package commands

import (
	"context"
	"fmt"
	"math/big"
	"testing"
	"time"

	"github.com/holiman/uint256"
	"github.com/stretchr/testify/assert"

	"github.com/ledgerwatch/erigon-lib/gointerfaces/txpool"
	"github.com/ledgerwatch/erigon-lib/kv"
	"github.com/ledgerwatch/erigon-lib/kv/kvcache"
	"github.com/ledgerwatch/erigon/cmd/rpcdaemon/rpcdaemontest"
	"github.com/ledgerwatch/erigon/common"
	"github.com/ledgerwatch/erigon/common/hexutil"
	"github.com/ledgerwatch/erigon/common/math"
	"github.com/ledgerwatch/erigon/core"
	"github.com/ledgerwatch/erigon/core/rawdb"
	"github.com/ledgerwatch/erigon/core/state"
	"github.com/ledgerwatch/erigon/core/types"
	"github.com/ledgerwatch/erigon/crypto"
	"github.com/ledgerwatch/erigon/eth/stagedsync"
	"github.com/ledgerwatch/erigon/internal/ethapi"
	"github.com/ledgerwatch/erigon/params"
	"github.com/ledgerwatch/erigon/rpc"
	"github.com/ledgerwatch/erigon/turbo/rpchelper"
	"github.com/ledgerwatch/erigon/turbo/snapshotsync"
	"github.com/ledgerwatch/erigon/turbo/stages"
)

func TestEstimateGas(t *testing.T) {
	db := rpcdaemontest.CreateTestKV(t)
	stateCache := kvcache.New(kvcache.DefaultCoherentConfig)
	ctx, conn := rpcdaemontest.CreateTestGrpcConn(t, stages.Mock(t))
	mining := txpool.NewMiningClient(conn)
	ff := rpchelper.New(ctx, nil, nil, mining, func() {})
	api := NewEthAPI(NewBaseApi(ff, stateCache, snapshotsync.NewBlockReader(), false), db, nil, nil, nil, 5000000)
	var from = common.HexToAddress("0x71562b71999873db5b286df957af199ec94617f7")
	var to = common.HexToAddress("0x0d3ab14bbad3d99f4203bd7a11acb94882050e7e")
	if _, err := api.EstimateGas(context.Background(), &ethapi.CallArgs{
		From: &from,
		To:   &to,
	}, nil); err != nil {
		t.Errorf("calling EstimateGas: %v", err)
	}
}

func TestEthCallNonCanonical(t *testing.T) {
	db := rpcdaemontest.CreateTestKV(t)
	stateCache := kvcache.New(kvcache.DefaultCoherentConfig)
	api := NewEthAPI(NewBaseApi(nil, stateCache, snapshotsync.NewBlockReader(), false), db, nil, nil, nil, 5000000)
	var from = common.HexToAddress("0x71562b71999873db5b286df957af199ec94617f7")
	var to = common.HexToAddress("0x0d3ab14bbad3d99f4203bd7a11acb94882050e7e")
	if _, err := api.Call(context.Background(), ethapi.CallArgs{
		From: &from,
		To:   &to,
	}, rpc.BlockNumberOrHashWithHash(common.HexToHash("0x3fcb7c0d4569fddc89cbea54b42f163e0c789351d98810a513895ab44b47020b"), true), nil); err != nil {
		if fmt.Sprintf("%v", err) != "hash 3fcb7c0d4569fddc89cbea54b42f163e0c789351d98810a513895ab44b47020b is not currently canonical" {
			t.Errorf("wrong error: %v", err)
		}
	}
}

func TestEthCallToPrunedBlock(t *testing.T) {
	pruneTo := uint64(3)
	ethCallBlockNumber := rpc.BlockNumber(2)

	db, bankAddress, contractAddress := chainWithDeployedContract(t)

	prune(t, db, pruneTo)

	stateCache := kvcache.New(kvcache.DefaultCoherentConfig)
	api := NewEthAPI(NewBaseApi(nil, stateCache, snapshotsync.NewBlockReader(), false), db, nil, nil, nil, 5000000)

	callData := hexutil.MustDecode("0x2e64cec1")
	callDataBytes := hexutil.Bytes(callData)

