// Copyright (c) 2012-2018 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <wallet/wallet.h>

#include <memory>
#include <set>
#include <stdint.h>
#include <utility>
#include <vector>

#include <consensus/validation.h>
#include <rpc/server.h>
#include <test/test_bitcoin.h>
#include <validation.h>
#include <wallet/coincontrol.h>
#include <wallet/test/wallet_test_fixture.h>

#include <boost/test/unit_test.hpp>
#include <univalue.h>

extern UniValue importmulti(const JSONRPCRequest& request);
extern UniValue dumpwallet(const JSONRPCRequest& request);
extern UniValue importwallet(const JSONRPCRequest& request);

BOOST_FIXTURE_TEST_SUITE(wallet_tests, WalletTestingSetup)

static void AddKey(CWallet& wallet, const CKey& key)
{
    LOCK(wallet.cs_wallet);
    wallet.AddKeyPubKey(key, key.GetPubKey());
}

BOOST_FIXTURE_TEST_CASE(rescan, TestChain100Setup)
{
    // Cap last block file size, and mine new block in a new block file.
    CBlockIndex* const nullBlock = nullptr;
    CBlockIndex* oldTip = chainActive.Tip();
    GetBlockFileInfo(oldTip->GetBlockPos().nFile)->nSize = MAX_BLOCKFILE_SIZE;
    CreateAndProcessBlock({}, GetScriptForRawPubKey(coinbaseKey.GetPubKey()));
    CBlockIndex* newTip = chainActive.Tip();

    LOCK(cs_main);

    // Verify ScanForWalletTransactions picks up transactions in both the old
    // and new block files.
    {
        CWallet wallet("dummy", WalletDatabase::CreateDummy());
        AddKey(wallet, coinbaseKey);
        WalletRescanReserver reserver(&wallet);
        reserver.reserve();
        BOOST_CHECK_EQUAL(nullBlock, wallet.ScanForWalletTransactions(oldTip, nullptr, reserver));
        BOOST_CHECK_EQUAL(wallet.GetImmatureBalance(), 100 * COIN);
    }

    // Prune the older block file.
    PruneOneBlockFile(oldTip->GetBlockPos().nFile);
    UnlinkPrunedFiles({oldTip->GetBlockPos().nFile});

    // Verify ScanForWalletTransactions only picks transactions in the new block
    // file.
    {
        CWallet wallet("dummy", WalletDatabase::CreateDummy());
        AddKey(wallet, coinbaseKey);
        WalletRescanReserver reserver(&wallet);
        reserver.reserve();
        BOOST_CHECK_EQUAL(oldTip, wallet.ScanForWalletTransactions(oldTip, nullptr, reserver));
        BOOST_CHECK_EQUAL(wallet.GetImmatureBalance(), 50 * COIN);
    }

    // Verify importmulti RPC returns failure for a key whose creation time is
    // before the missing block, and success for a key whose creation time is
    // after.
    {
        std::shared_ptr<CWallet> wallet = std::make_shared<CWallet>("dummy", WalletDatabase::CreateDummy());
        AddWallet(wallet);
        UniValue keys;
        keys.setArray();
        UniValue key;
        key.setObject();
        key.pushKV("scriptPubKey", HexStr(GetScriptForRawPubKey(coinbaseKey.GetPubKey())));
        key.pushKV("timestamp", 0);
        key.pushKV("internal", UniValue(true));
        keys.push_back(key);
        key.clear();
        key.setObject();
        CKey futureKey;
        futureKey.MakeNewKey(true);
        key.pushKV("scriptPubKey", HexStr(GetScriptForRawPubKey(futureKey.GetPubKey())));
        key.pushKV("timestamp", newTip->GetBlockTimeMax() + TIMESTAMP_WINDOW + 1);
        key.pushKV("internal", UniValue(true));
        keys.push_back(key);
        JSONRPCRequest request;
        request.params.setArray();
        request.params.push_back(keys);

