package integration

import (
	"context"
	"testing"
	"time"

	"github.com/ethereum/go-ethereum/accounts/abi/bind"
	"github.com/ethereum/go-ethereum/crypto"
	"github.com/ethereum/go-ethereum/ethclient"
	"github.com/stretchr/testify/require"
	// NOTE: The following imports will be needed once the commented test code is uncommented:
	// "math/big"
	// "github.com/ethereum/go-ethereum/common"
	// "github.com/yourusername/mev-beta/bindings/contracts"
	// "github.com/yourusername/mev-beta/bindings/interfaces"
)

const (
	// Arbitrum Mainnet RPC for forking
	ArbitrumRPC = "https://arb1.arbitrum.io/rpc"

	// Known Arbitrum addresses
	WETH_ADDRESS = "0x82aF49447D8a07e3bd95BD0d56f35241523fBab1"
	USDC_ADDRESS = "0xaf88d065e77c8cC2239327C5EDb3A432268e5831"

	UNISWAP_V3_FACTORY     = "0x1F98431c8aD98523631AE4a59f267346ea31F984"
	WETH_USDC_POOL_500_FEE = "0xC6962004f452bE9203591991D15f6b388e09E8D0"
)

// TestForkContractDeployment tests deploying contracts to an Arbitrum fork
func TestForkContractDeployment(t *testing.T) {
	// Skip if not running integration tests
	if testing.Short() {
		t.Skip("Skipping integration test in short mode")
	}

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
	defer cancel()

	// Connect to Arbitrum fork
	client, err := ethclient.DialContext(ctx, ArbitrumRPC)
	require.NoError(t, err, "Failed to connect to Arbitrum RPC")
	defer client.Close()

	chainID, err := client.ChainID(ctx)
	require.NoError(t, err, "Failed to get chain ID")
	t.Logf("Connected to chain ID: %s", chainID.String())

	// Create test account with private key
	privateKey, err := crypto.GenerateKey()
	require.NoError(t, err, "Failed to generate private key")

	auth, err := bind.NewKeyedTransactorWithChainID(privateKey, chainID)
	require.NoError(t, err, "Failed to create transactor")

	// Set gas limits
	auth.GasLimit = 5000000

	t.Logf("Test account: %s", auth.From.Hex())

	// Note: Actual deployment would happen here using generated bindings
	// Example (uncomment after binding generation):
	/*
		// Deploy UniswapV3FlashSwapper
		flashSwapperAddr, tx, flashSwapper, err := contracts.DeployUniswapV3FlashSwapper(
			auth,
			client,
			common.HexToAddress(UNISWAP_V3_FACTORY),
		)
		require.NoError(t, err, "Failed to deploy UniswapV3FlashSwapper")

		t.Logf("UniswapV3FlashSwapper deployed at: %s", flashSwapperAddr.Hex())
		t.Logf("Deployment tx: %s", tx.Hash().Hex())

		// Wait for deployment
		receipt, err := bind.WaitMined(ctx, client, tx)
		require.NoError(t, err, "Failed to wait for deployment")
		require.Equal(t, uint64(1), receipt.Status, "Deployment failed")

		// Deploy ArbitrageExecutor
		arbExecutorAddr, tx, arbExecutor, err := contracts.DeployArbitrageExecutor(
			auth,
			client,
			flashSwapperAddr,
		)
		require.NoError(t, err, "Failed to deploy ArbitrageExecutor")

		t.Logf("ArbitrageExecutor deployed at: %s", arbExecutorAddr.Hex())

		receipt, err = bind.WaitMined(ctx, client, tx)
		require.NoError(t, err, "Failed to wait for deployment")
		require.Equal(t, uint64(1), receipt.Status, "Deployment failed")
	*/

	t.Log("Contract deployment test structure ready")
}

// TestForkFlashSwapFeeCalculation tests flash swap fee calculation on fork
func TestForkFlashSwapFeeCalculation(t *testing.T) {
	if testing.Short() {
		t.Skip("Skipping integration test in short mode")
	}

