// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2012 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_WALLETDB_H
#define BITCOIN_WALLETDB_H

#include "db.h"
#include "base58.h"

class CKeyPool;
class CAccount;
class CWallet;
class CWalletTx;

/** Error statuses for the wallet database */
enum DBErrors
{
    DB_LOAD_OK,
    DB_CORRUPT,
    DB_NONCRITICAL_ERROR,
    DB_TOO_NEW,
    DB_LOAD_FAIL,
    DB_NEED_REWRITE
};

class CKeyMetadata
{
public:
    static const int CURRENT_VERSION=1;
    int nVersion;
    int64 nCreateTime; // 0 means unknown
    std::string username;

    CKeyMetadata()
    {
        SetNull();
    }
    CKeyMetadata(int64 nCreateTime_, std::string username_)
    {
        nVersion = CKeyMetadata::CURRENT_VERSION;
        nCreateTime = nCreateTime_;
        username = username_;
    }

    IMPLEMENT_SERIALIZE
    (
        READWRITE(this->nVersion);
        nVersion = this->nVersion;
        READWRITE(nCreateTime);
        READWRITE(username);
    )

    void SetNull()
    {
        nVersion = CKeyMetadata::CURRENT_VERSION;
        nCreateTime = 0;
        username.clear();
    }
};

/** Access to the wallet database (twisterwallet.dat) */
class CWalletDB : public CDB
{
public:
    CWalletDB(std::string strFilename, const char* pszMode="r+") : CDB(strFilename.c_str(), pszMode)
    {
    }
private:
    CWalletDB(const CWalletDB&);
    void operator=(const CWalletDB&);
public:
    bool WriteName(const std::string& strAddress, const std::string& strName);

    bool EraseName(const std::string& strAddress);

    bool WriteTx(uint256 hash, const CWalletTx& wtx)
    {
        nWalletDBUpdated++;
        return Write(std::make_pair(std::string("tx"), hash), wtx);
    }

    bool EraseTx(uint256 hash)
    {
        nWalletDBUpdated++;
        return Erase(std::make_pair(std::string("tx"), hash));
    }

    bool WriteKey(const CPubKey& vchPubKey, const CPrivKey& vchPrivKey,
                  const CKeyMetadata &keyMeta)
    {
        nWalletDBUpdated++;

        if (!Write(std::make_pair(std::string("keymeta"), vchPubKey),
                   keyMeta))
            return false;

        return Write(std::make_pair(std::string("key"), vchPubKey), vchPrivKey, false);
    }

    bool WriteCryptedKey(const CPubKey& vchPubKey,
                         const std::vector<unsigned char>& vchCryptedSecret,
                         const CKeyMetadata &keyMeta)
    {
        const bool fEraseUnencryptedKey = true;
        nWalletDBUpdated++;

        if (!Write(std::make_pair(std::string("keymeta"), vchPubKey),
                   keyMeta))
            return false;

        if (!Write(std::make_pair(std::string("ckey"), vchPubKey), vchCryptedSecret, false))
            return false;
        if (fEraseUnencryptedKey)
        {
            Erase(std::make_pair(std::string("key"), vchPubKey));
            Erase(std::make_pair(std::string("wkey"), vchPubKey));
        }
        return true;
    }

    bool WriteMasterKey(unsigned int nID, const CMasterKey& kMasterKey)
    {
        nWalletDBUpdated++;
        return Write(std::make_pair(std::string("mkey"), nID), kMasterKey, true);
    }

    bool WriteCScript(const uint160& hash, const CScript& redeemScript)
    {
        nWalletDBUpdated++;
        return Write(std::make_pair(std::string("cscript"), hash), redeemScript, false);
    }

    bool WriteBestBlock(const CBlockLocator& locator)
    {
        nWalletDBUpdated++;
        return Write(std::string("bestblock"), locator);
    }

    bool ReadBestBlock(CBlockLocator& locator)
    {
        return Read(std::string("bestblock"), locator);
    }

    bool WriteOrderPosNext(int64 nOrderPosNext)
    {
        nWalletDBUpdated++;
        return Write(std::string("orderposnext"), nOrderPosNext);
    }

    bool WriteDefaultKey(const CPubKey& vchPubKey)
    {
        nWalletDBUpdated++;
        return Write(std::string("defaultkey"), vchPubKey);
    }

    bool ReadPool(int64 nPool, CKeyPool& keypool)
    {
        return Read(std::make_pair(std::string("pool"), nPool), keypool);
    }

    bool WritePool(int64 nPool, const CKeyPool& keypool)
    {
        nWalletDBUpdated++;
        return Write(std::make_pair(std::string("pool"), nPool), keypool);
    }

    bool ErasePool(int64 nPool)
    {
        nWalletDBUpdated++;
        return Erase(std::make_pair(std::string("pool"), nPool));
    }

    // Settings are no longer stored in twisterwallet.dat; these are
    // used only for backwards compatibility:
    template<typename T>
    bool ReadSetting(const std::string& strKey, T& value)
    {
        return Read(std::make_pair(std::string("setting"), strKey), value);
    }
    template<typename T>
    bool WriteSetting(const std::string& strKey, const T& value)
    {
        nWalletDBUpdated++;
        return Write(std::make_pair(std::string("setting"), strKey), value);
    }
    bool EraseSetting(const std::string& strKey)
    {
        nWalletDBUpdated++;
        return Erase(std::make_pair(std::string("setting"), strKey));
    }

    bool WriteMinVersion(int nVersion)
    {
        return Write(std::string("minversion"), nVersion);
    }

    bool ReadAccount(const std::string& strAccount, CAccount& account);
    bool WriteAccount(const std::string& strAccount, const CAccount& account);
private:
public:
    DBErrors LoadWallet(CWallet* pwallet);
    static bool Recover(CDBEnv& dbenv, std::string filename, bool fOnlyKeys);
    static bool Recover(CDBEnv& dbenv, std::string filename);
};

bool BackupWallet(const CWallet& wallet, const std::string& strDest);

#endif // BITCOIN_WALLETDB_H