package zkproof

import (
	"io/ioutil"
	"os"
	"strconv"
	"testing"
	"time"

	ethCommon "github.com/ethereum/go-ethereum/common"
	ethCrypto "github.com/ethereum/go-ethereum/crypto"
	"github.com/hermeznetwork/hermez-node/batchbuilder"
	"github.com/hermeznetwork/hermez-node/common"
	dbUtils "github.com/hermeznetwork/hermez-node/db"
	"github.com/hermeznetwork/hermez-node/db/historydb"
	"github.com/hermeznetwork/hermez-node/db/l2db"
	"github.com/hermeznetwork/hermez-node/db/statedb"
	"github.com/hermeznetwork/hermez-node/log"
	"github.com/hermeznetwork/hermez-node/test"
	"github.com/hermeznetwork/hermez-node/test/til"
	"github.com/hermeznetwork/hermez-node/test/txsets"
	"github.com/hermeznetwork/hermez-node/txselector"
	"github.com/jmoiron/sqlx"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func addTokens(t *testing.T, tc *til.Context, db *sqlx.DB) {
	var tokens []common.Token
	for i := 0; i < int(tc.LastRegisteredTokenID); i++ {
		tokens = append(tokens, common.Token{
			TokenID:     common.TokenID(i + 1),
			EthBlockNum: 1,
			EthAddr:     ethCommon.BytesToAddress([]byte{byte(i + 1)}),
			Name:        strconv.Itoa(i),
			Symbol:      strconv.Itoa(i),
			Decimals:    18,
		})
	}

	hdb := historydb.NewHistoryDB(db, nil)
	assert.NoError(t, hdb.AddBlock(&common.Block{
		Num: 1,
	}))
	assert.NoError(t, hdb.AddTokens(tokens))
}

func addL2Txs(t *testing.T, l2DB *l2db.L2DB, poolL2Txs []common.PoolL2Tx) {
	for i := 0; i < len(poolL2Txs); i++ {
		err := l2DB.AddTxTest(&poolL2Txs[i])
		if err != nil {
			log.Error(err)
		}
		require.NoError(t, err)
	}
}

func addAccCreationAuth(t *testing.T, tc *til.Context, l2DB *l2db.L2DB, chainID uint16, hermezContractAddr ethCommon.Address, username string) []byte {
	user := tc.Users[username]
	auth := &common.AccountCreationAuth{
		EthAddr: user.Addr,
		BJJ:     user.BJJ.Public().Compress(),
	}
	err := auth.Sign(func(hash []byte) ([]byte, error) {
		return ethCrypto.Sign(hash, user.EthSk)
	}, chainID, hermezContractAddr)
	assert.NoError(t, err)

	err = l2DB.AddAccountCreationAuth(auth)
	assert.NoError(t, err)
	return auth.Signature
}

func initTxSelector(t *testing.T, chainID uint16, hermezContractAddr ethCommon.Address, coordUser *til.User) (*txselector.TxSelector, *l2db.L2DB, *statedb.StateDB) {
	pass := os.Getenv("POSTGRES_PASS")
	db, err := dbUtils.InitSQLDB(5432, "localhost", "hermez", pass, "hermez")
	require.NoError(t, err)
	l2DB := l2db.NewL2DB(db, 10, 100, 24*time.Hour, nil)

	dir, err := ioutil.TempDir("", "tmpSyncDB")
	require.NoError(t, err)
	defer assert.NoError(t, os.RemoveAll(dir))
	syncStateDB, err := statedb.NewStateDB(statedb.Config{Path: dir, Keep: 128,
		Type: statedb.TypeSynchronizer, NLevels: 0})
	require.NoError(t, err)

	txselDir, err := ioutil.TempDir("", "tmpTxSelDB")
	require.NoError(t, err)
	defer assert.NoError(t, os.RemoveAll(dir))

	// use Til Coord keys for tests compatibility
	coordAccount := &txselector.CoordAccount{
		Addr:                coordUser.Addr,
		BJJ:                 coordUser.BJJ.Public().Compress(),
		AccountCreationAuth: nil,
	}
	auth := common.AccountCreationAuth{
		EthAddr: coordUser.Addr,
		BJJ:     coordUser.BJJ.Public().Compress(),
	}
	err = auth.Sign(func(hash []byte) ([]byte, error) {
		return ethCrypto.Sign(hash, coordUser.EthSk)
	}, chainID, hermezContractAddr)
	assert.NoError(t, err)
	coordAccount.AccountCreationAuth = auth.Signature

	txsel, err := txselector.NewTxSelector(coordAccount, txselDir, syncStateDB, l2DB)
	require.NoError(t, err)

	test.WipeDB(l2DB.DB())

