package customer

import (
	"context"
	"errors"
	"time"
	"tm/pkg/logger"
	mongopkg "tm/pkg/mongo"

	"go.mongodb.org/mongo-driver/bson"
)

// Repository defines the interface for customer data operations
type Repository interface {
	Create(ctx context.Context, customer *Customer) error
	GetByID(ctx context.Context, id string) (*Customer, error)
	GetByEmail(ctx context.Context, email string) (*Customer, error)
	GetByUsername(ctx context.Context, username string) (*Customer, error)
	GetByCompanyName(ctx context.Context, companyName string) (*Customer, error)
	GetByRegistrationNumber(ctx context.Context, registrationNumber string) (*Customer, error)
	GetByTaxID(ctx context.Context, taxID string) (*Customer, error)
	GetByCompanyID(ctx context.Context, companyID string, limit, offset int) ([]*Customer, error)
	GetByCompanyIDs(ctx context.Context, companyIDs []string, limit, offset int) ([]*Customer, error)
	Update(ctx context.Context, customer *Customer) error
	Delete(ctx context.Context, id string) error
	List(ctx context.Context, limit, offset int) ([]*Customer, error)
	Search(ctx context.Context, search string, customerType *string, status *string, companyID *string, industry *string, isVerified *bool, isCompliant *bool, language *string, currency *string, limit, offset int, sortBy, sortOrder string) ([]*Customer, error)
	CountByCompanyID(ctx context.Context, companyID string) (int64, error)
	CountByCompanyIDs(ctx context.Context, companyIDs []string) (int64, error)
	CountByType(ctx context.Context, customerType CustomerType) (int64, error)
	CountByStatus(ctx context.Context, status CustomerStatus) (int64, error)
	UpdateStatus(ctx context.Context, id string, status CustomerStatus) error
	UpdateVerification(ctx context.Context, id string, isVerified, isCompliant bool, complianceNotes *string) error
}

// customerRepository implements the Repository interface using the MongoDB ORM
type customerRepository struct {
	ormRepo mongopkg.Repository[Customer]
	logger  logger.Logger
}

// NewCustomerRepository creates a new customer repository
func NewCustomerRepository(mongoManager *mongopkg.ConnectionManager, logger logger.Logger) Repository {
	// Create indexes using the ORM's index management
	indexes := []mongopkg.Index{
		*mongopkg.CreateUniqueIndex("email_idx", bson.D{{Key: "email", Value: 1}}),
		*mongopkg.CreateUniqueIndex("username_idx", bson.D{{Key: "username", Value: 1}}),
		*mongopkg.NewIndex("company_name_idx", bson.D{{Key: "company_name", Value: 1}}),
		*mongopkg.NewIndex("registration_number_idx", bson.D{{Key: "registration_number", Value: 1}}),
		*mongopkg.NewIndex("tax_id_idx", bson.D{{Key: "tax_id", Value: 1}}),
		*mongopkg.NewIndex("company_ids_idx", bson.D{{Key: "company_ids", Value: 1}}), // Index for CompanyIDs array
		*mongopkg.NewIndex("type_idx", bson.D{{Key: "type", Value: 1}}),
		*mongopkg.NewIndex("status_idx", bson.D{{Key: "status", Value: 1}}),
		*mongopkg.NewIndex("industry_idx", bson.D{{Key: "industry", Value: 1}}),
		*mongopkg.NewIndex("is_verified_idx", bson.D{{Key: "is_verified", Value: 1}}),
		*mongopkg.NewIndex("is_compliant_idx", bson.D{{Key: "is_compliant", Value: 1}}),
		*mongopkg.NewIndex("language_idx", bson.D{{Key: "language", Value: 1}}),
		*mongopkg.NewIndex("currency_idx", bson.D{{Key: "currency", Value: 1}}),
		*mongopkg.NewIndex("created_at_idx", bson.D{{Key: "created_at", Value: -1}}),
		*mongopkg.CreateTextIndex("search_idx", "first_name", "last_name", "full_name", "company_name", "email", "username"),
	}

	// Create indexes
	err := mongoManager.CreateIndexes("customers", indexes)
	if err != nil {
		logger.Warn("Failed to create customer indexes", map[string]interface{}{
			"error": err.Error(),
		})
	}

	// Create ORM repository
	ormRepo := mongopkg.NewRepository[Customer](mongoManager.GetCollection("customers"), logger)

	return &customerRepository{
		ormRepo: ormRepo,
		logger:  logger,
	}
}

// Create creates a new customer
func (r *customerRepository) Create(ctx context.Context, customer *Customer) error {
	// Set created/updated timestamps using Unix timestamps
	now := time.Now().Unix()
	customer.SetCreatedAt(now)
	customer.SetUpdatedAt(now)

