using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using LawFirmContracts.BindingModels;
using LawFirmContracts.SearchModels;
using LawFirmContracts.StorageContracts;
using LawFirmContracts.ViewModels;
using LawFirmDatabase.Models;

namespace LawFirmDatabase.Implements
{
    public class CustomerStorage : ICustomerStorage
    {
        public List<CustomerViewModel> GetFullList()
        {
            using var context = new LawFirmDBContext();
            return context.Customers
                .Select(x => x.GetViewModel)
                .ToList();
        }
        public List<CustomerViewModel> GetFilteredList(CustomerSearchModel model)
        {
            using var context = new LawFirmDBContext();
            return context.Customers
                .Where(x => x.Id == model.Id)
                .Select(x => x.GetViewModel)
                .ToList();
        }
        public CustomerViewModel? GetElement(CustomerSearchModel model)
        {
            if (model == null)
            {
                return null;
            }
            using var context = new LawFirmDBContext();
            if (model.Id.HasValue)
            {
                return context.Customers.FirstOrDefault(x => x.Id == model.Id)?.GetViewModel;
            }
            else if (!string.IsNullOrEmpty(model.Login) && string.IsNullOrEmpty(model.Password))
            {
                return context.Customers
                    .FirstOrDefault(x => x.Login == model.Login)?.GetViewModel;
            }
            else if (!string.IsNullOrEmpty(model.Login) && !string.IsNullOrEmpty(model.Password))
            {
                return context.Customers
                    .FirstOrDefault(x => x.Login == model.Login && x.Password == model.Password)?.GetViewModel;
            }
            return null;
        }
        public CustomerViewModel? Insert(CustomerBindingModel model)
        {
            using var context = new LawFirmDBContext();
            var newCustomer = Customer.Create(model);
            if (newCustomer != null)
            {
                context.Customers.Add(newCustomer);
                context.SaveChanges();
                return newCustomer.GetViewModel;
            }
            return null;
        }
        public CustomerViewModel? Update(CustomerBindingModel model)
        {
            using var context = new LawFirmDBContext();
            var customer = context.Customers
                .FirstOrDefault(x => x.Id == model.Id);
            if (customer == null)
            {
                return null;
            }
            customer.Update(model);
            context.SaveChanges();
            return customer.GetViewModel;
        }
        public CustomerViewModel? Delete(CustomerBindingModel model)
        {
            using var context = new LawFirmDBContext();
            var customer = context.Customers
                .FirstOrDefault(x => x.Id == model.Id);
            if (customer == null)
            {
                return null;
            }
            context.Customers.Remove(customer);
            context.SaveChanges();
            return customer.GetViewModel;
        }
    }
}