	return txsel, l2DB, syncStateDB
}

func TestTxSelectorBatchBuilderZKInputsMinimumFlow0(t *testing.T) {
	tc := til.NewContext(ChainID, common.RollupConstMaxL1UserTx)
	// generate test transactions, the L1CoordinatorTxs generated by Til
	// will be ignored at this test, as will be the TxSelector who
	// generates them when needed
	blocks, err := tc.GenerateBlocks(txsets.SetBlockchainMinimumFlow0)
	require.NoError(t, err)

	hermezContractAddr := ethCommon.HexToAddress("0xc344E203a046Da13b0B4467EB7B3629D0C99F6E6")
	txsel, l2DBTxSel, syncStateDB := initTxSelector(t, ChainID, hermezContractAddr, tc.Users["Coord"])

	bbDir, err := ioutil.TempDir("", "tmpBatchBuilderDB")
	require.NoError(t, err)
	bb, err := batchbuilder.NewBatchBuilder(bbDir, syncStateDB, 0, NLevels)
	require.NoError(t, err)

	// restart nonces of TilContext, as will be set by generating directly
	// the PoolL2Txs for each specific batch with tc.GeneratePoolL2Txs
	tc.RestartNonces()

	// add tokens to HistoryDB to avoid breaking FK constrains
	addTokens(t, tc, l2DBTxSel.DB())

	selectionConfig := &txselector.SelectionConfig{
		MaxL1UserTxs:      100, // TODO
		TxProcessorConfig: txprocConfig,
	}
	configBatch := &batchbuilder.ConfigBatch{
		// ForgerAddress:
		TxProcessorConfig: txprocConfig,
	}

	// loop over the first 6 batches
	expectedRoots := []string{"0", "0", "13644148972047617726265275926674266298636745191961029124811988256139761111521", "12433441613247342495680642890662773367605896324555599297255745922589338651261", "12433441613247342495680642890662773367605896324555599297255745922589338651261", "4191361650490017591061467288209836928064232431729236465872209988325272262963"}
	for i := 0; i < 6; i++ {
		log.Debugf("block:0 batch:%d", i+1)
		var l1UserTxs []common.L1Tx
		if blocks[0].Rollup.Batches[i].Batch.ForgeL1TxsNum != nil {
			l1UserTxs = til.L1TxsToCommonL1Txs(tc.Queues[*blocks[0].Rollup.Batches[i].Batch.ForgeL1TxsNum])
		}
		// TxSelector select the transactions for the next Batch
		coordIdxs, _, oL1UserTxs, oL1CoordTxs, oL2Txs, _, err := txsel.GetL1L2TxSelection(selectionConfig, l1UserTxs)
		require.NoError(t, err)
		// BatchBuilder build Batch
		zki, err := bb.BuildBatch(coordIdxs, configBatch, oL1UserTxs, oL1CoordTxs, oL2Txs)
		require.NoError(t, err)
		assert.Equal(t, expectedRoots[i], bb.LocalStateDB().MT.Root().BigInt().String())
		sendProofAndCheckResp(t, zki)
	}

	log.Debug("block:0 batch:7")
	// simulate the PoolL2Txs of the batch6
	batchPoolL2 := `
	Type: PoolL2
	PoolTransferToEthAddr(1) A-B: 200 (126)
	PoolTransferToEthAddr(0) B-C: 100 (126)`
	l2Txs, err := tc.GeneratePoolL2Txs(batchPoolL2)
	require.NoError(t, err)
	// add AccountCreationAuths that will be used at the next batch
	_ = addAccCreationAuth(t, tc, l2DBTxSel, ChainID, hermezContractAddr, "B")
	_ = addAccCreationAuth(t, tc, l2DBTxSel, ChainID, hermezContractAddr, "C")
	addL2Txs(t, l2DBTxSel, l2Txs) // Add L2s to TxSelector.L2DB
	l1UserTxs := til.L1TxsToCommonL1Txs(tc.Queues[*blocks[0].Rollup.Batches[6].Batch.ForgeL1TxsNum])
	// TxSelector select the transactions for the next Batch
	coordIdxs, _, oL1UserTxs, oL1CoordTxs, oL2Txs, discardedL2Txs, err := txsel.GetL1L2TxSelection(selectionConfig, l1UserTxs)
	require.NoError(t, err)
	// BatchBuilder build Batch
	zki, err := bb.BuildBatch(coordIdxs, configBatch, oL1UserTxs, oL1CoordTxs, oL2Txs)
	require.NoError(t, err)
	assert.Equal(t, "7614010373759339299470010949167613050707822522530721724565424494781010548240", bb.LocalStateDB().MT.Root().BigInt().String())
	sendProofAndCheckResp(t, zki)
	err = l2DBTxSel.StartForging(common.TxIDsFromPoolL2Txs(oL2Txs), txsel.LocalAccountsDB().CurrentBatch())
	require.NoError(t, err)
	err = l2DBTxSel.UpdateTxsInfo(discardedL2Txs)
	require.NoError(t, err)