	// Use ORM to create customer
	err := r.ormRepo.Create(ctx, customer)
	if err != nil {
		r.logger.Error("Failed to create customer", map[string]interface{}{
			"error":    err.Error(),
			"email":    customer.Email,
			"username": customer.Username,
		})
		return err
	}

	r.logger.Info("Customer created successfully", map[string]interface{}{
		"customer_id": customer.ID,
		"email":       customer.Email,
		"type":        customer.Type,
	})

	return nil
}

// GetByID retrieves a customer by ID
func (r *customerRepository) GetByID(ctx context.Context, id string) (*Customer, error) {
	customer, err := r.ormRepo.FindByID(ctx, id)
	if err != nil {
		if errors.Is(err, mongopkg.ErrDocumentNotFound) {
			return nil, errors.New("customer not found")
		}
		r.logger.Error("Failed to get customer by ID", map[string]interface{}{
			"error":       err.Error(),
			"customer_id": id,
		})
		return nil, err
	}

	return customer, nil
}

// GetByEmail retrieves a customer by email
func (r *customerRepository) GetByEmail(ctx context.Context, email string) (*Customer, error) {
	filter := bson.M{"email": email}
	customer, err := r.ormRepo.FindOne(ctx, filter)
	if err != nil {
		if errors.Is(err, mongopkg.ErrDocumentNotFound) {
			return nil, errors.New("customer not found")
		}
		r.logger.Error("Failed to get customer by email", map[string]interface{}{
			"error": err.Error(),
			"email": email,
		})
		return nil, err
	}

	return customer, nil
}

// GetByUsername retrieves a customer by username
func (r *customerRepository) GetByUsername(ctx context.Context, username string) (*Customer, error) {
	filter := bson.M{"username": username}
	customer, err := r.ormRepo.FindOne(ctx, filter)
	if err != nil {
		if errors.Is(err, mongopkg.ErrDocumentNotFound) {
			return nil, errors.New("customer not found")
		}
		r.logger.Error("Failed to get customer by username", map[string]interface{}{
			"error":    err.Error(),
			"username": username,
		})
		return nil, err
	}

	return customer, nil
}

// GetByCompanyName retrieves a customer by company name
func (r *customerRepository) GetByCompanyName(ctx context.Context, companyName string) (*Customer, error) {
	filter := bson.M{"company_name": companyName}
	customer, err := r.ormRepo.FindOne(ctx, filter)
	if err != nil {
		if errors.Is(err, mongopkg.ErrDocumentNotFound) {
			return nil, errors.New("customer not found")
		}
		r.logger.Error("Failed to get customer by company name", map[string]interface{}{
			"error":        err.Error(),
			"company_name": companyName,
		})
		return nil, err
	}

	return customer, nil
}

// GetByRegistrationNumber retrieves a customer by registration number
func (r *customerRepository) GetByRegistrationNumber(ctx context.Context, registrationNumber string) (*Customer, error) {
	filter := bson.M{"registration_number": registrationNumber}
	customer, err := r.ormRepo.FindOne(ctx, filter)
	if err != nil {
		if errors.Is(err, mongopkg.ErrDocumentNotFound) {
			return nil, errors.New("customer not found")
		}
		r.logger.Error("Failed to get customer by registration number", map[string]interface{}{
			"error":               err.Error(),
			"registration_number": registrationNumber,
		})
		return nil, err
	}

	return customer, nil
}

// GetByTaxID retrieves a customer by tax ID
func (r *customerRepository) GetByTaxID(ctx context.Context, taxID string) (*Customer, error) {
	filter := bson.M{"tax_id": taxID}
	customer, err := r.ormRepo.FindOne(ctx, filter)
	if err != nil {
		if errors.Is(err, mongopkg.ErrDocumentNotFound) {
			return nil, errors.New("customer not found")
		}
		r.logger.Error("Failed to get customer by tax ID", map[string]interface{}{
			"error":  err.Error(),
			"tax_id": taxID,
		})
		return nil, err
	}

	return customer, nil
}

// GetByCompanyID retrieves customers by company ID with pagination
func (r *customerRepository) GetByCompanyID(ctx context.Context, companyID string, limit, offset int) ([]*Customer, error) {
	// Build pagination
	pagination := mongopkg.NewPaginationBuilder().
		Limit(limit).
		Skip(offset).
		SortDesc("created_at").
		Build()

	// Filter by company ID and active status
	filter := bson.M{
		"company_id": companyID,
		"status":     bson.M{"$ne": CustomerStatusInactive},
	}

	// Use ORM to find customers
	result, err := r.ormRepo.FindAll(ctx, filter, pagination)
	if err != nil {
		r.logger.Error("Failed to get customers by company ID", map[string]interface{}{
			"error":      err.Error(),
			"company_id": companyID,
			"limit":      limit,
			"offset":     offset,
		})
		return nil, err
	}

