using AutoMapper;
using UserManagement.Application.Dtos.Incomming;
using UserManagement.Application.Dtos.Outgoing;
using UserManagement.Application.Interfaces;
using UserManagement.Domain.Entities;
using UserManagement.Infrastructure.Interfaces;

namespace UserManagement.Application.Services
{
    public class UserService : IUserService
    {
        // CTOR
        private readonly IUserRepository _userRepository;
        private readonly IRoleRepository _roleRepository;
        private readonly IMapper _mapper;
        public UserService(IUserRepository userRepository, IRoleRepository roleRepository, IMapper mapper)
        {
            _userRepository = userRepository;
            _roleRepository = roleRepository;
            _mapper = mapper;
        }

        // CREATE
        public async Task<User?> AddUserAsync(CreatingUserDto creatingUserDto)
        {
            var user = _mapper.Map<User>(creatingUserDto);

            if (!string.IsNullOrEmpty(creatingUserDto.Password))
            {
                user.PasswordHash = BCrypt.Net.BCrypt.HashPassword(creatingUserDto.Password);
            }

            user.UserRoles = new List<UserRole>();

            foreach (var roleId in creatingUserDto.RoleIds)
            {
                var role = await _roleRepository.GetByIdAsync(roleId);
                if (role is not null)
                {
                    user.UserRoles.Add(new UserRole { UserId = user.Id, RoleId = role.Id });
                }
                else
                {
                    throw new ArgumentException($"Role with Id {roleId} not found");
                }
            }

            var created = await _userRepository.AddAsync(user);
            return created;
        }

        // READ ALL
        public async Task<IEnumerable<ReadingUserDto>> GetUsersAsync()
        {
            var users = await _userRepository.GetAllAsync();
            var readDto = _mapper.Map<IEnumerable<ReadingUserDto>>(users);
            return readDto;
        }

        // READ BY ID
        public async Task<ReadingUserDto> GetByIdAsync(int id)
        {
            var user = await _userRepository.GetByIdAsync(id);
            var readDto = _mapper.Map<ReadingUserDto>(user);
            return readDto;
        }

        // READ BY USERNAME
        public async Task<ReadingUserDto> GetByUsernameAsync(string username)
        {
            var user = await _userRepository.GetByUsernameAsync(username);
            var readDto = _mapper.Map<ReadingUserDto>(user);
            return readDto;
        }

        // UPDATE
        public async Task<bool> UpdateUserAsync(UpdatingUserDto updatingUserDto)
        {
            var user = await _userRepository.GetByIdAsync(updatingUserDto.Id);

            if (user is null)
            {
                return false;
            }

            _mapper.Map(updatingUserDto, user);

            if (!string.IsNullOrEmpty(updatingUserDto.Password))
            {
                user.PasswordHash = BCrypt.Net.BCrypt.HashPassword(updatingUserDto.Password);
            }

            user.UserRoles.Clear();

            foreach(var roleId in updatingUserDto.RoleIds)
            {
                var role = await _roleRepository.GetByIdAsync(roleId);
                if (role is not null)
                {
                    user.UserRoles.Add(new UserRole { UserId = user.Id, RoleId = role.Id });
                }
                else
                {
                    throw new ArgumentException($"Role with Id {roleId} not found");
                }
            }

            bool isUpdated = await _userRepository.UpdateAsync(user);
            return isUpdated;
        }

        //// UPDATE USER ROLE -- die Rolle eines Users aktualisieren
        //public async Task UpdateUserRoleAsync(int userId, int roleId)
        //{
        //    var user = await _userRepository.GetByIdAsync(userId);
        //    if (user == null)
        //    {
        //        throw new ArgumentException("User not found");
        //    }

        //    var role = await _roleRepository.GetByIdAsync(roleId);
        //    if (role == null)
        //    {
        //        throw new ArgumentException("Role not found");
        //    }

        //    user.UserRoles = roleId;
        //    await _userRepository.SaveAsync();
        //}

        // DELETE
        public async Task<bool> DeleteUserAsync(int id)
        {
            User? user = await _userRepository.GetByIdAsync(id);

            if (user is null)
                return false;

            bool isDeleted = await _userRepository.DeleteAsync(user);
            return isDeleted;
        }
    }
}