	if _, err := api.Call(context.Background(), ethapi.CallArgs{
		From: &bankAddress,
		To:   &contractAddress,
		Data: &callDataBytes,
	}, rpc.BlockNumberOrHashWithNumber(ethCallBlockNumber), nil); err != nil {
		t.Errorf("unexpected error: %v", err)
	}
}

func TestGetBlockByTimestampLatestTime(t *testing.T) {
	ctx := context.Background()
	db := rpcdaemontest.CreateTestKV(t)

	tx, err := db.BeginRo(ctx)
	if err != nil {
		t.Errorf("fail at beginning tx")
	}
	defer tx.Rollback()

	stateCache := kvcache.New(kvcache.DefaultCoherentConfig)
	api := NewErigonAPI(NewBaseApi(nil, stateCache, snapshotsync.NewBlockReader(), false), db, nil)

	latestBlock := rawdb.ReadCurrentBlock(tx)
	response, err := ethapi.RPCMarshalBlock(latestBlock, true, false)

	if err != nil {
		t.Error("couldn't get the rpc marshal block")
	}

	if err == nil && rpc.BlockNumber(latestBlock.NumberU64()) == rpc.PendingBlockNumber {
		// Pending blocks need to nil out a few fields
		for _, field := range []string{"hash", "nonce", "miner"} {
			response[field] = nil
		}
	}

	block, err := api.GetBlockByTimestamp(ctx, rpc.Timestamp(latestBlock.Header().Time), false)
	if err != nil {
		t.Errorf("couldn't retrieve block %v", err)
	}

	if block["timestamp"] != response["timestamp"] || block["hash"] != response["hash"] {
		t.Errorf("Retrieved the wrong block.\nexpected block hash: %s expected timestamp: %d\nblock hash retrieved: %s timestamp retrieved: %d", response["hash"], response["timestamp"], block["hash"], block["timestamp"])
	}
}

func TestGetBlockByTimestampOldestTime(t *testing.T) {
	ctx := context.Background()
	db := rpcdaemontest.CreateTestKV(t)

	tx, err := db.BeginRo(ctx)
	if err != nil {
		t.Errorf("failed at beginning tx")
	}
	defer tx.Rollback()

	stateCache := kvcache.New(kvcache.DefaultCoherentConfig)
	api := NewErigonAPI(NewBaseApi(nil, stateCache, snapshotsync.NewBlockReader(), false), db, nil)

	oldestBlock, err := rawdb.ReadBlockByNumber(tx, 0)
	if err != nil {
		t.Error("couldn't retrieve oldest block")
	}

	response, err := ethapi.RPCMarshalBlock(oldestBlock, true, false)

	if err != nil {
		t.Error("couldn't get the rpc marshal block")
	}

	if err == nil && rpc.BlockNumber(oldestBlock.NumberU64()) == rpc.PendingBlockNumber {
		// Pending blocks need to nil out a few fields
		for _, field := range []string{"hash", "nonce", "miner"} {
			response[field] = nil
		}
	}

	block, err := api.GetBlockByTimestamp(ctx, rpc.Timestamp(oldestBlock.Header().Time), false)
	if err != nil {
		t.Errorf("couldn't retrieve block %v", err)
	}

	if block["timestamp"] != response["timestamp"] || block["hash"] != response["hash"] {
		t.Errorf("Retrieved the wrong block.\nexpected block hash: %s expected timestamp: %d\nblock hash retrieved: %s timestamp retrieved: %d", response["hash"], response["timestamp"], block["hash"], block["timestamp"])
	}
}

func TestGetBlockByTimeHigherThanLatestBlock(t *testing.T) {
	ctx := context.Background()
	db := rpcdaemontest.CreateTestKV(t)

	tx, err := db.BeginRo(ctx)
	if err != nil {
		t.Errorf("fail at beginning tx")
	}
	defer tx.Rollback()

	stateCache := kvcache.New(kvcache.DefaultCoherentConfig)
	api := NewErigonAPI(NewBaseApi(nil, stateCache, snapshotsync.NewBlockReader(), false), db, nil)