	// Convert []Customer to []*Customer
	customers := make([]*Customer, len(result.Items))
	for i := range result.Items {
		customers[i] = &result.Items[i]
	}

	return customers, nil
}

// GetByCompanyIDs retrieves customers by multiple company IDs with pagination
func (r *customerRepository) GetByCompanyIDs(ctx context.Context, companyIDs []string, limit, offset int) ([]*Customer, error) {
	if len(companyIDs) == 0 {
		return nil, errors.New("no company IDs provided")
	}

	// Build pagination
	pagination := mongopkg.NewPaginationBuilder().
		Limit(limit).
		Skip(offset).
		SortDesc("created_at").
		Build()

	// Filter by company IDs and active status
	filter := bson.M{
		"company_ids": bson.M{"$in": companyIDs},
		"status":      bson.M{"$ne": CustomerStatusInactive},
	}

	// Use ORM to find customers
	result, err := r.ormRepo.FindAll(ctx, filter, pagination)
	if err != nil {
		r.logger.Error("Failed to get customers by multiple company IDs", map[string]interface{}{
			"error":       err.Error(),
			"company_ids": companyIDs,
			"limit":       limit,
			"offset":      offset,
		})
		return nil, err
	}

	// Convert []Customer to []*Customer
	customers := make([]*Customer, len(result.Items))
	for i := range result.Items {
		customers[i] = &result.Items[i]
	}

	return customers, nil
}

// Update updates a customer
func (r *customerRepository) Update(ctx context.Context, customer *Customer) error {
	// Set updated timestamp using Unix timestamp
	customer.SetUpdatedAt(time.Now().Unix())

	// Use ORM to update customer
	err := r.ormRepo.Update(ctx, customer)
	if err != nil {
		r.logger.Error("Failed to update customer", map[string]interface{}{
			"error":       err.Error(),
			"customer_id": customer.ID,
		})
		return err
	}

	r.logger.Info("Customer updated successfully", map[string]interface{}{
		"customer_id": customer.ID,
		"email":       customer.Email,
	})

	return nil
}

// Delete deletes a customer (soft delete by setting status to inactive)
func (r *customerRepository) Delete(ctx context.Context, id string) error {
	// Get customer first
	customer, err := r.GetByID(ctx, id)
	if err != nil {
		return err
	}

	// Update status to inactive
	customer.Status = CustomerStatusInactive
	customer.SetUpdatedAt(time.Now().Unix())

	// Update in database
	err = r.ormRepo.Update(ctx, customer)
	if err != nil {
		r.logger.Error("Failed to delete customer", map[string]interface{}{
			"error":       err.Error(),
			"customer_id": id,
		})
		return err
	}

	r.logger.Info("Customer deleted successfully", map[string]interface{}{
		"customer_id": id,
	})

	return nil
}

// List retrieves customers with pagination
func (r *customerRepository) List(ctx context.Context, limit, offset int) ([]*Customer, error) {
	// Build pagination
	pagination := mongopkg.NewPaginationBuilder().
		Limit(limit).
		Skip(offset).
		SortDesc("created_at").
		Build()

	// Only active customers by default
	filter := bson.M{"status": bson.M{"$ne": CustomerStatusInactive}}

	// Use ORM to find customers
	result, err := r.ormRepo.FindAll(ctx, filter, pagination)
	if err != nil {
		r.logger.Error("Failed to list customers", map[string]interface{}{
			"error":  err.Error(),
			"limit":  limit,
			"offset": offset,
		})
		return nil, err
	}

	// Convert []Customer to []*Customer
	customers := make([]*Customer, len(result.Items))
	for i := range result.Items {
		customers[i] = &result.Items[i]
	}

	return customers, nil
}

// Search retrieves customers with search and filters
func (r *customerRepository) Search(ctx context.Context, search string, customerType *string, status *string, companyID *string, industry *string, isVerified *bool, isCompliant *bool, language *string, currency *string, limit, offset int, sortBy, sortOrder string) ([]*Customer, error) {
	// Build filter
	filter := bson.M{}

	if search != "" {
		filter["$text"] = bson.M{"$search": search}
	}

	if customerType != nil {
		filter["type"] = *customerType
	}

	if status != nil {
		filter["status"] = *status
	}

	if companyID != nil {
		filter["company_id"] = *companyID
	}

	if industry != nil {
		filter["industry"] = *industry
	}

	if isVerified != nil {
		filter["is_verified"] = *isVerified
	}

	if isCompliant != nil {
		filter["is_compliant"] = *isCompliant
	}

	if language != nil {
		filter["language"] = *language
	}

	if currency != nil {
		filter["currency"] = *currency
	}

	// Build pagination
	pagination := mongopkg.NewPaginationBuilder().
		Limit(limit).
		Skip(offset)

