package transactions

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

	eth "github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/rpc"
	"github.com/status-im/status-go/rpc/chain"
	"github.com/status-im/status-go/services/wallet/bigint"
	"github.com/status-im/status-go/services/wallet/common"

	"github.com/stretchr/testify/mock"
	"github.com/stretchr/testify/require"
)

type MockETHClient struct {
	mock.Mock
}

func (m *MockETHClient) BatchCallContext(ctx context.Context, b []rpc.BatchElem) error {
	args := m.Called(ctx, b)
	return args.Error(0)
}

type MockChainClient struct {
	mock.Mock

	Clients map[common.ChainID]*MockETHClient
}

func NewMockChainClient() *MockChainClient {
	return &MockChainClient{
		Clients: make(map[common.ChainID]*MockETHClient),
	}
}

func (m *MockChainClient) SetAvailableClients(chainIDs []common.ChainID) *MockChainClient {
	for _, chainID := range chainIDs {
		if _, ok := m.Clients[chainID]; !ok {
			m.Clients[chainID] = new(MockETHClient)
		}
	}
	return m
}

func (m *MockChainClient) AbstractEthClient(chainID common.ChainID) (chain.BatchCallClient, error) {
	if _, ok := m.Clients[chainID]; !ok {
		panic(fmt.Sprintf("no mock client for chainID %d", chainID))
	}
	return m.Clients[chainID], nil
}

func GenerateTestPendingTransactions(start int, count int) []PendingTransaction {
	if count > 127 {
		panic("can't generate more than 127 distinct transactions")
	}

	txs := make([]PendingTransaction, count)
	for i := start; i < count; i++ {
		txs[i] = PendingTransaction{
			Hash:           eth.HexToHash(fmt.Sprintf("0x1%d", i)),
			From:           eth.HexToAddress(fmt.Sprintf("0x2%d", i)),
			To:             eth.HexToAddress(fmt.Sprintf("0x3%d", i)),
			Type:           RegisterENS,
			AdditionalData: "someuser.stateofus.eth",
			Value:          bigint.BigInt{Int: big.NewInt(int64(i))},
			GasLimit:       bigint.BigInt{Int: big.NewInt(21000)},
			GasPrice:       bigint.BigInt{Int: big.NewInt(int64(i))},
			ChainID:        777,
			Status:         new(TxStatus),
			AutoDelete:     new(bool),
			Symbol:         "ETH",
			Timestamp:      uint64(i),
		}
		*txs[i].Status = Pending  // set to pending by default
		*txs[i].AutoDelete = true // set to true by default
	}
	return txs
}

type TestTxSummary struct {
	failStatus  bool
	DontConfirm bool
	// Timestamp will be used to mock the Timestamp if greater than 0
	Timestamp int
}

func MockTestTransactions(t *testing.T, chainClient *MockChainClient, testTxs []TestTxSummary) []PendingTransaction {
	txs := GenerateTestPendingTransactions(0, len(testTxs))

	for txIdx := range txs {
		tx := &txs[txIdx]
		if testTxs[txIdx].Timestamp > 0 {
			tx.Timestamp = uint64(testTxs[txIdx].Timestamp)
		}

		// Mock the first call to getTransactionByHash
		chainClient.SetAvailableClients([]common.ChainID{tx.ChainID})
		cl := chainClient.Clients[tx.ChainID]
		call := cl.On("BatchCallContext", mock.Anything, mock.MatchedBy(func(b []rpc.BatchElem) bool {
			ok := len(b) == len(testTxs)
			for i := range b {
				ok = ok && b[i].Method == GetTransactionReceiptRPCName && b[i].Args[0] == tx.Hash
			}
			return ok
		})).Return(nil)
		if testTxs[txIdx].DontConfirm {
			call = call.Times(0)
		} else {
			call = call.Once()
		}

		call.Run(func(args mock.Arguments) {
			elems := args.Get(1).([]rpc.BatchElem)
			for i := range elems {
				receiptWrapper, ok := elems[i].Result.(*nullableReceipt)
				require.True(t, ok)
				require.NotNil(t, receiptWrapper)
				// Simulate parsing of eth_getTransactionReceipt response
				if !testTxs[i].DontConfirm {
					status := types.ReceiptStatusSuccessful
					if testTxs[i].failStatus {
						status = types.ReceiptStatusFailed
					}

					receiptWrapper.Receipt = &types.Receipt{
						BlockNumber: new(big.Int).SetUint64(1),
						Status:      status,
					}
				}
			}
		})
	}
	return txs
}