package server

import (
	"context"
	"encoding/base64"
	"testing"

	"github.com/nspcc-dev/neo-go/internal/testchain"
	"github.com/nspcc-dev/neo-go/pkg/config/netmode"
	"github.com/nspcc-dev/neo-go/pkg/core/fee"
	"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
	"github.com/nspcc-dev/neo-go/pkg/io"
	"github.com/nspcc-dev/neo-go/pkg/rpc/client"
	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
	"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
	"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
	"github.com/nspcc-dev/neo-go/pkg/util"
	"github.com/nspcc-dev/neo-go/pkg/vm"
	"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
	"github.com/nspcc-dev/neo-go/pkg/wallet"
	"github.com/stretchr/testify/require"
)

func TestClient_NEP17(t *testing.T) {
	chain, rpcSrv, httpSrv := initServerWithInMemoryChain(t)
	defer chain.Close()
	defer rpcSrv.Shutdown()

	c, err := client.New(context.Background(), httpSrv.URL, client.Options{})
	require.NoError(t, err)
	require.NoError(t, c.Init())

	h, err := util.Uint160DecodeStringLE(testContractHash)
	require.NoError(t, err)

	t.Run("Decimals", func(t *testing.T) {
		d, err := c.NEP17Decimals(h)
		require.NoError(t, err)
		require.EqualValues(t, 2, d)
	})
	t.Run("TotalSupply", func(t *testing.T) {
		s, err := c.NEP17TotalSupply(h)
		require.NoError(t, err)
		require.EqualValues(t, 1_000_000, s)
	})
	t.Run("Symbol", func(t *testing.T) {
		sym, err := c.NEP17Symbol(h)
		require.NoError(t, err)
		require.Equal(t, "RUB", sym)
	})
	t.Run("TokenInfo", func(t *testing.T) {
		tok, err := c.NEP17TokenInfo(h)
		require.NoError(t, err)
		require.Equal(t, h, tok.Hash)
		require.Equal(t, "Rubl", tok.Name)
		require.Equal(t, "RUB", tok.Symbol)
		require.EqualValues(t, 2, tok.Decimals)
	})
	t.Run("BalanceOf", func(t *testing.T) {
		acc := testchain.PrivateKeyByID(0).GetScriptHash()
		b, err := c.NEP17BalanceOf(h, acc)
		require.NoError(t, err)
		require.EqualValues(t, 877, b)
	})
}

func TestAddNetworkFee(t *testing.T) {
	chain, rpcSrv, httpSrv := initServerWithInMemoryChain(t)
	defer chain.Close()
	defer rpcSrv.Shutdown()
	const extraFee = 10

	c, err := client.New(context.Background(), httpSrv.URL, client.Options{})
	require.NoError(t, err)
	require.NoError(t, c.Init())

	getAccounts := func(t *testing.T, n int) []*wallet.Account {
		accs := make([]*wallet.Account, n)
		var err error
		for i := range accs {
			accs[i], err = wallet.NewAccount()
			require.NoError(t, err)
		}
		return accs
	}

	feePerByte := chain.FeePerByte()

	t.Run("Invalid", func(t *testing.T) {
		tx := transaction.New(testchain.Network(), []byte{byte(opcode.PUSH1)}, 0)
		accs := getAccounts(t, 2)
		tx.Signers = []transaction.Signer{{
			Account: accs[0].PrivateKey().GetScriptHash(),
			Scopes:  transaction.CalledByEntry,
		}}
		require.Error(t, c.AddNetworkFee(tx, extraFee, accs[0], accs[1]))
	})
	t.Run("Simple", func(t *testing.T) {
		tx := transaction.New(testchain.Network(), []byte{byte(opcode.PUSH1)}, 0)
		accs := getAccounts(t, 1)
		tx.Signers = []transaction.Signer{{
			Account: accs[0].PrivateKey().GetScriptHash(),
			Scopes:  transaction.CalledByEntry,
		}}
		require.NoError(t, c.AddNetworkFee(tx, 10, accs[0]))
		require.NoError(t, accs[0].SignTx(tx))
		cFee, _ := fee.Calculate(chain.GetBaseExecFee(), accs[0].Contract.Script)
		require.Equal(t, int64(io.GetVarSize(tx))*feePerByte+cFee+extraFee, tx.NetworkFee)
	})

