using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using FarmmapsApi;
using FarmmapsApi.Models;
using FarmmapsApi.Services;
using FarmmapsNbs.Models;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using static FarmmapsApiSamples.Constants;

namespace FarmmapsNbs
{
    public class NbsApplication : IApplication
    {
        private const string DownloadFolder = "Downloads";
        private const string SettingsFile = "settings.json";

        private readonly ILogger<NbsApplication> _logger;
        private readonly FarmmapsApiService _farmmapsApiService;
        private readonly NitrogenService _nitrogenService;
        private readonly GeneralService _generalService;

        private Settings _settings;

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

        public async Task RunAsync()
        {
            var nitrogenInputJson = File.ReadAllText("NitrogenInput.json");
            //var nitrogenInputJson = File.ReadAllText("fivefieldsinput.json");
            List<NitrogenInput> nitrogenInputs = JsonConvert.DeserializeObject<List<NitrogenInput>>(nitrogenInputJson);
            
            if (!Directory.Exists(DownloadFolder))
                Directory.CreateDirectory(DownloadFolder);

            
            
            LoadSettings();

            // !! this call is needed the first time an api is called with a fresh clientid and secret !!
            await _farmmapsApiService.GetCurrentUserCodeAsync();
            var roots = await _farmmapsApiService.GetCurrentUserRootsAsync();

            foreach (var input in nitrogenInputs)
            {
                try
                {
                    await Process(roots, input);
                }
                catch (Exception ex)
                {
                    _logger.LogError(ex.Message);
                }
            }
        }

        private async Task Process(List<UserRoot> roots, NitrogenInput input)
        {
            // !!specify if you are using an already created cropfield:
            bool useCreatedCropfield = false;
            var plantingDate = input.PlantingDate;
            var measurementDate = input.MeasurementDate;

            var uploadedRoot = roots.SingleOrDefault(r => r.Name == "Uploaded");
            if (uploadedRoot == null)
            {
                _logger.LogError("Could not find a needed root item");
                return;
            }

            var myDriveRoot = roots.SingleOrDefault(r => r.Name == "My drive");
            if (myDriveRoot == null)
            {
                _logger.LogError("Could not find a needed root item");
                return;
            }

            
            // Use already created cropfield or create new one
            Item cropfieldItem;
            if (useCreatedCropfield == false || string.IsNullOrEmpty(_settings.CropfieldItemCode))
            {
                _logger.LogInformation("Creating cropfield");
                cropfieldItem = await _generalService.CreateCropfieldItemAsync(myDriveRoot.Code,
                    $"VRA NBS cropfield {input.OutputFileName}", plantingDate.Year, input.GeometryJson.ToString(Formatting.None));
                _settings.CropfieldItemCode = cropfieldItem.Code;
                SaveSettings();
            }
            else
            {
                _logger.LogInformation("Cropfield already exists, trying to get it");
                cropfieldItem = await _farmmapsApiService.GetItemAsync(_settings.CropfieldItemCode);
            }



            var geotiffItem = (Item)null;

            // No file input, use most recent satellite image
            if (string.IsNullOrEmpty(input.File))
            {
                _logger.LogInformation("No specific data given, retrieving most recent satellite image");

                // check if satellite task not yet done, do here and save taskcode
                if (useCreatedCropfield == false || string.IsNullOrEmpty(_settings.SatelliteTaskCode))
                {
                    var satelliteTaskCode = await _generalService.RunSatelliteTask(cropfieldItem);
                    _settings.SatelliteTaskCode = satelliteTaskCode;
                    SaveSettings();
                }


                // Select a particular satellite item from satelliteTask
                Item satalliteItem = await _generalService.FindSatelliteItem(cropfieldItem, _settings.SatelliteTaskCode);


                // must be wdvi[1]
                var inputType = (satalliteItem.Data["layers"] as JArray)?[1]["name"].ToString();
                if (string.IsNullOrEmpty(inputType))
                {
                    _logger.LogError("Could not get the input type name from the satellite item");
                    return;
                }

                // download the geotiff
                _logger.LogInformation("Downloading geotiff file");
                await _farmmapsApiService.DownloadItemAsync(satalliteItem.Code,
                    Path.Combine(DownloadFolder, $"nbs_inputSatelliteGeotiff_{input.OutputFileName}.zip"));

                // overwrite measurement date by date of satellite item
                measurementDate = satalliteItem.DataDate.Value;

                geotiffItem = satalliteItem;


            }


       
            // (geo)tiff input:
            else if (input.File.Contains(".tif") || input.File.Contains(".geotiff")) {
                    _logger.LogInformation("input = tiff data");
                    var dataPath = Path.Combine("Data", input.File);
                    geotiffItem = await _generalService.UploadDataAsync(uploadedRoot, GEOTIFF_PROCESSED_ITEMTYPE, dataPath,
                            Path.GetFileNameWithoutExtension(input.File));

                    if (geotiffItem == null) {
                        _logger.LogError("Could not find item for uploaded data");
                        return;
                    } 
                    }
                
