using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Web.Mvc;
using EnVisage.App_Start;
using EnVisage.Code;
using EnVisage.Code.BLL;
using EnVisage.Models;
using jQuery.DataTables.Mvc;
using System.Collections.ObjectModel;
using EnVisage.Code.Validation;
using Resources;

namespace EnVisage.Controllers
{
	[Authorize]
	public class ExpenditureController : BaseController
    {
	    #region Models

	    /// <summary>
		/// An UI representation of expenditures to be displayed as list items
		/// </summary>
		public class ListExpenditure
        {
            public Guid Id { get; set; }
            public string Name { get; set; }
            public int ExpenditureCount { get; set; }
        }

		#endregion

	    #region Actions

	    /// <summary>
		/// GET: /Expenditures/
		/// </summary>
		/// <returns>Empty view</returns>
		[HttpGet]
		[AreaSecurity(area = Areas.Expenditures, level = AccessLevel.Read)]
		public ActionResult Index()
        {
            return View();
        }

        /// <summary>
        /// Returns JSON expenditure list with filters and sort for jQuery DataTables
        /// </summary>
        [HttpPost]
		[AreaSecurity(area = Areas.Expenditures, level = AccessLevel.Read)]
		public JsonResult Index(JQueryDataTablesModel jQueryDataTablesModel)
        {
            int totalRecordCount;
            int searchRecordCount;

            var expenditures = GetExpenditures(startIndex: jQueryDataTablesModel.iDisplayStart,
                pageSize: jQueryDataTablesModel.iDisplayLength, sortedColumns: jQueryDataTablesModel.GetSortedColumns(),
                totalRecordCount: out totalRecordCount, searchRecordCount: out searchRecordCount, searchString: jQueryDataTablesModel.sSearch);

            return this.DataTablesJson(items: expenditures,
                totalRecords: totalRecordCount,
                totalDisplayRecords: searchRecordCount,
                sEcho: jQueryDataTablesModel.sEcho);

        }

        // GET: /Expenditure/Edit/5
		[AreaSecurity(area = Areas.Expenditures, level = AccessLevel.Write)]
		public ActionResult Edit(Guid? id)
        {
			ExpenditureModel model;
			try
			{
				var manager = new ExpenditureManager(DbContext);
				model = (ExpenditureModel)manager.Load(id) ?? new ExpenditureModel();
			}
			catch (BLLException blEx)
			{
				if (blEx.DisplayError)
				{
					//SetErrorScript(message: blEx.Message);
					ModelState.AddModelError(string.Empty, blEx.Message);
					return new FailedJsonResult(ModelState);
				}

				LogException(blEx);
				return new FailedJsonResult();
			}
			catch (Exception exception)
			{
				LogException(exception);
				return new FailedJsonResult();
			}
			return View(model);
        }

        // POST: /Expenditure/Edit/5
        // Чтобы защититься от атак чрезмерной передачи данных, включите определенные свойства, для которых следует установить привязку. Дополнительные 
        // сведения см. в статье http://go.microsoft.com/fwlink/?LinkId=317598.
        [HttpPost]
        [ValidateAntiForgeryToken]
		[AreaSecurity(area = Areas.Expenditures, level = AccessLevel.Write)]
		public ActionResult Edit(ExpenditureModel model)
        {
			if (ContentLocker.IsLock("Expenditure", model.Id.ToString(), User.Identity.GetUserName()))
				return new HttpStatusCodeResult(HttpStatusCode.BadRequest);

			model.TrimStringProperties();

			if (ModelState.IsValid)
			{
				try
				{
					var manager = new ExpenditureManager(DbContext);
					manager.Save(model);
					DbContext.SaveChanges();
					ContentLocker.RemoveLock("Expenditure", model.Id.ToString(), User.Identity.GetUserName());
					return RedirectToAction("Index");
				}
				catch (BLLException blEx) // handle any system specific error
				{
					// display error message if required
					if (blEx.DisplayError)
						ModelState.AddModelError(string.Empty, blEx.Message);
					else // if display not requried then display modal form with general error message 
					{
						LogException(blEx);
						SetErrorScript();
					}
				}
				catch (Exception exception) // handle any unexpected error
				{
					LogException(exception);
					SetErrorScript();
				}
			}
			// return empty model with validation messages (if any) 
			return View(model);
        }