        UniValue response = importmulti(request);
        BOOST_CHECK_EQUAL(response.write(),
            strprintf("[{\"success\":false,\"error\":{\"code\":-1,\"message\":\"Rescan failed for key with creation "
                      "timestamp %d. There was an error reading a block from time %d, which is after or within %d "
                      "seconds of key creation, and could contain transactions pertaining to the key. As a result, "
                      "transactions and coins using this key may not appear in the wallet. This error could be caused "
                      "by pruning or data corruption (see bitcoind log for details) and could be dealt with by "
                      "downloading and rescanning the relevant blocks (see -reindex and -rescan "
                      "options).\"}},{\"success\":true}]",
                              0, oldTip->GetBlockTimeMax(), TIMESTAMP_WINDOW));
        RemoveWallet(wallet);
    }
}

// Verify importwallet RPC starts rescan at earliest block with timestamp
// greater or equal than key birthday. Previously there was a bug where
// importwallet RPC would start the scan at the latest block with timestamp less
// than or equal to key birthday.
BOOST_FIXTURE_TEST_CASE(importwallet_rescan, TestChain100Setup)
{
    // Create two blocks with same timestamp to verify that importwallet rescan
    // will pick up both blocks, not just the first.
    const int64_t BLOCK_TIME = chainActive.Tip()->GetBlockTimeMax() + 5;
    SetMockTime(BLOCK_TIME);
    m_coinbase_txns.emplace_back(CreateAndProcessBlock({}, GetScriptForRawPubKey(coinbaseKey.GetPubKey())).vtx[0]);
    m_coinbase_txns.emplace_back(CreateAndProcessBlock({}, GetScriptForRawPubKey(coinbaseKey.GetPubKey())).vtx[0]);

    // Set key birthday to block time increased by the timestamp window, so
    // rescan will start at the block time.
    const int64_t KEY_TIME = BLOCK_TIME + TIMESTAMP_WINDOW;
    SetMockTime(KEY_TIME);
    m_coinbase_txns.emplace_back(CreateAndProcessBlock({}, GetScriptForRawPubKey(coinbaseKey.GetPubKey())).vtx[0]);

    LOCK(cs_main);

    std::string backup_file = (SetDataDir("importwallet_rescan") / "wallet.backup").string();

    // Import key into wallet and call dumpwallet to create backup file.
    {
        std::shared_ptr<CWallet> wallet = std::make_shared<CWallet>("dummy", WalletDatabase::CreateDummy());
        LOCK(wallet->cs_wallet);
        wallet->mapKeyMetadata[coinbaseKey.GetPubKey().GetID()].nCreateTime = KEY_TIME;
        wallet->AddKeyPubKey(coinbaseKey, coinbaseKey.GetPubKey());

        JSONRPCRequest request;
        request.params.setArray();
        request.params.push_back(backup_file);
        AddWallet(wallet);
        ::dumpwallet(request);
        RemoveWallet(wallet);
    }

    // Call importwallet RPC and verify all blocks with timestamps >= BLOCK_TIME
    // were scanned, and no prior blocks were scanned.
    {
        std::shared_ptr<CWallet> wallet = std::make_shared<CWallet>("dummy", WalletDatabase::CreateDummy());

        JSONRPCRequest request;
        request.params.setArray();
        request.params.push_back(backup_file);
        AddWallet(wallet);
        ::importwallet(request);
        RemoveWallet(wallet);

        LOCK(wallet->cs_wallet);
        BOOST_CHECK_EQUAL(wallet->mapWallet.size(), 3U);
        BOOST_CHECK_EQUAL(m_coinbase_txns.size(), 103U);
        for (size_t i = 0; i < m_coinbase_txns.size(); ++i) {
            bool found = wallet->GetWalletTx(m_coinbase_txns[i]->GetHash());
            bool expected = i >= 100;
            BOOST_CHECK_EQUAL(found, expected);
        }
    }

    SetMockTime(0);
}

// Check that GetImmatureCredit() returns a newly calculated value instead of
// the cached value after a MarkDirty() call.
//
// This is a regression test written to verify a bugfix for the immature credit
// function. Similar tests probably should be written for the other credit and
// debit functions.
BOOST_FIXTURE_TEST_CASE(coin_mark_dirty_immature_credit, TestChain100Setup)
{
    CWallet wallet("dummy", WalletDatabase::CreateDummy());
    CWalletTx wtx(&wallet, m_coinbase_txns.back());
    LOCK2(cs_main, wallet.cs_wallet);
    wtx.hashBlock = chainActive.Tip()->GetBlockHash();
    wtx.nIndex = 0;

