_on_permanent_error(&mut self, error: impl ToString) {
        self.0
            .try_send(UtxoSyncStatus::PermanentError(error.to_string()))
            .debug_log_with_msg("No one seems interested in UtxoSyncStatus");
    }

    pub fn notify_sync_finished(&mut self, block_number: u64) {
        self.0
            .try_send(UtxoSyncStatus::Finished { block_number })
            .debug_log_with_msg("No one seems interested in UtxoSyncStatus");
    }
}

#[derive(Debug)]
pub struct UtxoCoinConf {
    pub ticker: String,
    /// https://en.bitcoin.it/wiki/List_of_address_prefixes
    /// https://github.com/jl777/coins/blob/master/coins
    pub wif_prefix: u8,
    pub address_prefixes: NetworkAddressPrefixes,
    pub sign_message_prefix: Option<String>,
    // https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki#Segwit_address_format
    pub bech32_hrp: Option<String>,
    /// True if coins uses Proof of Stake consensus algo
    /// Proof of Work is expected by default
    /// https://en.bitcoin.it/wiki/Proof_of_Stake
    /// https://en.bitcoin.it/wiki/Proof_of_work
    /// The actual meaning of this is nTime field is used in transaction
    pub is_pos: bool,
    /// Defines if coin uses PoSV transaction format (Reddcoin, Potcoin, et al).
    /// n_time field is appended to end of transaction
    pub is_posv: bool,
    /// Special field for Zcash and it's forks
    /// Defines if Overwinter network upgrade was activated
    /// https://z.cash/upgrade/overwinter/
    pub overwintered: bool,
    /// The tx version used to detect the transaction ser/de/signing algo
    /// For now it's mostly used for Zcash and forks because they changed the algo in
    /// Overwinter and then Sapling upgrades
    /// https://github.com/zcash/zips/blob/master/zip-0243.rst
    pub tx_version: i32,
    /// Defines if Segwit is enabled for this coin.
    /// https://en.bitcoin.it/wiki/Segregated_Witness
    pub segwit: bool,
    /// Does coin require transactions to be notarized to be considered as confirmed?
    /// https://komodoplatform.com/security-delayed-proof-of-work-dpow/
    pub requires_notarization: AtomicBool,
    /// The address format indicates the default address format from coin config file
    pub default_address_format: UtxoAddressFormat,
    /// Is current coin KMD asset chain?
    /// https://komodoplatform.atlassian.net/wiki/spaces/KPSD/pages/71729160/What+is+a+Parallel+Chain+Asset+Chain
    pub asset_chain: bool,
    /// Dynamic transaction fee volatility in percent. The value is used to predict a possible increase in dynamic fee.
    pub tx_fee_volatility_percent: f64,
    /// Transaction version group id for Zcash transactions since Overwinter: https://github.com/zcash/zips/blob/master/zip-0202.rst
    pub version_group_id: u32,
    /// Consensus branch id for Zcash transactions since Overwinter: https://github.com/zcash/zcash/blob/master/src/consensus/upgrades.cpp#L11
    /// used in transaction sig hash calculation
    pub consensus_branch_id: u32,
    /// Defines if coin uses Zcash transaction format
    pub zcash: bool,
    /// Address and privkey checksum type
    pub checksum_type: ChecksumType,
    /// Fork id used in sighash
    pub fork_id: u32,
    /// Signature version
    pub signature_version: SignatureVersion,
    pub required_confirmations: AtomicU64,
    /// if set to true MM2 will check whether calculated fee is lower than relay fee and use
    /// relay fee amount instead of calculated
    /// https://github.com/KomodoPlatform/atomicDEX-API/issues/617
    pub force_min_relay_fee: bool,
    /// Block count for median time past calculation
    pub mtp_block_count: NonZeroU64,
    pub estimate_fee_mode: Option<EstimateFeeMode>,
    /// The minimum number of confirmations at which a transaction is considered mature
    pub mature_confirmations: u32,
    /// The number of blocks used for estimate_fee/estimate_smart_fee RPC calls
    pub estimate_fee_blocks: u32,
    /// The name of the coin with which Trezor wallet associates this asset.
    pub trezor_coin: Option<String>,
    /// Whether to verify swaps and lightning transactions using spv or not. When enabled, block headers will be retrieved, verified according
    /// to [`SPVConf::validation_params`] and stored in the DB. Can be false if the coin's RPC server is trusted.
    pub spv_conf: Option<SPVConf>,
    /// Derivation path of the coin.
    /// This derivation path consists of `purpose` and `coin_type` only
    /// where the full `BIP44` address has the following structure:
    /// `m/purpose'/coin_type'/account'/change/address_index`.
    pub derivation_path: Option<StandardHDPathToCoin>,
    /// The average time in seconds needed to mine a new block for this coin.
    pub avg_blocktime: Option<u64>,
}

pub struct UtxoCoinFields {
    /// UTXO coin config
    pub conf: UtxoCoinConf,
    /// Default decimals amount is 8 (BTC and almost all other UTXO coins)
    /// But there are forks which have different decimals:
    /// Peercoin has 6
    /// Emercoin has 6
    /// Bitcoin Diamond has 7
    pub decimals: u8,
    pub tx_fee: TxFee,
    /// Minimum transaction value at which the value is not less than fee
    pub dust_amount: u64,
    /// RPC client
    pub rpc_client: UtxoRpcClientEnum,
    /// Either ECDSA key pair or a Hardware Wallet info.
    pub priv_key_policy: PrivKeyPolicy<KeyPair>,
    /// Either an Iguana address or a 'UtxoHDWallet' instance.
    pub derivation_method: DerivationMethod<Address, UtxoHDWallet>,
    pub history_sync_state: Mutex<HistorySyncState>,
    /// The cache of verbose transactions.
    pub tx_cache: UtxoVerboseCacheShared,
    /// The cache of recently send transactions used to track the spent UTXOs and replace them with new outputs
    /// The daemon needs some time to update the listunspent list for address which makes it return already spent UTXOs
    /// This cache helps to prevent UTXO reuse in such cases
    pub recently_spent_outpoints: AsyncMutex<RecentlySpentOutPoints>,
    pub tx_hash_algo: TxHashAlgo,
    /// The flag determines whether to use mature unspent outputs *only* to generate transactions.
    /// https://github.com/KomodoPlatform/atomicDEX-API/issues/1181
    pub check_utxo_maturity: bool,
    /// The notifier/sender of the block headers synchronization status,
    /// initialized only for non-native mode if spv is enabled for the coin.
    pub block_headers_status_notifier: Option<UtxoSyncStatusLoopHandle>,
    /// The watcher/receiver of the block headers synchronization status,
    /// initialized only for non-native mode if spv is enabled for the coin.
    pub block_headers_status_watcher: Option<AsyncMutex<AsyncReceiver<UtxoSyncStatus>>>,
    /// This abortable system is used to spawn coin's related futures that should be aborted on coin deactivation
    /// and on [`MmArc::stop`].
    pub abortable_system: AbortableQueue,
    pub(crate) ctx: MmWeak,
    /// This is used for balance event streaming implementation for UTXOs.
    /// If balance event streaming isn't enabled, this value will always be `None`; otherwise,
    /// it will be used for receiving scripthash notifications to re-fetch balances.
    scripthash_notification_handler: ScripthashNotificationHandler,
}

