FarmMapsApiClient/FarmmapsApiSamples/NbsApp.cs

using System;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using FarmmapsApi.Models;
using FarmmapsApi.Services;
using Google.Apis.Upload;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json.Linq;
using static FarmmapsApi.Extensions;

namespace FarmmapsApiSamples
{
    public class NbsApp : IApp
    {
        private const string USERINPUT_ITEMTYPE = "vnd.farmmaps.itemtype.user.input";
        private const string GEOTIFF_ITEMTYPE = "vnd.farmmaps.itemtype.geotiff";
        private const string CROPFIELD_ITEMTYPE = "vnd.farmmaps.itemtype.cropfield";
        private const string VRANBS_TASK = "vnd.farmmaps.task.vranbs";
        
        private readonly ILogger<NbsApp> _logger;
        private readonly FarmmapsApiService _farmmapsApiService;

        public NbsApp(ILogger<NbsApp> logger, FarmmapsApiService farmmapsApiService)
        {
            _logger = logger;
            _farmmapsApiService = farmmapsApiService;

            farmmapsApiService.EventCallback += OnEvent;
        }

        private void OnEvent(EventMessage @event)
        {
            _logger.LogInformation(@event.EventType);
        }

        public async Task RunAsync()
        {
            try
            {
                _logger.LogInformation("NBS sample app started");
                
                await _farmmapsApiService.AuthenticateAsync();

                _logger.LogInformation("Authenticated client credentials");

                var roots = await _farmmapsApiService.GetCurrentUserRootsAsync();
                
                // upload data to Uploaded
                var uploadedRoot = roots.SingleOrDefault(r => r.Name == "Uploaded");
                if (uploadedRoot != null)
                {
                    await _farmmapsApiService.UploadFile(Path.Combine("Data", "Scan_1_20190605.zip"), uploadedRoot.Code,
                        progress =>
                        {
                            _logger.LogInformation($"Status: {progress.Status} - BytesSent: {progress.BytesSent}");
                            if(progress.Status == UploadStatus.Failed)
                                _logger.LogError($"Uploading failed {progress.Exception.Message}");
                        });
                    
                    // need to transform shape data to geotiff

                    var myDriveRoot = roots.SingleOrDefault(r => r.Name == "My drive");
                    if (myDriveRoot != null)
                    {
                        var cropfieldItem = await GetOrCreateCropfieldItem(myDriveRoot.Code);
                    
                        _logger.LogInformation($"Calculating targetN with targetYield: {60}");
                        var targetN = await CalculateTargetN(cropfieldItem, 60);
                        _logger.LogInformation($"TargetN: {targetN}");
                    
                        _logger.LogInformation("Calculating nitrogen map");
//                    var nitrogenMapItem = CalculateNitrogenMap(cropfieldItem,, targetN);
                    }
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex.Message);
            }
        }

        private async Task<Item> GetOrCreateCropfieldItem(string parentItemCode)
        {
            var cropfieldItems = await
                _farmmapsApiService.GetItemChildrenAsync(parentItemCode,CROPFIELD_ITEMTYPE);

            if (cropfieldItems.Count > 0) 
                return cropfieldItems[0];

            var currentYear = new DateTime(DateTime.UtcNow.Year, 1, 1);
            var cropfieldItemRequest = new ItemRequest()
            {
                ParentCode = parentItemCode,
                ItemType = "vnd.farmmaps.itemtype.cropfield",
                Name = "Cropfield for VRA",
                DataDate = currentYear,
                DataEndDate = currentYear.AddYears(1),
                Data = JObject.FromObject(new
                    {startDate = currentYear, endDate = currentYear.AddMonths(3)}),
                Geometry = JObject.Parse(
                    @"{ ""type"": ""Polygon"", ""coordinates"": [ [ [ 3.40843828875524, 50.638966444680605 ], [ 3.408953272886064, 50.639197789621612 ], [ 3.409242951459603, 50.639469958681836 ], [ 3.409328782148028, 50.639612846807708 ], [ 3.409457528180712, 50.639789755314411 ], [ 3.409639918393741, 50.640014292074966 ], [ 3.409833037442765, 50.640211611372706 ], [ 3.410069071836049, 50.640395321698435 ], [ 3.410380208081761, 50.640572227259661 ], [ 3.410605513638958, 50.640715112034222 ], [ 3.411925160474145, 50.641177783561204 ], [ 3.411935889310142, 50.640728720085136 ], [ 3.412590348309737, 50.63948356709389 ], [ 3.413244807309242, 50.638224772339846 ], [ 3.413400375432099, 50.637901562841307 ], [ 3.413539850300779, 50.637449065809889 ], [ 3.413475477284437, 50.637418445552932 ], [ 3.40999396998362, 50.637449065810451 ], [ 3.409940325803365, 50.638102293212661 ], [ 3.409575545377398, 50.638483338338325 ], [ 3.409060561246574, 50.638707881340494 ], [ 3.40843828875524, 50.638966444680605 ] ] ] }")
            };

            return await _farmmapsApiService.CreateItemAsync(cropfieldItemRequest);
        }

