package twilio

import (
	"context"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"github.com/yaoapp/yao/messenger/types"
)

// Test phone numbers for WhatsApp (placeholder for future implementation)
const (
	TestWhatsAppPhoneAgent = "+1234567890" // Placeholder - replace with authorized WhatsApp Business numbers
	TestWhatsAppPhoneX     = "+1234567891" // Placeholder - replace with authorized WhatsApp Business numbers
	TestWhatsAppPhoneXiang = "+1234567892" // Placeholder - replace with authorized WhatsApp Business numbers
)

// createTestWhatsAppMessage creates a test WhatsApp message
func createTestWhatsAppMessage() *types.Message {
	return &types.Message{
		Type: types.MessageTypeWhatsApp,
		To:   []string{TestWhatsAppPhoneAgent},
		Body: "Test WhatsApp message from Twilio Provider - Hello from Yao! 👋",
	}
}

// loadWhatsAppTestConfig loads configuration optimized for WhatsApp testing
func loadWhatsAppTestConfig(t *testing.T) types.ProviderConfig {
	config := loadTestConfig(t) // Reuse base config loading

	// Ensure WhatsApp-specific options are available
	// In real implementation, verify TWILIO_FROM_PHONE is a WhatsApp Business number

	return config
}

// =============================================================================
// WhatsApp Provider Configuration Tests
// =============================================================================

func TestWhatsApp_ProviderConfig_WithFromPhone(t *testing.T) {
	config := types.ProviderConfig{
		Name:      "whatsapp_test",
		Connector: "twilio",
		Options: map[string]interface{}{
			"account_sid": "test_account_sid",
			"auth_token":  "test_auth_token",
			"from_phone":  "+15551234567", // WhatsApp requires from_phone (WhatsApp Business number)
		},
	}

	provider, err := NewTwilioProvider(config)
	require.NoError(t, err)
	assert.NotNil(t, provider)
	assert.Equal(t, "+15551234567", provider.fromPhone)
}

func TestWhatsApp_ProviderConfig_MissingFromPhone(t *testing.T) {
	config := types.ProviderConfig{
		Name:      "whatsapp_test",
		Connector: "twilio",
		Options: map[string]interface{}{
			"account_sid": "test_account_sid",
			"auth_token":  "test_auth_token",
			// Missing from_phone - required for WhatsApp
		},
	}

	provider, err := NewTwilioProvider(config)
	require.NoError(t, err)

	ctx := context.Background()
	whatsappMessage := createTestWhatsAppMessage()

	err = provider.Send(ctx, whatsappMessage)
	assert.Error(t, err)
	assert.Contains(t, err.Error(), "from_phone is required for WhatsApp messages")
}

func TestWhatsApp_PhoneNumberFormatting(t *testing.T) {
	// Test that phone numbers are properly formatted with whatsapp: prefix
	// This tests the internal logic without making API calls

	config := types.ProviderConfig{
		Name:      "whatsapp_test",
		Connector: "twilio",
		Options: map[string]interface{}{
			"account_sid": "test_account_sid",
			"auth_token":  "test_auth_token",
			"from_phone":  "+15551234567", // Will be formatted to whatsapp:+15551234567
		},
	}

	provider, err := NewTwilioProvider(config)
	require.NoError(t, err)

	// Test internal phone number formatting logic
	// In real implementation, we'd test the sendWhatsAppToRecipient method
	// For now, just verify the provider stores the number correctly
	assert.Equal(t, "+15551234567", provider.fromPhone)
	assert.False(t, strings.HasPrefix(provider.fromPhone, "whatsapp:"))

	// The whatsapp: prefix should be added during sending, not during configuration
}

// =============================================================================
// WhatsApp Sending Tests (Future Implementation)
// =============================================================================

// TODO: Implement real WhatsApp sending tests
func TestSend_WhatsAppMessage_RealAPI(t *testing.T) {
	t.Skip("WhatsApp real API tests not implemented yet - placeholder for future implementation")

