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

namespace FarmmapsApi.Services
{
    public class GeneralService {
        private readonly ILogger<GeneralService> _logger;
        private readonly FarmmapsApiService _farmmapsApiService;

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

        public async Task<Item> CreateCropfieldItemAsync(string parentItemCode, string name, int year,
            string fieldGeomJson, string data = "{}") {
            var currentYear = new DateTime(year, 1, 1);
            var cropfieldItemRequest = new ItemRequest() {
                ParentCode = parentItemCode,
                ItemType = CROPFIELD_ITEMTYPE,
                Name = name,
                DataDate = currentYear,
                DataEndDate = currentYear.AddYears(1).AddDays(-1),
                Data = JObject.Parse(data),
                Geometry = JObject.Parse(fieldGeomJson)
            };

            return await _farmmapsApiService.CreateItemAsync(cropfieldItemRequest);
        }

        public async Task<Item> UploadDataAsync(UserRoot root, string itemType, string filePath, string itemName) {
            var startUpload = DateTime.UtcNow.AddSeconds(-3);
            var result = await _farmmapsApiService.UploadFile(filePath, root.Code,
                progress => _logger.LogInformation($"Status: {progress.Status} - BytesSent: {progress.BytesSent}"));

            if (result.Progress.Status == UploadStatus.Failed)
                return null;

            return await FindChildItemAsync(root.Code, itemType, itemName,
                i => i.Created >= startUpload &&
                     i.Name.ToLower().Contains(itemName.ToLower()));
        }

        public async Task<Item> UploadZipWithShapeAsync(UserRoot root, string filePath, string itemName) {
            var startUpload = DateTime.UtcNow;
            var result = await _farmmapsApiService.UploadFile(filePath, root.Code,
                progress => _logger.LogInformation($"Status: {progress.Status} - BytesSent: {progress.BytesSent}"));

            if (result.Progress.Status == UploadStatus.Failed)
                return null;

            return await FindChildItemAsync(root.Code, SHAPE_PROCESSED_ITEMTYPE, itemName,
                i => i.Created >= startUpload &&
                     i.Name.ToLower().Contains(itemName.ToLower())); ;
        }

        public async Task<Item> ShapeToGeotiff(Item shapeItem) {
            await RunAndWaitForTask(shapeItem, "vnd.farmmaps.task.shapetogeotiff");

            // the parent of the shape item is now the tiff item
            shapeItem = await _farmmapsApiService.GetItemAsync(shapeItem.Code);
            return await _farmmapsApiService.GetItemAsync(shapeItem.ParentCode);
        }


        public async Task<Item> GeotiffToShape(Item tiffItem) {
            var taskmapRequest = new TaskRequest { TaskType = TASKMAP_TASK };

            string itemTaskCode = await _farmmapsApiService.QueueTaskAsync(tiffItem.Code, taskmapRequest);

            await PollTask(TimeSpan.FromSeconds(5), async (tokenSource) => {
                var itemTaskStatus = await _farmmapsApiService.GetTaskStatusAsync(tiffItem.Code, itemTaskCode);
                _logger.LogInformation($"Waiting on converting geotiff to shape; status: {itemTaskStatus.State}");
                if (itemTaskStatus.IsFinished)
                    tokenSource.Cancel();
            });

            var itemTask = await _farmmapsApiService.GetTaskStatusAsync(tiffItem.Code, itemTaskCode);
            if (itemTask.State == ItemTaskState.Error) {
                _logger.LogError($"Something went wrong with task execution: {itemTask.Message}");
                return null;
            }

