using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Data.Entity;
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 Resources;

namespace EnVisage.Controllers
{
	[Authorize]
	public class CompanyController : BaseController
	{
		#region Actions

		/// <summary>
		/// GET: /Company/
		/// </summary>
		/// <returns>Parent company view</returns>
		[AreaSecurity(area = Areas.Company, level = AccessLevel.Read)]
		public ActionResult Index()
		{
			if (!SecurityManager.CheckSecurityObjectPermission(Areas.Company, AccessLevel.Read))
				return Redirect("/");

			var model = new CompanyModel();
			try
			{
				var manager = new CompanyManager(DbContext);
				model = manager.LoadParent() ?? new CompanyModel();
			}
			catch (BLLException blEx)
			{
				if (blEx.DisplayError)
					SetErrorScript(message: blEx.Message);
				else
				{
					LogException(blEx);
					SetErrorScript();
				}
			}
			catch (Exception exception)
			{
				LogException(exception);
				SetErrorScript();
			}
			return View(model);
		}

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

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

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

		}

		// GET: /Company/EditParent/5
		[HttpGet]
		[AreaSecurity(area = Areas.Company, level = AccessLevel.Write)]
		public ActionResult EditParent(Guid? id)
		{
			if (id == null)
				return new HttpStatusCodeResult(HttpStatusCode.BadRequest);

			var model = new CompanyModel();
			try
			{
				var manager = new CompanyManager(DbContext);
				model = manager.LoadCompanyModel(id.Value);

				if (model == null || model.Id == Guid.Empty)
					return HttpNotFound();

				// Load company attached users
				model.Watchers = DbContext.User2Company.Where(x => x.CompanyId.Equals(model.Id) && (x.RelationType == CollaborationRole.Watcher)).Select(x => x.UserId).ToList();
				model.Contributors = DbContext.User2Company.Where(x => x.CompanyId.Equals(model.Id) && (x.RelationType == CollaborationRole.Contributor)).Select(x => x.UserId).ToList();
			}
			catch (BLLException blEx)
			{
				if (blEx.DisplayError)
					SetErrorScript(message: blEx.Message);
				else
				{
					LogException(blEx);
					SetErrorScript();
				}
			}
			catch (Exception exception)
			{
				LogException(exception);
				SetErrorScript();
			}
			return View(model);
		}

		// POST: /Company/EditParent/5
		// To protect from overposting attacks, please enable the specific properties you want to bind to, for 
		// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
		[HttpPost]
		[ValidateAntiForgeryToken]
		[AreaSecurity(area = Areas.Company, level = AccessLevel.Write)]
		public ActionResult EditParent(CompanyModel model)
		{
			if (model == null || ContentLocker.IsLock("Company", model.Id.ToString(), User.Identity.GetUserName()))
				return new HttpStatusCodeResult(HttpStatusCode.BadRequest);

			model.TrimStringProperties();

			if (ModelState.IsValid)
			{
				try
				{
					var manager = new CompanyManager(DbContext);
					manager.Save(model);
					DbContext.SaveChanges();
					ContentLocker.RemoveLock("Company", 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: /Company/Edit/5
		[HttpGet]
		[AreaSecurity(area = Areas.Company, level = AccessLevel.Write)]
		public ActionResult Edit(Guid? id)
		{
			var model = new CompanyModel();
			try
			{
				if (id.HasValue)
				{
					var manager = new CompanyManager(DbContext);
					model = manager.LoadWithChildCollections(id.Value) ?? new CompanyModel();

