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using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Timeline.Entities;
using Timeline.Models.Validation;
namespace Timeline.Services.User
{
public class BasicUserService : IBasicUserService
{
private readonly DatabaseContext _database;
private readonly UsernameValidator _usernameValidator = new UsernameValidator();
public BasicUserService(DatabaseContext database)
{
_database = database;
}
protected static EntityNotExistException CreateUserNotExistException(string username)
{
return new EntityNotExistException(EntityTypes.User,
new Dictionary<string, object> { ["username"] = username });
}
protected static EntityNotExistException CreateUserNotExistException(long id)
{
return new EntityNotExistException(EntityTypes.User,
new Dictionary<string, object> { ["id"] = id });
}
public async Task<bool> CheckUserExistenceAsync(long id)
{
return await _database.Users.AnyAsync(u => u.Id == id);
}
public async Task<long> GetUserIdByUsernameAsync(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 CreateUserNotExistException(username);
return entity.Id;
}
public async Task<DateTime> GetUsernameLastModifiedTimeAsync(long userId)
{
var entity = await _database.Users.Where(u => u.Id == userId).Select(u => new { u.UsernameChangeTime }).SingleOrDefaultAsync();
if (entity is null)
throw CreateUserNotExistException(userId);
return entity.UsernameChangeTime;
}
}
}
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