// Copyright (c) 2014-2025 The Dash Core developers
// Distributed under the MIT software license, see the accompanying
#ifndef BITCOIN_WALLET_HDCHAIN_H
#define BITCOIN_WALLET_HDCHAIN_H

#include <key.h>
#include <script/keyorigin.h>
#include <sync.h>

namespace wallet {
/* hd account data model */
struct CHDAccount {
    uint32_t nExternalChainCounter{0};
    uint32_t nInternalChainCounter{0};

    SERIALIZE_METHODS(CHDAccount, obj)
    {
        READWRITE(obj.nExternalChainCounter, obj.nInternalChainCounter);
    }
};

/* simple HD chain data model */
class CHDChain
{
private:
    mutable RecursiveMutex cs;

    static const int CURRENT_VERSION = 1;
    int nVersion GUARDED_BY(cs) {CURRENT_VERSION};

    uint256 id GUARDED_BY(cs);

    bool fCrypted GUARDED_BY(cs) {false};

    SecureVector vchSeed GUARDED_BY(cs);
    SecureVector vchMnemonic GUARDED_BY(cs);
    SecureVector vchMnemonicPassphrase GUARDED_BY(cs);

    std::map<uint32_t, CHDAccount> GUARDED_BY(cs) mapAccounts;

public:
    /** Default for -mnemonicbits */
    static constexpr int DEFAULT_MNEMONIC_BITS = 128; // 128 bits == 12 words

    CHDChain() = default;
    CHDChain(const CHDChain& other) :
        nVersion(other.nVersion),
        id(other.id),
        fCrypted(other.fCrypted),
        vchSeed(other.vchSeed),
        vchMnemonic(other.vchMnemonic),
        vchMnemonicPassphrase(other.vchMnemonicPassphrase),
        mapAccounts(other.mapAccounts)
        {}

    SERIALIZE_METHODS(CHDChain, obj)
    {
        LOCK(obj.cs);
        READWRITE(
                obj.nVersion,
                obj.id,
                obj.fCrypted,
                obj.vchSeed,
                obj.vchMnemonic,
                obj.vchMnemonicPassphrase,
                obj.mapAccounts
                );
    }

    void swap(CHDChain& first, CHDChain& second) noexcept
    {
        // enable ADL (not necessary in our case, but good practice)
        using std::swap;

        // by swapping the members of two classes,
        // the two classes are effectively swapped
        LOCK2(first.cs, second.cs);
        swap(first.nVersion, second.nVersion);
        swap(first.id, second.id);
        swap(first.fCrypted, second.fCrypted);
        swap(first.vchSeed, second.vchSeed);
        swap(first.vchMnemonic, second.vchMnemonic);
        swap(first.vchMnemonicPassphrase, second.vchMnemonicPassphrase);
        swap(first.mapAccounts, second.mapAccounts);
    }
    CHDChain& operator=(CHDChain from)
    {
        swap(*this, from);
        return *this;
    }

    bool SetNull();
    bool IsNull() const;

    void SetCrypted(bool fCryptedIn);
    bool IsCrypted() const;

    bool SetMnemonic(const SecureVector& vchMnemonic, const SecureVector& vchMnemonicPassphrase, bool fUpdateID);
    bool SetMnemonic(const SecureString& ssMnemonic, const SecureString& ssMnemonicPassphrase, bool fUpdateID);
    bool GetMnemonic(SecureVector& vchMnemonicRet, SecureVector& vchMnemonicPassphraseRet) const;
    bool GetMnemonic(SecureString& ssMnemonicRet, SecureString& ssMnemonicPassphraseRet) const;

    bool SetSeed(const SecureVector& vchSeedIn, bool fUpdateID);
    SecureVector GetSeed() const;

    uint256 GetID() const { LOCK(cs); return id; }

    uint256 GetSeedHash();
    void DeriveChildExtKey(uint32_t nAccountIndex, bool fInternal, uint32_t nChildIndex, CExtKey& extKeyRet, KeyOriginInfo& key_origin);

    void AddAccount();
    bool GetAccount(uint32_t nAccountIndex, CHDAccount& hdAccountRet);
    bool SetAccount(uint32_t nAccountIndex, const CHDAccount& hdAccount);
    size_t CountAccounts();
};

/* hd pubkey data model */
class CHDPubKey
{
private:
    static const int CURRENT_VERSION = 1;
    [[maybe_unused]] int nVersion{CHDPubKey::CURRENT_VERSION};

public:
    CExtPubKey extPubKey{};
    uint256 hdchainID;
    uint32_t nAccountIndex{0};
    uint32_t nChangeIndex{0};

    CHDPubKey() = default;

    SERIALIZE_METHODS(CHDPubKey, obj)
    {
        READWRITE(obj.nVersion, obj.extPubKey, obj.hdchainID, obj.nAccountIndex, obj.nChangeIndex);
    }

    std::string GetKeyPath() const;
};

/** Purpose code used for DIP9 (feature derivation paths) */
constexpr uint8_t BIP32_PURPOSE_FEATURE{9};
/** Purpose code allotted to BIP 44 (standard derivation paths) */
constexpr uint8_t BIP32_PURPOSE_STANDARD{44};

} // namespace wallet

#endif // BITCOIN_WALLET_HDCHAIN_H
