import 'package:comunic/enums/post_kind.dart';
import 'package:comunic/enums/post_visibility_level.dart';
import 'package:comunic/enums/user_access_levels.dart';
import 'package:comunic/helpers/comments_helper.dart';
import 'package:comunic/lists/comments_list.dart';
import 'package:comunic/lists/posts_list.dart';
import 'package:comunic/models/api_request.dart';
import 'package:comunic/models/post.dart';

/// Posts helper
///
/// @author Pierre HUBERT

const _APIPostsVisibilityLevelMap = {
  "public": PostVisibilityLevel.PUBLIC,
  "friends": PostVisibilityLevel.FRIENDS,
  "private": PostVisibilityLevel.USER,
  "members": PostVisibilityLevel.GROUP_MEMBERS
};

const _APIPostsKindsMap = {
  "text": PostKind.TEXT,
  "image": PostKind.IMAGE,
  "weblink": PostKind.WEB_LINK,
  "pdf": PostKind.PDF,
  "movie": PostKind.MOVIE,
  "countdown": PostKind.COUNTDOWN,
  "survey": PostKind.SURVEY,
  "youtube": PostKind.YOUTUBE
};

const _APIUserAccessMap = {
  "no-access": UserAccessLevels.NONE,
  "basic": UserAccessLevels.BASIC,
  "intermediate": UserAccessLevels.INTERMEDIATE,
  "full": UserAccessLevels.FULL
};

class PostsHelper {
  /// Get the list of latest posts. Return the list of posts or null in case of
  /// failure
  Future<PostsList> getLatest({int from = 0}) async {
    final response = await APIRequest(
      uri: "posts/get_latest",
      needLogin: true,
      args: {
        "include_groups": true.toString(),
        "startFrom": from.toString(),
      }
    ).exec();

    if (response.code != 200) return null;

    try {
      // Parse & return the list of posts
      return PostsList()..addAll(response.getArray().map((f) => _apiToPost(f)));
    } catch (e) {
      print(e.toString());
      return null;
    }
  }

  /// Get the list of posts of a user
  Future<PostsList> getUserPosts(int userID, {int from = 0}) async {
    final response = await APIRequest(
        uri: "posts/get_user",
        needLogin: true,
        args: {
          "userID": userID.toString(),
          "startFrom": from.toString()
        }
    ).exec();

    if (response.code != 200) return null;

    try {
      // Parse & return the list of posts
      return PostsList()..addAll(response.getArray().map((f) => _apiToPost(f)));
    } catch (e) {
      print(e.toString());
      return null;
    }
  }

  /// Update a post content
  Future<bool> updateContent(int id, String newContent) async {
    return (await APIRequest(
      uri: "posts/update_content",
      needLogin: true,
      args: {
        "postID": id.toString(),
        "new_content": newContent,
      },
    ).exec())
        .isOK;
  }

  /// Update a post visibility
  Future<bool> setVisibility(int id, PostVisibilityLevel level) async {
    return (await APIRequest(
      uri: "posts/set_visibility_level",
      needLogin: true,
      args: {
        "postID": id.toString(),
        "new_level": _APIPostsVisibilityLevelMap.map((k, v) => MapEntry(v, k))[level]
      },
    ).exec())
        .isOK;
  }

  /// Delete a post
  Future<bool> delete(int id) async {
    return (await APIRequest(
      uri: "posts/delete",
      needLogin: true,
      args: {"postID": id.toString()},
    ).exec())
        .isOK;
  }

  /// Turn an API entry into a [Post] object
  Post _apiToPost(Map<String, dynamic> map) {
    // Parse comments
    CommentsList comments;
    if (map["comments"] != null) {
      comments = CommentsList();
      map["comments"]
          .forEach((v) => comments.add(CommentsHelper.apiToComment(v)));
    }

    return Post(
      id: map["ID"],
      userID: map["userID"],
      userPageID: map["user_page_id"],
      groupID: map["group_id"],
      timeSent: map["post_time"],
      content: map["content"],
      visibilityLevel: _APIPostsVisibilityLevelMap[map["visibility_level"]],
      kind: _APIPostsKindsMap[map["kind"]],
      fileSize: map["file_size"],
      fileType: map["file_type"],
      filePath: map["file_path"],
      fileURL: map["file_path_url"],
      timeEnd: map["time_end"],
      linkURL: map["link_url"],
      linkTitle: map["link_title"],
      linkDescription: map["link_description"],
      linkImage: map["link_image"],
      likes: map["likes"],
      userLike: map["userlike"],
      access: _APIUserAccessMap[map["user_access"]],
      comments: comments,
    );
  }
}