using BankContracts.BindingModels;
using BankContracts.SearchModels;
using BankContracts.StoragesContracts;
using BankContracts.ViewModels;
using BankDatabaseImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BankDatabaseImplement.Implements
{
    public class CreditProgramStorage : ICreditProgramStorage
    {
        public CreditProgramViewModel? Delete(CreditProgramBindingModel model)
        {
            using var context = new BankDatabase();
            var element = context.CreditPrograms.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.CreditPrograms.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

        public CreditProgramViewModel? GetElement(CreditProgramSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            using var context = new BankDatabase();
            return context.CreditPrograms
            .FirstOrDefault(x => x.Id == model.Id)
            ?.GetViewModel;
        }

        public List<CreditProgramViewModel> GetFilteredList(CreditProgramSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return new();
            }
            using var context = new BankDatabase();
            return context.CreditPrograms
            .Where(x => x.Id == model.Id)
            .Select(x => x.GetViewModel)
            .ToList();
        }

        public List<CreditProgramViewModel> GetFullList()
        {
            using var context = new BankDatabase();
            return context.CreditPrograms
            .Select(x => x.GetViewModel)
            .ToList();
        }

        public CreditProgramViewModel? Insert(CreditProgramBindingModel model)
        {
            using var context = new BankDatabase();
            var newCreditProgram = CreditProgram.Create(context, model);
            if (newCreditProgram == null)
            {
                return null;
            }
            context.CreditPrograms.Add(newCreditProgram);
            context.SaveChanges();
            return newCreditProgram.GetViewModel;
        }

        public CreditProgramViewModel? Update(CreditProgramBindingModel model)
        {
            using var context = new BankDatabase();
            var creditProgram = context.CreditPrograms.FirstOrDefault(x => x.Id == model.Id);
            if (creditProgram == null)
            {
                return null;
            }
            creditProgram.Update(model);
            creditProgram.UpdateCurrencies(context, model);
            context.SaveChanges();
            return creditProgram.GetViewModel;
        }
    }
}