/*
 * This file is part of the Flowee project
 * Copyright (C) 2009-2010 Satoshi Nakamoto
 * Copyright (C) 2009-2015 The Bitcoin Core developers
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef FLOWEE_KEYSTORE_H
#define FLOWEE_KEYSTORE_H

#include <primitives/PrivateKey.h>
#include <primitives/PublicKey.h>
#include <primitives/script.h>
#include "sync.h"

#include <utils/support/allocators/secure.h>

#include <boost/signals2/signal.hpp>
#include <boost/variant.hpp>

/** A virtual base class for key stores */
class CKeyStore
{
protected:
    mutable CCriticalSection cs_KeyStore;

public:
    virtual ~CKeyStore() {}

    //! Add a key to the store.
    virtual bool AddKeyPubKey(const PrivateKey &key, const PublicKey &pubkey) =0;
    virtual bool AddKey(const PrivateKey &key);

    //! Check whether a key corresponding to a given address is present in the store.
    virtual bool HaveKey(const KeyId &address) const =0;
    virtual bool GetKey(const KeyId &address, PrivateKey& keyOut) const =0;
    virtual void GetKeys(std::set<KeyId> &setAddress) const =0;
    virtual bool GetPubKey(const KeyId &address, PublicKey& vchPubKeyOut) const =0;

    //! Support for BIP 0013 : see https://github.com/bitcoin/bips/blob/master/bip-0013.mediawiki
    virtual bool AddCScript(const CScript& redeemScript) =0;
    virtual bool HaveCScript(const CScriptID &hash) const =0;
    virtual bool GetCScript(const CScriptID &hash, CScript& redeemScriptOut) const =0;

    //! Support for Watch-only addresses
    virtual bool AddWatchOnly(const CScript &dest) =0;
    virtual bool RemoveWatchOnly(const CScript &dest) =0;
    virtual bool HaveWatchOnly(const CScript &dest) const =0;
    virtual bool HaveWatchOnly() const =0;
};

typedef std::map<KeyId, PrivateKey> KeyMap;
typedef std::map<KeyId, PublicKey> WatchKeyMap;
typedef std::map<CScriptID, CScript > ScriptMap;
typedef std::set<CScript> WatchOnlySet;

/** Basic key store, that keeps keys in an address->secret map */
class CBasicKeyStore : public CKeyStore
{
protected:
    KeyMap mapKeys;
    WatchKeyMap mapWatchKeys;
    ScriptMap mapScripts;
    WatchOnlySet setWatchOnly;

public:
    bool AddKeyPubKey(const PrivateKey& key, const PublicKey &pubkey);
    bool GetPubKey(const KeyId &address, PublicKey& vchPubKeyOut) const;
    bool HaveKey(const KeyId &address) const
    {
        bool result;
        {
            LOCK(cs_KeyStore);
            result = (mapKeys.count(address) > 0);
        }
        return result;
    }
    void GetKeys(std::set<KeyId> &setAddress) const
    {
        setAddress.clear();
        {
            LOCK(cs_KeyStore);
            KeyMap::const_iterator mi = mapKeys.begin();
            while (mi != mapKeys.end())
            {
                setAddress.insert((*mi).first);
                mi++;
            }
        }
    }
    bool GetKey(const KeyId &address, PrivateKey &keyOut) const
    {
        {
            LOCK(cs_KeyStore);
            KeyMap::const_iterator mi = mapKeys.find(address);
            if (mi != mapKeys.end())
            {
                keyOut = mi->second;
                return true;
            }
        }
        return false;
    }
    virtual bool AddCScript(const CScript& redeemScript);
    virtual bool HaveCScript(const CScriptID &hash) const;
    virtual bool GetCScript(const CScriptID &hash, CScript& redeemScriptOut) const;

    virtual bool AddWatchOnly(const CScript &dest);
    virtual bool RemoveWatchOnly(const CScript &dest);
    virtual bool HaveWatchOnly(const CScript &dest) const;
    virtual bool HaveWatchOnly() const;
};

typedef std::vector<unsigned char, secure_allocator<unsigned char> > CKeyingMaterial;
typedef std::map<KeyId, std::pair<PublicKey, std::vector<unsigned char> > > CryptedKeyMap;

#endif