package repository

import (
	"context"

	"bugulma/backend/internal/domain"

	"gorm.io/gorm"
)

// ResourceFlowRepository implements domain.ResourceFlowRepository with GORM
type ResourceFlowRepository struct {
	*BaseRepository[domain.ResourceFlow]
}

// NewResourceFlowRepository creates a new GORM-based resource flow repository
func NewResourceFlowRepository(db *gorm.DB) domain.ResourceFlowRepository {
	return &ResourceFlowRepository{
		BaseRepository: NewBaseRepository[domain.ResourceFlow](db),
	}
}

// GetBySiteID retrieves resource flows at a specific site
func (r *ResourceFlowRepository) GetBySiteID(ctx context.Context, siteID string) ([]*domain.ResourceFlow, error) {
	return r.FindWhereWithContext(ctx, "site_id = ?", siteID)
}

// GetByOrganizationID retrieves resource flows owned by a specific organization
func (r *ResourceFlowRepository) GetByOrganizationID(ctx context.Context, organizationID string) ([]*domain.ResourceFlow, error) {
	return r.FindWhereWithContext(ctx, "organization_id = ?", organizationID)
}

// GetByTypeAndDirection retrieves resource flows by type and direction
func (r *ResourceFlowRepository) GetByTypeAndDirection(ctx context.Context, resType domain.ResourceType, direction domain.ResourceDirection) ([]*domain.ResourceFlow, error) {
	return r.FindWhereWithContext(ctx, "type = ? AND direction = ?", resType, direction)
}

// GetOutputsInRadius retrieves output resource flows within a geographic radius
func (r *ResourceFlowRepository) GetOutputsInRadius(ctx context.Context, lat, lng, radiusKm float64, resType domain.ResourceType) ([]*domain.ResourceFlow, error) {
	var flows []*domain.ResourceFlow
	dialector := r.DB().Dialector.Name()

	if dialector == "postgres" {
		query := `
			SELECT rf.* FROM resource_flows rf
			JOIN sites s ON rf.site_id = s.id
			WHERE rf.direction = 'output'
			AND rf.type = ?
			AND s.latitude IS NOT NULL AND s.longitude IS NOT NULL
			AND (
				6371 * acos(
					cos(radians(?)) * cos(radians(s.latitude)) *
					cos(radians(s.longitude) - radians(?)) +
					sin(radians(?)) * sin(radians(s.latitude))
				)
			) <= ?
		`
		result := r.DB().WithContext(ctx).Raw(query, resType, lat, lng, lat, radiusKm).Scan(&flows)
		if result.Error != nil {
			return nil, result.Error
		}
	} else {
		// Fallback to simple bounding box for SQLite
		query := `
			SELECT rf.* FROM resource_flows rf
			JOIN sites s ON rf.site_id = s.id
			WHERE rf.direction = 'output'
			AND rf.type = ?
			AND s.latitude IS NOT NULL AND s.longitude IS NOT NULL
			AND abs(s.latitude - ?) <= 0.09
			AND abs(s.longitude - ?) <= 0.15
		`
		result := r.DB().WithContext(ctx).Raw(query, resType, lat, lng).Scan(&flows)
		if result.Error != nil {
			return nil, result.Error
		}
	}
	return flows, nil
}

// GetInputsInRadius retrieves input resource flows within a geographic radius
func (r *ResourceFlowRepository) GetInputsInRadius(ctx context.Context, lat, lng, radiusKm float64, resType domain.ResourceType) ([]*domain.ResourceFlow, error) {
	var flows []*domain.ResourceFlow
	dialector := r.DB().Dialector.Name()

	if dialector == "postgres" {
		query := `
			SELECT rf.* FROM resource_flows rf
			JOIN sites s ON rf.site_id = s.id
			WHERE rf.direction = 'input'
			AND rf.type = ?
			AND s.latitude IS NOT NULL AND s.longitude IS NOT NULL
			AND (
				6371 * acos(
					cos(radians(?)) * cos(radians(s.latitude)) *
					cos(radians(s.longitude) - radians(?)) +
					sin(radians(?)) * sin(radians(s.latitude))
				)
			) <= ?
		`
		result := r.DB().WithContext(ctx).Raw(query, resType, lat, lng, lat, radiusKm).Scan(&flows)
		if result.Error != nil {
			return nil, result.Error
		}
	} else {
		// Fallback to simple bounding box for SQLite
		query := `
			SELECT rf.* FROM resource_flows rf
			JOIN sites s ON rf.site_id = s.id
			WHERE rf.direction = 'input'
			AND rf.type = ?
			AND s.latitude IS NOT NULL AND s.longitude IS NOT NULL
			AND abs(s.latitude - ?) <= 0.09
			AND abs(s.longitude - ?) <= 0.15
		`
		result := r.DB().WithContext(ctx).Raw(query, resType, lat, lng).Scan(&flows)
		if result.Error != nil {
			return nil, result.Error
		}
	}
	return flows, nil
}