        /// <summary>
        /// Calculates TargetN, makes the assumption the cropfield and user.input(targetn) item have the same parent
        /// </summary>
        /// <param name="cropfieldItem">The cropfield to base the calculations on</param>
        /// <param name="targetYield">The target yield input for the TargetN calculation</param>
        /// <returns>The TargetN</returns>
        private async Task<double> CalculateTargetN(Item cropfieldItem, int targetYield)
        {
            var targetNItems = await
                _farmmapsApiService.GetItemChildrenAsync(cropfieldItem.ParentCode, USERINPUT_ITEMTYPE);

            Item targetNItem;
            if (targetNItems.Count == 0)
            {
                _logger.LogInformation("Creating targetN item");
                var itemRequest = CreateTargetNItemRequest(cropfieldItem.ParentCode);
                targetNItem = await _farmmapsApiService.CreateItemAsync(itemRequest);
            }
            else
            {
                targetNItem = targetNItems[0];
            }

            var nbsTargetNRequest = new TaskRequest {TaskType = VRANBS_TASK};
            nbsTargetNRequest.attributes["operation"] = "targetn";
            nbsTargetNRequest.attributes["inputCode"] = targetNItem.Code;
            nbsTargetNRequest.attributes["inputType"] = "irmi";
            nbsTargetNRequest.attributes["purposeType"] = "consumption";
            nbsTargetNRequest.attributes["targetYield"] = targetYield.ToString();
            string itemTaskCode = await _farmmapsApiService.QueueTaskAsync(cropfieldItem.Code, nbsTargetNRequest);
            
            await PollTask(TimeSpan.FromSeconds(3), async (tokenSource) =>
            {
                var itemTaskStatus = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
                if (itemTaskStatus.State != ItemTaskState.Processing && itemTaskStatus.State != ItemTaskState.Scheduled)
                    tokenSource.Cancel();
            });

            var itemTask = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
            if(itemTask.State == ItemTaskState.Error)
            {
                _logger.LogError($"Something went wrong with task execution: {itemTask.Message}");
                return 0;
            }
            
            var item = await _farmmapsApiService.GetItemAsync(targetNItem.Code);
            if (item.Data.ContainsKey("TargetN"))
                return item.Data["TargetN"].Value<double>();

            return 0;
        }

        private async Task<Item> CalculateNitrogenMap(Item cropfieldItem, Item inputItem, double targetN)
        {
            var nbsNitrogenRequest = new TaskRequest {TaskType = VRANBS_TASK};
            nbsNitrogenRequest.attributes["operation"] = "nitrogen";
            nbsNitrogenRequest.attributes["inputCode"] = inputItem.Code;
            nbsNitrogenRequest.attributes["inputType"] = "irmi";
            nbsNitrogenRequest.attributes["targetN"] = targetN.ToString(CultureInfo.InvariantCulture);
            
            string itemTaskCode = await _farmmapsApiService.QueueTaskAsync(cropfieldItem.Code, nbsNitrogenRequest);
            
            await PollTask(TimeSpan.FromSeconds(5), async (tokenSource) =>
            {
                var itemTaskStatus = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
                if (itemTaskStatus.State != ItemTaskState.Processing && itemTaskStatus.State != ItemTaskState.Scheduled)
                    tokenSource.Cancel();
            });
            
            var itemTask = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
            if(itemTask.State == ItemTaskState.Error)
            {
                _logger.LogError($"Something went wrong with task execution: {itemTask.Message}");
                return null;
            }
            
            var geotiffItems = await
                _farmmapsApiService.GetItemChildrenAsync(cropfieldItem.Code, GEOTIFF_ITEMTYPE);

            // how to uniquely know which item is really created!?
            var nitrogenItem = geotiffItems.SingleOrDefault(i => i.Name.Contains("nitrogen"));
            if (nitrogenItem == null)
            {
                _logger.LogError("Could not find the nitrogen geotiff child item under cropfield");
                return null;
            }

            return nitrogenItem;
        }

        private ItemRequest CreateTargetNItemRequest(string parentItemCode)
        {
            return new ItemRequest()
            {
                ParentCode = parentItemCode,
                ItemType = USERINPUT_ITEMTYPE,
                Name = "TargetN",
                DataDate = DateTime.UtcNow
            };
        }
    }
}