#[derive(Debug, Display)]
pub enum UnsupportedAddr {
    #[display(
        fmt = "{} address format activated for {}, but {} format used instead",
        activated_format,
        ticker,
        used_format
    )]
    FormatMismatch {
        ticker: String,
        activated_format: String,
        used_format: String,
    },
    #[display(fmt = "Expected a valid P2PKH or P2SH prefix for {}", _0)]
    PrefixError(String),
    #[display(fmt = "Address hrp {} is not a valid hrp for {}", hrp, ticker)]
    HrpError { ticker: String, hrp: String },
    #[display(fmt = "Segwit not activated in the config for {}", _0)]
    SegwitNotActivated(String),
    #[display(fmt = "Internal error {}", _0)]
    InternalError(String),
}

impl From<UnsupportedAddr> for WithdrawError {
    fn from(e: UnsupportedAddr) -> Self { WithdrawError::InvalidAddress(e.to_string()) }
}

impl From<keys::Error> for UnsupportedAddr {
    fn from(e: keys::Error) -> Self { UnsupportedAddr::InternalError(e.to_string()) }
}

#[derive(Debug)]
#[allow(clippy::large_enum_variant)]
pub enum GetTxError {
    Rpc(UtxoRpcError),
    TxDeserialization(SerError),
}

impl From<UtxoRpcError> for GetTxError {
    fn from(err: UtxoRpcError) -> GetTxError { GetTxError::Rpc(err) }
}

impl From<SerError> for GetTxError {
    fn from(err: SerError) -> GetTxError { GetTxError::TxDeserialization(err) }
}

#[derive(Debug, Display)]
pub enum GetTxHeightError {
    HeightNotFound(String),
    StorageError(BlockHeaderStorageError),
    ConversionError(TryFromIntError),
}

impl From<GetTxHeightError> for SPVError {
    fn from(e: GetTxHeightError) -> Self {
        match e {
            GetTxHeightError::HeightNotFound(e) => SPVError::InvalidHeight(e),
            GetTxHeightError::StorageError(e) => SPVError::HeaderStorageError(e),
            GetTxHeightError::ConversionError(e) => SPVError::Internal(e.to_string()),
        }
    }
}

impl From<UtxoRpcError> for GetTxHeightError {
    fn from(e: UtxoRpcError) -> Self { GetTxHeightError::HeightNotFound(e.to_string()) }
}

impl From<BlockHeaderStorageError> for GetTxHeightError {
    fn from(e: BlockHeaderStorageError) -> Self { GetTxHeightError::StorageError(e) }
}

impl From<TryFromIntError> for GetTxHeightError {
    fn from(err: TryFromIntError) -> GetTxHeightError { GetTxHeightError::ConversionError(err) }
}

#[derive(Debug, Display)]
pub enum GetBlockHeaderError {
    #[display(fmt = "Block header storage error: {}", _0)]
    StorageError(BlockHeaderStorageError),
    #[display(fmt = "RPC error: {}", _0)]
    RpcError(JsonRpcError),
    #[display(fmt = "Serialization error: {}", _0)]
    SerializationError(serialization::Error),
    #[display(fmt = "Invalid response: {}", _0)]
    InvalidResponse(String),
    #[display(fmt = "Error validating headers: {}", _0)]
    SPVError(SPVError),
    #[display(fmt = "Internal error: {}", _0)]
    Internal(String),
}

impl From<JsonRpcError> for GetBlockHeaderError {
    fn from(err: JsonRpcError) -> Self { GetBlockHeaderError::RpcError(err) }
}

impl From<UtxoRpcError> for GetBlockHeaderError {
    fn from(e: UtxoRpcError) -> Self {
        match e {
            UtxoRpcError::Transport(e) | UtxoRpcError::ResponseParseError(e) => GetBlockHeaderError::RpcError(e),
            UtxoRpcError::InvalidResponse(e) => GetBlockHeaderError::InvalidResponse(e),
            UtxoRpcError::Internal(e) => GetBlockHeaderError::Internal(e),
        }
    }
}

impl From<serialization::Error> for GetBlockHeaderError {
    fn from(err: serialization::Error) -> Self { GetBlockHeaderError::SerializationError(err) }
}

impl From<BlockHeaderStorageError> for GetBlockHeaderError {
    fn from(err: BlockHeaderStorageError) -> Self { GetBlockHeaderError::StorageError(err) }
}

impl From<GetBlockHeaderError> for SPVError {
    fn from(e: GetBlockHeaderError) -> Self { SPVError::UnableToGetHeader(e.to_string()) }
}

#[derive(Debug, Display)]
pub enum GetConfirmedTxError {
    HeightNotFound(GetTxHeightError),
    UnableToGetHeader(GetBlockHeaderError),
    RpcError(JsonRpcError),
    SerializationError(serialization::Error),
    SPVError(SPVError),
}

impl From<GetTxHeightError> for GetConfirmedTxError {
    fn from(err: GetTxHeightError) -> Self { GetConfirmedTxError::HeightNotFound(err) }
}

impl From<GetBlockHeaderError> for GetConfirmedTxError {
    fn from(err: GetBlockHeaderError) -> Self { GetConfirmedTxError::UnableToGetHeader(err) }
}

impl From<JsonRpcError> for GetConfirmedTxError {
    fn from(err: JsonRpcError) -> Self { GetConfirmedTxError::RpcError(err) }
}

impl From<serialization::Error> for GetConfirmedTxError {
    fn from(err: serialization::Error) -> Self { GetConfirmedTxError::SerializationError(err) }
}

#[derive(Debug, Display)]
pub enum AddrFromStrError {
    #[display(fmt = "{}", _0)]
    Unsupported(UnsupportedAddr),
    #[display(fmt = "Cannot determine format: {:?}", _0)]
    CannotDetermineFormat(Vec<String>),
}

impl From<UnsupportedAddr> for AddrFromStrError {
    fn from(e: UnsupportedAddr) -> Self { AddrFromStrError::Unsupported(e) }
}

impl From<AddrFromStrError> for VerificationError {
    fn from(e: AddrFromStrError) -> Self { VerificationError::AddressDecodingError(e.to_string()) }
}

impl From<AddrFromStrError> for WithdrawError {
    fn from(e: AddrFromStrError) -> Self { WithdrawError::InvalidAddress(e.to_string()) }
}

impl UtxoCoinFields {
    pub fn transaction_preimage(&self) -> TransactionInputSigner {
        let lock_time = if self.conf.ticker == "KMD" {
            now_sec_u32() - 3600 + 777 * 2
        } else {
            now_sec_u32()
        };

        let str_d_zeel = if self.conf.ticker == "NAV" {
            Some("".into())
        } else {
            None
        };

        let n_time = if self.conf.is_pos || self.conf.is_posv {
            Some(now_sec_u32())
        } else {
            None
        };

