using System;
using System.Globalization;
using System.Threading.Tasks;
using FarmmapsApi.Models;
using FarmmapsApi.Services;
using FarmmapsNbs.Models;
using Microsoft.Extensions.Logging;
using static FarmmapsApi.Extensions;
using static FarmmapsApiSamples.Constants;

namespace FarmmapsNbs
{
    public class NitrogenService
    {
        private readonly ILogger<NitrogenService> _logger;
        private readonly FarmmapsApiService _farmmapsApiService;
        private readonly GeneralService _generalService;

        public NitrogenService(ILogger<NitrogenService> logger, FarmmapsApiService farmmapsApiService,
            GeneralService generalService)
        {
            _logger = logger;
            _farmmapsApiService = farmmapsApiService;
            _generalService = generalService;
        }

        public async Task<Item> CreateTargetNItem(Item cropfieldItem)
        {
            var itemRequest = new ItemRequest()
            {
                ParentCode = cropfieldItem.ParentCode,
                ItemType = USERINPUT_ITEMTYPE,
                Name = "TargetN"
            };
            return await _farmmapsApiService.CreateItemAsync(itemRequest);
        }

        /// <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="targetNItem">The targetN item to save calculations in</param>
        /// <param name="plantingDate">The date the crop is planted</param>
        /// <param name="measurementDate">The date the measurements are taken</param>
        /// <param name="purposeType">The crop purpose</param>
        /// <param name="targetYield">The target yield input for the TargetN calculation</param>
        /// <returns>The TargetN</returns>
        public async Task<TargetNData> CalculateTargetN(Item cropfieldItem, Item targetNItem, DateTime plantingDate, 
            DateTime measurementDate, string purposeType, int targetYield)
        {
            var nbsTargetNRequest = new TaskRequest {TaskType = VRANBS_TASK};
            nbsTargetNRequest.attributes["operation"] = "targetn";
            nbsTargetNRequest.attributes["inputCode"] = targetNItem.Code;
            nbsTargetNRequest.attributes["plantingDate"] = plantingDate.ToString("o");
            nbsTargetNRequest.attributes["measurementDate"] = measurementDate.ToString("o");
            nbsTargetNRequest.attributes["purposeType"] = purposeType.ToLower();
            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.IsFinished)
                    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 item = await _farmmapsApiService.GetItemAsync(targetNItem.Code);
            return item.Data.ToObject<TargetNData>();
        }

        /// <summary>
        /// Calculates the uptake map based on the given inputs
        /// </summary>
        /// <param name="cropfieldItem">The cropfield to base the calculations on</param>
        /// <param name="inputItem"></param>
        /// <param name="plantingDate">The date the crop is planted</param>
        /// <param name="measurementDate">The date the measurements are taken</param>
        /// <param name="inputType">Data type, could be yara, ci, irmi or wdvi</param>
        /// <param name="inputLayerName">Column name in which the sensor value is stored</param>
        /// <returns></returns>
        public async Task<Item> CalculateUptakeMap(Item cropfieldItem, Item inputItem, DateTime plantingDate, 
            DateTime measurementDate, string inputType, string inputLayerName)
        {
            var nbsUptakeMapRequest = new TaskRequest {TaskType = VRANBS_TASK};
            nbsUptakeMapRequest.attributes["operation"] = "uptake";
            nbsUptakeMapRequest.attributes["inputCode"] = inputItem.Code;
            nbsUptakeMapRequest.attributes["plantingDate"] = plantingDate.ToString("o");
            nbsUptakeMapRequest.attributes["measurementDate"] = measurementDate.ToString("o");
            nbsUptakeMapRequest.attributes["inputType"] = inputType.ToLower();
            if (!(string.IsNullOrEmpty(inputLayerName))) nbsUptakeMapRequest.attributes["inputLayerName"] = inputLayerName;
            //toevoeging FS. Kolom IRMI hernoemd als IMI. Deze wordt niet automatisch herkend. En moet dus gespecificeerd worden.



            string itemTaskCode = await _farmmapsApiService.QueueTaskAsync(cropfieldItem.Code, nbsUptakeMapRequest);
            
            await PollTask(TimeSpan.FromSeconds(5), async (tokenSource) =>
            {
                var itemTaskStatus = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
                _logger.LogInformation($"Calculating uptake map; status: {itemTaskStatus.State}");
                if (itemTaskStatus.IsFinished)
                    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 itemName = "VRANbs uptake";
            var uptakeMapItem = await _generalService.FindChildItemAsync(cropfieldItem.Code,
                GEOTIFF_PROCESSED_ITEMTYPE, itemName,
                i => i.Updated >= itemTask.Finished.GetValueOrDefault(DateTime.UtcNow) &&
                i.Name.ToLower().Contains(itemName.ToLower()));

            if (uptakeMapItem == null)
            {
                _logger.LogError("Could not find the uptake geotiff child item under cropfield");
                return null;
            }

            return uptakeMapItem;
        }


        /// <summary>
        /// Creates the nitrogen application map based on given input data
        /// </summary>
        /// <param name="cropfieldItem">The cropfield to base the calculations on</param>
        /// <param name="inputItem">The farmmaps item containing the geotiff data</param>
        /// <param name="plantingDate">The date the crop is planted</param>
        /// <param name="measurementDate">The date the measurements are taken</param>
        /// <param name="inputType">The inputtype to use, could be yara, ci, irmi or wdvi</param>
        /// <param name="targetN">The target nitrogen to use for the calculations</param>
        /// <returns></returns>
        public async Task<Item> CalculateApplicationMap(Item cropfieldItem, Item inputItem, DateTime plantingDate, 
            DateTime measurementDate, string inputType, double targetN, string inputLayerName)
        {
            var nbsApplicationMapRequest = new TaskRequest {TaskType = VRANBS_TASK};
            nbsApplicationMapRequest.attributes["operation"] = "application";
            nbsApplicationMapRequest.attributes["inputCode"] = inputItem.Code;
            nbsApplicationMapRequest.attributes["plantingDate"] = plantingDate.ToString("o");
            nbsApplicationMapRequest.attributes["measurementDate"] = measurementDate.ToString("o");
            nbsApplicationMapRequest.attributes["inputCode"] = inputItem.Code;
            nbsApplicationMapRequest.attributes["inputType"] = inputType.ToLower();
            nbsApplicationMapRequest.attributes["targetN"] = targetN.ToString(CultureInfo.InvariantCulture);
            if (!(string.IsNullOrEmpty(inputLayerName))) nbsApplicationMapRequest.attributes["inputLayerName"] = inputLayerName;
           
            string itemTaskCode = await _farmmapsApiService.QueueTaskAsync(cropfieldItem.Code, nbsApplicationMapRequest);

            await PollTask(TimeSpan.FromSeconds(5), async (tokenSource) =>
            {
                var itemTaskStatus = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
                _logger.LogInformation($"Calculating application map; status: {itemTaskStatus.State}");
                if (itemTaskStatus.IsFinished)
                    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 itemName = $"VRANbs application";
            var applicationMapItem = await _generalService.FindChildItemAsync(cropfieldItem.Code,
                GEOTIFF_PROCESSED_ITEMTYPE, itemName,
                i => i.Updated >= itemTask.Finished.GetValueOrDefault(DateTime.UtcNow) &&
                     i.Name.ToLower().Contains(itemName.ToLower()));
            if (applicationMapItem == null)
            {
                _logger.LogError("Could not find the application map geotiff child item under cropfield");
                return null;
            }

            return applicationMapItem;
        }
    }
}