					// Load company attached users
					model.Watchers = DbContext.User2Company.Where(x => x.CompanyId.Equals(model.Id) && (x.RelationType == CollaborationRole.Watcher)).Select(x => x.UserId).ToList();
					model.Contributors = DbContext.User2Company.Where(x => x.CompanyId.Equals(model.Id) && (x.RelationType == CollaborationRole.Contributor)).Select(x => x.UserId).ToList();
				}
			}
			catch (BLLException blEx)
			{
				if (blEx.DisplayError)
					SetErrorScript(message: blEx.Message);
				else
				{
					LogException(blEx);
					SetErrorScript();
				}
			}
			catch (Exception exception)
			{
				LogException(exception);
				SetErrorScript();
			}

			return View(model);
		}

		// POST: /Company/Edit/5
		// To protect from overposting attacks, please enable the specific properties you want to bind to, for 
		// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
		[HttpPost]
		[ValidateAntiForgeryToken]
		[AreaSecurity(area = Areas.Company, level = AccessLevel.Write)]
		public ActionResult Edit(CompanyModel model)
		{
			if (model == null || ContentLocker.IsLock("Company", model.Id.ToString(), User.Identity.GetUserName()))
				return new HttpStatusCodeResult(HttpStatusCode.BadRequest);

			model.TrimStringProperties();

			if (ModelState.IsValid)
			{
				try
				{
					var manager = new CompanyManager(DbContext);
					manager.Save(model);
					DbContext.SaveChanges();
					ContentLocker.RemoveLock("Company", 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: /Company/Delete/5
		[HttpGet]
		[AreaSecurity(area = Areas.Company, level = AccessLevel.Write)]
		public ActionResult Delete(Guid? id)
		{
			if (id == null || id == Guid.Empty)
				return new HttpStatusCodeResult(HttpStatusCode.BadRequest);

			var model = new CompanyModel();
			try
			{
				var manager = new CompanyManager(DbContext);
				model = manager.LoadCompanyModel(id.Value);
				if (model == null)
					return HttpNotFound();
				if (model.ProjectsCount > 0)
					return new HttpStatusCodeResult(HttpStatusCode.BadRequest, Messages.Company_Delete_CompanyHasAssignedProjects_Error);
				if (model.CompaniesCount > 0)
					return new HttpStatusCodeResult(HttpStatusCode.BadRequest, Messages.Company_Delete_CompanyHasChildCompanies_Error);
				if (model.TeamsCount > 0)
					return new HttpStatusCodeResult(HttpStatusCode.BadRequest, Messages.Company_Delete_CompanyHasAssignedTeams_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: /Company/Delete/5
		[HttpPost, ActionName("Delete")]
		[ValidateAntiForgeryToken]
		[AreaSecurity(area = Areas.Company, level = AccessLevel.Write)]
		public ActionResult Delete(CompanyModel model)
		{
			if (ContentLocker.IsLock("Company", model.Id.ToString(), User.Identity.GetUserName()))
				return new HttpStatusCodeResult(HttpStatusCode.BadRequest);

			var manager = new CompanyManager(DbContext);
			var dbObj = manager.Load(model.Id, false);
			if (dbObj == null)
				return HttpNotFound();

			if (dbObj.Projects.Count > 0)
				return new HttpStatusCodeResult(HttpStatusCode.BadRequest, Messages.Company_Delete_CompanyHasAssignedProjects_Error);

			if (dbObj.Company1.Count > 0)
				return new HttpStatusCodeResult(HttpStatusCode.BadRequest, Messages.Company_Delete_CompanyHasChildCompanies_Error);

			if (dbObj.Teams.Count > 0)
				return new HttpStatusCodeResult(HttpStatusCode.BadRequest, Messages.Company_Delete_CompanyHasAssignedTeams_Error);

			// Related Views, Clients & Strategic Goals are deleted via db-cascade delete constraints
			DbContext.Contact2Project.RemoveRange(DbContext.Contact2Project.Where(c2s => c2s.Contact.ParentId == dbObj.Id));
			DbContext.Contacts.RemoveRange(DbContext.Contacts.Where(c => c.ParentId == dbObj.Id));
			DbContext.Companies.Remove(dbObj);
			DbContext.SaveChanges();
			ContentLocker.RemoveLock("Company", dbObj.Id.ToString(), User.Identity.GetUserName());
			return RedirectToAction("Index");
		}

