using AutoMapper;
using CandyHouseBase.DataModels;
using CandyHouseBase.Exceptions;
using CandyHouseBase.Interfaces.StoragesContracts;
using CandyHouseDataBase.Models;
using Microsoft.EntityFrameworkCore;
using Npgsql;
using System.Collections.Generic;

namespace CandyHouseDataBase.Implementations;

internal class OrderStorageContract : IOrderStorageContact
{
    private readonly CandyHouseDbContext _dbContext;
    private readonly Mapper _mapper;

    public OrderStorageContract(CandyHouseDbContext dbContext)
    {
        _dbContext = dbContext ?? throw new ArgumentNullException(nameof(dbContext));
        var config = new MapperConfiguration(cfg =>
        {
            cfg.CreateMap<Order, OrderDataModel>()
                .ForMember(dest => dest.Id, opt => opt.MapFrom(src => src.Id))
                .ForMember(dest => dest.CustomerName, opt => opt.MapFrom(src => src.CustomerName))
                .ForMember(dest => dest.OrderDate, opt => opt.MapFrom(src => src.OrderDate))
                .ForMember(dest => dest.TotalAmount, opt => opt.MapFrom(src => src.TotalAmount))
                .ForMember(dest => dest.DiscountAmount, opt => opt.MapFrom(src => src.DiscountAmount))
                .ForMember(dest => dest.ProductId, opt => opt.MapFrom(src => src.ProductId))
                .ForMember(dest => dest.PekarId, opt => opt.MapFrom(src => src.PekarId))
                .ForMember(dest => dest.StatusType, opt => opt.MapFrom(src => src.StatusType));
            cfg.CreateMap<OrderDataModel, Order>()
                .ForMember(dest => dest.Id, opt => opt.MapFrom(src => src.Id))
                .ForMember(dest => dest.CustomerName, opt => opt.MapFrom(src => src.CustomerName))
                .ForMember(dest => dest.OrderDate, opt => opt.MapFrom(src => src.OrderDate))
                .ForMember(dest => dest.TotalAmount, opt => opt.MapFrom(src => src.TotalAmount))
                .ForMember(dest => dest.DiscountAmount, opt => opt.MapFrom(src => src.DiscountAmount))
                .ForMember(dest => dest.ProductId, opt => opt.MapFrom(src => src.ProductId))
                .ForMember(dest => dest.PekarId, opt => opt.MapFrom(src => src.PekarId))
                .ForMember(dest => dest.StatusType, opt => opt.MapFrom(src => src.StatusType));
        });
        _mapper = new Mapper(config);
    }

    public List<OrderDataModel> GetOrders()
    {
        try
        {
            return _dbContext.Orders
                .Select(x => _mapper.Map<OrderDataModel>(x))
                .ToList();
        }
        catch (Exception ex)
        {
            _dbContext.ChangeTracker.Clear();
            throw new StorageException(ex);
        }
    }

    public void AddElement(OrderDataModel order)
    {
        try
        {
            order.Validate();
            var entity = _mapper.Map<Order>(order);
            _dbContext.Orders.Add(entity);
            _dbContext.SaveChanges();
        }
        catch (ValidationException ex)
        {
            _dbContext.ChangeTracker.Clear();
            throw;
        }
        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Orders_PekarId_OrderDate" })
        {
            _dbContext.ChangeTracker.Clear();
            throw new ElementExistsException("OrderDate", order.OrderDate.ToString());
        }
        catch (Exception ex)
        {
            _dbContext.ChangeTracker.Clear();
            throw new StorageException(ex);
        }
    }

    public void UpdateElement(OrderDataModel order)
    {
        try
        {
            order.Validate();
            var entity = GetOrderById(order.Id) ?? throw new ElementNotFoundException(order.Id);
            _dbContext.Orders.Update(_mapper.Map(order, entity));
            _dbContext.SaveChanges();
        }
        catch (ValidationException ex)
        {
            _dbContext.ChangeTracker.Clear();
            throw;
        }
        catch (ElementNotFoundException)
        {
            _dbContext.ChangeTracker.Clear();
            throw;
        }
        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Orders_PekarId_OrderDate" })
        {
            _dbContext.ChangeTracker.Clear();
            throw new ElementExistsException("OrderDate", order.OrderDate.ToString());
        }
        catch (Exception ex)
        {
            _dbContext.ChangeTracker.Clear();
            throw new StorageException(ex);
        }
    }

    public void DeleteElement(OrderDataModel order)
    {
        try
        {
            var entity = GetOrderById(order.Id) ?? throw new ElementNotFoundException(order.Id);
            _dbContext.Orders.Remove(entity);
            _dbContext.SaveChanges();
        }
        catch (ElementNotFoundException)
        {
            _dbContext.ChangeTracker.Clear();
            throw;
        }
        catch (Exception ex)
        {
            _dbContext.ChangeTracker.Clear();
            throw new StorageException(ex);
        }
    }

    public OrderDataModel GetElementById(string orderId)
    {
        try
        {
            var entity = GetOrderById(orderId) ?? throw new ElementNotFoundException(orderId);
            return _mapper.Map<OrderDataModel>(entity);
        }
        catch (Exception ex)
        {
            _dbContext.ChangeTracker.Clear();
            throw new StorageException(ex);
        }
    }

    private Order? GetOrderById(string id) =>
        _dbContext.Orders.FirstOrDefault(x => x.Id == id);
}