	// Future implementation will test:
	// config := loadWhatsAppTestConfig(t)
	// provider, err := NewTwilioProvider(config)
	// require.NoError(t, err)
	//
	// // Skip if from_phone is not configured or not a WhatsApp Business number
	// if provider.fromPhone == "" {
	//     t.Skip("TWILIO_FROM_PHONE not configured, skipping real WhatsApp API test")
	// }
	//
	// ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	// defer cancel()
	//
	// whatsappMessage := createTestWhatsAppMessage()
	// err = provider.Send(ctx, whatsappMessage)
	// if err == nil {
	//     t.Log("Real Twilio WhatsApp API call succeeded")
	// } else {
	//     t.Logf("Real Twilio WhatsApp API call failed: %v", err)
	//     // Handle expected failures in test environments
	// }
}

func TestSend_WhatsAppMessage_PhoneNumberFormatting_RealAPI(t *testing.T) {
	t.Skip("WhatsApp phone formatting real API tests not implemented yet - placeholder for future implementation")

	// Future implementation will test:
	// - Automatic "whatsapp:" prefix addition for both from and to numbers
	// - Handling of numbers that already have the prefix
	// - International phone number format validation
	// - E.164 format compliance
	// - Error handling for invalid WhatsApp numbers
}

func TestSend_WhatsAppMessage_ContextTimeout_RealAPI(t *testing.T) {
	t.Skip("WhatsApp context timeout tests not implemented yet - placeholder for future implementation")

	// Future implementation will test:
	// config := loadWhatsAppTestConfig(t)
	// provider, err := NewTwilioProvider(config)
	// require.NoError(t, err)
	//
	// // Create a very short timeout context
	// ctx, cancel := context.WithTimeout(context.Background(), 1*time.Millisecond)
	// defer cancel()
	//
	// whatsappMessage := createTestWhatsAppMessage()
	// err = provider.Send(ctx, whatsappMessage)
	// if err != nil {
	//     t.Log("Context timeout working correctly with real WhatsApp API")
	// }
}

func TestSendBatch_WhatsApp_RealAPI(t *testing.T) {
	t.Skip("WhatsApp batch real API tests not implemented yet - placeholder for future implementation")

	// Future implementation will test:
	// config := loadWhatsAppTestConfig(t)
	// provider, err := NewTwilioProvider(config)
	// require.NoError(t, err)
	//
	// ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
	// defer cancel()
	//
	// messages := []*types.Message{
	//     {
	//         Type: types.MessageTypeWhatsApp,
	//         To:   []string{TestWhatsAppPhoneAgent},
	//         Body: "Batch WhatsApp Test 1 - Hello! 👋",
	//     },
	//     {
	//         Type: types.MessageTypeWhatsApp,
	//         To:   []string{TestWhatsAppPhoneX},
	//         Body: "Batch WhatsApp Test 2 - How are you? 😊",
	//     },
	// }
	//
	// err = provider.SendBatch(ctx, messages)
	// if err == nil {
	//     t.Log("Real Twilio WhatsApp batch API call succeeded")
	// }
}

func TestSend_WhatsApp_MultipleRecipients_RealAPI(t *testing.T) {
	t.Skip("WhatsApp multiple recipients tests not implemented yet - placeholder for future implementation")

	// Future implementation will test:
	// config := loadWhatsAppTestConfig(t)
	// provider, err := NewTwilioProvider(config)
	// require.NoError(t, err)
	//
	// ctx, cancel := context.WithTimeout(context.Background(), 45*time.Second)
	// defer cancel()
	//
	// whatsappMessage := &types.Message{
	//     Type: types.MessageTypeWhatsApp,
	//     To:   []string{TestWhatsAppPhoneAgent, TestWhatsAppPhoneX, TestWhatsAppPhoneXiang},
	//     Body: "Multi-recipient WhatsApp test from Twilio Provider 🚀",
	// }
	//
	// err = provider.Send(ctx, whatsappMessage)
	// if err == nil {
	//     t.Log("Twilio WhatsApp multiple recipients API call succeeded")
	// }
}

// =============================================================================
// WhatsApp Advanced Features Tests (Future Implementation)
// =============================================================================

func TestSend_WhatsApp_WithMediaMessage(t *testing.T) {
	t.Skip("WhatsApp media message tests not implemented yet - placeholder for future implementation")

	// Future implementation will test:
	// - Image messages with media URLs
	// - Document attachments
	// - Audio messages
	// - Video messages
	// - Media size and format validation
}

func TestSend_WhatsApp_WithTemplateMessage(t *testing.T) {
	t.Skip("WhatsApp template message tests not implemented yet - placeholder for future implementation")