	// Set sort
	if sortBy != "" {
		if sortOrder == "desc" {
			pagination.SortDesc(sortBy)
		} else {
			pagination.SortAsc(sortBy)
		}
	} else {
		pagination.SortDesc("created_at") // Default sort
	}

	// Use ORM to find customers
	result, err := r.ormRepo.FindAll(ctx, filter, pagination.Build())
	if err != nil {
		r.logger.Error("Failed to search customers", map[string]interface{}{
			"error":  err.Error(),
			"search": search,
		})
		return nil, err
	}

	// Convert []Customer to []*Customer
	customers := make([]*Customer, len(result.Items))
	for i := range result.Items {
		customers[i] = &result.Items[i]
	}

	return customers, nil
}

// CountByCompanyID counts customers by company ID
func (r *customerRepository) CountByCompanyID(ctx context.Context, companyID string) (int64, error) {
	filter := bson.M{
		"company_id": companyID,
		"status":     bson.M{"$ne": CustomerStatusInactive},
	}

	count, err := r.ormRepo.Count(ctx, filter)
	if err != nil {
		r.logger.Error("Failed to count customers by company ID", map[string]interface{}{
			"error":      err.Error(),
			"company_id": companyID,
		})
		return 0, err
	}

	return count, nil
}

// CountByCompanyIDs counts customers by multiple company IDs
func (r *customerRepository) CountByCompanyIDs(ctx context.Context, companyIDs []string) (int64, error) {
	if len(companyIDs) == 0 {
		return 0, errors.New("no company IDs provided")
	}

	filter := bson.M{
		"company_ids": bson.M{"$in": companyIDs},
		"status":      bson.M{"$ne": CustomerStatusInactive},
	}

	count, err := r.ormRepo.Count(ctx, filter)
	if err != nil {
		r.logger.Error("Failed to count customers by multiple company IDs", map[string]interface{}{
			"error":       err.Error(),
			"company_ids": companyIDs,
		})
		return 0, err
	}

	return count, nil
}

// CountByType counts customers by type
func (r *customerRepository) CountByType(ctx context.Context, customerType CustomerType) (int64, error) {
	filter := bson.M{
		"type":   customerType,
		"status": bson.M{"$ne": CustomerStatusInactive},
	}

	count, err := r.ormRepo.Count(ctx, filter)
	if err != nil {
		r.logger.Error("Failed to count customers by type", map[string]interface{}{
			"error":         err.Error(),
			"customer_type": customerType,
		})
		return 0, err
	}

	return count, nil
}

// CountByStatus counts customers by status
func (r *customerRepository) CountByStatus(ctx context.Context, status CustomerStatus) (int64, error) {
	filter := bson.M{"status": status}

	count, err := r.ormRepo.Count(ctx, filter)
	if err != nil {
		r.logger.Error("Failed to count customers by status", map[string]interface{}{
			"error":  err.Error(),
			"status": status,
		})
		return 0, err
	}

	return count, nil
}

// UpdateStatus updates customer status
func (r *customerRepository) UpdateStatus(ctx context.Context, id string, status CustomerStatus) error {
	// Get customer first
	customer, err := r.GetByID(ctx, id)
	if err != nil {
		return err
	}

	// Update status
	customer.Status = status
	customer.SetUpdatedAt(time.Now().Unix())

	// Update in database
	err = r.ormRepo.Update(ctx, customer)
	if err != nil {
		r.logger.Error("Failed to update customer status", map[string]interface{}{
			"error":       err.Error(),
			"customer_id": id,
			"status":      status,
		})
		return err
	}

	r.logger.Info("Customer status updated successfully", map[string]interface{}{
		"customer_id": id,
		"status":      status,
	})

	return nil
}

// UpdateVerification updates customer verification status
func (r *customerRepository) UpdateVerification(ctx context.Context, id string, isVerified, isCompliant bool, complianceNotes *string) error {
	// Get customer first
	customer, err := r.GetByID(ctx, id)
	if err != nil {
		return err
	}

	// Update verification fields
	customer.IsVerified = isVerified
	customer.IsCompliant = isCompliant
	customer.ComplianceNotes = complianceNotes
	customer.SetUpdatedAt(time.Now().Unix())

	// Update in database
	err = r.ormRepo.Update(ctx, customer)
	if err != nil {
		r.logger.Error("Failed to update customer verification", map[string]interface{}{
			"error":       err.Error(),
			"customer_id": id,
		})
		return err
	}

	r.logger.Info("Customer verification updated successfully", map[string]interface{}{
		"customer_id":  id,
		"is_verified":  isVerified,
		"is_compliant": isCompliant,
	})

	return nil
}