        TransactionInputSigner {
            version: self.conf.tx_version,
            n_time,
            overwintered: self.conf.overwintered,
            version_group_id: self.conf.version_group_id,
            consensus_branch_id: self.conf.consensus_branch_id,
            expiry_height: 0,
            value_balance: 0,
            inputs: vec![],
            outputs: vec![],
            lock_time,
            join_splits: vec![],
            shielded_spends: vec![],
            shielded_outputs: vec![],
            zcash: self.conf.zcash,
            posv: self.conf.is_posv,
            str_d_zeel,
            hash_algo: self.tx_hash_algo.into(),
        }
    }
}

#[derive(Debug, Display)]
#[allow(clippy::large_enum_variant)]
pub enum BroadcastTxErr {
    /// RPC client error
    Rpc(UtxoRpcError),
    /// Other specific error
    Other(String),
}

impl From<UtxoRpcError> for BroadcastTxErr {
    fn from(err: UtxoRpcError) -> Self { BroadcastTxErr::Rpc(err) }
}

#[async_trait]
#[cfg_attr(test, mockable)]
pub trait UtxoTxBroadcastOps {
    async fn broadcast_tx(&self, tx: &UtxoTx) -> Result<H256Json, MmError<BroadcastTxErr>>;
}

#[async_trait]
#[cfg_attr(test, mockable)]
pub trait UtxoTxGenerationOps {
    async fn get_tx_fee(&self) -> UtxoRpcResult<ActualTxFee>;

    /// Calculates interest if the coin is KMD
    /// Adds the value to existing output to my_script_pub or creates additional interest output
    /// returns transaction and data as is if the coin is not KMD
    async fn calc_interest_if_required(
        &self,
        mut unsigned: TransactionInputSigner,
        mut data: AdditionalTxData,
        my_script_pub: Bytes,
        dust: u64,
    ) -> UtxoRpcResult<(TransactionInputSigner, AdditionalTxData)>;
}

/// The UTXO address balance scanner.
/// If the coin is initialized with a native RPC client, it's better to request the list of used addresses
/// right on `UtxoAddressBalanceScanner` initialization.
/// See [`NativeClientImpl::list_transactions`].
pub enum UtxoAddressScanner {
    Native { non_empty_addresses: HashSet<String> },
    Electrum(ElectrumClient),
}

#[async_trait]
#[cfg_attr(test, mockable)]
impl HDAddressBalanceScanner for UtxoAddressScanner {
    type Address = Address;

    async fn is_address_used(&self, address: &Self::Address) -> BalanceResult<bool> {
        let is_used = match self {
            UtxoAddressScanner::Native { non_empty_addresses } => non_empty_addresses.contains(&address.to_string()),
            UtxoAddressScanner::Electrum(electrum_client) => {
                let script = output_script(address)?;
                let script_hash = electrum_script_hash(&script);

                let electrum_history = electrum_client
                    .scripthash_get_history(&hex::encode(script_hash))
                    .compat()
                    .await?;

                !electrum_history.is_empty()
            },
        };
        Ok(is_used)
    }
}

impl UtxoAddressScanner {
    pub async fn init(rpc_client: UtxoRpcClientEnum) -> UtxoRpcResult<UtxoAddressScanner> {
        match rpc_client {
            UtxoRpcClientEnum::Native(native) => UtxoAddressScanner::init_with_native_client(&native).await,
            UtxoRpcClientEnum::Electrum(electrum) => Ok(UtxoAddressScanner::Electrum(electrum)),
        }
    }

    pub async fn init_with_native_client(native: &NativeClient) -> UtxoRpcResult<UtxoAddressScanner> {
        const STEP: u64 = 100;

        let non_empty_addresses = native
            .list_all_transactions(STEP)
            .compat()
            .await?
            .into_iter()
            .map(|tx_item| tx_item.address)
            .collect();
        Ok(UtxoAddressScanner::Native { non_empty_addresses })
    }
}

/// Contains lists of mature and immature UTXOs.
#[derive(Debug, Default)]
pub struct MatureUnspentList {
    mature: Vec<UnspentInfo>,
    immature: Vec<UnspentInfo>,
}

impl MatureUnspentList {
    #[inline]
    pub fn with_capacity(capacity: usize) -> MatureUnspentList {
        MatureUnspentList {
            mature: Vec::with_capacity(capacity),
            immature: Vec::with_capacity(capacity),
        }
    }

    #[inline]
    pub fn new_mature(mature: Vec<UnspentInfo>) -> MatureUnspentList {
        MatureUnspentList {
            mature,
            immature: Vec::new(),
        }
    }

    #[inline]
    pub fn only_mature(self) -> Vec<UnspentInfo> { self.mature }

    #[inline]
    pub fn to_coin_balance(&self, decimals: u8) -> CoinBalance {
        let fold = |acc: BigDecimal, x: &UnspentInfo| acc + big_decimal_from_sat_unsigned(x.value, decimals);
        CoinBalance {
            spendable: self.mature.iter().fold(BigDecimal::default(), fold),
            unspendable: self.immature.iter().fold(BigDecimal::default(), fold),
        }
    }
}

#[async_trait]
#[cfg_attr(test, mockable)]
pub trait UtxoCommonOps:
    AsRef<UtxoCoinFields> + UtxoTxGenerationOps + UtxoTxBroadcastOps + Clone + Send + Sync + 'static
{
    async fn get_htlc_spend_fee(&self, tx_size: u64, stage: &FeeApproxStage) -> UtxoRpcResult<u64>;

    fn addresses_from_script(&self, script: &Script) -> Result<Vec<Address>, String>;

    fn denominate_satoshis(&self, satoshi: i64) -> f64;

    /// Get a public key that matches [`PrivKeyPolicy::Iguana`].
    ///
    /// # Fail
    ///
    /// The method is expected to fail if [`UtxoCoinFields::priv_key_policy`] is [`PrivKeyPolicy::HardwareWallet`].
    /// It's worth adding a method like `my_public_key_der_path`
    /// that takes a derivation path from which we derive the corresponding public key.
    fn my_public_key(&self) -> Result<&Public, MmError<UnexpectedDerivationMethod>>;

    /// Try to parse address from string using specified on asset enable format,
    /// and if it failed inform user that he used a wrong format.
    fn address_from_str(&self, address: &str) -> MmResult<Address, AddrFromStrError>;

    /// For an address create corresponding utxo output script
    fn script_for_address(&self, address: &Address) -> MmResult<Script, UnsupportedAddr>;

    async fn get_current_mtp(&self) -> UtxoRpcResult<u32>;

    /// Check if the output is spendable (is not coinbase or it has enough confirmations).
    fn is_unspent_mature(&self, output: &RpcTransaction) -> bool;

    /// Calculates interest of the specified transaction.
    /// Please note, this method has to be used for KMD transactions only.
    async fn calc_interest_of_tx(&self, tx: &UtxoTx, input_transactions: &mut HistoryUtxoTxMap) -> UtxoRpcResult<u64>;

    /// Try to get a `HistoryUtxoTx` transaction from `utxo_tx_map` or try to request it from Rpc client.
    async fn get_mut_verbose_transaction_from_map_or_rpc<'a, 'b>(
        &'a self,
        tx_hash: H256Json,
        utxo_tx_map: &'b mut HistoryUtxoTxMap,
    ) -> UtxoRpcResult<&'b mut HistoryUtxoTx>;

