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;
            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
            var itemName = "Taskmap";
            var taskMapItem = await FindChildItemAsync(tiffItem.Code,
                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;
        }
    }
}