// Copyright (c) 2018-present The Bitcoin Core developers

// Distributed under the MIT software license, see the accompanying

// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#ifndef BITCOIN_INTERFACES_WALLET_H

#define BITCOIN_INTERFACES_WALLET_H

#include <addresstype.h>

#include <common/signmessage.h>

#include <common/types.h>

#include <consensus/amount.h>

#include <interfaces/chain.h>

#include <primitives/transaction.h>

#include <pubkey.h>

#include <support/allocators/secure.h>

#include <util/expected.h>

#include <util/fs.h>

#include <util/result.h>

#include <util/ui_change_type.h>

#include <wallet/types.h>

#include <compare>

#include <cstddef>

#include <cstdint>

#include <functional>

#include <map>

#include <memory>

#include <optional>

#include <set>

#include <string>

#include <tuple>

#include <utility>

#include <vector>

class ArgsManager;

class CScript;

class PartiallySignedTransaction;

class uint256;

enum class FeeReason;

enum class OutputType;

struct bilingual_str;

struct CExtKey;

namespace wallet {

class CCoinControl;

class CWallet;

struct CRecipient;

struct WalletContext;

} // namespace wallet

namespace interfaces {

class Handler;

struct WalletAddress;

struct WalletBalances;

struct WalletTx;

struct WalletTxOut;

struct WalletTxStatus;

struct WalletMigrationResult;

//! Interface for accessing a wallet.

class Wallet

{

public:

    virtual ~Wallet() = default;

    //! Encrypt wallet.

    virtual bool encryptWallet(const SecureString& wallet_passphrase) = 0;

    //! Return whether wallet is encrypted.

    virtual bool isCrypted() = 0;

    //! Lock wallet.

    virtual bool lock() = 0;

    //! Unlock wallet.

    virtual bool unlock(const SecureString& wallet_passphrase) = 0;

    //! Return whether wallet is locked.

    virtual bool isLocked() = 0;

    //! Change wallet passphrase.

    virtual bool changeWalletPassphrase(const SecureString& old_wallet_passphrase,

        const SecureString& new_wallet_passphrase) = 0;

    //! Abort a rescan.

    virtual void abortRescan() = 0;

    //! Back up wallet.

    virtual bool backupWallet(const std::string& filename) = 0;

    //! Get wallet name.

    virtual std::string getWalletName() = 0;

    // Get a new address.

    virtual util::Result<CTxDestination> getNewDestination(OutputType type, const std::string& label) = 0;

    //! Get public key.

    virtual bool getPubKey(const CScript& script, const CKeyID& address, CPubKey& pub_key) = 0;

    //! Generate and add a new HD key to the wallet.

    //! Requires the wallet to be unlocked. Returns a `WalletError` with code

    //! `WalletErrorCode::UnlockNeeded` if the wallet is locked.

    //!

    //! Return the master xpub for the added HD key, or a `WalletError` on failure.

    virtual util::Expected<CExtPubKey, wallet::WalletError> addHDKey(const std::optional<CExtKey>& key) = 0;

    //! Sign message

    virtual SigningResult signMessage(const std::string& message, const PKHash& pkhash, std::string& str_sig) = 0;

    //! Return whether wallet has private key.

    virtual bool isSpendable(const CTxDestination& dest) = 0;

    //! Add or update address.

    virtual bool setAddressBook(const CTxDestination& dest, const std::string& name, const std::optional<wallet::AddressPurpose>& purpose) = 0;

    // Remove address.

    virtual bool delAddressBook(const CTxDestination& dest) = 0;

    //! Look up address in wallet, return whether exists.

    virtual bool getAddress(const CTxDestination& dest,

        std::string* name,

        wallet::AddressPurpose* purpose) = 0;

    //! Get wallet address list.

    virtual std::vector<WalletAddress> getAddresses() = 0;

    //! Get receive requests.

    virtual std::vector<std::string> getAddressReceiveRequests() = 0;

    //! Save or remove receive request.

    virtual bool setAddressReceiveRequest(const CTxDestination& dest, const std::string& id, const std::string& value) = 0;