	log.Debug("block:0 batch:8")
	// simulate the PoolL2Txs of the batch8
	batchPoolL2 = `
	Type: PoolL2
	PoolTransfer(0) A-B: 100 (126)
	PoolTransfer(0) C-A: 50 (126)
	PoolTransfer(1) B-C: 100 (126)
	PoolExit(0) A: 100 (126)`
	l2Txs, err = tc.GeneratePoolL2Txs(batchPoolL2)
	require.NoError(t, err)
	addL2Txs(t, l2DBTxSel, l2Txs) // Add L2s to TxSelector.L2DB
	l1UserTxs = til.L1TxsToCommonL1Txs(tc.Queues[*blocks[0].Rollup.Batches[7].Batch.ForgeL1TxsNum])
	// TxSelector select the transactions for the next Batch
	coordIdxs, _, oL1UserTxs, oL1CoordTxs, oL2Txs, discardedL2Txs, err = txsel.GetL1L2TxSelection(selectionConfig, l1UserTxs)
	require.NoError(t, err)
	// BatchBuilder build Batch
	zki, err = bb.BuildBatch(coordIdxs, configBatch, oL1UserTxs, oL1CoordTxs, oL2Txs)
	require.NoError(t, err)
	assert.Equal(t, "21231789250434471575486264439945776732824482207853465397552873521865656677689", bb.LocalStateDB().MT.Root().BigInt().String())
	sendProofAndCheckResp(t, zki)
	err = l2DBTxSel.StartForging(common.TxIDsFromPoolL2Txs(l2Txs), txsel.LocalAccountsDB().CurrentBatch())
	require.NoError(t, err)
	err = l2DBTxSel.UpdateTxsInfo(discardedL2Txs)
	require.NoError(t, err)

	log.Debug("(batch9) block:1 batch:1")
	// simulate the PoolL2Txs of the batch9
	batchPoolL2 = `
	Type: PoolL2
	PoolTransfer(0) D-A: 300 (126)
	PoolTransfer(0) B-D: 100 (126)`
	l2Txs, err = tc.GeneratePoolL2Txs(batchPoolL2)
	require.NoError(t, err)
	addL2Txs(t, l2DBTxSel, l2Txs) // Add L2s to TxSelector.L2DB
	l1UserTxs = til.L1TxsToCommonL1Txs(tc.Queues[*blocks[1].Rollup.Batches[0].Batch.ForgeL1TxsNum])
	// TxSelector select the transactions for the next Batch
	coordIdxs, _, oL1UserTxs, oL1CoordTxs, oL2Txs, discardedL2Txs, err = txsel.GetL1L2TxSelection(selectionConfig, l1UserTxs)
	require.NoError(t, err)
	// BatchBuilder build Batch
	zki, err = bb.BuildBatch(coordIdxs, configBatch, oL1UserTxs, oL1CoordTxs, oL2Txs)
	require.NoError(t, err)
	assert.Equal(t, "11289313644810782435120113035387729451095637380468777086895109386127538554246", bb.LocalStateDB().MT.Root().BigInt().String())
	sendProofAndCheckResp(t, zki)
	err = l2DBTxSel.StartForging(common.TxIDsFromPoolL2Txs(l2Txs), txsel.LocalAccountsDB().CurrentBatch())
	require.NoError(t, err)
	err = l2DBTxSel.UpdateTxsInfo(discardedL2Txs)
	require.NoError(t, err)

	log.Debug("(batch10) block:1 batch:2")
	l2Txs = []common.PoolL2Tx{}
	l1UserTxs = til.L1TxsToCommonL1Txs(tc.Queues[*blocks[1].Rollup.Batches[1].Batch.ForgeL1TxsNum])
	// TxSelector select the transactions for the next Batch
	coordIdxs, _, oL1UserTxs, oL1CoordTxs, oL2Txs, discardedL2Txs, err = txsel.GetL1L2TxSelection(selectionConfig, l1UserTxs)
	require.NoError(t, err)
	// BatchBuilder build Batch
	zki, err = bb.BuildBatch(coordIdxs, configBatch, oL1UserTxs, oL1CoordTxs, oL2Txs)
	require.NoError(t, err)
	// same root as previous batch, as the L1CoordinatorTxs created by the
	// Til set is not created by the TxSelector in this test
	assert.Equal(t, "11289313644810782435120113035387729451095637380468777086895109386127538554246", bb.LocalStateDB().MT.Root().BigInt().String())
	sendProofAndCheckResp(t, zki)
	err = l2DBTxSel.StartForging(common.TxIDsFromPoolL2Txs(l2Txs), txsel.LocalAccountsDB().CurrentBatch())
	require.NoError(t, err)
	err = l2DBTxSel.UpdateTxsInfo(discardedL2Txs)
	require.NoError(t, err)
}