            //the taskmap is a child of the input tiff *** Update feb 2021: it is a child of the cropfield. 
            var itemName = "Taskmap";
            var taskMapItem = await FindChildItemAsync(tiffItem.ParentCode,
                SHAPE_PROCESSED_ITEMTYPE, itemName);
            if (taskMapItem == null) {
                _logger.LogError("Could not find the shape taskmap as a child item under the input");
                return null;
            }

            return taskMapItem;
        }


        public async Task<ItemTaskStatus> RunAndWaitForTask(Item subjectItem, string taskIdentifier,
            Action<TaskRequest> configureCallback = null, int retrySeconds = 3) {
            var taskRequest = new TaskRequest() {
                TaskType = taskIdentifier
            };
            configureCallback?.Invoke(taskRequest);

            var taskCode = await _farmmapsApiService.QueueTaskAsync(subjectItem.Code, taskRequest);

            await PollTask(TimeSpan.FromSeconds(retrySeconds), async (tokenSource) => {
                _logger.LogInformation($"Checking {taskIdentifier} task status");
                var itemTaskStatus = await _farmmapsApiService.GetTaskStatusAsync(subjectItem.Code, taskCode);
                if (itemTaskStatus.IsFinished)
                    tokenSource.Cancel();
            });

            _logger.LogInformation($"{taskIdentifier} finished");

            return await _farmmapsApiService.GetTaskStatusAsync(subjectItem.Code, taskCode);
        }

        public async Task<Item> FindChildItemAsync(string parentCode, string itemType, string containsName,
            Func<Item, bool> filter = null, int maxTries = 10) {
            Item dataItem = null;
            int tries = 0;
            await PollTask(TimeSpan.FromSeconds(3), async source => {
                _logger.LogInformation($"Trying to get {containsName} data");
                var uploadedFilesChildren = await _farmmapsApiService.GetItemChildrenAsync(parentCode, itemType);
                Func<Item, bool> func = filter ?? (i => i.Name.ToLower().Contains(containsName.ToLower()));
                dataItem = uploadedFilesChildren.FirstOrDefault(func);
                if (dataItem != null || tries == maxTries) {
                    source.Cancel();
                }

                tries++;
            });

            if (dataItem == null) {
                _logger.LogError("dataItem not found");
                return null;
            }

            _logger.LogInformation($"Found {containsName} item");
            return dataItem;
        }

        public async Task<Item> RunBofekTask(Item cropfieldItem) {
            var taskmapRequest = new TaskRequest { TaskType = BOFEK_TASK };

            string itemTaskCode = await _farmmapsApiService.QueueTaskAsync(cropfieldItem.Code, taskmapRequest);

            await PollTask(TimeSpan.FromSeconds(5), async (tokenSource) => {
                var itemTaskStatus = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
                _logger.LogInformation($"Waiting on retreiving BOFEK data; 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;
            }

            //the BOFEK data is a child of the cropfield
            var itemName = "bofek";
            var bofekItem = await FindChildItemAsync(cropfieldItem.Code,
                SHAPE_PROCESSED_ITEMTYPE, itemName);
            if (bofekItem == null) {
                _logger.LogError("Could not find the BOFEK data as a child item under the cropfield");
                return null;
            }

            return bofekItem;
        }

        public async Task<Item> RunAhnTask(Item cropfieldItem) {
            var taskmapRequest = new TaskRequest { TaskType = AHN_TASK };

            string itemTaskCode = await _farmmapsApiService.QueueTaskAsync(cropfieldItem.Code, taskmapRequest);

            await PollTask(TimeSpan.FromSeconds(5), async (tokenSource) => {
                var itemTaskStatus = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
                _logger.LogInformation($"Waiting on retreiving AHN data; 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;
            }

            //the AHN data is a child of the cropfield
            var itemName = "ahn";
            var ahnItem = await FindChildItemAsync(cropfieldItem.Code,
                GEOTIFF_PROCESSED_ITEMTYPE, itemName);
            if (ahnItem == null) {
                _logger.LogError("Could not find the AHN data as a child item under the cropfield");
                return null;
            }

            return ahnItem;
        }

        public async Task<Item> RunShadowTask(Item cropfieldItem) {
            var taskmapRequest = new TaskRequest { TaskType = SHADOW_TASK };

            string itemTaskCode = await _farmmapsApiService.QueueTaskAsync(cropfieldItem.Code, taskmapRequest);

            await PollTask(TimeSpan.FromSeconds(5), async (tokenSource) => {
                var itemTaskStatus = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
                _logger.LogInformation($"Waiting on calculation shadow data; 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;
            }

