#define PPCOIN_KERNEL_H
#include "main.h"
+#include "wallet.h"
+
+// ChainDB upgrade time
+extern unsigned int nModifierUpgradeTime;
// MODIFIER_INTERVAL: time to elapse before new modifier is computed
-extern unsigned int nModifierInterval;
+extern const unsigned int nModifierInterval;
+
+extern bool fCoinsDataActual;
// MODIFIER_INTERVAL_RATIO:
// ratio of group interval length between the last group and the first group
static const int MODIFIER_INTERVAL_RATIO = 3;
+// Whether the given block is subject to new modifier protocol
+bool IsFixedModifierInterval(unsigned int nTimeBlock);
+
// Compute the hash modifier for proof-of-stake
-bool ComputeNextStakeModifier(const CBlockIndex* pindexPrev, uint64& nStakeModifier, bool& fGeneratedStakeModifier);
+bool ComputeNextStakeModifier(const CBlockIndex* pindexCurrent, uint64& nStakeModifier, bool& fGeneratedStakeModifier);
+
+// The stake modifier used to hash for a stake kernel is chosen as the stake
+// modifier about a selection interval later than the coin generating the kernel
+bool GetKernelStakeModifier(uint256 hashBlockFrom, uint64& nStakeModifier);
// Check whether stake kernel meets hash target
// Sets hashProofOfStake on success return
-bool CheckStakeKernelHash(unsigned int nBits, const CBlock& blockFrom, unsigned int nTxPrevOffset, const CTransaction& txPrev, const COutPoint& prevout, unsigned int nTimeTx, uint256& hashProofOfStake, bool fPrintProofOfStake=false);
+bool CheckStakeKernelHash(unsigned int nBits, const CBlock& blockFrom, unsigned int nTxPrevOffset, const CTransaction& txPrev, const COutPoint& prevout, unsigned int nTimeTx, uint256& hashProofOfStake, uint256& targetProofOfStake, bool fPrintProofOfStake=false);
+
+// Coins scanning options
+typedef struct KernelSearchSettings {
+ unsigned int nBits; // Packed difficulty
+ unsigned int nTime; // Basic time
+ unsigned int nOffset; // Offset inside CoinsSet (isn't used yet)
+ unsigned int nLimit; // Coins to scan (isn't used yet)
+ unsigned int nSearchInterval; // Number of seconds allowed to go into the past
+} KernelSearchSettings;
+
+typedef std::set<std::pair<const CWalletTx*,unsigned int> > CoinsSet;
+
+// Preloaded coins metadata
+// txid => ((txindex, (tx, vout.n)), (block, modifier))
+typedef std::map<std::pair<uint256, unsigned int>, std::pair<std::pair<CTxIndex, std::pair<const CWalletTx*,unsigned int> >, std::pair<CBlock, uint64> > > MetaMap;
+
+// Scan given coins set for kernel solution
+bool ScanForStakeKernelHash(MetaMap &mapMeta, KernelSearchSettings &settings, CoinsSet::value_type &kernelcoin, unsigned int &nTimeTx, unsigned int &nBlockTime);
// Check kernel hash target and coinstake signature
// Sets hashProofOfStake on success return
-bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hashProofOfStake);
-
-// Check whether the coinstake timestamp meets protocol
-bool CheckCoinStakeTimestamp(int64 nTimeBlock, int64 nTimeTx);
+bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hashProofOfStake, uint256& targetProofOfStake);
// Get stake modifier checksum
unsigned int GetStakeModifierChecksum(const CBlockIndex* pindex);
// Check stake modifier hard checkpoints
bool CheckStakeModifierCheckpoints(int nHeight, unsigned int nStakeModifierChecksum);
+// Get time weight using supplied timestamps
+int64 GetWeight(int64 nIntervalBeginning, int64 nIntervalEnd);
+
#endif // PPCOIN_KERNEL_H