// Copyright (c) 2010 Satoshi Nakamoto
// Copyright (c) 2009-2014 The Bitcoin developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include "chainparams.h"

#include "random.h"
#include "util.h"
#include "utilstrencodings.h"

#include <assert.h>

#include <boost/assign/list_of.hpp>

using namespace std;
using namespace boost::assign;

struct SeedSpec6 {
    uint8_t addr[16];
    uint16_t port;
};

#include "chainparamsseeds.h"

/**
 * Main network
 */

//! Convert the pnSeeds6 array into usable address objects.
static void convertSeed6(std::vector<CAddress> &vSeedsOut, const SeedSpec6 *data, unsigned int count)
{
    // It'll only connect to one or two seed nodes because once it connects,
    // it'll get a pile of addresses with newer timestamps.
    // Seed nodes are given a random 'last seen time' of between one and two
    // weeks ago.
    const int64_t nOneWeek = 7*24*60*60;
    for (unsigned int i = 0; i < count; i++)
    {
        struct in6_addr ip;
        memcpy(&ip, data[i].addr, sizeof(ip));
        CAddress addr(CService(ip, data[i].port));
        addr.nTime = GetTime() - GetRand(nOneWeek) - nOneWeek;
        vSeedsOut.push_back(addr);
    }
}

/**
 * What makes a good checkpoint block?
 * + Is surrounded by blocks with reasonable timestamps
 *   (no blocks before with a timestamp after, none after with
 *    timestamp before)
 * + Contains no strange transactions
 */
static Checkpoints::MapCheckpoints mapCheckpoints =
        boost::assign::map_list_of
        (  1500, uint256("0x841a2965955dd288cfa707a755d05a54e45f8bd476835ec9af4402a2b59a2967"))
        (  4032, uint256("0x9ce90e427198fc0ef05e5905ce3503725b80e26afd35a987965fd7e3d9cf0846"))
        (  8064, uint256("0xeb984353fc5190f210651f150c40b8a4bab9eeeff0b729fcb3987da694430d70"))
        ( 16128, uint256("0x602edf1859b7f9a6af809f1d9b0e6cb66fdc1d4d9dcd7a4bec03e12a1ccd153d"))
        ( 23420, uint256("0xd80fdf9ca81afd0bd2b2a90ac3a9fe547da58f2530ec874e978fce0b5101b507"))
        ( 50000, uint256("0x69dc37eb029b68f075a5012dcc0419c127672adb4f3a32882b2b3e71d07a20a6"))
        ( 80000, uint256("0x4fcb7c02f676a300503f49c764a89955a8f920b46a8cbecb4867182ecdb2e90a"))
        (120000, uint256("0xbd9d26924f05f6daa7f0155f32828ec89e8e29cee9e7121b026a7a3552ac6131"))
        (161500, uint256("0xdbe89880474f4bb4f75c227c77ba1cdc024991123b28b8418dbbf7798471ff43"))
        (179620, uint256("0x2ad9c65c990ac00426d18e446e0fd7be2ffa69e9a7dcb28358a50b2b78b9f709"))
        (240000, uint256("0x7140d1c4b4c2157ca217ee7636f24c9c73db39c4590c4e6eab2e3ea1555088aa"))
        (383640, uint256("0x2b6809f094a9215bafc65eb3f110a35127a34be94b7d0590a096c3f126c6f364"))
        (409004, uint256("0x487518d663d9f1fa08611d9395ad74d982b667fbdc0e77e9cf39b4f1355908a3"))
        (456000, uint256("0xbf34f71cc6366cd487930d06be22f897e34ca6a40501ac7d401be32456372004"))
        (638902, uint256("0x15238656e8ec63d28de29a8c75fcf3a5819afc953dcd9cc45cecc53baec74f38"))
        (721000, uint256("0x198a7b4de1df9478e2463bd99d75b714eab235a2e63e741641dc8a759a9840e5"))
        ;
static const Checkpoints::CCheckpointData data = {
        &mapCheckpoints,
        1422681363, // * UNIX timestamp of last checkpoint block
        5502192,   // * total number of transactions between genesis and last checkpoint
                    //   (the tx=... number in the SetBestChain debug.log lines)
        5500.0     // * estimated number of transactions per day after checkpoint
    };

static Checkpoints::MapCheckpoints mapCheckpointsTestnet =
        boost::assign::map_list_of
        ( 546, uint256("0xa0fea99a6897f531600c8ae53367b126824fd6a847b2b2b73817a95b8e27e602"))
        ;
static const Checkpoints::CCheckpointData dataTestnet = {
        &mapCheckpointsTestnet,
        1365458829,
        547,
        576
    };