	t.Run("Multi", func(t *testing.T) {
		tx := transaction.New(testchain.Network(), []byte{byte(opcode.PUSH1)}, 0)
		accs := getAccounts(t, 4)
		pubs := keys.PublicKeys{accs[1].PrivateKey().PublicKey(), accs[2].PrivateKey().PublicKey(), accs[3].PrivateKey().PublicKey()}
		require.NoError(t, accs[1].ConvertMultisig(2, pubs))
		require.NoError(t, accs[2].ConvertMultisig(2, pubs))
		tx.Signers = []transaction.Signer{
			{
				Account: accs[0].PrivateKey().GetScriptHash(),
				Scopes:  transaction.CalledByEntry,
			},
			{
				Account: hash.Hash160(accs[1].Contract.Script),
				Scopes:  transaction.Global,
			},
		}
		require.NoError(t, c.AddNetworkFee(tx, extraFee, accs[0], accs[1]))
		require.NoError(t, accs[0].SignTx(tx))
		require.NoError(t, accs[1].SignTx(tx))
		require.NoError(t, accs[2].SignTx(tx))
		cFee, _ := fee.Calculate(chain.GetBaseExecFee(), accs[0].Contract.Script)
		cFeeM, _ := fee.Calculate(chain.GetBaseExecFee(), accs[1].Contract.Script)
		require.Equal(t, int64(io.GetVarSize(tx))*feePerByte+cFee+cFeeM+extraFee, tx.NetworkFee)
	})
	t.Run("Contract", func(t *testing.T) {
		h, err := util.Uint160DecodeStringLE(verifyContractHash)
		require.NoError(t, err)
		priv := testchain.PrivateKeyByID(0)
		acc0 := wallet.NewAccountFromPrivateKey(priv)
		acc1 := wallet.NewAccountFromPrivateKey(priv) // contract account
		acc1.Contract.Deployed = true
		acc1.Contract.Script, err = base64.StdEncoding.DecodeString(verifyContractAVM)

		newTx := func(t *testing.T) *transaction.Transaction {
			tx := transaction.New(testchain.Network(), []byte{byte(opcode.PUSH1)}, 0)
			require.NoError(t, err)
			tx.ValidUntilBlock = chain.BlockHeight() + 10
			return tx
		}

		t.Run("Valid", func(t *testing.T) {
			completeTx := func(t *testing.T) *transaction.Transaction {
				tx := newTx(t)
				tx.Signers = []transaction.Signer{
					{
						Account: acc0.PrivateKey().GetScriptHash(),
						Scopes:  transaction.CalledByEntry,
					},
					{
						Account: h,
						Scopes:  transaction.Global,
					},
				}
				require.NoError(t, c.AddNetworkFee(tx, extraFee, acc0, acc1))
				return tx
			}

			// check that network fee with extra value is enough
			tx1 := completeTx(t)
			require.NoError(t, acc0.SignTx(tx1))
			tx1.Scripts = append(tx1.Scripts, transaction.Witness{})
			require.NoError(t, chain.VerifyTx(tx1))

			// check that network fee without extra value is enough
			tx2 := completeTx(t)
			tx2.NetworkFee -= extraFee
			require.NoError(t, acc0.SignTx(tx2))
			tx2.Scripts = append(tx2.Scripts, transaction.Witness{})
			require.NoError(t, chain.VerifyTx(tx2))

