using AutoMapper;
using MagicCarpetContracts.DataModels;
using MagicCarpetContracts.Exceptions;
using MagicCarpetContracts.StoragesContracts;
using MagicCarpetDatabase.Models;
using Microsoft.EntityFrameworkCore;
using Npgsql;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MagicCarpetDatabase.Implementations;

internal class ClientStorageContarct : IClientStorageContract
{
    private readonly MagicCarpetDbContext _dbContext;
    private readonly Mapper _mapper;
    public ClientStorageContarct(MagicCarpetDbContext magicCarpetDbContext)
    {
        _dbContext = magicCarpetDbContext;
        var config = new MapperConfiguration(cfg =>
        {
            cfg.AddMaps(typeof(MagicCarpetDbContext).Assembly);
        });
        _mapper = new Mapper(config);
    }
    public List<ClientDataModel> GetList()
    {
        try
        {
            return [.. _dbContext.Clients.Select(x => _mapper.Map<ClientDataModel>(x))];
        }
        catch (Exception ex)
        {
            _dbContext.ChangeTracker.Clear();
            throw new StorageException(ex);
        }
    }
    public ClientDataModel? GetElementById(string id)
    {
        try
        {
            return _mapper.Map<ClientDataModel>(GetClientById(id));
        }
        catch (Exception ex)
        {
            _dbContext.ChangeTracker.Clear();
            throw new StorageException(ex);
        }
    }
    public ClientDataModel? GetElementByFIO(string fio)
    {
        try
        {
            return _mapper.Map<ClientDataModel>(_dbContext.Clients.FirstOrDefault(x => x.FIO == fio));
        }
        catch (Exception ex)
        {
            _dbContext.ChangeTracker.Clear();
            throw new StorageException(ex);
        }
    }
    public ClientDataModel? GetElementByPhoneNumber(string phoneNumber)
    {
        try
        {
            return _mapper.Map<ClientDataModel>(_dbContext.Clients.FirstOrDefault(x => x.PhoneNumber == phoneNumber));
        }
        catch (Exception ex)
        {
            _dbContext.ChangeTracker.Clear();
            throw new StorageException(ex);
        }
    }
    public void AddElement(ClientDataModel clientDataModel)
    {
        try
        {
            _dbContext.Clients.Add(_mapper.Map<Client>(clientDataModel));
            _dbContext.SaveChanges();
        }
        catch (InvalidOperationException ex) when (ex.TargetSite?.Name == "ThrowIdentityConflict")
        {
            _dbContext.ChangeTracker.Clear();
            throw new ElementExistsException("Id", clientDataModel.Id);
        }
        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Clients_PhoneNumber" })
        {
            _dbContext.ChangeTracker.Clear();
            throw new ElementExistsException("PhoneNumber", clientDataModel.PhoneNumber);
        }
        catch (Exception ex)
        {
            _dbContext.ChangeTracker.Clear();
            throw new StorageException(ex);
        }
    }
    public void UpdElement(ClientDataModel clientDataModel)
    {
        try
        {
            var element = GetClientById(clientDataModel.Id) ?? throw new ElementNotFoundException(clientDataModel.Id);
            _dbContext.Clients.Update(_mapper.Map(clientDataModel, element));
            _dbContext.SaveChanges();
        }
        catch (ElementNotFoundException)
        {
            _dbContext.ChangeTracker.Clear();
            throw;
        }
        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Clients_PhoneNumber" })
        {
            _dbContext.ChangeTracker.Clear();
            throw new ElementExistsException("PhoneNumber", clientDataModel.PhoneNumber);
        }
        catch (Exception ex)
        {
            _dbContext.ChangeTracker.Clear();
            throw new StorageException(ex);
        }
    }
    public void DelElement(string id)
    {
        try
        {
            var element = GetClientById(id) ?? throw new ElementNotFoundException(id);
            _dbContext.Clients.Remove(element);
            _dbContext.SaveChanges();
        }
        catch (ElementNotFoundException)
        {
            _dbContext.ChangeTracker.Clear();
            throw;
        }
        catch (Exception ex)
        {
            _dbContext.ChangeTracker.Clear();
            throw new StorageException(ex);
        }
    }
    private Client? GetClientById(string id) => _dbContext.Clients.FirstOrDefault(x => x.Id == id);
}