static Checkpoints::MapCheckpoints mapCheckpointsRegtest =
        boost::assign::map_list_of
        ( 0, uint256("0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206"))
        ;
static const Checkpoints::CCheckpointData dataRegtest = {
        &mapCheckpointsRegtest,
        0,
        0,
        0
    };

class CMainParams : public CChainParams {
public:
    CMainParams() {
        networkID = CBaseChainParams::MAIN;
        strNetworkID = "main";
        /** 
         * The message start string is designed to be unlikely to occur in normal data.
         * The characters are rarely used upper ASCII, not valid as UTF-8, and produce
         * a large 4-byte int at any alignment.
         */
        pchMessageStart[0] = 0xfb;
        pchMessageStart[1] = 0xc0;
        pchMessageStart[2] = 0xb6;
        pchMessageStart[3] = 0xdb;
        vAlertPubKey = ParseHex("040184710fa689ad5023690c80f3a49c8f13f8d45b8c857fbcbc8bc4a8e4d3eb4b10f4d4604fa08dce601aaf0f470216fe1b51850b4acf21b179c45070ac7b03a9");
        nDefaultPort = 9333;
        bnProofOfWorkLimit = ~uint256(0) >> 20;
        nSubsidyHalvingInterval = 840000;
        nEnforceBlockUpgradeMajority = 750;
        nRejectBlockOutdatedMajority = 950;
        nToCheckBlockUpgradeMajority = 1000;
        nMinerThreads = 0;
        nTargetTimespan = 3.5 * 24 * 60 * 60; // 3.5 days
        nTargetSpacing = 2.5 * 60; // 2.5 minutes
        nMaxTipAge = 24 * 60 * 60;

        /**
         * Build the genesis block. Note that the output of the genesis coinbase cannot
         * be spent as it did not originally exist in the database.
         * 
         * CBlock(hash=000000000019d6, ver=1, hashPrevBlock=00000000000000, hashMerkleRoot=4a5e1e, nTime=1231006505, nBits=1d00ffff, nNonce=2083236893, vtx=1)
         *   CTransaction(hash=4a5e1e, ver=1, vin.size=1, vout.size=1, nLockTime=0)
         *     CTxIn(COutPoint(000000, -1), coinbase 04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73)
         *     CTxOut(nValue=50.00000000, scriptPubKey=0x5F1DF16B2B704C8A578D0B)
         *   vMerkleTree: 4a5e1e
         */
        const char* pszTimestamp = "NY Times 05/Oct/2011 Steve Jobs, Apple’s Visionary, Dies at 56";
        CMutableTransaction txNew;
        txNew.vin.resize(1);
        txNew.vout.resize(1);
        txNew.vin[0].scriptSig = CScript() << 486604799 << CScriptNum(4) << vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
        txNew.vout[0].nValue = 50 * COIN;
        txNew.vout[0].scriptPubKey = CScript() << ParseHex("040184710fa689ad5023690c80f3a49c8f13f8d45b8c857fbcbc8bc4a8e4d3eb4b10f4d4604fa08dce601aaf0f470216fe1b51850b4acf21b179c45070ac7b03a9") << OP_CHECKSIG;
        genesis.vtx.push_back(txNew);
        genesis.hashPrevBlock = 0;
        genesis.hashMerkleRoot = genesis.BuildMerkleTree();
        genesis.nVersion = 1;
        genesis.nTime    = 1317972665;
        genesis.nBits    = 0x1e0ffff0;
        genesis.nNonce   = 2084524493;

        hashGenesisBlock = genesis.GetHash();
        assert(hashGenesisBlock == uint256("0x12a765e31ffd4059bada1e25190f6e98c99d9714d334efa41a195a7e7e04bfe2"));
        assert(genesis.hashMerkleRoot == uint256("0x97ddfbbae6be97fd6cdf3e7ca13232a3afff2353e29badfab7f73011edd4ced9"));

        vSeeds.push_back(CDNSSeedData("litecointools.com", "dnsseed.litecointools.com"));
        vSeeds.push_back(CDNSSeedData("litecoinpool.org", "dnsseed.litecoinpool.org"));
        vSeeds.push_back(CDNSSeedData("xurious.com", "dnsseed.ltc.xurious.com"));
        vSeeds.push_back(CDNSSeedData("koin-project.com", "dnsseed.koin-project.com"));
        vSeeds.push_back(CDNSSeedData("weminemnc.com", "dnsseed.weminemnc.com"));
        vSeeds.push_back(CDNSSeedData("loshan.co.uk", "seed-a.litecoin.loshan.co.uk"));