		[AreaSecurity(area = Areas.Company, level = AccessLevel.Write)]
		public ActionResult AddEditCompany(Guid? id)
		{
			var model = new CompanyModel();
			try
			{
				if (id.HasValue)
				{
					var manager = new CompanyManager(DbContext);
					model = manager.LoadWithChildCollections(id.Value) ?? new CompanyModel();

					// Load company attached users
					model.Watchers = DbContext.User2Company.Where(x => x.CompanyId.Equals(model.Id) && x.RelationType == CollaborationRole.Watcher).Select(x => x.UserId).ToList();
					model.Contributors = DbContext.User2Company.Where(x => x.CompanyId.Equals(model.Id) && x.RelationType == CollaborationRole.Contributor).Select(x => x.UserId).ToList();
				}
			}
			catch (BLLException blEx)
			{
				if (blEx.DisplayError)
					SetErrorScript(message: blEx.Message);
				else
				{
					LogException(blEx);
					SetErrorScript();
				}
			}
			catch (Exception exception)
			{
				LogException(exception);
				SetErrorScript();
			}
			return PartialView("_addCompany", model);
		}

		[HttpPost]
		[ValidateJsonAntiForgeryToken]
		public ActionResult LoadCompanies()
		{
			try
			{
				var dictionary = new Dictionary<string, CompanyApiModel>();
				var companies = new CompanyManager(DbContext).LoadCompanies();
				if (companies != null && companies.Any())
				{
					dictionary = companies.Select(x => new CompanyApiModel(x))
						.ToDictionary(x => x.Id.ToString());
				}

				return Json(dictionary);
			}
			catch (Exception exception)
			{
				LogException(exception);
			}

			return new HttpStatusCodeResult(HttpStatusCode.InternalServerError);
		}

		#endregion

		#region Models

		/// <summary>
		/// An UI representation of company to be displayed as list items
		/// </summary>
		public class ListCompany
		{
			public Guid Id { get; set; }
			public string Name { get; set; }
			public int ProjectsCount { get; set; }
			public int CompaniesCount { get; set; }
			public int TeamsCount { get; set; }
			public IList<string> Clients { get; set; }
			public IList<string> Views { get; set; }
		}

		#endregion

		#region Private Methods

		private IList<ListCompany> GetChildCompanies(int startIndex,
			int pageSize,
			ReadOnlyCollection<SortedColumn> sortedColumns,
			out int totalRecordCount,
			out int searchRecordCount,
			string searchString)
		{
			IQueryable<ListCompany> query =
				DbContext.Companies.Include(x => x.Projects)
					.Include(x => x.Company2Client)
					.Include(x => x.Company2View)
					.Include(x => x.Teams)
					.AsNoTracking()
					.Where(c => c.ParentCompanyId != null)
					.Select(c => new ListCompany
					{
						Id = c.Id,
						Name = c.Name,
						ProjectsCount = c.Projects.Count,
						CompaniesCount = c.Company1.Count,
						TeamsCount = c.Teams.Count,
						Clients = c.Company2Client.Select(x => x.Client.Name).ToList(),
						Views = c.Company2View.Select(x => x.View.Name).ToList()
					});

			//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 "ProjectsCount":
						query = sortedColumn.Direction == SortingDirection.Ascending ? query.OrderBy(c => c.ProjectsCount) : query.OrderByDescending(c => c.ProjectsCount);
						break;
					case "TeamsCount":
						query = sortedColumn.Direction == SortingDirection.Ascending ? query.OrderBy(c => c.TeamsCount) : query.OrderByDescending(c => c.TeamsCount);
						break;
					default:
						query = sortedColumn.Direction == SortingDirection.Ascending ? query.OrderBy(c => c.Name) : query.OrderByDescending(c => c.Name);
						break;
				}
			}

			totalRecordCount = DbContext.Companies.Count(c => c.ParentCompanyId != null);
			searchRecordCount = query.Count();
			return query.Skip(startIndex).Take(pageSize).ToList();
		}

		#endregion

	}
}