using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web.Mvc;
using MileageTraker.Web.DAL;
using MileageTraker.Web.Models;
using MileageTraker.Web.Utility;
using MileageTraker.Web.ViewModels.FuelLog;

namespace MileageTraker.Web.Controllers
{
	[Authorize(Roles = "Administrator, Developer")]
	public class FuelLogController : ControllerBase
    {
		public ViewResult Index(FuelLogQueryViewModel query)
		{
			var validLogYearMonths = DataService.GetValidFuelLogMonths();

			if (!validLogYearMonths.Any()) // this means no logs in DB
				return View("Empty");

			// default parameter processing
			if (!query.HasParameters())
			{
				query.Year = validLogYearMonths.First().Year;
				query.Month = validLogYearMonths.First().Month;
			}
			if (query.Year.HasValue && !query.Month.HasValue)
			{
				var validLogMonths = validLogYearMonths.Where(dt => dt.Year == query.Year).ToList();
				query.Month = validLogMonths.Min(dt => dt.Month);
			}

			var fuelLogs = DataService.GetFuelLogs();
			//fuelLogs.OrderBy(f => f.FuelLogId);

			//var filteredLogs =
			//	(from log in DataService.GetFuelLogIndexViewModels(DataService.FilterLogs(fuelLogs, query))
			//	 orderby log. descending
			//	 select log).ToList();

			var viewModel = new FuelLogResultsViewModel(fuelLogs, query, CustomExtensions.YearMonthList(validLogYearMonths));

			//Session.Add("FuelLogPage", Request.Url.PathAndQuery);

			return View(viewModel);
		}

		#region Import

		public ActionResult ImportUpload()
		{
			return View();
		}

		[HttpPost]
		public ActionResult Import(FuelLogImportUploadViewModel viewModel)
		{
			if (ModelState.IsValid && viewModel.File != null && viewModel.File.ContentLength > 0)
			{
				var fileName = Path.GetFileName(viewModel.File.FileName);
				var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName);
				var fileInfo = new FileInfo(path);
				viewModel.File.SaveAs(path);

				try
				{
					var logImports = FuelmanCsvImporter.Import(fileInfo);
					// todo: add to the database
					DataService.AddFuelLogs(logImports);
					// todo: delete file?
					return View(logImports.ToList());
				}
					//catch (OutOfMemoryException)
					//{
					//	TempData["StatusMessage"] = "Problem reading excel document - please verify that the document is in Excel 97-2003 Workbook (.xls) format";
					//	TempData["StatusMessage-Type"] = "alert-error";
					//}
				catch (Exception ex)
				{
					TempData["StatusMessage"] = "Problem reading document: " + ex.Message;
					TempData["StatusMessage-Type"] = "alert-error";
				}
				finally
				{
					if (fileInfo.Exists) 
						fileInfo.Delete();
				}
			}
			return RedirectToAction("ImportUpload");
		}
		#endregion
	}
}