// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2016 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_NET_PROCESSING_H
#define BITCOIN_NET_PROCESSING_H

#include "net.h"
#include "validationinterface.h"

/** Default for -maxorphantx, maximum number of orphan transactions kept in memory */
static const unsigned int DEFAULT_MAX_ORPHAN_TRANSACTIONS = 100;
/** Expiration time for orphan transactions in seconds */
static const int64_t ORPHAN_TX_EXPIRE_TIME = 20 * 60;
/** Minimum time between orphan transactions expire time checks in seconds */
static const int64_t ORPHAN_TX_EXPIRE_INTERVAL = 5 * 60;
/** Default number of orphan+recently-replaced txn to keep around for block reconstruction */
static const unsigned int DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN = 100;
/** Headers download timeout expressed in microseconds
 *  Timeout = base + per_header * (expected number of headers) */
static constexpr int64_t HEADERS_DOWNLOAD_TIMEOUT_BASE = 15 * 60 * 1000000; // 15 minutes
static constexpr int64_t HEADERS_DOWNLOAD_TIMEOUT_PER_HEADER = 1000; // 1ms/header
/** Sets a hard minimum to the multiplier used for block download 
 * timeouts, only triggers on regtest, where nPowTargetTimespan
 * is set to 1 second.
 */
static constexpr int64_t MIN_BLOCK_DOWNLOAD_MULTIPLIER = 10; // 10 seconds
/** Register with a network node to receive its signals */
void RegisterNodeSignals(CNodeSignals& nodeSignals);
/** Unregister a network node */
void UnregisterNodeSignals(CNodeSignals& nodeSignals);

class PeerLogicValidation : public CValidationInterface {
private:
    CConnman* connman;

public:
    PeerLogicValidation(CConnman* connmanIn);

    virtual void SyncTransaction(const CTransaction& tx, const CBlockIndex* pindex, int nPosInBlock);
    virtual void UpdatedBlockTip(const CBlockIndex *pindexNew, const CBlockIndex *pindexFork, bool fInitialDownload);
    virtual void BlockChecked(const CBlock& block, const CValidationState& state);
    virtual void NewPoWValidBlock(const CBlockIndex *pindex, const std::shared_ptr<const CBlock>& pblock);
};

struct CNodeStateStats {
    int nMisbehavior;
    int nSyncHeight;
    int nCommonHeight;
    std::vector<int> vHeightInFlight;
};

/** Get statistics from node state */
bool GetNodeStateStats(NodeId nodeid, CNodeStateStats &stats);
/** Increase a node's misbehavior score. */
void Misbehaving(NodeId nodeid, int howmuch);

/** Process protocol messages received from a given node */
bool ProcessMessages(CNode* pfrom, CConnman& connman, const std::atomic<bool>& interrupt);
/**
 * Send queued protocol messages to be sent to a give node.
 *
 * @param[in]   pto             The node which we are sending messages to.
 * @param[in]   connman         The connection manager for that node.
 * @param[in]   interrupt       Interrupt condition for processing threads
 * @return                      True if there is more work to be done
 */
bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interrupt);

#endif // BITCOIN_NET_PROCESSING_H