using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.Caching;
using System.Web;
using System.Web.Mvc;
using DataModel.Helpers;
using DataModel.Process;
using DataModel.ViewModels;
using OfficeOpenXml;
using WebInterface.Helpers;
using WebInterface.Models;

namespace WebInterface.Controllers
{
    /// <summary>
    /// Excel file I/O controller
    /// </summary>
    public class FileIOController : Controller
    {
        /// <summary>
        /// Default content type for spreadsheet
        /// </summary>
        private const string CONTENT_TYPE = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";

        // POST: FileIO/UploadWorkOrders
        [HttpPost]
        public JsonNetResult UploadWorkOrders()
        {
            FileUploadResult<WorkOrderViewModel> result = new FileUploadResult<WorkOrderViewModel>();

            try
            {
                if (Request.Files.Count == 0)
                {
                    throw new Exception("no file uploaded");
                }

                try
                {
                    HttpPostedFileBase postedFile = Request.Files["lotNumberUpload"];
                    using (var package = new ExcelPackage(postedFile.InputStream))
                    {
                        //Get first worksheet
                        ExcelWorksheet worksheet = package.Workbook.Worksheets[1];

                        //Extract data
                        List<long> workOrderNumbers = new List<long>();
                        for (int row = 2; row <= worksheet.Dimension.End.Row; row++)
                        {
                            try
                            {
                                long workOrderNumber = long.Parse(Convert.ToString(worksheet.Cells[row, 1].Value).Trim());
                                workOrderNumbers.Add(workOrderNumber);
                            }
                            catch
                            {
                                //Do nothing
                            }
                        }

                        //Lookup work order data
                        result.Data.AddRange(LotFinderDB.LookupWorkorders(workOrderNumbers)
                                                        .Select(wo => wo.ToViewModel())
                                                        .DistinctBy(wo => new { wo.WorkOrderNumber, wo.ItemNumber })
                                                        .OrderBy(wo => wo.WorkOrderNumber));

                        //Update success flag
                        result.WasSuccessful = true;
                    }
                }
                catch (Exception error)
                {
                    //Forward error with custom message
                    throw new Exception("failed to parse uploaded file", error);
                }
            }
            catch (Exception error)
            {
                //Update result
                result.WasSuccessful = false;
                result.ErrorMessage = error.Message;
            }

            JsonNetResult jsonResult = new JsonNetResult
            {
                Data = result,
                ContentType = HttpContext.Request.AcceptTypes.Contains("application/json") ? "application/json" : "text/plain"
            };

            return jsonResult;
        }

        // POST: FileIO/DownloadWorkOrders
        [HttpPost]
        public ActionResult DownloadWorkOrders(List<long> workOrders)
        {
            //Generate spreadsheet template
            byte[] data = ExcelTemplateGenerator.Generate(workOrders, "Work Order Number");

            //Cache result
            string key = Guid.NewGuid().ToString().ToUpper().Replace("-", "");
            ObjectCache cache = MemoryCache.Default;
            cache.Add(key, data, new CacheItemPolicy() { AbsoluteExpiration = DateTimeOffset.Now.AddMinutes(1) });

            return new JsonNetResult()
            {
                Data = key
            };
        }

        // GET: FileIO/DownloadWorkOrders?key
        public ActionResult DownloadWorkOrders(string key)
        {
            return DownloadFile(key, "work_order_template.xlsx");
        }

        // POST: FileIO/UploadPartNumbers
        [HttpPost]
        public JsonNetResult UploadPartNumbers()
        {
            FileUploadResult<ItemViewModel> result = new FileUploadResult<ItemViewModel>();

            try
            {
                if (Request.Files.Count == 0)
                {
                    throw new Exception("no file uploaded");
                }

                try
                {
                    HttpPostedFileBase postedFile = Request.Files["partNumberUpload"];
                    using (var package = new ExcelPackage(postedFile.InputStream))
                    {
                        //Get first worksheet
                        ExcelWorksheet worksheet = package.Workbook.Worksheets[1];

                        //Extract data
                        List<string> itemNumbers = new List<string>();
                        for (int row = 2; row <= worksheet.Dimension.End.Row; row++)
                        {
                            try
                            {
                                string itemNumber = Convert.ToString(worksheet.Cells[row, 1].Value).Trim();
                                itemNumbers.Add(itemNumber);
                            }
                            catch
                            {
                                //Do nothing
                            }
                        }

                        //Lookup work order data
                        result.Data.AddRange(LotFinderDB.LookupItems(itemNumbers)
                            .Select(i => i.ToViewModel())
                            .DistinctBy(i => new { i.ItemNumber, i.Description }));