// TestZKInputsExitWithFee0 checks the case where there is a PoolTxs of type
// Exit with fee 0 for a TokenID that the Coordinator does not have it
// registered yet
func TestZKInputsExitWithFee0(t *testing.T) {
	tc := til.NewContext(ChainID, common.RollupConstMaxL1UserTx)

	var set = `
	Type: Blockchain
	AddToken(1)

	CreateAccountDeposit(1) A: 1000
	CreateAccountDeposit(1) B: 1000
	CreateAccountDeposit(1) C: 1000
	> batchL1
	> batchL1

	CreateAccountCoordinator(1) Coord
	> batch
	> block
	`
	blocks, err := tc.GenerateBlocks(set)
	require.NoError(t, err)

	hermezContractAddr := ethCommon.HexToAddress("0xc344E203a046Da13b0B4467EB7B3629D0C99F6E6")
	txsel, l2DBTxSel, syncStateDB := initTxSelector(t, ChainID, hermezContractAddr, tc.Users["Coord"])

	bbDir, err := ioutil.TempDir("", "tmpBatchBuilderDB")
	require.NoError(t, err)
	bb, err := batchbuilder.NewBatchBuilder(bbDir, syncStateDB, 0, NLevels)
	require.NoError(t, err)

	// restart nonces of TilContext, as will be set by generating directly
	// the PoolL2Txs for each specific batch with tc.GeneratePoolL2Txs
	tc.RestartNonces()
	// add tokens to HistoryDB to avoid breaking FK constrains
	addTokens(t, tc, l2DBTxSel.DB())

	selectionConfig := &txselector.SelectionConfig{
		MaxL1UserTxs:      100,
		TxProcessorConfig: txprocConfig,
	}
	configBatch := &batchbuilder.ConfigBatch{
		TxProcessorConfig: txprocConfig,
	}

	// batch2
	// TxSelector select the transactions for the next Batch
	l1UserTxs := til.L1TxsToCommonL1Txs(tc.Queues[*blocks[0].Rollup.Batches[1].Batch.ForgeL1TxsNum])
	coordIdxs, _, oL1UserTxs, oL1CoordTxs, oL2Txs, _, err := txsel.GetL1L2TxSelection(selectionConfig, l1UserTxs)
	require.NoError(t, err)
	// BatchBuilder build Batch
	zki, err := bb.BuildBatch(coordIdxs, configBatch, oL1UserTxs, oL1CoordTxs, oL2Txs)
	require.NoError(t, err)
	assert.Equal(t, "8737171572459172806192626402462788826264011087579491137542380589998149683116", bb.LocalStateDB().MT.Root().BigInt().String())
	h, err := zki.HashGlobalData()
	require.NoError(t, err)
	assert.Equal(t, "12174727174629825205577542675894290689387326670869871089988393208259924373499", h.String())
	sendProofAndCheckResp(t, zki)

	// batch3
	batchPoolL2 := `
	Type: PoolL2
	PoolExit(1) A: 100 (0)`
	l2Txs, err := tc.GeneratePoolL2Txs(batchPoolL2)
	require.NoError(t, err)
	addL2Txs(t, l2DBTxSel, l2Txs) // Add L2s to TxSelector.L2DB
	coordIdxs, _, oL1UserTxs, oL1CoordTxs, oL2Txs, discardedL2Txs, err := txsel.GetL1L2TxSelection(selectionConfig, nil)
	require.NoError(t, err)
	assert.Equal(t, 1, len(coordIdxs))
	assert.Equal(t, 0, len(oL1UserTxs))
	assert.Equal(t, 1, len(oL1CoordTxs))
	assert.Equal(t, 1, len(oL2Txs))
	assert.Equal(t, 0, len(discardedL2Txs))
	// BatchBuilder build Batch
	zki, err = bb.BuildBatch(coordIdxs, configBatch, oL1UserTxs, oL1CoordTxs, oL2Txs)
	require.NoError(t, err)
	assert.Equal(t, "18306761925365215381387147754881756804475668085493847010988306480531520370130", bb.LocalStateDB().MT.Root().BigInt().String())
	h, err = zki.HashGlobalData()
	require.NoError(t, err)
	assert.Equal(t, "16351950370739934361208977436603065280805499094788807090831605833717933916063", h.String())
	assert.Equal(t, common.EthAddrToBigInt(tc.Users["Coord"].Addr), zki.EthAddr3[0])
	assert.Equal(t, "0", zki.EthAddr3[1].String())
	sendProofAndCheckResp(t, zki)
}