package execution

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

	"github.com/ethereum/go-ethereum/common"
	"github.com/stretchr/testify/assert"
)

func TestExecutionModes(t *testing.T) {
	// Test that execution modes are properly defined
	assert.Equal(t, ExecutionMode(0), SimulationMode)
	assert.Equal(t, ExecutionMode(1), DryRunMode)
	assert.Equal(t, ExecutionMode(2), LiveMode)
}

func TestExecutionConfigDefaults(t *testing.T) {
	config := &ExecutionConfig{
		Mode:        SimulationMode,
		MaxSlippage: 0.05,
		MaxRetries:  3,
		RetryDelay:  1 * time.Second,
		DryRun:      true,
	}

	assert.Equal(t, SimulationMode, config.Mode)
	assert.Equal(t, 0.05, config.MaxSlippage)
	assert.Equal(t, 3, config.MaxRetries)
	assert.Equal(t, true, config.DryRun)
}

func TestExecutionResultCreation(t *testing.T) {
	result := &ExecutionResult{
		OpportunityID:   "test_opp_001",
		Success:         true,
		TxHash:          common.HexToHash("0x1234567890abcdef"),
		GasUsed:         100000,
		ActualProfit:    big.NewInt(1000),
		EstimatedProfit: big.NewInt(1100),
		SlippagePercent: 0.5,
		ExecutionTime:   1500 * time.Millisecond,
		Timestamp:       time.Now(),
	}

	assert.NotNil(t, result)
	assert.Equal(t, "test_opp_001", result.OpportunityID)
	assert.True(t, result.Success)
	assert.NotNil(t, result.TxHash)
	assert.Equal(t, uint64(100000), result.GasUsed)
	assert.NotNil(t, result.ActualProfit)
	assert.NotNil(t, result.EstimatedProfit)
}

func TestExecutionResultWithError(t *testing.T) {
	result := &ExecutionResult{
		OpportunityID: "test_opp_002",
		Success:       false,
		Error:         assert.AnError,
		Timestamp:     time.Now(),
	}

	assert.NotNil(t, result)
	assert.False(t, result.Success)
	assert.NotNil(t, result.Error)
}

func TestSimulationMode(t *testing.T) {
	config := &ExecutionConfig{
		Mode:   SimulationMode,
		DryRun: true,
	}

	// In simulation mode, no transactions should be sent
	assert.Equal(t, SimulationMode, config.Mode)
	assert.True(t, config.DryRun)
}

func TestDryRunMode(t *testing.T) {
	config := &ExecutionConfig{
		Mode:   DryRunMode,
		DryRun: true,
	}

	// In dry run mode, validate but don't execute
	assert.Equal(t, DryRunMode, config.Mode)
	assert.True(t, config.DryRun)
}

func TestLiveMode(t *testing.T) {
	config := &ExecutionConfig{
		Mode:   LiveMode,
		DryRun: false,
	}

	// In live mode, execute real transactions
	assert.Equal(t, LiveMode, config.Mode)
	assert.False(t, config.DryRun)
}

func TestExecutionConfigWithGasPrice(t *testing.T) {
	maxGasPrice := big.NewInt(100000000) // 0.1 gwei

	config := &ExecutionConfig{
		Mode:        DryRunMode,
		MaxGasPrice: maxGasPrice,
		MaxSlippage: 0.03,
	}

	assert.NotNil(t, config.MaxGasPrice)
	assert.Equal(t, maxGasPrice, config.MaxGasPrice)
	assert.Equal(t, 0.03, config.MaxSlippage)
}

func TestExecutionConfigWithMinProfit(t *testing.T) {
	minProfit := big.NewInt(1000000000000000) // 0.001 ETH

	config := &ExecutionConfig{
		Mode:               SimulationMode,
		MinProfitThreshold: minProfit,
	}

	assert.NotNil(t, config.MinProfitThreshold)
	assert.Equal(t, minProfit, config.MinProfitThreshold)
}

func TestExecutionFlashLoanConfig(t *testing.T) {
	config := &ExecutionConfig{
		Mode:              LiveMode,
		FlashLoanProvider: "balancer",
		MaxRetries:        5,
		RetryDelay:        500 * time.Millisecond,
	}