        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,48);
        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,5);
        base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>(1,176);
        base58Prefixes[EXT_PUBLIC_KEY] = boost::assign::list_of(0x04)(0x88)(0xB2)(0x1E).convert_to_container<std::vector<unsigned char> >();
        base58Prefixes[EXT_SECRET_KEY] = boost::assign::list_of(0x04)(0x88)(0xAD)(0xE4).convert_to_container<std::vector<unsigned char> >();

        convertSeed6(vFixedSeeds, pnSeed6_main, ARRAYLEN(pnSeed6_main));

        fRequireRPCPassword = true;
        fMiningRequiresPeers = true;
        fAllowMinDifficultyBlocks = false;
        fDefaultConsistencyChecks = false;
        fRequireStandard = true;
        fMineBlocksOnDemand = false;
        fSkipProofOfWorkCheck = false;
        fTestnetToBeDeprecatedFieldRPC = false;

        // Litecoin: Mainnet v2 enforced as of block 710k
        nEnforceV2AfterHeight = 710000;
    }

    const Checkpoints::CCheckpointData& Checkpoints() const 
    {
        return data;
    }
};
static CMainParams mainParams;

/**
 * Testnet (v3)
 */
class CTestNetParams : public CMainParams {
public:
    CTestNetParams() {
        networkID = CBaseChainParams::TESTNET;
        strNetworkID = "test";
        pchMessageStart[0] = 0xfc;
        pchMessageStart[1] = 0xc1;
        pchMessageStart[2] = 0xb7;
        pchMessageStart[3] = 0xdc;
        vAlertPubKey = ParseHex("0449623fc74489a947c4b15d579115591add020e53b3490bf47297dfa3762250625f8ecc2fb4fc59f69bdce8f7080f3167808276ed2c79d297054367566038aa82");
        nDefaultPort = 19333;
        nEnforceBlockUpgradeMajority = 51;
        nRejectBlockOutdatedMajority = 75;
        nToCheckBlockUpgradeMajority = 100;
        nMinerThreads = 0;
        nTargetTimespan = 3.5 * 24 * 60 * 60; // 3.5 days
        nTargetSpacing = 2.5 * 60; // 2.5 minutes
        nMaxTipAge = 0x7fffffff;

        //! Modify the testnet genesis block so the timestamp is valid for a later start.
        genesis.nTime = 1317798646;
        genesis.nNonce = 385270584;
        hashGenesisBlock = genesis.GetHash();
        assert(hashGenesisBlock == uint256("0xf5ae71e26c74beacc88382716aced69cddf3dffff24f384e1808905e0188f68f"));

        vFixedSeeds.clear();
        vSeeds.clear();
        vSeeds.push_back(CDNSSeedData("litecointools.com", "testnet-seed.litecointools.com"));
        vSeeds.push_back(CDNSSeedData("xurious.com", "testnet-seed.ltc.xurious.com"));
        vSeeds.push_back(CDNSSeedData("wemine-testnet.com", "dnsseed.wemine-testnet.com"));

        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,111);
        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,196);
        base58Prefixes[SECRET_KEY]     = std::vector<unsigned char>(1,239);
        base58Prefixes[EXT_PUBLIC_KEY] = boost::assign::list_of(0x04)(0x35)(0x87)(0xCF).convert_to_container<std::vector<unsigned char> >();
        base58Prefixes[EXT_SECRET_KEY] = boost::assign::list_of(0x04)(0x35)(0x83)(0x94).convert_to_container<std::vector<unsigned char> >();

        convertSeed6(vFixedSeeds, pnSeed6_test, ARRAYLEN(pnSeed6_test));

        fRequireRPCPassword = true;
        fMiningRequiresPeers = true;
        fAllowMinDifficultyBlocks = true;
        fDefaultConsistencyChecks = false;
        fRequireStandard = false;
        fMineBlocksOnDemand = false;
        fTestnetToBeDeprecatedFieldRPC = true;

        // Litecoin: Testnet v2 enforced as of block 400k
        nEnforceV2AfterHeight = 400000;
    }
    const Checkpoints::CCheckpointData& Checkpoints() const 
    {
        return dataTestnet;
    }
};
static CTestNetParams testNetParams;

/**
 * Regression test
 */
class CRegTestParams : public CTestNetParams {
public:
    CRegTestParams() {
        networkID = CBaseChainParams::REGTEST;
        strNetworkID = "regtest";
        pchMessageStart[0] = 0xfa;
        pchMessageStart[1] = 0xbf;
        pchMessageStart[2] = 0xb5;
        pchMessageStart[3] = 0xda;
        nSubsidyHalvingInterval = 150;
        nEnforceBlockUpgradeMajority = 750;
        nRejectBlockOutdatedMajority = 950;
        nToCheckBlockUpgradeMajority = 1000;
        nMinerThreads = 1;
        nTargetTimespan = 3.5 * 24 * 60 * 60; // 3.5 days
        nTargetSpacing = 2.5 * 60; // 2.5 minutes
        bnProofOfWorkLimit = ~uint256(0) >> 1;
        nMaxTipAge = 24 * 60 * 60;
        genesis.nTime = 1296688602;
        genesis.nBits = 0x207fffff;
        genesis.nNonce = 0;
        hashGenesisBlock = genesis.GetHash();
        nDefaultPort = 19444;
        assert(hashGenesisBlock == uint256("0x530827f38f93b43ed12af0b3ad25a288dc02ed74d6d7857862df51fc56c416f9"));

        vFixedSeeds.clear(); //! Regtest mode doesn't have any fixed seeds.
        vSeeds.clear();  //! Regtest mode doesn't have any DNS seeds.

