using System;
using System.Linq;
using System.Web.Mvc;
using MileageTraker.Web.DAL;
using MileageTraker.Web.Models;
using MileageTraker.Web.Utility;
using MileageTraker.Web.ViewModels;

namespace MileageTraker.Web.Controllers
{
	public class LogController : ControllerBase
    {
		private readonly DataService _dataService = new DataService();

        public ViewResult Index(LogQueryViewModel query)
        {
			var logs = _dataService.GetLogs();

			var validLogYears = _dataService.GetValidLogYears().ToList();
			if (!validLogYears.Any())
				return View("Empty");
        	if (!query.Year.HasValue)
				query.Year = validLogYears.FirstOrDefault();

			var validLogMonths = _dataService.GetValidLogMonths(query.Year.Value).ToList();
			if (!query.Month.HasValue)
				query.Month = validLogMonths.FirstOrDefault();

        	var filteredLogs = 
				from log in _dataService.GetLogIndexViewModels(DataService.FilterLogs(logs, query))
				orderby log.Created descending 
				select log;
			
        	var viewModel = 
				new LogResultsViewModel
					{
						Logs = filteredLogs, 
						Years = validLogYears,
						Months = validLogMonths,
						SelectedYear = query.Year.Value,
						SelectedMonth = query.Month.Value,
						SelectedLogType = query.LogType.ToString()
					};

			Session.Add("LogPage", Request.Url.PathAndQuery);

			return View(viewModel);
        }

		[ActionLog]
		public ActionResult Export(LogQueryViewModel query)
		{
			var logs = _dataService.GetLogs();
			var name = string.Format(
				"MileageLogs{0}-{1}{2}",
				query.Year,
				query.Month,
				query.LogType.HasValue ? "-" + query.LogType.Value.GetDisplayShortName() : "");

			var export = ExcelWriter.WriteXls(DataService.FilterLogs(logs, query), name, name);
			return File(export, "application/ms-excel", name + ".xls");
		}

		public ViewResult MonthlyVehicleMileage(LogQueryViewModel query)
		{
			var items = _dataService.GetMonthlyVehicleMileageItems(query);

			var report = new VehicleMileageViewModel (items, query);

			return View(report);
		}

		public ActionResult MonthlyEmployeeMileage(LogQueryViewModel query)
		{
			var items = _dataService.GetMonthlyEmployeeMileageItems(query);

			var report = new EmployeeMileageViewModel(items, query);

			return View(report);
		}

		public ViewResult Details(int id)
        {
			var log = _dataService.GetLog(id);
            return View(log);
        }
		
		public ActionResult PreviousDetails(int id)
        {
			var log = _dataService.GetLog(id);
			int logId;
			if (log.VehiclePreviousLog != null)
			{
				logId = log.VehiclePreviousLog.LogId;
			}
			else
			{
				logId = id;
				TempData["Message"] = "This is the first log for this vehicle";
			}
			return RedirectToAction("Details", new {id = logId});
        }

		public ActionResult NextDetails(int id)
		{
			var nextLog = _dataService.GetNextLog(id);
			int logId;
			if (nextLog != null)
			{
				logId = nextLog.LogId;
			}
			else
			{
				logId = id;
				TempData["Message"] = "This is the most recent log for this vehicle";
			}
			return RedirectToAction("Details", new { id = logId });
		}

		public ActionResult Create()
		{
			var log = new Log { Date = DateTime.Today };
			var vehicleId = Request["vehicleId"];

			if (vehicleId != null)
			{
				log.VehicleId = vehicleId;
			}
			return View(log);
		} 

        [HttpPost]
		[ActionLog]
		public ActionResult Create(Log log)
        {
			if (ModelState.IsValid)
			{
				log.Source = HttpContext.Request.Url.AbsolutePath;
				log.UserHostAddress = HttpContext.Request.UserHostAddress;
				log.UserAgent = HttpContext.Request.UserAgent;

				_dataService.AddLog(log);
                return RedirectToAction("Index");  
            }

            return View(log);
        }

		public ActionResult Edit(int id)
        {
			var log = _dataService.GetLog(id);
			return View(log);
        }

		[HttpPost]
		[ActionLog]
		public ActionResult Edit(Log log)
        {
			RemoveModelStateErrors();
        	if (ModelState.IsValid)
            {
				_dataService.UpdateLog(log);
                return RedirectToAction("Details", new{id = log.LogId});
            }
            return View(log);
        }

		private void RemoveModelStateErrors()
    	{
    		ModelState.Remove("Source");
    		ModelState.Remove("UserAgent");
    		ModelState.Remove("UserHostAddress");
			ModelState.Remove("VehiclePreviousLogId");
			ModelState.Remove("VehiclePreviousLog");
    	}

		public ActionResult Delete(int id)
        {
        	var log = _dataService.GetLog(id);
            return View(log);
        }

		[HttpPost, ActionName("Delete")]
		[ActionLog]
		public ActionResult DeleteConfirmed(int id)
        {            
            _dataService.DeleteLog(id);

			if (Session["LogPage"] != null)
				return Redirect((string) Session["LogPage"]);
            return RedirectToAction("Index");
        }

		public JsonResult GetValidLogMonths(int year)
		{
			var validLogMonths = _dataService.GetValidLogMonths(year);
			return Json(validLogMonths, JsonRequestBehavior.AllowGet);
		}

		public PartialViewResult DetailsPartial(int id)
		{
			var log = _dataService.GetLog(id);
			return PartialView(new LogPartialDetails(log));
		}

		protected override void Dispose(bool disposing)
        {
            _dataService.Dispose();
            base.Dispose(disposing);
        }
    }
}