FarmMapsApiClient/FarmmapsApiSamples/NbsApp.cs

using System;
using System.Linq;
using System.Threading.Tasks;
using FarmmapsApi.Models;
using FarmmapsApi.Services;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json.Linq;

namespace FarmmapsApiSamples
{
    public class NbsApp : IApp
    {
        private const string USERINPUT_ITEMTYPE = "vnd.farmmaps.itemtype.user.input";
        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();
                var myDriveRoot = roots.SingleOrDefault(r => r.Name == "My drive");

                if (myDriveRoot != null)
                {
                    // create or get a cropfield
                    var cropfieldItem = await GetCreateCropfieldItem(myDriveRoot.Code);
                        
                    // create or get target n item

                    var targetNItems = await
                        _farmmapsApiService.GetItemChildrenAsync(myDriveRoot.Code, USERINPUT_ITEMTYPE);

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

                    await CalculateTargetN(cropfieldItem, targetNItem, 60);


                    await Task.Delay(2000);
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex.Message);
            }
        }

        private async Task<Item> GetCreateCropfieldItem(string parentItemCode)
        {
            var cropfieldItems = await
                _farmmapsApiService.GetItemChildrenAsync(parentItemCode, "vnd.farmmaps.itemtype.cropfield");

            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.AddYears(1)}),
                Geometry = JObject.Parse(
                    @"{""type"":""Polygon"",""coordinates"":[[[6.09942873984307,53.070025028087],[6.09992507404607,53.0705617890585],[6.10036959220086,53.0710679529031],[6.10065149010421,53.0714062774307],[6.10087493644271,53.0716712354474],[6.10091082982487,53.0716936039203],[6.10165087441291,53.0712041549161],[6.10204994718318,53.0709349338005],[6.10263143118855,53.0705789370018],[6.10311578125011,53.0702657538294],[6.10331686552072,53.0701314102389],[6.103326530575,53.070119463569],[6.10309137950343,53.0699829669055],[6.10184241586523,53.0692902201371],[6.10168497998891,53.0691984306747],[6.10092987659869,53.0694894453514],[6.09942873984307,53.070025028087]]]}")
            };

            return await _farmmapsApiService.CreateItemAsync(cropfieldItemRequest);
        }

        private async Task<Item> CalculateTargetN(Item cropfieldItem, Item targetNItem, int targetYield)
        {
            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);
            
            // poll task
            
            // get target N item again

            return targetNItem;
        }

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