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using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using AutoMapper;
using DevHive.Data.Models;
using DevHive.Services.Models.Comment;
using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using DevHive.Services.Interfaces;
using DevHive.Data.Interfaces.Repositories;
using System.Linq;
namespace DevHive.Services.Services
{
public class CommentService : ICommentService
{
private readonly IUserRepository _userRepository;
private readonly IPostRepository _postRepository;
private readonly ICommentRepository _commentRepository;
private readonly IMapper _postMapper;
public CommentService(IUserRepository userRepository, IPostRepository postRepository, ICommentRepository commentRepository, IMapper postMapper)
{
this._userRepository = userRepository;
this._postRepository = postRepository;
this._commentRepository = commentRepository;
this._postMapper = postMapper;
}
#region Create
public async Task<Guid> AddComment(CreateCommentServiceModel createCommentServiceModel)
{
if (!await this._postRepository.DoesPostExist(createCommentServiceModel.PostId))
throw new ArgumentException("Post does not exist!");
Comment comment = this._postMapper.Map<Comment>(createCommentServiceModel);
comment.TimeCreated = DateTime.Now;
comment.Creator = await this._userRepository.GetByIdAsync(createCommentServiceModel.CreatorId);
comment.Post = await this._postRepository.GetByIdAsync(createCommentServiceModel.PostId);
bool success = await this._commentRepository.AddAsync(comment);
if (success)
{
Comment newComment = await this._commentRepository
.GetCommentByIssuerAndTimeCreatedAsync(comment.Creator.Id, comment.TimeCreated);
return newComment.Id;
}
else
return Guid.Empty;
}
#endregion
#region Read
public async Task<ReadCommentServiceModel> GetCommentById(Guid id)
{
Comment comment = await this._commentRepository.GetByIdAsync(id) ??
throw new ArgumentException("The comment does not exist");
User user = await this._userRepository.GetByIdAsync(comment.Creator.Id) ??
throw new ArgumentException("The user does not exist");
ReadCommentServiceModel readCommentServiceModel = this._postMapper.Map<ReadCommentServiceModel>(comment);
readCommentServiceModel.IssuerFirstName = user.FirstName;
readCommentServiceModel.IssuerLastName = user.LastName;
readCommentServiceModel.IssuerUsername = user.UserName;
return readCommentServiceModel;
}
#endregion
#region Update
public async Task<Guid> UpdateComment(UpdateCommentServiceModel updateCommentServiceModel)
{
if (!await this._commentRepository.DoesCommentExist(updateCommentServiceModel.CommentId))
throw new ArgumentException("Comment does not exist!");
Comment comment = this._postMapper.Map<Comment>(updateCommentServiceModel);
comment.TimeCreated = DateTime.Now;
comment.Creator = await this._userRepository.GetByIdAsync(updateCommentServiceModel.CreatorId);
comment.Post = await this._postRepository.GetByIdAsync(updateCommentServiceModel.PostId);
bool result = await this._commentRepository.EditAsync(updateCommentServiceModel.CommentId, comment);
if (result)
return (await this._commentRepository.GetByIdAsync(updateCommentServiceModel.CommentId)).Id;
else
return Guid.Empty;
}
#endregion
#region Delete
public async Task<bool> DeleteComment(Guid id)
{
if (!await this._commentRepository.DoesCommentExist(id))
throw new ArgumentException("Comment does not exist!");
Comment comment = await this._commentRepository.GetByIdAsync(id);
return await this._commentRepository.DeleteAsync(comment);
}
#endregion
#region Validations
public async Task<bool> ValidateJwtForCreating(Guid userId, string rawTokenData)
{
User user = await this.GetUserForValidation(rawTokenData);
return user.Id == userId;
}
public async Task<bool> ValidateJwtForComment(Guid commentId, string rawTokenData)
{
Comment comment = await this._commentRepository.GetByIdAsync(commentId) ??
throw new ArgumentException("Comment does not exist!");
User user = await this.GetUserForValidation(rawTokenData);
//If user made the comment
if (comment.Creator.Id == user.Id)
return true;
//If user is admin
else if (user.Roles.Any(x => x.Name == Role.AdminRole))
return true;
else
return false;
}
private async Task<User> GetUserForValidation(string rawTokenData)
{
JwtSecurityToken jwt = new JwtSecurityTokenHandler().ReadJwtToken(rawTokenData.Remove(0, 7));
Guid jwtUserId = Guid.Parse(this.GetClaimTypeValues("ID", jwt.Claims).First());
//HashSet<string> jwtRoleNames = this.GetClaimTypeValues("role", jwt.Claims);
User user = await this._userRepository.GetByIdAsync(jwtUserId) ??
throw new ArgumentException("User does not exist!");
return user;
}
private List<string> GetClaimTypeValues(string type, IEnumerable<Claim> claims)
{
List<string> toReturn = new();
foreach (var claim in claims)
if (claim.Type == type)
toReturn.Add(claim.Value);
return toReturn;
}
#endregion
}
}
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