			// check that we don't add unexpected extra GAS
			tx3 := completeTx(t)
			tx3.NetworkFee -= extraFee + 1
			require.NoError(t, acc0.SignTx(tx3))
			tx3.Scripts = append(tx3.Scripts, transaction.Witness{})
			require.Error(t, chain.VerifyTx(tx3))
		})
		t.Run("Invalid", func(t *testing.T) {
			tx := newTx(t)
			acc0, err := wallet.NewAccount()
			require.NoError(t, err)
			tx.Signers = []transaction.Signer{
				{
					Account: acc0.PrivateKey().GetScriptHash(),
					Scopes:  transaction.CalledByEntry,
				},
				{
					Account: h,
					Scopes:  transaction.Global,
				},
			}
			require.Error(t, c.AddNetworkFee(tx, 10, acc0, acc1))
		})
		t.Run("InvalidContract", func(t *testing.T) {
			tx := newTx(t)
			acc0 := wallet.NewAccountFromPrivateKey(priv)
			tx.Signers = []transaction.Signer{
				{
					Account: acc0.PrivateKey().GetScriptHash(),
					Scopes:  transaction.CalledByEntry,
				},
				{
					Account: util.Uint160{},
					Scopes:  transaction.Global,
				},
			}
			require.Error(t, c.AddNetworkFee(tx, 10, acc0, acc1))
		})
	})
}

func TestSignAndPushInvocationTx(t *testing.T) {
	chain, rpcSrv, httpSrv := initServerWithInMemoryChain(t)
	defer chain.Close()
	defer rpcSrv.Shutdown()

	c, err := client.New(context.Background(), httpSrv.URL, client.Options{})
	require.NoError(t, err)
	require.NoError(t, c.Init())

	priv := testchain.PrivateKey(0)
	acc := wallet.NewAccountFromPrivateKey(priv)
	h, err := c.SignAndPushInvocationTx([]byte{byte(opcode.PUSH1)}, acc, 30, 0, []client.SignerAccount{
		{
			Signer: transaction.Signer{
				Account: priv.GetScriptHash(),
				Scopes:  transaction.CalledByEntry,
			},
			Account: acc,
		},
	})
	require.NoError(t, err)

	mp := chain.GetMemPool()
	tx, ok := mp.TryGetValue(h)
	require.True(t, ok)
	require.Equal(t, h, tx.Hash())
	require.EqualValues(t, 30, tx.SystemFee)
}

func TestSignAndPushP2PNotaryRequest(t *testing.T) {
	chain, rpcSrv, httpSrv := initServerWithInMemoryChainAndServices(t, false, true)
	defer chain.Close()
	defer rpcSrv.Shutdown()

	c, err := client.New(context.Background(), httpSrv.URL, client.Options{})
	require.NoError(t, err)

	t.Run("client wasn't initialized", func(t *testing.T) {
		_, err := c.SignAndPushP2PNotaryRequest(nil, nil, 0, 0, 0, nil)
		require.NotNil(t, err)
	})

	require.NoError(t, c.Init())
	t.Run("bad account address", func(t *testing.T) {
		_, err := c.SignAndPushP2PNotaryRequest(nil, nil, 0, 0, 0, &wallet.Account{Address: "not-an-addr"})
		require.NotNil(t, err)
	})

	acc, err := wallet.NewAccount()
	require.NoError(t, err)
	t.Run("bad fallback script", func(t *testing.T) {
		_, err := c.SignAndPushP2PNotaryRequest(nil, []byte{byte(opcode.ASSERT)}, -1, 0, 0, acc)
		require.NotNil(t, err)
	})

	t.Run("too large fallbackValidFor", func(t *testing.T) {
		_, err := c.SignAndPushP2PNotaryRequest(nil, []byte{byte(opcode.RET)}, -1, 0, 141, acc)
		require.NotNil(t, err)
	})

	t.Run("good", func(t *testing.T) {
		sender := testchain.PrivateKeyByID(0) // owner of the deposit in testchain
		acc := wallet.NewAccountFromPrivateKey(sender)
		expected := transaction.Transaction{
			Network:         netmode.UnitTestNet,
			Attributes:      []transaction.Attribute{{Type: transaction.NotaryAssistedT, Value: &transaction.NotaryAssisted{NKeys: 1}}},
			Script:          []byte{byte(opcode.RET)},
			ValidUntilBlock: chain.BlockHeight() + 5,
			Signers:         []transaction.Signer{{Account: util.Uint160{1, 5, 9}}},
			Scripts: []transaction.Witness{{
				InvocationScript:   []byte{1, 4, 7},
				VerificationScript: []byte{3, 6, 9},
			}},
		}
		mainTx := expected
		_ = expected.Hash()
		req, err := c.SignAndPushP2PNotaryRequest(&mainTx, []byte{byte(opcode.RET)}, -1, 0, 6, acc)
		require.NoError(t, err)