	assert.Equal(t, "balancer", config.FlashLoanProvider)
	assert.Equal(t, 5, config.MaxRetries)
	assert.Equal(t, 500*time.Millisecond, config.RetryDelay)
}

func TestExecutionParallelConfig(t *testing.T) {
	config := &ExecutionConfig{
		Mode:               DryRunMode,
		EnableParallelExec: true,
		MaxRetries:         3,
	}

	assert.True(t, config.EnableParallelExec)
	assert.Equal(t, 3, config.MaxRetries)
}

func TestExecutionTimestamp(t *testing.T) {
	before := time.Now()
	result := &ExecutionResult{
		OpportunityID: "test_opp_003",
		Success:       true,
		Timestamp:     time.Now(),
	}
	after := time.Now()

	assert.True(t, result.Timestamp.After(before) || result.Timestamp.Equal(before))
	assert.True(t, result.Timestamp.Before(after) || result.Timestamp.Equal(after))
}

func TestMultipleExecutionResults(t *testing.T) {
	results := make([]*ExecutionResult, 5)

	for i := 0; i < 5; i++ {
		results[i] = &ExecutionResult{
			OpportunityID: "opp_" + string(rune(i)),
			Success:       i%2 == 0,
			GasUsed:       uint64(100000 + i*1000),
			ActualProfit:  big.NewInt(int64(1000 * (i + 1))),
			ExecutionTime: time.Duration(1000*(i+1)) * time.Millisecond,
			Timestamp:     time.Now(),
		}
	}

	assert.Equal(t, 5, len(results))
	for i, result := range results {
		assert.NotNil(t, result)
		assert.NotEmpty(t, result.OpportunityID)
		assert.Equal(t, i%2 == 0, result.Success)
	}
}

func TestExecutionResultWithZeroProfit(t *testing.T) {
	result := &ExecutionResult{
		OpportunityID:   "zero_profit_opp",
		Success:         true,
		ActualProfit:    big.NewInt(0),
		EstimatedProfit: big.NewInt(100),
		Timestamp:       time.Now(),
	}

	assert.NotNil(t, result)
	assert.True(t, result.Success)
	assert.Equal(t, int64(0), result.ActualProfit.Int64())
}

func TestExecutionResultWithNegativeProfit(t *testing.T) {
	result := &ExecutionResult{
		OpportunityID:   "loss_opp",
		Success:         false,
		ActualProfit:    big.NewInt(-500),
		EstimatedProfit: big.NewInt(100),
		Timestamp:       time.Now(),
	}

	assert.NotNil(t, result)
	assert.False(t, result.Success)
	assert.True(t, result.ActualProfit.Sign() < 0)
}

func TestContextTimeout(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
	defer cancel()

	config := &ExecutionConfig{
		Mode:   SimulationMode,
		DryRun: true,
	}

	// Should handle context timeout gracefully
	assert.NotNil(t, config)
	<-ctx.Done()
	assert.Error(t, ctx.Err())
}

func TestExecutionConfigValidation(t *testing.T) {
	configs := []struct {
		name   string
		config *ExecutionConfig
		valid  bool
	}{
		{
			name:   "Valid simulation config",
			config: &ExecutionConfig{Mode: SimulationMode, DryRun: true},
			valid:  true,
		},
		{
			name:   "Valid dry run config",
			config: &ExecutionConfig{Mode: DryRunMode, DryRun: true},
			valid:  true,
		},
		{
			name:   "Valid live config",
			config: &ExecutionConfig{Mode: LiveMode, DryRun: false},
			valid:  true,
		},
		{
			name:   "Config with max gas price",
			config: &ExecutionConfig{MaxGasPrice: big.NewInt(100000000)},
			valid:  true,
		},
		{
			name:   "Config with min profit",
			config: &ExecutionConfig{MinProfitThreshold: big.NewInt(1000000000000000)},
			valid:  true,
		},
	}

	for _, tc := range configs {
		t.Run(tc.name, func(t *testing.T) {
			assert.NotNil(t, tc.config)
			assert.Equal(t, tc.valid, tc.valid)
		})
	}
}