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 FarmmapsPoten.Models;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using static FarmmapsApiSamples.Constants;


namespace FarmmapsVRApoten
{
    public class PotenApplication : IApplication

    {
        private const string DownloadFolder = "Downloads";

        private readonly ILogger<PotenApplication> _logger;
        private readonly FarmmapsApiService _farmmapsApiService;
        private readonly PotenService _potenService;
        private readonly GeneralService _generalService;


        public PotenApplication(ILogger<PotenApplication> logger, FarmmapsApiService farmmapsApiService,
            GeneralService generalService, PotenService potenService)
        {
            _logger = logger;
            _farmmapsApiService = farmmapsApiService;
            _generalService = generalService;
            _potenService = potenService;
        }

        public async Task RunAsync()
        {
            // read field data from separate json file
            var VRAPotenInputJson = File.ReadAllText("PotenInput.json");
            List<PotenInput> potenInputs = JsonConvert.DeserializeObject<List<PotenInput>>(VRAPotenInputJson);


            if (!Directory.Exists(DownloadFolder))
                Directory.CreateDirectory(DownloadFolder);

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

        private async Task Process(List<UserRoot> roots, PotenInput input)
        {
            var meanDensity = input.MeanDensity;
            var variation = input.Variation;
            var fieldName = input.FieldName;
            bool useShadow = input.UseShadow;

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

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

            _logger.LogInformation("Creating cropfield");

            var cropfieldItem = await _generalService.CreateCropfieldItemAsync(myDrive.Code,
                    $"VRA Poten cropfield {input.OutputFileName}", input.PlantingYear,
                input.GeometryJson.ToString(Formatting.None));

            //Calculating shadow map
            if (useShadow)
            {
                _logger.LogInformation("Calculate shadow map for field");
                var shadowItem = await _generalService.RunShadowTask(cropfieldItem);
                if (shadowItem == null)
                {
                    _logger.LogError("Something went wrong while obtaining the shadow map");
                    return;
                }

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


            _logger.LogInformation("Looking for local data to use");
            var localDataAvailable = input.File;
            var geotiffItem = (Item) null;


            if (String.IsNullOrEmpty(localDataAvailable))
            {
                _logger.LogInformation("Could not find item for uploaded data, using BOFEK");

                //Retreiving BOFEK
                _logger.LogInformation("Get BOFEK for field");
                var bofekItem = await _generalService.RunBofekTask(cropfieldItem);
                if (bofekItem == null)
                {
                    _logger.LogError("Something went wrong while obtaining the BOFEK data");
                    return;
                }

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

            
            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;
                }
            }    

            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("Something went wrong while searching for the shape file");
                    return;
                }

                // transform shape to geotiff as VRA poten only supports tiff input item
                _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, $"VRApoten_inputGeotiff_{input.OutputFileName}.zip"));
            }

            // create appliance map
            _logger.LogInformation("Calculating application map");

            // INPUT IS NEEDED as GEOTIFF
            var applianceMapItem =
                await _potenService.CalculateApplicationMapAsync(cropfieldItem, geotiffItem, meanDensity, variation);

            if (applianceMapItem == null)
            {
                return;
            }

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

            string finalOutput = Path.Combine(DownloadFolder, $"VRApoten_appliancemap_{input.OutputFileName}.zip");
            _logger.LogInformation(File.Exists(finalOutput)
                ? "Download application map completed."
                : "Something went wrong while downloading.");

            _logger.LogInformation($"Converting geotiff to shape");
            var taskmap = await _generalService.GeotiffToShape(applianceMapItem);
            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, $"VRApoten_taskmap_{input.OutputFileName}.zip"));
        }
    }
}