            //the shadow data is a child of the cropfield
            var itemName = "shadow";
            var shadowItem = await FindChildItemAsync(cropfieldItem.Code,
                GEOTIFF_PROCESSED_ITEMTYPE, itemName);
            if (shadowItem == null) {
                _logger.LogError("Could not find the shadow data as a child item under the cropfield");
                return null;
            }

            return shadowItem;
        }


        public async Task<string> RunSatelliteTask(Item cropfieldItem) {

            _logger.LogInformation("Gathering satellite information for cropfield, this might take a while!");

            var taskmapRequest = new TaskRequest { TaskType = SATELLITE_TASK };
            string itemTaskCode = await _farmmapsApiService.QueueTaskAsync(cropfieldItem.Code, taskmapRequest);

            await PollTask(TimeSpan.FromSeconds(5), async (tokenSource) => {
                var itemTaskStatus = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
                _logger.LogInformation($"Waiting on satellite data; 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 when trying to process satellite data; {itemTask.Message}");

            }

            return itemTask.Code;
        }


        public async Task<Item> FindSatelliteItem(Item cropfieldItem, string satelliteTaskCode, string FieldName, bool StoreStatistics) {

            var taskStatus = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, satelliteTaskCode);


            // find ndvi or wdvi satellite data geotiffs
            var temporalItem = await FindChildItemAsync(cropfieldItem.Code, TEMPORAL_ITEMTYPE,
                "Cropfield Satellite items", item => item.SourceTask == SATELLITE_TASK &&
                                                                 taskStatus.Finished >= item.Created &&
                                                                 taskStatus.Finished <= item.Created.Value.AddHours(1));


            if (temporalItem == null) {
                _logger.LogError("Temporal item not found");

            }

            var satelliteTiffs = await _farmmapsApiService.GetItemChildrenAsync(temporalItem.Code);

            _logger.LogInformation("Available satellite images:");
            var count = 0;
            TimeSpan.FromSeconds(0.5);
            foreach (var item in satelliteTiffs) {

                Console.WriteLine($"Satellite image #{count}: {item.DataDate}");
                count++;
            }

            _logger.LogInformation("Enter satellite image number for NBS application");
            int elment = Int32.Parse(Console.ReadLine());

            var selectedSatelliteItem = satelliteTiffs[elment];

            if (selectedSatelliteItem == null) {
                _logger.LogError("Satellite item not found");

            }

            return selectedSatelliteItem;





        }

        //VanDerSat
        public async Task<string> RunVanDerSatTask(Item cropfieldItem) {

            _logger.LogInformation("Gathering VanDerSat information for cropfield, this might take a while!");

            var taskmapRequest = new TaskRequest { TaskType = VANDERSAT_TASK };
            string itemTaskCode = await _farmmapsApiService.QueueTaskAsync(cropfieldItem.Code, taskmapRequest);

            await PollTask(TimeSpan.FromSeconds(5), async (tokenSource) => {
                var itemTaskStatus = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
                _logger.LogInformation($"Waiting on VanDerSat data; 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 when trying to process VanDerSat data; {itemTask.Message}");

            }

            return itemTask.Code;
        }

        public async Task<string> RunWatBalTask(Item cropfieldItem) {

            _logger.LogInformation("Gathering WatBal information for cropfield, this might take a while!");

            var taskmapRequest = new TaskRequest { TaskType = WATBAL_TASK };
            string itemTaskCode = await _farmmapsApiService.QueueTaskAsync(cropfieldItem.Code, taskmapRequest);

            await PollTask(TimeSpan.FromSeconds(5), async (tokenSource) => {
                var itemTaskStatus = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, itemTaskCode);
                _logger.LogInformation($"Waiting on VanDerSat data; 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 when trying to process WatBal data; {itemTask.Message}");

            }

            return itemTask.Code;
        }

        public async Task<Item> FindVanDerSatItem(Item cropfieldItem, string VanDerSatTaskCode, string FieldName, bool StoreStatistics) {

            var taskStatus = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, VanDerSatTaskCode);