    //! Display address on external signer

    virtual util::Result<void> displayAddress(const CTxDestination& dest) = 0;

    //! Lock coin.

    virtual bool lockCoin(const COutPoint& output, bool write_to_db) = 0;

    //! Unlock coin.

    virtual bool unlockCoin(const COutPoint& output) = 0;

    //! Return whether coin is locked.

    virtual bool isLockedCoin(const COutPoint& output) = 0;

    //! List locked coins.

    virtual void listLockedCoins(std::vector<COutPoint>& outputs) = 0;

    //! Create transaction.

    virtual util::Result<wallet::CreatedTransactionResult> createTransaction(const std::vector<wallet::CRecipient>& recipients,

        const wallet::CCoinControl& coin_control,

        bool sign,

        std::optional<unsigned int> change_pos) = 0;

    //! Commit transaction.

    virtual void commitTransaction(CTransactionRef tx, const std::vector<std::string>& messages) = 0;

    //! Return whether transaction can be abandoned.

    virtual bool transactionCanBeAbandoned(const Txid& txid) = 0;

    //! Abandon transaction.

    virtual bool abandonTransaction(const Txid& txid) = 0;

    //! Return whether transaction can be bumped.

    virtual bool transactionCanBeBumped(const Txid& txid) = 0;

    //! Create bump transaction.

    virtual bool createBumpTransaction(const Txid& txid,

        const wallet::CCoinControl& coin_control,

        std::vector<bilingual_str>& errors,

        CAmount& old_fee,

        CAmount& new_fee,

        CMutableTransaction& mtx) = 0;

    //! Sign bump transaction.

    virtual bool signBumpTransaction(CMutableTransaction& mtx) = 0;

    //! Commit bump transaction.

    virtual bool commitBumpTransaction(const Txid& txid,

        CMutableTransaction&& mtx,

        std::vector<bilingual_str>& errors,

        Txid& bumped_txid) = 0;

    //! Get a transaction.

    virtual CTransactionRef getTx(const Txid& txid) = 0;

    //! Get transaction information.

    virtual WalletTx getWalletTx(const Txid& txid) = 0;

    //! Get list of all wallet transactions.

    virtual std::set<WalletTx> getWalletTxs() = 0;

    //! Try to get updated status for a particular transaction, if possible without blocking.

    virtual bool tryGetTxStatus(const Txid& txid,

        WalletTxStatus& tx_status,

        int& num_blocks,

        int64_t& block_time) = 0;

    //! Get transaction details.

    virtual WalletTx getWalletTxDetails(const Txid& txid,

        WalletTxStatus& tx_status,

        std::vector<std::string>& messages,

        std::vector<std::string>& payment_requests,

        bool& in_mempool,

        int& num_blocks) = 0;

    //! Fill PSBT.

    virtual std::optional<common::PSBTError> fillPSBT(const common::PSBTFillOptions& options,

        size_t* n_signed,

        PartiallySignedTransaction& psbtx,

        bool& complete) = 0;

    //! Get balances.

    virtual WalletBalances getBalances() = 0;

    //! Get balances if possible without blocking.

    virtual bool tryGetBalances(WalletBalances& balances, uint256& block_hash) = 0;

    //! Get balance.

    virtual CAmount getBalance() = 0;

    //! Get available balance.

    virtual CAmount getAvailableBalance(const wallet::CCoinControl& coin_control) = 0;

    //! Return whether transaction input belongs to wallet.

    virtual bool txinIsMine(const CTxIn& txin) = 0;

    //! Return whether transaction output belongs to wallet.

    virtual bool txoutIsMine(const CTxOut& txout) = 0;

    //! Return debit amount if transaction input belongs to wallet.

    virtual CAmount getDebit(const CTxIn& txin) = 0;

    //! Return credit amount if transaction input belongs to wallet.

    virtual CAmount getCredit(const CTxOut& txout) = 0;

    //! Return AvailableCoins + LockedCoins grouped by wallet address.

