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

namespace FarmmapsKPI
{
    public class KPIApplication : IApplication
    {
        //private const string DownloadFolder = "Downloads";
        private const string SettingsFile = "settings.json";

        private readonly ILogger<KPIApplication> _logger;
        private readonly FarmmapsApiService _farmmapsApiService;
        private readonly KPIService _dataDownloadService;
        private readonly GeneralService _generalService;

        private Settings _settings;

        public KPIApplication(ILogger<KPIApplication> logger, FarmmapsApiService farmmapsApiService,
            GeneralService generalService, KPIService dataDownloadService)
        {
            _logger = logger;
            _farmmapsApiService = farmmapsApiService;
            _generalService = generalService;
            _dataDownloadService = dataDownloadService;
        }

        public async Task RunAsync()
        {
            var fieldsInputJson = File.ReadAllText("KPIInput.json");

            List<KPIInput> fieldsInputs = JsonConvert.DeserializeObject<List<KPIInput>>(fieldsInputJson);

            // !! 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 fieldsInputs)
            {
                try
                {
                    await Process(roots, input);
                }
                catch (Exception ex)
                {
                    _logger.LogError(ex.Message);
                }
            }
        }

        private async Task Process(List<UserRoot> roots, KPIInput input)
        {
            string downloadFolder = input.DownloadFolder;
            if (string.IsNullOrEmpty(downloadFolder)) {
                downloadFolder = "Downloads";
            }
            if (!Directory.Exists(downloadFolder))
                Directory.CreateDirectory(downloadFolder);

            // !!specify if you are using an already created cropfield:
            bool useCreatedCropfield = input.UseCreatedCropfield;
            var cropYear = input.CropYear;
            var fieldName = input.fieldName;
            //bool storeSatelliteStatistics = input.StoreSatelliteStatisticsSingleImage;
            //bool storeSatelliteStatisticsCropYear = input.StoreSatelliteStatisticsCropYear;
            //List<string> SatelliteBands = new List<string>(1) { input.SatelliteBand };
            //string headerLineStats = $"FieldName,satelliteDate,satelliteBand,max,min,mean,mode,median,stddev,minPlus,curtosis,maxMinus,skewness,variance,populationCount,variationCoefficient,confidenceIntervalLow, confidenceIntervalHigh,confidenceIntervalErrorMargin" + Environment.NewLine;


            string settingsfile = $"Settings_{fieldName}.json";

            LoadSettings(settingsfile);

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

            var myDriveRoot = roots.SingleOrDefault(r => r.Name == "USER_FILES");
            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,
                    $"DataCropfield {input.OutputFileName}", cropYear, input.GeometryJson.ToString(Formatting.None));
                _settings.CropfieldItemCode = cropfieldItem.Code;
                SaveSettings(settingsfile);
            }
            else
            {
                _logger.LogInformation("Cropfield already exists, trying to get it");
                cropfieldItem = await _farmmapsApiService.GetItemAsync(_settings.CropfieldItemCode);
            }

            //Get croprecordings
            if (input.GetCropRecordings)
            {
                var crprecItem = input.CrprecItem;
                _logger.LogInformation($"Trying to get crop recordings of croprecording: {crprecItem}");

                var cropRec = await _farmmapsApiService.GetItemChildrenAsync(crprecItem, CROPREC_ITEMTYPE); 
                if (cropRec == null)
                {
                    _logger.LogError("Something went wrong while obtaining the croprecordings");
                    return;
                }

                var cropRecPath = Path.Combine(downloadFolder, $"croprecordings_{crprecItem}.json");
                _logger.LogInformation($"Found {cropRec.Count} crop recordings");
                var count = 0;
                await Task.Delay(500);
                foreach (var item in cropRec)
                {
                    Console.WriteLine($"Crop recording #{count}: {item.Name}");
                    File.AppendAllText(cropRecPath, item.Data +Environment.NewLine);
                    count++;
                }
                _logger.LogInformation($"Downloaded file {cropRecPath}");
            }
            else
            {
                //todo set croprecordings from file 
            }

            // Get KPI data

            _logger.LogInformation("Calculate KPI map for field");
            var KPIItem = await _generalService.RunKPITask(cropfieldItem);// hier dus verwijzen naar de KPI task 
            if ((object)null == null)
            {
                _logger.LogError("Something went wrong while obtaining the KPI map");
                return;
            }

            //_logger.LogInformation("Downloading KPI map");
            //await _farmmapsApiService.DownloadItemAsync(KPIItem.Code,
            //    Path.Combine(downloadFolder, $"{input.OutputFileName}_KPI.zip"));





        }

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

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

            var json = JsonConvert.SerializeObject(_settings);
            File.WriteAllText(file, json);
        }
        private void SaveInfo(string file)
        {
            if (_settings == null)
                return;

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

        }

    }
}