package repository

import (
	"context"

	"bugulma/backend/internal/domain"

	"bugulma/backend/internal/geospatial"

	"gorm.io/gorm"
)

// AddressRepository implements domain.AddressRepository with GORM
type AddressRepository struct {
	*BaseRepository[domain.Address]
}

// NewAddressRepository creates a new GORM-based address repository
func NewAddressRepository(db *gorm.DB) domain.AddressRepository {
	return &AddressRepository{
		BaseRepository: NewBaseRepository[domain.Address](db),
	}
}

// GetByID retrieves an address by ID with preloaded associations
func (r *AddressRepository) GetByID(ctx context.Context, id string) (*domain.Address, error) {
	var address domain.Address
	err := r.DB().WithContext(ctx).
		Preload("Organizations").
		Preload("Sites").
		First(&address, "id = ?", id).Error
	if err != nil {
		return nil, handleError(err)
	}
	return &address, nil
}

// GetAll retrieves all addresses with preloaded associations
func (r *AddressRepository) GetAll(ctx context.Context) ([]*domain.Address, error) {
	var addresses []*domain.Address
	err := r.DB().WithContext(ctx).
		Preload("Organizations").
		Preload("Sites").
		Find(&addresses).Error
	return addresses, err
}

// GetWithinRadius retrieves addresses within a geographic radius
func (r *AddressRepository) GetWithinRadius(ctx context.Context, lat, lng, radiusKm float64) ([]*domain.Address, error) {
	dialector := r.DB().Dialector.Name()

	var addresses []*domain.Address

	if dialector == "postgres" {
		// Use PostGIS for PostgreSQL
		geo := geospatial.NewGeoHelper(r.DB())
		query := `
			SELECT * FROM addresses
			WHERE latitude IS NOT NULL AND longitude IS NOT NULL
			AND ` + geo.DWithinExpr("ST_SetSRID(ST_MakePoint(longitude, latitude), 4326)") + `
			ORDER BY ST_Distance(
				ST_SetSRID(ST_MakePoint(longitude, latitude), 4326)::geography,
				` + geo.PointExpr() + `::geography
			)
		`
		// Use includeOrderBy=true so PointRadiusArgs returns args in the order
		// [lng, lat, radiusKm, lng, lat] matching DWithin + ORDER BY placeholders
		args := geo.PointRadiusArgs(lng, lat, radiusKm, true)
		result := r.DB().WithContext(ctx).Raw(query, args...).Scan(&addresses)
		if result.Error != nil {
			return nil, result.Error
		}
	} else {
		// Fallback to bounding box for non-PostgreSQL databases
		query := `
			SELECT * FROM addresses
			WHERE latitude IS NOT NULL AND longitude IS NOT NULL
			AND abs(latitude - ?) <= 0.09
			AND abs(longitude - ?) <= 0.15
		`
		result := r.DB().WithContext(ctx).Raw(query, lat, lng).Scan(&addresses)
		if result.Error != nil {
			return nil, result.Error
		}
	}

	return addresses, nil
}

// GetByOrganizationID retrieves all addresses for a specific organization
func (r *AddressRepository) GetByOrganizationID(ctx context.Context, orgID string) ([]*domain.Address, error) {
	var addresses []*domain.Address

	err := r.DB().WithContext(ctx).
		Joins("JOIN organization_addresses ON organization_addresses.address_id = addresses.id").
		Where("organization_addresses.organization_id = ?", orgID).
		Find(&addresses).Error

	return addresses, err
}

// GetBySiteID retrieves all addresses for a specific site
func (r *AddressRepository) GetBySiteID(ctx context.Context, siteID string) ([]*domain.Address, error) {
	var addresses []*domain.Address

	err := r.DB().WithContext(ctx).
		Joins("JOIN site_addresses ON site_addresses.address_id = addresses.id").
		Where("site_addresses.site_id = ?", siteID).
		Find(&addresses).Error

	return addresses, err
}

// FindOrCreate finds an existing address or creates a new one (deduplication)
func (r *AddressRepository) FindOrCreate(ctx context.Context, address *domain.Address) (*domain.Address, error) {
	var existing domain.Address

	// Try to find existing address by formatted address or coordinates
	err := r.DB().WithContext(ctx).
		Where("formatted_ru = ? OR (latitude = ? AND longitude = ?)",
			address.FormattedRu, address.Latitude, address.Longitude).
		First(&existing).Error

	if err == nil {
		// Found existing address
		return &existing, nil
	}

	if err == gorm.ErrRecordNotFound {
		// Address doesn't exist, create it
		if err := r.DB().WithContext(ctx).Create(address).Error; err != nil {
			return nil, handleError(err)
		}
		return address, nil
	}

	// Actual error occurred
	return nil, handleError(err)
}