    //! (put change in one group with wallet address)

    using CoinsList = std::map<CTxDestination, std::vector<std::tuple<COutPoint, WalletTxOut>>>;

    virtual CoinsList listCoins() = 0;

    //! Return wallet transaction output information.

    virtual std::vector<WalletTxOut> getCoins(const std::vector<COutPoint>& outputs) = 0;

    //! Get required fee.

    virtual CAmount getRequiredFee(unsigned int tx_bytes) = 0;

    //! Get minimum fee.

    virtual CAmount getMinimumFee(unsigned int tx_bytes,

        const wallet::CCoinControl& coin_control,

        std::optional<int>* returned_target,

        FeeReason* reason) = 0;

    //! Get tx confirm target.

    virtual unsigned int getConfirmTarget() = 0;

    // Return whether HD enabled.

    virtual bool hdEnabled() = 0;

    // Return whether the wallet is blank.

    virtual bool canGetAddresses() = 0;

    // Return whether private keys enabled.

    virtual bool privateKeysDisabled() = 0;

    // Return whether the wallet contains a Taproot scriptPubKeyMan

    virtual bool taprootEnabled() = 0;

    // Return whether wallet uses an external signer.

    virtual bool hasExternalSigner() = 0;

    // Get default address type.

    virtual OutputType getDefaultAddressType() = 0;

    //! Get max tx fee.

    virtual CAmount getDefaultMaxTxFee() = 0;

    // Remove wallet.

    virtual void remove() = 0;

    //! Register handler for unload message.

    using UnloadFn = std::function<void()>;

    virtual std::unique_ptr<Handler> handleUnload(UnloadFn fn) = 0;

    //! Register handler for show progress messages.

    using ShowProgressFn = std::function<void(const std::string& title, int progress)>;

    virtual std::unique_ptr<Handler> handleShowProgress(ShowProgressFn fn) = 0;

    //! Register handler for status changed messages.

    using StatusChangedFn = std::function<void()>;

    virtual std::unique_ptr<Handler> handleStatusChanged(StatusChangedFn fn) = 0;

    //! Register handler for address book changed messages.

    using AddressBookChangedFn = std::function<void(const CTxDestination& address,

        const std::string& label,

        bool is_mine,

        wallet::AddressPurpose purpose,

        ChangeType status)>;

    virtual std::unique_ptr<Handler> handleAddressBookChanged(AddressBookChangedFn fn) = 0;

    //! Register handler for transaction changed messages.

    using TransactionChangedFn = std::function<void(const Txid& txid, ChangeType status)>;

    virtual std::unique_ptr<Handler> handleTransactionChanged(TransactionChangedFn fn) = 0;

    //! Register handler for keypool changed messages.

    using CanGetAddressesChangedFn = std::function<void()>;

    virtual std::unique_ptr<Handler> handleCanGetAddressesChanged(CanGetAddressesChangedFn fn) = 0;

    //! Return pointer to internal wallet class, useful for testing.

    virtual wallet::CWallet* wallet() { return nullptr; }

    //! Export a watchonly wallet file. See CWallet::ExportWatchOnlyWallet

    virtual util::Result<std::string> exportWatchOnlyWallet(const fs::path& destination) = 0;

};

//! Wallet chain client that in addition to having chain client methods for

//! starting up, shutting down, and registering RPCs, also has additional

//! methods (called by the GUI) to load and create wallets.

class WalletLoader : public ChainClient

{

public:

    //! Create new wallet.

    virtual util::Result<std::unique_ptr<Wallet>> createWallet(const std::string& name, const SecureString& passphrase, uint64_t wallet_creation_flags, std::vector<bilingual_str>& warnings) = 0;

    //! Load existing wallet.

    virtual util::Result<std::unique_ptr<Wallet>> loadWallet(const std::string& name, std::vector<bilingual_str>& warnings) = 0;

    //! Return default wallet directory.

    virtual std::string getWalletDir() = 0;

    //! Restore backup wallet

    virtual util::Result<std::unique_ptr<Wallet>> restoreWallet(const fs::path& backup_file, const std::string& wallet_name, std::vector<bilingual_str>& warnings, bool load_after_restore) = 0;