	// Future implementation will test:
	// - WhatsApp Business template messages
	// - Template parameter substitution
	// - Template approval status handling
	// - Language-specific templates
	// - Template versioning
}

func TestSend_WhatsApp_WithInteractiveMessage(t *testing.T) {
	t.Skip("WhatsApp interactive message tests not implemented yet - placeholder for future implementation")

	// Future implementation will test:
	// - Button messages
	// - List messages
	// - Quick reply buttons
	// - Interactive message validation
	// - Response handling
}

func TestSend_WhatsApp_WithLocationMessage(t *testing.T) {
	t.Skip("WhatsApp location message tests not implemented yet - placeholder for future implementation")

	// Future implementation will test:
	// - Location sharing messages
	// - Address and coordinates
	// - Location name and description
	// - Venue information
}

func TestSend_WhatsApp_WithContactMessage(t *testing.T) {
	t.Skip("WhatsApp contact message tests not implemented yet - placeholder for future implementation")

	// Future implementation will test:
	// - Contact card messages
	// - vCard format support
	// - Multiple contact sharing
	// - Contact information validation
}

// =============================================================================
// WhatsApp Business Features Tests (Future Implementation)
// =============================================================================

func TestSend_WhatsApp_BusinessProfile(t *testing.T) {
	t.Skip("WhatsApp Business profile tests not implemented yet - placeholder for future implementation")

	// Future implementation will test:
	// - Business profile information
	// - Verified business badge
	// - Business hours and description
	// - Website and contact info
}

func TestSend_WhatsApp_OptInOptOut(t *testing.T) {
	t.Skip("WhatsApp opt-in/out tests not implemented yet - placeholder for future implementation")

	// Future implementation will test:
	// - User opt-in confirmation
	// - Opt-out request handling
	// - Compliance with WhatsApp policies
	// - Subscription management
}

func TestSend_WhatsApp_MessageStatus(t *testing.T) {
	t.Skip("WhatsApp message status tests not implemented yet - placeholder for future implementation")

	// Future implementation will test:
	// - Message delivery status
	// - Read receipts
	// - Failed message handling
	// - Status webhook configuration
}

// =============================================================================
// WhatsApp Error Handling Tests (Future Implementation)
// =============================================================================

func TestSend_WhatsApp_InvalidPhoneNumber(t *testing.T) {
	t.Skip("WhatsApp invalid phone tests not implemented yet - placeholder for future implementation")

	// Future implementation will test:
	// - Invalid WhatsApp number format errors
	// - Non-WhatsApp numbers
	// - Blocked or suspended numbers
	// - Number verification failures
}

func TestSend_WhatsApp_RateLimiting(t *testing.T) {
	t.Skip("WhatsApp rate limiting tests not implemented yet - placeholder for future implementation")

	// Future implementation will test:
	// - WhatsApp Business API rate limits
	// - 24-hour messaging window
	// - Template message limits
	// - Conversation-based pricing
}

func TestSend_WhatsApp_PolicyViolation(t *testing.T) {
	t.Skip("WhatsApp policy tests not implemented yet - placeholder for future implementation")

	// Future implementation will test:
	// - Content policy violations
	// - Spam detection and prevention
	// - Business policy compliance
	// - Account suspension scenarios
}

func TestSend_WhatsApp_APIError_Scenarios(t *testing.T) {
	t.Skip("WhatsApp API error tests not implemented yet - placeholder for future implementation")

	// Future implementation will test:
	// - Various WhatsApp API error codes
	// - Network timeout handling
	// - Authentication failures
	// - Service unavailable scenarios
	// - Webhook delivery failures
}

// =============================================================================
// WhatsApp Benchmark Tests (Future Implementation)
// =============================================================================

func BenchmarkSend_WhatsApp(b *testing.B) {
	b.Skip("WhatsApp benchmarks not implemented yet - placeholder for future implementation")

	// Future implementation will benchmark:
	// - Single WhatsApp message sending performance
	// - Memory allocation patterns
	// - Connection reuse efficiency
	// - Media message processing time
}

func BenchmarkSendBatch_WhatsApp(b *testing.B) {
	b.Skip("WhatsApp batch benchmarks not implemented yet - placeholder for future implementation")

	// Future implementation will benchmark:
	// - Batch WhatsApp sending throughput
	// - Optimal batch sizes for WhatsApp
	// - Resource utilization under load
	// - Template message processing efficiency
}