    /// Generates a transaction spending P2SH vout (typically, with 0 index [`utxo_common::DEFAULT_SWAP_VOUT`]) of input.prev_transaction
    /// Works only if single signature is required!
    async fn p2sh_spending_tx(&self, input: utxo_common::P2SHSpendingTxInput<'_>) -> Result<UtxoTx, String>;

    /// Loads verbose transactions from cache or requests it using RPC client.
    fn get_verbose_transactions_from_cache_or_rpc(
        &self,
        tx_ids: HashSet<H256Json>,
    ) -> UtxoRpcFut<HashMap<H256Json, VerboseTransactionFrom>>;

    async fn preimage_trade_fee_required_to_send_outputs(
        &self,
        outputs: Vec<TransactionOutput>,
        fee_policy: FeePolicy,
        gas_fee: Option<u64>,
        stage: &FeeApproxStage,
    ) -> TradePreimageResult<BigDecimal>;

    /// Increase the given `dynamic_fee` according to the fee approximation `stage`.
    /// The method is used to predict a possible increase in dynamic fee.
    fn increase_dynamic_fee_by_stage(&self, dynamic_fee: u64, stage: &FeeApproxStage) -> u64;

    async fn p2sh_tx_locktime(&self, htlc_locktime: u32) -> Result<u32, MmError<UtxoRpcError>>;

    fn addr_format(&self) -> &UtxoAddressFormat;

    fn addr_format_for_standard_scripts(&self) -> UtxoAddressFormat;

    fn address_from_pubkey(&self, pubkey: &Public) -> Address;
}

impl ToBytes for UtxoTx {
    fn to_bytes(&self) -> Vec<u8> { self.tx_hex() }
}

impl ToBytes for Signature {
    fn to_bytes(&self) -> Vec<u8> { self.to_vec() }
}

#[async_trait]
impl<T: UtxoCommonOps> CoinAssocTypes for T {
    type Address = Address;
    type AddressParseError = MmError<AddrFromStrError>;
    type Pubkey = Public;
    type PubkeyParseError = MmError<keys::Error>;
    type Tx = UtxoTx;
    type TxParseError = MmError<serialization::Error>;
    type Preimage = UtxoTx;
    type PreimageParseError = MmError<serialization::Error>;
    type Sig = Signature;
    type SigParseError = MmError<secp256k1::Error>;

    async fn my_addr(&self) -> Self::Address {
        match &self.as_ref().derivation_method {
            DerivationMethod::SingleAddress(addr) => addr.clone(),
            // Todo: Expect should not fail but we need to handle it properly
            DerivationMethod::HDWallet(hd_wallet) => hd_wallet
                .get_enabled_address()
                .await
                .expect("Getting enabled address should not fail!")
                .address(),
        }
    }

    fn parse_address(&self, address: &str) -> Result<Self::Address, Self::AddressParseError> {
        self.address_from_str(address)
    }

    #[inline]
    fn parse_pubkey(&self, pubkey: &[u8]) -> Result<Self::Pubkey, Self::PubkeyParseError> {
        Public::from_slice(pubkey).map_err(MmError::from)
    }

    #[inline]
    fn parse_tx(&self, tx: &[u8]) -> Result<Self::Tx, Self::TxParseError> {
        let mut tx: UtxoTx = deserialize(tx)?;
        tx.tx_hash_algo = self.as_ref().tx_hash_algo;
        Ok(tx)
    }

    #[inline]
    fn parse_preimage(&self, tx: &[u8]) -> Result<Self::Preimage, Self::PreimageParseError> { self.parse_tx(tx) }

    fn parse_signature(&self, sig: &[u8]) -> Result<Self::Sig, Self::SigParseError> {
        SecpSignature::from_der(sig)?;
        Ok(sig.into())
    }
}

#[async_trait]
#[cfg_attr(test, mockable)]
pub trait GetUtxoListOps {
    /// Returns available unspents in ascending order
    /// + `RecentlySpentOutPoints` MutexGuard for further interaction (e.g. to add new transaction to it).
    /// The function uses either [`GetUtxoListOps::get_all_unspent_ordered_list`] or [`GetUtxoListOps::get_mature_unspent_ordered_list`]
    /// depending on the coin configuration.
    async fn get_unspent_ordered_list(
        &self,
        address: &Address,
    ) -> UtxoRpcResult<(Vec<UnspentInfo>, RecentlySpentOutPointsGuard<'_>)>;

    /// Returns available unspents in ascending order
    /// + `RecentlySpentOutPoints` MutexGuard for further interaction (e.g. to add new transaction to it).
    ///
    /// # Important
    ///
    /// The function doesn't check if the unspents are mature or immature.
    /// Consider using [`GetUtxoListOps::get_unspent_ordered_list`] instead.
    async fn get_all_unspent_ordered_list(
        &self,
        address: &Address,
    ) -> UtxoRpcResult<(Vec<UnspentInfo>, RecentlySpentOutPointsGuard<'_>)>;

    /// Returns available mature and immature unspents in ascending order
    /// + `RecentlySpentOutPoints` MutexGuard for further interaction (e.g. to add new transaction to it).
    ///
    /// # Important
    ///
    /// The function may request extra data using RPC to check each unspent output whether it's mature or not.
    /// It may be overhead in some cases, so consider using [`GetUtxoListOps::get_unspent_ordered_list`] instead.
    async fn get_mature_unspent_ordered_list(
        &self,
        address: &Address,
    ) -> UtxoRpcResult<(MatureUnspentList, RecentlySpentOutPointsGuard<'_>)>;
}

#[async_trait]
#[cfg_attr(test, mockable)]
pub trait GetUtxoMapOps {
    /// Returns available unspents in ascending order for every given `addresses`
    /// + `RecentlySpentOutPoints` MutexGuard for further interaction (e.g. to add new transaction to it).
    /// The function uses either [`GetUtxoMapOps::get_all_unspent_ordered_map`] or [`GetUtxoMapOps::get_mature_unspent_ordered_map`]
    /// depending on the coin configuration.
    async fn get_unspent_ordered_map(
        &self,
        addresses: Vec<Address>,
    ) -> UtxoRpcResult<(UnspentMap, RecentlySpentOutPointsGuard<'_>)>;

    /// Returns available unspents in ascending order for every given `addresses`
    /// + `RecentlySpentOutPoints` MutexGuard for further interaction (e.g. to add new transaction to it).
    ///
    /// # Important
    ///
    /// The function doesn't check if the unspents are mature or immature.
    /// Consider using [`GetUtxoMapOps::get_unspent_ordered_map`] instead.
    async fn get_all_unspent_ordered_map(
        &self,
        addresses: Vec<Address>,
    ) -> UtxoRpcResult<(UnspentMap, RecentlySpentOutPointsGuard<'_>)>;