    //! Migrate a wallet

    virtual util::Result<WalletMigrationResult> migrateWallet(const std::string& name, const SecureString& passphrase, bool load_wallet) = 0;

    //! Returns true if wallet stores encryption keys

    virtual bool isEncrypted(const std::string& wallet_name) = 0;

    //! Return available wallets in wallet directory.

    virtual std::vector<std::pair<std::string, std::string>> listWalletDir() = 0;

    //! Return interfaces for accessing wallets (if any).

    virtual std::vector<std::unique_ptr<Wallet>> getWallets() = 0;

    //! Register handler for load wallet messages. This callback is triggered by

    //! createWallet and loadWallet above, and also triggered when wallets are

    //! loaded at startup or by RPC.

    using LoadWalletFn = std::function<void(std::unique_ptr<Wallet> wallet)>;

    virtual std::unique_ptr<Handler> handleLoadWallet(LoadWalletFn fn) = 0;

    //! Return pointer to internal context, useful for testing.

    virtual wallet::WalletContext* context() { return nullptr; }

};

//! Information about one wallet address.

struct WalletAddress

{

    CTxDestination dest;

    bool is_mine;

    wallet::AddressPurpose purpose;

    std::string name;

    WalletAddress(CTxDestination dest, bool is_mine, wallet::AddressPurpose purpose, std::string name)

        : dest(std::move(dest)), is_mine(is_mine), purpose(std::move(purpose)), name(std::move(name))

    {

    }

};

//! Collection of wallet balances.

struct WalletBalances

{

    CAmount balance = 0;

    CAmount unconfirmed_balance = 0;

    CAmount immature_balance = 0;

    CAmount used_balance = 0;

    CAmount nonmempool_balance = 0;

    bool balanceChanged(const WalletBalances& prev) const

    {

        return balance != prev.balance || unconfirmed_balance != prev.unconfirmed_balance ||

               immature_balance != prev.immature_balance ||

               used_balance != prev.used_balance || nonmempool_balance != prev.nonmempool_balance;

    }

};

// Wallet transaction information.

struct WalletTx

{

    CTransactionRef tx;

    std::vector<bool> txin_is_mine;

    std::vector<bool> txout_is_mine;

    std::vector<bool> txout_is_change;

    std::vector<CTxDestination> txout_address;

    std::vector<bool> txout_address_is_mine;

    CAmount credit;

    CAmount debit;

    CAmount change;

    int64_t time;

    std::optional<std::string> from; // Deprecated

    std::optional<std::string> message; // Deprecated

    std::optional<std::string> comment;

    std::optional<std::string> comment_to;

    bool is_coinbase;

    bool operator<(const WalletTx& a) const { return tx->GetHash() < a.tx->GetHash(); }

};

//! Updated transaction status.

struct WalletTxStatus

{

    int block_height;

    int blocks_to_maturity;

    int depth_in_main_chain;

    unsigned int time_received;

    uint32_t lock_time;

    bool is_trusted;

    bool is_abandoned;

    bool is_coinbase;

    bool is_in_main_chain;

};

//! Wallet transaction output.

struct WalletTxOut

{

    CTxOut txout;

    int64_t time;

    int depth_in_main_chain = -1;

    bool is_spent = false;

};

//! Migrated wallet info

struct WalletMigrationResult

{

    std::unique_ptr<Wallet> wallet;

    std::optional<std::string> watchonly_wallet_name;

    std::optional<std::string> solvables_wallet_name;

    fs::path backup_path;

};

//! Return implementation of Wallet interface. This function is defined in

//! dummywallet.cpp and throws if the wallet component is not compiled.

std::unique_ptr<Wallet> MakeWallet(wallet::WalletContext& context, const std::shared_ptr<wallet::CWallet>& wallet);

//! Return implementation of ChainClient interface for a wallet loader. This

//! function will be undefined in builds where ENABLE_WALLET is false.

std::unique_ptr<WalletLoader> MakeWalletLoader(Chain& chain, ArgsManager& args);

} // namespace interfaces

#endif // BITCOIN_INTERFACES_WALLET_H