    // Call GetImmatureCredit() once before adding the key to the wallet to
    // cache the current immature credit amount, which is 0.
    BOOST_CHECK_EQUAL(wtx.GetImmatureCredit(), 0);

    // Invalidate the cached value, add the key, and make sure a new immature
    // credit amount is calculated.
    wtx.MarkDirty();
    wallet.AddKeyPubKey(coinbaseKey, coinbaseKey.GetPubKey());
    BOOST_CHECK_EQUAL(wtx.GetImmatureCredit(), 50*COIN);
}

static int64_t AddTx(CWallet& wallet, uint32_t lockTime, int64_t mockTime, int64_t blockTime)
{
    CMutableTransaction tx;
    tx.nLockTime = lockTime;
    SetMockTime(mockTime);
    CBlockIndex* block = nullptr;
    if (blockTime > 0) {
        LOCK(cs_main);
        auto inserted = mapBlockIndex.emplace(GetRandHash(), new CBlockIndex);
        assert(inserted.second);
        const uint256& hash = inserted.first->first;
        block = inserted.first->second;
        block->nTime = blockTime;
        block->phashBlock = &hash;
    }

    CWalletTx wtx(&wallet, MakeTransactionRef(tx));
    if (block) {
        wtx.SetMerkleBranch(block, 0);
    }
    {
        LOCK(cs_main);
        wallet.AddToWallet(wtx);
    }
    LOCK(wallet.cs_wallet);
    return wallet.mapWallet.at(wtx.GetHash()).nTimeSmart;
}

// Simple test to verify assignment of CWalletTx::nSmartTime value. Could be
// expanded to cover more corner cases of smart time logic.
BOOST_AUTO_TEST_CASE(ComputeTimeSmart)
{
    // New transaction should use clock time if lower than block time.
    BOOST_CHECK_EQUAL(AddTx(m_wallet, 1, 100, 120), 100);

    // Test that updating existing transaction does not change smart time.
    BOOST_CHECK_EQUAL(AddTx(m_wallet, 1, 200, 220), 100);

    // New transaction should use clock time if there's no block time.
    BOOST_CHECK_EQUAL(AddTx(m_wallet, 2, 300, 0), 300);

    // New transaction should use block time if lower than clock time.
    BOOST_CHECK_EQUAL(AddTx(m_wallet, 3, 420, 400), 400);

    // New transaction should use latest entry time if higher than
    // min(block time, clock time).
    BOOST_CHECK_EQUAL(AddTx(m_wallet, 4, 500, 390), 400);

    // If there are future entries, new transaction should use time of the
    // newest entry that is no more than 300 seconds ahead of the clock time.
    BOOST_CHECK_EQUAL(AddTx(m_wallet, 5, 50, 600), 300);

    // Reset mock time for other tests.
    SetMockTime(0);
}

BOOST_AUTO_TEST_CASE(LoadReceiveRequests)
{
    CTxDestination dest = CKeyID();
    LOCK(m_wallet.cs_wallet);
    m_wallet.AddDestData(dest, "misc", "val_misc");
    m_wallet.AddDestData(dest, "rr0", "val_rr0");
    m_wallet.AddDestData(dest, "rr1", "val_rr1");

    auto values = m_wallet.GetDestValues("rr");
    BOOST_CHECK_EQUAL(values.size(), 2U);
    BOOST_CHECK_EQUAL(values[0], "val_rr0");
    BOOST_CHECK_EQUAL(values[1], "val_rr1");
}

class ListCoinsTestingSetup : public TestChain100Setup
{
public:
    ListCoinsTestingSetup()
    {
        CreateAndProcessBlock({}, GetScriptForRawPubKey(coinbaseKey.GetPubKey()));
        wallet = MakeUnique<CWallet>("mock", WalletDatabase::CreateMock());
        bool firstRun;
        wallet->LoadWallet(firstRun);
        AddKey(*wallet, coinbaseKey);
        WalletRescanReserver reserver(wallet.get());
        reserver.reserve();
        wallet->ScanForWalletTransactions(chainActive.Genesis(), nullptr, reserver);
    }