    /// Returns available mature and immature unspents in ascending order for every given `addresses`
    /// + `RecentlySpentOutPoints` MutexGuard for further interaction (e.g. to add new transaction to it).
    ///
    /// # Important
    ///
    /// The function may request extra data using RPC to check each unspent output whether it's mature or not.
    /// It may be overhead in some cases, so consider using [`GetUtxoMapOps::get_unspent_ordered_map`] instead.
    async fn get_mature_unspent_ordered_map(
        &self,
        addresses: Vec<Address>,
    ) -> UtxoRpcResult<(MatureUnspentMap, RecentlySpentOutPointsGuard<'_>)>;
}

#[async_trait]
pub trait UtxoStandardOps {
    /// Gets tx details by hash requesting the coin RPC if required.
    /// * `input_transactions` - the cache of the already requested transactions.
    async fn tx_details_by_hash(
        &self,
        hash: &[u8],
        input_transactions: &mut HistoryUtxoTxMap,
    ) -> Result<TransactionDetails, String>;

    async fn request_tx_history(&self, metrics: MetricsArc) -> RequestTxHistoryResult;

    /// Calculate the KMD rewards and re-calculate the transaction fee
    /// if the specified `tx_details` was generated without considering the KMD rewards.
    /// Please note, this method has to be used for KMD transactions only.
    async fn update_kmd_rewards(
        &self,
        tx_details: &mut TransactionDetails,
        input_transactions: &mut HistoryUtxoTxMap,
    ) -> UtxoRpcResult<()>;
}

#[derive(Clone)]
pub struct UtxoArc(Arc<UtxoCoinFields>);
impl Deref for UtxoArc {
    type Target = UtxoCoinFields;
    fn deref(&self) -> &UtxoCoinFields { &self.0 }
}

impl From<UtxoCoinFields> for UtxoArc {
    fn from(coin: UtxoCoinFields) -> UtxoArc { UtxoArc::new(coin) }
}

impl From<Arc<UtxoCoinFields>> for UtxoArc {
    fn from(arc: Arc<UtxoCoinFields>) -> UtxoArc { UtxoArc(arc) }
}

impl UtxoArc {
    pub fn new(fields: UtxoCoinFields) -> UtxoArc { UtxoArc(Arc::new(fields)) }

    pub fn with_arc(inner: Arc<UtxoCoinFields>) -> UtxoArc { UtxoArc(inner) }

    /// Returns weak reference to the inner UtxoCoinFields
    pub fn downgrade(&self) -> UtxoWeak {
        let weak = Arc::downgrade(&self.0);
        UtxoWeak(weak)
    }
}

#[derive(Clone)]
pub struct UtxoWeak(Weak<UtxoCoinFields>);

impl From<Weak<UtxoCoinFields>> for UtxoWeak {
    fn from(weak: Weak<UtxoCoinFields>) -> Self { UtxoWeak(weak) }
}

impl UtxoWeak {
    pub fn upgrade(&self) -> Option<UtxoArc> { self.0.upgrade().map(UtxoArc::from) }
}

// We can use a shared UTXO lock for all UTXO coins at 1 time.
// It's highly likely that we won't experience any issues with it as we won't need to send "a lot" of transactions concurrently.
lazy_static! {
    pub static ref UTXO_LOCK: AsyncMutex<()> = AsyncMutex::new(());
}

#[derive(Debug, Display)]
pub enum GenerateTxError {
    #[display(
        fmt = "Couldn't generate tx from empty UTXOs set, required no less than {} satoshis",
        required
    )]
    EmptyUtxoSet { required: u64 },
    #[display(fmt = "Couldn't generate tx with empty output set")]
    EmptyOutputs,
    #[display(fmt = "Output value {} less than dust {}", value, dust)]
    OutputValueLessThanDust { value: u64, dust: u64 },
    #[display(
        fmt = "Output {} value {} is too small, required no less than {}",
        output_idx,
        output_value,
        required
    )]
    DeductFeeFromOutputFailed {
        output_idx: usize,
        output_value: u64,
        required: u64,
    },
    #[display(
        fmt = "Sum of input values {} is too small, required no less than {}",
        sum_utxos,
        required
    )]
    NotEnoughUtxos { sum_utxos: u64, required: u64 },
    #[display(fmt = "Transport error: {}", _0)]
    Transport(String),
    #[display(fmt = "Internal error: {}", _0)]
    Internal(String),
}

impl From<JsonRpcError> for GenerateTxError {
    fn from(rpc_err: JsonRpcError) -> Self { GenerateTxError::Transport(rpc_err.to_string()) }
}

impl From<UtxoRpcError> for GenerateTxError {
    fn from(e: UtxoRpcError) -> Self {
        match e {
            UtxoRpcError::Transport(rpc) | UtxoRpcError::ResponseParseError(rpc) => {
                GenerateTxError::Transport(rpc.to_string())
            },
            UtxoRpcError::InvalidResponse(error) => GenerateTxError::Transport(error),
            UtxoRpcError::Internal(error) => GenerateTxError::Internal(error),
        }
    }
}

impl From<NumConversError> for GenerateTxError {
    fn from(e: NumConversError) -> Self { GenerateTxError::Internal(e.to_string()) }
}

impl From<keys::Error> for GenerateTxError {
    fn from(e: keys::Error) -> Self { GenerateTxError::Internal(e.to_string()) }
}

pub enum RequestTxHistoryResult {
    Ok(Vec<(H256Json, u64)>),
    Retry { error: String },
    HistoryTooLarge,
    CriticalError(String),
}

#[derive(Clone)]
pub enum VerboseTransactionFrom {
    Cache(RpcTransaction),
    Rpc(RpcTransaction),
}

impl VerboseTransactionFrom {
    #[inline]
    fn to_inner(&self) -> &RpcTransaction {
        match self {
            VerboseTransactionFrom::Rpc(tx) | VerboseTransactionFrom::Cache(tx) => tx,
        }
    }

    #[inline]
    pub fn into_inner(self) -> RpcTransaction {
        match self {
            VerboseTransactionFrom::Rpc(tx) | VerboseTransactionFrom::Cache(tx) => tx,
        }
    }
}

pub fn compressed_key_pair_from_bytes(raw: &[u8], prefix: u8, checksum_type: ChecksumType) -> Result<KeyPair, String> {
    if raw.len() != 32 {
        return ERR!("Invalid raw priv key len {}", raw.len());
    }

    let private = Private {
        prefix,
        compressed: true,
        secret: Secret::from(raw),
        checksum_type,
    };
    Ok(try_s!(KeyPair::from_private(private)))
}

pub fn compressed_pub_key_from_priv_raw(raw_priv: &[u8], sum_type: ChecksumType) -> Result<H264, String> {
    let key_pair: KeyPair = try_s!(compressed_key_pair_from_bytes(raw_priv, 0, sum_type));
    Ok(H264::from(&**key_pair.public()))
}

#[derive(Clone, Debug, Deserialize, PartialEq, Serialize)]
pub struct UtxoFeeDetails {
    pub coin: Option<String>,
    pub amount: BigDecimal,
}

#[cfg(not(target_arch = "wasm32"))]
// https://github.com/KomodoPlatform/komodo/blob/master/zcutil/fetch-params.sh#L5
// https://github.com/KomodoPlatform/komodo/blob/master/zcutil/fetch-params.bat#L4
pub fn zcash_params_path() -> PathBuf {
    if cfg!(windows) {
        // >= Vista: c:\Users\$username\AppData\Roaming
        get_special_folder_path().join("ZcashParams")
    } else if cfg!(target_os = "macos") {
        home_dir()
            .unwrap()
            .join("Library")
            .join("Application Support")
            .join("ZcashParams")
    } else {
        home_dir().unwrap().join(".zcash-params")
    }
}