	latestBlock := rawdb.ReadCurrentBlock(tx)

	response, err := ethapi.RPCMarshalBlock(latestBlock, true, false)

	if err != nil {
		t.Error("couldn't get the rpc marshal block")
	}

	if err == nil && rpc.BlockNumber(latestBlock.NumberU64()) == rpc.PendingBlockNumber {
		// Pending blocks need to nil out a few fields
		for _, field := range []string{"hash", "nonce", "miner"} {
			response[field] = nil
		}
	}

	block, err := api.GetBlockByTimestamp(ctx, rpc.Timestamp(latestBlock.Header().Time+999999999999), false)
	if err != nil {
		t.Errorf("couldn't retrieve block %v", err)
	}

	if block["timestamp"] != response["timestamp"] || block["hash"] != response["hash"] {
		t.Errorf("Retrieved the wrong block.\nexpected block hash: %s expected timestamp: %d\nblock hash retrieved: %s timestamp retrieved: %d", response["hash"], response["timestamp"], block["hash"], block["timestamp"])
	}
}

func TestGetBlockByTimeMiddle(t *testing.T) {
	ctx := context.Background()
	db := rpcdaemontest.CreateTestKV(t)

	tx, err := db.BeginRo(ctx)
	if err != nil {
		t.Errorf("fail at beginning tx")
	}
	defer tx.Rollback()

	stateCache := kvcache.New(kvcache.DefaultCoherentConfig)
	api := NewErigonAPI(NewBaseApi(nil, stateCache, snapshotsync.NewBlockReader(), false), db, nil)

	currentHeader := rawdb.ReadCurrentHeader(tx)
	oldestHeader, err := api._blockReader.HeaderByNumber(ctx, tx, 0)
	if err != nil {
		t.Errorf("error getting oldest header %s", err)
	}
	if oldestHeader == nil {
		t.Error("couldn't find oldest header")
	}

	middleNumber := (currentHeader.Number.Uint64() + oldestHeader.Number.Uint64()) / 2
	middleBlock, err := rawdb.ReadBlockByNumber(tx, middleNumber)
	if err != nil {
		t.Error("couldn't retrieve middle block")
	}

	response, err := ethapi.RPCMarshalBlock(middleBlock, true, false)

	if err != nil {
		t.Error("couldn't get the rpc marshal block")
	}

	if err == nil && rpc.BlockNumber(middleBlock.NumberU64()) == rpc.PendingBlockNumber {
		// Pending blocks need to nil out a few fields
		for _, field := range []string{"hash", "nonce", "miner"} {
			response[field] = nil
		}
	}

	block, err := api.GetBlockByTimestamp(ctx, rpc.Timestamp(middleBlock.Header().Time), false)
	if err != nil {
		t.Errorf("couldn't retrieve block %v", err)
	}

	if block["timestamp"] != response["timestamp"] || block["hash"] != response["hash"] {
		t.Errorf("Retrieved the wrong block.\nexpected block hash: %s expected timestamp: %d\nblock hash retrieved: %s timestamp retrieved: %d", response["hash"], response["timestamp"], block["hash"], block["timestamp"])
	}
}

func TestGetBlockByTimestamp(t *testing.T) {
	ctx := context.Background()
	db := rpcdaemontest.CreateTestKV(t)

	tx, err := db.BeginRo(ctx)
	if err != nil {
		t.Errorf("fail at beginning tx")
	}
	defer tx.Rollback()

	stateCache := kvcache.New(kvcache.DefaultCoherentConfig)
	api := NewErigonAPI(NewBaseApi(nil, stateCache, snapshotsync.NewBlockReader(), false), db, nil)

	highestBlockNumber := rawdb.ReadCurrentHeader(tx).Number
	pickedBlock, err := rawdb.ReadBlockByNumber(tx, highestBlockNumber.Uint64()/3)
	if err != nil {
		t.Errorf("couldn't get block %v", pickedBlock.Number())
	}

	if pickedBlock == nil {
		t.Error("couldn't retrieve picked block")
	}
	response, err := ethapi.RPCMarshalBlock(pickedBlock, true, false)

