package arbitrum

import (
	"context"
	"fmt"
	"testing"
	"time"

	"github.com/fraktal/mev-beta/internal/logger"
)

func TestRPCManagerRoundRobin(t *testing.T) {
	log := &logger.Logger{}

	manager := NewRPCManager(log)

	if len(manager.endpoints) != 0 {
		t.Errorf("Expected 0 endpoints, got %d", len(manager.endpoints))
	}
}

func TestRPCManagerHealthTracking(t *testing.T) {
	log := &logger.Logger{}
	_ = NewRPCManager(log)

	// Create health tracker
	health := &RPCEndpointHealth{
		URL: "https://test.rpc.io",
	}

	// Record success
	health.RecordSuccess(50 * time.Millisecond)
	success, failure, consecutive, healthy := health.GetStats()

	if success != 1 {
		t.Errorf("Expected 1 success, got %d", success)
	}
	if failure != 0 {
		t.Errorf("Expected 0 failures, got %d", failure)
	}
	if !healthy {
		t.Errorf("Expected healthy=true, got %v", healthy)
	}
	if consecutive != 0 {
		t.Errorf("Expected 0 consecutive failures, got %d", consecutive)
	}
}

func TestRPCManagerConsecutiveFailures(t *testing.T) {
	logger := &logger.Logger{}
	_ = logger

	health := &RPCEndpointHealth{
		URL: "https://test.rpc.io",
	}

	// Record 3 failures
	for i := 0; i < 3; i++ {
		health.RecordFailure()
	}

	_, failure, consecutive, healthy := health.GetStats()

	if failure != 3 {
		t.Errorf("Expected 3 failures, got %d", failure)
	}
	if consecutive != 3 {
		t.Errorf("Expected 3 consecutive failures, got %d", consecutive)
	}
	if healthy {
		t.Errorf("Expected healthy=false after 3 consecutive failures, got %v", healthy)
	}

	// Record a success - should reset consecutive failures
	health.RecordSuccess(100 * time.Millisecond)
	_, _, consecutive, healthy = health.GetStats()

	if consecutive != 0 {
		t.Errorf("Expected 0 consecutive failures after success, got %d", consecutive)
	}
	if !healthy {
		t.Errorf("Expected healthy=true after success, got %v", healthy)
	}
}

func TestRPCManagerRotationSelection(t *testing.T) {
	log := &logger.Logger{}
	manager := NewRPCManager(log)

	// Test with nil endpoints - should fail
	_, _, err := manager.GetNextClient(context.Background())
	if err == nil {
		t.Errorf("Expected error for empty endpoints, got nil")
	}
}

func TestRPCEndpointHealthStats(t *testing.T) {
	log := &logger.Logger{}
	_ = NewRPCManager(log)

	// Add some health data
	health := &RPCEndpointHealth{
		URL: "https://test.rpc.io",
	}

	// Record multiple operations
	health.RecordSuccess(45 * time.Millisecond)
	health.RecordSuccess(55 * time.Millisecond)
	health.RecordFailure()
	health.RecordSuccess(50 * time.Millisecond)

	success, failure, consecutive, healthy := health.GetStats()

	if success != 3 {
		t.Errorf("Expected 3 successes, got %d", success)
	}
	if failure != 1 {
		t.Errorf("Expected 1 failure, got %d", failure)
	}
	if !healthy {
		t.Errorf("Expected healthy=true after recovery, got %v", healthy)
	}
	if consecutive != 0 {
		t.Errorf("Expected 0 consecutive failures after recovery, got %d", consecutive)
	}
}

func TestRPCManagerStats(t *testing.T) {
	logger := &logger.Logger{}
	manager := NewRPCManager(logger)

	stats := manager.GetStats()

	if stats["total_endpoints"] != 0 {
		t.Errorf("Expected 0 endpoints, got %d", stats["total_endpoints"])
	}

	totalRequests, ok := stats["total_requests"]
	if !ok || totalRequests.(int64) != 0 {
		t.Errorf("Expected 0 total requests")
	}
}

func TestRoundRobinSelection(t *testing.T) {
	logger := &logger.Logger{}
	manager := NewRPCManager(logger)
	manager.SetRotationPolicy(RoundRobin)

	// Simulate 10 selections
	for i := 0; i < 10; i++ {
		idx := manager.selectRoundRobin()
		if idx < 0 {
			t.Errorf("Got negative index %d on iteration %d", idx, i)
		}
	}
}

func TestRotationPolicySetting(t *testing.T) {
	logger := &logger.Logger{}
	manager := NewRPCManager(logger)

	manager.SetRotationPolicy(HealthAware)
	if manager.rotationPolicy != HealthAware {
		t.Errorf("Expected HealthAware policy, got %s", manager.rotationPolicy)
	}

	manager.SetRotationPolicy(LeastFailures)
	if manager.rotationPolicy != LeastFailures {
		t.Errorf("Expected LeastFailures policy, got %s", manager.rotationPolicy)
	}

	manager.SetRotationPolicy(RoundRobin)
	if manager.rotationPolicy != RoundRobin {
		t.Errorf("Expected RoundRobin policy, got %s", manager.rotationPolicy)
	}
}

// BenchmarkRoundRobinSelection benchmarks the round-robin selection
func BenchmarkRoundRobinSelection(b *testing.B) {
	logger := &logger.Logger{}
	manager := NewRPCManager(logger)
	manager.SetRotationPolicy(RoundRobin)

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		_ = manager.selectRoundRobin()
	}
}

// Example demonstrates basic RPC Manager usage
func Example() {
	logger := &logger.Logger{}
	manager := NewRPCManager(logger)

	// Set rotation policy
	manager.SetRotationPolicy(HealthAware)

	// Record some operations
	health1 := &RPCEndpointHealth{URL: "https://rpc1.io"}
	health1.RecordSuccess(50 * time.Millisecond)
	health1.RecordSuccess(45 * time.Millisecond)

	health2 := &RPCEndpointHealth{URL: "https://rpc2.io"}
	health2.RecordSuccess(100 * time.Millisecond)
	health2.RecordFailure()

	fmt.Printf("Endpoint 1: Health tracking initialized\n")
	fmt.Printf("Endpoint 2: Health tracking initialized\n")

	// Output:
	// Endpoint 1: Health tracking initialized
	// Endpoint 2: Health tracking initialized
}