                        //Update success flag
                        result.WasSuccessful = true;
                    }
                }
                catch (Exception error)
                {
                    //Forward error with custom message
                    throw new Exception("failed to parse uploaded file", error);
                }
            }
            catch (Exception error)
            {
                //Update result
                result.WasSuccessful = false;
                result.ErrorMessage = error.Message;
            }

            JsonNetResult jsonResult = new JsonNetResult
            {
                Data = result,
                ContentType = HttpContext.Request.AcceptTypes.Contains("application/json") ? "application/json" : "text/plain"
            };

            return jsonResult;
        }

        // POST: FileIO/DownloadPartNumbers
        [HttpPost]
        public ActionResult DownloadPartNumbers(List<ItemViewModel> items)
        {
            if (items == null)
            {
                items = new List<ItemViewModel>();
            }

            //Generate spreadsheet template
            object[][] sourceData = items.Select(po => new object[] { po.ItemNumber }).ToArray();
            string[] headerText = { "Item Number" };
            byte[] data = ExcelTemplateGenerator.Generate(sourceData, headerText);

            //Cache result
            string key = Guid.NewGuid().ToString().ToUpper().Replace("-", "");
            ObjectCache cache = MemoryCache.Default;
            cache.Add(key, data, new CacheItemPolicy() { AbsoluteExpiration = DateTimeOffset.Now.AddMinutes(1) });

            return new JsonNetResult()
            {
                Data = key
            };
        }

        // GET: FileIO/DownloadPartNumbers?key
        public ActionResult DownloadPartNumbers(string key)
        {
            return DownloadFile(key, "item_number_template.xlsx");
        }

        // POST: FileIO/UploadComponentLots
        [HttpPost]
        public JsonNetResult UploadComponentLots()
        {
            FileUploadResult<LotViewModel> result = new FileUploadResult<LotViewModel>();

            try
            {
                if (Request.Files.Count == 0)
                {
                    throw new Exception("no file uploaded");
                }

                try
                {
                    HttpPostedFileBase postedFile = Request.Files["componentLotNumberUpload"];
                    using (var package = new ExcelPackage(postedFile.InputStream))
                    {
                        //Get first worksheet
                        ExcelWorksheet worksheet = package.Workbook.Worksheets[1];

                        //Extract data
                        List<LotViewModel> componentLotNumbers = new List<LotViewModel>();
                        for (int row = 2; row <= worksheet.Dimension.End.Row; row++)
                        {
                            string lotNumber = Convert.ToString(worksheet.Cells[row, 1].Value).Trim();
                            string itemNumber = Convert.ToString(worksheet.Cells[row, 2].Value).Trim();
                            if (!string.IsNullOrEmpty(lotNumber))
                            {
                                componentLotNumbers.Add(new LotViewModel() { LotNumber = lotNumber, ItemNumber = itemNumber });
                            }
                        }

                        //Lookup work order data
                        result.Data.AddRange(LotFinderDB.LookupLots(componentLotNumbers)
                                                        .Select(l => l.ToViewModel())
                                                        .DistinctBy(l => new { l.LotNumber, l.ItemNumber })
                                                        .OrderBy(l => l.LotNumber));

                        //Update success flag
                        result.WasSuccessful = true;
                    }
                }
                catch (Exception error)
                {
                    //Forward error with custom message
                    throw new Exception("failed to parse uploaded file", error);
                }
            }
            catch (Exception error)
            {
                //Update result
                result.WasSuccessful = false;
                result.ErrorMessage = error.Message;
            }

            JsonNetResult jsonResult = new JsonNetResult
            {
                Data = result,
                ContentType = HttpContext.Request.AcceptTypes.Contains("application/json") ? "application/json" : "text/plain"
            };

            return jsonResult;
        }

        // POST: FileIO/DownloadComponentLots
        [HttpPost]
        public ActionResult DownloadComponentLots(List<LotViewModel> lotNumbers)
        {
            if (lotNumbers == null)
            {
                lotNumbers = new List<LotViewModel>();
            }

            //Generate spreadsheet template
            object[][] sourceData = lotNumbers.Select(po => new object[] { po.LotNumber, po.ItemNumber }).ToArray();
            string[] headerText = { "Component Lot Number", "Component Item Number" };
            byte[] data = ExcelTemplateGenerator.Generate(sourceData, headerText);

            //Cache result
            string key = Guid.NewGuid().ToString().ToUpper().Replace("-", "");
            ObjectCache cache = MemoryCache.Default;
            cache.Add(key, data, new CacheItemPolicy() { AbsoluteExpiration = DateTimeOffset.Now.AddMinutes(1) });

            return new JsonNetResult()
            {
                Data = key
            };
        }