#[cfg(not(target_arch = "wasm32"))]
pub fn coin_daemon_data_dir(name: &str, is_asset_chain: bool) -> PathBuf {
    // komodo/util.cpp/GetDefaultDataDir
    let mut data_dir = match dirs::home_dir() {
        Some(hd) => hd,
        None => Path::new("/").to_path_buf(),
    };

    if cfg!(windows) {
        // >= Vista: c:\Users\$username\AppData\Roaming
        data_dir = get_special_folder_path();
        if is_asset_chain {
            data_dir.push("Komodo");
        } else {
            data_dir.push(first_char_to_upper(name));
        }
    } else if cfg!(target_os = "macos") {
        data_dir.push("Library");
        data_dir.push("Application Support");
        if is_asset_chain {
            data_dir.push("Komodo");
        } else {
            data_dir.push(first_char_to_upper(name));
        }
    } else if is_asset_chain {
        data_dir.push(".komodo");
    } else {
        data_dir.push(format!(".{}", name));
    }

    if is_asset_chain {
        data_dir.push(name)
    };
    data_dir
}

enum ElectrumProtoVerifierEvent {
    Connected(String),
    Disconnected(String),
}

/// Electrum protocol version verifier.
/// The structure is used to handle the `on_connected` event and notify `electrum_version_loop`.
struct ElectrumProtoVerifier {
    on_event_tx: UnboundedSender<ElectrumProtoVerifierEvent>,
}

impl ElectrumProtoVerifier {
    fn into_shared(self) -> RpcTransportEventHandlerShared { Arc::new(self) }
}

impl RpcTransportEventHandler for ElectrumProtoVerifier {
    fn debug_info(&self) -> String { "ElectrumProtoVerifier".into() }

    fn on_outgoing_request(&self, _data: &[u8]) {}

    fn on_incoming_response(&self, _data: &[u8]) {}

    fn on_connected(&self, address: String) -> Result<(), String> {
        try_s!(self
            .on_event_tx
            .unbounded_send(ElectrumProtoVerifierEvent::Connected(address)));
        Ok(())
    }

    fn on_disconnected(&self, address: String) -> Result<(), String> {
        try_s!(self
            .on_event_tx
            .unbounded_send(ElectrumProtoVerifierEvent::Disconnected(address)));
        Ok(())
    }
}

#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct UtxoActivationParams {
    pub mode: UtxoRpcMode,
    pub utxo_merge_params: Option<UtxoMergeParams>,
    #[serde(default)]
    pub tx_history: bool,
    pub required_confirmations: Option<u64>,
    pub requires_notarization: Option<bool>,
    pub address_format: Option<UtxoAddressFormat>,
    // The max number of empty addresses in a row.
    // If transactions were sent to an address outside the `gap_limit`, they will not be identified.
    pub gap_limit: Option<u32>,
    #[serde(flatten)]
    pub enable_params: EnabledCoinBalanceParams,
    #[serde(default)]
    pub priv_key_policy: PrivKeyActivationPolicy,
    /// The flag determines whether to use mature unspent outputs *only* to generate transactions.
    /// https://github.com/KomodoPlatform/atomicDEX-API/issues/1181
    pub check_utxo_maturity: Option<bool>,
    /// This determines which Address of the HD account to be used for swaps for this UTXO coin.
    /// If not specified, the first non-change address for the first account is used.
    #[serde(default)]
    pub path_to_address: HDAccountAddressId,
}

#[derive(Debug, Display)]
pub enum UtxoFromLegacyReqErr {
    UnexpectedMethod,
    InvalidElectrumServers(json::Error),
    InvalidMergeParams(json::Error),
    InvalidBlockHeaderVerificationParams(json::Error),
    InvalidRequiredConfs(json::Error),
    InvalidRequiresNota(json::Error),
    InvalidAddressFormat(json::Error),
    InvalidCheckUtxoMaturity(json::Error),
    InvalidScanPolicy(json::Error),
    InvalidMinAddressesNumber(json::Error),
    InvalidPrivKeyPolicy(json::Error),
    InvalidAccount(json::Error),
    InvalidAddressIndex(json::Error),
}

impl UtxoActivationParams {
    pub fn from_legacy_req(req: &Json) -> Result<Self, MmError<UtxoFromLegacyReqErr>> {
        let mode = match req["method"].as_str() {
            Some("enable") => UtxoRpcMode::Native,
            Some("electrum") => {
                let servers =
                    json::from_value(req["servers"].clone()).map_to_mm(UtxoFromLegacyReqErr::InvalidElectrumServers)?;
                UtxoRpcMode::Electrum { servers }
            },
            _ => return MmError::err(UtxoFromLegacyReqErr::UnexpectedMethod),
        };
        let utxo_merge_params =
            json::from_value(req["utxo_merge_params"].clone()).map_to_mm(UtxoFromLegacyReqErr::InvalidMergeParams)?;

        let tx_history = req["tx_history"].as_bool().unwrap_or_default();
        let required_confirmations = json::from_value(req["required_confirmations"].clone())
            .map_to_mm(UtxoFromLegacyReqErr::InvalidRequiredConfs)?;
        let requires_notarization = json::from_value(req["requires_notarization"].clone())
            .map_to_mm(UtxoFromLegacyReqErr::InvalidRequiresNota)?;
        let address_format =
            json::from_value(req["address_format"].clone()).map_to_mm(UtxoFromLegacyReqErr::InvalidAddressFormat)?;
        let check_utxo_maturity = json::from_value(req["check_utxo_maturity"].clone())
            .map_to_mm(UtxoFromLegacyReqErr::InvalidCheckUtxoMaturity)?;
        let scan_policy = json::from_value::<Option<EnableCoinScanPolicy>>(req["scan_policy"].clone())
            .map_to_mm(UtxoFromLegacyReqErr::InvalidScanPolicy)?
            .unwrap_or_default();
        let min_addresses_number = json::from_value(req["min_addresses_number"].clone())
            .map_to_mm(UtxoFromLegacyReqErr::InvalidMinAddressesNumber)?;
        let enable_params = EnabledCoinBalanceParams {
            scan_policy,
            min_addresses_number,
        };
        let priv_key_policy = json::from_value::<Option<PrivKeyActivationPolicy>>(req["priv_key_policy"].clone())
            .map_to_mm(UtxoFromLegacyReqErr::InvalidPrivKeyPolicy)?
            .unwrap_or(PrivKeyActivationPolicy::ContextPrivKey);
        let path_to_address = json::from_value::<Option<HDAccountAddressId>>(req["path_to_address"].clone())
            .map_to_mm(UtxoFromLegacyReqErr::InvalidAddressIndex)?
            .unwrap_or_default();

