using FreeSql;
using MAX.Core.Cryptography;
using MAX.Core.DependencyInjection;
using StoreHub.Framework.Models;
using StoreHub.Framework.Repositorys;
using StoreHub.Services.Dtos;
using StoreHub.Services.Mappers;

namespace StoreHub.Services;

/// <summary>
/// 用户业务服务：登录校验、用户查询等用例。
/// </summary>
public interface IUserService
{
	/// <summary>
	/// 校验用户名/密码，成功返回用户 DTO，失败返回 null。
	/// </summary>
	Task<UserDto?> LoginAsync(string userName, string password);

	/// <summary>
	/// 根据用户ID获取用户 DTO，不存在返回 null。
	/// </summary>
	Task<UserDto?> GetByIdAsync(int id);
}

/// <summary>
/// 用户业务服务实现（<see cref="IScopedDependency"/>，由 AddStoreHub 自动注册）。
/// </summary>
public class UserService : IUserService, IScopedDependency
{
	private readonly IUserRepository _userRepository;

	public UserService(IUserRepository userRepository)
	{
		_userRepository = userRepository;
	}

	/// <inheritdoc />
	public async Task<UserDto?> LoginAsync(string userName, string password)
	{
		if (string.IsNullOrWhiteSpace(userName) || string.IsNullOrWhiteSpace(password))
		{
			return null;
		}
		var sql = _userRepository.Where(u => u.UserName == userName).ToSql();
		User? user = await _userRepository.Where(u => u.UserName == userName).FirstAsync();
		string pwd = MD5Helper.Md5_32(password);
		if (user is null || !string.Equals(user.Password, pwd, StringComparison.OrdinalIgnoreCase))
		{
			return null;
		}
		
		return UserMapper.ToDto(user);
	}

	/// <inheritdoc />
	public async Task<UserDto?> GetByIdAsync(int id)
	{
		User? user = await _userRepository.Where(u => u.Id == id).FirstAsync();
		return user is null ? null : UserMapper.ToDto(user);
	}
}