	if err != nil {
		t.Error("couldn't get the rpc marshal block")
	}

	if err == nil && rpc.BlockNumber(pickedBlock.NumberU64()) == rpc.PendingBlockNumber {
		// Pending blocks need to nil out a few fields
		for _, field := range []string{"hash", "nonce", "miner"} {
			response[field] = nil
		}
	}

	block, err := api.GetBlockByTimestamp(ctx, rpc.Timestamp(pickedBlock.Header().Time), false)
	if err != nil {
		t.Errorf("couldn't retrieve block %v", err)
	}

	if block["timestamp"] != response["timestamp"] || block["hash"] != response["hash"] {
		t.Errorf("Retrieved the wrong block.\nexpected block hash: %s expected timestamp: %d\nblock hash retrieved: %s timestamp retrieved: %d", response["hash"], response["timestamp"], block["hash"], block["timestamp"])
	}
}

func chainWithDeployedContract(t *testing.T) (kv.RwDB, common.Address, common.Address) {
	var (
		signer      = types.LatestSignerForChainID(nil)
		bankKey, _  = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
		bankAddress = crypto.PubkeyToAddress(bankKey.PublicKey)
		bankFunds   = big.NewInt(1e9)
		contract    = hexutil.MustDecode("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")
		gspec       = &core.Genesis{
			Config: params.AllEthashProtocolChanges,
			Alloc:  core.GenesisAlloc{bankAddress: {Balance: bankFunds}},
		}
	)
	m := stages.MockWithGenesis(t, gspec, bankKey)
	db := m.DB

	var contractAddr common.Address

	chain, err := core.GenerateChain(m.ChainConfig, m.Genesis, m.Engine, m.DB, 2, func(i int, block *core.BlockGen) {
		nonce := block.TxNonce(bankAddress)
		switch i {
		case 0:
			tx, err := types.SignTx(types.NewContractCreation(nonce, new(uint256.Int), 1e6, new(uint256.Int), contract), *signer, bankKey)
			assert.NoError(t, err)
			block.AddTx(tx)
			contractAddr = crypto.CreateAddress(bankAddress, nonce)
		case 1:
			txn, err := types.SignTx(types.NewTransaction(nonce, contractAddr, new(uint256.Int), 90000, new(uint256.Int), nil), *signer, bankKey)
			assert.NoError(t, err)
			block.AddTx(txn)
		}
	}, false /* intermediateHashes */)
	if err != nil {
		t.Fatalf("generate blocks: %v", err)
	}

	err = m.InsertChain(chain)
	assert.NoError(t, err)

	tx, err := db.BeginRo(context.Background())
	if err != nil {
		t.Fatalf("read only db tx to read state: %v", err)
	}
	defer tx.Rollback()

	st := state.New(state.NewPlainState(tx, 1))
	assert.NoError(t, err)
	assert.False(t, st.Exist(contractAddr), "Contract should not exist at block #1")

	st = state.New(state.NewPlainState(tx, 2))
	assert.NoError(t, err)
	assert.True(t, st.Exist(contractAddr), "Contract should exist at block #2")

	return db, bankAddress, contractAddr
}

func prune(t *testing.T, db kv.RwDB, pruneTo uint64) {
	ctx := context.Background()
	tx, err := db.BeginRw(ctx)
	assert.NoError(t, err)

	logEvery := time.NewTicker(20 * time.Second)

	err = stagedsync.PruneTableDupSort(tx, kv.AccountChangeSet, "", pruneTo, logEvery, ctx)
	assert.NoError(t, err)

	err = stagedsync.PruneTableDupSort(tx, kv.StorageChangeSet, "", pruneTo, logEvery, ctx)
	assert.NoError(t, err)

	err = stagedsync.PruneTable(tx, kv.Receipts, pruneTo, ctx, math.MaxInt32)
	assert.NoError(t, err)

	err = stagedsync.PruneTable(tx, kv.Log, pruneTo, ctx, math.MaxInt32)
	assert.NoError(t, err)

	err = stagedsync.PruneTableDupSort(tx, kv.CallTraceSet, "", pruneTo, logEvery, ctx)
	assert.NoError(t, err)

	err = tx.Commit()
	assert.NoError(t, err)
}