            // find VanDerSat data temporal 
            var temporalItem = await FindChildItemAsync(cropfieldItem.Code, TEMPORAL_ITEMTYPE, "Van der Sat");


            if (temporalItem == null) {
                _logger.LogError("Temporal item not found");

            }

            var VanDerSatiffs = await _farmmapsApiService.GetItemChildrenAsync(temporalItem.Code);

            _logger.LogInformation("Available VanDerSat images:");
            var count = 0;
            TimeSpan.FromSeconds(0.5);
            foreach (var item in VanDerSatiffs) {

                //Console.WriteLine($"Van der Sat image #{count}: {item.DataDate}");
                //if (count == 0 ) {
                //    Console.WriteLine($"vandersat image #{count}: {item.Data}");
                //}

                if (StoreStatistics == true) {
                    var VanDerSatBand = item.Data["layers"][0]["name"];
                    var VanderSatFile = $"C:\\Akkerweb\\{FieldName}_{VanDerSatBand}.csv";
                    var NewLineField = $"Field,Date,Mean,Min,Max,Standard deviation, ConfidenceInterval low, ConfidenceInterval high" + Environment.NewLine;
                    if (count == 0) {
                        File.AppendAllText(VanderSatFile, NewLineField);
                        var numbervandersat = VanDerSatiffs.Count;
                        Console.WriteLine($"{numbervandersat} Van der Sat images found");
                    }


                    var VanderSatStatistics = item.Data["layers"][0]["renderer"]["band"]["statistics"];
                    var VanDerSatImageDate = (DateTime)item.DataDate;
                    var VanderSatDate = VanDerSatImageDate.ToString("yyyy-MM-dd");
                    var NewLineDate = $"\"date\":{VanderSatDate}" + Environment.NewLine;
                    if (VanderSatStatistics == null) {
                        Console.WriteLine($"{VanderSatDate} no statistics found");
                        //Console.WriteLine($"Available data: {item.Data}");
                    } else {
                        File.AppendAllText(VanderSatFile, $"{FieldName},{VanderSatDate},{VanderSatStatistics["mean"]},{VanderSatStatistics["min"]},{VanderSatStatistics["max"]},{VanderSatStatistics["stddev"]},{VanderSatStatistics["confidenceIntervalLow"]},{VanderSatStatistics["confidenceIntervalHigh"]}" + Environment.NewLine);
                    }


                }

                count++;
            }
            //_logger.LogInformation("Enter VanDerSat image number");
            //int element = Int32.Parse(Console.ReadLine());
            int element = 0;
            var selectedVanDerSatItem = VanDerSatiffs[element];

            if (selectedVanDerSatItem == null) {
                _logger.LogError("VanDerSat item not found");

            }

            return selectedVanDerSatItem;





        }

        public async Task<Item> FindWatBalItem(Item cropfieldItem, string WatBalTaskCode, string FieldName, bool StoreStatistics) {

            var taskStatus = await _farmmapsApiService.GetTaskStatusAsync(cropfieldItem.Code, WatBalTaskCode);


            // find WatBal data temporal 
            var temporalItem = await FindChildItemAsync(cropfieldItem.Code, TEMPORAL_ITEMTYPE, "WatBal");//, item => item.SourceTask == VANDERSAT_TASK &&
                                                                                                         //                                           taskStatus.Finished >= item.Created &&
                                                                                                         //                                         taskStatus.Finished <= item.Created.Value.AddHours(1));


            if (temporalItem == null) {
                _logger.LogError("Temporal item not found");

            }

            var WatBalData = await _farmmapsApiService.GetItemChildrenAsync(temporalItem.Code);

            _logger.LogInformation("Available WatBal Data:");
            var count = 0;
            TimeSpan.FromSeconds(0.5);
            foreach (var item in WatBalData) {

                Console.WriteLine($"WatBal data #{count}: {item.DataDate}");
                if (count == 0) {
                    Console.WriteLine($"WatBalData #{count}: {item.Data}");
                }

                count++;
            }

            int element = 0;
            var selectedWatBalItem = WatBalData[element];

            if (selectedWatBalItem == null) {
                _logger.LogError("WatBal item not found");

            }

            return selectedWatBalItem;
        }
    }
}