        // GET: FileIO/DownloadComponentLots?key
        public ActionResult DownloadComponentLots(string key)
        {
            return DownloadFile(key, "component_lot_template.xlsx");
        }

        // POST: FileIO/UploadPartOperations
        [HttpPost]
        public JsonNetResult UploadPartOperations()
        {
            FileUploadResult<PartOperationViewModel> result = new FileUploadResult<PartOperationViewModel>();

            try
            {
                if (Request.Files.Count == 0)
                {
                    throw new Exception("no file uploaded");
                }

                try
                {
                    HttpPostedFileBase postedFile = Request.Files["partOperationUpload"];
                    using (var package = new ExcelPackage(postedFile.InputStream))
                    {
                        //Get first worksheet
                        ExcelWorksheet worksheet = package.Workbook.Worksheets[1];

                        //Extract data
                        List<PartOperationViewModel> partOperations = new List<PartOperationViewModel>();
                        for (int row = 2; row <= worksheet.Dimension.End.Row; row++)
                        {
                            try
                            {
                                string itemNumber = Convert.ToString(worksheet.Cells[row, 1].Value).Trim();
                                string operationNumber = Convert.ToString(worksheet.Cells[row, 2].Value).Trim();
                                string misNumber = Convert.ToString(worksheet.Cells[row, 3].Value).Trim();
                                string misRevision = Convert.ToString(worksheet.Cells[row, 4].Value).Trim();

                                if (!string.IsNullOrEmpty(operationNumber) && operationNumber.Contains("."))
                                {
                                    //Remove decimal places
                                    operationNumber = operationNumber.Substring(0, operationNumber.IndexOf("."));
                                }

                                if (!string.IsNullOrEmpty(itemNumber) && !string.IsNullOrEmpty(operationNumber))
                                {
                                    partOperations.Add(new PartOperationViewModel()
                                    {
                                        ItemNumber = itemNumber,
                                        OperationNumber = operationNumber,
                                        MisNumber = misNumber,
                                        MisRevision = misRevision
                                    });
                                }
                            }
                            catch (Exception)
                            {
                                //Do nothing
                            }
                        }

                        //Lookup work order data
                        result.Data.AddRange(partOperations);

                        //Update success flag
                        result.WasSuccessful = true;
                    }
                }
                catch (Exception error)
                {
                    //Forward error with custom message
                    throw new Exception("failed to parse uploaded file", error);
                }
            }
            catch (Exception error)
            {
                //Update result
                result.WasSuccessful = false;
                result.ErrorMessage = error.Message;
            }

            JsonNetResult jsonResult = new JsonNetResult
            {
                Data = result,
                ContentType = HttpContext.Request.AcceptTypes.Contains("application/json") ? "application/json" : "text/plain"
            };

            return jsonResult;
        }

        // POST: FileIO/DownloadPartOperations
        [HttpPost]
        public ActionResult DownloadPartOperations(List<PartOperationViewModel> partOperations)
        {
            if (partOperations == null)
            {
                partOperations = new List<PartOperationViewModel>();
            }

            //Generate spreadsheet template
            object[][] sourceData = partOperations.Select(po => new object[] { po.ItemNumber, po.OperationNumber, po.MisNumber, po.MisRevision }).ToArray();
            string[] headerText = { "Item Number", "Operation Number", "MIS Number", "MIS Revision" };
            byte[] data = ExcelTemplateGenerator.Generate(sourceData, headerText);

            //Cache result
            string key = Guid.NewGuid().ToString().ToUpper().Replace("-", "");
            ObjectCache cache = MemoryCache.Default;
            cache.Add(key, data, new CacheItemPolicy() { AbsoluteExpiration = DateTimeOffset.Now.AddMinutes(1) });

            return new JsonNetResult()
            {
                Data = key
            };
        }

        // GET: FileIO/DownloadPartOperations?key
        public ActionResult DownloadPartOperations(string key)
        {
            return DownloadFile(key, "item_operations_mis_template.xlsx");
        }

        // GET: FileIO/DownloadFile?key&fileName
        private ActionResult DownloadFile(string key, string fileName)
        {
            //Try to find data in cache
            ObjectCache cache = MemoryCache.Default;
            byte[] cachedData = cache.Get(key) as byte[];

            if (cachedData == null)
            {
                return HttpNotFound("cached file not found");
            }

            //Clear data from cache
            cache.Remove(key);

            return new FileStreamResult(new MemoryStream(cachedData), CONTENT_TYPE)
            {
                FileDownloadName = fileName
            };
        }
    }
}