        Ok(UtxoActivationParams {
            mode,
            utxo_merge_params,
            tx_history,
            required_confirmations,
            requires_notarization,
            address_format,
            gap_limit: None,
            enable_params,
            priv_key_policy,
            check_utxo_maturity,
            path_to_address,
        })
    }
}

#[derive(Clone, Debug, Deserialize, Serialize)]
#[serde(tag = "rpc", content = "rpc_data")]
pub enum UtxoRpcMode {
    Native,
    Electrum { servers: Vec<ElectrumRpcRequest> },
}

impl UtxoRpcMode {
    #[inline]
    pub fn is_native(&self) -> bool { matches!(*self, UtxoRpcMode::Native) }
}

#[derive(Debug)]
pub struct ElectrumBuilderArgs {
    pub spawn_ping: bool,
    pub negotiate_version: bool,
    pub collect_metrics: bool,
}

impl Default for ElectrumBuilderArgs {
    fn default() -> Self {
        ElectrumBuilderArgs {
            spawn_ping: true,
            negotiate_version: true,
            collect_metrics: true,
        }
    }
}

/// Function calculating KMD interest
/// https://github.com/KomodoPlatform/komodo/blob/master/src/komodo_interest.h
fn kmd_interest(
    height: Option<u64>,
    value: u64,
    lock_time: u64,
    current_time: u64,
) -> Result<u64, KmdRewardsNotAccruedReason> {
    const KOMODO_ENDOFERA: u64 = 7_777_777;
    const LOCKTIME_THRESHOLD: u64 = 500_000_000;
    // dPoW Season 7, Fri Jun 30 2023
    const N_S7_HARDFORK_HEIGHT: u64 = 3_484_958;
    // MINUTES_PER_YEAR = 365 * 24 * 60
    const MINUTES_PER_YEAR: u64 = 525_600;
    // Minutes required for 100% active user reward before N_S7_HARDFORK_HEIGHT
    const MINUTES_PER_AUR: u64 = 20 * MINUTES_PER_YEAR;

    // value must be at least 10 KMD
    if value < 1_000_000_000 {
        return Err(KmdRewardsNotAccruedReason::UtxoAmountLessThanTen);
    }
    // locktime must be set
    if lock_time == 0 {
        return Err(KmdRewardsNotAccruedReason::LocktimeNotSet);
    }
    // interest doesn't accrue for lock_time < 500_000_000
    if lock_time < LOCKTIME_THRESHOLD {
        return Err(KmdRewardsNotAccruedReason::LocktimeLessThanThreshold);
    }
    let height = match height {
        Some(h) => h,
        None => return Err(KmdRewardsNotAccruedReason::TransactionInMempool), // consider that the transaction is not mined yet
    };
    // interest will stop accrue after block 7_777_777
    if height >= KOMODO_ENDOFERA {
        return Err(KmdRewardsNotAccruedReason::UtxoHeightGreaterThanEndOfEra);
    };
    // current time must be greater than tx lock_time
    if current_time < lock_time {
        return Err(KmdRewardsNotAccruedReason::OneHourNotPassedYet);
    }

    let mut minutes = (current_time - lock_time) / 60;

    // at least 1 hour should pass
    if minutes < 60 {
        return Err(KmdRewardsNotAccruedReason::OneHourNotPassedYet);
    }

    // interest stop accruing after 1 year before block 1000000
    if minutes > MINUTES_PER_YEAR {
        minutes = MINUTES_PER_YEAR
    };
    // interest stop accruing after 1 month past 1000000 block
    if height >= 1_000_000 && minutes > 31 * 24 * 60 {
        minutes = 31 * 24 * 60;
    }
    minutes -= 59;
    // KIP-0001 proposed a reduction of the AUR from 5% to 0.01%
    // https://github.com/KomodoPlatform/kips/blob/main/kip-0001.mediawiki
    // https://github.com/KomodoPlatform/komodo/pull/584
    let accrued = if height >= N_S7_HARDFORK_HEIGHT {
        (value / MINUTES_PER_AUR) * minutes / 500
    } else {
        (value / MINUTES_PER_AUR) * minutes
    };

    Ok(accrued)
}

fn kmd_interest_accrue_stop_at(height: u64, lock_time: u64) -> u64 {
    let seconds = if height < 1_000_000 {
        // interest stop accruing after 1 year before block 1000000
        365 * 24 * 60 * 60
    } else {
        // interest stop accruing after 1 month past 1000000 block
        31 * 24 * 60 * 60
    };

    lock_time + seconds
}

fn kmd_interest_accrue_start_at(lock_time: u64) -> u64 {
    let one_hour = 60 * 60;
    lock_time + one_hour
}

#[derive(Debug, Serialize, Eq, PartialEq)]
enum KmdRewardsNotAccruedReason {
    LocktimeNotSet,
    LocktimeLessThanThreshold,
    UtxoHeightGreaterThanEndOfEra,
    UtxoAmountLessThanTen,
    OneHourNotPassedYet,
    TransactionInMempool,
}

#[derive(Serialize)]
enum KmdRewardsAccrueInfo {
    Accrued(BigDecimal),
    NotAccruedReason(KmdRewardsNotAccruedReason),
}

#[derive(Serialize)]
pub struct KmdRewardsInfoElement {
    tx_hash: H256Json,
    #[serde(skip_serializing_if = "Option::is_none")]
    height: Option<u64>,
    /// The zero-based index of the output in the transaction’s list of outputs.
    output_index: u32,
    amount: BigDecimal,
    locktime: u64,
    /// Amount of accrued rewards.
    accrued_rewards: KmdRewardsAccrueInfo,
    /// Rewards start to accrue at this time for the given transaction.
    /// None if the rewards will not be accrued.
    #[serde(skip_serializing_if = "Option::is_none")]
    accrue_start_at: Option<u64>,
    /// Rewards stop to accrue at this time for the given transaction.
    /// None if the rewards will not be accrued.
    #[serde(skip_serializing_if = "Option::is_none")]
    accrue_stop_at: Option<u64>,
}

/// Get rewards info of unspent outputs.
/// The list is ordered by the output value.
pub async fn kmd_rewards_info<T: UtxoCommonOps>(coin: &T) -> Result<Vec<KmdRewardsInfoElement>, String> {
    if coin.as_ref().conf.ticker != "KMD" {
        return ERR!("rewards info can be obtained for KMD only");
    }

    let utxo = coin.as_ref();
    let my_address = try_s!(utxo.derivation_method.single_addr_or_err().await);
    let rpc_client = &utxo.rpc_client;
    let mut unspents = try_s!(rpc_client.list_unspent(&my_address, utxo.decimals).compat().await);
    // Reorder from highest to lowest unspent outputs.
    unspents.sort_unstable_by(|x, y| y.value.cmp(&x.value));

    let mut result = Vec::with_capacity(unspents.len());
    for unspent in unspents {
        let tx_hash: H256Json = unspent.outpoint.hash.reversed().into();
        let tx_info = try_s!(rpc_client.get_verbose_transaction(&tx_hash).compat().await);

        let value = unspent.value;
        let locktime = tx_info.locktime as u64;
        let current_time = try_s!(coin.get_current_mtp().await) as u64;
        let accrued_rewards = match kmd_interest(tx_info.height, value, locktime, current_time) {
            Ok(interest) => {
                KmdRewardsAccrueInfo::Accrued(big_decimal_from_sat(interest as i64, coin.as_ref().decimals))
            },
            Err(reason) => KmdRewardsAccrueInfo::NotAccruedReason(reason),
        };

