/*
 * 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/>.
 */

#include "keystore.h"
#include <primitives/ScriptDefines.h> // for MAX_SCRIPT_ELEMENT_SIZE

bool CKeyStore::AddKey(const PrivateKey &key) {
    return AddKeyPubKey(key, key.getPubKey());
}

bool CBasicKeyStore::GetPubKey(const KeyId &address, PublicKey &vchPubKeyOut) const
{
    PrivateKey key;
    if (!GetKey(address, key)) {
        WatchKeyMap::const_iterator it = mapWatchKeys.find(address);
        if (it != mapWatchKeys.end()) {
            vchPubKeyOut = it->second;
            return true;
        }
        return false;
    }
    vchPubKeyOut = key.getPubKey();
    return true;
}

bool CBasicKeyStore::AddKeyPubKey(const PrivateKey& key, const PublicKey &pubkey)
{
    LOCK(cs_KeyStore);
    mapKeys[pubkey.getKeyId()] = key;
    return true;
}

bool CBasicKeyStore::AddCScript(const CScript& redeemScript)
{
    if (redeemScript.size() > MAX_SCRIPT_ELEMENT_SIZE) {
        logCritical(Log::Internals) << "CBasicKeyStore::AddCScript(): redeemScripts >" << MAX_SCRIPT_ELEMENT_SIZE << "bytes are invalid";
        return false;
    }

    LOCK(cs_KeyStore);
    mapScripts[CScriptID(redeemScript)] = redeemScript;
    return true;
}

bool CBasicKeyStore::HaveCScript(const CScriptID& hash) const
{
    LOCK(cs_KeyStore);
    return mapScripts.count(hash) > 0;
}

bool CBasicKeyStore::GetCScript(const CScriptID &hash, CScript& redeemScriptOut) const
{
    LOCK(cs_KeyStore);
    ScriptMap::const_iterator mi = mapScripts.find(hash);
    if (mi != mapScripts.end())
    {
        redeemScriptOut = (*mi).second;
        return true;
    }
    return false;
}

static bool ExtractPubKey(const CScript &dest, PublicKey& pubKeyOut)
{
    //TODO: Use Solver to extract this?
    CScript::const_iterator pc = dest.begin();
    opcodetype opcode;
    std::vector<unsigned char> vch;
    if (!dest.GetOp(pc, opcode, vch) ||!PublicKeyUtils::isValidSize(vch))
        return false;
    pubKeyOut = PublicKey(vch);
    if (!pubKeyOut.isFullyValid())
        return false;
    if (!dest.GetOp(pc, opcode, vch) || opcode != OP_CHECKSIG || dest.GetOp(pc, opcode, vch))
        return false;
    return true;
}

bool CBasicKeyStore::AddWatchOnly(const CScript &dest)
{
    LOCK(cs_KeyStore);
    setWatchOnly.insert(dest);
    PublicKey pubKey;
    if (ExtractPubKey(dest, pubKey))
        mapWatchKeys[pubKey.getKeyId()] = pubKey;
    return true;
}

bool CBasicKeyStore::RemoveWatchOnly(const CScript &dest)
{
    LOCK(cs_KeyStore);
    setWatchOnly.erase(dest);
    PublicKey pubKey;
    if (ExtractPubKey(dest, pubKey))
        mapWatchKeys.erase(pubKey.getKeyId());
    return true;
}

bool CBasicKeyStore::HaveWatchOnly(const CScript &dest) const
{
    LOCK(cs_KeyStore);
    return setWatchOnly.count(dest) > 0;
}

bool CBasicKeyStore::HaveWatchOnly() const
{
    LOCK(cs_KeyStore);
    return (!setWatchOnly.empty());
}