    ~ListCoinsTestingSetup()
    {
        wallet.reset();
    }

    CWalletTx& AddTx(CRecipient recipient)
    {
        CTransactionRef tx;
        CReserveKey reservekey(wallet.get());
        CAmount fee;
        int changePos = -1;
        std::string error;
        CCoinControl dummy;
        BOOST_CHECK(wallet->CreateTransaction({recipient}, tx, reservekey, fee, changePos, error, dummy));
        CValidationState state;
        BOOST_CHECK(wallet->CommitTransaction(tx, {}, {}, reservekey, nullptr, state));
        CMutableTransaction blocktx;
        {
            LOCK(wallet->cs_wallet);
            blocktx = CMutableTransaction(*wallet->mapWallet.at(tx->GetHash()).tx);
        }
        CreateAndProcessBlock({CMutableTransaction(blocktx)}, GetScriptForRawPubKey(coinbaseKey.GetPubKey()));
        LOCK(wallet->cs_wallet);
        auto it = wallet->mapWallet.find(tx->GetHash());
        BOOST_CHECK(it != wallet->mapWallet.end());
        it->second.SetMerkleBranch(chainActive.Tip(), 1);
        return it->second;
    }

    std::unique_ptr<CWallet> wallet;
};

BOOST_FIXTURE_TEST_CASE(ListCoins, ListCoinsTestingSetup)
{
    std::string coinbaseAddress = coinbaseKey.GetPubKey().GetID().ToString();

    // Confirm ListCoins initially returns 1 coin grouped under coinbaseKey
    // address.
    auto list = wallet->ListCoins();
    BOOST_CHECK_EQUAL(list.size(), 1U);
    BOOST_CHECK_EQUAL(boost::get<CKeyID>(list.begin()->first).ToString(), coinbaseAddress);
    BOOST_CHECK_EQUAL(list.begin()->second.size(), 1U);

    // Check initial balance from one mature coinbase transaction.
    BOOST_CHECK_EQUAL(50 * COIN, wallet->GetAvailableBalance());

    // Add a transaction creating a change address, and confirm ListCoins still
    // returns the coin associated with the change address underneath the
    // coinbaseKey pubkey, even though the change address has a different
    // pubkey.
    AddTx(CRecipient{GetScriptForRawPubKey({}), 1 * COIN, false /* subtract fee */});
    list = wallet->ListCoins();
    BOOST_CHECK_EQUAL(list.size(), 1U);
    BOOST_CHECK_EQUAL(boost::get<CKeyID>(list.begin()->first).ToString(), coinbaseAddress);
    BOOST_CHECK_EQUAL(list.begin()->second.size(), 2U);

    // Lock both coins. Confirm number of available coins drops to 0.
    {
        LOCK2(cs_main, wallet->cs_wallet);
        std::vector<COutput> available;
        wallet->AvailableCoins(available);
        BOOST_CHECK_EQUAL(available.size(), 2U);
    }
    for (const auto& group : list) {
        for (const auto& coin : group.second) {
            LOCK(wallet->cs_wallet);
            wallet->LockCoin(COutPoint(coin.tx->GetHash(), coin.i));
        }
    }
    {
        LOCK2(cs_main, wallet->cs_wallet);
        std::vector<COutput> available;
        wallet->AvailableCoins(available);
        BOOST_CHECK_EQUAL(available.size(), 0U);
    }
    // Confirm ListCoins still returns same result as before, despite coins
    // being locked.
    list = wallet->ListCoins();
    BOOST_CHECK_EQUAL(list.size(), 1U);
    BOOST_CHECK_EQUAL(boost::get<CKeyID>(list.begin()->first).ToString(), coinbaseAddress);
    BOOST_CHECK_EQUAL(list.begin()->second.size(), 2U);
}

BOOST_FIXTURE_TEST_CASE(wallet_disableprivkeys, TestChain100Setup)
{
    std::shared_ptr<CWallet> wallet = std::make_shared<CWallet>("dummy", WalletDatabase::CreateDummy());
    wallet->SetWalletFlag(WALLET_FLAG_DISABLE_PRIVATE_KEYS);
    BOOST_CHECK(!wallet->TopUpKeyPool(1000));
    CPubKey pubkey;
    BOOST_CHECK(!wallet->GetKeyFromPool(pubkey, false));
}

BOOST_AUTO_TEST_SUITE_END()