        // `accrue_start_at` and `accrue_stop_at` should be None if the rewards will never be obtained for the given transaction
        let (accrue_start_at, accrue_stop_at) = match &accrued_rewards {
            KmdRewardsAccrueInfo::Accrued(_)
            | KmdRewardsAccrueInfo::NotAccruedReason(KmdRewardsNotAccruedReason::TransactionInMempool)
            | KmdRewardsAccrueInfo::NotAccruedReason(KmdRewardsNotAccruedReason::OneHourNotPassedYet) => {
                let start_at = Some(kmd_interest_accrue_start_at(locktime));
                let stop_at = tx_info
                    .height
                    .map(|height| kmd_interest_accrue_stop_at(height, locktime));
                (start_at, stop_at)
            },
            _ => (None, None),
        };

        result.push(KmdRewardsInfoElement {
            tx_hash,
            height: tx_info.height,
            output_index: unspent.outpoint.index,
            amount: big_decimal_from_sat(value as i64, coin.as_ref().decimals),
            locktime,
            accrued_rewards,
            accrue_start_at,
            accrue_stop_at,
        });
    }

    Ok(result)
}

/// Denominate BigDecimal amount of coin units to satoshis
pub fn sat_from_big_decimal(amount: &BigDecimal, decimals: u8) -> NumConversResult<u64> {
    (amount * BigDecimal::from(10u64.pow(decimals as u32)))
        .to_u64()
        .or_mm_err(|| {
            let err = format!("Could not get sat from amount {} with decimals {}", amount, decimals);
            NumConversError::new(err)
        })
}

async fn send_outputs_from_my_address_impl<T>(
    coin: T,
    outputs: Vec<TransactionOutput>,
) -> Result<UtxoTx, TransactionErr>
where
    T: UtxoCommonOps + GetUtxoListOps,
{
    let my_address = try_tx_s!(coin.as_ref().derivation_method.single_addr_or_err().await);
    let (unspents, recently_sent_txs) = try_tx_s!(coin.get_unspent_ordered_list(&my_address).await);
    generate_and_send_tx(&coin, unspents, None, FeePolicy::SendExact, recently_sent_txs, outputs).await
}

/// Generates and sends tx using unspents and outputs adding new record to the recently_spent in case of success
async fn generate_and_send_tx<T>(
    coin: &T,
    unspents: Vec<UnspentInfo>,
    required_inputs: Option<Vec<UnspentInfo>>,
    fee_policy: FeePolicy,
    mut recently_spent: RecentlySpentOutPointsGuard<'_>,
    outputs: Vec<TransactionOutput>,
) -> Result<UtxoTx, TransactionErr>
where
    T: AsRef<UtxoCoinFields> + UtxoTxGenerationOps + UtxoTxBroadcastOps,
{
    let my_address = try_tx_s!(coin.as_ref().derivation_method.single_addr_or_err().await);
    let key_pair = try_tx_s!(coin.as_ref().priv_key_policy.activated_key_or_err());

    let mut builder = UtxoTxBuilder::new(coin)
        .await
        .add_available_inputs(unspents)
        .add_outputs(outputs)
        .with_fee_policy(fee_policy);
    if let Some(required) = required_inputs {
        builder = builder.add_required_inputs(required);
    }
    let (unsigned, _) = try_tx_s!(builder.build().await);

    let spent_unspents = unsigned
        .inputs
        .iter()
        .map(|input| UnspentInfo {
            outpoint: input.previous_output,
            value: input.amount,
            height: None,
        })
        .collect();

    let signature_version = match my_address.addr_format() {
        UtxoAddressFormat::Segwit => SignatureVersion::WitnessV0,
        _ => coin.as_ref().conf.signature_version,
    };

    let prev_script = utxo_common::output_script_checked(coin.as_ref(), &my_address)
        .map_err(|e| TransactionErr::Plain(ERRL!("{}", e)))?;
    let signed = try_tx_s!(sign_tx(
        unsigned,
        key_pair,
        prev_script,
        signature_version,
        coin.as_ref().conf.fork_id
    ));

    try_tx_s!(coin.broadcast_tx(&signed).await, signed);

    recently_spent.add_spent(spent_unspents, signed.hash(), signed.outputs.clone());

    Ok(signed)
}

/// Builds transaction output script for an Address struct
pub fn output_script(address: &Address) -> Result<Script, keys::Error> {
    match address.script_type() {
        AddressScriptType::P2PKH => Ok(Builder::build_p2pkh(address.hash())),
        AddressScriptType::P2SH => Ok(Builder::build_p2sh(address.hash())),
        AddressScriptType::P2WPKH => Builder::build_p2wpkh(address.hash()),
        AddressScriptType::P2WSH => Builder::build_p2wsh(address.hash()),
    }
}

pub fn address_by_conf_and_pubkey_str(
    coin: &str,
    conf: &Json,
    pubkey: &str,
    addr_format: UtxoAddressFormat,
) -> Result<String, String> {
    // using a reasonable default here
    let params = UtxoActivationParams {
        mode: UtxoRpcMode::Native,
        utxo_merge_params: None,
        tx_history: false,
        required_confirmations: None,
        requires_notarization: None,
        address_format: None,
        gap_limit: None,
        enable_params: EnabledCoinBalanceParams::default(),
        priv_key_policy: PrivKeyActivationPolicy::ContextPrivKey,
        check_utxo_maturity: None,
        // This will not be used since the pubkey from orderbook/etc.. will be used to generate the address
        path_to_address: HDAccountAddressId::default(),
    };
    let conf_builder = UtxoConfBuilder::new(conf, &params, coin);
    let utxo_conf = try_s!(conf_builder.build());
    let pubkey_bytes = try_s!(hex::decode(pubkey));
    let hash = dhash160(&pubkey_bytes);

    let address = AddressBuilder::new(
        addr_format,
        hash.into(),
        utxo_conf.checksum_type,
        utxo_conf.address_prefixes,
        utxo_conf.bech32_hrp,
    )
    .as_pkh()
    .build()?;
    address.display_address()
}

fn parse_hex_encoded_u32(hex_encoded: &str) -> Result<u32, MmError<String>> {
    let hex_encoded = hex_encoded.strip_prefix("0x").unwrap_or(hex_encoded);
    let bytes = hex::decode(hex_encoded).map_to_mm(|e| e.to_string())?;
    let be_bytes: [u8; 4] = bytes
        .as_slice()
        .try_into()
        .map_to_mm(|e: TryFromSliceError| e.to_string())?;
    Ok(u32::from_be_bytes(be_bytes))
}

#[test]
fn test_parse_hex_encoded_u32() {
    assert_eq!(parse_hex_encoded_u32("0x892f2085"), Ok(2301567109));
    assert_eq!(parse_hex_encoded_u32("892f2085"), Ok(2301567109));
    assert_eq!(parse_hex_encoded_u32("0x7361707a"), Ok(1935765626));
}