using DeviceContracts.BindingModels;
using DeviceContracts.SearchModels;
using DeviceContracts.StoragesContracts;
using DeviceContracts.ViewModels;
using DeviceDatabaseImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DeviceDatabaseImplement.Implements
{
    public class StaffStorage : IStaffStorage
    {
        public List<StaffViewModel> GetFullList()
        {
            using var context = new DeviceDatabase();
            return context.Staff.Select(x => x.GetViewModel).ToList();
        }

        public List<StaffViewModel> GetFilteredList(StaffSearchModel model)
        {
            if (string.IsNullOrEmpty(model.FullName) &&
                string.IsNullOrEmpty(model.Department) &&
                string.IsNullOrEmpty(model.Email) &&
                model.AccessLevel == 0)
            {
                return new();
            }

            using var context = new DeviceDatabase();
            return context.Staff
                .Where(x => (string.IsNullOrEmpty(model.FullName) ||
                x.FullName == model.FullName) && (string.IsNullOrEmpty(model.Department) ||
                x.Department == model.Department) && (string.IsNullOrEmpty(model.Email) ||
                x.Email == model.Email) && (model.AccessLevel == 0 ||
                x.AccessLevel == model.AccessLevel))
                .Select(x => x.GetViewModel).ToList();
        }

        public StaffViewModel? GetElement(StaffSearchModel model)
        {
            if (string.IsNullOrEmpty(model.FullName) &&
                string.IsNullOrEmpty(model.Department) &&
                string.IsNullOrEmpty(model.Email) &&
                model.AccessLevel == 0)
            {
                return null;
            }

            using var context = new DeviceDatabase();
            return context.Staff
                .FirstOrDefault(x => (string.IsNullOrEmpty(model.FullName) ||
                x.FullName == model.FullName) && (string.IsNullOrEmpty(model.Department) ||
                x.Department == model.Department) && (string.IsNullOrEmpty(model.Email) ||
                x.Email == model.Email) && (model.AccessLevel == 0 ||
                x.AccessLevel == model.AccessLevel))
                ?.GetViewModel;
        }

        public StaffViewModel? Insert(StaffBindingModel model)
        {
            var newStaffMember = Staff.Create(model);
            if (newStaffMember == null)
            {
                return null;
            }

            using var context = new DeviceDatabase();
            context.Staff.Add(newStaffMember);
            context.SaveChanges();
            return newStaffMember.GetViewModel;
        }

        public StaffViewModel? Update(StaffBindingModel model)
        {
            using var context = new DeviceDatabase();
            var staffMember = context.Staff
                .FirstOrDefault(x => x.Id == model.Id);

            if (staffMember == null)
            {
                return null;
            }

            staffMember.Update(model);
            context.SaveChanges();
            return staffMember.GetViewModel;
        }

        public StaffViewModel? Delete(StaffBindingModel model)
        {
            using var context = new DeviceDatabase();
            var staffMember = context.Staff
                .FirstOrDefault(x => x.Id == model.Id);

            if (staffMember != null)
            {
                context.Staff.Remove(staffMember);
                context.SaveChanges();
                return staffMember.GetViewModel;
            }

            return null;
        }
    }
}