		// check that request was correctly completed
		require.Equal(t, expected, *req.MainTransaction) // main tx should be the same
		require.ElementsMatch(t, []transaction.Attribute{
			{
				Type:  transaction.NotaryAssistedT,
				Value: &transaction.NotaryAssisted{NKeys: 0},
			},
			{
				Type:  transaction.NotValidBeforeT,
				Value: &transaction.NotValidBefore{Height: chain.BlockHeight()},
			},
			{
				Type:  transaction.ConflictsT,
				Value: &transaction.Conflicts{Hash: mainTx.Hash()},
			},
		}, req.FallbackTransaction.Attributes)
		require.Equal(t, []transaction.Signer{
			{Account: chain.GetNotaryContractScriptHash()},
			{Account: acc.PrivateKey().GetScriptHash()},
		}, req.FallbackTransaction.Signers)

		// it shouldn't be an error to add completed fallback to the chain
		w, err := wallet.NewWalletFromFile(notaryPath)
		require.NoError(t, err)
		ntr := w.Accounts[0]
		ntr.Decrypt(notaryPass)
		req.FallbackTransaction.Scripts[0] = transaction.Witness{
			InvocationScript:   append([]byte{byte(opcode.PUSHDATA1), 64}, ntr.PrivateKey().Sign(req.FallbackTransaction.GetSignedPart())...),
			VerificationScript: []byte{},
		}
		b := testchain.NewBlock(t, chain, 1, 0, req.FallbackTransaction)
		require.NoError(t, chain.AddBlock(b))
		appLogs, err := chain.GetAppExecResults(req.FallbackTransaction.Hash(), trigger.Application)
		require.NoError(t, err)
		require.Equal(t, 1, len(appLogs))
		appLog := appLogs[0]
		require.Equal(t, vm.HaltState, appLog.VMState)
		require.Equal(t, appLog.GasConsumed, req.FallbackTransaction.SystemFee)
	})
}

func TestCalculateNotaryFee(t *testing.T) {
	chain, rpcSrv, httpSrv := initServerWithInMemoryChain(t)
	defer chain.Close()
	defer rpcSrv.Shutdown()

	c, err := client.New(context.Background(), httpSrv.URL, client.Options{})
	require.NoError(t, err)

	t.Run("client not initialized", func(t *testing.T) {
		_, err := c.CalculateNotaryFee(0)
		require.NotNil(t, err)
	})
}

func TestPing(t *testing.T) {
	chain, rpcSrv, httpSrv := initServerWithInMemoryChain(t)
	defer chain.Close()

	c, err := client.New(context.Background(), httpSrv.URL, client.Options{})
	require.NoError(t, err)
	require.NoError(t, c.Init())

	require.NoError(t, c.Ping())
	require.NoError(t, rpcSrv.Shutdown())
	httpSrv.Close()
	require.Error(t, c.Ping())
}

func TestCreateTxFromScript(t *testing.T) {
	chain, rpcSrv, httpSrv := initServerWithInMemoryChain(t)
	defer chain.Close()
	defer rpcSrv.Shutdown()

	c, err := client.New(context.Background(), httpSrv.URL, client.Options{})
	require.NoError(t, err)
	require.NoError(t, c.Init())

	priv := testchain.PrivateKey(0)
	acc := wallet.NewAccountFromPrivateKey(priv)
	t.Run("NoSystemFee", func(t *testing.T) {
		tx, err := c.CreateTxFromScript([]byte{byte(opcode.PUSH1)}, acc, -1, 10, nil)
		require.NoError(t, err)
		require.True(t, tx.ValidUntilBlock > chain.BlockHeight())
		require.EqualValues(t, 30, tx.SystemFee) // PUSH1
		require.True(t, len(tx.Signers) == 1)
		require.Equal(t, acc.PrivateKey().GetScriptHash(), tx.Signers[0].Account)
	})
	t.Run("ProvideSystemFee", func(t *testing.T) {
		tx, err := c.CreateTxFromScript([]byte{byte(opcode.PUSH1)}, acc, 123, 10, nil)
		require.NoError(t, err)
		require.True(t, tx.ValidUntilBlock > chain.BlockHeight())
		require.EqualValues(t, 123, tx.SystemFee)
		require.True(t, len(tx.Signers) == 1)
		require.Equal(t, acc.PrivateKey().GetScriptHash(), tx.Signers[0].Account)
	})
}

