using System;
using System.Collections.Generic;
using System.Linq;
using System.Web.Mvc;

using BeWoPlanerMobil.Models;
using BeWoPlanerMobil.Service;
using BS.Shared;
using BS.Shared.DataContracts;
using BS.Shared.DataContracts.Compact;

using static BeWoPlanerMobil.Util.MobileUtils;

namespace BeWoPlanerMobil.Controllers
{
    public class CustomerController : AbstractBaseController
    {
        public static string CustomerModelModelSessionKey = "CustomerModelModel";

        private CustomerModel _Model;
        public CustomerModel Model
        {
            get
            {
                if (!MobileSessionFacade.IsUserLoggedIn())
                {
                    RedirectToActionPermanent("Index", "Login");
                    return null;
                }

                if (((CustomerModel) Session[CustomerModelModelSessionKey])?.Employee == null)
                {
                    _Model = new CustomerModel{Employee = MobileSessionFacade.LoggedInEmployee};
                    Session[CustomerModelModelSessionKey] = _Model;
                }
                else
                {
                    _Model = (CustomerModel)Session[CustomerModelModelSessionKey];
                }

                return _Model;
            }
        }

        [Authorize]
        public ActionResult Customer()
        {
            if (!MobileSessionFacade.IsUserLoggedIn() || Request.Browser.Browser.Equals("InternetExplorer"))
            {
                return RedirectToActionPermanent("Index", "Login");
            }

            InitViewModel();

            return View(Model);
        }

        private void InitViewModel()
        {
            var myRelatedCustomers = Model.Employee == null ? new List<CustomerEmployeeRelationDC>() : Model.Employee.RelatedCustomers;

            if (MobileSessionFacade.CheckForUserRight(UserRightType.CustomerView_View))
            {
                Model.Customers = CustomerService.GetAllActiveCompactCustomers().OrderBy(k => k.LastName).ToList();
            }
            else if (MobileSessionFacade.CheckForUserRight(UserRightType.Customer_ViewMyCustomers))
            {
                Model.Customers = CustomerService.GetCompactCustomersById(myRelatedCustomers.Select(c => c.Customer.CustomerOid).ToList()).OrderBy(k => k.LastName).ToList();
            }
            else
            {
                Model.Customers = new List<CompactCustomerDC>();
            }
        }

        [Authorize]
        public ActionResult PreselectCustomer(long? customerOid)
        {
            if (!MobileSessionFacade.IsUserLoggedIn() || Request.Browser.Browser.Equals("InternetExplorer"))
            {
                return RedirectToActionPermanent("Index", "Login");
            }

            InitViewModel();

            if (customerOid.HasValue && customerOid > 0)
            {
                Model.SelectedCustomerOid = customerOid;
                Model.SelectedCustomer = CustomerService.LoadCustomer(customerOid.Value);
            }

            return RedirectToActionPermanent("Customer");
        }

        [Authorize]
        [HttpPost]
        public ActionResult SelectCustomer(FormCollection formCollection)
        {
            try
            {
                if (Model == null)
                {
                    return RedirectToActionPermanent("Index", "Login");
                }

                var selectedCustomerOidString = formCollection["SelectedCustomerOid"];
                if (long.TryParse(selectedCustomerOidString, out var selectedCustomerOid))
                {
                    Model.SelectedCustomerOid = selectedCustomerOid == -1 ? (long?) null : selectedCustomerOid;
                    Model.SelectedCustomer = selectedCustomerOid != -1 ? CustomerService.LoadCustomer(selectedCustomerOid) : null;
                }
                

                return RedirectToActionPermanent("Customer");
            }
            catch (Exception exception)
            {
                Log.Error(exception.Message, exception);
            }

            return RedirectToActionPermanent("Customer");
        }
    }
}