	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
	defer cancel()

	client, err := ethclient.DialContext(ctx, ArbitrumRPC)
	require.NoError(t, err, "Failed to connect to Arbitrum RPC")
	defer client.Close()

	// Note: After binding generation, this would use the actual contract binding
	/*
		flashSwapper, err := contracts.NewUniswapV3FlashSwapper(
			common.HexToAddress("YOUR_DEPLOYED_ADDRESS"),
			client,
		)
		require.NoError(t, err, "Failed to create flash swapper binding")

		// Test fee calculation for 0.05% pool
		amount0 := big.NewInt(100_000_000) // 100 USDC (6 decimals)
		amount1 := big.NewInt(0)

		fee0, fee1, err := flashSwapper.CalculateFlashSwapFee(
			&bind.CallOpts{Context: ctx},
			common.HexToAddress(WETH_USDC_POOL_500_FEE),
			amount0,
			amount1,
		)
		require.NoError(t, err, "Failed to calculate flash swap fee")

		t.Logf("Borrow amount: %s USDC", amount0.String())
		t.Logf("Flash loan fee: %s", fee0.String())

		// For 0.05% fee tier on 100 USDC: fee = 100 * 0.0005 = 0.05 USDC = 50000 (6 decimals)
		expectedFee := big.NewInt(50000)
		require.Equal(t, expectedFee.String(), fee0.String(), "Fee calculation incorrect")
	*/

	t.Log("Flash swap fee calculation test structure ready")
}

// TestForkArbitrageCalculation tests arbitrage profit calculation
func TestForkArbitrageCalculation(t *testing.T) {
	if testing.Short() {
		t.Skip("Skipping integration test in short mode")
	}

	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
	defer cancel()

	client, err := ethclient.DialContext(ctx, ArbitrumRPC)
	require.NoError(t, err, "Failed to connect to Arbitrum RPC")
	defer client.Close()

	// Note: After binding generation
	/*
		arbExecutor, err := contracts.NewArbitrageExecutor(
			common.HexToAddress("YOUR_DEPLOYED_ADDRESS"),
			client,
		)
		require.NoError(t, err, "Failed to create arbitrage executor binding")

		// Create test arbitrage params
		params := contracts.IArbitrageArbitrageParams{
			Tokens: []common.Address{
				common.HexToAddress(WETH_ADDRESS),
				common.HexToAddress(USDC_ADDRESS),
				common.HexToAddress(WETH_ADDRESS),
			},
			Pools: []common.Address{
				common.HexToAddress("POOL_1"),
				common.HexToAddress("POOL_2"),
			},
			Amounts: []*big.Int{
				big.NewInt(1000000000000000000), // 1 WETH
				big.NewInt(2000000000),           // 2000 USDC
			},
			SwapData: [][]byte{
				[]byte("swap_data_1"),
				[]byte("swap_data_2"),
			},
			MinProfit: big.NewInt(1000000000000000), // 0.001 WETH minimum profit
		}

		expectedProfit, err := arbExecutor.CalculateArbitrageProfit(
			&bind.CallOpts{Context: ctx},
			params,
		)
		require.NoError(t, err, "Failed to calculate arbitrage profit")

		t.Logf("Expected arbitrage profit: %s", expectedProfit.String())
		require.True(t, expectedProfit.Cmp(big.NewInt(0)) >= 0, "Expected profit should be non-negative")
	*/

	t.Log("Arbitrage calculation test structure ready")
}

// TestForkEndToEndArbitrage tests the complete arbitrage flow
func TestForkEndToEndArbitrage(t *testing.T) {
	if testing.Short() {
		t.Skip("Skipping integration test in short mode")
	}

	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Minute)
	defer cancel()

	t.Log("=== End-to-End Arbitrage Test ===")

	// 1. Connect to fork
	client, err := ethclient.DialContext(ctx, ArbitrumRPC)
	require.NoError(t, err, "Failed to connect to Arbitrum RPC")
	defer client.Close()

	chainID, err := client.ChainID(ctx)
	require.NoError(t, err)
	t.Logf("Connected to chain ID: %s", chainID.String())