func TestCreateNEP17TransferTx(t *testing.T) {
	chain, rpcSrv, httpSrv := initServerWithInMemoryChain(t)
	defer chain.Close()
	defer rpcSrv.Shutdown()

	c, err := client.New(context.Background(), httpSrv.URL, client.Options{})
	require.NoError(t, err)
	require.NoError(t, c.Init())

	priv := testchain.PrivateKeyByID(0)
	acc := wallet.NewAccountFromPrivateKey(priv)

	gasContractHash, err := c.GetNativeContractHash(nativenames.Gas)
	require.NoError(t, err)

	tx, err := c.CreateNEP17TransferTx(acc, util.Uint160{}, gasContractHash, 1000, 0, nil)
	require.NoError(t, err)
	require.NoError(t, acc.SignTx(tx))
	require.NoError(t, chain.VerifyTx(tx))
	v := chain.GetTestVM(trigger.Application, tx, nil)
	v.LoadScriptWithFlags(tx.Script, callflag.All)
	require.NoError(t, v.Run())
}

func TestInvokeVerify(t *testing.T) {
	chain, rpcSrv, httpSrv := initServerWithInMemoryChain(t)
	defer chain.Close()
	defer rpcSrv.Shutdown()

	c, err := client.New(context.Background(), httpSrv.URL, client.Options{})
	require.NoError(t, err)
	require.NoError(t, c.Init())

	contract, err := util.Uint160DecodeStringLE(verifyContractHash)
	require.NoError(t, err)

	t.Run("positive, with signer", func(t *testing.T) {
		res, err := c.InvokeContractVerify(contract, smartcontract.Params{}, []transaction.Signer{{Account: testchain.PrivateKeyByID(0).PublicKey().GetScriptHash()}})
		require.NoError(t, err)
		require.Equal(t, "HALT", res.State)
		require.Equal(t, 1, len(res.Stack))
		require.True(t, res.Stack[0].Value().(bool))
	})

	t.Run("positive, with signer and witness", func(t *testing.T) {
		res, err := c.InvokeContractVerify(contract, smartcontract.Params{}, []transaction.Signer{{Account: testchain.PrivateKeyByID(0).PublicKey().GetScriptHash()}}, transaction.Witness{InvocationScript: []byte{byte(opcode.PUSH1), byte(opcode.RET)}})
		require.NoError(t, err)
		require.Equal(t, "HALT", res.State)
		require.Equal(t, 1, len(res.Stack))
		require.True(t, res.Stack[0].Value().(bool))
	})

	t.Run("error, invalid witness number", func(t *testing.T) {
		_, err := c.InvokeContractVerify(contract, smartcontract.Params{}, []transaction.Signer{{Account: testchain.PrivateKeyByID(0).PublicKey().GetScriptHash()}}, transaction.Witness{InvocationScript: []byte{byte(opcode.PUSH1), byte(opcode.RET)}}, transaction.Witness{InvocationScript: []byte{byte(opcode.RET)}})
		require.Error(t, err)
	})

	t.Run("false", func(t *testing.T) {
		res, err := c.InvokeContractVerify(contract, smartcontract.Params{}, []transaction.Signer{{Account: util.Uint160{}}})
		require.NoError(t, err)
		require.Equal(t, "HALT", res.State)
		require.Equal(t, 1, len(res.Stack))
		require.False(t, res.Stack[0].Value().(bool))
	})
}

func TestClient_GetNativeContracts(t *testing.T) {
	chain, rpcSrv, httpSrv := initServerWithInMemoryChain(t)
	defer chain.Close()
	defer rpcSrv.Shutdown()

	c, err := client.New(context.Background(), httpSrv.URL, client.Options{})
	require.NoError(t, err)
	require.NoError(t, c.Init())

	cs, err := c.GetNativeContracts()
	require.NoError(t, err)
	require.Equal(t, chain.GetNatives(), cs)
}