            // json/shape input
            else {
                var isGeoJson = input.File.Contains("json");
                var dataPath = Path.Combine("Data", input.File);
                var shapeItem = isGeoJson ?
                    await _generalService.UploadDataAsync(uploadedRoot, SHAPE_PROCESSED_ITEMTYPE, dataPath, Path.GetFileNameWithoutExtension(input.File)) :
                    await _generalService.UploadZipWithShapeAsync(uploadedRoot, dataPath, Path.GetFileNameWithoutExtension(input.File));

                if (shapeItem == null) {
                    _logger.LogError("Could not find item for uploaded data");
                    return;
                }

                _logger.LogInformation($"Converting shape to geotiff");
                geotiffItem = await _generalService.ShapeToGeotiff(shapeItem);
                if (geotiffItem == null) {
                    _logger.LogError("Something went wrong with shape to geotiff transformation");
                    return;
                }

                _logger.LogInformation("Downloading geotiff file");
                await _farmmapsApiService.DownloadItemAsync(geotiffItem.Code,
                    Path.Combine(DownloadFolder, $"{input.OutputFileName}.input_geotiff.zip"));
            }


            




            _logger.LogInformation($"Calculating targetN with targetYield: {input.TargetYield}");
            var targetNItem = await _nitrogenService.CreateTargetNItem(cropfieldItem);
            var targetNData = await _nitrogenService.CalculateTargetN(cropfieldItem, targetNItem, plantingDate,
                measurementDate, input.PotatoPurposeType, input.TargetYield);

            if (targetNData == null)
            {
                _logger.LogError("Something went wrong with TargetN calculation");
                return;
            }
            
            _logger.LogInformation($"TargetN: {targetNData.TargetN}");
            ////Option to manually adjust the Target N, for test purposes only!
            //targetNData.TargetN = 225;
            //_logger.LogInformation($"TargetN adjusted: {targetNData.TargetN}");

            var targetNDataPath = Path.Combine(DownloadFolder, $"{input.OutputFileName}.targetn.json");
            await File.WriteAllTextAsync(targetNDataPath, JsonConvert.SerializeObject(targetNData, Formatting.Indented));

            _logger.LogInformation("Calculating uptake map");
            var uptakeMapItem =
                await _nitrogenService.CalculateUptakeMap(cropfieldItem, geotiffItem, plantingDate,
                    measurementDate, input.InputVariable, input.InputLayerName);
            if (uptakeMapItem == null)
            {
                _logger.LogError("Something went wrong with creating the uptakeMap");
                return;
            }
            
            _logger.LogInformation("Downloading uptake map");
            await _farmmapsApiService.DownloadItemAsync(uptakeMapItem.Code,
                Path.Combine(DownloadFolder, $"{input.OutputFileName}.uptake.zip"));
            _logger.LogInformation("UptakeMap downloaded to {0}", Path.Combine(DownloadFolder, $"{input.OutputFileName}.uptake.zip"));

            _logger.LogInformation("Calculating application map");
            var applicationMapItem =
                await _nitrogenService.CalculateApplicationMap(cropfieldItem, geotiffItem, plantingDate,
                    measurementDate, input.InputVariable, targetNData.TargetN, input.InputLayerName);

            if (applicationMapItem == null)
            {
                _logger.LogError("Something went wrong with creating the applicationMap");
                return;
            }
            _logger.LogInformation("Downloading application map");
            await _farmmapsApiService.DownloadItemAsync(applicationMapItem.Code,
                Path.Combine(DownloadFolder, $"{input.OutputFileName}.application.zip"));
            _logger.LogInformation("Application map can be found in {0}", Path.Combine(DownloadFolder, $"{input.OutputFileName}.application.zip"));

            //transforming tiff to shape
            var tiffItem = applicationMapItem;

            if (tiffItem == null)
            {
                _logger.LogError("Could not find item for uploaded data");
                return;
            }
            _logger.LogInformation($"Converting geotiff to shape");
            var taskmap = await _generalService.GeotiffToShape(tiffItem);
            if (taskmap == null)
            {
                _logger.LogError("Something went wrong with geotiff to shape transformation");
                return;
            }

            _logger.LogInformation("Downloading taskmap");
            await _farmmapsApiService.DownloadItemAsync(taskmap.Code,
                Path.Combine(DownloadFolder, $"{input.OutputFileName}.taskmap.zip"));


        }

        // Functions to save previously created cropfields
        private void LoadSettings()
        {
            if (File.Exists(SettingsFile))
            {
                var jsonText = File.ReadAllText(SettingsFile);
                _settings = JsonConvert.DeserializeObject<Settings>(jsonText);
            }
            else
            {
                _settings = new Settings();
            }
        }

        private void SaveSettings()
        {
            if (_settings == null)
                return;

            var json = JsonConvert.SerializeObject(_settings);
            File.WriteAllText(SettingsFile, json);
        }
    }
}