	// 2. Setup test account
	privateKey, err := crypto.GenerateKey()
	require.NoError(t, err)

	auth, err := bind.NewKeyedTransactorWithChainID(privateKey, chainID)
	require.NoError(t, err)
	auth.GasLimit = 5000000

	t.Logf("Test account: %s", auth.From.Hex())

	// 3. Deploy contracts (placeholder)
	t.Log("Step 1: Deploy contracts")
	// Actual deployment with bindings goes here

	// 4. Configure contracts
	t.Log("Step 2: Configure contracts")
	// Set authorized callers, DEXes, pools, etc.

	// 5. Fund contracts with test tokens
	t.Log("Step 3: Fund contracts with test tokens")
	// Transfer WETH, USDC to test account and contracts

	// 6. Execute test arbitrage
	t.Log("Step 4: Execute arbitrage")
	/*
		// Build arbitrage params
		params := contracts.IArbitrageArbitrageParams{
			Tokens: []common.Address{
				common.HexToAddress(WETH_ADDRESS),
				common.HexToAddress(USDC_ADDRESS),
				common.HexToAddress(WETH_ADDRESS),
			},
			Pools: []common.Address{
				common.HexToAddress(WETH_USDC_POOL_500_FEE),
				common.HexToAddress("SECOND_POOL"),
			},
			Amounts: []*big.Int{
				big.NewInt(1000000000000000000), // 1 WETH
				big.NewInt(2000000000),           // 2000 USDC
			},
			SwapData: [][]byte{
				buildSwapData(),
				buildSwapData(),
			},
			MinProfit: big.NewInt(1000000000000000), // 0.001 WETH
		}

		// Execute arbitrage
		tx, err := arbExecutor.ExecuteArbitrage(auth, params)
		require.NoError(t, err, "Failed to execute arbitrage")

		t.Logf("Arbitrage tx: %s", tx.Hash().Hex())

		// Wait for confirmation
		receipt, err := bind.WaitMined(ctx, client, tx)
		require.NoError(t, err, "Failed to wait for tx")
		require.Equal(t, uint64(1), receipt.Status, "Arbitrage transaction failed")

		// Check events
		t.Log("Step 5: Verify arbitrage events")
		// Parse ArbitrageExecuted event
	*/

	// 7. Verify profit
	t.Log("Step 5: Verify profit")
	// Check final balances

	t.Log("=== End-to-End Test Complete ===")
}

// TestForkDataFetcher tests the DataFetcher contract
func TestForkDataFetcher(t *testing.T) {
	if testing.Short() {
		t.Skip("Skipping integration test in short mode")
	}

	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
	defer cancel()

	client, err := ethclient.DialContext(ctx, ArbitrumRPC)
	require.NoError(t, err)
	defer client.Close()

	/*
		dataFetcher, err := contracts.NewDataFetcher(
			common.HexToAddress("YOUR_DEPLOYED_ADDRESS"),
			client,
		)
		require.NoError(t, err)

		// Build batch request
		req := contracts.DataFetcherBatchRequest{
			V2Pools: []common.Address{},
			V3Pools: []common.Address{
				common.HexToAddress(WETH_USDC_POOL_500_FEE),
			},
		}

		// Fetch batch data
		response, err := dataFetcher.BatchFetchAllData(
			&bind.CallOpts{Context: ctx},
			req,
		)
		require.NoError(t, err, "Failed to fetch batch data")

		t.Logf("Fetched %d V3 pool data entries", len(response.V3PoolData))

		for i, poolData := range response.V3PoolData {
			t.Logf("Pool %d:", i)
			t.Logf("  Token0: %s", poolData.Token0.Hex())
			t.Logf("  Token1: %s", poolData.Token1.Hex())
			t.Logf("  Liquidity: %s", poolData.Liquidity.String())
		}
	*/

	t.Log("DataFetcher test structure ready")
}