package contract_test

import (
	"math"
	"math/big"
	"testing"

	"github.com/nspcc-dev/neo-go/pkg/core/interop/interopnames"
	"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/neotest"
	"github.com/nspcc-dev/neo-go/pkg/neotest/chain"
	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
	"github.com/nspcc-dev/neo-go/pkg/util"
	"github.com/nspcc-dev/neo-go/pkg/vm/emit"
	"github.com/stretchr/testify/require"
)

func TestCreateStandardAccount(t *testing.T) {
	bc, acc := chain.NewSingle(t)
	e := neotest.NewExecutor(t, bc, acc, acc)
	w := io.NewBufBinWriter()

	t.Run("Good", func(t *testing.T) {
		priv, err := keys.NewPrivateKey()
		require.NoError(t, err)
		pub := priv.PublicKey()

		emit.Bytes(w.BinWriter, pub.Bytes())
		emit.Syscall(w.BinWriter, interopnames.SystemContractCreateStandardAccount)
		require.NoError(t, w.Err)
		script := w.Bytes()

		tx := e.PrepareInvocation(t, script, []neotest.Signer{e.Validator}, bc.BlockHeight()+1)
		e.AddNewBlock(t, tx)
		e.CheckHalt(t, tx.Hash())

		res := e.GetTxExecResult(t, tx.Hash())
		value := res.Stack[0].Value().([]byte)
		u, err := util.Uint160DecodeBytesBE(value)
		require.NoError(t, err)
		require.Equal(t, pub.GetScriptHash(), u)
	})
	t.Run("InvalidKey", func(t *testing.T) {
		w.Reset()
		emit.Bytes(w.BinWriter, []byte{1, 2, 3})
		emit.Syscall(w.BinWriter, interopnames.SystemContractCreateStandardAccount)
		require.NoError(t, w.Err)
		script := w.Bytes()

		tx := e.PrepareInvocation(t, script, []neotest.Signer{e.Validator}, bc.BlockHeight()+1)
		e.AddNewBlock(t, tx)
		e.CheckFault(t, tx.Hash(), "invalid prefix 1")
	})
}

func TestCreateMultisigAccount(t *testing.T) {
	bc, acc := chain.NewSingle(t)
	e := neotest.NewExecutor(t, bc, acc, acc)
	w := io.NewBufBinWriter()

	createScript := func(t *testing.T, pubs []interface{}, m int) []byte {
		w.Reset()
		emit.Array(w.BinWriter, pubs...)
		emit.Int(w.BinWriter, int64(m))
		emit.Syscall(w.BinWriter, interopnames.SystemContractCreateMultisigAccount)
		require.NoError(t, w.Err)
		return w.Bytes()
	}
	t.Run("Good", func(t *testing.T) {
		m, n := 3, 5
		pubs := make(keys.PublicKeys, n)
		arr := make([]interface{}, n)
		for i := range pubs {
			pk, err := keys.NewPrivateKey()
			require.NoError(t, err)
			pubs[i] = pk.PublicKey()
			arr[i] = pubs[i].Bytes()
		}
		script := createScript(t, arr, m)

		txH := e.InvokeScript(t, script, []neotest.Signer{acc})
		e.CheckHalt(t, txH)
		res := e.GetTxExecResult(t, txH)
		value := res.Stack[0].Value().([]byte)
		u, err := util.Uint160DecodeBytesBE(value)
		require.NoError(t, err)
		expected, err := smartcontract.CreateMultiSigRedeemScript(m, pubs)
		require.NoError(t, err)
		require.Equal(t, hash.Hash160(expected), u)
	})
	t.Run("InvalidKey", func(t *testing.T) {
		script := createScript(t, []interface{}{[]byte{1, 2, 3}}, 1)
		e.InvokeScriptCheckFAULT(t, script, []neotest.Signer{acc}, "invalid prefix 1")
	})
	t.Run("Invalid m", func(t *testing.T) {
		pk, err := keys.NewPrivateKey()
		require.NoError(t, err)
		script := createScript(t, []interface{}{pk.PublicKey().Bytes()}, 2)
		e.InvokeScriptCheckFAULT(t, script, []neotest.Signer{acc}, "length of the signatures (2) is higher then the number of public keys")
	})
	t.Run("m overflows int32", func(t *testing.T) {
		pk, err := keys.NewPrivateKey()
		require.NoError(t, err)
		m := big.NewInt(math.MaxInt32)
		m.Add(m, big.NewInt(1))
		w.Reset()
		emit.Array(w.BinWriter, pk.Bytes())
		emit.BigInt(w.BinWriter, m)
		emit.Syscall(w.BinWriter, interopnames.SystemContractCreateMultisigAccount)
		require.NoError(t, w.Err)
		e.InvokeScriptCheckFAULT(t, w.Bytes(), []neotest.Signer{acc}, "m must be positive and fit int32")
	})
}