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using Microsoft.EntityFrameworkCore;
using System;
using System.Linq;
using System.Threading.Tasks;
using Timeline.Entities;
using Timeline.Models.Validation;
using Timeline.Services.Exceptions;
namespace Timeline.Services
{
/// <summary>
/// This service provide some basic user features, which should be used internally for other services.
/// </summary>
public interface IBasicUserService
{
/// <summary>
/// Check if a user exists.
/// </summary>
/// <param name="id">The id of the user.</param>
/// <returns>True if exists. Otherwise false.</returns>
Task<bool> CheckUserExistence(long id);
/// <summary>
/// Get the user id of given username.
/// </summary>
/// <param name="username">Username of the user.</param>
/// <returns>The id of the user.</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="username"/> is null.</exception>
/// <exception cref="ArgumentException">Thrown when <paramref name="username"/> is of bad format.</exception>
/// <exception cref="UserNotExistException">Thrown when the user with given username does not exist.</exception>
Task<long> GetUserIdByUsername(string username);
}
public class BasicUserService : IBasicUserService
{
private readonly DatabaseContext _database;
private readonly UsernameValidator _usernameValidator = new UsernameValidator();
public BasicUserService(DatabaseContext database)
{
_database = database;
}
public async Task<bool> CheckUserExistence(long id)
{
return await _database.Users.AnyAsync(u => u.Id == id);
}
public async Task<long> GetUserIdByUsername(string username)
{
if (username == null)
throw new ArgumentNullException(nameof(username));
if (!_usernameValidator.Validate(username, out var message))
throw new ArgumentException(message);
var entity = await _database.Users.Where(user => user.Username == username).Select(u => new { u.Id }).SingleOrDefaultAsync();
if (entity == null)
throw new UserNotExistException(username);
return entity.Id;
}
}
}
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