package com.openisle.mapper;

import com.openisle.dto.*;
import com.openisle.model.Comment;
import com.openisle.model.Post;
import com.openisle.model.PostRead;
import com.openisle.model.User;
import com.openisle.service.*;
import java.util.stream.Collectors;
import lombok.RequiredArgsConstructor;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.core.Authentication;
import org.springframework.stereotype.Component;

/** Mapper for user related DTOs. */
@Component
@RequiredArgsConstructor
public class UserMapper {

  private final SubscriptionService subscriptionService;
  private final PostService postService;
  private final CommentService commentService;
  private final ReactionService reactionService;
  private final UserVisitService userVisitService;
  private final PostReadService postReadService;
  private final LevelService levelService;
  private final MedalService medalService;
  private final CategoryMapper categoryMapper;
  private final TagMapper tagMapper;

  @Value("${app.snippet-length}")
  private int snippetLength;

  public AuthorDto toAuthorDto(User user) {
    medalService.ensureDisplayMedal(user);
    AuthorDto dto = new AuthorDto();
    dto.setId(user.getId());
    dto.setUsername(user.getUsername());
    dto.setAvatar(user.getAvatar());
    dto.setDisplayMedal(user.getDisplayMedal());
    dto.setBot(user.isBot());
    return dto;
  }

  public UserDto toDto(User user, Authentication viewer) {
    medalService.ensureDisplayMedal(user);
    UserDto dto = new UserDto();
    dto.setId(user.getId());
    dto.setUsername(user.getUsername());
    dto.setEmail(user.getEmail());
    dto.setAvatar(user.getAvatar());
    dto.setRole(user.getRole().name());
    dto.setIntroduction(user.getIntroduction());
    dto.setFollowers(subscriptionService.countSubscribers(user.getUsername()));
    dto.setFollowing(subscriptionService.countSubscribed(user.getUsername()));
    dto.setCreatedAt(user.getCreatedAt());
    dto.setLastPostTime(postService.getLastPostTime(user.getUsername()));
    dto.setLastCommentTime(commentService.getLastCommentTimeOfUserByUserId(user.getId()));
    dto.setTotalViews(postService.getTotalViews(user.getUsername()));
    dto.setVisitedDays(userVisitService.countVisits(user.getUsername()));
    dto.setReadPosts(postReadService.countReads(user.getUsername()));
    dto.setLikesSent(reactionService.countLikesSent(user.getUsername()));
    dto.setLikesReceived(reactionService.countLikesReceived(user.getUsername()));
    dto.setExperience(user.getExperience());
    dto.setPoint(user.getPoint());
    dto.setCurrentLevel(levelService.getLevel(user.getExperience()));
    dto.setNextLevelExp(levelService.nextLevelExp(user.getExperience()));
    dto.setBot(user.isBot());
    if (viewer != null) {
      dto.setSubscribed(subscriptionService.isSubscribed(viewer.getName(), user.getUsername()));
    } else {
      dto.setSubscribed(false);
    }
    return dto;
  }

  public UserDto toDto(User user) {
    return toDto(user, null);
  }

  public PostMetaDto toMetaDto(Post post) {
    PostMetaDto dto = new PostMetaDto();
    dto.setId(post.getId());
    dto.setTitle(post.getTitle());
    String content = post.getContent();
    if (content == null) {
      content = "";
    }
    if (snippetLength >= 0) {
      dto.setSnippet(
        content.length() > snippetLength ? content.substring(0, snippetLength) : content
      );
    } else {
      dto.setSnippet(content);
    }
    dto.setCreatedAt(post.getCreatedAt());
    dto.setCategory(categoryMapper.toDto(post.getCategory()));
    dto.setTags(post.getTags().stream().map(tagMapper::toDto).collect(Collectors.toList()));
    dto.setViews(post.getViews());
    dto.setCommentCount(post.getCommentCount());
    return dto;
  }

  public CommentInfoDto toCommentInfoDto(Comment comment) {
    CommentInfoDto dto = new CommentInfoDto();
    dto.setId(comment.getId());
    dto.setContent(comment.getContent());
    dto.setCreatedAt(comment.getCreatedAt());
    dto.setPost(toMetaDto(comment.getPost()));
    if (comment.getParent() != null) {
      ParentCommentDto pc = new ParentCommentDto();
      pc.setId(comment.getParent().getId());
      pc.setAuthor(comment.getParent().getAuthor().getUsername());
      pc.setContent(comment.getParent().getContent());
      dto.setParentComment(pc);
    }
    return dto;
  }

  public PostReadDto toPostReadDto(PostRead read) {
    PostReadDto dto = new PostReadDto();
    dto.setPost(toMetaDto(read.getPost()));
    dto.setLastReadAt(read.getLastReadAt());
    return dto;
  }
}