NAM-APJATEL-BACKEND/utils/helper/nearest_device_helper.go

package helper

import (
    "fmt"
    "log"
    "math"
    "users_management/m/model/dto/res"
    "users_management/m/model/entity"
    "users_management/m/repository"
    "users_management/m/utils/service"
    
    "github.com/google/uuid"
)

func ConvertToNearestDeviceResponses(devices []entity.DeviceWithDistance, repo repository.NearestDeviceRepo, geocoder service.GeocodingService) ([]res.NearestDeviceResponse, error) {
    var responses []res.NearestDeviceResponse
    
    for _, device := range devices {
        // Get address
        address := ""
        if geocoder != nil {
            addr, err := geocoder.GetAddressFromCoordinates(device.Latitude, device.Longitude)
            if err != nil {
                log.Printf("Geocoding error for device %s: %v", device.DeviceCode, err)
                address = fmt.Sprintf("Coordinates: %.6f, %.6f", device.Latitude, device.Longitude)
            } else {
                address = addr
            }
        }
        
        // Count connections
        backboneCount, fishboneCount, towerCount, err := repo.CountConnectionsByDeviceID(device.ID)
        if err != nil {
            log.Printf("Error counting connections for device %s: %v", device.DeviceCode, err)
            backboneCount, fishboneCount, towerCount = 0, 0, 0
        }
        
        response := res.NearestDeviceResponse{
            ID:           device.ID,
            DeviceCode:   device.DeviceCode,
            DeviceType:   string(device.DeviceType),
            Distance:     device.Distance, // Use the calculated distance from query
            Address:      address,
            Longitude:    device.Longitude,
            Latitude:     device.Latitude,
            Status:       string(device.Status),
            PortAmount:   device.PortAmount,
            Region:       device.Region,
            Province:     device.Province,
            City:         device.City,
            District:     device.District,
            BackboneCount: backboneCount,
            FishboneCount: fishboneCount,
            TowerCount:   towerCount,
            CreatedAt:    device.CreatedAt,
        }
        
        responses = append(responses, response)
    }
    
    return responses, nil
}

func ConvertToNearestDeviceDetailResponse(device entity.Device, distance float64, repo repository.NearestDeviceRepo, geocoder service.GeocodingService) (res.NearestDeviceDetailResponse, error) {
    // Get address
    address := ""
    if geocoder != nil {
        addr, err := geocoder.GetAddressFromCoordinates(device.Latitude, device.Longitude)
        if err != nil {
            log.Printf("Geocoding error for device %s: %v", device.DeviceCode, err)
            address = fmt.Sprintf("Coordinates: %.6f, %.6f", device.Latitude, device.Longitude)
        } else {
            address = addr
        }
    }
    
    // Get detailed connection information
    backbones, err := repo.GetBackbonesByDeviceID(device.ID)
    if err != nil {
        return res.NearestDeviceDetailResponse{}, err
    }
    
    fishbones, err := repo.GetFishbonesByDeviceID(device.ID)
    if err != nil {
        return res.NearestDeviceDetailResponse{}, err
    }
    
    towers, err := repo.GetTowersByDeviceID(device.ID)
    if err != nil {
        return res.NearestDeviceDetailResponse{}, err
    }
    
    // Convert to response format
    backboneInfos := convertToBackboneConnectionInfos(backbones, device.ID)
    fishboneInfos := convertToFishboneConnectionInfos(fishbones, device.ID)
    towerInfos := convertToTowerConnectionInfos(towers, device.Latitude, device.Longitude)
    
    response := res.NearestDeviceDetailResponse{
        ID:           device.ID,
        DeviceCode:   device.DeviceCode,
        DeviceType:   string(device.DeviceType),
        Distance:     distance,
        Address:      address,
        Longitude:    device.Longitude,
        Latitude:     device.Latitude,
        Status:       string(device.Status),
        PortAmount:   device.PortAmount,
        Province:     device.Province,
        City:         device.City,
        District:     device.District,
        ImageURL:     device.ImageURL,
        Backbones:    backboneInfos,
        Fishbones:    fishboneInfos,
        Towers:       towerInfos,
        CreatedAt:    device.CreatedAt,
        UpdatedAt:    device.UpdatedAt,
    }
    
    return response, nil
}

func convertToBackboneConnectionInfos(backbones []entity.Backbone, deviceID uuid.UUID) []res.BackboneConnectionInfo {
    var infos []res.BackboneConnectionInfo
    
    for _, backbone := range backbones {
        isStartDevice := backbone.DeviceStartID == deviceID
        connectedTo := ""
        
        if isStartDevice && backbone.DeviceEnd.DeviceCode != "" {
            connectedTo = backbone.DeviceEnd.DeviceCode
        } else if !isStartDevice && backbone.DeviceStart.DeviceCode != "" {
            connectedTo = backbone.DeviceStart.DeviceCode
        }
        
        info := res.BackboneConnectionInfo{
            ID:           backbone.ID,
            BackboneCode: backbone.BackboneCode,
            CoreAmount:   backbone.CoreAmount,
            IsStartDevice: isStartDevice,
            ConnectedTo:  connectedTo,
        }
        
        infos = append(infos, info)
    }
    
    return infos
}

func convertToFishboneConnectionInfos(fishbones []entity.Fishbone, deviceID uuid.UUID) []res.FishboneConnectionInfo {
    var infos []res.FishboneConnectionInfo
    
    for _, fishbone := range fishbones {
        isStartDevice := fishbone.DeviceStartID == deviceID
        connectedTo := ""
        
        if isStartDevice && fishbone.DeviceEnd.DeviceCode != "" {
            connectedTo = fishbone.DeviceEnd.DeviceCode
        } else if !isStartDevice && fishbone.DeviceStart.DeviceCode != "" {
            connectedTo = fishbone.DeviceStart.DeviceCode
        }
        
        info := res.FishboneConnectionInfo{
            ID:           fishbone.ID,
            FishboneCode: fishbone.FishboneCode,
            CoreAmount:   fishbone.CoreAmount,
            BackboneCode: fishbone.Backbone.BackboneCode,
            IsStartDevice: isStartDevice,
            ConnectedTo:  connectedTo,
        }
        
        infos = append(infos, info)
    }
    
    return infos
}

func convertToTowerConnectionInfos(towers []entity.Tower, deviceLat, deviceLng float64) []res.TowerConnectionInfo {
    var infos []res.TowerConnectionInfo
    
    for _, tower := range towers {
        // Calculate distance from device to tower
        distance := calculateDistance(deviceLat, deviceLng, tower.Latitude, tower.Longitude)
        
        info := res.TowerConnectionInfo{
            ID:        tower.ID,
            TowerCode: tower.TowerCode,
            Distance:  distance,
            ImageURL:  &tower.ImageURL,
        }
        
        infos = append(infos, info)
    }
    
    return infos
}

func calculateDistance(lat1, lng1, lat2, lng2 float64) float64 {
    const earthRadius = 6371 // Earth's radius in kilometers
    
    lat1Rad := lat1 * math.Pi / 180
    lng1Rad := lng1 * math.Pi / 180
    lat2Rad := lat2 * math.Pi / 180
    lng2Rad := lng2 * math.Pi / 180
    
    dlat := lat2Rad - lat1Rad
    dlng := lng2Rad - lng1Rad
    
    a := math.Sin(dlat/2)*math.Sin(dlat/2) + math.Cos(lat1Rad)*math.Cos(lat2Rad)*math.Sin(dlng/2)*math.Sin(dlng/2)
    c := 2 * math.Atan2(math.Sqrt(a), math.Sqrt(1-a))
    
    return earthRadius * c
}