        // GET: /Expenditure/Delete/5
		[AreaSecurity(area = Areas.Expenditures, level = AccessLevel.Write)]
		public ActionResult Delete(Guid? id)
        {
			if (id == null || id == Guid.Empty)
				return new HttpStatusCodeResult(HttpStatusCode.BadRequest);

			var model = new ExpenditureModel();
			try
			{
				var manager = new ExpenditureManager(DbContext);
				model = (ExpenditureModel)manager.Load(id);
				if (model == null)
					return HttpNotFound();
				if (model.CategoriesCount > 0)
					return new HttpStatusCodeResult(HttpStatusCode.BadRequest, Messages.Expenditure_Delete_HasCategoriesAssigned_Error);
			}
			catch (BLLException blEx)
			{
				if (blEx.DisplayError)
					SetErrorScript(message: blEx.Message);
				else
				{
					LogException(blEx);
					SetErrorScript();
				}
			}
			catch (Exception exception)
			{
				LogException(exception);
				SetErrorScript();
			}
			return View(model);
        }

        // POST: /Expenditure/Delete/5
        [HttpPost, ActionName("Delete")]
        [ValidateAntiForgeryToken]
		[AreaSecurity(area = Areas.Expenditures, level = AccessLevel.Write)]
		public ActionResult DeleteConfirmed(ExpenditureModel model)
        {
			if (ContentLocker.IsLock("Expenditure", model.Id.ToString(), User.Identity.GetUserName()))
				return new HttpStatusCodeResult(HttpStatusCode.BadRequest);

			var manager = new ExpenditureManager(DbContext);
			var dbObj = manager.Load(model.Id, false);
			if (dbObj == null)
				return HttpNotFound();
			if (dbObj.ExpenditureCategory.Count > 0)
				return new HttpStatusCodeResult(HttpStatusCode.BadRequest,
												Messages.Expenditure_Delete_HasCategoriesAssigned_Error);
			DbContext.Expenditures.Remove(dbObj);
			DbContext.SaveChanges();
			ContentLocker.RemoveLock("Expenditure", dbObj.Id.ToString(), User.Identity.GetUserName());
			return RedirectToAction("Index");
        }

	    #endregion

		#region Private Methods

		private IList<ListExpenditure> GetExpenditures(int startIndex,
			int pageSize,
			ReadOnlyCollection<SortedColumn> sortedColumns,
			out int totalRecordCount,
			out int searchRecordCount,
			string searchString)
		{
			var query = DbContext.Expenditures.Select(
				c => new ListExpenditure {Id = c.Id, Name = c.Name, ExpenditureCount = c.ExpenditureCategory.Count});

			//filter
			if (!string.IsNullOrWhiteSpace(searchString))
			{
				query = query.Where(c => c.Name.ToLower().Contains(searchString.ToLower()));
			}

			//sort
			foreach (var sortedColumn in sortedColumns)
			{
				switch (sortedColumn.PropertyName)
				{
					case "Id":
						query = sortedColumn.Direction == SortingDirection.Ascending ? query.OrderBy(c => c.Id) : query.OrderByDescending(c => c.Id);
						break;
					case "ExpenditureCount":
						query = sortedColumn.Direction == SortingDirection.Ascending ? query.OrderBy(c => c.ExpenditureCount) : query.OrderByDescending(c => c.ExpenditureCount);
						break;
					default:
						query = sortedColumn.Direction == SortingDirection.Ascending ? query.OrderBy(c => c.Name) : query.OrderByDescending(c => c.Name);
						break;
				}
			}

			totalRecordCount = DbContext.Expenditures.Count();
			searchRecordCount = query.Count();
			var list = query.Skip(startIndex).Take(pageSize).ToList();


			return list;
		}

		#endregion
	}
}