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;

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

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

        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");
            List<NitrogenInput> nitrogenInputs = JsonConvert.DeserializeObject<List<NitrogenInput>>(nitrogenInputJson);
            
            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 nitrogenInputs)
            {
                try
                {
                    await Process(roots, input);
                }
                catch (Exception ex)
                {
                    _logger.LogError(ex.Message);
                }
            }
        }

        private async Task Process(List<UserRoot> roots, NitrogenInput input)
        {
            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;
            }

            var cropfieldItem = await _generalService.CreateCropfieldItemAsync(myDriveRoot.Code,
                $"VRA NBS cropfield {input.OutputFileName}", plantingDate.Year, input.GeometryJson.ToString(Formatting.None));

            var dataPath = Path.Combine("Data", input.ZippedShapeFile);
            var shapeItem =
                await _generalService.UploadZipWithShapeAsync(uploadedRoot, dataPath, Path.GetFileNameWithoutExtension(input.ZippedShapeFile));
            if (shapeItem == null)
            {
                _logger.LogError("Could not find shape item");
                return;
            }

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

            _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}");

            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);

            _logger.LogInformation("Downloading uptake map");
            await _farmmapsApiService.DownloadItemAsync(uptakeMapItem.Code,
                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);

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