        fRequireRPCPassword = false;
        fMiningRequiresPeers = false;
        fAllowMinDifficultyBlocks = true;
        fDefaultConsistencyChecks = true;
        fRequireStandard = false;
        fMineBlocksOnDemand = true;
        fTestnetToBeDeprecatedFieldRPC = false;

        // Litecoin: v2 enforced using Bitcoin's supermajority rule
        nEnforceV2AfterHeight = -1;
    }
    const Checkpoints::CCheckpointData& Checkpoints() const 
    {
        return dataRegtest;
    }
};
static CRegTestParams regTestParams;

/**
 * Unit test
 */
class CUnitTestParams : public CMainParams, public CModifiableParams {
public:
    CUnitTestParams() {
        networkID = CBaseChainParams::UNITTEST;
        strNetworkID = "unittest";
        nDefaultPort = 18445;
        vFixedSeeds.clear(); //! Unit test mode doesn't have any fixed seeds.
        vSeeds.clear();  //! Unit test mode doesn't have any DNS seeds.

        fRequireRPCPassword = false;
        fMiningRequiresPeers = false;
        fDefaultConsistencyChecks = true;
        fAllowMinDifficultyBlocks = false;
        fMineBlocksOnDemand = true;

        // Litecoin: v2 enforced using Bitcoin's supermajority rule
        nEnforceV2AfterHeight = -1;
    }

    const Checkpoints::CCheckpointData& Checkpoints() const 
    {
        // UnitTest share the same checkpoints as MAIN
        return data;
    }

    //! Published setters to allow changing values in unit test cases
    virtual void setSubsidyHalvingInterval(int anSubsidyHalvingInterval)  { nSubsidyHalvingInterval=anSubsidyHalvingInterval; }
    virtual void setEnforceBlockUpgradeMajority(int anEnforceBlockUpgradeMajority)  { nEnforceBlockUpgradeMajority=anEnforceBlockUpgradeMajority; }
    virtual void setRejectBlockOutdatedMajority(int anRejectBlockOutdatedMajority)  { nRejectBlockOutdatedMajority=anRejectBlockOutdatedMajority; }
    virtual void setToCheckBlockUpgradeMajority(int anToCheckBlockUpgradeMajority)  { nToCheckBlockUpgradeMajority=anToCheckBlockUpgradeMajority; }
    virtual void setDefaultConsistencyChecks(bool afDefaultConsistencyChecks)  { fDefaultConsistencyChecks=afDefaultConsistencyChecks; }
    virtual void setAllowMinDifficultyBlocks(bool afAllowMinDifficultyBlocks) {  fAllowMinDifficultyBlocks=afAllowMinDifficultyBlocks; }
    virtual void setSkipProofOfWorkCheck(bool afSkipProofOfWorkCheck) { fSkipProofOfWorkCheck = afSkipProofOfWorkCheck; }
};
static CUnitTestParams unitTestParams;


static CChainParams *pCurrentParams = 0;

CModifiableParams *ModifiableParams()
{
   assert(pCurrentParams);
   assert(pCurrentParams==&unitTestParams);
   return (CModifiableParams*)&unitTestParams;
}

const CChainParams &Params() {
    assert(pCurrentParams);
    return *pCurrentParams;
}

CChainParams &Params(CBaseChainParams::Network network) {
    switch (network) {
        case CBaseChainParams::MAIN:
            return mainParams;
        case CBaseChainParams::TESTNET:
            return testNetParams;
        case CBaseChainParams::REGTEST:
            return regTestParams;
        case CBaseChainParams::UNITTEST:
            return unitTestParams;
        default:
            assert(false && "Unimplemented network");
            return mainParams;
    }
}

void SelectParams(CBaseChainParams::Network network) {
    SelectBaseParams(network);
    pCurrentParams = &Params(network);
}

bool SelectParamsFromCommandLine()
{
    CBaseChainParams::Network network = NetworkIdFromCommandLine();
    if (network == CBaseChainParams::MAX_NETWORK_TYPES)
        return false;

    SelectParams(network);
    return true;
}